includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 $page = null;
 125                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 126                         return $page;
 127                 }
 128
 129                 switch ( $ns ) {
 130                         case NS_FILE:
 131                                 $page = new WikiFilePage( $title );
 132                                 break;
 133                         case NS_CATEGORY:
 134                                 $page = new WikiCategoryPage( $title );
 135                                 break;
 136                         default:
 137                                 $page = new WikiPage( $title );
 138                 }
 139
 140                 return $page;
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          *
 146          * @param int $id Article ID to load
 147          * @param string|int $from One of the following values:
 148          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 150          *
 151          * @return WikiPage|null
 152          */
 153         public static function newFromID( $id, $from = 'fromdb' ) {
 154                 // page id's are never 0 or negative, see bug 61166
 155                 if ( $id < 1 ) {
 156                         return null;
 157                 }
 158
 159                 $from = self::convertSelectType( $from );
 160                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 161                 $row = $db->selectRow(
 162                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 163                 if ( !$row ) {
 164                         return null;
 165                 }
 166                 return self::newFromRow( $row, $from );
 167         }
 168
 169         /**
 170          * Constructor from a database row
 171          *
 172          * @since 1.20
 173          * @param object $row Database row containing at least fields returned by selectFields().
 174          * @param string|int $from Source of $data:
 175          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 176          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 177          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 178          * @return WikiPage
 179          */
 180         public static function newFromRow( $row, $from = 'fromdb' ) {
 181                 $page = self::factory( Title::newFromRow( $row ) );
 182                 $page->loadFromRow( $row, $from );
 183                 return $page;
 184         }
 185
 186         /**
 187          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 188          *
 189          * @param object|string|int $type
 190          * @return mixed
 191          */
 192         private static function convertSelectType( $type ) {
 193                 switch ( $type ) {
 194                 case 'fromdb':
 195                         return self::READ_NORMAL;
 196                 case 'fromdbmaster':
 197                         return self::READ_LATEST;
 198                 case 'forupdate':
 199                         return self::READ_LOCKING;
 200                 default:
 201                         // It may already be an integer or whatever else
 202                         return $type;
 203                 }
 204         }
 205
 206         /**
 207          * @todo Move this UI stuff somewhere else
 208          *
 209          * @see ContentHandler::getActionOverrides
 210          */
 211         public function getActionOverrides() {
 212                 return $this->getContentHandler()->getActionOverrides();
 213         }
 214
 215         /**
 216          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 217          *
 218          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 219          *
 220          * @return ContentHandler
 221          *
 222          * @since 1.21
 223          */
 224         public function getContentHandler() {
 225                 return ContentHandler::getForModelID( $this->getContentModel() );
 226         }
 227
 228         /**
 229          * Get the title object of the article
 230          * @return Title Title object of this page
 231          */
 232         public function getTitle() {
 233                 return $this->mTitle;
 234         }
 235
 236         /**
 237          * Clear the object
 238          * @return void
 239          */
 240         public function clear() {
 241                 $this->mDataLoaded = false;
 242                 $this->mDataLoadedFrom = self::READ_NONE;
 243
 244                 $this->clearCacheFields();
 245         }
 246
 247         /**
 248          * Clear the object cache fields
 249          * @return void
 250          */
 251         protected function clearCacheFields() {
 252                 $this->mId = null;
 253                 $this->mRedirectTarget = null; // Title object if set
 254                 $this->mLastRevision = null; // Latest revision
 255                 $this->mTouched = '19700101000000';
 256                 $this->mLinksUpdated = '19700101000000';
 257                 $this->mTimestamp = '';
 258                 $this->mIsRedirect = false;
 259                 $this->mLatest = false;
 260                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 261                 // the requested rev ID and content against the cached one for equality. For most
 262                 // content types, the output should not change during the lifetime of this cache.
 263                 // Clearing it can cause extra parses on edit for no reason.
 264         }
 265
 266         /**
 267          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 268          * @return void
 269          * @since 1.23
 270          */
 271         public function clearPreparedEdit() {
 272                 $this->mPreparedEdit = false;
 273         }
 274
 275         /**
 276          * Return the list of revision fields that should be selected to create
 277          * a new page.
 278          *
 279          * @return array
 280          */
 281         public static function selectFields() {
 282                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 283
 284                 $fields = [
 285                         'page_id',
 286                         'page_namespace',
 287                         'page_title',
 288                         'page_restrictions',
 289                         'page_is_redirect',
 290                         'page_is_new',
 291                         'page_random',
 292                         'page_touched',
 293                         'page_links_updated',
 294                         'page_latest',
 295                         'page_len',
 296                 ];
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 if ( $wgPageLanguageUseDB ) {
 303                         $fields[] = 'page_lang';
 304                 }
 305
 306                 return $fields;
 307         }
 308
 309         /**
 310          * Fetch a page record with the given conditions
 311          * @param IDatabase $dbr
 312          * @param array $conditions
 313          * @param array $options
 314          * @return object|bool Database result resource, or false on failure
 315          */
 316         protected function pageData( $dbr, $conditions, $options = [] ) {
 317                 $fields = self::selectFields();
 318
 319                 // Avoid PHP 7.1 warning of passing $this by reference
 320                 $wikiPage = $this;
 321
 322                 Hooks::run( 'ArticlePageDataBefore', [ &$wikiPage, &$fields ] );
 323
 324                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 325
 326                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 327
 328                 return $row;
 329         }
 330
 331         /**
 332          * Fetch a page record matching the Title object's namespace and title
 333          * using a sanitized title string
 334          *
 335          * @param IDatabase $dbr
 336          * @param Title $title
 337          * @param array $options
 338          * @return object|bool Database result resource, or false on failure
 339          */
 340         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 341                 return $this->pageData( $dbr, [
 342                         'page_namespace' => $title->getNamespace(),
 343                         'page_title' => $title->getDBkey() ], $options );
 344         }
 345
 346         /**
 347          * Fetch a page record matching the requested ID
 348          *
 349          * @param IDatabase $dbr
 350          * @param int $id
 351          * @param array $options
 352          * @return object|bool Database result resource, or false on failure
 353          */
 354         public function pageDataFromId( $dbr, $id, $options = [] ) {
 355                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 356         }
 357
 358         /**
 359          * Load the object from a given source by title
 360          *
 361          * @param object|string|int $from One of the following:
 362          *   - A DB query result object.
 363          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 364          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 365          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 366          *     using SELECT FOR UPDATE.
 367          *
 368          * @return void
 369          */
 370         public function loadPageData( $from = 'fromdb' ) {
 371                 $from = self::convertSelectType( $from );
 372                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 373                         // We already have the data from the correct location, no need to load it twice.
 374                         return;
 375                 }
 376
 377                 if ( is_int( $from ) ) {
 378                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 379                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 380
 381                         if ( !$data
 382                                 && $index == DB_REPLICA
 383                                 && wfGetLB()->getServerCount() > 1
 384                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 385                         ) {
 386                                 $from = self::READ_LATEST;
 387                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 388                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 389                         }
 390                 } else {
 391                         // No idea from where the caller got this data, assume replica DB.
 392                         $data = $from;
 393                         $from = self::READ_NORMAL;
 394                 }
 395
 396                 $this->loadFromRow( $data, $from );
 397         }
 398
 399         /**
 400          * Load the object from a database row
 401          *
 402          * @since 1.20
 403          * @param object|bool $data DB row containing fields returned by selectFields() or false
 404          * @param string|int $from One of the following:
 405          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 406          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 407          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 408          *          the master DB using SELECT FOR UPDATE
 409          */
 410         public function loadFromRow( $data, $from ) {
 411                 $lc = LinkCache::singleton();
 412                 $lc->clearLink( $this->mTitle );
 413
 414                 if ( $data ) {
 415                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 416
 417                         $this->mTitle->loadFromRow( $data );
 418
 419                         // Old-fashioned restrictions
 420                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 421
 422                         $this->mId = intval( $data->page_id );
 423                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 424                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 425                         $this->mIsRedirect = intval( $data->page_is_redirect );
 426                         $this->mLatest = intval( $data->page_latest );
 427                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 428                         // Double-check the ID of any cached latest Revision object for consistency.
 429                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 430                                 $this->mLastRevision = null;
 431                                 $this->mTimestamp = '';
 432                         }
 433                 } else {
 434                         $lc->addBadLinkObj( $this->mTitle );
 435
 436                         $this->mTitle->loadFromRow( false );
 437
 438                         $this->clearCacheFields();
 439
 440                         $this->mId = 0;
 441                 }
 442
 443                 $this->mDataLoaded = true;
 444                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 445         }
 446
 447         /**
 448          * @return int Page ID
 449          */
 450         public function getId() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454                 return $this->mId;
 455         }
 456
 457         /**
 458          * @return bool Whether or not the page exists in the database
 459          */
 460         public function exists() {
 461                 if ( !$this->mDataLoaded ) {
 462                         $this->loadPageData();
 463                 }
 464                 return $this->mId > 0;
 465         }
 466
 467         /**
 468          * Check if this page is something we're going to be showing
 469          * some sort of sensible content for. If we return false, page
 470          * views (plain action=view) will return an HTTP 404 response,
 471          * so spiders and robots can know they're following a bad link.
 472          *
 473          * @return bool
 474          */
 475         public function hasViewableContent() {
 476                 return $this->mTitle->isKnown();
 477         }
 478
 479         /**
 480          * Tests if the article content represents a redirect
 481          *
 482          * @return bool
 483          */
 484         public function isRedirect() {
 485                 if ( !$this->mDataLoaded ) {
 486                         $this->loadPageData();
 487                 }
 488
 489                 return (bool)$this->mIsRedirect;
 490         }
 491
 492         /**
 493          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 494          *
 495          * Will use the revisions actual content model if the page exists,
 496          * and the page's default if the page doesn't exist yet.
 497          *
 498          * @return string
 499          *
 500          * @since 1.21
 501          */
 502         public function getContentModel() {
 503                 if ( $this->exists() ) {
 504                         $cache = ObjectCache::getMainWANInstance();
 505
 506                         return $cache->getWithSetCallback(
 507                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 508                                 $cache::TTL_MONTH,
 509                                 function () {
 510                                         $rev = $this->getRevision();
 511                                         if ( $rev ) {
 512                                                 // Look at the revision's actual content model
 513                                                 return $rev->getContentModel();
 514                                         } else {
 515                                                 $title = $this->mTitle->getPrefixedDBkey();
 516                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 517                                                 return $this->mTitle->getContentModel();
 518                                         }
 519                                 }
 520                         );
 521                 }
 522
 523                 // use the default model for this page
 524                 return $this->mTitle->getContentModel();
 525         }
 526
 527         /**
 528          * Loads page_touched and returns a value indicating if it should be used
 529          * @return bool True if this page exists and is not a redirect
 530          */
 531         public function checkTouched() {
 532                 if ( !$this->mDataLoaded ) {
 533                         $this->loadPageData();
 534                 }
 535                 return ( $this->mId && !$this->mIsRedirect );
 536         }
 537
 538         /**
 539          * Get the page_touched field
 540          * @return string Containing GMT timestamp
 541          */
 542         public function getTouched() {
 543                 if ( !$this->mDataLoaded ) {
 544                         $this->loadPageData();
 545                 }
 546                 return $this->mTouched;
 547         }
 548
 549         /**
 550          * Get the page_links_updated field
 551          * @return string|null Containing GMT timestamp
 552          */
 553         public function getLinksTimestamp() {
 554                 if ( !$this->mDataLoaded ) {
 555                         $this->loadPageData();
 556                 }
 557                 return $this->mLinksUpdated;
 558         }
 559
 560         /**
 561          * Get the page_latest field
 562          * @return int The rev_id of current revision
 563          */
 564         public function getLatest() {
 565                 if ( !$this->mDataLoaded ) {
 566                         $this->loadPageData();
 567                 }
 568                 return (int)$this->mLatest;
 569         }
 570
 571         /**
 572          * Get the Revision object of the oldest revision
 573          * @return Revision|null
 574          */
 575         public function getOldestRevision() {
 576
 577                 // Try using the replica DB first, then try the master
 578                 $continue = 2;
 579                 $db = wfGetDB( DB_REPLICA );
 580                 $revSelectFields = Revision::selectFields();
 581
 582                 $row = null;
 583                 while ( $continue ) {
 584                         $row = $db->selectRow(
 585                                 [ 'page', 'revision' ],
 586                                 $revSelectFields,
 587                                 [
 588                                         'page_namespace' => $this->mTitle->getNamespace(),
 589                                         'page_title' => $this->mTitle->getDBkey(),
 590                                         'rev_page = page_id'
 591                                 ],
 592                                 __METHOD__,
 593                                 [
 594                                         'ORDER BY' => 'rev_timestamp ASC'
 595                                 ]
 596                         );
 597
 598                         if ( $row ) {
 599                                 $continue = 0;
 600                         } else {
 601                                 $db = wfGetDB( DB_MASTER );
 602                                 $continue--;
 603                         }
 604                 }
 605
 606                 return $row ? Revision::newFromRow( $row ) : null;
 607         }
 608
 609         /**
 610          * Loads everything except the text
 611          * This isn't necessary for all uses, so it's only done if needed.
