includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 $page = null;
 125                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 126                         return $page;
 127                 }
 128
 129                 switch ( $ns ) {
 130                         case NS_FILE:
 131                                 $page = new WikiFilePage( $title );
 132                                 break;
 133                         case NS_CATEGORY:
 134                                 $page = new WikiCategoryPage( $title );
 135                                 break;
 136                         default:
 137                                 $page = new WikiPage( $title );
 138                 }
 139
 140                 return $page;
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          *
 146          * @param int $id Article ID to load
 147          * @param string|int $from One of the following values:
 148          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 150          *
 151          * @return WikiPage|null
 152          */
 153         public static function newFromID( $id, $from = 'fromdb' ) {
 154                 // page id's are never 0 or negative, see bug 61166
 155                 if ( $id < 1 ) {
 156                         return null;
 157                 }
 158
 159                 $from = self::convertSelectType( $from );
 160                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 161                 $row = $db->selectRow(
 162                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 163                 if ( !$row ) {
 164                         return null;
 165                 }
 166                 return self::newFromRow( $row, $from );
 167         }
 168
 169         /**
 170          * Constructor from a database row
 171          *
 172          * @since 1.20
 173          * @param object $row Database row containing at least fields returned by selectFields().
 174          * @param string|int $from Source of $data:
 175          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 176          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 177          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 178          * @return WikiPage
 179          */
 180         public static function newFromRow( $row, $from = 'fromdb' ) {
 181                 $page = self::factory( Title::newFromRow( $row ) );
 182                 $page->loadFromRow( $row, $from );
 183                 return $page;
 184         }
 185
 186         /**
 187          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 188          *
 189          * @param object|string|int $type
 190          * @return mixed
 191          */
 192         private static function convertSelectType( $type ) {
 193                 switch ( $type ) {
 194                 case 'fromdb':
 195                         return self::READ_NORMAL;
 196                 case 'fromdbmaster':
 197                         return self::READ_LATEST;
 198                 case 'forupdate':
 199                         return self::READ_LOCKING;
 200                 default:
 201                         // It may already be an integer or whatever else
 202                         return $type;
 203                 }
 204         }
 205
 206         /**
 207          * @todo Move this UI stuff somewhere else
 208          *
 209          * @see ContentHandler::getActionOverrides
 210          */
 211         public function getActionOverrides() {
 212                 return $this->getContentHandler()->getActionOverrides();
 213         }
 214
 215         /**
 216          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 217          *
 218          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 219          *
 220          * @return ContentHandler
 221          *
 222          * @since 1.21
 223          */
 224         public function getContentHandler() {
 225                 return ContentHandler::getForModelID( $this->getContentModel() );
 226         }
 227
 228         /**
 229          * Get the title object of the article
 230          * @return Title Title object of this page
 231          */
 232         public function getTitle() {
 233                 return $this->mTitle;
 234         }
 235
 236         /**
 237          * Clear the object
 238          * @return void
 239          */
 240         public function clear() {
 241                 $this->mDataLoaded = false;
 242                 $this->mDataLoadedFrom = self::READ_NONE;
 243
 244                 $this->clearCacheFields();
 245         }
 246
 247         /**
 248          * Clear the object cache fields
 249          * @return void
 250          */
 251         protected function clearCacheFields() {
 252                 $this->mId = null;
 253                 $this->mRedirectTarget = null; // Title object if set
 254                 $this->mLastRevision = null; // Latest revision
 255                 $this->mTouched = '19700101000000';
 256                 $this->mLinksUpdated = '19700101000000';
 257                 $this->mTimestamp = '';
 258                 $this->mIsRedirect = false;
 259                 $this->mLatest = false;
 260                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 261                 // the requested rev ID and content against the cached one for equality. For most
 262                 // content types, the output should not change during the lifetime of this cache.
 263                 // Clearing it can cause extra parses on edit for no reason.
 264         }
 265
 266         /**
 267          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 268          * @return void
 269          * @since 1.23
 270          */
 271         public function clearPreparedEdit() {
 272                 $this->mPreparedEdit = false;
 273         }
 274
 275         /**
 276          * Return the list of revision fields that should be selected to create
 277          * a new page.
 278          *
 279          * @return array
 280          */
 281         public static function selectFields() {
 282                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 283
 284                 $fields = [
 285                         'page_id',
 286                         'page_namespace',
 287                         'page_title',
 288                         'page_restrictions',
 289                         'page_is_redirect',
 290                         'page_is_new',
 291                         'page_random',
 292                         'page_touched',
 293                         'page_links_updated',
 294                         'page_latest',
 295                         'page_len',
 296                 ];
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 if ( $wgPageLanguageUseDB ) {
 303                         $fields[] = 'page_lang';
 304                 }
 305
 306                 return $fields;
 307         }
 308
 309         /**
 310          * Fetch a page record with the given conditions
 311          * @param IDatabase $dbr
 312          * @param array $conditions
 313          * @param array $options
 314          * @return object|bool Database result resource, or false on failure
 315          */
 316         protected function pageData( $dbr, $conditions, $options = [] ) {
 317                 $fields = self::selectFields();
 318
 319                 // Avoid PHP 7.1 warning of passing $this by reference
 320                 $wikiPage = $this;
 321
 322                 Hooks::run( 'ArticlePageDataBefore', [ &$wikiPage, &$fields ] );
 323
 324                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 325
 326                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 327
 328                 return $row;
 329         }
 330
 331         /**
 332          * Fetch a page record matching the Title object's namespace and title
 333          * using a sanitized title string
 334          *
 335          * @param IDatabase $dbr
 336          * @param Title $title
 337          * @param array $options
 338          * @return object|bool Database result resource, or false on failure
 339          */
 340         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 341                 return $this->pageData( $dbr, [
 342                         'page_namespace' => $title->getNamespace(),
 343                         'page_title' => $title->getDBkey() ], $options );
 344         }
 345
 346         /**
 347          * Fetch a page record matching the requested ID
 348          *
 349          * @param IDatabase $dbr
 350          * @param int $id
 351          * @param array $options
 352          * @return object|bool Database result resource, or false on failure
 353          */
 354         public function pageDataFromId( $dbr, $id, $options = [] ) {
 355                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 356         }
 357
 358         /**
 359          * Load the object from a given source by title
 360          *
 361          * @param object|string|int $from One of the following:
 362          *   - A DB query result object.
 363          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 364          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 365          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 366          *     using SELECT FOR UPDATE.
 367          *
 368          * @return void
 369          */
 370         public function loadPageData( $from = 'fromdb' ) {
 371                 $from = self::convertSelectType( $from );
 372                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 373                         // We already have the data from the correct location, no need to load it twice.
 374                         return;
 375                 }
 376
 377                 if ( is_int( $from ) ) {
 378                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 379                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 380
 381                         if ( !$data
 382                                 && $index == DB_REPLICA
 383                                 && wfGetLB()->getServerCount() > 1
 384                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 385                         ) {
 386                                 $from = self::READ_LATEST;
 387                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 388                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 389                         }
 390                 } else {
 391                         // No idea from where the caller got this data, assume replica DB.
 392                         $data = $from;
 393                         $from = self::READ_NORMAL;
 394                 }
 395
 396                 $this->loadFromRow( $data, $from );
 397         }
 398
 399         /**
 400          * Load the object from a database row
 401          *
 402          * @since 1.20
 403          * @param object|bool $data DB row containing fields returned by selectFields() or false
 404          * @param string|int $from One of the following:
 405          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 406          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 407          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 408          *          the master DB using SELECT FOR UPDATE
 409          */
 410         public function loadFromRow( $data, $from ) {
 411                 $lc = LinkCache::singleton();
 412                 $lc->clearLink( $this->mTitle );
 413
 414                 if ( $data ) {
 415                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 416
 417                         $this->mTitle->loadFromRow( $data );
 418
 419                         // Old-fashioned restrictions
 420                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 421
 422                         $this->mId = intval( $data->page_id );
 423                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 424                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 425                         $this->mIsRedirect = intval( $data->page_is_redirect );
 426                         $this->mLatest = intval( $data->page_latest );
 427                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 428                         // Double-check the ID of any cached latest Revision object for consistency.
 429                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 430                                 $this->mLastRevision = null;
 431                                 $this->mTimestamp = '';
 432                         }
 433                 } else {
 434                         $lc->addBadLinkObj( $this->mTitle );
 435
 436                         $this->mTitle->loadFromRow( false );
 437
 438                         $this->clearCacheFields();
 439
 440                         $this->mId = 0;
 441                 }
 442
 443                 $this->mDataLoaded = true;
 444                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 445         }
 446
 447         /**
 448          * @return int Page ID
 449          */
 450         public function getId() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454                 return $this->mId;
 455         }
 456
 457         /**
 458          * @return bool Whether or not the page exists in the database
 459          */
 460         public function exists() {
 461                 if ( !$this->mDataLoaded ) {
 462                         $this->loadPageData();
 463                 }
 464                 return $this->mId > 0;
 465         }
 466
 467         /**
 468          * Check if this page is something we're going to be showing
 469          * some sort of sensible content for. If we return false, page
 470          * views (plain action=view) will return an HTTP 404 response,
 471          * so spiders and robots can know they're following a bad link.
 472          *
 473          * @return bool
 474          */
 475         public function hasViewableContent() {
 476                 return $this->mTitle->isKnown();
 477         }
 478
 479         /**
 480          * Tests if the article content represents a redirect
 481          *
 482          * @return bool
 483          */
 484         public function isRedirect() {
 485                 if ( !$this->mDataLoaded ) {
 486                         $this->loadPageData();
 487                 }
 488
 489                 return (bool)$this->mIsRedirect;
 490         }
 491
 492         /**
 493          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 494          *
 495          * Will use the revisions actual content model if the page exists,
 496          * and the page's default if the page doesn't exist yet.
 497          *
 498          * @return string
 499          *
 500          * @since 1.21
 501          */
 502         public function getContentModel() {
 503                 if ( $this->exists() ) {
 504                         $cache = ObjectCache::getMainWANInstance();
 505
 506                         return $cache->getWithSetCallback(
 507                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 508                                 $cache::TTL_MONTH,
 509                                 function () {
 510                                         $rev = $this->getRevision();
 511                                         if ( $rev ) {
 512                                                 // Look at the revision's actual content model
 513                                                 return $rev->getContentModel();
 514                                         } else {
 515                                                 $title = $this->mTitle->getPrefixedDBkey();
 516                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 517                                                 return $this->mTitle->getContentModel();
 518                                         }
 519                                 }
 520                         );
 521                 }
 522
 523                 // use the default model for this page
 524                 return $this->mTitle->getContentModel();
 525         }
 526
 527         /**
 528          * Loads page_touched and returns a value indicating if it should be used
 529          * @return bool True if this page exists and is not a redirect
 530          */
 531         public function checkTouched() {
 532                 if ( !$this->mDataLoaded ) {
 533                         $this->loadPageData();
 534                 }
 535                 return ( $this->mId && !$this->mIsRedirect );
 536         }
 537
 538         /**
 539          * Get the page_touched field
 540          * @return string Containing GMT timestamp
 541          */
 542         public function getTouched() {
 543                 if ( !$this->mDataLoaded ) {
 544                         $this->loadPageData();
 545                 }
 546                 return $this->mTouched;
 547         }
 548
 549         /**
 550          * Get the page_links_updated field
 551          * @return string|null Containing GMT timestamp
 552          */
 553         public function getLinksTimestamp() {
 554                 if ( !$this->mDataLoaded ) {
 555                         $this->loadPageData();
 556                 }
 557                 return $this->mLinksUpdated;
 558         }
 559
 560         /**
 561          * Get the page_latest field
 562          * @return int The rev_id of current revision
 563          */
 564         public function getLatest() {
 565                 if ( !$this->mDataLoaded ) {
 566                         $this->loadPageData();
 567                 }
 568                 return (int)$this->mLatest;
 569         }
 570
 571         /**
 572          * Get the Revision object of the oldest revision
 573          * @return Revision|null
 574          */
 575         public function getOldestRevision() {
 576
 577                 // Try using the replica DB first, then try the master
 578                 $continue = 2;
 579                 $db = wfGetDB( DB_REPLICA );
 580                 $revSelectFields = Revision::selectFields();
 581
 582                 $row = null;
 583                 while ( $continue ) {
 584                         $row = $db->selectRow(
 585                                 [ 'revision' ],
 586                                 $revSelectFields,
 587                                 [
 588                                         'rev_page' => $this->getId()
 589                                 ],
 590                                 __METHOD__,
 591                                 [
 592                                         'ORDER BY' => 'rev_timestamp ASC'
 593                                 ]
 594                         );
 595
 596                         if ( $row ) {
 597                                 $continue = 0;
 598                         } else {
 599                                 $db = wfGetDB( DB_MASTER );
 600                                 $continue--;
 601                         }
 602                 }
 603
 604                 return $row ? Revision::newFromRow( $row ) : null;
 605         }
 606
 607         /**
 608          * Loads everything except the text
 609          * This isn't necessary for all uses, so it's only done if needed.
 610          */
 611         protected function loadLastEdit() {
 612                 if ( $this->mLastRevision !== null ) {
 613                         return; // already loaded
 614                 }
 615
 616                 $latest = $this->getLatest();
 617                 if ( !$latest ) {
 618                         return; // page doesn't exist or is missing page_latest info
 619                 }
 620
 621                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 622                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 623                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 624                         // transactions, where S1 normally only sees changes committed before the first S1
 625                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 626                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 627                         // happened after the first S1 SELECT.
 628                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 629                         $flags = Revision::READ_LOCKING;
 630                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 631                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 632                         // Bug T93976: if page_latest was loaded from the master, fetch the
 633                         // revision from there as well, as it may not exist yet on a replica DB.
