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                 $fields = self::selectFields();
 318
 319                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 320
 321                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 322
 323                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 324
 325                 return $row;
 326         }
 327
 328         /**
 329          * Fetch a page record matching the Title object's namespace and title
 330          * using a sanitized title string
 331          *
 332          * @param IDatabase $dbr
 333          * @param Title $title
 334          * @param array $options
 335          * @return object|bool Database result resource, or false on failure
 336          */
 337         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 338                 return $this->pageData( $dbr, [
 339                         'page_namespace' => $title->getNamespace(),
 340                         'page_title' => $title->getDBkey() ], $options );
 341         }
 342
 343         /**
 344          * Fetch a page record matching the requested ID
 345          *
 346          * @param IDatabase $dbr
 347          * @param int $id
 348          * @param array $options
 349          * @return object|bool Database result resource, or false on failure
 350          */
 351         public function pageDataFromId( $dbr, $id, $options = [] ) {
 352                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 353         }
 354
 355         /**
 356          * Load the object from a given source by title
 357          *
 358          * @param object|string|int $from One of the following:
 359          *   - A DB query result object.
 360          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 361          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 362          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 363          *     using SELECT FOR UPDATE.
 364          *
 365          * @return void
 366          */
 367         public function loadPageData( $from = 'fromdb' ) {
 368                 $from = self::convertSelectType( $from );
 369                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 370                         // We already have the data from the correct location, no need to load it twice.
 371                         return;
 372                 }
 373
 374                 if ( is_int( $from ) ) {
 375                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 376                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 377
 378                         if ( !$data
 379                                 && $index == DB_REPLICA
 380                                 && wfGetLB()->getServerCount() > 1
 381                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 382                         ) {
 383                                 $from = self::READ_LATEST;
 384                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 385                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 386                         }
 387                 } else {
 388                         // No idea from where the caller got this data, assume replica DB.
 389                         $data = $from;
 390                         $from = self::READ_NORMAL;
 391                 }
 392
 393                 $this->loadFromRow( $data, $from );
 394         }
 395
 396         /**
 397          * Load the object from a database row
 398          *
 399          * @since 1.20
 400          * @param object|bool $data DB row containing fields returned by selectFields() or false
 401          * @param string|int $from One of the following:
 402          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 403          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 404          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 405          *          the master DB using SELECT FOR UPDATE
 406          */
 407         public function loadFromRow( $data, $from ) {
 408                 $lc = LinkCache::singleton();
 409                 $lc->clearLink( $this->mTitle );
 410
 411                 if ( $data ) {
 412                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 413
 414                         $this->mTitle->loadFromRow( $data );
 415
 416                         // Old-fashioned restrictions
 417                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 418
 419                         $this->mId = intval( $data->page_id );
 420                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 421                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 422                         $this->mIsRedirect = intval( $data->page_is_redirect );
 423                         $this->mLatest = intval( $data->page_latest );
 424                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 425                         // Double-check the ID of any cached latest Revision object for consistency.
 426                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 427                                 $this->mLastRevision = null;
 428                                 $this->mTimestamp = '';
 429                         }
 430                 } else {
 431                         $lc->addBadLinkObj( $this->mTitle );
 432
 433                         $this->mTitle->loadFromRow( false );
 434
 435                         $this->clearCacheFields();
 436
 437                         $this->mId = 0;
 438                 }
 439
 440                 $this->mDataLoaded = true;
 441                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 442         }
 443
 444         /**
 445          * @return int Page ID
 446          */
 447         public function getId() {
 448                 if ( !$this->mDataLoaded ) {
 449                         $this->loadPageData();
 450                 }
 451                 return $this->mId;
 452         }
 453
 454         /**
 455          * @return bool Whether or not the page exists in the database
 456          */
 457         public function exists() {
 458                 if ( !$this->mDataLoaded ) {
 459                         $this->loadPageData();
 460                 }
 461                 return $this->mId > 0;
 462         }
 463
 464         /**
 465          * Check if this page is something we're going to be showing
 466          * some sort of sensible content for. If we return false, page
 467          * views (plain action=view) will return an HTTP 404 response,
 468          * so spiders and robots can know they're following a bad link.
 469          *
 470          * @return bool
 471          */
 472         public function hasViewableContent() {
 473                 return $this->mTitle->isKnown();
 474         }
 475
 476         /**
 477          * Tests if the article content represents a redirect
 478          *
 479          * @return bool
 480          */
 481         public function isRedirect() {
 482                 if ( !$this->mDataLoaded ) {
 483                         $this->loadPageData();
 484                 }
 485
 486                 return (bool)$this->mIsRedirect;
 487         }
 488
 489         /**
 490          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 491          *
 492          * Will use the revisions actual content model if the page exists,
 493          * and the page's default if the page doesn't exist yet.
 494          *
 495          * @return string
 496          *
 497          * @since 1.21
 498          */
 499         public function getContentModel() {
 500                 if ( $this->exists() ) {
 501                         $cache = ObjectCache::getMainWANInstance();
 502
 503                         return $cache->getWithSetCallback(
 504                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 505                                 $cache::TTL_MONTH,
 506                                 function () {
 507                                         $rev = $this->getRevision();
 508                                         if ( $rev ) {
 509                                                 // Look at the revision's actual content model
 510                                                 return $rev->getContentModel();
 511                                         } else {
 512                                                 $title = $this->mTitle->getPrefixedDBkey();
 513                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 514                                                 return $this->mTitle->getContentModel();
 515                                         }
 516                                 }
 517                         );
 518                 }
 519
 520                 // use the default model for this page
 521                 return $this->mTitle->getContentModel();
 522         }
 523
 524         /**
 525          * Loads page_touched and returns a value indicating if it should be used
 526          * @return bool True if this page exists and is not a redirect
 527          */
 528         public function checkTouched() {
 529                 if ( !$this->mDataLoaded ) {
 530                         $this->loadPageData();
 531                 }
 532                 return ( $this->mId && !$this->mIsRedirect );
 533         }
 534
 535         /**
 536          * Get the page_touched field
 537          * @return string Containing GMT timestamp
 538          */
 539         public function getTouched() {
 540                 if ( !$this->mDataLoaded ) {
 541                         $this->loadPageData();
 542                 }
 543                 return $this->mTouched;
 544         }
 545
 546         /**
 547          * Get the page_links_updated field
 548          * @return string|null Containing GMT timestamp
 549          */
 550         public function getLinksTimestamp() {
 551                 if ( !$this->mDataLoaded ) {
 552                         $this->loadPageData();
 553                 }
 554                 return $this->mLinksUpdated;
 555         }
 556
 557         /**
 558          * Get the page_latest field
 559          * @return int The rev_id of current revision
 560          */
 561         public function getLatest() {
 562                 if ( !$this->mDataLoaded ) {
 563                         $this->loadPageData();
 564                 }
 565                 return (int)$this->mLatest;
 566         }
 567
 568         /**
 569          * Get the Revision object of the oldest revision
 570          * @return Revision|null
 571          */
 572         public function getOldestRevision() {
 573
 574                 // Try using the replica DB first, then try the master
 575                 $continue = 2;
 576                 $db = wfGetDB( DB_REPLICA );
 577                 $revSelectFields = Revision::selectFields();
 578
 579                 $row = null;
 580                 while ( $continue ) {
 581                         $row = $db->selectRow(
 582                                 [ 'page', 'revision' ],
 583                                 $revSelectFields,
 584                                 [
 585                                         'page_namespace' => $this->mTitle->getNamespace(),
 586                                         'page_title' => $this->mTitle->getDBkey(),
 587                                         'rev_page = page_id'
 588                                 ],
 589                                 __METHOD__,
 590                                 [
 591                                         'ORDER BY' => 'rev_timestamp ASC'
 592                                 ]
 593                         );
 594
 595                         if ( $row ) {
 596                                 $continue = 0;
 597                         } else {
 598                                 $db = wfGetDB( DB_MASTER );
 599                                 $continue--;
 600                         }
 601                 }
 602
 603                 return $row ? Revision::newFromRow( $row ) : null;
 604         }
 605
 606         /**
 607          * Loads everything except the text
 608          * This isn't necessary for all uses, so it's only done if needed.
 609          */
 610         protected function loadLastEdit() {
 611                 if ( $this->mLastRevision !== null ) {
 612                         return; // already loaded
 613                 }
 614
 615                 $latest = $this->getLatest();
 616                 if ( !$latest ) {
 617                         return; // page doesn't exist or is missing page_latest info
 618                 }
 619
 620                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 621                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 622                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 623                         // transactions, where S1 normally only sees changes committed before the first S1
 624                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 625                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 626                         // happened after the first S1 SELECT.
 627                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 628                         $flags = Revision::READ_LOCKING;
 629                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 630                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 631                         // Bug T93976: if page_latest was loaded from the master, fetch the
 632                         // revision from there as well, as it may not exist yet on a replica DB.
 633                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 634                         $flags = Revision::READ_LATEST;
 635                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 636                 } else {
 637                         $dbr = wfGetDB( DB_REPLICA );
 638                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 639                 }
 640
 641                 if ( $revision ) { // sanity
 642                         $this->setLastEdit( $revision );
 643                 }
 644         }
 645
 646         /**
 647          * Set the latest revision
 648          * @param Revision $revision
 649          */
 650         protected function setLastEdit( Revision $revision ) {
 651                 $this->mLastRevision = $revision;
 652                 $this->mTimestamp = $revision->getTimestamp();
 653         }
 654
 655         /**
 656          * Get the latest revision
 657          * @return Revision|null
 658          */
 659         public function getRevision() {
 660                 $this->loadLastEdit();
 661                 if ( $this->mLastRevision ) {
 662                         return $this->mLastRevision;
 663                 }
 664                 return null;
 665         }
 666
 667         /**
 668          * Get the content of the current revision. No side-effects...
 669          *
 670          * @param int $audience One of:
 671          *   Revision::FOR_PUBLIC       to be displayed to all users
 672          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 673          *   Revision::RAW              get the text regardless of permissions
 674          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 675          *   to the $audience parameter
 676          * @return Content|null The content of the current revision
 677          *
 678          * @since 1.21
 679          */
 680         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 681                 $this->loadLastEdit();
 682                 if ( $this->mLastRevision ) {
 683                         return $this->mLastRevision->getContent( $audience, $user );
 684                 }
 685                 return null;
 686         }
 687
 688         /**
 689          * @return string MW timestamp of last article revision
 690          */
 691         public function getTimestamp() {
 692                 // Check if the field has been filled by WikiPage::setTimestamp()
 693                 if ( !$this->mTimestamp ) {
 694                         $this->loadLastEdit();
 695                 }
 696
 697                 return wfTimestamp( TS_MW, $this->mTimestamp );
 698         }
 699
 700         /**
 701          * Set the page timestamp (use only to avoid DB queries)
 702          * @param string $ts MW timestamp of last article revision
 703          * @return void
 704          */
 705         public function setTimestamp( $ts ) {
 706                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 707         }
 708
 709         /**
 710          * @param int $audience One of:
 711          *   Revision::FOR_PUBLIC       to be displayed to all users
 712          *   Revision::FOR_THIS_USER    to be displayed to the given user
 713          *   Revision::RAW              get the text regardless of permissions
 714          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 715          *   to the $audience parameter
 716          * @return int User ID for the user that made the last article revision
 717          */
 718         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 719                 $this->loadLastEdit();
 720                 if ( $this->mLastRevision ) {
 721                         return $this->mLastRevision->getUser( $audience, $user );
 722                 } else {
 723                         return -1;
 724                 }
 725         }
 726
 727         /**
 728          * Get the User object of the user who created the page
 729          * @param int $audience One of:
 730          *   Revision::FOR_PUBLIC       to be displayed to all users
 731          *   Revision::FOR_THIS_USER    to be displayed to the given user
 732          *   Revision::RAW              get the text regardless of permissions
 733          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 734          *   to the $audience parameter
 735          * @return User|null
 736          */
 737         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 738                 $revision = $this->getOldestRevision();
 739                 if ( $revision ) {
 740                         $userName = $revision->getUserText( $audience, $user );
 741                         return User::newFromName( $userName, false );
 742                 } else {
 743                         return null;
 744                 }
 745         }
 746
 747         /**
 748          * @param int $audience One of:
 749          *   Revision::FOR_PUBLIC       to be displayed to all users
 750          *   Revision::FOR_THIS_USER    to be displayed to the given user
 751          *   Revision::RAW              get the text regardless of permissions
 752          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 753          *   to the $audience parameter
 754          * @return string Username of the user that made the last article revision
 755          */
 756         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 757                 $this->loadLastEdit();
 758                 if ( $this->mLastRevision ) {
 759                         return $this->mLastRevision->getUserText( $audience, $user );
 760                 } else {
 761                         return '';
 762                 }
 763         }
 764
 765         /**
 766          * @param int $audience One of:
 767          *   Revision::FOR_PUBLIC       to be displayed to all users
 768          *   Revision::FOR_THIS_USER    to be displayed to the given user
 769          *   Revision::RAW              get the text regardless of permissions
 770          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 771          *   to the $audience parameter
 772          * @return string Comment stored for the last article revision
 773          */
 774         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 775                 $this->loadLastEdit();
 776                 if ( $this->mLastRevision ) {
 777                         return $this->mLastRevision->getComment( $audience, $user );
 778                 } else {
 779                         return '';
 780                 }
 781         }
 782
 783         /**
 784          * Returns true if last revision was marked as "minor edit"
 785          *
 786          * @return bool Minor edit indicator for the last article revision.