 612          */
 613         protected function loadLastEdit() {
 614                 if ( $this->mLastRevision !== null ) {
 615                         return; // already loaded
 616                 }
 617
 618                 $latest = $this->getLatest();
 619                 if ( !$latest ) {
 620                         return; // page doesn't exist or is missing page_latest info
 621                 }
 622
 623                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 624                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 625                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 626                         // transactions, where S1 normally only sees changes committed before the first S1
 627                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 628                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 629                         // happened after the first S1 SELECT.
 630                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 631                         $flags = Revision::READ_LOCKING;
 632                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 633                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 634                         // Bug T93976: if page_latest was loaded from the master, fetch the
 635                         // revision from there as well, as it may not exist yet on a replica DB.
 636                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 637                         $flags = Revision::READ_LATEST;
 638                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 639                 } else {
 640                         $dbr = wfGetDB( DB_REPLICA );
 641                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 642                 }
 643
 644                 if ( $revision ) { // sanity
 645                         $this->setLastEdit( $revision );
 646                 }
 647         }
 648
 649         /**
 650          * Set the latest revision
 651          * @param Revision $revision
 652          */
 653         protected function setLastEdit( Revision $revision ) {
 654                 $this->mLastRevision = $revision;
 655                 $this->mTimestamp = $revision->getTimestamp();
 656         }
 657
 658         /**
 659          * Get the latest revision
 660          * @return Revision|null
 661          */
 662         public function getRevision() {
 663                 $this->loadLastEdit();
 664                 if ( $this->mLastRevision ) {
 665                         return $this->mLastRevision;
 666                 }
 667                 return null;
 668         }
 669
 670         /**
 671          * Get the content of the current revision. No side-effects...
 672          *
 673          * @param int $audience One of:
 674          *   Revision::FOR_PUBLIC       to be displayed to all users
 675          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 676          *   Revision::RAW              get the text regardless of permissions
 677          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 678          *   to the $audience parameter
 679          * @return Content|null The content of the current revision
 680          *
 681          * @since 1.21
 682          */
 683         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 684                 $this->loadLastEdit();
 685                 if ( $this->mLastRevision ) {
 686                         return $this->mLastRevision->getContent( $audience, $user );
 687                 }
 688                 return null;
 689         }
 690
 691         /**
 692          * @return string MW timestamp of last article revision
 693          */
 694         public function getTimestamp() {
 695                 // Check if the field has been filled by WikiPage::setTimestamp()
 696                 if ( !$this->mTimestamp ) {
 697                         $this->loadLastEdit();
 698                 }
 699
 700                 return wfTimestamp( TS_MW, $this->mTimestamp );
 701         }
 702
 703         /**
 704          * Set the page timestamp (use only to avoid DB queries)
 705          * @param string $ts MW timestamp of last article revision
 706          * @return void
 707          */
 708         public function setTimestamp( $ts ) {
 709                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 710         }
 711
 712         /**
 713          * @param int $audience One of:
 714          *   Revision::FOR_PUBLIC       to be displayed to all users
 715          *   Revision::FOR_THIS_USER    to be displayed to the given user
 716          *   Revision::RAW              get the text regardless of permissions
 717          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 718          *   to the $audience parameter
 719          * @return int User ID for the user that made the last article revision
 720          */
 721         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 722                 $this->loadLastEdit();
 723                 if ( $this->mLastRevision ) {
 724                         return $this->mLastRevision->getUser( $audience, $user );
 725                 } else {
 726                         return -1;
 727                 }
 728         }
 729
 730         /**
 731          * Get the User object of the user who created the page
 732          * @param int $audience One of:
 733          *   Revision::FOR_PUBLIC       to be displayed to all users
 734          *   Revision::FOR_THIS_USER    to be displayed to the given user
 735          *   Revision::RAW              get the text regardless of permissions
 736          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 737          *   to the $audience parameter
 738          * @return User|null
 739          */
 740         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 741                 $revision = $this->getOldestRevision();
 742                 if ( $revision ) {
 743                         $userName = $revision->getUserText( $audience, $user );
 744                         return User::newFromName( $userName, false );
 745                 } else {
 746                         return null;
 747                 }
 748         }
 749
 750         /**
 751          * @param int $audience One of:
 752          *   Revision::FOR_PUBLIC       to be displayed to all users
 753          *   Revision::FOR_THIS_USER    to be displayed to the given user
 754          *   Revision::RAW              get the text regardless of permissions
 755          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 756          *   to the $audience parameter
 757          * @return string Username of the user that made the last article revision
 758          */
 759         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 760                 $this->loadLastEdit();
 761                 if ( $this->mLastRevision ) {
 762                         return $this->mLastRevision->getUserText( $audience, $user );
 763                 } else {
 764                         return '';
 765                 }
 766         }
 767
 768         /**
 769          * @param int $audience One of:
 770          *   Revision::FOR_PUBLIC       to be displayed to all users
 771          *   Revision::FOR_THIS_USER    to be displayed to the given user
 772          *   Revision::RAW              get the text regardless of permissions
 773          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 774          *   to the $audience parameter
 775          * @return string Comment stored for the last article revision
 776          */
 777         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 778                 $this->loadLastEdit();
 779                 if ( $this->mLastRevision ) {
 780                         return $this->mLastRevision->getComment( $audience, $user );
 781                 } else {
 782                         return '';
 783                 }
 784         }
 785
 786         /**
 787          * Returns true if last revision was marked as "minor edit"
 788          *
 789          * @return bool Minor edit indicator for the last article revision.
 790          */
 791         public function getMinorEdit() {
 792                 $this->loadLastEdit();
 793                 if ( $this->mLastRevision ) {
 794                         return $this->mLastRevision->isMinor();
 795                 } else {
 796                         return false;
 797                 }
 798         }
 799
 800         /**
 801          * Determine whether a page would be suitable for being counted as an
 802          * article in the site_stats table based on the title & its content
 803          *
 804          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 805          *   if false, the current database state will be used
 806          * @return bool
 807          */
 808         public function isCountable( $editInfo = false ) {
 809                 global $wgArticleCountMethod;
 810
 811                 if ( !$this->mTitle->isContentPage() ) {
 812                         return false;
 813                 }
 814
 815                 if ( $editInfo ) {
 816                         $content = $editInfo->pstContent;
 817                 } else {
 818                         $content = $this->getContent();
 819                 }
 820
 821                 if ( !$content || $content->isRedirect() ) {
 822                         return false;
 823                 }
 824
 825                 $hasLinks = null;
 826
 827                 if ( $wgArticleCountMethod === 'link' ) {
 828                         // nasty special case to avoid re-parsing to detect links
 829
 830                         if ( $editInfo ) {
 831                                 // ParserOutput::getLinks() is a 2D array of page links, so
 832                                 // to be really correct we would need to recurse in the array
 833                                 // but the main array should only have items in it if there are
 834                                 // links.
 835                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 836                         } else {
 837                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 838                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 839                         }
 840                 }
 841
 842                 return $content->isCountable( $hasLinks );
 843         }
 844
 845         /**
 846          * If this page is a redirect, get its target
 847          *
 848          * The target will be fetched from the redirect table if possible.
 849          * If this page doesn't have an entry there, call insertRedirect()
 850          * @return Title|null Title object, or null if this page is not a redirect
 851          */
 852         public function getRedirectTarget() {
 853                 if ( !$this->mTitle->isRedirect() ) {
 854                         return null;
 855                 }
 856
 857                 if ( $this->mRedirectTarget !== null ) {
 858                         return $this->mRedirectTarget;
 859                 }
 860
 861                 // Query the redirect table
 862                 $dbr = wfGetDB( DB_REPLICA );
 863                 $row = $dbr->selectRow( 'redirect',
 864                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 865                         [ 'rd_from' => $this->getId() ],
 866                         __METHOD__
 867                 );
 868
 869                 // rd_fragment and rd_interwiki were added later, populate them if empty
 870                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 871                         $this->mRedirectTarget = Title::makeTitle(
 872                                 $row->rd_namespace, $row->rd_title,
 873                                 $row->rd_fragment, $row->rd_interwiki
 874                         );
 875                         return $this->mRedirectTarget;
 876                 }
 877
 878                 // This page doesn't have an entry in the redirect table
 879                 $this->mRedirectTarget = $this->insertRedirect();
 880                 return $this->mRedirectTarget;
 881         }
 882
 883         /**
 884          * Insert an entry for this page into the redirect table if the content is a redirect
 885          *
 886          * The database update will be deferred via DeferredUpdates
 887          *
 888          * Don't call this function directly unless you know what you're doing.
 889          * @return Title|null Title object or null if not a redirect
 890          */
 891         public function insertRedirect() {
 892                 $content = $this->getContent();
 893                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 894                 if ( !$retval ) {
 895                         return null;
 896                 }
 897
 898                 // Update the DB post-send if the page has not cached since now
 899                 $that = $this;
 900                 $latest = $this->getLatest();
 901                 DeferredUpdates::addCallableUpdate(
 902                         function () use ( $that, $retval, $latest ) {
 903                                 $that->insertRedirectEntry( $retval, $latest );
 904                         },
 905                         DeferredUpdates::POSTSEND,
 906                         wfGetDB( DB_MASTER )
 907                 );
 908
 909                 return $retval;
 910         }
 911
 912         /**
 913          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 914          * @param Title $rt Redirect target
 915          * @param int|null $oldLatest Prior page_latest for check and set
 916          */
 917         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 918                 $dbw = wfGetDB( DB_MASTER );
 919                 $dbw->startAtomic( __METHOD__ );
 920
 921                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 922                         $dbw->upsert(
 923                                 'redirect',
 924                                 [
 925                                         'rd_from' => $this->getId(),
 926                                         'rd_namespace' => $rt->getNamespace(),
 927                                         'rd_title' => $rt->getDBkey(),
 928                                         'rd_fragment' => $rt->getFragment(),
 929                                         'rd_interwiki' => $rt->getInterwiki(),
 930                                 ],
 931                                 [ 'rd_from' ],
 932                                 [
 933                                         'rd_namespace' => $rt->getNamespace(),
 934                                         'rd_title' => $rt->getDBkey(),
 935                                         'rd_fragment' => $rt->getFragment(),
 936                                         'rd_interwiki' => $rt->getInterwiki(),
 937                                 ],
 938                                 __METHOD__
 939                         );
 940                 }
 941
 942                 $dbw->endAtomic( __METHOD__ );
 943         }
 944
 945         /**
 946          * Get the Title object or URL this page redirects to
 947          *
 948          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 949          */
 950         public function followRedirect() {
 951                 return $this->getRedirectURL( $this->getRedirectTarget() );
 952         }
 953
 954         /**
 955          * Get the Title object or URL to use for a redirect. We use Title
 956          * objects for same-wiki, non-special redirects and URLs for everything
 957          * else.
 958          * @param Title $rt Redirect target
 959          * @return bool|Title|string False, Title object of local target, or string with URL
 960          */
 961         public function getRedirectURL( $rt ) {
 962                 if ( !$rt ) {
 963                         return false;
 964                 }
 965
 966                 if ( $rt->isExternal() ) {
 967                         if ( $rt->isLocal() ) {
 968                                 // Offsite wikis need an HTTP redirect.
 969                                 // This can be hard to reverse and may produce loops,
 970                                 // so they may be disabled in the site configuration.
 971                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 972                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 973                         } else {
 974                                 // External pages without "local" bit set are not valid
 975                                 // redirect targets
 976                                 return false;
 977                         }
 978                 }
 979
 980                 if ( $rt->isSpecialPage() ) {
 981                         // Gotta handle redirects to special pages differently:
 982                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 983                         // Some pages are not valid targets.
 984                         if ( $rt->isValidRedirectTarget() ) {
 985                                 return $rt->getFullURL();
 986                         } else {
 987                                 return false;
 988                         }
 989                 }
 990
 991                 return $rt;
 992         }
 993
 994         /**
 995          * Get a list of users who have edited this article, not including the user who made
 996          * the most recent revision, which you can get from $article->getUser() if you want it
 997          * @return UserArrayFromResult
 998          */
 999         public function getContributors() {
1000                 // @todo FIXME: This is expensive; cache this info somewhere.
1001
1002                 $dbr = wfGetDB( DB_REPLICA );
1003
1004                 if ( $dbr->implicitGroupby() ) {
1005                         $realNameField = 'user_real_name';
1006                 } else {
1007                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1008                 }
1009
1010                 $tables = [ 'revision', 'user' ];
1011
1012                 $fields = [
1013                         'user_id' => 'rev_user',
1014                         'user_name' => 'rev_user_text',
1015                         $realNameField,
1016                         'timestamp' => 'MAX(rev_timestamp)',
1017                 ];
1018
1019                 $conds = [ 'rev_page' => $this->getId() ];
1020
1021                 // The user who made the top revision gets credited as "this page was last edited by
1022                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1023                 $user = $this->getUser();
1024                 if ( $user ) {
1025                         $conds[] = "rev_user != $user";
1026                 } else {
1027                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1028                 }
1029
1030                 // Username hidden?
1031                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1032
1033                 $jconds = [
1034                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1035                 ];
1036
1037                 $options = [
1038                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1039                         'ORDER BY' => 'timestamp DESC',
1040                 ];
1041
1042                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1043                 return new UserArrayFromResult( $res );
1044         }
1045
1046         /**
1047          * Should the parser cache be used?
1048          *
1049          * @param ParserOptions $parserOptions ParserOptions to check
1050          * @param int $oldId
1051          * @return bool
1052          */
1053         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1054                 return $parserOptions->getStubThreshold() == 0
1055                         && $this->exists()
1056                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1057                         && $this->getContentHandler()->isParserCacheSupported();
1058         }
1059
1060         /**
1061          * Get a ParserOutput for the given ParserOptions and revision ID.