 634                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 635                         $flags = Revision::READ_LATEST;
 636                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 637                 } else {
 638                         $dbr = wfGetDB( DB_REPLICA );
 639                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 640                 }
 641
 642                 if ( $revision ) { // sanity
 643                         $this->setLastEdit( $revision );
 644                 }
 645         }
 646
 647         /**
 648          * Set the latest revision
 649          * @param Revision $revision
 650          */
 651         protected function setLastEdit( Revision $revision ) {
 652                 $this->mLastRevision = $revision;
 653                 $this->mTimestamp = $revision->getTimestamp();
 654         }
 655
 656         /**
 657          * Get the latest revision
 658          * @return Revision|null
 659          */
 660         public function getRevision() {
 661                 $this->loadLastEdit();
 662                 if ( $this->mLastRevision ) {
 663                         return $this->mLastRevision;
 664                 }
 665                 return null;
 666         }
 667
 668         /**
 669          * Get the content of the current revision. No side-effects...
 670          *
 671          * @param int $audience One of:
 672          *   Revision::FOR_PUBLIC       to be displayed to all users
 673          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 674          *   Revision::RAW              get the text regardless of permissions
 675          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 676          *   to the $audience parameter
 677          * @return Content|null The content of the current revision
 678          *
 679          * @since 1.21
 680          */
 681         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 682                 $this->loadLastEdit();
 683                 if ( $this->mLastRevision ) {
 684                         return $this->mLastRevision->getContent( $audience, $user );
 685                 }
 686                 return null;
 687         }
 688
 689         /**
 690          * @return string MW timestamp of last article revision
 691          */
 692         public function getTimestamp() {
 693                 // Check if the field has been filled by WikiPage::setTimestamp()
 694                 if ( !$this->mTimestamp ) {
 695                         $this->loadLastEdit();
 696                 }
 697
 698                 return wfTimestamp( TS_MW, $this->mTimestamp );
 699         }
 700
 701         /**
 702          * Set the page timestamp (use only to avoid DB queries)
 703          * @param string $ts MW timestamp of last article revision
 704          * @return void
 705          */
 706         public function setTimestamp( $ts ) {
 707                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 708         }
 709
 710         /**
 711          * @param int $audience One of:
 712          *   Revision::FOR_PUBLIC       to be displayed to all users
 713          *   Revision::FOR_THIS_USER    to be displayed to the given user
 714          *   Revision::RAW              get the text regardless of permissions
 715          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 716          *   to the $audience parameter
 717          * @return int User ID for the user that made the last article revision
 718          */
 719         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 720                 $this->loadLastEdit();
 721                 if ( $this->mLastRevision ) {
 722                         return $this->mLastRevision->getUser( $audience, $user );
 723                 } else {
 724                         return -1;
 725                 }
 726         }
 727
 728         /**
 729          * Get the User object of the user who created the page
 730          * @param int $audience One of:
 731          *   Revision::FOR_PUBLIC       to be displayed to all users
 732          *   Revision::FOR_THIS_USER    to be displayed to the given user
 733          *   Revision::RAW              get the text regardless of permissions
 734          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 735          *   to the $audience parameter
 736          * @return User|null
 737          */
 738         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 739                 $revision = $this->getOldestRevision();
 740                 if ( $revision ) {
 741                         $userName = $revision->getUserText( $audience, $user );
 742                         return User::newFromName( $userName, false );
 743                 } else {
 744                         return null;
 745                 }
 746         }
 747
 748         /**
 749          * @param int $audience One of:
 750          *   Revision::FOR_PUBLIC       to be displayed to all users
 751          *   Revision::FOR_THIS_USER    to be displayed to the given user
 752          *   Revision::RAW              get the text regardless of permissions
 753          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 754          *   to the $audience parameter
 755          * @return string Username of the user that made the last article revision
 756          */
 757         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 758                 $this->loadLastEdit();
 759                 if ( $this->mLastRevision ) {
 760                         return $this->mLastRevision->getUserText( $audience, $user );
 761                 } else {
 762                         return '';
 763                 }
 764         }
 765
 766         /**
 767          * @param int $audience One of:
 768          *   Revision::FOR_PUBLIC       to be displayed to all users
 769          *   Revision::FOR_THIS_USER    to be displayed to the given user
 770          *   Revision::RAW              get the text regardless of permissions
 771          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 772          *   to the $audience parameter
 773          * @return string Comment stored for the last article revision
 774          */
 775         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 776                 $this->loadLastEdit();
 777                 if ( $this->mLastRevision ) {
 778                         return $this->mLastRevision->getComment( $audience, $user );
 779                 } else {
 780                         return '';
 781                 }
 782         }
 783
 784         /**
 785          * Returns true if last revision was marked as "minor edit"
 786          *
 787          * @return bool Minor edit indicator for the last article revision.
 788          */
 789         public function getMinorEdit() {
 790                 $this->loadLastEdit();
 791                 if ( $this->mLastRevision ) {
 792                         return $this->mLastRevision->isMinor();
 793                 } else {
 794                         return false;
 795                 }
 796         }
 797
 798         /**
 799          * Determine whether a page would be suitable for being counted as an
 800          * article in the site_stats table based on the title & its content
 801          *
 802          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 803          *   if false, the current database state will be used
 804          * @return bool
 805          */
 806         public function isCountable( $editInfo = false ) {
 807                 global $wgArticleCountMethod;
 808
 809                 if ( !$this->mTitle->isContentPage() ) {
 810                         return false;
 811                 }
 812
 813                 if ( $editInfo ) {
 814                         $content = $editInfo->pstContent;
 815                 } else {
 816                         $content = $this->getContent();
 817                 }
 818
 819                 if ( !$content || $content->isRedirect() ) {
 820                         return false;
 821                 }
 822
 823                 $hasLinks = null;
 824
 825                 if ( $wgArticleCountMethod === 'link' ) {
 826                         // nasty special case to avoid re-parsing to detect links
 827
 828                         if ( $editInfo ) {
 829                                 // ParserOutput::getLinks() is a 2D array of page links, so
 830                                 // to be really correct we would need to recurse in the array
 831                                 // but the main array should only have items in it if there are
 832                                 // links.
 833                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 834                         } else {
 835                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 836                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 837                         }
 838                 }
 839
 840                 return $content->isCountable( $hasLinks );
 841         }
 842
 843         /**
 844          * If this page is a redirect, get its target
 845          *
 846          * The target will be fetched from the redirect table if possible.
 847          * If this page doesn't have an entry there, call insertRedirect()
 848          * @return Title|null Title object, or null if this page is not a redirect
 849          */
 850         public function getRedirectTarget() {
 851                 if ( !$this->mTitle->isRedirect() ) {
 852                         return null;
 853                 }
 854
 855                 if ( $this->mRedirectTarget !== null ) {
 856                         return $this->mRedirectTarget;
 857                 }
 858
 859                 // Query the redirect table
 860                 $dbr = wfGetDB( DB_REPLICA );
 861                 $row = $dbr->selectRow( 'redirect',
 862                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 863                         [ 'rd_from' => $this->getId() ],
 864                         __METHOD__
 865                 );
 866
 867                 // rd_fragment and rd_interwiki were added later, populate them if empty
 868                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 869                         $this->mRedirectTarget = Title::makeTitle(
 870                                 $row->rd_namespace, $row->rd_title,
 871                                 $row->rd_fragment, $row->rd_interwiki
 872                         );
 873                         return $this->mRedirectTarget;
 874                 }
 875
 876                 // This page doesn't have an entry in the redirect table
 877                 $this->mRedirectTarget = $this->insertRedirect();
 878                 return $this->mRedirectTarget;
 879         }
 880
 881         /**
 882          * Insert an entry for this page into the redirect table if the content is a redirect
 883          *
 884          * The database update will be deferred via DeferredUpdates
 885          *
 886          * Don't call this function directly unless you know what you're doing.
 887          * @return Title|null Title object or null if not a redirect
 888          */
 889         public function insertRedirect() {
 890                 $content = $this->getContent();
 891                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 892                 if ( !$retval ) {
 893                         return null;
 894                 }
 895
 896                 // Update the DB post-send if the page has not cached since now
 897                 $that = $this;
 898                 $latest = $this->getLatest();
 899                 DeferredUpdates::addCallableUpdate(
 900                         function () use ( $that, $retval, $latest ) {
 901                                 $that->insertRedirectEntry( $retval, $latest );
 902                         },
 903                         DeferredUpdates::POSTSEND,
 904                         wfGetDB( DB_MASTER )
 905                 );
 906
 907                 return $retval;
 908         }
 909
 910         /**
 911          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 912          * @param Title $rt Redirect target
 913          * @param int|null $oldLatest Prior page_latest for check and set
 914          */
 915         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 916                 $dbw = wfGetDB( DB_MASTER );
 917                 $dbw->startAtomic( __METHOD__ );
 918
 919                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 920                         $dbw->upsert(
 921                                 'redirect',
 922                                 [
 923                                         'rd_from' => $this->getId(),
 924                                         'rd_namespace' => $rt->getNamespace(),
 925                                         'rd_title' => $rt->getDBkey(),
 926                                         'rd_fragment' => $rt->getFragment(),
 927                                         'rd_interwiki' => $rt->getInterwiki(),
 928                                 ],
 929                                 [ 'rd_from' ],
 930                                 [
 931                                         'rd_namespace' => $rt->getNamespace(),
 932                                         'rd_title' => $rt->getDBkey(),
 933                                         'rd_fragment' => $rt->getFragment(),
 934                                         'rd_interwiki' => $rt->getInterwiki(),
 935                                 ],
 936                                 __METHOD__
 937                         );
 938                 }
 939
 940                 $dbw->endAtomic( __METHOD__ );
 941         }
 942
 943         /**
 944          * Get the Title object or URL this page redirects to
 945          *
 946          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 947          */
 948         public function followRedirect() {
 949                 return $this->getRedirectURL( $this->getRedirectTarget() );
 950         }
 951
 952         /**
 953          * Get the Title object or URL to use for a redirect. We use Title
 954          * objects for same-wiki, non-special redirects and URLs for everything
 955          * else.
 956          * @param Title $rt Redirect target
 957          * @return bool|Title|string False, Title object of local target, or string with URL
 958          */
 959         public function getRedirectURL( $rt ) {
 960                 if ( !$rt ) {
 961                         return false;
 962                 }
 963
 964                 if ( $rt->isExternal() ) {
 965                         if ( $rt->isLocal() ) {
 966                                 // Offsite wikis need an HTTP redirect.
 967                                 // This can be hard to reverse and may produce loops,
 968                                 // so they may be disabled in the site configuration.
 969                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 970                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 971                         } else {
 972                                 // External pages without "local" bit set are not valid
 973                                 // redirect targets
 974                                 return false;
 975                         }
 976                 }
 977
 978                 if ( $rt->isSpecialPage() ) {
 979                         // Gotta handle redirects to special pages differently:
 980                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 981                         // Some pages are not valid targets.
 982                         if ( $rt->isValidRedirectTarget() ) {
 983                                 return $rt->getFullURL();
 984                         } else {
 985                                 return false;
 986                         }
 987                 }
 988
 989                 return $rt;
 990         }
 991
 992         /**
 993          * Get a list of users who have edited this article, not including the user who made
 994          * the most recent revision, which you can get from $article->getUser() if you want it
 995          * @return UserArrayFromResult
 996          */
 997         public function getContributors() {
 998                 // @todo FIXME: This is expensive; cache this info somewhere.
 999
1000                 $dbr = wfGetDB( DB_REPLICA );
1001
1002                 if ( $dbr->implicitGroupby() ) {
1003                         $realNameField = 'user_real_name';
1004                 } else {
1005                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1006                 }
1007
1008                 $tables = [ 'revision', 'user' ];
1009
1010                 $fields = [
1011                         'user_id' => 'rev_user',
1012                         'user_name' => 'rev_user_text',
1013                         $realNameField,
1014                         'timestamp' => 'MAX(rev_timestamp)',
1015                 ];
1016
1017                 $conds = [ 'rev_page' => $this->getId() ];
1018
1019                 // The user who made the top revision gets credited as "this page was last edited by
1020                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1021                 $user = $this->getUser();
1022                 if ( $user ) {
1023                         $conds[] = "rev_user != $user";
1024                 } else {
1025                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1026                 }
1027
1028                 // Username hidden?
1029                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1030
1031                 $jconds = [
1032                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1033                 ];
1034
1035                 $options = [
1036                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1037                         'ORDER BY' => 'timestamp DESC',
1038                 ];
1039
1040                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1041                 return new UserArrayFromResult( $res );
1042         }
1043
1044         /**
1045          * Should the parser cache be used?
1046          *
1047          * @param ParserOptions $parserOptions ParserOptions to check
1048          * @param int $oldId
1049          * @return bool
1050          */
1051         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1052                 return $parserOptions->getStubThreshold() == 0
1053                         && $this->exists()
1054                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1055                         && $this->getContentHandler()->isParserCacheSupported();
1056         }
1057
1058         /**
1059          * Get a ParserOutput for the given ParserOptions and revision ID.
1060          *
1061          * The parser cache will be used if possible. Cache misses that result
1062          * in parser runs are debounced with PoolCounter.
1063          *
1064          * @since 1.19
1065          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1066          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1067          *                             get the current revision (default value)
1068          * @param bool          $forceParse Force reindexing, regardless of cache settings
1069          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1070          */
1071         public function getParserOutput(
1072                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1073         ) {
1074                 $useParserCache =
1075                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1076                 wfDebug( __METHOD__ .