 787          */
 788         public function getMinorEdit() {
 789                 $this->loadLastEdit();
 790                 if ( $this->mLastRevision ) {
 791                         return $this->mLastRevision->isMinor();
 792                 } else {
 793                         return false;
 794                 }
 795         }
 796
 797         /**
 798          * Determine whether a page would be suitable for being counted as an
 799          * article in the site_stats table based on the title & its content
 800          *
 801          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 802          *   if false, the current database state will be used
 803          * @return bool
 804          */
 805         public function isCountable( $editInfo = false ) {
 806                 global $wgArticleCountMethod;
 807
 808                 if ( !$this->mTitle->isContentPage() ) {
 809                         return false;
 810                 }
 811
 812                 if ( $editInfo ) {
 813                         $content = $editInfo->pstContent;
 814                 } else {
 815                         $content = $this->getContent();
 816                 }
 817
 818                 if ( !$content || $content->isRedirect() ) {
 819                         return false;
 820                 }
 821
 822                 $hasLinks = null;
 823
 824                 if ( $wgArticleCountMethod === 'link' ) {
 825                         // nasty special case to avoid re-parsing to detect links
 826
 827                         if ( $editInfo ) {
 828                                 // ParserOutput::getLinks() is a 2D array of page links, so
 829                                 // to be really correct we would need to recurse in the array
 830                                 // but the main array should only have items in it if there are
 831                                 // links.
 832                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 833                         } else {
 834                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 835                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 836                         }
 837                 }
 838
 839                 return $content->isCountable( $hasLinks );
 840         }
 841
 842         /**
 843          * If this page is a redirect, get its target
 844          *
 845          * The target will be fetched from the redirect table if possible.
 846          * If this page doesn't have an entry there, call insertRedirect()
 847          * @return Title|null Title object, or null if this page is not a redirect
 848          */
 849         public function getRedirectTarget() {
 850                 if ( !$this->mTitle->isRedirect() ) {
 851                         return null;
 852                 }
 853
 854                 if ( $this->mRedirectTarget !== null ) {
 855                         return $this->mRedirectTarget;
 856                 }
 857
 858                 // Query the redirect table
 859                 $dbr = wfGetDB( DB_REPLICA );
 860                 $row = $dbr->selectRow( 'redirect',
 861                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 862                         [ 'rd_from' => $this->getId() ],
 863                         __METHOD__
 864                 );
 865
 866                 // rd_fragment and rd_interwiki were added later, populate them if empty
 867                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 868                         $this->mRedirectTarget = Title::makeTitle(
 869                                 $row->rd_namespace, $row->rd_title,
 870                                 $row->rd_fragment, $row->rd_interwiki
 871                         );
 872                         return $this->mRedirectTarget;
 873                 }
 874
 875                 // This page doesn't have an entry in the redirect table
 876                 $this->mRedirectTarget = $this->insertRedirect();
 877                 return $this->mRedirectTarget;
 878         }
 879
 880         /**
 881          * Insert an entry for this page into the redirect table if the content is a redirect
 882          *
 883          * The database update will be deferred via DeferredUpdates
 884          *
 885          * Don't call this function directly unless you know what you're doing.
 886          * @return Title|null Title object or null if not a redirect
 887          */
 888         public function insertRedirect() {
 889                 $content = $this->getContent();
 890                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 891                 if ( !$retval ) {
 892                         return null;
 893                 }
 894
 895                 // Update the DB post-send if the page has not cached since now
 896                 $that = $this;
 897                 $latest = $this->getLatest();
 898                 DeferredUpdates::addCallableUpdate(
 899                         function () use ( $that, $retval, $latest ) {
 900                                 $that->insertRedirectEntry( $retval, $latest );
 901                         },
 902                         DeferredUpdates::POSTSEND,
 903                         wfGetDB( DB_MASTER )
 904                 );
 905
 906                 return $retval;
 907         }
 908
 909         /**
 910          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 911          * @param Title $rt Redirect target
 912          * @param int|null $oldLatest Prior page_latest for check and set
 913          */
 914         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 915                 $dbw = wfGetDB( DB_MASTER );
 916                 $dbw->startAtomic( __METHOD__ );
 917
 918                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 919                         $dbw->upsert(
 920                                 'redirect',
 921                                 [
 922                                         'rd_from' => $this->getId(),
 923                                         'rd_namespace' => $rt->getNamespace(),
 924                                         'rd_title' => $rt->getDBkey(),
 925                                         'rd_fragment' => $rt->getFragment(),
 926                                         'rd_interwiki' => $rt->getInterwiki(),
 927                                 ],
 928                                 [ 'rd_from' ],
 929                                 [
 930                                         'rd_namespace' => $rt->getNamespace(),
 931                                         'rd_title' => $rt->getDBkey(),
 932                                         'rd_fragment' => $rt->getFragment(),
 933                                         'rd_interwiki' => $rt->getInterwiki(),
 934                                 ],
 935                                 __METHOD__
 936                         );
 937                 }
 938
 939                 $dbw->endAtomic( __METHOD__ );
 940         }
 941
 942         /**
 943          * Get the Title object or URL this page redirects to
 944          *
 945          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 946          */
 947         public function followRedirect() {
 948                 return $this->getRedirectURL( $this->getRedirectTarget() );
 949         }
 950
 951         /**
 952          * Get the Title object or URL to use for a redirect. We use Title
 953          * objects for same-wiki, non-special redirects and URLs for everything
 954          * else.
 955          * @param Title $rt Redirect target
 956          * @return bool|Title|string False, Title object of local target, or string with URL
 957          */
 958         public function getRedirectURL( $rt ) {
 959                 if ( !$rt ) {
 960                         return false;
 961                 }
 962
 963                 if ( $rt->isExternal() ) {
 964                         if ( $rt->isLocal() ) {
 965                                 // Offsite wikis need an HTTP redirect.
 966                                 // This can be hard to reverse and may produce loops,
 967                                 // so they may be disabled in the site configuration.
 968                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 969                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 970                         } else {
 971                                 // External pages without "local" bit set are not valid
 972                                 // redirect targets
 973                                 return false;
 974                         }
 975                 }
 976
 977                 if ( $rt->isSpecialPage() ) {
 978                         // Gotta handle redirects to special pages differently:
 979                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 980                         // Some pages are not valid targets.
 981                         if ( $rt->isValidRedirectTarget() ) {
 982                                 return $rt->getFullURL();
 983                         } else {
 984                                 return false;
 985                         }
 986                 }
 987
 988                 return $rt;
 989         }
 990
 991         /**
 992          * Get a list of users who have edited this article, not including the user who made
 993          * the most recent revision, which you can get from $article->getUser() if you want it
 994          * @return UserArrayFromResult
 995          */
 996         public function getContributors() {
 997                 // @todo FIXME: This is expensive; cache this info somewhere.
 998
 999                 $dbr = wfGetDB( DB_REPLICA );
1000
1001                 if ( $dbr->implicitGroupby() ) {
1002                         $realNameField = 'user_real_name';
1003                 } else {
1004                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1005                 }
1006
1007                 $tables = [ 'revision', 'user' ];
1008
1009                 $fields = [
1010                         'user_id' => 'rev_user',
1011                         'user_name' => 'rev_user_text',
1012                         $realNameField,
1013                         'timestamp' => 'MAX(rev_timestamp)',
1014                 ];
1015
1016                 $conds = [ 'rev_page' => $this->getId() ];
1017
1018                 // The user who made the top revision gets credited as "this page was last edited by
1019                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1020                 $user = $this->getUser();
1021                 if ( $user ) {
1022                         $conds[] = "rev_user != $user";
1023                 } else {
1024                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1025                 }
1026
1027                 // Username hidden?
1028                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1029
1030                 $jconds = [
1031                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1032                 ];
1033
1034                 $options = [
1035                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1036                         'ORDER BY' => 'timestamp DESC',
1037                 ];
1038
1039                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1040                 return new UserArrayFromResult( $res );
1041         }
1042
1043         /**
1044          * Should the parser cache be used?
1045          *
1046          * @param ParserOptions $parserOptions ParserOptions to check
1047          * @param int $oldId
1048          * @return bool
1049          */
1050         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1051                 return $parserOptions->getStubThreshold() == 0
1052                         && $this->exists()
1053                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1054                         && $this->getContentHandler()->isParserCacheSupported();
1055         }
1056
1057         /**
1058          * Get a ParserOutput for the given ParserOptions and revision ID.
1059          *
1060          * The parser cache will be used if possible. Cache misses that result
1061          * in parser runs are debounced with PoolCounter.
1062          *
1063          * @since 1.19
1064          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1065          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1066          *                             get the current revision (default value)
1067          * @param bool          $forceParse Force reindexing, regardless of cache settings
1068          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1069          */
1070         public function getParserOutput(
1071                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1072         ) {
1073                 $useParserCache =
1074                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1075                 wfDebug( __METHOD__ .
1076                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1077                 if ( $parserOptions->getStubThreshold() ) {
1078                         wfIncrStats( 'pcache.miss.stub' );
1079                 }
1080
1081                 if ( $useParserCache ) {
1082                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1083                         if ( $parserOutput !== false ) {
1084                                 return $parserOutput;
1085                         }
1086                 }
1087
1088                 if ( $oldid === null || $oldid === 0 ) {
1089                         $oldid = $this->getLatest();
1090                 }
1091
1092                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1093                 $pool->execute();
1094
1095                 return $pool->getParserOutput();
1096         }
1097
1098         /**
1099          * Do standard deferred updates after page view (existing or missing page)
1100          * @param User $user The relevant user
1101          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1102          */
1103         public function doViewUpdates( User $user, $oldid = 0 ) {
1104                 if ( wfReadOnly() ) {
1105                         return;
1106                 }
1107
1108                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1109                 // Update newtalk / watchlist notification status
1110                 try {
1111                         $user->clearNotification( $this->mTitle, $oldid );
1112                 } catch ( DBError $e ) {
1113                         // Avoid outage if the master is not reachable
1114                         MWExceptionHandler::logException( $e );
1115                 }
1116         }
1117
1118         /**
1119          * Perform the actions of a page purging
1120          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1121          * @return bool
1122          */
1123         public function doPurge( $flags = self::PURGE_ALL ) {
1124                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1125                         return false;
1126                 }
1127
1128                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1129                         // Set page_touched in the database to invalidate all DC caches
1130                         $this->mTitle->invalidateCache();
1131                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1132                         // Delete the parser options key in the local cluster to invalidate the DC cache
1133                         ParserCache::singleton()->deleteOptionsKey( $this );
1134                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1135                         $cache = ObjectCache::getLocalClusterInstance();
1136                         $cache->set(
1137                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1138                                 wfTimestamp( TS_MW ),
1139                                 $cache::TTL_HOUR
1140                         );
1141                 }
1142
1143                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1144                         // Clear any HTML file cache
1145                         HTMLFileCache::clearFileCache( $this->getTitle() );
1146                         // Send purge after any page_touched above update was committed
1147                         DeferredUpdates::addUpdate(
1148                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1149                                 DeferredUpdates::PRESEND
1150                         );
1151                 }
1152
1153                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1154                         // @todo move this logic to MessageCache
1155                         if ( $this->exists() ) {
1156                                 // NOTE: use transclusion text for messages.
1157                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1158
1159                                 $content = $this->getContent();
1160                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1161
1162                                 if ( $text === null ) {
1163                                         $text = false;
1164                                 }
1165                         } else {
1166                                 $text = false;
1167                         }
1168
1169                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1170                 }
1171
1172                 return true;
1173         }
1174
1175         /**
1176          * Get the last time a user explicitly purged the page via action=purge
1177          *
1178          * @return string|bool TS_MW timestamp or false
1179          * @since 1.28
1180          */
1181         public function getLastPurgeTimestamp() {
1182                 $cache = ObjectCache::getLocalClusterInstance();
1183
1184                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1185         }
1186
1187         /**
1188          * Insert a new empty page record for this article.
1189          * This *must* be followed up by creating a revision
1190          * and running $this->updateRevisionOn( ... );
1191          * or else the record will be left in a funky state.
1192          * Best if all done inside a transaction.
1193          *
1194          * @param IDatabase $dbw
1195          * @param int|null $pageId Custom page ID that will be used for the insert statement
1196          *
1197          * @return bool|int The newly created page_id key; false if the row was not
1198          *   inserted, e.g. because the title already existed or because the specified
1199          *   page ID is already in use.
1200          */
1201         public function insertOn( $dbw, $pageId = null ) {
1202                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1203                 $dbw->insert(
1204                         'page',
1205                         [
1206                                 'page_id'           => $pageIdForInsert,
1207                                 'page_namespace'    => $this->mTitle->getNamespace(),
1208                                 'page_title'        => $this->mTitle->getDBkey(),
1209                                 'page_restrictions' => '',
1210                                 'page_is_redirect'  => 0, // Will set this shortly...
1211                                 'page_is_new'       => 1,
1212                                 'page_random'       => wfRandom(),
1213                                 'page_touched'      => $dbw->timestamp(),
1214                                 'page_latest'       => 0, // Fill this in shortly...
1215                                 'page_len'          => 0, // Fill this in shortly...