1062          *
1063          * The parser cache will be used if possible. Cache misses that result
1064          * in parser runs are debounced with PoolCounter.
1065          *
1066          * @since 1.19
1067          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1068          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1069          *                             get the current revision (default value)
1070          * @param bool          $forceParse Force reindexing, regardless of cache settings
1071          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1072          */
1073         public function getParserOutput(
1074                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1075         ) {
1076                 $useParserCache =
1077                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1078                 wfDebug( __METHOD__ .
1079                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1080                 if ( $parserOptions->getStubThreshold() ) {
1081                         wfIncrStats( 'pcache.miss.stub' );
1082                 }
1083
1084                 if ( $useParserCache ) {
1085                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1086                         if ( $parserOutput !== false ) {
1087                                 return $parserOutput;
1088                         }
1089                 }
1090
1091                 if ( $oldid === null || $oldid === 0 ) {
1092                         $oldid = $this->getLatest();
1093                 }
1094
1095                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1096                 $pool->execute();
1097
1098                 return $pool->getParserOutput();
1099         }
1100
1101         /**
1102          * Do standard deferred updates after page view (existing or missing page)
1103          * @param User $user The relevant user
1104          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1105          */
1106         public function doViewUpdates( User $user, $oldid = 0 ) {
1107                 if ( wfReadOnly() ) {
1108                         return;
1109                 }
1110
1111                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1112                 // Update newtalk / watchlist notification status
1113                 try {
1114                         $user->clearNotification( $this->mTitle, $oldid );
1115                 } catch ( DBError $e ) {
1116                         // Avoid outage if the master is not reachable
1117                         MWExceptionHandler::logException( $e );
1118                 }
1119         }
1120
1121         /**
1122          * Perform the actions of a page purging
1123          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1124          * @return bool
1125          */
1126         public function doPurge( $flags = self::PURGE_ALL ) {
1127                 // Avoid PHP 7.1 warning of passing $this by reference
1128                 $wikiPage = $this;
1129
1130                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1131                         return false;
1132                 }
1133
1134                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1135                         // Set page_touched in the database to invalidate all DC caches
1136                         $this->mTitle->invalidateCache();
1137                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1138                         // Delete the parser options key in the local cluster to invalidate the DC cache
1139                         ParserCache::singleton()->deleteOptionsKey( $this );
1140                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1141                         $cache = ObjectCache::getLocalClusterInstance();
1142                         $cache->set(
1143                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1144                                 wfTimestamp( TS_MW ),
1145                                 $cache::TTL_HOUR
1146                         );
1147                 }
1148
1149                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1150                         // Clear any HTML file cache
1151                         HTMLFileCache::clearFileCache( $this->getTitle() );
1152                         // Send purge after any page_touched above update was committed
1153                         DeferredUpdates::addUpdate(
1154                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1155                                 DeferredUpdates::PRESEND
1156                         );
1157                 }
1158
1159                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1160                         $messageCache = MessageCache::singleton();
1161                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1162                 }
1163
1164                 return true;
1165         }
1166
1167         /**
1168          * Get the last time a user explicitly purged the page via action=purge
1169          *
1170          * @return string|bool TS_MW timestamp or false
1171          * @since 1.28
1172          */
1173         public function getLastPurgeTimestamp() {
1174                 $cache = ObjectCache::getLocalClusterInstance();
1175
1176                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1177         }
1178
1179         /**
1180          * Insert a new empty page record for this article.
1181          * This *must* be followed up by creating a revision
1182          * and running $this->updateRevisionOn( ... );
1183          * or else the record will be left in a funky state.
1184          * Best if all done inside a transaction.
1185          *
1186          * @param IDatabase $dbw
1187          * @param int|null $pageId Custom page ID that will be used for the insert statement
1188          *
1189          * @return bool|int The newly created page_id key; false if the row was not
1190          *   inserted, e.g. because the title already existed or because the specified
1191          *   page ID is already in use.
1192          */
1193         public function insertOn( $dbw, $pageId = null ) {
1194                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1195                 $dbw->insert(
1196                         'page',
1197                         [
1198                                 'page_id'           => $pageIdForInsert,
1199                                 'page_namespace'    => $this->mTitle->getNamespace(),
1200                                 'page_title'        => $this->mTitle->getDBkey(),
1201                                 'page_restrictions' => '',
1202                                 'page_is_redirect'  => 0, // Will set this shortly...
1203                                 'page_is_new'       => 1,
1204                                 'page_random'       => wfRandom(),
1205                                 'page_touched'      => $dbw->timestamp(),
1206                                 'page_latest'       => 0, // Fill this in shortly...
1207                                 'page_len'          => 0, // Fill this in shortly...
1208                         ],
1209                         __METHOD__,
1210                         'IGNORE'
1211                 );
1212
1213                 if ( $dbw->affectedRows() > 0 ) {
1214                         $newid = $pageId ?: $dbw->insertId();
1215                         $this->mId = $newid;
1216                         $this->mTitle->resetArticleID( $newid );
1217
1218                         return $newid;
1219                 } else {
1220                         return false; // nothing changed
1221                 }
1222         }
1223
1224         /**
1225          * Update the page record to point to a newly saved revision.
1226          *
1227          * @param IDatabase $dbw
1228          * @param Revision $revision For ID number, and text used to set
1229          *   length and redirect status fields
1230          * @param int $lastRevision If given, will not overwrite the page field
1231          *   when different from the currently set value.
1232          *   Giving 0 indicates the new page flag should be set on.
1233          * @param bool $lastRevIsRedirect If given, will optimize adding and
1234          *   removing rows in redirect table.
1235          * @return bool Success; false if the page row was missing or page_latest changed
1236          */
1237         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1238                 $lastRevIsRedirect = null
1239         ) {
1240                 global $wgContentHandlerUseDB;
1241
1242                 // Assertion to try to catch T92046
1243                 if ( (int)$revision->getId() === 0 ) {
1244                         throw new InvalidArgumentException(
1245                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1246                         );
1247                 }
1248
1249                 $content = $revision->getContent();
1250                 $len = $content ? $content->getSize() : 0;
1251                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1252
1253                 $conditions = [ 'page_id' => $this->getId() ];
1254
1255                 if ( !is_null( $lastRevision ) ) {
1256                         // An extra check against threads stepping on each other
1257                         $conditions['page_latest'] = $lastRevision;
1258                 }
1259
1260                 $row = [ /* SET */
1261                         'page_latest'      => $revision->getId(),
1262                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1263                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1264                         'page_is_redirect' => $rt !== null ? 1 : 0,
1265                         'page_len'         => $len,
1266                 ];
1267
1268                 if ( $wgContentHandlerUseDB ) {
1269                         $row['page_content_model'] = $revision->getContentModel();
1270                 }
1271
1272                 $dbw->update( 'page',
1273                         $row,
1274                         $conditions,
1275                         __METHOD__ );
1276
1277                 $result = $dbw->affectedRows() > 0;
1278                 if ( $result ) {
1279                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1280                         $this->setLastEdit( $revision );
1281                         $this->mLatest = $revision->getId();
1282                         $this->mIsRedirect = (bool)$rt;
1283                         // Update the LinkCache.
1284                         LinkCache::singleton()->addGoodLinkObj(
1285                                 $this->getId(),
1286                                 $this->mTitle,
1287                                 $len,
1288                                 $this->mIsRedirect,
1289                                 $this->mLatest,
1290                                 $revision->getContentModel()
1291                         );
1292                 }
1293
1294                 return $result;
1295         }
1296
1297         /**
1298          * Add row to the redirect table if this is a redirect, remove otherwise.
1299          *
1300          * @param IDatabase $dbw
1301          * @param Title $redirectTitle Title object pointing to the redirect target,
1302          *   or NULL if this is not a redirect
1303          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1304          *   removing rows in redirect table.
1305          * @return bool True on success, false on failure
1306          * @private
1307          */
1308         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1309                 // Always update redirects (target link might have changed)
1310                 // Update/Insert if we don't know if the last revision was a redirect or not
1311                 // Delete if changing from redirect to non-redirect
1312                 $isRedirect = !is_null( $redirectTitle );
1313
1314                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1315                         return true;
1316                 }
1317
1318                 if ( $isRedirect ) {
1319                         $this->insertRedirectEntry( $redirectTitle );
1320                 } else {
1321                         // This is not a redirect, remove row from redirect table
1322                         $where = [ 'rd_from' => $this->getId() ];
1323                         $dbw->delete( 'redirect', $where, __METHOD__ );
1324                 }
1325
1326                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1327                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1328                 }
1329
1330                 return ( $dbw->affectedRows() != 0 );
1331         }
1332
1333         /**
1334          * If the given revision is newer than the currently set page_latest,
1335          * update the page record. Otherwise, do nothing.
1336          *
1337          * @deprecated since 1.24, use updateRevisionOn instead
1338          *
1339          * @param IDatabase $dbw
1340          * @param Revision $revision
1341          * @return bool
1342          */
1343         public function updateIfNewerOn( $dbw, $revision ) {
1344
1345                 $row = $dbw->selectRow(
1346                         [ 'revision', 'page' ],
1347                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1348                         [
1349                                 'page_id' => $this->getId(),
1350                                 'page_latest=rev_id' ],
1351                         __METHOD__ );
1352
1353                 if ( $row ) {
1354                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1355                                 return false;
1356                         }
1357                         $prev = $row->rev_id;
1358                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1359                 } else {
1360                         // No or missing previous revision; mark the page as new
1361                         $prev = 0;
1362                         $lastRevIsRedirect = null;
1363                 }
1364
1365                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1366
1367                 return $ret;
1368         }
1369
1370         /**
1371          * Get the content that needs to be saved in order to undo all revisions
1372          * between $undo and $undoafter. Revisions must belong to the same page,
1373          * must exist and must not be deleted
1374          * @param Revision $undo
1375          * @param Revision $undoafter Must be an earlier revision than $undo
1376          * @return Content|bool Content on success, false on failure
1377          * @since 1.21
1378          * Before we had the Content object, this was done in getUndoText
1379          */
1380         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1381                 $handler = $undo->getContentHandler();
1382                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1383         }
1384
1385         /**
1386          * Returns true if this page's content model supports sections.
1387          *
1388          * @return bool
1389          *
1390          * @todo The skin should check this and not offer section functionality if
1391          *   sections are not supported.
1392          * @todo The EditPage should check this and not offer section functionality
1393          *   if sections are not supported.
1394          */
1395         public function supportsSections() {
1396                 return $this->getContentHandler()->supportsSections();
1397         }
1398
1399         /**
1400          * @param string|int|null|bool $sectionId Section identifier as a number or string
1401          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1402          * or 'new' for a new section.
1403          * @param Content $sectionContent New content of the section.
1404          * @param string $sectionTitle New section's subject, only if $section is "new".
1405          * @param string $edittime Revision timestamp or null to use the current revision.
1406          *
1407          * @throws MWException
1408          * @return Content|null New complete article content, or null if error.
1409          *
1410          * @since 1.21
1411          * @deprecated since 1.24, use replaceSectionAtRev instead
1412          */
1413         public function replaceSectionContent(
1414                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1415         ) {
1416
1417                 $baseRevId = null;
1418                 if ( $edittime && $sectionId !== 'new' ) {
1419                         $dbr = wfGetDB( DB_REPLICA );
1420                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1421                         // Try the master if this thread may have just added it.
1422                         // This could be abstracted into a Revision method, but we don't want
1423                         // to encourage loading of revisions by timestamp.
1424                         if ( !$rev
1425                                 && wfGetLB()->getServerCount() > 1
1426                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1427                         ) {
1428                                 $dbw = wfGetDB( DB_MASTER );
1429                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1430                         }
1431                         if ( $rev ) {
1432                                 $baseRevId = $rev->getId();
1433                         }
1434                 }
1435
1436                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1437         }
1438
1439         /**
1440          * @param string|int|null|bool $sectionId Section identifier as a number or string
1441          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1442          * or 'new' for a new section.
1443          * @param Content $sectionContent New content of the section.
1444          * @param string $sectionTitle New section's subject, only if $section is "new".
1445          * @param int|null $baseRevId
1446          *
1447          * @throws MWException
1448          * @return Content|null New complete article content, or null if error.
1449          *
1450          * @since 1.24
1451          */
1452         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1453                 $sectionTitle = '', $baseRevId = null
1454         ) {
1455
1456                 if ( strval( $sectionId ) === '' ) {
1457                         // Whole-page edit; let the whole text through
1458                         $newContent = $sectionContent;
1459                 } else {
1460                         if ( !$this->supportsSections() ) {
1461                                 throw new MWException( "sections not supported for content model " .
1462                                         $this->getContentHandler()->getModelID() );
1463                         }
1464
1465                         // Bug 30711: always use current version when adding a new section
1466                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1467                                 $oldContent = $this->getContent();
1468                         } else {
1469                                 $rev = Revision::newFromId( $baseRevId );
1470                                 if ( !$rev ) {
1471                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1472                                                 $this->getId() . "; section: $sectionId)\n" );
1473                                         return null;
1474                                 }
1475
1476                                 $oldContent = $rev->getContent();
1477                         }
1478
1479                         if ( !$oldContent ) {
1480                                 wfDebug( __METHOD__ . ": no page text\n" );
1481                                 return null;
1482                         }
1483
1484                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1485                 }
1486
1487                 return $newContent;
1488         }
1489
1490         /**
1491          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1492          * @param int $flags
1493          * @return int Updated $flags
1494          */
1495         public function checkFlags( $flags ) {
1496                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1497                         if ( $this->exists() ) {
1498                                 $flags |= EDIT_UPDATE;
1499                         } else {
1500                                 $flags |= EDIT_NEW;
1501                         }
1502                 }
1503
1504                 return $flags;
1505         }
1506
1507         /**
1508          * Change an existing article or create a new article. Updates RC and all necessary caches,
1509          * optionally via the deferred update array.