1077                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1078                 if ( $parserOptions->getStubThreshold() ) {
1079                         wfIncrStats( 'pcache.miss.stub' );
1080                 }
1081
1082                 if ( $useParserCache ) {
1083                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1084                         if ( $parserOutput !== false ) {
1085                                 return $parserOutput;
1086                         }
1087                 }
1088
1089                 if ( $oldid === null || $oldid === 0 ) {
1090                         $oldid = $this->getLatest();
1091                 }
1092
1093                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1094                 $pool->execute();
1095
1096                 return $pool->getParserOutput();
1097         }
1098
1099         /**
1100          * Do standard deferred updates after page view (existing or missing page)
1101          * @param User $user The relevant user
1102          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1103          */
1104         public function doViewUpdates( User $user, $oldid = 0 ) {
1105                 if ( wfReadOnly() ) {
1106                         return;
1107                 }
1108
1109                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1110                 // Update newtalk / watchlist notification status
1111                 try {
1112                         $user->clearNotification( $this->mTitle, $oldid );
1113                 } catch ( DBError $e ) {
1114                         // Avoid outage if the master is not reachable
1115                         MWExceptionHandler::logException( $e );
1116                 }
1117         }
1118
1119         /**
1120          * Perform the actions of a page purging
1121          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1122          * @return bool
1123          */
1124         public function doPurge( $flags = self::PURGE_ALL ) {
1125                 // Avoid PHP 7.1 warning of passing $this by reference
1126                 $wikiPage = $this;
1127
1128                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1129                         return false;
1130                 }
1131
1132                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1133                         // Set page_touched in the database to invalidate all DC caches
1134                         $this->mTitle->invalidateCache();
1135                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1136                         // Delete the parser options key in the local cluster to invalidate the DC cache
1137                         ParserCache::singleton()->deleteOptionsKey( $this );
1138                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1139                         $cache = ObjectCache::getLocalClusterInstance();
1140                         $cache->set(
1141                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1142                                 wfTimestamp( TS_MW ),
1143                                 $cache::TTL_HOUR
1144                         );
1145                 }
1146
1147                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1148                         // Clear any HTML file cache
1149                         HTMLFileCache::clearFileCache( $this->getTitle() );
1150                         // Send purge after any page_touched above update was committed
1151                         DeferredUpdates::addUpdate(
1152                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1153                                 DeferredUpdates::PRESEND
1154                         );
1155                 }
1156
1157                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1158                         $messageCache = MessageCache::singleton();
1159                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1160                 }
1161
1162                 return true;
1163         }
1164
1165         /**
1166          * Get the last time a user explicitly purged the page via action=purge
1167          *
1168          * @return string|bool TS_MW timestamp or false
1169          * @since 1.28
1170          */
1171         public function getLastPurgeTimestamp() {
1172                 $cache = ObjectCache::getLocalClusterInstance();
1173
1174                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1175         }
1176
1177         /**
1178          * Insert a new empty page record for this article.
1179          * This *must* be followed up by creating a revision
1180          * and running $this->updateRevisionOn( ... );
1181          * or else the record will be left in a funky state.
1182          * Best if all done inside a transaction.
1183          *
1184          * @param IDatabase $dbw
1185          * @param int|null $pageId Custom page ID that will be used for the insert statement
1186          *
1187          * @return bool|int The newly created page_id key; false if the row was not
1188          *   inserted, e.g. because the title already existed or because the specified
1189          *   page ID is already in use.
1190          */
1191         public function insertOn( $dbw, $pageId = null ) {
1192                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1193                 $dbw->insert(
1194                         'page',
1195                         [
1196                                 'page_id'           => $pageIdForInsert,
1197                                 'page_namespace'    => $this->mTitle->getNamespace(),
1198                                 'page_title'        => $this->mTitle->getDBkey(),
1199                                 'page_restrictions' => '',
1200                                 'page_is_redirect'  => 0, // Will set this shortly...
1201                                 'page_is_new'       => 1,
1202                                 'page_random'       => wfRandom(),
1203                                 'page_touched'      => $dbw->timestamp(),
1204                                 'page_latest'       => 0, // Fill this in shortly...
1205                                 'page_len'          => 0, // Fill this in shortly...
1206                         ],
1207                         __METHOD__,
1208                         'IGNORE'
1209                 );
1210
1211                 if ( $dbw->affectedRows() > 0 ) {
1212                         $newid = $pageId ?: $dbw->insertId();
1213                         $this->mId = $newid;
1214                         $this->mTitle->resetArticleID( $newid );
1215
1216                         return $newid;
1217                 } else {
1218                         return false; // nothing changed
1219                 }
1220         }
1221
1222         /**
1223          * Update the page record to point to a newly saved revision.
1224          *
1225          * @param IDatabase $dbw
1226          * @param Revision $revision For ID number, and text used to set
1227          *   length and redirect status fields
1228          * @param int $lastRevision If given, will not overwrite the page field
1229          *   when different from the currently set value.
1230          *   Giving 0 indicates the new page flag should be set on.
1231          * @param bool $lastRevIsRedirect If given, will optimize adding and
1232          *   removing rows in redirect table.
1233          * @return bool Success; false if the page row was missing or page_latest changed
1234          */
1235         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1236                 $lastRevIsRedirect = null
1237         ) {
1238                 global $wgContentHandlerUseDB;
1239
1240                 // Assertion to try to catch T92046
1241                 if ( (int)$revision->getId() === 0 ) {
1242                         throw new InvalidArgumentException(
1243                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1244                         );
1245                 }
1246
1247                 $content = $revision->getContent();
1248                 $len = $content ? $content->getSize() : 0;
1249                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1250
1251                 $conditions = [ 'page_id' => $this->getId() ];
1252
1253                 if ( !is_null( $lastRevision ) ) {
1254                         // An extra check against threads stepping on each other
1255                         $conditions['page_latest'] = $lastRevision;
1256                 }
1257
1258                 $row = [ /* SET */
1259                         'page_latest'      => $revision->getId(),
1260                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1261                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1262                         'page_is_redirect' => $rt !== null ? 1 : 0,
1263                         'page_len'         => $len,
1264                 ];
1265
1266                 if ( $wgContentHandlerUseDB ) {
1267                         $row['page_content_model'] = $revision->getContentModel();
1268                 }
1269
1270                 $dbw->update( 'page',
1271                         $row,
1272                         $conditions,
1273                         __METHOD__ );
1274
1275                 $result = $dbw->affectedRows() > 0;
1276                 if ( $result ) {
1277                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1278                         $this->setLastEdit( $revision );
1279                         $this->mLatest = $revision->getId();
1280                         $this->mIsRedirect = (bool)$rt;
1281                         // Update the LinkCache.
1282                         LinkCache::singleton()->addGoodLinkObj(
1283                                 $this->getId(),
1284                                 $this->mTitle,
1285                                 $len,
1286                                 $this->mIsRedirect,
1287                                 $this->mLatest,
1288                                 $revision->getContentModel()
1289                         );
1290                 }
1291
1292                 return $result;
1293         }
1294
1295         /**
1296          * Add row to the redirect table if this is a redirect, remove otherwise.
1297          *
1298          * @param IDatabase $dbw
1299          * @param Title $redirectTitle Title object pointing to the redirect target,
1300          *   or NULL if this is not a redirect
1301          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1302          *   removing rows in redirect table.
1303          * @return bool True on success, false on failure
1304          * @private
1305          */
1306         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1307                 // Always update redirects (target link might have changed)
1308                 // Update/Insert if we don't know if the last revision was a redirect or not
1309                 // Delete if changing from redirect to non-redirect
1310                 $isRedirect = !is_null( $redirectTitle );
1311
1312                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1313                         return true;
1314                 }
1315
1316                 if ( $isRedirect ) {
1317                         $this->insertRedirectEntry( $redirectTitle );
1318                 } else {
1319                         // This is not a redirect, remove row from redirect table
1320                         $where = [ 'rd_from' => $this->getId() ];
1321                         $dbw->delete( 'redirect', $where, __METHOD__ );
1322                 }
1323
1324                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1325                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1326                 }
1327
1328                 return ( $dbw->affectedRows() != 0 );
1329         }
1330
1331         /**
1332          * If the given revision is newer than the currently set page_latest,
1333          * update the page record. Otherwise, do nothing.
1334          *
1335          * @deprecated since 1.24, use updateRevisionOn instead
1336          *
1337          * @param IDatabase $dbw
1338          * @param Revision $revision
1339          * @return bool
1340          */
1341         public function updateIfNewerOn( $dbw, $revision ) {
1342
1343                 $row = $dbw->selectRow(
1344                         [ 'revision', 'page' ],
1345                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1346                         [
1347                                 'page_id' => $this->getId(),
1348                                 'page_latest=rev_id' ],
1349                         __METHOD__ );
1350
1351                 if ( $row ) {
1352                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1353                                 return false;
1354                         }
1355                         $prev = $row->rev_id;
1356                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1357                 } else {
1358                         // No or missing previous revision; mark the page as new
1359                         $prev = 0;
1360                         $lastRevIsRedirect = null;
1361                 }
1362
1363                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1364
1365                 return $ret;
1366         }
1367
1368         /**
1369          * Get the content that needs to be saved in order to undo all revisions
1370          * between $undo and $undoafter. Revisions must belong to the same page,
1371          * must exist and must not be deleted
1372          * @param Revision $undo
1373          * @param Revision $undoafter Must be an earlier revision than $undo
1374          * @return Content|bool Content on success, false on failure
1375          * @since 1.21
1376          * Before we had the Content object, this was done in getUndoText
1377          */
1378         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1379                 $handler = $undo->getContentHandler();
1380                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1381         }
1382
1383         /**
1384          * Returns true if this page's content model supports sections.
1385          *
1386          * @return bool
1387          *
1388          * @todo The skin should check this and not offer section functionality if
1389          *   sections are not supported.
1390          * @todo The EditPage should check this and not offer section functionality
1391          *   if sections are not supported.
1392          */
1393         public function supportsSections() {
1394                 return $this->getContentHandler()->supportsSections();
1395         }
1396
1397         /**
1398          * @param string|int|null|bool $sectionId Section identifier as a number or string
1399          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1400          * or 'new' for a new section.
1401          * @param Content $sectionContent New content of the section.
1402          * @param string $sectionTitle New section's subject, only if $section is "new".
1403          * @param string $edittime Revision timestamp or null to use the current revision.
1404          *
1405          * @throws MWException
1406          * @return Content|null New complete article content, or null if error.
1407          *
1408          * @since 1.21
1409          * @deprecated since 1.24, use replaceSectionAtRev instead
1410          */
1411         public function replaceSectionContent(
1412                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1413         ) {
1414
1415                 $baseRevId = null;
1416                 if ( $edittime && $sectionId !== 'new' ) {
1417                         $dbr = wfGetDB( DB_REPLICA );
1418                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1419                         // Try the master if this thread may have just added it.
1420                         // This could be abstracted into a Revision method, but we don't want
1421                         // to encourage loading of revisions by timestamp.
1422                         if ( !$rev
1423                                 && wfGetLB()->getServerCount() > 1
1424                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1425                         ) {
1426                                 $dbw = wfGetDB( DB_MASTER );
1427                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1428                         }
1429                         if ( $rev ) {
1430                                 $baseRevId = $rev->getId();
1431                         }
1432                 }
1433
1434                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1435         }
1436
1437         /**
1438          * @param string|int|null|bool $sectionId Section identifier as a number or string
1439          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1440          * or 'new' for a new section.
1441          * @param Content $sectionContent New content of the section.
1442          * @param string $sectionTitle New section's subject, only if $section is "new".
1443          * @param int|null $baseRevId
1444          *
1445          * @throws MWException
1446          * @return Content|null New complete article content, or null if error.
1447          *
1448          * @since 1.24
1449          */
1450         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1451                 $sectionTitle = '', $baseRevId = null
1452         ) {
1453
1454                 if ( strval( $sectionId ) === '' ) {
1455                         // Whole-page edit; let the whole text through
1456                         $newContent = $sectionContent;
1457                 } else {
1458                         if ( !$this->supportsSections() ) {
1459                                 throw new MWException( "sections not supported for content model " .
1460                                         $this->getContentHandler()->getModelID() );
1461                         }
1462
1463                         // Bug 30711: always use current version when adding a new section
1464                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1465                                 $oldContent = $this->getContent();
1466                         } else {
1467                                 $rev = Revision::newFromId( $baseRevId );
1468                                 if ( !$rev ) {
1469                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1470                                                 $this->getId() . "; section: $sectionId)\n" );
1471                                         return null;
1472                                 }
1473
1474                                 $oldContent = $rev->getContent();
1475                         }
1476
1477                         if ( !$oldContent ) {
1478                                 wfDebug( __METHOD__ . ": no page text\n" );
1479                                 return null;
1480                         }
1481
1482                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1483                 }
1484
1485                 return $newContent;
1486         }
1487
1488         /**
1489          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1490          * @param int $flags
1491          * @return int Updated $flags
1492          */
1493         public function checkFlags( $flags ) {
1494                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1495                         if ( $this->exists() ) {
1496                                 $flags |= EDIT_UPDATE;
1497                         } else {
1498                                 $flags |= EDIT_NEW;
1499                         }
1500                 }
1501
1502                 return $flags;
1503         }
1504
1505         /**
1506          * Change an existing article or create a new article. Updates RC and all necessary caches,
1507          * optionally via the deferred update array.
1508          *
1509          * @param Content $content New content
1510          * @param string $summary Edit summary
1511          * @param int $flags Bitfield:
1512          *      EDIT_NEW
1513          *          Article is known or assumed to be non-existent, create a new one
1514          *      EDIT_UPDATE
1515          *          Article is known or assumed to be pre-existing, update it
1516          *      EDIT_MINOR
1517          *          Mark this edit minor, if the user is allowed to do so
1518          *      EDIT_SUPPRESS_RC
1519          *          Do not log the change in recentchanges
1520          *      EDIT_FORCE_BOT
1521          *          Mark the edit a "bot" edit regardless of user rights
1522          *      EDIT_AUTOSUMMARY
1523          *          Fill in blank summaries with generated text where possible
1524          *      EDIT_INTERNAL
1525          *          Signal that the page retrieve/save cycle happened entirely in this request.