1216                         ],
1217                         __METHOD__,
1218                         'IGNORE'
1219                 );
1220
1221                 if ( $dbw->affectedRows() > 0 ) {
1222                         $newid = $pageId ?: $dbw->insertId();
1223                         $this->mId = $newid;
1224                         $this->mTitle->resetArticleID( $newid );
1225
1226                         return $newid;
1227                 } else {
1228                         return false; // nothing changed
1229                 }
1230         }
1231
1232         /**
1233          * Update the page record to point to a newly saved revision.
1234          *
1235          * @param IDatabase $dbw
1236          * @param Revision $revision For ID number, and text used to set
1237          *   length and redirect status fields
1238          * @param int $lastRevision If given, will not overwrite the page field
1239          *   when different from the currently set value.
1240          *   Giving 0 indicates the new page flag should be set on.
1241          * @param bool $lastRevIsRedirect If given, will optimize adding and
1242          *   removing rows in redirect table.
1243          * @return bool Success; false if the page row was missing or page_latest changed
1244          */
1245         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1246                 $lastRevIsRedirect = null
1247         ) {
1248                 global $wgContentHandlerUseDB;
1249
1250                 // Assertion to try to catch T92046
1251                 if ( (int)$revision->getId() === 0 ) {
1252                         throw new InvalidArgumentException(
1253                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1254                         );
1255                 }
1256
1257                 $content = $revision->getContent();
1258                 $len = $content ? $content->getSize() : 0;
1259                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1260
1261                 $conditions = [ 'page_id' => $this->getId() ];
1262
1263                 if ( !is_null( $lastRevision ) ) {
1264                         // An extra check against threads stepping on each other
1265                         $conditions['page_latest'] = $lastRevision;
1266                 }
1267
1268                 $row = [ /* SET */
1269                         'page_latest'      => $revision->getId(),
1270                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1271                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1272                         'page_is_redirect' => $rt !== null ? 1 : 0,
1273                         'page_len'         => $len,
1274                 ];
1275
1276                 if ( $wgContentHandlerUseDB ) {
1277                         $row['page_content_model'] = $revision->getContentModel();
1278                 }
1279
1280                 $dbw->update( 'page',
1281                         $row,
1282                         $conditions,
1283                         __METHOD__ );
1284
1285                 $result = $dbw->affectedRows() > 0;
1286                 if ( $result ) {
1287                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1288                         $this->setLastEdit( $revision );
1289                         $this->mLatest = $revision->getId();
1290                         $this->mIsRedirect = (bool)$rt;
1291                         // Update the LinkCache.
1292                         LinkCache::singleton()->addGoodLinkObj(
1293                                 $this->getId(),
1294                                 $this->mTitle,
1295                                 $len,
1296                                 $this->mIsRedirect,
1297                                 $this->mLatest,
1298                                 $revision->getContentModel()
1299                         );
1300                 }
1301
1302                 return $result;
1303         }
1304
1305         /**
1306          * Add row to the redirect table if this is a redirect, remove otherwise.
1307          *
1308          * @param IDatabase $dbw
1309          * @param Title $redirectTitle Title object pointing to the redirect target,
1310          *   or NULL if this is not a redirect
1311          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1312          *   removing rows in redirect table.
1313          * @return bool True on success, false on failure
1314          * @private
1315          */
1316         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1317                 // Always update redirects (target link might have changed)
1318                 // Update/Insert if we don't know if the last revision was a redirect or not
1319                 // Delete if changing from redirect to non-redirect
1320                 $isRedirect = !is_null( $redirectTitle );
1321
1322                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1323                         return true;
1324                 }
1325
1326                 if ( $isRedirect ) {
1327                         $this->insertRedirectEntry( $redirectTitle );
1328                 } else {
1329                         // This is not a redirect, remove row from redirect table
1330                         $where = [ 'rd_from' => $this->getId() ];
1331                         $dbw->delete( 'redirect', $where, __METHOD__ );
1332                 }
1333
1334                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1335                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1336                 }
1337
1338                 return ( $dbw->affectedRows() != 0 );
1339         }
1340
1341         /**
1342          * If the given revision is newer than the currently set page_latest,
1343          * update the page record. Otherwise, do nothing.
1344          *
1345          * @deprecated since 1.24, use updateRevisionOn instead
1346          *
1347          * @param IDatabase $dbw
1348          * @param Revision $revision
1349          * @return bool
1350          */
1351         public function updateIfNewerOn( $dbw, $revision ) {
1352
1353                 $row = $dbw->selectRow(
1354                         [ 'revision', 'page' ],
1355                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1356                         [
1357                                 'page_id' => $this->getId(),
1358                                 'page_latest=rev_id' ],
1359                         __METHOD__ );
1360
1361                 if ( $row ) {
1362                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1363                                 return false;
1364                         }
1365                         $prev = $row->rev_id;
1366                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1367                 } else {
1368                         // No or missing previous revision; mark the page as new
1369                         $prev = 0;
1370                         $lastRevIsRedirect = null;
1371                 }
1372
1373                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1374
1375                 return $ret;
1376         }
1377
1378         /**
1379          * Get the content that needs to be saved in order to undo all revisions
1380          * between $undo and $undoafter. Revisions must belong to the same page,
1381          * must exist and must not be deleted
1382          * @param Revision $undo
1383          * @param Revision $undoafter Must be an earlier revision than $undo
1384          * @return Content|bool Content on success, false on failure
1385          * @since 1.21
1386          * Before we had the Content object, this was done in getUndoText
1387          */
1388         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1389                 $handler = $undo->getContentHandler();
1390                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1391         }
1392
1393         /**
1394          * Returns true if this page's content model supports sections.
1395          *
1396          * @return bool
1397          *
1398          * @todo The skin should check this and not offer section functionality if
1399          *   sections are not supported.
1400          * @todo The EditPage should check this and not offer section functionality
1401          *   if sections are not supported.
1402          */
1403         public function supportsSections() {
1404                 return $this->getContentHandler()->supportsSections();
1405         }
1406
1407         /**
1408          * @param string|number|null|bool $sectionId Section identifier as a number or string
1409          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1410          * or 'new' for a new section.
1411          * @param Content $sectionContent New content of the section.
1412          * @param string $sectionTitle New section's subject, only if $section is "new".
1413          * @param string $edittime Revision timestamp or null to use the current revision.
1414          *
1415          * @throws MWException
1416          * @return Content|null New complete article content, or null if error.
1417          *
1418          * @since 1.21
1419          * @deprecated since 1.24, use replaceSectionAtRev instead
1420          */
1421         public function replaceSectionContent(
1422                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1423         ) {
1424
1425                 $baseRevId = null;
1426                 if ( $edittime && $sectionId !== 'new' ) {
1427                         $dbr = wfGetDB( DB_REPLICA );
1428                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1429                         // Try the master if this thread may have just added it.
1430                         // This could be abstracted into a Revision method, but we don't want
1431                         // to encourage loading of revisions by timestamp.
1432                         if ( !$rev
1433                                 && wfGetLB()->getServerCount() > 1
1434                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1435                         ) {
1436                                 $dbw = wfGetDB( DB_MASTER );
1437                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1438                         }
1439                         if ( $rev ) {
1440                                 $baseRevId = $rev->getId();
1441                         }
1442                 }
1443
1444                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1445         }
1446
1447         /**
1448          * @param string|number|null|bool $sectionId Section identifier as a number or string
1449          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1450          * or 'new' for a new section.
1451          * @param Content $sectionContent New content of the section.
1452          * @param string $sectionTitle New section's subject, only if $section is "new".
1453          * @param int|null $baseRevId
1454          *
1455          * @throws MWException
1456          * @return Content|null New complete article content, or null if error.
1457          *
1458          * @since 1.24
1459          */
1460         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1461                 $sectionTitle = '', $baseRevId = null
1462         ) {
1463
1464                 if ( strval( $sectionId ) === '' ) {
1465                         // Whole-page edit; let the whole text through
1466                         $newContent = $sectionContent;
1467                 } else {
1468                         if ( !$this->supportsSections() ) {
1469                                 throw new MWException( "sections not supported for content model " .
1470                                         $this->getContentHandler()->getModelID() );
1471                         }
1472
1473                         // Bug 30711: always use current version when adding a new section
1474                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1475                                 $oldContent = $this->getContent();
1476                         } else {
1477                                 $rev = Revision::newFromId( $baseRevId );
1478                                 if ( !$rev ) {
1479                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1480                                                 $this->getId() . "; section: $sectionId)\n" );
1481                                         return null;
1482                                 }
1483
1484                                 $oldContent = $rev->getContent();
1485                         }
1486
1487                         if ( !$oldContent ) {
1488                                 wfDebug( __METHOD__ . ": no page text\n" );
1489                                 return null;
1490                         }
1491
1492                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1493                 }
1494
1495                 return $newContent;
1496         }
1497
1498         /**
1499          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1500          * @param int $flags
1501          * @return int Updated $flags
1502          */
1503         public function checkFlags( $flags ) {
1504                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1505                         if ( $this->exists() ) {
1506                                 $flags |= EDIT_UPDATE;
1507                         } else {
1508                                 $flags |= EDIT_NEW;
1509                         }
1510                 }
1511
1512                 return $flags;
1513         }
1514
1515         /**
1516          * Change an existing article or create a new article. Updates RC and all necessary caches,
1517          * optionally via the deferred update array.
1518          *
1519          * @param string $text New text
1520          * @param string $summary Edit summary
1521          * @param int $flags Bitfield:
1522          *      EDIT_NEW
1523          *          Article is known or assumed to be non-existent, create a new one
1524          *      EDIT_UPDATE
1525          *          Article is known or assumed to be pre-existing, update it
1526          *      EDIT_MINOR
1527          *          Mark this edit minor, if the user is allowed to do so
1528          *      EDIT_SUPPRESS_RC
1529          *          Do not log the change in recentchanges
1530          *      EDIT_FORCE_BOT
1531          *          Mark the edit a "bot" edit regardless of user rights
1532          *      EDIT_AUTOSUMMARY
1533          *          Fill in blank summaries with generated text where possible
1534          *      EDIT_INTERNAL
1535          *          Signal that the page retrieve/save cycle happened entirely in this request.
1536          *
1537          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1538          * article will be detected. If EDIT_UPDATE is specified and the article
1539          * doesn't exist, the function will return an edit-gone-missing error. If
1540          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1541          * error will be returned. These two conditions are also possible with
1542          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1543          *
1544          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1545          *   This is not the parent revision ID, rather the revision ID for older
1546          *   content used as the source for a rollback, for example.
1547          * @param User $user The user doing the edit
1548          *
1549          * @throws MWException
1550          * @return Status Possible errors:
1551          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1552          *     set the fatal flag of $status
1553          *   edit-gone-missing: In update mode, but the article didn't exist.
1554          *   edit-conflict: In update mode, the article changed unexpectedly.
1555          *   edit-no-change: Warning that the text was the same as before.
1556          *   edit-already-exists: In creation mode, but the article already exists.
1557          *
1558          * Extensions may define additional errors.
1559          *
1560          * $return->value will contain an associative array with members as follows:
1561          *     new: Boolean indicating if the function attempted to create a new article.
1562          *     revision: The revision object for the inserted revision, or null.
1563          *
1564          * Compatibility note: this function previously returned a boolean value
1565          * indicating success/failure
1566          *
1567          * @deprecated since 1.21: use doEditContent() instead.
1568          */
1569         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1570                 wfDeprecated( __METHOD__, '1.21' );
1571
1572                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1573
1574                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1575         }
1576
1577         /**
1578          * Change an existing article or create a new article. Updates RC and all necessary caches,
1579          * optionally via the deferred update array.
1580          *
1581          * @param Content $content New content
1582          * @param string $summary Edit summary
1583          * @param int $flags Bitfield:
1584          *      EDIT_NEW
1585          *          Article is known or assumed to be non-existent, create a new one
1586          *      EDIT_UPDATE
1587          *          Article is known or assumed to be pre-existing, update it
1588          *      EDIT_MINOR
1589          *          Mark this edit minor, if the user is allowed to do so
1590          *      EDIT_SUPPRESS_RC
1591          *          Do not log the change in recentchanges
1592          *      EDIT_FORCE_BOT
1593          *          Mark the edit a "bot" edit regardless of user rights
1594          *      EDIT_AUTOSUMMARY
1595          *          Fill in blank summaries with generated text where possible
1596          *      EDIT_INTERNAL
1597          *          Signal that the page retrieve/save cycle happened entirely in this request.
1598          *
1599          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1600          * article will be detected. If EDIT_UPDATE is specified and the article
1601          * doesn't exist, the function will return an edit-gone-missing error. If
1602          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1603          * error will be returned. These two conditions are also possible with
1604          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1605          *
1606          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1607          *   This is not the parent revision ID, rather the revision ID for older
1608          *   content used as the source for a rollback, for example.
1609          * @param User $user The user doing the edit
1610          * @param string $serialFormat Format for storing the content in the
1611          *   database.
1612          * @param array|null $tags Change tags to apply to this edit
1613          * Callers are responsible for permission checks
1614          * (with ChangeTags::canAddTagsAccompanyingChange)
1615          *
1616          * @throws MWException
1617          * @return Status Possible errors:
1618          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1619          *       set the fatal flag of $status.
1620          *     edit-gone-missing: In update mode, but the article didn't exist.
1621          *     edit-conflict: In update mode, the article changed unexpectedly.
1622          *     edit-no-change: Warning that the text was the same as before.
1623          *     edit-already-exists: In creation mode, but the article already exists.
1624          *
1625          *  Extensions may define additional errors.