1510          *
1511          * @param string $text New text
1512          * @param string $summary Edit summary
1513          * @param int $flags Bitfield:
1514          *      EDIT_NEW
1515          *          Article is known or assumed to be non-existent, create a new one
1516          *      EDIT_UPDATE
1517          *          Article is known or assumed to be pre-existing, update it
1518          *      EDIT_MINOR
1519          *          Mark this edit minor, if the user is allowed to do so
1520          *      EDIT_SUPPRESS_RC
1521          *          Do not log the change in recentchanges
1522          *      EDIT_FORCE_BOT
1523          *          Mark the edit a "bot" edit regardless of user rights
1524          *      EDIT_AUTOSUMMARY
1525          *          Fill in blank summaries with generated text where possible
1526          *      EDIT_INTERNAL
1527          *          Signal that the page retrieve/save cycle happened entirely in this request.
1528          *
1529          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1530          * article will be detected. If EDIT_UPDATE is specified and the article
1531          * doesn't exist, the function will return an edit-gone-missing error. If
1532          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1533          * error will be returned. These two conditions are also possible with
1534          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1535          *
1536          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1537          *   This is not the parent revision ID, rather the revision ID for older
1538          *   content used as the source for a rollback, for example.
1539          * @param User $user The user doing the edit
1540          *
1541          * @throws MWException
1542          * @return Status Possible errors:
1543          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1544          *     set the fatal flag of $status
1545          *   edit-gone-missing: In update mode, but the article didn't exist.
1546          *   edit-conflict: In update mode, the article changed unexpectedly.
1547          *   edit-no-change: Warning that the text was the same as before.
1548          *   edit-already-exists: In creation mode, but the article already exists.
1549          *
1550          * Extensions may define additional errors.
1551          *
1552          * $return->value will contain an associative array with members as follows:
1553          *     new: Boolean indicating if the function attempted to create a new article.
1554          *     revision: The revision object for the inserted revision, or null.
1555          *
1556          * Compatibility note: this function previously returned a boolean value
1557          * indicating success/failure
1558          *
1559          * @deprecated since 1.21: use doEditContent() instead.
1560          */
1561         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1562                 wfDeprecated( __METHOD__, '1.21' );
1563
1564                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1565
1566                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1567         }
1568
1569         /**
1570          * Change an existing article or create a new article. Updates RC and all necessary caches,
1571          * optionally via the deferred update array.
1572          *
1573          * @param Content $content New content
1574          * @param string $summary Edit summary
1575          * @param int $flags Bitfield:
1576          *      EDIT_NEW
1577          *          Article is known or assumed to be non-existent, create a new one
1578          *      EDIT_UPDATE
1579          *          Article is known or assumed to be pre-existing, update it
1580          *      EDIT_MINOR
1581          *          Mark this edit minor, if the user is allowed to do so
1582          *      EDIT_SUPPRESS_RC
1583          *          Do not log the change in recentchanges
1584          *      EDIT_FORCE_BOT
1585          *          Mark the edit a "bot" edit regardless of user rights
1586          *      EDIT_AUTOSUMMARY
1587          *          Fill in blank summaries with generated text where possible
1588          *      EDIT_INTERNAL
1589          *          Signal that the page retrieve/save cycle happened entirely in this request.
1590          *
1591          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1592          * article will be detected. If EDIT_UPDATE is specified and the article
1593          * doesn't exist, the function will return an edit-gone-missing error. If
1594          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1595          * error will be returned. These two conditions are also possible with
1596          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1597          *
1598          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1599          *   This is not the parent revision ID, rather the revision ID for older
1600          *   content used as the source for a rollback, for example.
1601          * @param User $user The user doing the edit
1602          * @param string $serialFormat Format for storing the content in the
1603          *   database.
1604          * @param array|null $tags Change tags to apply to this edit
1605          * Callers are responsible for permission checks
1606          * (with ChangeTags::canAddTagsAccompanyingChange)
1607          * @param Int $undidRevId Id of revision that was undone or 0
1608          *
1609          * @throws MWException
1610          * @return Status Possible errors:
1611          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1612          *       set the fatal flag of $status.
1613          *     edit-gone-missing: In update mode, but the article didn't exist.
1614          *     edit-conflict: In update mode, the article changed unexpectedly.
1615          *     edit-no-change: Warning that the text was the same as before.
1616          *     edit-already-exists: In creation mode, but the article already exists.
1617          *
1618          *  Extensions may define additional errors.
1619          *
1620          *  $return->value will contain an associative array with members as follows:
1621          *     new: Boolean indicating if the function attempted to create a new article.
1622          *     revision: The revision object for the inserted revision, or null.
1623          *
1624          * @since 1.21
1625          * @throws MWException
1626          */
1627         public function doEditContent(
1628                 Content $content, $summary, $flags = 0, $baseRevId = false,
1629                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1630         ) {
1631                 global $wgUser, $wgUseAutomaticEditSummaries;
1632
1633                 // Old default parameter for $tags was null
1634                 if ( $tags === null ) {
1635                         $tags = [];
1636                 }
1637
1638                 // Low-level sanity check
1639                 if ( $this->mTitle->getText() === '' ) {
1640                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1641                 }
1642                 // Make sure the given content type is allowed for this page
1643                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1644                         return Status::newFatal( 'content-not-allowed-here',
1645                                 ContentHandler::getLocalizedName( $content->getModel() ),
1646                                 $this->mTitle->getPrefixedText()
1647                         );
1648                 }
1649
1650                 // Load the data from the master database if needed.
1651                 // The caller may already loaded it from the master or even loaded it using
1652                 // SELECT FOR UPDATE, so do not override that using clear().
1653                 $this->loadPageData( 'fromdbmaster' );
1654
1655                 $user = $user ?: $wgUser;
1656                 $flags = $this->checkFlags( $flags );
1657
1658                 // Avoid PHP 7.1 warning of passing $this by reference
1659                 $wikiPage = $this;
1660
1661                 // Trigger pre-save hook (using provided edit summary)
1662                 $hookStatus = Status::newGood( [] );
1663                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1664                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1665                 // Check if the hook rejected the attempted save
1666                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1667                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args, '1.21' )
1668                 ) {
1669                         if ( $hookStatus->isOK() ) {
1670                                 // Hook returned false but didn't call fatal(); use generic message
1671                                 $hookStatus->fatal( 'edit-hook-aborted' );
1672                         }
1673
1674                         return $hookStatus;
1675                 }
1676
1677                 $old_revision = $this->getRevision(); // current revision
1678                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1679
1680                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1681                         $tags[] = 'mw-contentmodelchange';
1682                 }
1683
1684                 // Provide autosummaries if one is not provided and autosummaries are enabled
1685                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1686                         $handler = $content->getContentHandler();
1687                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1688                 }
1689
1690                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1691                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1692                         $useCache = false;
1693                 } else {
1694                         $useCache = true;
1695                 }
1696
1697                 // Get the pre-save transform content and final parser output
1698                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1699                 $pstContent = $editInfo->pstContent; // Content object
1700                 $meta = [
1701                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1702                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1703                         'serialized' => $editInfo->pst,
1704                         'serialFormat' => $serialFormat,
1705                         'baseRevId' => $baseRevId,
1706                         'oldRevision' => $old_revision,
1707                         'oldContent' => $old_content,
1708                         'oldId' => $this->getLatest(),
1709                         'oldIsRedirect' => $this->isRedirect(),
1710                         'oldCountable' => $this->isCountable(),
1711                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1712                         'undidRevId' => $undidRevId
1713                 ];
1714
1715                 // Actually create the revision and create/update the page
1716                 if ( $flags & EDIT_UPDATE ) {
1717                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1718                 } else {
1719                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1720                 }
1721
1722                 // Promote user to any groups they meet the criteria for
1723                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1724                         $user->addAutopromoteOnceGroups( 'onEdit' );
1725                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1726                 } );
1727
1728                 return $status;
1729         }
1730
1731         /**
1732          * @param Content $content Pre-save transform content
1733          * @param integer $flags
1734          * @param User $user
1735          * @param string $summary
1736          * @param array $meta
1737          * @return Status
1738          * @throws DBUnexpectedError
1739          * @throws Exception
1740          * @throws FatalError
1741          * @throws MWException
1742          */
1743         private function doModify(
1744                 Content $content, $flags, User $user, $summary, array $meta
1745         ) {
1746                 global $wgUseRCPatrol;
1747
1748                 // Update article, but only if changed.
1749                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1750
1751                 // Convenience variables
1752                 $now = wfTimestampNow();
1753                 $oldid = $meta['oldId'];
1754                 /** @var $oldContent Content|null */
1755                 $oldContent = $meta['oldContent'];
1756                 $newsize = $content->getSize();
1757
1758                 if ( !$oldid ) {
1759                         // Article gone missing
1760                         $status->fatal( 'edit-gone-missing' );
1761
1762                         return $status;
1763                 } elseif ( !$oldContent ) {
1764                         // Sanity check for bug 37225
1765                         throw new MWException( "Could not find text for current revision {$oldid}." );
1766                 }
1767
1768                 // @TODO: pass content object?!
1769                 $revision = new Revision( [
1770                         'page'       => $this->getId(),
1771                         'title'      => $this->mTitle, // for determining the default content model
1772                         'comment'    => $summary,
1773                         'minor_edit' => $meta['minor'],
1774                         'text'       => $meta['serialized'],
1775                         'len'        => $newsize,
1776                         'parent_id'  => $oldid,
1777                         'user'       => $user->getId(),
1778                         'user_text'  => $user->getName(),
1779                         'timestamp'  => $now,
1780                         'content_model' => $content->getModel(),
1781                         'content_format' => $meta['serialFormat'],
1782                 ] );
1783
1784                 $changed = !$content->equals( $oldContent );
1785
1786                 $dbw = wfGetDB( DB_MASTER );
1787
1788                 if ( $changed ) {
1789                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1790                         $status->merge( $prepStatus );
1791                         if ( !$status->isOK() ) {
1792                                 return $status;
1793                         }
1794
1795                         $dbw->startAtomic( __METHOD__ );
1796                         // Get the latest page_latest value while locking it.
1797                         // Do a CAS style check to see if it's the same as when this method
1798                         // started. If it changed then bail out before touching the DB.
1799                         $latestNow = $this->lockAndGetLatest();
1800                         if ( $latestNow != $oldid ) {
1801                                 $dbw->endAtomic( __METHOD__ );
1802                                 // Page updated or deleted in the mean time
1803                                 $status->fatal( 'edit-conflict' );
1804
1805                                 return $status;
1806                         }
1807
1808                         // At this point we are now comitted to returning an OK
1809                         // status unless some DB query error or other exception comes up.
1810                         // This way callers don't have to call rollback() if $status is bad
1811                         // unless they actually try to catch exceptions (which is rare).
1812
1813                         // Save the revision text
1814                         $revisionId = $revision->insertOn( $dbw );
1815                         // Update page_latest and friends to reflect the new revision
1816                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1817                                 throw new MWException( "Failed to update page row to use new revision." );
1818                         }
1819
1820                         Hooks::run( 'NewRevisionFromEditComplete',
1821                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1822
1823                         // Update recentchanges
1824                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1825                                 // Mark as patrolled if the user can do so
1826                                 $patrolled = $wgUseRCPatrol && !count(
1827                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1828                                 // Add RC row to the DB
1829                                 RecentChange::notifyEdit(
1830                                         $now,
1831                                         $this->mTitle,
1832                                         $revision->isMinor(),
1833                                         $user,
1834                                         $summary,
1835                                         $oldid,
1836                                         $this->getTimestamp(),
1837                                         $meta['bot'],
1838                                         '',
1839                                         $oldContent ? $oldContent->getSize() : 0,
1840                                         $newsize,
1841                                         $revisionId,
1842                                         $patrolled,
1843                                         $meta['tags']
1844                                 );
1845                         }
1846
1847                         $user->incEditCount();
1848
1849                         $dbw->endAtomic( __METHOD__ );
1850                         $this->mTimestamp = $now;
1851                 } else {
1852                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1853                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1854                         $revision->setId( $this->getLatest() );
1855                         $revision->setUserIdAndName(
1856                                 $this->getUser( Revision::RAW ),
1857                                 $this->getUserText( Revision::RAW )
1858                         );
1859                 }
1860
1861                 if ( $changed ) {
1862                         // Return the new revision to the caller
1863                         $status->value['revision'] = $revision;
1864                 } else {
1865                         $status->warning( 'edit-no-change' );
1866                         // Update page_touched as updateRevisionOn() was not called.
1867                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1868                         $this->mTitle->invalidateCache( $now );
1869                 }
1870
1871                 // Do secondary updates once the main changes have been committed...