1526          *
1527          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1528          * article will be detected. If EDIT_UPDATE is specified and the article
1529          * doesn't exist, the function will return an edit-gone-missing error. If
1530          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1531          * error will be returned. These two conditions are also possible with
1532          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1533          *
1534          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1535          *   This is not the parent revision ID, rather the revision ID for older
1536          *   content used as the source for a rollback, for example.
1537          * @param User $user The user doing the edit
1538          * @param string $serialFormat Format for storing the content in the
1539          *   database.
1540          * @param array|null $tags Change tags to apply to this edit
1541          * Callers are responsible for permission checks
1542          * (with ChangeTags::canAddTagsAccompanyingChange)
1543          * @param Int $undidRevId Id of revision that was undone or 0
1544          *
1545          * @throws MWException
1546          * @return Status Possible errors:
1547          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1548          *       set the fatal flag of $status.
1549          *     edit-gone-missing: In update mode, but the article didn't exist.
1550          *     edit-conflict: In update mode, the article changed unexpectedly.
1551          *     edit-no-change: Warning that the text was the same as before.
1552          *     edit-already-exists: In creation mode, but the article already exists.
1553          *
1554          *  Extensions may define additional errors.
1555          *
1556          *  $return->value will contain an associative array with members as follows:
1557          *     new: Boolean indicating if the function attempted to create a new article.
1558          *     revision: The revision object for the inserted revision, or null.
1559          *
1560          * @since 1.21
1561          * @throws MWException
1562          */
1563         public function doEditContent(
1564                 Content $content, $summary, $flags = 0, $baseRevId = false,
1565                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1566         ) {
1567                 global $wgUser, $wgUseAutomaticEditSummaries;
1568
1569                 // Old default parameter for $tags was null
1570                 if ( $tags === null ) {
1571                         $tags = [];
1572                 }
1573
1574                 // Low-level sanity check
1575                 if ( $this->mTitle->getText() === '' ) {
1576                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1577                 }
1578                 // Make sure the given content type is allowed for this page
1579                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1580                         return Status::newFatal( 'content-not-allowed-here',
1581                                 ContentHandler::getLocalizedName( $content->getModel() ),
1582                                 $this->mTitle->getPrefixedText()
1583                         );
1584                 }
1585
1586                 // Load the data from the master database if needed.
1587                 // The caller may already loaded it from the master or even loaded it using
1588                 // SELECT FOR UPDATE, so do not override that using clear().
1589                 $this->loadPageData( 'fromdbmaster' );
1590
1591                 $user = $user ?: $wgUser;
1592                 $flags = $this->checkFlags( $flags );
1593
1594                 // Avoid PHP 7.1 warning of passing $this by reference
1595                 $wikiPage = $this;
1596
1597                 // Trigger pre-save hook (using provided edit summary)
1598                 $hookStatus = Status::newGood( [] );
1599                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1600                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1601                 // Check if the hook rejected the attempted save
1602                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1603                         if ( $hookStatus->isOK() ) {
1604                                 // Hook returned false but didn't call fatal(); use generic message
1605                                 $hookStatus->fatal( 'edit-hook-aborted' );
1606                         }
1607
1608                         return $hookStatus;
1609                 }
1610
1611                 $old_revision = $this->getRevision(); // current revision
1612                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1613
1614                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1615                         $tags[] = 'mw-contentmodelchange';
1616                 }
1617
1618                 // Provide autosummaries if one is not provided and autosummaries are enabled
1619                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1620                         $handler = $content->getContentHandler();
1621                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1622                 }
1623
1624                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1625                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1626                         $useCache = false;
1627                 } else {
1628                         $useCache = true;
1629                 }
1630
1631                 // Get the pre-save transform content and final parser output
1632                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1633                 $pstContent = $editInfo->pstContent; // Content object
1634                 $meta = [
1635                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1636                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1637                         'serialized' => $editInfo->pst,
1638                         'serialFormat' => $serialFormat,
1639                         'baseRevId' => $baseRevId,
1640                         'oldRevision' => $old_revision,
1641                         'oldContent' => $old_content,
1642                         'oldId' => $this->getLatest(),
1643                         'oldIsRedirect' => $this->isRedirect(),
1644                         'oldCountable' => $this->isCountable(),
1645                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1646                         'undidRevId' => $undidRevId
1647                 ];
1648
1649                 // Actually create the revision and create/update the page
1650                 if ( $flags & EDIT_UPDATE ) {
1651                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1652                 } else {
1653                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1654                 }
1655
1656                 // Promote user to any groups they meet the criteria for
1657                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1658                         $user->addAutopromoteOnceGroups( 'onEdit' );
1659                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1660                 } );
1661
1662                 return $status;
1663         }
1664
1665         /**
1666          * @param Content $content Pre-save transform content
1667          * @param integer $flags
1668          * @param User $user
1669          * @param string $summary
1670          * @param array $meta
1671          * @return Status
1672          * @throws DBUnexpectedError
1673          * @throws Exception
1674          * @throws FatalError
1675          * @throws MWException
1676          */
1677         private function doModify(
1678                 Content $content, $flags, User $user, $summary, array $meta
1679         ) {
1680                 global $wgUseRCPatrol;
1681
1682                 // Update article, but only if changed.
1683                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1684
1685                 // Convenience variables
1686                 $now = wfTimestampNow();
1687                 $oldid = $meta['oldId'];
1688                 /** @var $oldContent Content|null */
1689                 $oldContent = $meta['oldContent'];
1690                 $newsize = $content->getSize();
1691
1692                 if ( !$oldid ) {
1693                         // Article gone missing
1694                         $status->fatal( 'edit-gone-missing' );
1695
1696                         return $status;
1697                 } elseif ( !$oldContent ) {
1698                         // Sanity check for bug 37225
1699                         throw new MWException( "Could not find text for current revision {$oldid}." );
1700                 }
1701
1702                 // @TODO: pass content object?!
1703                 $revision = new Revision( [
1704                         'page'       => $this->getId(),
1705                         'title'      => $this->mTitle, // for determining the default content model
1706                         'comment'    => $summary,
1707                         'minor_edit' => $meta['minor'],
1708                         'text'       => $meta['serialized'],
1709                         'len'        => $newsize,
1710                         'parent_id'  => $oldid,
1711                         'user'       => $user->getId(),
1712                         'user_text'  => $user->getName(),
1713                         'timestamp'  => $now,
1714                         'content_model' => $content->getModel(),
1715                         'content_format' => $meta['serialFormat'],
1716                 ] );
1717
1718                 $changed = !$content->equals( $oldContent );
1719
1720                 $dbw = wfGetDB( DB_MASTER );
1721
1722                 if ( $changed ) {
1723                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1724                         $status->merge( $prepStatus );
1725                         if ( !$status->isOK() ) {
1726                                 return $status;
1727                         }
1728
1729                         $dbw->startAtomic( __METHOD__ );
1730                         // Get the latest page_latest value while locking it.
1731                         // Do a CAS style check to see if it's the same as when this method
1732                         // started. If it changed then bail out before touching the DB.
1733                         $latestNow = $this->lockAndGetLatest();
1734                         if ( $latestNow != $oldid ) {
1735                                 $dbw->endAtomic( __METHOD__ );
1736                                 // Page updated or deleted in the mean time
1737                                 $status->fatal( 'edit-conflict' );
1738
1739                                 return $status;
1740                         }
1741
1742                         // At this point we are now comitted to returning an OK
1743                         // status unless some DB query error or other exception comes up.
1744                         // This way callers don't have to call rollback() if $status is bad
1745                         // unless they actually try to catch exceptions (which is rare).
1746
1747                         // Save the revision text
1748                         $revisionId = $revision->insertOn( $dbw );
1749                         // Update page_latest and friends to reflect the new revision
1750                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1751                                 throw new MWException( "Failed to update page row to use new revision." );
1752                         }
1753
1754                         Hooks::run( 'NewRevisionFromEditComplete',
1755                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1756
1757                         // Update recentchanges
1758                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1759                                 // Mark as patrolled if the user can do so
1760                                 $patrolled = $wgUseRCPatrol && !count(
1761                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1762                                 // Add RC row to the DB
1763                                 RecentChange::notifyEdit(
1764                                         $now,
1765                                         $this->mTitle,
1766                                         $revision->isMinor(),
1767                                         $user,
1768                                         $summary,
1769                                         $oldid,
1770                                         $this->getTimestamp(),
1771                                         $meta['bot'],
1772                                         '',
1773                                         $oldContent ? $oldContent->getSize() : 0,
1774                                         $newsize,
1775                                         $revisionId,
1776                                         $patrolled,
1777                                         $meta['tags']
1778                                 );
1779                         }
1780
1781                         $user->incEditCount();
1782
1783                         $dbw->endAtomic( __METHOD__ );
1784                         $this->mTimestamp = $now;
1785                 } else {
1786                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1787                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1788                         $revision->setId( $this->getLatest() );
1789                         $revision->setUserIdAndName(
1790                                 $this->getUser( Revision::RAW ),
1791                                 $this->getUserText( Revision::RAW )
1792                         );
1793                 }
1794
1795                 if ( $changed ) {
1796                         // Return the new revision to the caller
1797                         $status->value['revision'] = $revision;
1798                 } else {
1799                         $status->warning( 'edit-no-change' );
1800                         // Update page_touched as updateRevisionOn() was not called.
1801                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1802                         $this->mTitle->invalidateCache( $now );
1803                 }
1804
1805                 // Do secondary updates once the main changes have been committed...
1806                 DeferredUpdates::addUpdate(
1807                         new AtomicSectionUpdate(
1808                                 $dbw,
1809                                 __METHOD__,
1810                                 function () use (
1811                                         $revision, &$user, $content, $summary, &$flags,
1812                                         $changed, $meta, &$status
1813                                 ) {
1814                                         // Update links tables, site stats, etc.
1815                                         $this->doEditUpdates(
1816                                                 $revision,
1817                                                 $user,
1818                                                 [
1819                                                         'changed' => $changed,
1820                                                         'oldcountable' => $meta['oldCountable'],
1821                                                         'oldrevision' => $meta['oldRevision']
1822                                                 ]
1823                                         );
1824                                         // Avoid PHP 7.1 warning of passing $this by reference
1825                                         $wikiPage = $this;
1826                                         // Trigger post-save hook
1827                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1828                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1829                                                 $meta['undidRevId'] ];
1830                                         Hooks::run( 'PageContentSaveComplete', $params );
1831                                 }
1832                         ),
1833                         DeferredUpdates::PRESEND
1834                 );
1835
1836                 return $status;
1837         }
1838
1839         /**
1840          * @param Content $content Pre-save transform content
1841          * @param integer $flags
1842          * @param User $user
1843          * @param string $summary
1844          * @param array $meta
1845          * @return Status
1846          * @throws DBUnexpectedError
1847          * @throws Exception
1848          * @throws FatalError
1849          * @throws MWException
1850          */
1851         private function doCreate(
1852                 Content $content, $flags, User $user, $summary, array $meta
1853         ) {
1854                 global $wgUseRCPatrol, $wgUseNPPatrol;
1855
1856                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1857
1858                 $now = wfTimestampNow();
1859                 $newsize = $content->getSize();
1860                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1861                 $status->merge( $prepStatus );
1862                 if ( !$status->isOK() ) {
1863                         return $status;
1864                 }
1865
1866                 $dbw = wfGetDB( DB_MASTER );
1867                 $dbw->startAtomic( __METHOD__ );
1868
1869                 // Add the page record unless one already exists for the title
1870                 $newid = $this->insertOn( $dbw );
1871                 if ( $newid === false ) {
1872                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1873                         $status->fatal( 'edit-already-exists' );
1874
1875                         return $status; // nothing done
1876                 }
1877
1878                 // At this point we are now comitted to returning an OK
1879                 // status unless some DB query error or other exception comes up.
1880                 // This way callers don't have to call rollback() if $status is bad
1881                 // unless they actually try to catch exceptions (which is rare).
1882
1883                 // @TODO: pass content object?!
1884                 $revision = new Revision( [
1885                         'page'       => $newid,
1886                         'title'      => $this->mTitle, // for determining the default content model
1887                         'comment'    => $summary,
1888                         'minor_edit' => $meta['minor'],
1889                         'text'       => $meta['serialized'],
1890                         'len'        => $newsize,
1891                         'user'       => $user->getId(),
1892                         'user_text'  => $user->getName(),
1893                         'timestamp'  => $now,
1894                         'content_model' => $content->getModel(),
1895                         'content_format' => $meta['serialFormat'],
1896                 ] );
1897
1898                 // Save the revision text...
1899                 $revisionId = $revision->insertOn( $dbw );
1900                 // Update the page record with revision data
1901                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1902                         throw new MWException( "Failed to update page row to use new revision." );
1903                 }
1904
1905                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1906
1907                 // Update recentchanges
1908                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1909                         // Mark as patrolled if the user can do so
1910                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1911                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1912                         // Add RC row to the DB
1913                         RecentChange::notifyNew(
1914                                 $now,
1915                                 $this->mTitle,
1916                                 $revision->isMinor(),
1917                                 $user,
1918                                 $summary,
1919                                 $meta['bot'],
1920                                 '',
1921                                 $newsize,
1922                                 $revisionId,
1923                                 $patrolled,
1924                                 $meta['tags']
1925                         );
1926                 }
1927
1928                 $user->incEditCount();
1929
1930                 $dbw->endAtomic( __METHOD__ );
1931                 $this->mTimestamp = $now;
1932
1933                 // Return the new revision to the caller
1934                 $status->value['revision'] = $revision;
1935
1936                 // Do secondary updates once the main changes have been committed...
1937                 DeferredUpdates::addUpdate(
1938                         new AtomicSectionUpdate(
1939                                 $dbw,
1940                                 __METHOD__,
1941                                 function () use (
1942                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1943                                 ) {
1944                                         // Update links, etc.