1626          *
1627          *  $return->value will contain an associative array with members as follows:
1628          *     new: Boolean indicating if the function attempted to create a new article.
1629          *     revision: The revision object for the inserted revision, or null.
1630          *
1631          * @since 1.21
1632          * @throws MWException
1633          */
1634         public function doEditContent(
1635                 Content $content, $summary, $flags = 0, $baseRevId = false,
1636                 User $user = null, $serialFormat = null, $tags = []
1637         ) {
1638                 global $wgUser, $wgUseAutomaticEditSummaries;
1639
1640                 // Old default parameter for $tags was null
1641                 if ( $tags === null ) {
1642                         $tags = [];
1643                 }
1644
1645                 // Low-level sanity check
1646                 if ( $this->mTitle->getText() === '' ) {
1647                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1648                 }
1649                 // Make sure the given content type is allowed for this page
1650                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1651                         return Status::newFatal( 'content-not-allowed-here',
1652                                 ContentHandler::getLocalizedName( $content->getModel() ),
1653                                 $this->mTitle->getPrefixedText()
1654                         );
1655                 }
1656
1657                 // Load the data from the master database if needed.
1658                 // The caller may already loaded it from the master or even loaded it using
1659                 // SELECT FOR UPDATE, so do not override that using clear().
1660                 $this->loadPageData( 'fromdbmaster' );
1661
1662                 $user = $user ?: $wgUser;
1663                 $flags = $this->checkFlags( $flags );
1664
1665                 // Trigger pre-save hook (using provided edit summary)
1666                 $hookStatus = Status::newGood( [] );
1667                 $hook_args = [ &$this, &$user, &$content, &$summary,
1668                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1669                 // Check if the hook rejected the attempted save
1670                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1671                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args, '1.21' )
1672                 ) {
1673                         if ( $hookStatus->isOK() ) {
1674                                 // Hook returned false but didn't call fatal(); use generic message
1675                                 $hookStatus->fatal( 'edit-hook-aborted' );
1676                         }
1677
1678                         return $hookStatus;
1679                 }
1680
1681                 $old_revision = $this->getRevision(); // current revision
1682                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1683
1684                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1685                         $tags[] = 'mw-contentmodelchange';
1686                 }
1687
1688                 // Provide autosummaries if one is not provided and autosummaries are enabled
1689                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1690                         $handler = $content->getContentHandler();
1691                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1692                 }
1693
1694                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1695                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1696                         $useCache = false;
1697                 } else {
1698                         $useCache = true;
1699                 }
1700
1701                 // Get the pre-save transform content and final parser output
1702                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1703                 $pstContent = $editInfo->pstContent; // Content object
1704                 $meta = [
1705                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1706                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1707                         'serialized' => $editInfo->pst,
1708                         'serialFormat' => $serialFormat,
1709                         'baseRevId' => $baseRevId,
1710                         'oldRevision' => $old_revision,
1711                         'oldContent' => $old_content,
1712                         'oldId' => $this->getLatest(),
1713                         'oldIsRedirect' => $this->isRedirect(),
1714                         'oldCountable' => $this->isCountable(),
1715                         'tags' => ( $tags !== null ) ? (array)$tags : []
1716                 ];
1717
1718                 // Actually create the revision and create/update the page
1719                 if ( $flags & EDIT_UPDATE ) {
1720                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1721                 } else {
1722                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1723                 }
1724
1725                 // Promote user to any groups they meet the criteria for
1726                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1727                         $user->addAutopromoteOnceGroups( 'onEdit' );
1728                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1729                 } );
1730
1731                 return $status;
1732         }
1733
1734         /**
1735          * @param Content $content Pre-save transform content
1736          * @param integer $flags
1737          * @param User $user
1738          * @param string $summary
1739          * @param array $meta
1740          * @return Status
1741          * @throws DBUnexpectedError
1742          * @throws Exception
1743          * @throws FatalError
1744          * @throws MWException
1745          */
1746         private function doModify(
1747                 Content $content, $flags, User $user, $summary, array $meta
1748         ) {
1749                 global $wgUseRCPatrol;
1750
1751                 // Update article, but only if changed.
1752                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1753
1754                 // Convenience variables
1755                 $now = wfTimestampNow();
1756                 $oldid = $meta['oldId'];
1757                 /** @var $oldContent Content|null */
1758                 $oldContent = $meta['oldContent'];
1759                 $newsize = $content->getSize();
1760
1761                 if ( !$oldid ) {
1762                         // Article gone missing
1763                         $status->fatal( 'edit-gone-missing' );
1764
1765                         return $status;
1766                 } elseif ( !$oldContent ) {
1767                         // Sanity check for bug 37225
1768                         throw new MWException( "Could not find text for current revision {$oldid}." );
1769                 }
1770
1771                 // @TODO: pass content object?!
1772                 $revision = new Revision( [
1773                         'page'       => $this->getId(),
1774                         'title'      => $this->mTitle, // for determining the default content model
1775                         'comment'    => $summary,
1776                         'minor_edit' => $meta['minor'],
1777                         'text'       => $meta['serialized'],
1778                         'len'        => $newsize,
1779                         'parent_id'  => $oldid,
1780                         'user'       => $user->getId(),
1781                         'user_text'  => $user->getName(),
1782                         'timestamp'  => $now,
1783                         'content_model' => $content->getModel(),
1784                         'content_format' => $meta['serialFormat'],
1785                 ] );
1786
1787                 $changed = !$content->equals( $oldContent );
1788
1789                 $dbw = wfGetDB( DB_MASTER );
1790
1791                 if ( $changed ) {
1792                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1793                         $status->merge( $prepStatus );
1794                         if ( !$status->isOK() ) {
1795                                 return $status;
1796                         }
1797
1798                         $dbw->startAtomic( __METHOD__ );
1799                         // Get the latest page_latest value while locking it.
1800                         // Do a CAS style check to see if it's the same as when this method
1801                         // started. If it changed then bail out before touching the DB.
1802                         $latestNow = $this->lockAndGetLatest();
1803                         if ( $latestNow != $oldid ) {
1804                                 $dbw->endAtomic( __METHOD__ );
1805                                 // Page updated or deleted in the mean time
1806                                 $status->fatal( 'edit-conflict' );
1807
1808                                 return $status;
1809                         }
1810
1811                         // At this point we are now comitted to returning an OK
1812                         // status unless some DB query error or other exception comes up.
1813                         // This way callers don't have to call rollback() if $status is bad
1814                         // unless they actually try to catch exceptions (which is rare).
1815
1816                         // Save the revision text
1817                         $revisionId = $revision->insertOn( $dbw );
1818                         // Update page_latest and friends to reflect the new revision
1819                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1820                                 throw new MWException( "Failed to update page row to use new revision." );
1821                         }
1822
1823                         Hooks::run( 'NewRevisionFromEditComplete',
1824                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1825
1826                         // Update recentchanges
1827                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1828                                 // Mark as patrolled if the user can do so
1829                                 $patrolled = $wgUseRCPatrol && !count(
1830                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1831                                 // Add RC row to the DB
1832                                 RecentChange::notifyEdit(
1833                                         $now,
1834                                         $this->mTitle,
1835                                         $revision->isMinor(),
1836                                         $user,
1837                                         $summary,
1838                                         $oldid,
1839                                         $this->getTimestamp(),
1840                                         $meta['bot'],
1841                                         '',
1842                                         $oldContent ? $oldContent->getSize() : 0,
1843                                         $newsize,
1844                                         $revisionId,
1845                                         $patrolled,
1846                                         $meta['tags']
1847                                 );
1848                         }
1849
1850                         $user->incEditCount();
1851
1852                         $dbw->endAtomic( __METHOD__ );
1853                         $this->mTimestamp = $now;
1854                 } else {
1855                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1856                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1857                         $revision->setId( $this->getLatest() );
1858                         $revision->setUserIdAndName(
1859                                 $this->getUser( Revision::RAW ),
1860                                 $this->getUserText( Revision::RAW )
1861                         );
1862                 }
1863
1864                 if ( $changed ) {
1865                         // Return the new revision to the caller
1866                         $status->value['revision'] = $revision;
1867                 } else {
1868                         $status->warning( 'edit-no-change' );
1869                         // Update page_touched as updateRevisionOn() was not called.
1870                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1871                         $this->mTitle->invalidateCache( $now );
1872                 }
1873
1874                 // Do secondary updates once the main changes have been committed...
1875                 DeferredUpdates::addUpdate(
1876                         new AtomicSectionUpdate(
1877                                 $dbw,
1878                                 __METHOD__,
1879                                 function () use (
1880                                         $revision, &$user, $content, $summary, &$flags,
1881                                         $changed, $meta, &$status
1882                                 ) {
1883                                         // Update links tables, site stats, etc.
1884                                         $this->doEditUpdates(
1885                                                 $revision,
1886                                                 $user,
1887                                                 [
1888                                                         'changed' => $changed,
1889                                                         'oldcountable' => $meta['oldCountable'],
1890                                                         'oldrevision' => $meta['oldRevision']
1891                                                 ]
1892                                         );
1893                                         // Trigger post-save hook
1894                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1895                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1896                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1897                                         Hooks::run( 'PageContentSaveComplete', $params );
1898                                 }
1899                         ),
1900                         DeferredUpdates::PRESEND
1901                 );
1902
1903                 return $status;
1904         }
1905
1906         /**
1907          * @param Content $content Pre-save transform content
1908          * @param integer $flags
1909          * @param User $user
1910          * @param string $summary
1911          * @param array $meta
1912          * @return Status
1913          * @throws DBUnexpectedError
1914          * @throws Exception
1915          * @throws FatalError
1916          * @throws MWException
1917          */
1918         private function doCreate(
1919                 Content $content, $flags, User $user, $summary, array $meta
1920         ) {
1921                 global $wgUseRCPatrol, $wgUseNPPatrol;
1922
1923                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1924
1925                 $now = wfTimestampNow();
1926                 $newsize = $content->getSize();
1927                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1928                 $status->merge( $prepStatus );
1929                 if ( !$status->isOK() ) {
1930                         return $status;
1931                 }
1932
1933                 $dbw = wfGetDB( DB_MASTER );
1934                 $dbw->startAtomic( __METHOD__ );
1935
1936                 // Add the page record unless one already exists for the title
1937                 $newid = $this->insertOn( $dbw );
1938                 if ( $newid === false ) {
1939                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1940                         $status->fatal( 'edit-already-exists' );
1941
1942                         return $status; // nothing done
1943                 }
1944
1945                 // At this point we are now comitted to returning an OK
1946                 // status unless some DB query error or other exception comes up.
1947                 // This way callers don't have to call rollback() if $status is bad
1948                 // unless they actually try to catch exceptions (which is rare).
1949
1950                 // @TODO: pass content object?!
1951                 $revision = new Revision( [
1952                         'page'       => $newid,
1953                         'title'      => $this->mTitle, // for determining the default content model
1954                         'comment'    => $summary,
1955                         'minor_edit' => $meta['minor'],
1956                         'text'       => $meta['serialized'],
1957                         'len'        => $newsize,
1958                         'user'       => $user->getId(),
1959                         'user_text'  => $user->getName(),
1960                         'timestamp'  => $now,
1961                         'content_model' => $content->getModel(),
1962                         'content_format' => $meta['serialFormat'],
1963                 ] );
1964
1965                 // Save the revision text...
1966                 $revisionId = $revision->insertOn( $dbw );
1967                 // Update the page record with revision data
1968                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1969                         throw new MWException( "Failed to update page row to use new revision." );
1970                 }
1971
1972                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1973
1974                 // Update recentchanges
1975                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1976                         // Mark as patrolled if the user can do so
1977                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1978                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1979                         // Add RC row to the DB
1980                         RecentChange::notifyNew(
1981                                 $now,
1982                                 $this->mTitle,
1983                                 $revision->isMinor(),
1984                                 $user,
1985                                 $summary,
1986                                 $meta['bot'],
1987                                 '',
1988                                 $newsize,
1989                                 $revisionId,
1990                                 $patrolled,
1991                                 $meta['tags']
1992                         );
1993                 }
1994
1995                 $user->incEditCount();
1996
1997                 $dbw->endAtomic( __METHOD__ );
1998                 $this->mTimestamp = $now;
1999
2000                 // Return the new revision to the caller
2001                 $status->value['revision'] = $revision;
2002
2003                 // Do secondary updates once the main changes have been committed...
2004                 DeferredUpdates::addUpdate(
2005                         new AtomicSectionUpdate(
2006                                 $dbw,
2007                                 __METHOD__,
2008                                 function () use (
2009                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
2010                                 ) {
2011                                         // Update links, etc.
2012                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
2013                                         // Trigger post-create hook
2014                                         $params = [ &$this, &$user, $content, $summary,
2015                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2016                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params, '1.21' );
2017                                         Hooks::run( 'PageContentInsertComplete', $params );
2018                                         // Trigger post-save hook
2019                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2020                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params, '1.21' );
2021                                         Hooks::run( 'PageContentSaveComplete', $params );
2022
2023                                 }
2024                         ),
2025                         DeferredUpdates::PRESEND
2026                 );
2027
2028                 return $status;
2029         }
2030
2031         /**
2032          * Get parser options suitable for rendering the primary article wikitext
2033          *
2034          * @see ContentHandler::makeParserOptions
2035          *
2036          * @param IContextSource|User|string $context One of the following:
2037          *        - IContextSource: Use the User and the Language of the provided
2038          *          context
2039          *        - User: Use the provided User object and $wgLang for the language,
2040          *          so use an IContextSource object if possible.