1872                 DeferredUpdates::addUpdate(
1873                         new AtomicSectionUpdate(
1874                                 $dbw,
1875                                 __METHOD__,
1876                                 function () use (
1877                                         $revision, &$user, $content, $summary, &$flags,
1878                                         $changed, $meta, &$status
1879                                 ) {
1880                                         // Update links tables, site stats, etc.
1881                                         $this->doEditUpdates(
1882                                                 $revision,
1883                                                 $user,
1884                                                 [
1885                                                         'changed' => $changed,
1886                                                         'oldcountable' => $meta['oldCountable'],
1887                                                         'oldrevision' => $meta['oldRevision']
1888                                                 ]
1889                                         );
1890                                         // Avoid PHP 7.1 warning of passing $this by reference
1891                                         $wikiPage = $this;
1892                                         // Trigger post-save hook
1893                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1894                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1895                                                 $meta['undidRevId'] ];
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                                         // Avoid PHP 7.1 warning of passing $this by reference
2014                                         $wikiPage = $this;
2015                                         // Trigger post-create hook
2016                                         $params = [ &$wikiPage, &$user, $content, $summary,
2017                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2018                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params, '1.21' );
2019                                         Hooks::run( 'PageContentInsertComplete', $params );
2020                                         // Trigger post-save hook
2021                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2022                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params, '1.21' );
2023                                         Hooks::run( 'PageContentSaveComplete', $params );
2024
2025                                 }
2026                         ),
2027                         DeferredUpdates::PRESEND
2028                 );
2029
2030                 return $status;
2031         }
2032
2033         /**
2034          * Get parser options suitable for rendering the primary article wikitext
2035          *
2036          * @see ContentHandler::makeParserOptions
2037          *
2038          * @param IContextSource|User|string $context One of the following:
2039          *        - IContextSource: Use the User and the Language of the provided
2040          *          context
2041          *        - User: Use the provided User object and $wgLang for the language,
2042          *          so use an IContextSource object if possible.
2043          *        - 'canonical': Canonical options (anonymous user with default
2044          *          preferences and content language).
2045          * @return ParserOptions
2046          */
2047         public function makeParserOptions( $context ) {
2048                 $options = $this->getContentHandler()->makeParserOptions( $context );
2049
2050                 if ( $this->getTitle()->isConversionTable() ) {
2051                         // @todo ConversionTable should become a separate content model, so
2052                         // we don't need special cases like this one.
2053                         $options->disableContentConversion();
2054                 }
2055
2056                 return $options;
2057         }
2058
2059         /**
2060          * Prepare content which is about to be saved.
2061          * Returns a stdClass with source, pst and output members
2062          *
2063          * @param Content $content
2064          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2065          *        revision ID is also accepted, but this is deprecated.
2066          * @param User|null $user
2067          * @param string|null $serialFormat
2068          * @param bool $useCache Check shared prepared edit cache
2069          *
2070          * @return object
2071          *
2072          * @since 1.21
2073          */
2074         public function prepareContentForEdit(
2075                 Content $content, $revision = null, User $user = null,
2076                 $serialFormat = null, $useCache = true
2077         ) {
2078                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2079
2080                 if ( is_object( $revision ) ) {
2081                         $revid = $revision->getId();
2082                 } else {
2083                         $revid = $revision;
2084                         // This code path is deprecated, and nothing is known to
2085                         // use it, so performance here shouldn't be a worry.
2086                         if ( $revid !== null ) {
2087                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2088                         } else {
2089                                 $revision = null;
2090                         }
2091                 }
2092
2093                 $user = is_null( $user ) ? $wgUser : $user;
2094                 // XXX: check $user->getId() here???
2095
2096                 // Use a sane default for $serialFormat, see bug 57026
2097                 if ( $serialFormat === null ) {
2098                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2099                 }
2100
2101                 if ( $this->mPreparedEdit
2102                         && isset( $this->mPreparedEdit->newContent )
2103                         && $this->mPreparedEdit->newContent->equals( $content )
2104                         && $this->mPreparedEdit->revid == $revid
2105                         && $this->mPreparedEdit->format == $serialFormat
2106                         // XXX: also check $user here?
2107                 ) {
2108                         // Already prepared
2109                         return $this->mPreparedEdit;
2110                 }
2111
2112                 // The edit may have already been prepared via api.php?action=stashedit
2113                 $cachedEdit = $useCache && $wgAjaxEditStash
2114                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2115                         : false;
2116
2117                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2118                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2119
2120                 $edit = (object)[];
2121                 if ( $cachedEdit ) {
2122                         $edit->timestamp = $cachedEdit->timestamp;
2123                 } else {
2124                         $edit->timestamp = wfTimestampNow();
2125                 }
2126                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2127                 $edit->revid = $revid;
2128
2129                 if ( $cachedEdit ) {
2130                         $edit->pstContent = $cachedEdit->pstContent;
2131                 } else {
2132                         $edit->pstContent = $content
2133                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2134                                 : null;
2135                 }
2136
2137                 $edit->format = $serialFormat;
2138                 $edit->popts = $this->makeParserOptions( 'canonical' );
2139                 if ( $cachedEdit ) {
2140                         $edit->output = $cachedEdit->output;
2141                 } else {
2142                         if ( $revision ) {
2143                                 // We get here if vary-revision is set. This means that this page references
2144                                 // itself (such as via self-transclusion). In this case, we need to make sure
2145                                 // that any such self-references refer to the newly-saved revision, and not
2146                                 // to the previous one, which could otherwise happen due to replica DB lag.
2147                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2148                                 $edit->popts->setCurrentRevisionCallback(
2149                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2150                                                 if ( $title->equals( $revision->getTitle() ) ) {
2151                                                         return $revision;
2152                                                 } else {
2153                                                         return call_user_func( $oldCallback, $title, $parser );
2154                                                 }
2155                                         }
2156                                 );
2157                         } else {
2158                                 // Try to avoid a second parse if {{REVISIONID}} is used
2159                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2160                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2161                                                 'revision',
2162                                                 'MAX(rev_id)',
2163                                                 [],
2164                                                 __METHOD__
2165                                         );
2166                                 } );
2167                         }
2168                         $edit->output = $edit->pstContent
2169                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2170                                 : null;
2171                 }
2172
2173                 $edit->newContent = $content;
2174                 $edit->oldContent = $this->getContent( Revision::RAW );
2175
2176                 // NOTE: B/C for hooks! don't use these fields!
2177                 $edit->newText = $edit->newContent
2178                         ? ContentHandler::getContentText( $edit->newContent )
2179                         : '';
2180                 $edit->oldText = $edit->oldContent
2181                         ? ContentHandler::getContentText( $edit->oldContent )
2182                         : '';
2183                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2184
2185                 if ( $edit->output ) {
2186                         $edit->output->setCacheTime( wfTimestampNow() );
2187                 }
2188
2189                 // Process cache the result
2190                 $this->mPreparedEdit = $edit;
2191
2192                 return $edit;
2193         }
2194
2195         /**
2196          * Do standard deferred updates after page edit.
2197          * Update links tables, site stats, search index and message cache.
2198          * Purges pages that include this page if the text was changed here.
2199          * Every 100th edit, prune the recent changes table.
2200          *
2201          * @param Revision $revision
2202          * @param User $user User object that did the revision
2203          * @param array $options Array of options, following indexes are used:
2204          * - changed: boolean, whether the revision changed the content (default true)
2205          * - created: boolean, whether the revision created the page (default false)
2206          * - moved: boolean, whether the page was moved (default false)
2207          * - restored: boolean, whether the page was undeleted (default false)
2208          * - oldrevision: Revision object for the pre-update revision (default null)
2209          * - oldcountable: boolean, null, or string 'no-change' (default null):
2210          *   - boolean: whether the page was counted as an article before that
2211          *     revision, only used in changed is true and created is false
2212          *   - null: if created is false, don't update the article count; if created
2213          *     is true, do update the article count
2214          *   - 'no-change': don't update the article count, ever
2215          */
2216         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2217                 global $wgRCWatchCategoryMembership;
2218
2219                 $options += [
2220                         'changed' => true,
2221                         'created' => false,
2222                         'moved' => false,
2223                         'restored' => false,
2224                         'oldrevision' => null,
2225                         'oldcountable' => null
2226                 ];
2227                 $content = $revision->getContent();
2228
2229                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2230
2231                 // See if the parser output before $revision was inserted is still valid
2232                 $editInfo = false;
2233                 if ( !$this->mPreparedEdit ) {
2234                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2235                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2236                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2237                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2238                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2239                 ) {
2240                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2241                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2242                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2243                 } else {
2244                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2245                         $editInfo = $this->mPreparedEdit;
2246                 }
2247
2248                 if ( !$editInfo ) {
2249                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2250                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2251                         // as any prepared content from there or in doEditContent() was already rejected.
2252                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2253                 }
2254
2255                 // Save it to the parser cache.
2256                 // Make sure the cache time matches page_touched to avoid double parsing.
2257                 ParserCache::singleton()->save(
2258                         $editInfo->output, $this, $editInfo->popts,
2259                         $revision->getTimestamp(), $editInfo->revid
2260                 );
2261
2262                 // Update the links tables and other secondary data
2263                 if ( $content ) {
2264                         $recursive = $options['changed']; // bug 50785
2265                         $updates = $content->getSecondaryDataUpdates(
2266                                 $this->getTitle(), null, $recursive, $editInfo->output
2267                         );
2268                         foreach ( $updates as $update ) {
2269                                 if ( $update instanceof LinksUpdate ) {
2270                                         $update->setRevision( $revision );
2271                                         $update->setTriggeringUser( $user );
2272                                 }
2273                                 DeferredUpdates::addUpdate( $update );
2274                         }
2275                         if ( $wgRCWatchCategoryMembership
2276                                 && $this->getContentHandler()->supportsCategories() === true
2277                                 && ( $options['changed'] || $options['created'] )
2278                                 && !$options['restored']
2279                         ) {
2280                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2281                                 // the recent change entry (also done via deferred updates) and carry over any
2282                                 // bot/deletion/IP flags, ect.
2283                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2284                                         $this->getTitle(),
2285                                         [
2286                                                 'pageId' => $this->getId(),
2287                                                 'revTimestamp' => $revision->getTimestamp()
2288                                         ]
2289                                 ) );
2290                         }
2291                 }
2292
2293                 // Avoid PHP 7.1 warning of passing $this by reference
2294                 $wikiPage = $this;
2295
2296                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2297
2298                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2299                         // Flush old entries from the `recentchanges` table
2300                         if ( mt_rand( 0, 9 ) == 0 ) {
2301                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2302                         }
2303                 }
2304
2305                 if ( !$this->exists() ) {
2306                         return;
2307                 }
2308
2309                 $id = $this->getId();
2310                 $title = $this->mTitle->getPrefixedDBkey();
2311                 $shortTitle = $this->mTitle->getDBkey();
2312
2313                 if ( $options['oldcountable'] === 'no-change' ||
2314                         ( !$options['changed'] && !$options['moved'] )
2315                 ) {
2316                         $good = 0;
2317                 } elseif ( $options['created'] ) {
2318                         $good = (int)$this->isCountable( $editInfo );
2319                 } elseif ( $options['oldcountable'] !== null ) {
2320                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2321                 } else {
2322                         $good = 0;
2323                 }
2324                 $edits = $options['changed'] ? 1 : 0;
2325                 $total = $options['created'] ? 1 : 0;
2326
2327                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2328                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2329
2330                 // If this is another user's talk page, update newtalk.
2331                 // Don't do this if $options['changed'] = false (null-edits) nor if
2332                 // it's a minor edit and the user doesn't want notifications for those.
2333                 if ( $options['changed']
2334                         && $this->mTitle->getNamespace() == NS_USER_TALK
2335                         && $shortTitle != $user->getTitleKey()
2336                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2337                 ) {
2338                         $recipient = User::newFromName( $shortTitle, false );
2339                         if ( !$recipient ) {
2340                                 wfDebug( __METHOD__ . ": invalid username\n" );
2341                         } else {
2342                                 // Avoid PHP 7.1 warning of passing $this by reference
2343                                 $wikiPage = $this;
2344
2345                                 // Allow extensions to prevent user notification
2346                                 // when a new message is added to their talk page
2347                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2348                                         if ( User::isIP( $shortTitle ) ) {
2349                                                 // An anonymous user
2350                                                 $recipient->setNewtalk( true, $revision );
2351                                         } elseif ( $recipient->isLoggedIn() ) {
2352                                                 $recipient->setNewtalk( true, $revision );
2353                                         } else {
2354                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2355                                         }
2356                                 }
2357                         }
2358                 }
2359
2360                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2361                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2362                 }
2363
2364                 if ( $options['created'] ) {
2365                         self::onArticleCreate( $this->mTitle );
2366                 } elseif ( $options['changed'] ) { // bug 50785
2367                         self::onArticleEdit( $this->mTitle, $revision );
2368                 }
2369
2370                 ResourceLoaderWikiModule::invalidateModuleCache(
2371                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2372                 );
2373         }
2374
2375         /**
2376          * Update the article's restriction field, and leave a log entry.
2377          * This works for protection both existing and non-existing pages.
2378          *
2379          * @param array $limit Set of restriction keys
2380          * @param array $expiry Per restriction type expiration
2381          * @param int &$cascade Set to false if cascading protection isn't allowed.
2382          * @param string $reason
2383          * @param User $user The user updating the restrictions
2384          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2385          *   ($user should be able to add the specified tags before this is called)
2386          * @return Status Status object; if action is taken, $status->value is the log_id of the
2387          *   protection log entry.