1945                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1946                                         // Avoid PHP 7.1 warning of passing $this by reference
1947                                         $wikiPage = $this;
1948                                         // Trigger post-create hook
1949                                         $params = [ &$wikiPage, &$user, $content, $summary,
1950                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1951                                         Hooks::run( 'PageContentInsertComplete', $params );
1952                                         // Trigger post-save hook
1953                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
1954                                         Hooks::run( 'PageContentSaveComplete', $params );
1955                                 }
1956                         ),
1957                         DeferredUpdates::PRESEND
1958                 );
1959
1960                 return $status;
1961         }
1962
1963         /**
1964          * Get parser options suitable for rendering the primary article wikitext
1965          *
1966          * @see ContentHandler::makeParserOptions
1967          *
1968          * @param IContextSource|User|string $context One of the following:
1969          *        - IContextSource: Use the User and the Language of the provided
1970          *          context
1971          *        - User: Use the provided User object and $wgLang for the language,
1972          *          so use an IContextSource object if possible.
1973          *        - 'canonical': Canonical options (anonymous user with default
1974          *          preferences and content language).
1975          * @return ParserOptions
1976          */
1977         public function makeParserOptions( $context ) {
1978                 $options = $this->getContentHandler()->makeParserOptions( $context );
1979
1980                 if ( $this->getTitle()->isConversionTable() ) {
1981                         // @todo ConversionTable should become a separate content model, so
1982                         // we don't need special cases like this one.
1983                         $options->disableContentConversion();
1984                 }
1985
1986                 return $options;
1987         }
1988
1989         /**
1990          * Prepare content which is about to be saved.
1991          * Returns a stdClass with source, pst and output members
1992          *
1993          * @param Content $content
1994          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
1995          *        revision ID is also accepted, but this is deprecated.
1996          * @param User|null $user
1997          * @param string|null $serialFormat
1998          * @param bool $useCache Check shared prepared edit cache
1999          *
2000          * @return object
2001          *
2002          * @since 1.21
2003          */
2004         public function prepareContentForEdit(
2005                 Content $content, $revision = null, User $user = null,
2006                 $serialFormat = null, $useCache = true
2007         ) {
2008                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2009
2010                 if ( is_object( $revision ) ) {
2011                         $revid = $revision->getId();
2012                 } else {
2013                         $revid = $revision;
2014                         // This code path is deprecated, and nothing is known to
2015                         // use it, so performance here shouldn't be a worry.
2016                         if ( $revid !== null ) {
2017                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2018                         } else {
2019                                 $revision = null;
2020                         }
2021                 }
2022
2023                 $user = is_null( $user ) ? $wgUser : $user;
2024                 // XXX: check $user->getId() here???
2025
2026                 // Use a sane default for $serialFormat, see bug 57026
2027                 if ( $serialFormat === null ) {
2028                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2029                 }
2030
2031                 if ( $this->mPreparedEdit
2032                         && isset( $this->mPreparedEdit->newContent )
2033                         && $this->mPreparedEdit->newContent->equals( $content )
2034                         && $this->mPreparedEdit->revid == $revid
2035                         && $this->mPreparedEdit->format == $serialFormat
2036                         // XXX: also check $user here?
2037                 ) {
2038                         // Already prepared
2039                         return $this->mPreparedEdit;
2040                 }
2041
2042                 // The edit may have already been prepared via api.php?action=stashedit
2043                 $cachedEdit = $useCache && $wgAjaxEditStash
2044                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2045                         : false;
2046
2047                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2048                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2049
2050                 $edit = (object)[];
2051                 if ( $cachedEdit ) {
2052                         $edit->timestamp = $cachedEdit->timestamp;
2053                 } else {
2054                         $edit->timestamp = wfTimestampNow();
2055                 }
2056                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2057                 $edit->revid = $revid;
2058
2059                 if ( $cachedEdit ) {
2060                         $edit->pstContent = $cachedEdit->pstContent;
2061                 } else {
2062                         $edit->pstContent = $content
2063                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2064                                 : null;
2065                 }
2066
2067                 $edit->format = $serialFormat;
2068                 $edit->popts = $this->makeParserOptions( 'canonical' );
2069                 if ( $cachedEdit ) {
2070                         $edit->output = $cachedEdit->output;
2071                 } else {
2072                         if ( $revision ) {
2073                                 // We get here if vary-revision is set. This means that this page references
2074                                 // itself (such as via self-transclusion). In this case, we need to make sure
2075                                 // that any such self-references refer to the newly-saved revision, and not
2076                                 // to the previous one, which could otherwise happen due to replica DB lag.
2077                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2078                                 $edit->popts->setCurrentRevisionCallback(
2079                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2080                                                 if ( $title->equals( $revision->getTitle() ) ) {
2081                                                         return $revision;
2082                                                 } else {
2083                                                         return call_user_func( $oldCallback, $title, $parser );
2084                                                 }
2085                                         }
2086                                 );
2087                         } else {
2088                                 // Try to avoid a second parse if {{REVISIONID}} is used
2089                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2090                                         ? DB_MASTER // use the best possible guess
2091                                         : DB_REPLICA; // T154554
2092
2093                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2094                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2095                                                 'revision',
2096                                                 'MAX(rev_id)',
2097                                                 [],
2098                                                 __METHOD__
2099                                         );
2100                                 } );
2101                         }
2102                         $edit->output = $edit->pstContent
2103                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2104                                 : null;
2105                 }
2106
2107                 $edit->newContent = $content;
2108                 $edit->oldContent = $this->getContent( Revision::RAW );
2109
2110                 // NOTE: B/C for hooks! don't use these fields!
2111                 $edit->newText = $edit->newContent
2112                         ? ContentHandler::getContentText( $edit->newContent )
2113                         : '';
2114                 $edit->oldText = $edit->oldContent
2115                         ? ContentHandler::getContentText( $edit->oldContent )
2116                         : '';
2117                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2118
2119                 if ( $edit->output ) {
2120                         $edit->output->setCacheTime( wfTimestampNow() );
2121                 }
2122
2123                 // Process cache the result
2124                 $this->mPreparedEdit = $edit;
2125
2126                 return $edit;
2127         }
2128
2129         /**
2130          * Do standard deferred updates after page edit.
2131          * Update links tables, site stats, search index and message cache.
2132          * Purges pages that include this page if the text was changed here.
2133          * Every 100th edit, prune the recent changes table.
2134          *
2135          * @param Revision $revision
2136          * @param User $user User object that did the revision
2137          * @param array $options Array of options, following indexes are used:
2138          * - changed: boolean, whether the revision changed the content (default true)
2139          * - created: boolean, whether the revision created the page (default false)
2140          * - moved: boolean, whether the page was moved (default false)
2141          * - restored: boolean, whether the page was undeleted (default false)
2142          * - oldrevision: Revision object for the pre-update revision (default null)
2143          * - oldcountable: boolean, null, or string 'no-change' (default null):
2144          *   - boolean: whether the page was counted as an article before that
2145          *     revision, only used in changed is true and created is false
2146          *   - null: if created is false, don't update the article count; if created
2147          *     is true, do update the article count
2148          *   - 'no-change': don't update the article count, ever
2149          */
2150         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2151                 global $wgRCWatchCategoryMembership;
2152
2153                 $options += [
2154                         'changed' => true,
2155                         'created' => false,
2156                         'moved' => false,
2157                         'restored' => false,
2158                         'oldrevision' => null,
2159                         'oldcountable' => null
2160                 ];
2161                 $content = $revision->getContent();
2162
2163                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2164
2165                 // See if the parser output before $revision was inserted is still valid
2166                 $editInfo = false;
2167                 if ( !$this->mPreparedEdit ) {
2168                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2169                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2170                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2171                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2172                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2173                 ) {
2174                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2175                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2176                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2177                 } else {
2178                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2179                         $editInfo = $this->mPreparedEdit;
2180                 }
2181
2182                 if ( !$editInfo ) {
2183                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2184                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2185                         // as any prepared content from there or in doEditContent() was already rejected.
2186                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2187                 }
2188
2189                 // Save it to the parser cache.
2190                 // Make sure the cache time matches page_touched to avoid double parsing.
2191                 ParserCache::singleton()->save(
2192                         $editInfo->output, $this, $editInfo->popts,
2193                         $revision->getTimestamp(), $editInfo->revid
2194                 );
2195
2196                 // Update the links tables and other secondary data
2197                 if ( $content ) {
2198                         $recursive = $options['changed']; // bug 50785
2199                         $updates = $content->getSecondaryDataUpdates(
2200                                 $this->getTitle(), null, $recursive, $editInfo->output
2201                         );
2202                         foreach ( $updates as $update ) {
2203                                 if ( $update instanceof LinksUpdate ) {
2204                                         $update->setRevision( $revision );
2205                                         $update->setTriggeringUser( $user );
2206                                 }
2207                                 DeferredUpdates::addUpdate( $update );
2208                         }
2209                         if ( $wgRCWatchCategoryMembership
2210                                 && $this->getContentHandler()->supportsCategories() === true
2211                                 && ( $options['changed'] || $options['created'] )
2212                                 && !$options['restored']
2213                         ) {
2214                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2215                                 // the recent change entry (also done via deferred updates) and carry over any
2216                                 // bot/deletion/IP flags, ect.
2217                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2218                                         $this->getTitle(),
2219                                         [
2220                                                 'pageId' => $this->getId(),
2221                                                 'revTimestamp' => $revision->getTimestamp()
2222                                         ]
2223                                 ) );
2224                         }
2225                 }
2226
2227                 // Avoid PHP 7.1 warning of passing $this by reference
2228                 $wikiPage = $this;
2229
2230                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2231
2232                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2233                         // Flush old entries from the `recentchanges` table
2234                         if ( mt_rand( 0, 9 ) == 0 ) {
2235                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2236                         }
2237                 }
2238
2239                 if ( !$this->exists() ) {
2240                         return;
2241                 }
2242
2243                 $id = $this->getId();
2244                 $title = $this->mTitle->getPrefixedDBkey();
2245                 $shortTitle = $this->mTitle->getDBkey();
2246
2247                 if ( $options['oldcountable'] === 'no-change' ||
2248                         ( !$options['changed'] && !$options['moved'] )
2249                 ) {
2250                         $good = 0;
2251                 } elseif ( $options['created'] ) {
2252                         $good = (int)$this->isCountable( $editInfo );
2253                 } elseif ( $options['oldcountable'] !== null ) {
2254                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2255                 } else {
2256                         $good = 0;
2257                 }
2258                 $edits = $options['changed'] ? 1 : 0;
2259                 $total = $options['created'] ? 1 : 0;
2260
2261                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2262                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2263
2264                 // If this is another user's talk page, update newtalk.
2265                 // Don't do this if $options['changed'] = false (null-edits) nor if
2266                 // it's a minor edit and the user doesn't want notifications for those.
2267                 if ( $options['changed']
2268                         && $this->mTitle->getNamespace() == NS_USER_TALK
2269                         && $shortTitle != $user->getTitleKey()
2270                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2271                 ) {
2272                         $recipient = User::newFromName( $shortTitle, false );
2273                         if ( !$recipient ) {
2274                                 wfDebug( __METHOD__ . ": invalid username\n" );
2275                         } else {
2276                                 // Avoid PHP 7.1 warning of passing $this by reference
2277                                 $wikiPage = $this;
2278
2279                                 // Allow extensions to prevent user notification
2280                                 // when a new message is added to their talk page
2281                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2282                                         if ( User::isIP( $shortTitle ) ) {
2283                                                 // An anonymous user
2284                                                 $recipient->setNewtalk( true, $revision );
2285                                         } elseif ( $recipient->isLoggedIn() ) {
2286                                                 $recipient->setNewtalk( true, $revision );
2287                                         } else {
2288                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2289                                         }
2290                                 }
2291                         }
2292                 }
2293
2294                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2295                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2296                 }
2297
2298                 if ( $options['created'] ) {
2299                         self::onArticleCreate( $this->mTitle );
2300                 } elseif ( $options['changed'] ) { // bug 50785
2301                         self::onArticleEdit( $this->mTitle, $revision );
2302                 }
2303
2304                 ResourceLoaderWikiModule::invalidateModuleCache(
2305                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2306                 );
2307         }
2308
2309         /**
2310          * Update the article's restriction field, and leave a log entry.
2311          * This works for protection both existing and non-existing pages.
2312          *
2313          * @param array $limit Set of restriction keys
2314          * @param array $expiry Per restriction type expiration
2315          * @param int &$cascade Set to false if cascading protection isn't allowed.
2316          * @param string $reason
2317          * @param User $user The user updating the restrictions
2318          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2319          *   ($user should be able to add the specified tags before this is called)
2320          * @return Status Status object; if action is taken, $status->value is the log_id of the
2321          *   protection log entry.
2322          */
2323         public function doUpdateRestrictions( array $limit, array $expiry,
2324                 &$cascade, $reason, User $user, $tags = null
2325         ) {
2326                 global $wgCascadingRestrictionLevels, $wgContLang;
2327
2328                 if ( wfReadOnly() ) {
2329                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2330                 }
2331
2332                 $this->loadPageData( 'fromdbmaster' );
2333                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2334                 $id = $this->getId();
2335
2336                 if ( !$cascade ) {
2337                         $cascade = false;
2338                 }
2339
2340                 // Take this opportunity to purge out expired restrictions
2341                 Title::purgeExpiredRestrictions();
2342
2343                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2344                 // we expect a single selection, but the schema allows otherwise.