2041          *        - 'canonical': Canonical options (anonymous user with default
2042          *          preferences and content language).
2043          * @return ParserOptions
2044          */
2045         public function makeParserOptions( $context ) {
2046                 $options = $this->getContentHandler()->makeParserOptions( $context );
2047
2048                 if ( $this->getTitle()->isConversionTable() ) {
2049                         // @todo ConversionTable should become a separate content model, so
2050                         // we don't need special cases like this one.
2051                         $options->disableContentConversion();
2052                 }
2053
2054                 return $options;
2055         }
2056
2057         /**
2058          * Prepare content which is about to be saved.
2059          * Returns a stdClass with source, pst and output members
2060          *
2061          * @param Content $content
2062          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2063          *        revision ID is also accepted, but this is deprecated.
2064          * @param User|null $user
2065          * @param string|null $serialFormat
2066          * @param bool $useCache Check shared prepared edit cache
2067          *
2068          * @return object
2069          *
2070          * @since 1.21
2071          */
2072         public function prepareContentForEdit(
2073                 Content $content, $revision = null, User $user = null,
2074                 $serialFormat = null, $useCache = true
2075         ) {
2076                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2077
2078                 if ( is_object( $revision ) ) {
2079                         $revid = $revision->getId();
2080                 } else {
2081                         $revid = $revision;
2082                         // This code path is deprecated, and nothing is known to
2083                         // use it, so performance here shouldn't be a worry.
2084                         if ( $revid !== null ) {
2085                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2086                         } else {
2087                                 $revision = null;
2088                         }
2089                 }
2090
2091                 $user = is_null( $user ) ? $wgUser : $user;
2092                 // XXX: check $user->getId() here???
2093
2094                 // Use a sane default for $serialFormat, see bug 57026
2095                 if ( $serialFormat === null ) {
2096                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2097                 }
2098
2099                 if ( $this->mPreparedEdit
2100                         && isset( $this->mPreparedEdit->newContent )
2101                         && $this->mPreparedEdit->newContent->equals( $content )
2102                         && $this->mPreparedEdit->revid == $revid
2103                         && $this->mPreparedEdit->format == $serialFormat
2104                         // XXX: also check $user here?
2105                 ) {
2106                         // Already prepared
2107                         return $this->mPreparedEdit;
2108                 }
2109
2110                 // The edit may have already been prepared via api.php?action=stashedit
2111                 $cachedEdit = $useCache && $wgAjaxEditStash
2112                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2113                         : false;
2114
2115                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2116                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2117
2118                 $edit = (object)[];
2119                 if ( $cachedEdit ) {
2120                         $edit->timestamp = $cachedEdit->timestamp;
2121                 } else {
2122                         $edit->timestamp = wfTimestampNow();
2123                 }
2124                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2125                 $edit->revid = $revid;
2126
2127                 if ( $cachedEdit ) {
2128                         $edit->pstContent = $cachedEdit->pstContent;
2129                 } else {
2130                         $edit->pstContent = $content
2131                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2132                                 : null;
2133                 }
2134
2135                 $edit->format = $serialFormat;
2136                 $edit->popts = $this->makeParserOptions( 'canonical' );
2137                 if ( $cachedEdit ) {
2138                         $edit->output = $cachedEdit->output;
2139                 } else {
2140                         if ( $revision ) {
2141                                 // We get here if vary-revision is set. This means that this page references
2142                                 // itself (such as via self-transclusion). In this case, we need to make sure
2143                                 // that any such self-references refer to the newly-saved revision, and not
2144                                 // to the previous one, which could otherwise happen due to replica DB lag.
2145                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2146                                 $edit->popts->setCurrentRevisionCallback(
2147                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2148                                                 if ( $title->equals( $revision->getTitle() ) ) {
2149                                                         return $revision;
2150                                                 } else {
2151                                                         return call_user_func( $oldCallback, $title, $parser );
2152                                                 }
2153                                         }
2154                                 );
2155                         } else {
2156                                 // Try to avoid a second parse if {{REVISIONID}} is used
2157                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2158                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2159                                                 'revision',
2160                                                 'MAX(rev_id)',
2161                                                 [],
2162                                                 __METHOD__
2163                                         );
2164                                 } );
2165                         }
2166                         $edit->output = $edit->pstContent
2167                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2168                                 : null;
2169                 }
2170
2171                 $edit->newContent = $content;
2172                 $edit->oldContent = $this->getContent( Revision::RAW );
2173
2174                 // NOTE: B/C for hooks! don't use these fields!
2175                 $edit->newText = $edit->newContent
2176                         ? ContentHandler::getContentText( $edit->newContent )
2177                         : '';
2178                 $edit->oldText = $edit->oldContent
2179                         ? ContentHandler::getContentText( $edit->oldContent )
2180                         : '';
2181                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2182
2183                 if ( $edit->output ) {
2184                         $edit->output->setCacheTime( wfTimestampNow() );
2185                 }
2186
2187                 // Process cache the result
2188                 $this->mPreparedEdit = $edit;
2189
2190                 return $edit;
2191         }
2192
2193         /**
2194          * Do standard deferred updates after page edit.
2195          * Update links tables, site stats, search index and message cache.
2196          * Purges pages that include this page if the text was changed here.
2197          * Every 100th edit, prune the recent changes table.
2198          *
2199          * @param Revision $revision
2200          * @param User $user User object that did the revision
2201          * @param array $options Array of options, following indexes are used:
2202          * - changed: boolean, whether the revision changed the content (default true)
2203          * - created: boolean, whether the revision created the page (default false)
2204          * - moved: boolean, whether the page was moved (default false)
2205          * - restored: boolean, whether the page was undeleted (default false)
2206          * - oldrevision: Revision object for the pre-update revision (default null)
2207          * - oldcountable: boolean, null, or string 'no-change' (default null):
2208          *   - boolean: whether the page was counted as an article before that
2209          *     revision, only used in changed is true and created is false
2210          *   - null: if created is false, don't update the article count; if created
2211          *     is true, do update the article count
2212          *   - 'no-change': don't update the article count, ever
2213          */
2214         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2215                 global $wgRCWatchCategoryMembership, $wgContLang;
2216
2217                 $options += [
2218                         'changed' => true,
2219                         'created' => false,
2220                         'moved' => false,
2221                         'restored' => false,
2222                         'oldrevision' => null,
2223                         'oldcountable' => null
2224                 ];
2225                 $content = $revision->getContent();
2226
2227                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2228
2229                 // See if the parser output before $revision was inserted is still valid
2230                 $editInfo = false;
2231                 if ( !$this->mPreparedEdit ) {
2232                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2233                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2234                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2235                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2236                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2237                 ) {
2238                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2239                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2240                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2241                 } else {
2242                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2243                         $editInfo = $this->mPreparedEdit;
2244                 }
2245
2246                 if ( !$editInfo ) {
2247                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2248                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2249                         // as any prepared content from there or in doEditContent() was already rejected.
2250                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2251                 }
2252
2253                 // Save it to the parser cache.
2254                 // Make sure the cache time matches page_touched to avoid double parsing.
2255                 ParserCache::singleton()->save(
2256                         $editInfo->output, $this, $editInfo->popts,
2257                         $revision->getTimestamp(), $editInfo->revid
2258                 );
2259
2260                 // Update the links tables and other secondary data
2261                 if ( $content ) {
2262                         $recursive = $options['changed']; // bug 50785
2263                         $updates = $content->getSecondaryDataUpdates(
2264                                 $this->getTitle(), null, $recursive, $editInfo->output
2265                         );
2266                         foreach ( $updates as $update ) {
2267                                 if ( $update instanceof LinksUpdate ) {
2268                                         $update->setRevision( $revision );
2269                                         $update->setTriggeringUser( $user );
2270                                 }
2271                                 DeferredUpdates::addUpdate( $update );
2272                         }
2273                         if ( $wgRCWatchCategoryMembership
2274                                 && $this->getContentHandler()->supportsCategories() === true
2275                                 && ( $options['changed'] || $options['created'] )
2276                                 && !$options['restored']
2277                         ) {
2278                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2279                                 // the recent change entry (also done via deferred updates) and carry over any
2280                                 // bot/deletion/IP flags, ect.
2281                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2282                                         $this->getTitle(),
2283                                         [
2284                                                 'pageId' => $this->getId(),
2285                                                 'revTimestamp' => $revision->getTimestamp()
2286                                         ]
2287                                 ) );
2288                         }
2289                 }
2290
2291                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2292
2293                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2294                         // Flush old entries from the `recentchanges` table
2295                         if ( mt_rand( 0, 9 ) == 0 ) {
2296                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2297                         }
2298                 }
2299
2300                 if ( !$this->exists() ) {
2301                         return;
2302                 }
2303
2304                 $id = $this->getId();
2305                 $title = $this->mTitle->getPrefixedDBkey();
2306                 $shortTitle = $this->mTitle->getDBkey();
2307
2308                 if ( $options['oldcountable'] === 'no-change' ||
2309                         ( !$options['changed'] && !$options['moved'] )
2310                 ) {
2311                         $good = 0;
2312                 } elseif ( $options['created'] ) {
2313                         $good = (int)$this->isCountable( $editInfo );
2314                 } elseif ( $options['oldcountable'] !== null ) {
2315                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2316                 } else {
2317                         $good = 0;
2318                 }
2319                 $edits = $options['changed'] ? 1 : 0;
2320                 $total = $options['created'] ? 1 : 0;
2321
2322                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2323                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2324
2325                 // If this is another user's talk page, update newtalk.
2326                 // Don't do this if $options['changed'] = false (null-edits) nor if
2327                 // it's a minor edit and the user doesn't want notifications for those.
2328                 if ( $options['changed']
2329                         && $this->mTitle->getNamespace() == NS_USER_TALK
2330                         && $shortTitle != $user->getTitleKey()
2331                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2332                 ) {
2333                         $recipient = User::newFromName( $shortTitle, false );
2334                         if ( !$recipient ) {
2335                                 wfDebug( __METHOD__ . ": invalid username\n" );
2336                         } else {
2337                                 // Allow extensions to prevent user notification
2338                                 // when a new message is added to their talk page
2339                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2340                                         if ( User::isIP( $shortTitle ) ) {
2341                                                 // An anonymous user
2342                                                 $recipient->setNewtalk( true, $revision );
2343                                         } elseif ( $recipient->isLoggedIn() ) {
2344                                                 $recipient->setNewtalk( true, $revision );
2345                                         } else {
2346                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2347                                         }
2348                                 }
2349                         }
2350                 }
2351
2352                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2353                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2354                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2355                         if ( $msgtext === false || $msgtext === null ) {
2356                                 $msgtext = '';
2357                         }
2358
2359                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2360
2361                         if ( $wgContLang->hasVariants() ) {
2362                                 $wgContLang->updateConversionTable( $this->mTitle );
2363                         }
2364                 }
2365
2366                 if ( $options['created'] ) {
2367                         self::onArticleCreate( $this->mTitle );
2368                 } elseif ( $options['changed'] ) { // bug 50785
2369                         self::onArticleEdit( $this->mTitle, $revision );
2370                 }
2371
2372                 ResourceLoaderWikiModule::invalidateModuleCache(
2373                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2374                 );
2375         }
2376
2377         /**
2378          * Update the article's restriction field, and leave a log entry.
2379          * This works for protection both existing and non-existing pages.
2380          *
2381          * @param array $limit Set of restriction keys
2382          * @param array $expiry Per restriction type expiration
2383          * @param int &$cascade Set to false if cascading protection isn't allowed.
2384          * @param string $reason
2385          * @param User $user The user updating the restrictions
2386          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2387          *   ($user should be able to add the specified tags before this is called)
2388          * @return Status Status object; if action is taken, $status->value is the log_id of the
2389          *   protection log entry.
2390          */
2391         public function doUpdateRestrictions( array $limit, array $expiry,
2392                 &$cascade, $reason, User $user, $tags = null
2393         ) {
2394                 global $wgCascadingRestrictionLevels, $wgContLang;
2395
2396                 if ( wfReadOnly() ) {
2397                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2398                 }
2399
2400                 $this->loadPageData( 'fromdbmaster' );
2401                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2402                 $id = $this->getId();
2403
2404                 if ( !$cascade ) {
2405                         $cascade = false;
2406                 }
2407
2408                 // Take this opportunity to purge out expired restrictions
2409                 Title::purgeExpiredRestrictions();
2410
2411                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2412                 // we expect a single selection, but the schema allows otherwise.
2413                 $isProtected = false;
2414                 $protect = false;
2415                 $changed = false;
2416
2417                 $dbw = wfGetDB( DB_MASTER );
2418
2419                 foreach ( $restrictionTypes as $action ) {
2420                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2421                                 $expiry[$action] = 'infinity';
2422                         }
2423                         if ( !isset( $limit[$action] ) ) {
2424                                 $limit[$action] = '';
2425                         } elseif ( $limit[$action] != '' ) {
2426                                 $protect = true;
2427                         }
2428
2429                         // Get current restrictions on $action
2430                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2431                         if ( $current != '' ) {
2432                                 $isProtected = true;
2433                         }
2434
2435                         if ( $limit[$action] != $current ) {
2436                                 $changed = true;
2437                         } elseif ( $limit[$action] != '' ) {
2438                                 // Only check expiry change if the action is actually being
2439                                 // protected, since expiry does nothing on an not-protected
2440                                 // action.