2388          */
2389         public function doUpdateRestrictions( array $limit, array $expiry,
2390                 &$cascade, $reason, User $user, $tags = null
2391         ) {
2392                 global $wgCascadingRestrictionLevels, $wgContLang;
2393
2394                 if ( wfReadOnly() ) {
2395                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2396                 }
2397
2398                 $this->loadPageData( 'fromdbmaster' );
2399                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2400                 $id = $this->getId();
2401
2402                 if ( !$cascade ) {
2403                         $cascade = false;
2404                 }
2405
2406                 // Take this opportunity to purge out expired restrictions
2407                 Title::purgeExpiredRestrictions();
2408
2409                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2410                 // we expect a single selection, but the schema allows otherwise.
2411                 $isProtected = false;
2412                 $protect = false;
2413                 $changed = false;
2414
2415                 $dbw = wfGetDB( DB_MASTER );
2416
2417                 foreach ( $restrictionTypes as $action ) {
2418                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2419                                 $expiry[$action] = 'infinity';
2420                         }
2421                         if ( !isset( $limit[$action] ) ) {
2422                                 $limit[$action] = '';
2423                         } elseif ( $limit[$action] != '' ) {
2424                                 $protect = true;
2425                         }
2426
2427                         // Get current restrictions on $action
2428                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2429                         if ( $current != '' ) {
2430                                 $isProtected = true;
2431                         }
2432
2433                         if ( $limit[$action] != $current ) {
2434                                 $changed = true;
2435                         } elseif ( $limit[$action] != '' ) {
2436                                 // Only check expiry change if the action is actually being
2437                                 // protected, since expiry does nothing on an not-protected
2438                                 // action.
2439                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2440                                         $changed = true;
2441                                 }
2442                         }
2443                 }
2444
2445                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2446                         $changed = true;
2447                 }
2448
2449                 // If nothing has changed, do nothing
2450                 if ( !$changed ) {
2451                         return Status::newGood();
2452                 }
2453
2454                 if ( !$protect ) { // No protection at all means unprotection
2455                         $revCommentMsg = 'unprotectedarticle-comment';
2456                         $logAction = 'unprotect';
2457                 } elseif ( $isProtected ) {
2458                         $revCommentMsg = 'modifiedarticleprotection-comment';
2459                         $logAction = 'modify';
2460                 } else {
2461                         $revCommentMsg = 'protectedarticle-comment';
2462                         $logAction = 'protect';
2463                 }
2464
2465                 // Truncate for whole multibyte characters
2466                 $reason = $wgContLang->truncate( $reason, 255 );
2467
2468                 $logRelationsValues = [];
2469                 $logRelationsField = null;
2470                 $logParamsDetails = [];
2471
2472                 // Null revision (used for change tag insertion)
2473                 $nullRevision = null;
2474
2475                 if ( $id ) { // Protection of existing page
2476                         // Avoid PHP 7.1 warning of passing $this by reference
2477                         $wikiPage = $this;
2478
2479                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2480                                 return Status::newGood();
2481                         }
2482
2483                         // Only certain restrictions can cascade...
2484                         $editrestriction = isset( $limit['edit'] )
2485                                 ? [ $limit['edit'] ]
2486                                 : $this->mTitle->getRestrictions( 'edit' );
2487                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2488                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2489                         }
2490                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2491                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2492                         }
2493
2494                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2495                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2496                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2497                         }
2498                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2499                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2500                         }
2501
2502                         // The schema allows multiple restrictions
2503                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2504                                 $cascade = false;
2505                         }
2506
2507                         // insert null revision to identify the page protection change as edit summary
2508                         $latest = $this->getLatest();
2509                         $nullRevision = $this->insertProtectNullRevision(
2510                                 $revCommentMsg,
2511                                 $limit,
2512                                 $expiry,
2513                                 $cascade,
2514                                 $reason,
2515                                 $user
2516                         );
2517
2518                         if ( $nullRevision === null ) {
2519                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2520                         }
2521
2522                         $logRelationsField = 'pr_id';
2523
2524                         // Update restrictions table
2525                         foreach ( $limit as $action => $restrictions ) {
2526                                 $dbw->delete(
2527                                         'page_restrictions',
2528                                         [
2529                                                 'pr_page' => $id,
2530                                                 'pr_type' => $action
2531                                         ],
2532                                         __METHOD__
2533                                 );
2534                                 if ( $restrictions != '' ) {
2535                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2536                                         $dbw->insert(
2537                                                 'page_restrictions',
2538                                                 [
2539                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2540                                                         'pr_page' => $id,
2541                                                         'pr_type' => $action,
2542                                                         'pr_level' => $restrictions,
2543                                                         'pr_cascade' => $cascadeValue,
2544                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2545                                                 ],
2546                                                 __METHOD__
2547                                         );
2548                                         $logRelationsValues[] = $dbw->insertId();
2549                                         $logParamsDetails[] = [
2550                                                 'type' => $action,
2551                                                 'level' => $restrictions,
2552                                                 'expiry' => $expiry[$action],
2553                                                 'cascade' => (bool)$cascadeValue,
2554                                         ];
2555                                 }
2556                         }
2557
2558                         // Clear out legacy restriction fields
2559                         $dbw->update(
2560                                 'page',
2561                                 [ 'page_restrictions' => '' ],
2562                                 [ 'page_id' => $id ],
2563                                 __METHOD__
2564                         );
2565
2566                         // Avoid PHP 7.1 warning of passing $this by reference
2567                         $wikiPage = $this;
2568
2569                         Hooks::run( 'NewRevisionFromEditComplete',
2570                                 [ $this, $nullRevision, $latest, $user ] );
2571                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2572                 } else { // Protection of non-existing page (also known as "title protection")
2573                         // Cascade protection is meaningless in this case
2574                         $cascade = false;
2575
2576                         if ( $limit['create'] != '' ) {
2577                                 $dbw->replace( 'protected_titles',
2578                                         [ [ 'pt_namespace', 'pt_title' ] ],
2579                                         [
2580                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2581                                                 'pt_title' => $this->mTitle->getDBkey(),
2582                                                 'pt_create_perm' => $limit['create'],
2583                                                 'pt_timestamp' => $dbw->timestamp(),
2584                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2585                                                 'pt_user' => $user->getId(),
2586                                                 'pt_reason' => $reason,
2587                                         ], __METHOD__
2588                                 );
2589                                 $logParamsDetails[] = [
2590                                         'type' => 'create',
2591                                         'level' => $limit['create'],
2592                                         'expiry' => $expiry['create'],
2593                                 ];
2594                         } else {
2595                                 $dbw->delete( 'protected_titles',
2596                                         [
2597                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2598                                                 'pt_title' => $this->mTitle->getDBkey()
2599                                         ], __METHOD__
2600                                 );
2601                         }
2602                 }
2603
2604                 $this->mTitle->flushRestrictions();
2605                 InfoAction::invalidateCache( $this->mTitle );
2606
2607                 if ( $logAction == 'unprotect' ) {
2608                         $params = [];
2609                 } else {
2610                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2611                         $params = [
2612                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2613                                 '5:bool:cascade' => $cascade,
2614                                 'details' => $logParamsDetails, // parameter for localize and api
2615                         ];
2616                 }
2617
2618                 // Update the protection log
2619                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2620                 $logEntry->setTarget( $this->mTitle );
2621                 $logEntry->setComment( $reason );
2622                 $logEntry->setPerformer( $user );
2623                 $logEntry->setParameters( $params );
2624                 if ( !is_null( $nullRevision ) ) {
2625                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2626                 }
2627                 $logEntry->setTags( $tags );
2628                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2629                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2630                 }
2631                 $logId = $logEntry->insert();
2632                 $logEntry->publish( $logId );
2633
2634                 return Status::newGood( $logId );
2635         }
2636
2637         /**
2638          * Insert a new null revision for this page.
2639          *
2640          * @param string $revCommentMsg Comment message key for the revision
2641          * @param array $limit Set of restriction keys
2642          * @param array $expiry Per restriction type expiration
2643          * @param int $cascade Set to false if cascading protection isn't allowed.
2644          * @param string $reason
2645          * @param User|null $user
2646          * @return Revision|null Null on error
2647          */
2648         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2649                 array $expiry, $cascade, $reason, $user = null
2650         ) {
2651                 $dbw = wfGetDB( DB_MASTER );
2652
2653                 // Prepare a null revision to be added to the history
2654                 $editComment = wfMessage(
2655                         $revCommentMsg,
2656                         $this->mTitle->getPrefixedText(),
2657                         $user ? $user->getName() : ''
2658                 )->inContentLanguage()->text();
2659                 if ( $reason ) {
2660                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2661                 }
2662                 $protectDescription = $this->protectDescription( $limit, $expiry );
2663                 if ( $protectDescription ) {
2664                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2665                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2666                                 ->inContentLanguage()->text();
2667                 }
2668                 if ( $cascade ) {
2669                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2670                         $editComment .= wfMessage( 'brackets' )->params(
2671                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2672                         )->inContentLanguage()->text();
2673                 }
2674
2675                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2676                 if ( $nullRev ) {
2677                         $nullRev->insertOn( $dbw );
2678
2679                         // Update page record and touch page
2680                         $oldLatest = $nullRev->getParentId();
2681                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2682                 }
2683
2684                 return $nullRev;
2685         }
2686
2687         /**
2688          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2689          * @return string
2690          */
2691         protected function formatExpiry( $expiry ) {
2692                 global $wgContLang;
2693
2694                 if ( $expiry != 'infinity' ) {
2695                         return wfMessage(
2696                                 'protect-expiring',
2697                                 $wgContLang->timeanddate( $expiry, false, false ),
2698                                 $wgContLang->date( $expiry, false, false ),
2699                                 $wgContLang->time( $expiry, false, false )
2700                         )->inContentLanguage()->text();
2701                 } else {
2702                         return wfMessage( 'protect-expiry-indefinite' )
2703                                 ->inContentLanguage()->text();
2704                 }
2705         }
2706
2707         /**
2708          * Builds the description to serve as comment for the edit.
2709          *
2710          * @param array $limit Set of restriction keys
2711          * @param array $expiry Per restriction type expiration
2712          * @return string
2713          */
2714         public function protectDescription( array $limit, array $expiry ) {
2715                 $protectDescription = '';
2716
2717                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2718                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2719                         # All possible message keys are listed here for easier grepping:
2720                         # * restriction-create
2721                         # * restriction-edit
2722                         # * restriction-move
2723                         # * restriction-upload
2724                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2725                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2726                         # with '' filtered out. All possible message keys are listed below:
2727                         # * protect-level-autoconfirmed
2728                         # * protect-level-sysop
2729                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2730                                 ->inContentLanguage()->text();
2731
2732                         $expiryText = $this->formatExpiry( $expiry[$action] );
2733
2734                         if ( $protectDescription !== '' ) {
2735                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2736                         }
2737                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2738                                 ->params( $actionText, $restrictionsText, $expiryText )
2739                                 ->inContentLanguage()->text();
2740                 }
2741
2742                 return $protectDescription;
2743         }
2744
2745         /**
2746          * Builds the description to serve as comment for the log entry.
2747          *
2748          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2749          * protect description text. Keep them in old format to avoid breaking compatibility.
2750          * TODO: Fix protection log to store structured description and format it on-the-fly.
2751          *
2752          * @param array $limit Set of restriction keys
2753          * @param array $expiry Per restriction type expiration
2754          * @return string
2755          */
2756         public function protectDescriptionLog( array $limit, array $expiry ) {
2757                 global $wgContLang;
2758
2759                 $protectDescriptionLog = '';
2760
2761                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2762                         $expiryText = $this->formatExpiry( $expiry[$action] );
2763                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2764                                 "[$action=$restrictions] ($expiryText)";
2765                 }
2766
2767                 return trim( $protectDescriptionLog );
2768         }
2769
2770         /**
2771          * Take an array of page restrictions and flatten it to a string
2772          * suitable for insertion into the page_restrictions field.
2773          *
2774          * @param string[] $limit
2775          *
2776          * @throws MWException
2777          * @return string
2778          */
2779         protected static function flattenRestrictions( $limit ) {
2780                 if ( !is_array( $limit ) ) {
2781                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2782                 }
2783
2784                 $bits = [];
2785                 ksort( $limit );
2786
2787                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2788                         $bits[] = "$action=$restrictions";
2789                 }
2790
2791                 return implode( ':', $bits );
2792         }
2793
2794         /**
2795          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2796          * backwards compatibility, if you care about error reporting you should use
2797          * doDeleteArticleReal() instead.