2345                 $isProtected = false;
2346                 $protect = false;
2347                 $changed = false;
2348
2349                 $dbw = wfGetDB( DB_MASTER );
2350
2351                 foreach ( $restrictionTypes as $action ) {
2352                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2353                                 $expiry[$action] = 'infinity';
2354                         }
2355                         if ( !isset( $limit[$action] ) ) {
2356                                 $limit[$action] = '';
2357                         } elseif ( $limit[$action] != '' ) {
2358                                 $protect = true;
2359                         }
2360
2361                         // Get current restrictions on $action
2362                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2363                         if ( $current != '' ) {
2364                                 $isProtected = true;
2365                         }
2366
2367                         if ( $limit[$action] != $current ) {
2368                                 $changed = true;
2369                         } elseif ( $limit[$action] != '' ) {
2370                                 // Only check expiry change if the action is actually being
2371                                 // protected, since expiry does nothing on an not-protected
2372                                 // action.
2373                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2374                                         $changed = true;
2375                                 }
2376                         }
2377                 }
2378
2379                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2380                         $changed = true;
2381                 }
2382
2383                 // If nothing has changed, do nothing
2384                 if ( !$changed ) {
2385                         return Status::newGood();
2386                 }
2387
2388                 if ( !$protect ) { // No protection at all means unprotection
2389                         $revCommentMsg = 'unprotectedarticle-comment';
2390                         $logAction = 'unprotect';
2391                 } elseif ( $isProtected ) {
2392                         $revCommentMsg = 'modifiedarticleprotection-comment';
2393                         $logAction = 'modify';
2394                 } else {
2395                         $revCommentMsg = 'protectedarticle-comment';
2396                         $logAction = 'protect';
2397                 }
2398
2399                 // Truncate for whole multibyte characters
2400                 $reason = $wgContLang->truncate( $reason, 255 );
2401
2402                 $logRelationsValues = [];
2403                 $logRelationsField = null;
2404                 $logParamsDetails = [];
2405
2406                 // Null revision (used for change tag insertion)
2407                 $nullRevision = null;
2408
2409                 if ( $id ) { // Protection of existing page
2410                         // Avoid PHP 7.1 warning of passing $this by reference
2411                         $wikiPage = $this;
2412
2413                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2414                                 return Status::newGood();
2415                         }
2416
2417                         // Only certain restrictions can cascade...
2418                         $editrestriction = isset( $limit['edit'] )
2419                                 ? [ $limit['edit'] ]
2420                                 : $this->mTitle->getRestrictions( 'edit' );
2421                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2422                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2423                         }
2424                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2425                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2426                         }
2427
2428                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2429                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2430                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2431                         }
2432                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2433                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2434                         }
2435
2436                         // The schema allows multiple restrictions
2437                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2438                                 $cascade = false;
2439                         }
2440
2441                         // insert null revision to identify the page protection change as edit summary
2442                         $latest = $this->getLatest();
2443                         $nullRevision = $this->insertProtectNullRevision(
2444                                 $revCommentMsg,
2445                                 $limit,
2446                                 $expiry,
2447                                 $cascade,
2448                                 $reason,
2449                                 $user
2450                         );
2451
2452                         if ( $nullRevision === null ) {
2453                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2454                         }
2455
2456                         $logRelationsField = 'pr_id';
2457
2458                         // Update restrictions table
2459                         foreach ( $limit as $action => $restrictions ) {
2460                                 $dbw->delete(
2461                                         'page_restrictions',
2462                                         [
2463                                                 'pr_page' => $id,
2464                                                 'pr_type' => $action
2465                                         ],
2466                                         __METHOD__
2467                                 );
2468                                 if ( $restrictions != '' ) {
2469                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2470                                         $dbw->insert(
2471                                                 'page_restrictions',
2472                                                 [
2473                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2474                                                         'pr_page' => $id,
2475                                                         'pr_type' => $action,
2476                                                         'pr_level' => $restrictions,
2477                                                         'pr_cascade' => $cascadeValue,
2478                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2479                                                 ],
2480                                                 __METHOD__
2481                                         );
2482                                         $logRelationsValues[] = $dbw->insertId();
2483                                         $logParamsDetails[] = [
2484                                                 'type' => $action,
2485                                                 'level' => $restrictions,
2486                                                 'expiry' => $expiry[$action],
2487                                                 'cascade' => (bool)$cascadeValue,
2488                                         ];
2489                                 }
2490                         }
2491
2492                         // Clear out legacy restriction fields
2493                         $dbw->update(
2494                                 'page',
2495                                 [ 'page_restrictions' => '' ],
2496                                 [ 'page_id' => $id ],
2497                                 __METHOD__
2498                         );
2499
2500                         // Avoid PHP 7.1 warning of passing $this by reference
2501                         $wikiPage = $this;
2502
2503                         Hooks::run( 'NewRevisionFromEditComplete',
2504                                 [ $this, $nullRevision, $latest, $user ] );
2505                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2506                 } else { // Protection of non-existing page (also known as "title protection")
2507                         // Cascade protection is meaningless in this case
2508                         $cascade = false;
2509
2510                         if ( $limit['create'] != '' ) {
2511                                 $dbw->replace( 'protected_titles',
2512                                         [ [ 'pt_namespace', 'pt_title' ] ],
2513                                         [
2514                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2515                                                 'pt_title' => $this->mTitle->getDBkey(),
2516                                                 'pt_create_perm' => $limit['create'],
2517                                                 'pt_timestamp' => $dbw->timestamp(),
2518                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2519                                                 'pt_user' => $user->getId(),
2520                                                 'pt_reason' => $reason,
2521                                         ], __METHOD__
2522                                 );
2523                                 $logParamsDetails[] = [
2524                                         'type' => 'create',
2525                                         'level' => $limit['create'],
2526                                         'expiry' => $expiry['create'],
2527                                 ];
2528                         } else {
2529                                 $dbw->delete( 'protected_titles',
2530                                         [
2531                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2532                                                 'pt_title' => $this->mTitle->getDBkey()
2533                                         ], __METHOD__
2534                                 );
2535                         }
2536                 }
2537
2538                 $this->mTitle->flushRestrictions();
2539                 InfoAction::invalidateCache( $this->mTitle );
2540
2541                 if ( $logAction == 'unprotect' ) {
2542                         $params = [];
2543                 } else {
2544                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2545                         $params = [
2546                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2547                                 '5:bool:cascade' => $cascade,
2548                                 'details' => $logParamsDetails, // parameter for localize and api
2549                         ];
2550                 }
2551
2552                 // Update the protection log
2553                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2554                 $logEntry->setTarget( $this->mTitle );
2555                 $logEntry->setComment( $reason );
2556                 $logEntry->setPerformer( $user );
2557                 $logEntry->setParameters( $params );
2558                 if ( !is_null( $nullRevision ) ) {
2559                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2560                 }
2561                 $logEntry->setTags( $tags );
2562                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2563                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2564                 }
2565                 $logId = $logEntry->insert();
2566                 $logEntry->publish( $logId );
2567
2568                 return Status::newGood( $logId );
2569         }
2570
2571         /**
2572          * Insert a new null revision for this page.
2573          *
2574          * @param string $revCommentMsg Comment message key for the revision
2575          * @param array $limit Set of restriction keys
2576          * @param array $expiry Per restriction type expiration
2577          * @param int $cascade Set to false if cascading protection isn't allowed.
2578          * @param string $reason
2579          * @param User|null $user
2580          * @return Revision|null Null on error
2581          */
2582         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2583                 array $expiry, $cascade, $reason, $user = null
2584         ) {
2585                 $dbw = wfGetDB( DB_MASTER );
2586
2587                 // Prepare a null revision to be added to the history
2588                 $editComment = wfMessage(
2589                         $revCommentMsg,
2590                         $this->mTitle->getPrefixedText(),
2591                         $user ? $user->getName() : ''
2592                 )->inContentLanguage()->text();
2593                 if ( $reason ) {
2594                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2595                 }
2596                 $protectDescription = $this->protectDescription( $limit, $expiry );
2597                 if ( $protectDescription ) {
2598                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2599                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2600                                 ->inContentLanguage()->text();
2601                 }
2602                 if ( $cascade ) {
2603                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2604                         $editComment .= wfMessage( 'brackets' )->params(
2605                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2606                         )->inContentLanguage()->text();
2607                 }
2608
2609                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2610                 if ( $nullRev ) {
2611                         $nullRev->insertOn( $dbw );
2612
2613                         // Update page record and touch page
2614                         $oldLatest = $nullRev->getParentId();
2615                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2616                 }
2617
2618                 return $nullRev;
2619         }
2620
2621         /**
2622          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2623          * @return string
2624          */
2625         protected function formatExpiry( $expiry ) {
2626                 global $wgContLang;
2627
2628                 if ( $expiry != 'infinity' ) {
2629                         return wfMessage(
2630                                 'protect-expiring',
2631                                 $wgContLang->timeanddate( $expiry, false, false ),
2632                                 $wgContLang->date( $expiry, false, false ),
2633                                 $wgContLang->time( $expiry, false, false )
2634                         )->inContentLanguage()->text();
2635                 } else {
2636                         return wfMessage( 'protect-expiry-indefinite' )
2637                                 ->inContentLanguage()->text();
2638                 }
2639         }
2640
2641         /**
2642          * Builds the description to serve as comment for the edit.
2643          *
2644          * @param array $limit Set of restriction keys
2645          * @param array $expiry Per restriction type expiration
2646          * @return string
2647          */
2648         public function protectDescription( array $limit, array $expiry ) {
2649                 $protectDescription = '';
2650
2651                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2652                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2653                         # All possible message keys are listed here for easier grepping:
2654                         # * restriction-create
2655                         # * restriction-edit
2656                         # * restriction-move
2657                         # * restriction-upload
2658                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2659                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2660                         # with '' filtered out. All possible message keys are listed below:
2661                         # * protect-level-autoconfirmed
2662                         # * protect-level-sysop
2663                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2664                                 ->inContentLanguage()->text();
2665
2666                         $expiryText = $this->formatExpiry( $expiry[$action] );
2667
2668                         if ( $protectDescription !== '' ) {
2669                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2670                         }
2671                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2672                                 ->params( $actionText, $restrictionsText, $expiryText )
2673                                 ->inContentLanguage()->text();
2674                 }
2675
2676                 return $protectDescription;
2677         }
2678
2679         /**
2680          * Builds the description to serve as comment for the log entry.
2681          *
2682          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2683          * protect description text. Keep them in old format to avoid breaking compatibility.
2684          * TODO: Fix protection log to store structured description and format it on-the-fly.
2685          *
2686          * @param array $limit Set of restriction keys
2687          * @param array $expiry Per restriction type expiration
2688          * @return string
2689          */
2690         public function protectDescriptionLog( array $limit, array $expiry ) {
2691                 global $wgContLang;
2692
2693                 $protectDescriptionLog = '';
2694
2695                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2696                         $expiryText = $this->formatExpiry( $expiry[$action] );
2697                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2698                                 "[$action=$restrictions] ($expiryText)";
2699                 }
2700
2701                 return trim( $protectDescriptionLog );
2702         }
2703
2704         /**
2705          * Take an array of page restrictions and flatten it to a string
2706          * suitable for insertion into the page_restrictions field.
2707          *
2708          * @param string[] $limit
2709          *
2710          * @throws MWException
2711          * @return string
2712          */
2713         protected static function flattenRestrictions( $limit ) {
2714                 if ( !is_array( $limit ) ) {
2715                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2716                 }
2717
2718                 $bits = [];
2719                 ksort( $limit );
2720
2721                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2722                         $bits[] = "$action=$restrictions";
2723                 }
2724
2725                 return implode( ':', $bits );
2726         }
2727
2728         /**
2729          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2730          * backwards compatibility, if you care about error reporting you should use
2731          * doDeleteArticleReal() instead.
2732          *
2733          * Deletes the article with database consistency, writes logs, purges caches
2734          *
2735          * @param string $reason Delete reason for deletion log
2736          * @param bool $suppress Suppress all revisions and log the deletion in
2737          *        the suppression log instead of the deletion log
2738          * @param int $u1 Unused
2739          * @param bool $u2 Unused
2740          * @param array|string &$error Array of errors to append to
2741          * @param User $user The deleting user
2742          * @return bool True if successful
2743          */
2744         public function doDeleteArticle(
2745                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2746         ) {
2747                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2748                 return $status->isGood();
2749         }
2750
2751         /**
2752          * Back-end article deletion
2753          * Deletes the article with database consistency, writes logs, purges caches
2754          *
2755          * @since 1.19
2756          *
2757          * @param string $reason Delete reason for deletion log
2758          * @param bool $suppress Suppress all revisions and log the deletion in
2759          *   the suppression log instead of the deletion log
2760          * @param int $u1 Unused
2761          * @param bool $u2 Unused
2762          * @param array|string &$error Array of errors to append to
2763          * @param User $user The deleting user
2764          * @param array $tags Tags to apply to the deletion action
2765          * @return Status Status object; if successful, $status->value is the log_id of the
2766          *   deletion log entry. If the page couldn't be deleted because it wasn't
2767          *   found, $status is a non-fatal 'cannotdelete' error
2768          */
2769         public function doDeleteArticleReal(
2770                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2771                 $tags = [], $logsubtype = 'delete'
2772         ) {
2773                 global $wgUser, $wgContentHandlerUseDB;
2774
2775                 wfDebug( __METHOD__ . "\n" );
2776
2777                 $status = Status::newGood();
2778
2779                 if ( $this->mTitle->getDBkey() === '' ) {
2780                         $status->error( 'cannotdelete',
2781                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2782                         return $status;
2783                 }
2784
2785                 // Avoid PHP 7.1 warning of passing $this by reference
2786                 $wikiPage = $this;
2787
2788                 $user = is_null( $user ) ? $wgUser : $user;
2789                 if ( !Hooks::run( 'ArticleDelete',
2790                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2791                 ) ) {
2792                         if ( $status->isOK() ) {
2793                                 // Hook aborted but didn't set a fatal status
2794                                 $status->fatal( 'delete-hook-aborted' );
2795                         }
2796                         return $status;
2797                 }
2798
2799                 $dbw = wfGetDB( DB_MASTER );
2800                 $dbw->startAtomic( __METHOD__ );
2801
2802                 $this->loadPageData( self::READ_LATEST );
2803                 $id = $this->getId();
2804                 // T98706: lock the page from various other updates but avoid using
2805                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2806                 // the revisions queries (which also JOIN on user). Only lock the page
2807                 // row and CAS check on page_latest to see if the trx snapshot matches.