2441                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2442                                         $changed = true;
2443                                 }
2444                         }
2445                 }
2446
2447                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2448                         $changed = true;
2449                 }
2450
2451                 // If nothing has changed, do nothing
2452                 if ( !$changed ) {
2453                         return Status::newGood();
2454                 }
2455
2456                 if ( !$protect ) { // No protection at all means unprotection
2457                         $revCommentMsg = 'unprotectedarticle-comment';
2458                         $logAction = 'unprotect';
2459                 } elseif ( $isProtected ) {
2460                         $revCommentMsg = 'modifiedarticleprotection-comment';
2461                         $logAction = 'modify';
2462                 } else {
2463                         $revCommentMsg = 'protectedarticle-comment';
2464                         $logAction = 'protect';
2465                 }
2466
2467                 // Truncate for whole multibyte characters
2468                 $reason = $wgContLang->truncate( $reason, 255 );
2469
2470                 $logRelationsValues = [];
2471                 $logRelationsField = null;
2472                 $logParamsDetails = [];
2473
2474                 // Null revision (used for change tag insertion)
2475                 $nullRevision = null;
2476
2477                 if ( $id ) { // Protection of existing page
2478                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2479                                 return Status::newGood();
2480                         }
2481
2482                         // Only certain restrictions can cascade...
2483                         $editrestriction = isset( $limit['edit'] )
2484                                 ? [ $limit['edit'] ]
2485                                 : $this->mTitle->getRestrictions( 'edit' );
2486                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2487                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2488                         }
2489                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2490                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2491                         }
2492
2493                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2494                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2495                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2496                         }
2497                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2498                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2499                         }
2500
2501                         // The schema allows multiple restrictions
2502                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2503                                 $cascade = false;
2504                         }
2505
2506                         // insert null revision to identify the page protection change as edit summary
2507                         $latest = $this->getLatest();
2508                         $nullRevision = $this->insertProtectNullRevision(
2509                                 $revCommentMsg,
2510                                 $limit,
2511                                 $expiry,
2512                                 $cascade,
2513                                 $reason,
2514                                 $user
2515                         );
2516
2517                         if ( $nullRevision === null ) {
2518                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2519                         }
2520
2521                         $logRelationsField = 'pr_id';
2522
2523                         // Update restrictions table
2524                         foreach ( $limit as $action => $restrictions ) {
2525                                 $dbw->delete(
2526                                         'page_restrictions',
2527                                         [
2528                                                 'pr_page' => $id,
2529                                                 'pr_type' => $action
2530                                         ],
2531                                         __METHOD__
2532                                 );
2533                                 if ( $restrictions != '' ) {
2534                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2535                                         $dbw->insert(
2536                                                 'page_restrictions',
2537                                                 [
2538                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2539                                                         'pr_page' => $id,
2540                                                         'pr_type' => $action,
2541                                                         'pr_level' => $restrictions,
2542                                                         'pr_cascade' => $cascadeValue,
2543                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2544                                                 ],
2545                                                 __METHOD__
2546                                         );
2547                                         $logRelationsValues[] = $dbw->insertId();
2548                                         $logParamsDetails[] = [
2549                                                 'type' => $action,
2550                                                 'level' => $restrictions,
2551                                                 'expiry' => $expiry[$action],
2552                                                 'cascade' => (bool)$cascadeValue,
2553                                         ];
2554                                 }
2555                         }
2556
2557                         // Clear out legacy restriction fields
2558                         $dbw->update(
2559                                 'page',
2560                                 [ 'page_restrictions' => '' ],
2561                                 [ 'page_id' => $id ],
2562                                 __METHOD__
2563                         );
2564
2565                         Hooks::run( 'NewRevisionFromEditComplete',
2566                                 [ $this, $nullRevision, $latest, $user ] );
2567                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2568                 } else { // Protection of non-existing page (also known as "title protection")
2569                         // Cascade protection is meaningless in this case
2570                         $cascade = false;
2571
2572                         if ( $limit['create'] != '' ) {
2573                                 $dbw->replace( 'protected_titles',
2574                                         [ [ 'pt_namespace', 'pt_title' ] ],
2575                                         [
2576                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2577                                                 'pt_title' => $this->mTitle->getDBkey(),
2578                                                 'pt_create_perm' => $limit['create'],
2579                                                 'pt_timestamp' => $dbw->timestamp(),
2580                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2581                                                 'pt_user' => $user->getId(),
2582                                                 'pt_reason' => $reason,
2583                                         ], __METHOD__
2584                                 );
2585                                 $logParamsDetails[] = [
2586                                         'type' => 'create',
2587                                         'level' => $limit['create'],
2588                                         'expiry' => $expiry['create'],
2589                                 ];
2590                         } else {
2591                                 $dbw->delete( 'protected_titles',
2592                                         [
2593                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2594                                                 'pt_title' => $this->mTitle->getDBkey()
2595                                         ], __METHOD__
2596                                 );
2597                         }
2598                 }
2599
2600                 $this->mTitle->flushRestrictions();
2601                 InfoAction::invalidateCache( $this->mTitle );
2602
2603                 if ( $logAction == 'unprotect' ) {
2604                         $params = [];
2605                 } else {
2606                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2607                         $params = [
2608                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2609                                 '5:bool:cascade' => $cascade,
2610                                 'details' => $logParamsDetails, // parameter for localize and api
2611                         ];
2612                 }
2613
2614                 // Update the protection log
2615                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2616                 $logEntry->setTarget( $this->mTitle );
2617                 $logEntry->setComment( $reason );
2618                 $logEntry->setPerformer( $user );
2619                 $logEntry->setParameters( $params );
2620                 if ( !is_null( $nullRevision ) ) {
2621                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2622                 }
2623                 $logEntry->setTags( $tags );
2624                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2625                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2626                 }
2627                 $logId = $logEntry->insert();
2628                 $logEntry->publish( $logId );
2629
2630                 return Status::newGood( $logId );
2631         }
2632
2633         /**
2634          * Insert a new null revision for this page.
2635          *
2636          * @param string $revCommentMsg Comment message key for the revision
2637          * @param array $limit Set of restriction keys
2638          * @param array $expiry Per restriction type expiration
2639          * @param int $cascade Set to false if cascading protection isn't allowed.
2640          * @param string $reason
2641          * @param User|null $user
2642          * @return Revision|null Null on error
2643          */
2644         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2645                 array $expiry, $cascade, $reason, $user = null
2646         ) {
2647                 $dbw = wfGetDB( DB_MASTER );
2648
2649                 // Prepare a null revision to be added to the history
2650                 $editComment = wfMessage(
2651                         $revCommentMsg,
2652                         $this->mTitle->getPrefixedText(),
2653                         $user ? $user->getName() : ''
2654                 )->inContentLanguage()->text();
2655                 if ( $reason ) {
2656                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2657                 }
2658                 $protectDescription = $this->protectDescription( $limit, $expiry );
2659                 if ( $protectDescription ) {
2660                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2661                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2662                                 ->inContentLanguage()->text();
2663                 }
2664                 if ( $cascade ) {
2665                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2666                         $editComment .= wfMessage( 'brackets' )->params(
2667                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2668                         )->inContentLanguage()->text();
2669                 }
2670
2671                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2672                 if ( $nullRev ) {
2673                         $nullRev->insertOn( $dbw );
2674
2675                         // Update page record and touch page
2676                         $oldLatest = $nullRev->getParentId();
2677                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2678                 }
2679
2680                 return $nullRev;
2681         }
2682
2683         /**
2684          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2685          * @return string
2686          */
2687         protected function formatExpiry( $expiry ) {
2688                 global $wgContLang;
2689
2690                 if ( $expiry != 'infinity' ) {
2691                         return wfMessage(
2692                                 'protect-expiring',
2693                                 $wgContLang->timeanddate( $expiry, false, false ),
2694                                 $wgContLang->date( $expiry, false, false ),
2695                                 $wgContLang->time( $expiry, false, false )
2696                         )->inContentLanguage()->text();
2697                 } else {
2698                         return wfMessage( 'protect-expiry-indefinite' )
2699                                 ->inContentLanguage()->text();
2700                 }
2701         }
2702
2703         /**
2704          * Builds the description to serve as comment for the edit.
2705          *
2706          * @param array $limit Set of restriction keys
2707          * @param array $expiry Per restriction type expiration
2708          * @return string
2709          */
2710         public function protectDescription( array $limit, array $expiry ) {
2711                 $protectDescription = '';
2712
2713                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2714                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2715                         # All possible message keys are listed here for easier grepping:
2716                         # * restriction-create
2717                         # * restriction-edit
2718                         # * restriction-move
2719                         # * restriction-upload
2720                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2721                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2722                         # with '' filtered out. All possible message keys are listed below:
2723                         # * protect-level-autoconfirmed
2724                         # * protect-level-sysop
2725                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2726                                 ->inContentLanguage()->text();
2727
2728                         $expiryText = $this->formatExpiry( $expiry[$action] );
2729
2730                         if ( $protectDescription !== '' ) {
2731                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2732                         }
2733                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2734                                 ->params( $actionText, $restrictionsText, $expiryText )
2735                                 ->inContentLanguage()->text();
2736                 }
2737
2738                 return $protectDescription;
2739         }
2740
2741         /**
2742          * Builds the description to serve as comment for the log entry.
2743          *
2744          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2745          * protect description text. Keep them in old format to avoid breaking compatibility.
2746          * TODO: Fix protection log to store structured description and format it on-the-fly.
2747          *
2748          * @param array $limit Set of restriction keys
2749          * @param array $expiry Per restriction type expiration
2750          * @return string
2751          */
2752         public function protectDescriptionLog( array $limit, array $expiry ) {
2753                 global $wgContLang;
2754
2755                 $protectDescriptionLog = '';
2756
2757                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2758                         $expiryText = $this->formatExpiry( $expiry[$action] );
2759                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2760                                 "[$action=$restrictions] ($expiryText)";
2761                 }
2762
2763                 return trim( $protectDescriptionLog );
2764         }
2765
2766         /**
2767          * Take an array of page restrictions and flatten it to a string
2768          * suitable for insertion into the page_restrictions field.
2769          *
2770          * @param string[] $limit
2771          *
2772          * @throws MWException
2773          * @return string
2774          */
2775         protected static function flattenRestrictions( $limit ) {
2776                 if ( !is_array( $limit ) ) {
2777                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2778                 }
2779
2780                 $bits = [];
2781                 ksort( $limit );
2782
2783                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2784                         $bits[] = "$action=$restrictions";
2785                 }
2786
2787                 return implode( ':', $bits );
2788         }
2789
2790         /**
2791          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2792          * backwards compatibility, if you care about error reporting you should use
2793          * doDeleteArticleReal() instead.
2794          *
2795          * Deletes the article with database consistency, writes logs, purges caches
2796          *
2797          * @param string $reason Delete reason for deletion log
2798          * @param bool $suppress Suppress all revisions and log the deletion in
2799          *        the suppression log instead of the deletion log
2800          * @param int $u1 Unused
2801          * @param bool $u2 Unused
2802          * @param array|string &$error Array of errors to append to
2803          * @param User $user The deleting user
2804          * @return bool True if successful
2805          */
2806         public function doDeleteArticle(
2807                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2808         ) {
2809                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2810                 return $status->isGood();
2811         }
2812
2813         /**
2814          * Back-end article deletion
2815          * Deletes the article with database consistency, writes logs, purges caches
2816          *
2817          * @since 1.19
2818          *
2819          * @param string $reason Delete reason for deletion log
2820          * @param bool $suppress Suppress all revisions and log the deletion in
2821          *   the suppression log instead of the deletion log
2822          * @param int $u1 Unused
2823          * @param bool $u2 Unused
2824          * @param array|string &$error Array of errors to append to
2825          * @param User $user The deleting user
2826          * @param array $tags Tags to apply to the deletion action
2827          * @return Status Status object; if successful, $status->value is the log_id of the
2828          *   deletion log entry. If the page couldn't be deleted because it wasn't
2829          *   found, $status is a non-fatal 'cannotdelete' error
2830          */
2831         public function doDeleteArticleReal(
2832                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2833                 $tags = [], $logsubtype = 'delete'
2834         ) {
2835                 global $wgUser, $wgContentHandlerUseDB;
2836
2837                 wfDebug( __METHOD__ . "\n" );
2838
2839                 $status = Status::newGood();
2840
2841                 if ( $this->mTitle->getDBkey() === '' ) {
2842                         $status->error( 'cannotdelete',
2843                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2844                         return $status;
2845                 }
2846
2847                 $user = is_null( $user ) ? $wgUser : $user;
2848                 if ( !Hooks::run( 'ArticleDelete',
2849                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2850                 ) ) {
2851                         if ( $status->isOK() ) {
2852                                 // Hook aborted but didn't set a fatal status
2853                                 $status->fatal( 'delete-hook-aborted' );
2854                         }
2855                         return $status;
2856                 }
2857
2858                 $dbw = wfGetDB( DB_MASTER );
2859                 $dbw->startAtomic( __METHOD__ );
2860
2861                 $this->loadPageData( self::READ_LATEST );
2862                 $id = $this->getId();
2863                 // T98706: lock the page from various other updates but avoid using
2864                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2865                 // the revisions queries (which also JOIN on user). Only lock the page
2866                 // row and CAS check on page_latest to see if the trx snapshot matches.