2798          *
2799          * Deletes the article with database consistency, writes logs, purges caches
2800          *
2801          * @param string $reason Delete reason for deletion log
2802          * @param bool $suppress Suppress all revisions and log the deletion in
2803          *        the suppression log instead of the deletion log
2804          * @param int $u1 Unused
2805          * @param bool $u2 Unused
2806          * @param array|string &$error Array of errors to append to
2807          * @param User $user The deleting user
2808          * @return bool True if successful
2809          */
2810         public function doDeleteArticle(
2811                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2812         ) {
2813                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2814                 return $status->isGood();
2815         }
2816
2817         /**
2818          * Back-end article deletion
2819          * Deletes the article with database consistency, writes logs, purges caches
2820          *
2821          * @since 1.19
2822          *
2823          * @param string $reason Delete reason for deletion log
2824          * @param bool $suppress Suppress all revisions and log the deletion in
2825          *   the suppression log instead of the deletion log
2826          * @param int $u1 Unused
2827          * @param bool $u2 Unused
2828          * @param array|string &$error Array of errors to append to
2829          * @param User $user The deleting user
2830          * @param array $tags Tags to apply to the deletion action
2831          * @return Status Status object; if successful, $status->value is the log_id of the
2832          *   deletion log entry. If the page couldn't be deleted because it wasn't
2833          *   found, $status is a non-fatal 'cannotdelete' error
2834          */
2835         public function doDeleteArticleReal(
2836                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2837                 $tags = [], $logsubtype = 'delete'
2838         ) {
2839                 global $wgUser, $wgContentHandlerUseDB;
2840
2841                 wfDebug( __METHOD__ . "\n" );
2842
2843                 $status = Status::newGood();
2844
2845                 if ( $this->mTitle->getDBkey() === '' ) {
2846                         $status->error( 'cannotdelete',
2847                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2848                         return $status;
2849                 }
2850
2851                 // Avoid PHP 7.1 warning of passing $this by reference
2852                 $wikiPage = $this;
2853
2854                 $user = is_null( $user ) ? $wgUser : $user;
2855                 if ( !Hooks::run( 'ArticleDelete',
2856                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2857                 ) ) {
2858                         if ( $status->isOK() ) {
2859                                 // Hook aborted but didn't set a fatal status
2860                                 $status->fatal( 'delete-hook-aborted' );
2861                         }
2862                         return $status;
2863                 }
2864
2865                 $dbw = wfGetDB( DB_MASTER );
2866                 $dbw->startAtomic( __METHOD__ );
2867
2868                 $this->loadPageData( self::READ_LATEST );
2869                 $id = $this->getId();
2870                 // T98706: lock the page from various other updates but avoid using
2871                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2872                 // the revisions queries (which also JOIN on user). Only lock the page
2873                 // row and CAS check on page_latest to see if the trx snapshot matches.
2874                 $lockedLatest = $this->lockAndGetLatest();
2875                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2876                         $dbw->endAtomic( __METHOD__ );
2877                         // Page not there or trx snapshot is stale
2878                         $status->error( 'cannotdelete',
2879                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2880                         return $status;
2881                 }
2882
2883                 // Given the lock above, we can be confident in the title and page ID values
2884                 $namespace = $this->getTitle()->getNamespace();
2885                 $dbKey = $this->getTitle()->getDBkey();
2886
2887                 // At this point we are now comitted to returning an OK
2888                 // status unless some DB query error or other exception comes up.
2889                 // This way callers don't have to call rollback() if $status is bad
2890                 // unless they actually try to catch exceptions (which is rare).
2891
2892                 // we need to remember the old content so we can use it to generate all deletion updates.
2893                 $revision = $this->getRevision();
2894                 try {
2895                         $content = $this->getContent( Revision::RAW );
2896                 } catch ( Exception $ex ) {
2897                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2898                                 . $ex->getMessage() );
2899
2900                         $content = null;
2901                 }
2902
2903                 $fields = Revision::selectFields();
2904                 $bitfield = false;
2905
2906                 // Bitfields to further suppress the content
2907                 if ( $suppress ) {
2908                         $bitfield = Revision::SUPPRESSED_ALL;
2909                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2910                 }
2911
2912                 // For now, shunt the revision data into the archive table.
2913                 // Text is *not* removed from the text table; bulk storage
2914                 // is left intact to avoid breaking block-compression or
2915                 // immutable storage schemes.
2916                 // In the future, we may keep revisions and mark them with
2917                 // the rev_deleted field, which is reserved for this purpose.
2918
2919                 // Get all of the page revisions
2920                 $res = $dbw->select(
2921                         'revision',
2922                         $fields,
2923                         [ 'rev_page' => $id ],
2924                         __METHOD__,
2925                         'FOR UPDATE'
2926                 );
2927                 // Build their equivalent archive rows
2928                 $rowsInsert = [];
2929                 foreach ( $res as $row ) {
2930                         $rowInsert = [
2931                                 'ar_namespace'  => $namespace,
2932                                 'ar_title'      => $dbKey,
2933                                 'ar_comment'    => $row->rev_comment,
2934                                 'ar_user'       => $row->rev_user,
2935                                 'ar_user_text'  => $row->rev_user_text,
2936                                 'ar_timestamp'  => $row->rev_timestamp,
2937                                 'ar_minor_edit' => $row->rev_minor_edit,
2938                                 'ar_rev_id'     => $row->rev_id,
2939                                 'ar_parent_id'  => $row->rev_parent_id,
2940                                 'ar_text_id'    => $row->rev_text_id,
2941                                 'ar_text'       => '',
2942                                 'ar_flags'      => '',
2943                                 'ar_len'        => $row->rev_len,
2944                                 'ar_page_id'    => $id,
2945                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2946                                 'ar_sha1'       => $row->rev_sha1,
2947                         ];
2948                         if ( $wgContentHandlerUseDB ) {
2949                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2950                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2951                         }
2952                         $rowsInsert[] = $rowInsert;
2953                 }
2954                 // Copy them into the archive table
2955                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2956                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2957                 $archivedRevisionCount = $dbw->affectedRows();
2958
2959                 // Clone the title and wikiPage, so we have the information we need when
2960                 // we log and run the ArticleDeleteComplete hook.
2961                 $logTitle = clone $this->mTitle;
2962                 $wikiPageBeforeDelete = clone $this;
2963
2964                 // Now that it's safely backed up, delete it
2965                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2966                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2967
2968                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2969                 $logtype = $suppress ? 'suppress' : 'delete';
2970
2971                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2972                 $logEntry->setPerformer( $user );
2973                 $logEntry->setTarget( $logTitle );
2974                 $logEntry->setComment( $reason );
2975                 $logEntry->setTags( $tags );
2976                 $logid = $logEntry->insert();
2977
2978                 $dbw->onTransactionPreCommitOrIdle(
2979                         function () use ( $dbw, $logEntry, $logid ) {
2980                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2981                                 $logEntry->publish( $logid );
2982                         },
2983                         __METHOD__
2984                 );
2985
2986                 $dbw->endAtomic( __METHOD__ );
2987
2988                 $this->doDeleteUpdates( $id, $content, $revision );
2989
2990                 Hooks::run( 'ArticleDeleteComplete', [
2991                         &$wikiPageBeforeDelete,
2992                         &$user,
2993                         $reason,
2994                         $id,
2995                         $content,
2996                         $logEntry,
2997                         $archivedRevisionCount
2998                 ] );
2999                 $status->value = $logid;
3000
3001                 // Show log excerpt on 404 pages rather than just a link
3002                 $cache = ObjectCache::getMainStashInstance();
3003                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
3004                 $cache->set( $key, 1, $cache::TTL_DAY );
3005
3006                 return $status;
3007         }
3008
3009         /**
3010          * Lock the page row for this title+id and return page_latest (or 0)
3011          *
3012          * @return integer Returns 0 if no row was found with this title+id
3013          * @since 1.27
3014          */
3015         public function lockAndGetLatest() {
3016                 return (int)wfGetDB( DB_MASTER )->selectField(
3017                         'page',
3018                         'page_latest',
3019                         [
3020                                 'page_id' => $this->getId(),
3021                                 // Typically page_id is enough, but some code might try to do
3022                                 // updates assuming the title is the same, so verify that
3023                                 'page_namespace' => $this->getTitle()->getNamespace(),
3024                                 'page_title' => $this->getTitle()->getDBkey()
3025                         ],
3026                         __METHOD__,
3027                         [ 'FOR UPDATE' ]
3028                 );
3029         }
3030
3031         /**
3032          * Do some database updates after deletion
3033          *
3034          * @param int $id The page_id value of the page being deleted
3035          * @param Content|null $content Optional page content to be used when determining
3036          *   the required updates. This may be needed because $this->getContent()
3037          *   may already return null when the page proper was deleted.
3038          * @param Revision|null $revision The latest page revision
3039          */
3040         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
3041                 try {
3042                         $countable = $this->isCountable();
3043                 } catch ( Exception $ex ) {
3044                         // fallback for deleting broken pages for which we cannot load the content for
3045                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3046                         $countable = false;
3047                 }
3048
3049                 // Update site status
3050                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3051
3052                 // Delete pagelinks, update secondary indexes, etc
3053                 $updates = $this->getDeletionUpdates( $content );
3054                 foreach ( $updates as $update ) {
3055                         DeferredUpdates::addUpdate( $update );
3056                 }
3057
3058                 // Reparse any pages transcluding this page
3059                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3060
3061                 // Reparse any pages including this image
3062                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3063                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3064                 }
3065
3066                 // Clear caches
3067                 WikiPage::onArticleDelete( $this->mTitle );
3068                 ResourceLoaderWikiModule::invalidateModuleCache(
3069                         $this->mTitle, $revision, null, wfWikiID()
3070                 );
3071
3072                 // Reset this object and the Title object
3073                 $this->loadFromRow( false, self::READ_LATEST );
3074
3075                 // Search engine
3076                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3077         }
3078
3079         /**
3080          * Roll back the most recent consecutive set of edits to a page
3081          * from the same user; fails if there are no eligible edits to
3082          * roll back to, e.g. user is the sole contributor. This function
3083          * performs permissions checks on $user, then calls commitRollback()
3084          * to do the dirty work
3085          *
3086          * @todo Separate the business/permission stuff out from backend code
3087          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3088          *
3089          * @param string $fromP Name of the user whose edits to rollback.
3090          * @param string $summary Custom summary. Set to default summary if empty.
3091          * @param string $token Rollback token.
3092          * @param bool $bot If true, mark all reverted edits as bot.
3093          *
3094          * @param array $resultDetails Array contains result-specific array of additional values
3095          *    'alreadyrolled' : 'current' (rev)
3096          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3097          *
3098          * @param User $user The user performing the rollback
3099          * @param array|null $tags Change tags to apply to the rollback
3100          * Callers are responsible for permission checks
3101          * (with ChangeTags::canAddTagsAccompanyingChange)
3102          *
3103          * @return array Array of errors, each error formatted as
3104          *   array(messagekey, param1, param2, ...).
3105          * On success, the array is empty.  This array can also be passed to
3106          * OutputPage::showPermissionsErrorPage().
3107          */
3108         public function doRollback(
3109                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3110         ) {
3111                 $resultDetails = null;
3112
3113                 // Check permissions
3114                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3115                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3116                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3117
3118                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3119                         $errors[] = [ 'sessionfailure' ];
3120                 }
3121
3122                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3123                         $errors[] = [ 'actionthrottledtext' ];
3124                 }
3125
3126                 // If there were errors, bail out now
3127                 if ( !empty( $errors ) ) {
3128                         return $errors;
3129                 }
3130
3131                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3132         }
3133
3134         /**
3135          * Backend implementation of doRollback(), please refer there for parameter
3136          * and return value documentation
3137          *
3138          * NOTE: This function does NOT check ANY permissions, it just commits the
3139          * rollback to the DB. Therefore, you should only call this function direct-
3140          * ly if you want to use custom permissions checks. If you don't, use
3141          * doRollback() instead.
3142          * @param string $fromP Name of the user whose edits to rollback.
3143          * @param string $summary Custom summary. Set to default summary if empty.
3144          * @param bool $bot If true, mark all reverted edits as bot.
3145          *
3146          * @param array $resultDetails Contains result-specific array of additional values
3147          * @param User $guser The user performing the rollback
3148          * @param array|null $tags Change tags to apply to the rollback
3149          * Callers are responsible for permission checks
3150          * (with ChangeTags::canAddTagsAccompanyingChange)
3151          *
3152          * @return array
3153          */
3154         public function commitRollback( $fromP, $summary, $bot,
3155                 &$resultDetails, User $guser, $tags = null
3156         ) {
3157                 global $wgUseRCPatrol, $wgContLang;
3158
3159                 $dbw = wfGetDB( DB_MASTER );
3160
3161                 if ( wfReadOnly() ) {
3162                         return [ [ 'readonlytext' ] ];
3163                 }
3164
3165                 // Get the last editor
3166                 $current = $this->getRevision();
3167                 if ( is_null( $current ) ) {
3168                         // Something wrong... no page?
3169                         return [ [ 'notanarticle' ] ];
3170                 }
3171
3172                 $from = str_replace( '_', ' ', $fromP );
3173                 // User name given should match up with the top revision.
3174                 // If the user was deleted then $from should be empty.
3175                 if ( $from != $current->getUserText() ) {
3176                         $resultDetails = [ 'current' => $current ];
3177                         return [ [ 'alreadyrolled',
3178                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3179                                 htmlspecialchars( $fromP ),
3180                                 htmlspecialchars( $current->getUserText() )
3181                         ] ];
3182                 }
3183
3184                 // Get the last edit not by this person...