2808                 $lockedLatest = $this->lockAndGetLatest();
2809                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2810                         $dbw->endAtomic( __METHOD__ );
2811                         // Page not there or trx snapshot is stale
2812                         $status->error( 'cannotdelete',
2813                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2814                         return $status;
2815                 }
2816
2817                 // Given the lock above, we can be confident in the title and page ID values
2818                 $namespace = $this->getTitle()->getNamespace();
2819                 $dbKey = $this->getTitle()->getDBkey();
2820
2821                 // At this point we are now comitted to returning an OK
2822                 // status unless some DB query error or other exception comes up.
2823                 // This way callers don't have to call rollback() if $status is bad
2824                 // unless they actually try to catch exceptions (which is rare).
2825
2826                 // we need to remember the old content so we can use it to generate all deletion updates.
2827                 $revision = $this->getRevision();
2828                 try {
2829                         $content = $this->getContent( Revision::RAW );
2830                 } catch ( Exception $ex ) {
2831                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2832                                 . $ex->getMessage() );
2833
2834                         $content = null;
2835                 }
2836
2837                 $fields = Revision::selectFields();
2838                 $bitfield = false;
2839
2840                 // Bitfields to further suppress the content
2841                 if ( $suppress ) {
2842                         $bitfield = Revision::SUPPRESSED_ALL;
2843                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2844                 }
2845
2846                 // For now, shunt the revision data into the archive table.
2847                 // Text is *not* removed from the text table; bulk storage
2848                 // is left intact to avoid breaking block-compression or
2849                 // immutable storage schemes.
2850                 // In the future, we may keep revisions and mark them with
2851                 // the rev_deleted field, which is reserved for this purpose.
2852
2853                 // Get all of the page revisions
2854                 $res = $dbw->select(
2855                         'revision',
2856                         $fields,
2857                         [ 'rev_page' => $id ],
2858                         __METHOD__,
2859                         'FOR UPDATE'
2860                 );
2861                 // Build their equivalent archive rows
2862                 $rowsInsert = [];
2863                 foreach ( $res as $row ) {
2864                         $rowInsert = [
2865                                 'ar_namespace'  => $namespace,
2866                                 'ar_title'      => $dbKey,
2867                                 'ar_comment'    => $row->rev_comment,
2868                                 'ar_user'       => $row->rev_user,
2869                                 'ar_user_text'  => $row->rev_user_text,
2870                                 'ar_timestamp'  => $row->rev_timestamp,
2871                                 'ar_minor_edit' => $row->rev_minor_edit,
2872                                 'ar_rev_id'     => $row->rev_id,
2873                                 'ar_parent_id'  => $row->rev_parent_id,
2874                                 'ar_text_id'    => $row->rev_text_id,
2875                                 'ar_text'       => '',
2876                                 'ar_flags'      => '',
2877                                 'ar_len'        => $row->rev_len,
2878                                 'ar_page_id'    => $id,
2879                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2880                                 'ar_sha1'       => $row->rev_sha1,
2881                         ];
2882                         if ( $wgContentHandlerUseDB ) {
2883                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2884                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2885                         }
2886                         $rowsInsert[] = $rowInsert;
2887                 }
2888                 // Copy them into the archive table
2889                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2890                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2891                 $archivedRevisionCount = $dbw->affectedRows();
2892
2893                 // Clone the title and wikiPage, so we have the information we need when
2894                 // we log and run the ArticleDeleteComplete hook.
2895                 $logTitle = clone $this->mTitle;
2896                 $wikiPageBeforeDelete = clone $this;
2897
2898                 // Now that it's safely backed up, delete it
2899                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2900                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2901
2902                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2903                 $logtype = $suppress ? 'suppress' : 'delete';
2904
2905                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2906                 $logEntry->setPerformer( $user );
2907                 $logEntry->setTarget( $logTitle );
2908                 $logEntry->setComment( $reason );
2909                 $logEntry->setTags( $tags );
2910                 $logid = $logEntry->insert();
2911
2912                 $dbw->onTransactionPreCommitOrIdle(
2913                         function () use ( $dbw, $logEntry, $logid ) {
2914                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2915                                 $logEntry->publish( $logid );
2916                         },
2917                         __METHOD__
2918                 );
2919
2920                 $dbw->endAtomic( __METHOD__ );
2921
2922                 $this->doDeleteUpdates( $id, $content, $revision );
2923
2924                 Hooks::run( 'ArticleDeleteComplete', [
2925                         &$wikiPageBeforeDelete,
2926                         &$user,
2927                         $reason,
2928                         $id,
2929                         $content,
2930                         $logEntry,
2931                         $archivedRevisionCount
2932                 ] );
2933                 $status->value = $logid;
2934
2935                 // Show log excerpt on 404 pages rather than just a link
2936                 $cache = ObjectCache::getMainStashInstance();
2937                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2938                 $cache->set( $key, 1, $cache::TTL_DAY );
2939
2940                 return $status;
2941         }
2942
2943         /**
2944          * Lock the page row for this title+id and return page_latest (or 0)
2945          *
2946          * @return integer Returns 0 if no row was found with this title+id
2947          * @since 1.27
2948          */
2949         public function lockAndGetLatest() {
2950                 return (int)wfGetDB( DB_MASTER )->selectField(
2951                         'page',
2952                         'page_latest',
2953                         [
2954                                 'page_id' => $this->getId(),
2955                                 // Typically page_id is enough, but some code might try to do
2956                                 // updates assuming the title is the same, so verify that
2957                                 'page_namespace' => $this->getTitle()->getNamespace(),
2958                                 'page_title' => $this->getTitle()->getDBkey()
2959                         ],
2960                         __METHOD__,
2961                         [ 'FOR UPDATE' ]
2962                 );
2963         }
2964
2965         /**
2966          * Do some database updates after deletion
2967          *
2968          * @param int $id The page_id value of the page being deleted
2969          * @param Content|null $content Optional page content to be used when determining
2970          *   the required updates. This may be needed because $this->getContent()
2971          *   may already return null when the page proper was deleted.
2972          * @param Revision|null $revision The latest page revision
2973          */
2974         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
2975                 try {
2976                         $countable = $this->isCountable();
2977                 } catch ( Exception $ex ) {
2978                         // fallback for deleting broken pages for which we cannot load the content for
2979                         // some reason. Note that doDeleteArticleReal() already logged this problem.
2980                         $countable = false;
2981                 }
2982
2983                 // Update site status
2984                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
2985
2986                 // Delete pagelinks, update secondary indexes, etc
2987                 $updates = $this->getDeletionUpdates( $content );
2988                 foreach ( $updates as $update ) {
2989                         DeferredUpdates::addUpdate( $update );
2990                 }
2991
2992                 // Reparse any pages transcluding this page
2993                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2994
2995                 // Reparse any pages including this image
2996                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2997                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2998                 }
2999
3000                 // Clear caches
3001                 WikiPage::onArticleDelete( $this->mTitle );
3002                 ResourceLoaderWikiModule::invalidateModuleCache(
3003                         $this->mTitle, $revision, null, wfWikiID()
3004                 );
3005
3006                 // Reset this object and the Title object
3007                 $this->loadFromRow( false, self::READ_LATEST );
3008
3009                 // Search engine
3010                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3011         }
3012
3013         /**
3014          * Roll back the most recent consecutive set of edits to a page
3015          * from the same user; fails if there are no eligible edits to
3016          * roll back to, e.g. user is the sole contributor. This function
3017          * performs permissions checks on $user, then calls commitRollback()
3018          * to do the dirty work
3019          *
3020          * @todo Separate the business/permission stuff out from backend code
3021          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3022          *
3023          * @param string $fromP Name of the user whose edits to rollback.
3024          * @param string $summary Custom summary. Set to default summary if empty.
3025          * @param string $token Rollback token.
3026          * @param bool $bot If true, mark all reverted edits as bot.
3027          *
3028          * @param array $resultDetails Array contains result-specific array of additional values
3029          *    'alreadyrolled' : 'current' (rev)
3030          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3031          *
3032          * @param User $user The user performing the rollback
3033          * @param array|null $tags Change tags to apply to the rollback
3034          * Callers are responsible for permission checks
3035          * (with ChangeTags::canAddTagsAccompanyingChange)
3036          *
3037          * @return array Array of errors, each error formatted as
3038          *   array(messagekey, param1, param2, ...).
3039          * On success, the array is empty.  This array can also be passed to
3040          * OutputPage::showPermissionsErrorPage().
3041          */
3042         public function doRollback(
3043                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3044         ) {
3045                 $resultDetails = null;
3046
3047                 // Check permissions
3048                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3049                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3050                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3051
3052                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3053                         $errors[] = [ 'sessionfailure' ];
3054                 }
3055
3056                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3057                         $errors[] = [ 'actionthrottledtext' ];
3058                 }
3059
3060                 // If there were errors, bail out now
3061                 if ( !empty( $errors ) ) {
3062                         return $errors;
3063                 }
3064
3065                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3066         }
3067
3068         /**
3069          * Backend implementation of doRollback(), please refer there for parameter
3070          * and return value documentation
3071          *
3072          * NOTE: This function does NOT check ANY permissions, it just commits the
3073          * rollback to the DB. Therefore, you should only call this function direct-
3074          * ly if you want to use custom permissions checks. If you don't, use
3075          * doRollback() instead.
3076          * @param string $fromP Name of the user whose edits to rollback.
3077          * @param string $summary Custom summary. Set to default summary if empty.
3078          * @param bool $bot If true, mark all reverted edits as bot.
3079          *
3080          * @param array $resultDetails Contains result-specific array of additional values
3081          * @param User $guser The user performing the rollback
3082          * @param array|null $tags Change tags to apply to the rollback
3083          * Callers are responsible for permission checks
3084          * (with ChangeTags::canAddTagsAccompanyingChange)
3085          *
3086          * @return array
3087          */
3088         public function commitRollback( $fromP, $summary, $bot,
3089                 &$resultDetails, User $guser, $tags = null
3090         ) {
3091                 global $wgUseRCPatrol, $wgContLang;
3092
3093                 $dbw = wfGetDB( DB_MASTER );
3094
3095                 if ( wfReadOnly() ) {
3096                         return [ [ 'readonlytext' ] ];
3097                 }
3098
3099                 // Get the last editor
3100                 $current = $this->getRevision();
3101                 if ( is_null( $current ) ) {
3102                         // Something wrong... no page?
3103                         return [ [ 'notanarticle' ] ];
3104                 }
3105
3106                 $from = str_replace( '_', ' ', $fromP );
3107                 // User name given should match up with the top revision.
3108                 // If the user was deleted then $from should be empty.
3109                 if ( $from != $current->getUserText() ) {
3110                         $resultDetails = [ 'current' => $current ];
3111                         return [ [ 'alreadyrolled',
3112                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3113                                 htmlspecialchars( $fromP ),
3114                                 htmlspecialchars( $current->getUserText() )
3115                         ] ];
3116                 }
3117
3118                 // Get the last edit not by this person...
3119                 // Note: these may not be public values
3120                 $user = intval( $current->getUser( Revision::RAW ) );
3121                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3122                 $s = $dbw->selectRow( 'revision',
3123                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3124                         [ 'rev_page' => $current->getPage(),
3125                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3126                         ], __METHOD__,
3127                         [ 'USE INDEX' => 'page_timestamp',
3128                                 'ORDER BY' => 'rev_timestamp DESC' ]
3129                         );
3130                 if ( $s === false ) {
3131                         // No one else ever edited this page
3132                         return [ [ 'cantrollback' ] ];
3133                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3134                         || $s->rev_deleted & Revision::DELETED_USER
3135                 ) {
3136                         // Only admins can see this text
3137                         return [ [ 'notvisiblerev' ] ];
3138                 }
3139
3140                 // Generate the edit summary if necessary
3141                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3142                 if ( empty( $summary ) ) {
3143                         if ( $from == '' ) { // no public user name
3144                                 $summary = wfMessage( 'revertpage-nouser' );
3145                         } else {
3146                                 $summary = wfMessage( 'revertpage' );
3147                         }
3148                 }
3149
3150                 // Allow the custom summary to use the same args as the default message
3151                 $args = [
3152                         $target->getUserText(), $from, $s->rev_id,
3153                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3154                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3155                 ];
3156                 if ( $summary instanceof Message ) {
3157                         $summary = $summary->params( $args )->inContentLanguage()->text();
3158                 } else {
3159                         $summary = wfMsgReplaceArgs( $summary, $args );
3160                 }
3161
3162                 // Trim spaces on user supplied text
3163                 $summary = trim( $summary );
3164
3165                 // Truncate for whole multibyte characters.