2867                 $lockedLatest = $this->lockAndGetLatest();
2868                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2869                         $dbw->endAtomic( __METHOD__ );
2870                         // Page not there or trx snapshot is stale
2871                         $status->error( 'cannotdelete',
2872                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2873                         return $status;
2874                 }
2875
2876                 // Given the lock above, we can be confident in the title and page ID values
2877                 $namespace = $this->getTitle()->getNamespace();
2878                 $dbKey = $this->getTitle()->getDBkey();
2879
2880                 // At this point we are now comitted to returning an OK
2881                 // status unless some DB query error or other exception comes up.
2882                 // This way callers don't have to call rollback() if $status is bad
2883                 // unless they actually try to catch exceptions (which is rare).
2884
2885                 // we need to remember the old content so we can use it to generate all deletion updates.
2886                 $revision = $this->getRevision();
2887                 try {
2888                         $content = $this->getContent( Revision::RAW );
2889                 } catch ( Exception $ex ) {
2890                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2891                                 . $ex->getMessage() );
2892
2893                         $content = null;
2894                 }
2895
2896                 $fields = Revision::selectFields();
2897                 $bitfield = false;
2898
2899                 // Bitfields to further suppress the content
2900                 if ( $suppress ) {
2901                         $bitfield = Revision::SUPPRESSED_ALL;
2902                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2903                 }
2904
2905                 // For now, shunt the revision data into the archive table.
2906                 // Text is *not* removed from the text table; bulk storage
2907                 // is left intact to avoid breaking block-compression or
2908                 // immutable storage schemes.
2909                 // In the future, we may keep revisions and mark them with
2910                 // the rev_deleted field, which is reserved for this purpose.
2911
2912                 // Get all of the page revisions
2913                 $res = $dbw->select(
2914                         'revision',
2915                         $fields,
2916                         [ 'rev_page' => $id ],
2917                         __METHOD__,
2918                         'FOR UPDATE'
2919                 );
2920                 // Build their equivalent archive rows
2921                 $rowsInsert = [];
2922                 foreach ( $res as $row ) {
2923                         $rowInsert = [
2924                                 'ar_namespace'  => $namespace,
2925                                 'ar_title'      => $dbKey,
2926                                 'ar_comment'    => $row->rev_comment,
2927                                 'ar_user'       => $row->rev_user,
2928                                 'ar_user_text'  => $row->rev_user_text,
2929                                 'ar_timestamp'  => $row->rev_timestamp,
2930                                 'ar_minor_edit' => $row->rev_minor_edit,
2931                                 'ar_rev_id'     => $row->rev_id,
2932                                 'ar_parent_id'  => $row->rev_parent_id,
2933                                 'ar_text_id'    => $row->rev_text_id,
2934                                 'ar_text'       => '',
2935                                 'ar_flags'      => '',
2936                                 'ar_len'        => $row->rev_len,
2937                                 'ar_page_id'    => $id,
2938                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2939                                 'ar_sha1'       => $row->rev_sha1,
2940                         ];
2941                         if ( $wgContentHandlerUseDB ) {
2942                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2943                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2944                         }
2945                         $rowsInsert[] = $rowInsert;
2946                 }
2947                 // Copy them into the archive table
2948                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2949                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2950                 $archivedRevisionCount = $dbw->affectedRows();
2951
2952                 // Clone the title and wikiPage, so we have the information we need when
2953                 // we log and run the ArticleDeleteComplete hook.
2954                 $logTitle = clone $this->mTitle;
2955                 $wikiPageBeforeDelete = clone $this;
2956
2957                 // Now that it's safely backed up, delete it
2958                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2959                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2960
2961                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2962                 $logtype = $suppress ? 'suppress' : 'delete';
2963
2964                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2965                 $logEntry->setPerformer( $user );
2966                 $logEntry->setTarget( $logTitle );
2967                 $logEntry->setComment( $reason );
2968                 $logEntry->setTags( $tags );
2969                 $logid = $logEntry->insert();
2970
2971                 $dbw->onTransactionPreCommitOrIdle(
2972                         function () use ( $dbw, $logEntry, $logid ) {
2973                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2974                                 $logEntry->publish( $logid );
2975                         },
2976                         __METHOD__
2977                 );
2978
2979                 $dbw->endAtomic( __METHOD__ );
2980
2981                 $this->doDeleteUpdates( $id, $content, $revision );
2982
2983                 Hooks::run( 'ArticleDeleteComplete', [
2984                         &$wikiPageBeforeDelete,
2985                         &$user,
2986                         $reason,
2987                         $id,
2988                         $content,
2989                         $logEntry,
2990                         $archivedRevisionCount
2991                 ] );
2992                 $status->value = $logid;
2993
2994                 // Show log excerpt on 404 pages rather than just a link
2995                 $cache = ObjectCache::getMainStashInstance();
2996                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2997                 $cache->set( $key, 1, $cache::TTL_DAY );
2998
2999                 return $status;
3000         }
3001
3002         /**
3003          * Lock the page row for this title+id and return page_latest (or 0)
3004          *
3005          * @return integer Returns 0 if no row was found with this title+id
3006          * @since 1.27
3007          */
3008         public function lockAndGetLatest() {
3009                 return (int)wfGetDB( DB_MASTER )->selectField(
3010                         'page',
3011                         'page_latest',
3012                         [
3013                                 'page_id' => $this->getId(),
3014                                 // Typically page_id is enough, but some code might try to do
3015                                 // updates assuming the title is the same, so verify that
3016                                 'page_namespace' => $this->getTitle()->getNamespace(),
3017                                 'page_title' => $this->getTitle()->getDBkey()
3018                         ],
3019                         __METHOD__,
3020                         [ 'FOR UPDATE' ]
3021                 );
3022         }
3023
3024         /**
3025          * Do some database updates after deletion
3026          *
3027          * @param int $id The page_id value of the page being deleted
3028          * @param Content|null $content Optional page content to be used when determining
3029          *   the required updates. This may be needed because $this->getContent()
3030          *   may already return null when the page proper was deleted.
3031          * @param Revision|null $revision The latest page revision
3032          */
3033         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
3034                 try {
3035                         $countable = $this->isCountable();
3036                 } catch ( Exception $ex ) {
3037                         // fallback for deleting broken pages for which we cannot load the content for
3038                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3039                         $countable = false;
3040                 }
3041
3042                 // Update site status
3043                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3044
3045                 // Delete pagelinks, update secondary indexes, etc
3046                 $updates = $this->getDeletionUpdates( $content );
3047                 foreach ( $updates as $update ) {
3048                         DeferredUpdates::addUpdate( $update );
3049                 }
3050
3051                 // Reparse any pages transcluding this page
3052                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3053
3054                 // Reparse any pages including this image
3055                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3056                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3057                 }
3058
3059                 // Clear caches
3060                 WikiPage::onArticleDelete( $this->mTitle );
3061                 ResourceLoaderWikiModule::invalidateModuleCache(
3062                         $this->mTitle, $revision, null, wfWikiID()
3063                 );
3064
3065                 // Reset this object and the Title object
3066                 $this->loadFromRow( false, self::READ_LATEST );
3067
3068                 // Search engine
3069                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3070         }
3071
3072         /**
3073          * Roll back the most recent consecutive set of edits to a page
3074          * from the same user; fails if there are no eligible edits to
3075          * roll back to, e.g. user is the sole contributor. This function
3076          * performs permissions checks on $user, then calls commitRollback()
3077          * to do the dirty work
3078          *
3079          * @todo Separate the business/permission stuff out from backend code
3080          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3081          *
3082          * @param string $fromP Name of the user whose edits to rollback.
3083          * @param string $summary Custom summary. Set to default summary if empty.
3084          * @param string $token Rollback token.
3085          * @param bool $bot If true, mark all reverted edits as bot.
3086          *
3087          * @param array $resultDetails Array contains result-specific array of additional values
3088          *    'alreadyrolled' : 'current' (rev)
3089          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3090          *
3091          * @param User $user The user performing the rollback
3092          * @param array|null $tags Change tags to apply to the rollback
3093          * Callers are responsible for permission checks
3094          * (with ChangeTags::canAddTagsAccompanyingChange)
3095          *
3096          * @return array Array of errors, each error formatted as
3097          *   array(messagekey, param1, param2, ...).
3098          * On success, the array is empty.  This array can also be passed to
3099          * OutputPage::showPermissionsErrorPage().
3100          */
3101         public function doRollback(
3102                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3103         ) {
3104                 $resultDetails = null;
3105
3106                 // Check permissions
3107                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3108                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3109                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3110
3111                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3112                         $errors[] = [ 'sessionfailure' ];
3113                 }
3114
3115                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3116                         $errors[] = [ 'actionthrottledtext' ];
3117                 }
3118
3119                 // If there were errors, bail out now
3120                 if ( !empty( $errors ) ) {
3121                         return $errors;
3122                 }
3123
3124                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3125         }
3126
3127         /**
3128          * Backend implementation of doRollback(), please refer there for parameter
3129          * and return value documentation
3130          *
3131          * NOTE: This function does NOT check ANY permissions, it just commits the
3132          * rollback to the DB. Therefore, you should only call this function direct-
3133          * ly if you want to use custom permissions checks. If you don't, use
3134          * doRollback() instead.
3135          * @param string $fromP Name of the user whose edits to rollback.
3136          * @param string $summary Custom summary. Set to default summary if empty.
3137          * @param bool $bot If true, mark all reverted edits as bot.
3138          *
3139          * @param array $resultDetails Contains result-specific array of additional values
3140          * @param User $guser The user performing the rollback
3141          * @param array|null $tags Change tags to apply to the rollback
3142          * Callers are responsible for permission checks
3143          * (with ChangeTags::canAddTagsAccompanyingChange)
3144          *
3145          * @return array
3146          */
3147         public function commitRollback( $fromP, $summary, $bot,
3148                 &$resultDetails, User $guser, $tags = null
3149         ) {
3150                 global $wgUseRCPatrol, $wgContLang;
3151
3152                 $dbw = wfGetDB( DB_MASTER );
3153
3154                 if ( wfReadOnly() ) {
3155                         return [ [ 'readonlytext' ] ];
3156                 }
3157
3158                 // Get the last editor
3159                 $current = $this->getRevision();
3160                 if ( is_null( $current ) ) {
3161                         // Something wrong... no page?
3162                         return [ [ 'notanarticle' ] ];
3163                 }
3164
3165                 $from = str_replace( '_', ' ', $fromP );
3166                 // User name given should match up with the top revision.
3167                 // If the user was deleted then $from should be empty.
3168                 if ( $from != $current->getUserText() ) {
3169                         $resultDetails = [ 'current' => $current ];
3170                         return [ [ 'alreadyrolled',
3171                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3172                                 htmlspecialchars( $fromP ),
3173                                 htmlspecialchars( $current->getUserText() )
3174                         ] ];
3175                 }
3176
3177                 // Get the last edit not by this person...
3178                 // Note: these may not be public values
3179                 $user = intval( $current->getUser( Revision::RAW ) );
3180                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3181                 $s = $dbw->selectRow( 'revision',
3182                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3183                         [ 'rev_page' => $current->getPage(),
3184                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3185                         ], __METHOD__,
3186                         [ 'USE INDEX' => 'page_timestamp',
3187                                 'ORDER BY' => 'rev_timestamp DESC' ]
3188                         );
3189                 if ( $s === false ) {
3190                         // No one else ever edited this page
3191                         return [ [ 'cantrollback' ] ];
3192                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3193                         || $s->rev_deleted & Revision::DELETED_USER
3194                 ) {
3195                         // Only admins can see this text
3196                         return [ [ 'notvisiblerev' ] ];
3197                 }
3198
3199                 // Generate the edit summary if necessary
3200                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3201                 if ( empty( $summary ) ) {
3202                         if ( $from == '' ) { // no public user name
3203                                 $summary = wfMessage( 'revertpage-nouser' );
3204                         } else {
3205                                 $summary = wfMessage( 'revertpage' );
3206                         }
3207                 }
3208
3209                 // Allow the custom summary to use the same args as the default message
3210                 $args = [
3211                         $target->getUserText(), $from, $s->rev_id,
3212                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3213                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3214                 ];
3215                 if ( $summary instanceof Message ) {
3216                         $summary = $summary->params( $args )->inContentLanguage()->text();
3217                 } else {
3218                         $summary = wfMsgReplaceArgs( $summary, $args );
3219                 }
3220
3221                 // Trim spaces on user supplied text
3222                 $summary = trim( $summary );
3223
3224                 // Truncate for whole multibyte characters.
3225                 $summary = $wgContLang->truncate( $summary, 255 );
3226
3227                 // Save
3228                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3229
3230                 if ( $guser->isAllowed( 'minoredit' ) ) {
3231                         $flags |= EDIT_MINOR;
3232                 }
3233
3234                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3235                         $flags |= EDIT_FORCE_BOT;
3236                 }
3237
3238                 $targetContent = $target->getContent();
3239                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3240
3241                 // Actually store the edit
3242                 $status = $this->doEditContent(
3243                         $targetContent,
3244                         $summary,
3245                         $flags,
3246                         $target->getId(),
3247                         $guser,
3248                         null,
3249                         $tags
3250                 );
3251
3252                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3253                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3254                 $set = [];
3255                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3256                         // Mark all reverted edits as bot
3257                         $set['rc_bot'] = 1;
3258                 }
3259
3260                 if ( $wgUseRCPatrol ) {
3261                         // Mark all reverted edits as patrolled
3262                         $set['rc_patrolled'] = 1;
3263                 }
3264
3265                 if ( count( $set ) ) {
3266                         $dbw->update( 'recentchanges', $set,
3267                                 [ /* WHERE */
3268                                         'rc_cur_id' => $current->getPage(),
3269                                         'rc_user_text' => $current->getUserText(),
3270                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3271                                 ],
3272                                 __METHOD__
3273                         );
3274                 }
3275
3276                 if ( !$status->isOK() ) {
3277                         return $status->getErrorsArray();
3278                 }
3279
3280                 // raise error, when the edit is an edit without a new version
3281                 $statusRev = isset( $status->value['revision'] )
3282                         ? $status->value['revision']
3283                         : null;
3284                 if ( !( $statusRev instanceof Revision ) ) {
3285                         $resultDetails = [ 'current' => $current ];
3286                         return [ [ 'alreadyrolled',
3287                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3288                                         htmlspecialchars( $fromP ),
3289                                         htmlspecialchars( $current->getUserText() )
3290                         ] ];
3291                 }
3292
3293                 if ( $changingContentModel ) {
3294                         // If the content model changed during the rollback,
3295                         // make sure it gets logged to Special:Log/contentmodel
3296                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3297                         $log->setPerformer( $guser );
3298                         $log->setTarget( $this->mTitle );
3299                         $log->setComment( $summary );
3300                         $log->setParameters( [
3301                                 '4::oldmodel' => $current->getContentModel(),
3302                                 '5::newmodel' => $targetContent->getModel(),
3303                         ] );
3304
3305                         $logId = $log->insert( $dbw );
3306                         $log->publish( $logId );
3307                 }
3308
3309                 $revId = $statusRev->getId();
3310
3311                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3312
3313                 $resultDetails = [
3314                         'summary' => $summary,
3315                         'current' => $current,
3316                         'target' => $target,
3317                         'newid' => $revId
3318                 ];
3319
3320                 return [];
3321         }
3322
3323         /**
3324          * The onArticle*() functions are supposed to be a kind of hooks
3325          * which should be called whenever any of the specified actions
3326          * are done.
3327          *
3328          * This is a good place to put code to clear caches, for instance.
3329          *
3330          * This is called on page move and undelete, as well as edit
3331          *
3332          * @param Title $title
3333          */
3334         public static function onArticleCreate( Title $title ) {
3335                 // Update existence markers on article/talk tabs...
3336                 $other = $title->getOtherPage();
3337
3338                 $other->purgeSquid();
3339
3340                 $title->touchLinks();
3341                 $title->purgeSquid();
3342                 $title->deleteTitleProtection();
3343
3344                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3345
3346                 if ( $title->getNamespace() == NS_CATEGORY ) {
3347                         // Load the Category object, which will schedule a job to create
3348                         // the category table row if necessary. Checking a replica DB is ok
3349                         // here, in the worst case it'll run an unnecessary recount job on
3350                         // a category that probably doesn't have many members.
3351                         Category::newFromTitle( $title )->getID();
3352                 }
3353         }
3354
3355         /**
3356          * Clears caches when article is deleted
3357          *
3358          * @param Title $title
3359          */
3360         public static function onArticleDelete( Title $title ) {
3361                 global $wgContLang;
3362
3363                 // Update existence markers on article/talk tabs...
3364                 $other = $title->getOtherPage();
3365
3366                 $other->purgeSquid();
3367
3368                 $title->touchLinks();
3369                 $title->purgeSquid();
3370
3371                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3372
3373                 // File cache
3374                 HTMLFileCache::clearFileCache( $title );
3375                 InfoAction::invalidateCache( $title );
3376
3377                 // Messages
3378                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3379                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3380
3381                         if ( $wgContLang->hasVariants() ) {
3382                                 $wgContLang->updateConversionTable( $title );
3383                         }
3384                 }
3385
3386                 // Images
3387                 if ( $title->getNamespace() == NS_FILE ) {
3388                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3389                 }
3390
3391                 // User talk pages
3392                 if ( $title->getNamespace() == NS_USER_TALK ) {
3393                         $user = User::newFromName( $title->getText(), false );
3394                         if ( $user ) {
3395                                 $user->setNewtalk( false );
3396                         }
3397                 }
3398
3399                 // Image redirects
3400                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3401         }
3402
3403         /**
3404          * Purge caches on page update etc
3405          *
3406          * @param Title $title
3407          * @param Revision|null $revision Revision that was just saved, may be null
3408          */
3409         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3410                 // Invalidate caches of articles which include this page
3411                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3412
3413                 // Invalidate the caches of all pages which redirect here
3414                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3415
3416                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3417
3418                 // Purge CDN for this page only
3419                 $title->purgeSquid();
3420                 // Clear file cache for this page only
3421                 HTMLFileCache::clearFileCache( $title );
3422
3423                 $revid = $revision ? $revision->getId() : null;
3424                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3425                         InfoAction::invalidateCache( $title, $revid );
3426                 } );
3427         }
3428
3429         /**#@-*/
3430
3431         /**
3432          * Returns a list of categories this page is a member of.
3433          * Results will include hidden categories
3434          *
3435          * @return TitleArray
3436          */
3437         public function getCategories() {
3438                 $id = $this->getId();
3439                 if ( $id == 0 ) {
3440                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3441                 }
3442
3443                 $dbr = wfGetDB( DB_REPLICA );
3444                 $res = $dbr->select( 'categorylinks',
3445                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3446                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3447                         // as not being aliases, and NS_CATEGORY is numeric
3448                         [ 'cl_from' => $id ],
3449                         __METHOD__ );
3450
3451                 return TitleArray::newFromResult( $res );
3452         }
3453
3454         /**
3455          * Returns a list of hidden categories this page is a member of.
3456          * Uses the page_props and categorylinks tables.
3457          *
3458          * @return array Array of Title objects
3459          */
3460         public function getHiddenCategories() {
3461                 $result = [];
3462                 $id = $this->getId();
3463
3464                 if ( $id == 0 ) {
3465                         return [];
3466                 }
3467
3468                 $dbr = wfGetDB( DB_REPLICA );
3469                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3470                         [ 'cl_to' ],
3471                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3472                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3473                         __METHOD__ );
3474
3475                 if ( $res !== false ) {
3476                         foreach ( $res as $row ) {
3477                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3478                         }
3479                 }
3480
3481                 return $result;
3482         }
3483
3484         /**
3485          * Auto-generates a deletion reason
3486          *
3487          * @param bool &$hasHistory Whether the page has a history
3488          * @return string|bool String containing deletion reason or empty string, or boolean false
3489          *    if no revision occurred
3490          */
3491         public function getAutoDeleteReason( &$hasHistory ) {
3492                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3493         }
3494
3495         /**
3496          * Update all the appropriate counts in the category table, given that
3497          * we've added the categories $added and deleted the categories $deleted.
3498          *
3499          * This should only be called from deferred updates or jobs to avoid contention.
3500          *
3501          * @param array $added The names of categories that were added
3502          * @param array $deleted The names of categories that were deleted
3503          * @param integer $id Page ID (this should be the original deleted page ID)
3504          */
3505         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3506                 $id = $id ?: $this->getId();
3507                 $ns = $this->getTitle()->getNamespace();
3508
3509                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3510                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3511                 if ( $ns == NS_CATEGORY ) {
3512                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3513                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3514                 } elseif ( $ns == NS_FILE ) {
3515                         $addFields[] = 'cat_files = cat_files + 1';
3516                         $removeFields[] = 'cat_files = cat_files - 1';
3517                 }
3518
3519                 $dbw = wfGetDB( DB_MASTER );
3520
3521                 if ( count( $added ) ) {
3522                         $existingAdded = $dbw->selectFieldValues(
3523                                 'category',
3524                                 'cat_title',
3525                                 [ 'cat_title' => $added ],
3526                                 __METHOD__
3527                         );
3528
3529                         // For category rows that already exist, do a plain
3530                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3531                         // to avoid creating gaps in the cat_id sequence.
3532                         if ( count( $existingAdded ) ) {
3533                                 $dbw->update(
3534                                         'category',
3535                                         $addFields,
3536                                         [ 'cat_title' => $existingAdded ],
3537                                         __METHOD__
3538                                 );
3539                         }
3540
3541                         $missingAdded = array_diff( $added, $existingAdded );
3542                         if ( count( $missingAdded ) ) {
3543                                 $insertRows = [];
3544                                 foreach ( $missingAdded as $cat ) {
3545                                         $insertRows[] = [
3546                                                 'cat_title'   => $cat,
3547                                                 'cat_pages'   => 1,
3548                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3549                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3550                                         ];
3551                                 }
3552                                 $dbw->upsert(
3553                                         'category',
3554                                         $insertRows,
3555                                         [ 'cat_title' ],
3556                                         $addFields,
3557                                         __METHOD__
3558                                 );
3559                         }
3560                 }
3561
3562                 if ( count( $deleted ) ) {
3563                         $dbw->update(
3564                                 'category',
3565                                 $removeFields,
3566                                 [ 'cat_title' => $deleted ],
3567                                 __METHOD__
3568                         );
3569                 }
3570
3571                 foreach ( $added as $catName ) {
3572                         $cat = Category::newFromName( $catName );
3573                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3574                 }
3575
3576                 foreach ( $deleted as $catName ) {
3577                         $cat = Category::newFromName( $catName );
3578                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3579                 }
3580
3581                 // Refresh counts on categories that should be empty now, to
3582                 // trigger possible deletion. Check master for the most
3583                 // up-to-date cat_pages.
3584                 if ( count( $deleted ) ) {
3585                         $rows = $dbw->select(
3586                                 'category',
3587                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3588                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3589                                 __METHOD__
3590                         );
3591                         foreach ( $rows as $row ) {
3592                                 $cat = Category::newFromRow( $row );
3593                                 $cat->refreshCounts();
3594                         }
3595                 }
3596         }
3597
3598         /**
3599          * Opportunistically enqueue link update jobs given fresh parser output if useful
3600          *
3601          * @param ParserOutput $parserOutput Current version page output
3602          * @since 1.25
3603          */
3604         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3605                 if ( wfReadOnly() ) {
3606                         return;
3607                 }
3608
3609                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3610                         [ $this, $this->mTitle, $parserOutput ]
3611                 ) ) {
3612                         return;
3613                 }
3614
3615                 $config = RequestContext::getMain()->getConfig();
3616
3617                 $params = [
3618                         'isOpportunistic' => true,
3619                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3620                 ];
3621
3622                 if ( $this->mTitle->areRestrictionsCascading() ) {
3623                         // If the page is cascade protecting, the links should really be up-to-date
3624                         JobQueueGroup::singleton()->lazyPush(
3625                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3626                         );
3627                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3628                         // Assume the output contains "dynamic" time/random based magic words.
3629                         // Only update pages that expired due to dynamic content and NOT due to edits
3630                         // to referenced templates/files. When the cache expires due to dynamic content,
3631                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3632                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3633                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3634                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3635                                 // If a page is uncacheable, do not keep spamming a job for it.
3636                                 // Although it would be de-duplicated, it would still waste I/O.
3637                                 $cache = ObjectCache::getLocalClusterInstance();
3638                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3639                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3640                                 if ( $cache->add( $key, time(), $ttl ) ) {
3641                                         JobQueueGroup::singleton()->lazyPush(
3642                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3643                                         );
3644                                 }
3645                         }
3646                 }
3647         }
3648
3649         /**
3650          * Returns a list of updates to be performed when this page is deleted. The
3651          * updates should remove any information about this page from secondary data
3652          * stores such as links tables.
3653          *
3654          * @param Content|null $content Optional Content object for determining the
3655          *   necessary updates.
3656          * @return DeferrableUpdate[]
3657          */
3658         public function getDeletionUpdates( Content $content = null ) {
3659                 if ( !$content ) {
3660                         // load content object, which may be used to determine the necessary updates.
3661                         // XXX: the content may not be needed to determine the updates.
3662                         try {
3663                                 $content = $this->getContent( Revision::RAW );
3664                         } catch ( Exception $ex ) {
3665                                 // If we can't load the content, something is wrong. Perhaps that's why
3666                                 // the user is trying to delete the page, so let's not fail in that case.
3667                                 // Note that doDeleteArticleReal() will already have logged an issue with
3668                                 // loading the content.
3669                         }
3670                 }
3671
3672                 if ( !$content ) {
3673                         $updates = [];
3674                 } else {
3675                         $updates = $content->getDeletionUpdates( $this );
3676                 }
3677
3678                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3679                 return $updates;
3680         }
3681
3682         /**
3683          * Whether this content displayed on this page
3684          * comes from the local database
3685          *
3686          * @since 1.28
3687          * @return bool
3688          */
3689         public function isLocal() {
3690                 return true;
3691         }
3692
3693         /**
3694          * The display name for the site this content
3695          * come from. If a subclass overrides isLocal(),
3696          * this could return something other than the
3697          * current site name
3698          *
3699          * @since 1.28
3700          * @return string
3701          */
3702         public function getWikiDisplayName() {
3703                 global $wgSitename;
3704                 return $wgSitename;
3705         }
3706
3707         /**
3708          * Get the source URL for the content on this page,
3709          * typically the canonical URL, but may be a remote
3710          * link if the content comes from another site
3711          *
3712          * @since 1.28
3713          * @return string
3714          */
3715         public function getSourceURL() {
3716                 return $this->getTitle()->getCanonicalURL();
3717         }
3718 }