3166                 $summary = $wgContLang->truncate( $summary, 255 );
3167
3168                 // Save
3169                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3170
3171                 if ( $guser->isAllowed( 'minoredit' ) ) {
3172                         $flags |= EDIT_MINOR;
3173                 }
3174
3175                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3176                         $flags |= EDIT_FORCE_BOT;
3177                 }
3178
3179                 $targetContent = $target->getContent();
3180                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3181
3182                 // Actually store the edit
3183                 $status = $this->doEditContent(
3184                         $targetContent,
3185                         $summary,
3186                         $flags,
3187                         $target->getId(),
3188                         $guser,
3189                         null,
3190                         $tags
3191                 );
3192
3193                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3194                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3195                 $set = [];
3196                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3197                         // Mark all reverted edits as bot
3198                         $set['rc_bot'] = 1;
3199                 }
3200
3201                 if ( $wgUseRCPatrol ) {
3202                         // Mark all reverted edits as patrolled
3203                         $set['rc_patrolled'] = 1;
3204                 }
3205
3206                 if ( count( $set ) ) {
3207                         $dbw->update( 'recentchanges', $set,
3208                                 [ /* WHERE */
3209                                         'rc_cur_id' => $current->getPage(),
3210                                         'rc_user_text' => $current->getUserText(),
3211                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3212                                 ],
3213                                 __METHOD__
3214                         );
3215                 }
3216
3217                 if ( !$status->isOK() ) {
3218                         return $status->getErrorsArray();
3219                 }
3220
3221                 // raise error, when the edit is an edit without a new version
3222                 $statusRev = isset( $status->value['revision'] )
3223                         ? $status->value['revision']
3224                         : null;
3225                 if ( !( $statusRev instanceof Revision ) ) {
3226                         $resultDetails = [ 'current' => $current ];
3227                         return [ [ 'alreadyrolled',
3228                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3229                                         htmlspecialchars( $fromP ),
3230                                         htmlspecialchars( $current->getUserText() )
3231                         ] ];
3232                 }
3233
3234                 if ( $changingContentModel ) {
3235                         // If the content model changed during the rollback,
3236                         // make sure it gets logged to Special:Log/contentmodel
3237                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3238                         $log->setPerformer( $guser );
3239                         $log->setTarget( $this->mTitle );
3240                         $log->setComment( $summary );
3241                         $log->setParameters( [
3242                                 '4::oldmodel' => $current->getContentModel(),
3243                                 '5::newmodel' => $targetContent->getModel(),
3244                         ] );
3245
3246                         $logId = $log->insert( $dbw );
3247                         $log->publish( $logId );
3248                 }
3249
3250                 $revId = $statusRev->getId();
3251
3252                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3253
3254                 $resultDetails = [
3255                         'summary' => $summary,
3256                         'current' => $current,
3257                         'target' => $target,
3258                         'newid' => $revId
3259                 ];
3260
3261                 return [];
3262         }
3263
3264         /**
3265          * The onArticle*() functions are supposed to be a kind of hooks
3266          * which should be called whenever any of the specified actions
3267          * are done.
3268          *
3269          * This is a good place to put code to clear caches, for instance.
3270          *
3271          * This is called on page move and undelete, as well as edit
3272          *
3273          * @param Title $title
3274          */
3275         public static function onArticleCreate( Title $title ) {
3276                 // Update existence markers on article/talk tabs...
3277                 $other = $title->getOtherPage();
3278
3279                 $other->purgeSquid();
3280
3281                 $title->touchLinks();
3282                 $title->purgeSquid();
3283                 $title->deleteTitleProtection();
3284
3285                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3286
3287                 if ( $title->getNamespace() == NS_CATEGORY ) {
3288                         // Load the Category object, which will schedule a job to create
3289                         // the category table row if necessary. Checking a replica DB is ok
3290                         // here, in the worst case it'll run an unnecessary recount job on
3291                         // a category that probably doesn't have many members.
3292                         Category::newFromTitle( $title )->getID();
3293                 }
3294         }
3295
3296         /**
3297          * Clears caches when article is deleted
3298          *
3299          * @param Title $title
3300          */
3301         public static function onArticleDelete( Title $title ) {
3302                 // Update existence markers on article/talk tabs...
3303                 $other = $title->getOtherPage();
3304
3305                 $other->purgeSquid();
3306
3307                 $title->touchLinks();
3308                 $title->purgeSquid();
3309
3310                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3311
3312                 // File cache
3313                 HTMLFileCache::clearFileCache( $title );
3314                 InfoAction::invalidateCache( $title );
3315
3316                 // Messages
3317                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3318                         MessageCache::singleton()->updateMessageOverride( $title, null );
3319                 }
3320
3321                 // Images
3322                 if ( $title->getNamespace() == NS_FILE ) {
3323                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3324                 }
3325
3326                 // User talk pages
3327                 if ( $title->getNamespace() == NS_USER_TALK ) {
3328                         $user = User::newFromName( $title->getText(), false );
3329                         if ( $user ) {
3330                                 $user->setNewtalk( false );
3331                         }
3332                 }
3333
3334                 // Image redirects
3335                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3336         }
3337
3338         /**
3339          * Purge caches on page update etc
3340          *
3341          * @param Title $title
3342          * @param Revision|null $revision Revision that was just saved, may be null
3343          */
3344         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3345                 // Invalidate caches of articles which include this page
3346                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3347
3348                 // Invalidate the caches of all pages which redirect here
3349                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3350
3351                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3352
3353                 // Purge CDN for this page only
3354                 $title->purgeSquid();
3355                 // Clear file cache for this page only
3356                 HTMLFileCache::clearFileCache( $title );
3357
3358                 $revid = $revision ? $revision->getId() : null;
3359                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3360                         InfoAction::invalidateCache( $title, $revid );
3361                 } );
3362         }
3363
3364         /**#@-*/
3365
3366         /**
3367          * Returns a list of categories this page is a member of.
3368          * Results will include hidden categories
3369          *
3370          * @return TitleArray
3371          */
3372         public function getCategories() {
3373                 $id = $this->getId();
3374                 if ( $id == 0 ) {
3375                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3376                 }
3377
3378                 $dbr = wfGetDB( DB_REPLICA );
3379                 $res = $dbr->select( 'categorylinks',
3380                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3381                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3382                         // as not being aliases, and NS_CATEGORY is numeric
3383                         [ 'cl_from' => $id ],
3384                         __METHOD__ );
3385
3386                 return TitleArray::newFromResult( $res );
3387         }
3388
3389         /**
3390          * Returns a list of hidden categories this page is a member of.
3391          * Uses the page_props and categorylinks tables.
3392          *
3393          * @return array Array of Title objects
3394          */
3395         public function getHiddenCategories() {
3396                 $result = [];
3397                 $id = $this->getId();
3398
3399                 if ( $id == 0 ) {
3400                         return [];
3401                 }
3402
3403                 $dbr = wfGetDB( DB_REPLICA );
3404                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3405                         [ 'cl_to' ],
3406                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3407                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3408                         __METHOD__ );
3409
3410                 if ( $res !== false ) {
3411                         foreach ( $res as $row ) {
3412                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3413                         }
3414                 }
3415
3416                 return $result;
3417         }
3418
3419         /**
3420          * Auto-generates a deletion reason
3421          *
3422          * @param bool &$hasHistory Whether the page has a history
3423          * @return string|bool String containing deletion reason or empty string, or boolean false
3424          *    if no revision occurred
3425          */
3426         public function getAutoDeleteReason( &$hasHistory ) {
3427                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3428         }
3429
3430         /**
3431          * Update all the appropriate counts in the category table, given that
3432          * we've added the categories $added and deleted the categories $deleted.
3433          *
3434          * This should only be called from deferred updates or jobs to avoid contention.
3435          *
3436          * @param array $added The names of categories that were added
3437          * @param array $deleted The names of categories that were deleted
3438          * @param integer $id Page ID (this should be the original deleted page ID)
3439          */
3440         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3441                 $id = $id ?: $this->getId();
3442                 $ns = $this->getTitle()->getNamespace();
3443
3444                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3445                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3446                 if ( $ns == NS_CATEGORY ) {
3447                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3448                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3449                 } elseif ( $ns == NS_FILE ) {
3450                         $addFields[] = 'cat_files = cat_files + 1';
3451                         $removeFields[] = 'cat_files = cat_files - 1';
3452                 }
3453
3454                 $dbw = wfGetDB( DB_MASTER );
3455
3456                 if ( count( $added ) ) {
3457                         $existingAdded = $dbw->selectFieldValues(
3458                                 'category',
3459                                 'cat_title',
3460                                 [ 'cat_title' => $added ],
3461                                 __METHOD__
3462                         );
3463
3464                         // For category rows that already exist, do a plain
3465                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3466                         // to avoid creating gaps in the cat_id sequence.
3467                         if ( count( $existingAdded ) ) {
3468                                 $dbw->update(
3469                                         'category',
3470                                         $addFields,
3471                                         [ 'cat_title' => $existingAdded ],
3472                                         __METHOD__
3473                                 );
3474                         }
3475
3476                         $missingAdded = array_diff( $added, $existingAdded );
3477                         if ( count( $missingAdded ) ) {
3478                                 $insertRows = [];
3479                                 foreach ( $missingAdded as $cat ) {
3480                                         $insertRows[] = [
3481                                                 'cat_title'   => $cat,
3482                                                 'cat_pages'   => 1,
3483                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3484                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3485                                         ];
3486                                 }
3487                                 $dbw->upsert(
3488                                         'category',
3489                                         $insertRows,
3490                                         [ 'cat_title' ],
3491                                         $addFields,
3492                                         __METHOD__
3493                                 );
3494                         }
3495                 }
3496
3497                 if ( count( $deleted ) ) {
3498                         $dbw->update(
3499                                 'category',
3500                                 $removeFields,
3501                                 [ 'cat_title' => $deleted ],
3502                                 __METHOD__
3503                         );
3504                 }
3505
3506                 foreach ( $added as $catName ) {
3507                         $cat = Category::newFromName( $catName );
3508                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3509                 }
3510
3511                 foreach ( $deleted as $catName ) {
3512                         $cat = Category::newFromName( $catName );
3513                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3514                 }
3515
3516                 // Refresh counts on categories that should be empty now, to
3517                 // trigger possible deletion. Check master for the most
3518                 // up-to-date cat_pages.
3519                 if ( count( $deleted ) ) {
3520                         $rows = $dbw->select(
3521                                 'category',
3522                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3523                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3524                                 __METHOD__
3525                         );
3526                         foreach ( $rows as $row ) {
3527                                 $cat = Category::newFromRow( $row );
3528                                 $cat->refreshCounts();
3529                         }
3530                 }
3531         }
3532
3533         /**
3534          * Opportunistically enqueue link update jobs given fresh parser output if useful
3535          *
3536          * @param ParserOutput $parserOutput Current version page output
3537          * @since 1.25
3538          */
3539         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3540                 if ( wfReadOnly() ) {
3541                         return;
3542                 }
3543
3544                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3545                         [ $this, $this->mTitle, $parserOutput ]
3546                 ) ) {
3547                         return;
3548                 }
3549
3550                 $config = RequestContext::getMain()->getConfig();
3551
3552                 $params = [
3553                         'isOpportunistic' => true,
3554                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3555                 ];
3556
3557                 if ( $this->mTitle->areRestrictionsCascading() ) {
3558                         // If the page is cascade protecting, the links should really be up-to-date
3559                         JobQueueGroup::singleton()->lazyPush(
3560                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3561                         );
3562                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3563                         // Assume the output contains "dynamic" time/random based magic words.
3564                         // Only update pages that expired due to dynamic content and NOT due to edits
3565                         // to referenced templates/files. When the cache expires due to dynamic content,
3566                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3567                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3568                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3569                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3570                                 // If a page is uncacheable, do not keep spamming a job for it.
3571                                 // Although it would be de-duplicated, it would still waste I/O.
3572                                 $cache = ObjectCache::getLocalClusterInstance();
3573                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3574                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3575                                 if ( $cache->add( $key, time(), $ttl ) ) {
3576                                         JobQueueGroup::singleton()->lazyPush(
3577                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3578                                         );
3579                                 }
3580                         }
3581                 }
3582         }
3583
3584         /**
3585          * Returns a list of updates to be performed when this page is deleted. The
3586          * updates should remove any information about this page from secondary data
3587          * stores such as links tables.
3588          *
3589          * @param Content|null $content Optional Content object for determining the
3590          *   necessary updates.
3591          * @return DeferrableUpdate[]
3592          */
3593         public function getDeletionUpdates( Content $content = null ) {
3594                 if ( !$content ) {
3595                         // load content object, which may be used to determine the necessary updates.
3596                         // XXX: the content may not be needed to determine the updates.
3597                         try {
3598                                 $content = $this->getContent( Revision::RAW );
3599                         } catch ( Exception $ex ) {
3600                                 // If we can't load the content, something is wrong. Perhaps that's why
3601                                 // the user is trying to delete the page, so let's not fail in that case.
3602                                 // Note that doDeleteArticleReal() will already have logged an issue with
3603                                 // loading the content.
3604                         }
3605                 }
3606
3607                 if ( !$content ) {
3608                         $updates = [];
3609                 } else {
3610                         $updates = $content->getDeletionUpdates( $this );
3611                 }
3612
3613                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3614                 return $updates;
3615         }
3616
3617         /**
3618          * Whether this content displayed on this page
3619          * comes from the local database
3620          *
3621          * @since 1.28
3622          * @return bool
3623          */
3624         public function isLocal() {
3625                 return true;
3626         }
3627
3628         /**
3629          * The display name for the site this content
3630          * come from. If a subclass overrides isLocal(),
3631          * this could return something other than the
3632          * current site name
3633          *
3634          * @since 1.28
3635          * @return string
3636          */
3637         public function getWikiDisplayName() {
3638                 global $wgSitename;
3639                 return $wgSitename;
3640         }
3641
3642         /**
3643          * Get the source URL for the content on this page,
3644          * typically the canonical URL, but may be a remote
3645          * link if the content comes from another site
3646          *
3647          * @since 1.28
3648          * @return string
3649          */
3650         public function getSourceURL() {
3651                 return $this->getTitle()->getCanonicalURL();
3652         }
3653
3654         /*
3655          * @param WANObjectCache $cache
3656          * @return string[]
3657          * @since 1.28
3658          */
3659         public function getMutableCacheKeys( WANObjectCache $cache ) {
3660                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3661
3662                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3663         }
3664 }