3185                 // Note: these may not be public values
3186                 $user = intval( $current->getUser( Revision::RAW ) );
3187                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3188                 $s = $dbw->selectRow( 'revision',
3189                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3190                         [ 'rev_page' => $current->getPage(),
3191                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3192                         ], __METHOD__,
3193                         [ 'USE INDEX' => 'page_timestamp',
3194                                 'ORDER BY' => 'rev_timestamp DESC' ]
3195                         );
3196                 if ( $s === false ) {
3197                         // No one else ever edited this page
3198                         return [ [ 'cantrollback' ] ];
3199                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3200                         || $s->rev_deleted & Revision::DELETED_USER
3201                 ) {
3202                         // Only admins can see this text
3203                         return [ [ 'notvisiblerev' ] ];
3204                 }
3205
3206                 // Generate the edit summary if necessary
3207                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3208                 if ( empty( $summary ) ) {
3209                         if ( $from == '' ) { // no public user name
3210                                 $summary = wfMessage( 'revertpage-nouser' );
3211                         } else {
3212                                 $summary = wfMessage( 'revertpage' );
3213                         }
3214                 }
3215
3216                 // Allow the custom summary to use the same args as the default message
3217                 $args = [
3218                         $target->getUserText(), $from, $s->rev_id,
3219                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3220                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3221                 ];
3222                 if ( $summary instanceof Message ) {
3223                         $summary = $summary->params( $args )->inContentLanguage()->text();
3224                 } else {
3225                         $summary = wfMsgReplaceArgs( $summary, $args );
3226                 }
3227
3228                 // Trim spaces on user supplied text
3229                 $summary = trim( $summary );
3230
3231                 // Truncate for whole multibyte characters.
3232                 $summary = $wgContLang->truncate( $summary, 255 );
3233
3234                 // Save
3235                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3236
3237                 if ( $guser->isAllowed( 'minoredit' ) ) {
3238                         $flags |= EDIT_MINOR;
3239                 }
3240
3241                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3242                         $flags |= EDIT_FORCE_BOT;
3243                 }
3244
3245                 $targetContent = $target->getContent();
3246                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3247
3248                 // Actually store the edit
3249                 $status = $this->doEditContent(
3250                         $targetContent,
3251                         $summary,
3252                         $flags,
3253                         $target->getId(),
3254                         $guser,
3255                         null,
3256                         $tags
3257                 );
3258
3259                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3260                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3261                 $set = [];
3262                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3263                         // Mark all reverted edits as bot
3264                         $set['rc_bot'] = 1;
3265                 }
3266
3267                 if ( $wgUseRCPatrol ) {
3268                         // Mark all reverted edits as patrolled
3269                         $set['rc_patrolled'] = 1;
3270                 }
3271
3272                 if ( count( $set ) ) {
3273                         $dbw->update( 'recentchanges', $set,
3274                                 [ /* WHERE */
3275                                         'rc_cur_id' => $current->getPage(),
3276                                         'rc_user_text' => $current->getUserText(),
3277                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3278                                 ],
3279                                 __METHOD__
3280                         );
3281                 }
3282
3283                 if ( !$status->isOK() ) {
3284                         return $status->getErrorsArray();
3285                 }
3286
3287                 // raise error, when the edit is an edit without a new version
3288                 $statusRev = isset( $status->value['revision'] )
3289                         ? $status->value['revision']
3290                         : null;
3291                 if ( !( $statusRev instanceof Revision ) ) {
3292                         $resultDetails = [ 'current' => $current ];
3293                         return [ [ 'alreadyrolled',
3294                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3295                                         htmlspecialchars( $fromP ),
3296                                         htmlspecialchars( $current->getUserText() )
3297                         ] ];
3298                 }
3299
3300                 if ( $changingContentModel ) {
3301                         // If the content model changed during the rollback,
3302                         // make sure it gets logged to Special:Log/contentmodel
3303                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3304                         $log->setPerformer( $guser );
3305                         $log->setTarget( $this->mTitle );
3306                         $log->setComment( $summary );
3307                         $log->setParameters( [
3308                                 '4::oldmodel' => $current->getContentModel(),
3309                                 '5::newmodel' => $targetContent->getModel(),
3310                         ] );
3311
3312                         $logId = $log->insert( $dbw );
3313                         $log->publish( $logId );
3314                 }
3315
3316                 $revId = $statusRev->getId();
3317
3318                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3319
3320                 $resultDetails = [
3321                         'summary' => $summary,
3322                         'current' => $current,
3323                         'target' => $target,
3324                         'newid' => $revId
3325                 ];
3326
3327                 return [];
3328         }
3329
3330         /**
3331          * The onArticle*() functions are supposed to be a kind of hooks
3332          * which should be called whenever any of the specified actions
3333          * are done.
3334          *
3335          * This is a good place to put code to clear caches, for instance.
3336          *
3337          * This is called on page move and undelete, as well as edit
3338          *
3339          * @param Title $title
3340          */
3341         public static function onArticleCreate( Title $title ) {
3342                 // Update existence markers on article/talk tabs...
3343                 $other = $title->getOtherPage();
3344
3345                 $other->purgeSquid();
3346
3347                 $title->touchLinks();
3348                 $title->purgeSquid();
3349                 $title->deleteTitleProtection();
3350
3351                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3352
3353                 if ( $title->getNamespace() == NS_CATEGORY ) {
3354                         // Load the Category object, which will schedule a job to create
3355                         // the category table row if necessary. Checking a replica DB is ok
3356                         // here, in the worst case it'll run an unnecessary recount job on
3357                         // a category that probably doesn't have many members.
3358                         Category::newFromTitle( $title )->getID();
3359                 }
3360         }
3361
3362         /**
3363          * Clears caches when article is deleted
3364          *
3365          * @param Title $title
3366          */
3367         public static function onArticleDelete( Title $title ) {
3368                 // Update existence markers on article/talk tabs...
3369                 $other = $title->getOtherPage();
3370
3371                 $other->purgeSquid();
3372
3373                 $title->touchLinks();
3374                 $title->purgeSquid();
3375
3376                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3377
3378                 // File cache
3379                 HTMLFileCache::clearFileCache( $title );
3380                 InfoAction::invalidateCache( $title );
3381
3382                 // Messages
3383                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3384                         MessageCache::singleton()->updateMessageOverride( $title, null );
3385                 }
3386
3387                 // Images
3388                 if ( $title->getNamespace() == NS_FILE ) {
3389                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3390                 }
3391
3392                 // User talk pages
3393                 if ( $title->getNamespace() == NS_USER_TALK ) {
3394                         $user = User::newFromName( $title->getText(), false );
3395                         if ( $user ) {
3396                                 $user->setNewtalk( false );
3397                         }
3398                 }
3399
3400                 // Image redirects
3401                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3402         }
3403
3404         /**
3405          * Purge caches on page update etc
3406          *
3407          * @param Title $title
3408          * @param Revision|null $revision Revision that was just saved, may be null
3409          */
3410         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3411                 // Invalidate caches of articles which include this page
3412                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3413
3414                 // Invalidate the caches of all pages which redirect here
3415                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3416
3417                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3418
3419                 // Purge CDN for this page only
3420                 $title->purgeSquid();
3421                 // Clear file cache for this page only
3422                 HTMLFileCache::clearFileCache( $title );
3423
3424                 $revid = $revision ? $revision->getId() : null;
3425                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3426                         InfoAction::invalidateCache( $title, $revid );
3427                 } );
3428         }
3429
3430         /**#@-*/
3431
3432         /**
3433          * Returns a list of categories this page is a member of.
3434          * Results will include hidden categories
3435          *
3436          * @return TitleArray
3437          */
3438         public function getCategories() {
3439                 $id = $this->getId();
3440                 if ( $id == 0 ) {
3441                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3442                 }
3443
3444                 $dbr = wfGetDB( DB_REPLICA );
3445                 $res = $dbr->select( 'categorylinks',
3446                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3447                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3448                         // as not being aliases, and NS_CATEGORY is numeric
3449                         [ 'cl_from' => $id ],
3450                         __METHOD__ );
3451
3452                 return TitleArray::newFromResult( $res );
3453         }
3454
3455         /**
3456          * Returns a list of hidden categories this page is a member of.
3457          * Uses the page_props and categorylinks tables.
3458          *
3459          * @return array Array of Title objects
3460          */
3461         public function getHiddenCategories() {
3462                 $result = [];
3463                 $id = $this->getId();
3464
3465                 if ( $id == 0 ) {
3466                         return [];
3467                 }
3468
3469                 $dbr = wfGetDB( DB_REPLICA );
3470                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3471                         [ 'cl_to' ],
3472                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3473                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3474                         __METHOD__ );
3475
3476                 if ( $res !== false ) {
3477                         foreach ( $res as $row ) {
3478                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3479                         }
3480                 }
3481
3482                 return $result;
3483         }
3484
3485         /**
3486          * Auto-generates a deletion reason
3487          *
3488          * @param bool &$hasHistory Whether the page has a history
3489          * @return string|bool String containing deletion reason or empty string, or boolean false
3490          *    if no revision occurred
3491          */
3492         public function getAutoDeleteReason( &$hasHistory ) {
3493                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3494         }
3495
3496         /**
3497          * Update all the appropriate counts in the category table, given that
3498          * we've added the categories $added and deleted the categories $deleted.
3499          *
3500          * This should only be called from deferred updates or jobs to avoid contention.
3501          *
3502          * @param array $added The names of categories that were added
3503          * @param array $deleted The names of categories that were deleted
3504          * @param integer $id Page ID (this should be the original deleted page ID)
3505          */
3506         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3507                 $id = $id ?: $this->getId();
3508                 $ns = $this->getTitle()->getNamespace();
3509
3510                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3511                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3512                 if ( $ns == NS_CATEGORY ) {
3513                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3514                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3515                 } elseif ( $ns == NS_FILE ) {
3516                         $addFields[] = 'cat_files = cat_files + 1';
3517                         $removeFields[] = 'cat_files = cat_files - 1';
3518                 }
3519
3520                 $dbw = wfGetDB( DB_MASTER );
3521
3522                 if ( count( $added ) ) {
3523                         $existingAdded = $dbw->selectFieldValues(
3524                                 'category',
3525                                 'cat_title',
3526                                 [ 'cat_title' => $added ],
3527                                 __METHOD__
3528                         );
3529
3530                         // For category rows that already exist, do a plain
3531                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3532                         // to avoid creating gaps in the cat_id sequence.
3533                         if ( count( $existingAdded ) ) {
3534                                 $dbw->update(
3535                                         'category',
3536                                         $addFields,
3537                                         [ 'cat_title' => $existingAdded ],
3538                                         __METHOD__
3539                                 );
3540                         }
3541
3542                         $missingAdded = array_diff( $added, $existingAdded );
3543                         if ( count( $missingAdded ) ) {
3544                                 $insertRows = [];
3545                                 foreach ( $missingAdded as $cat ) {
3546                                         $insertRows[] = [
3547                                                 'cat_title'   => $cat,
3548                                                 'cat_pages'   => 1,
3549                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3550                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3551                                         ];
3552                                 }
3553                                 $dbw->upsert(
3554                                         'category',
3555                                         $insertRows,
3556                                         [ 'cat_title' ],
3557                                         $addFields,
3558                                         __METHOD__
3559                                 );
3560                         }
3561                 }
3562
3563                 if ( count( $deleted ) ) {
3564                         $dbw->update(
3565                                 'category',
3566                                 $removeFields,
3567                                 [ 'cat_title' => $deleted ],
3568                                 __METHOD__
3569                         );
3570                 }
3571
3572                 foreach ( $added as $catName ) {
3573                         $cat = Category::newFromName( $catName );
3574                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3575                 }
3576
3577                 foreach ( $deleted as $catName ) {
3578                         $cat = Category::newFromName( $catName );
3579                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3580                 }
3581
3582                 // Refresh counts on categories that should be empty now, to
3583                 // trigger possible deletion. Check master for the most
3584                 // up-to-date cat_pages.
3585                 if ( count( $deleted ) ) {
3586                         $rows = $dbw->select(
3587                                 'category',
3588                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3589                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3590                                 __METHOD__
3591                         );
3592                         foreach ( $rows as $row ) {
3593                                 $cat = Category::newFromRow( $row );
3594                                 $cat->refreshCounts();
3595                         }
3596                 }
3597         }
3598
3599         /**
3600          * Opportunistically enqueue link update jobs given fresh parser output if useful
3601          *
3602          * @param ParserOutput $parserOutput Current version page output
3603          * @since 1.25
3604          */
3605         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3606                 if ( wfReadOnly() ) {
3607                         return;
3608                 }
3609
3610                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3611                         [ $this, $this->mTitle, $parserOutput ]
3612                 ) ) {
3613                         return;
3614                 }
3615
3616                 $config = RequestContext::getMain()->getConfig();
3617
3618                 $params = [
3619                         'isOpportunistic' => true,
3620                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3621                 ];
3622
3623                 if ( $this->mTitle->areRestrictionsCascading() ) {
3624                         // If the page is cascade protecting, the links should really be up-to-date
3625                         JobQueueGroup::singleton()->lazyPush(
3626                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3627                         );
3628                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3629                         // Assume the output contains "dynamic" time/random based magic words.
3630                         // Only update pages that expired due to dynamic content and NOT due to edits
3631                         // to referenced templates/files. When the cache expires due to dynamic content,
3632                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3633                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3634                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3635                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3636                                 // If a page is uncacheable, do not keep spamming a job for it.
3637                                 // Although it would be de-duplicated, it would still waste I/O.
3638                                 $cache = ObjectCache::getLocalClusterInstance();
3639                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3640                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3641                                 if ( $cache->add( $key, time(), $ttl ) ) {
3642                                         JobQueueGroup::singleton()->lazyPush(
3643                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3644                                         );
3645                                 }
3646                         }
3647                 }
3648         }
3649
3650         /**
3651          * Returns a list of updates to be performed when this page is deleted. The
3652          * updates should remove any information about this page from secondary data
3653          * stores such as links tables.
3654          *
3655          * @param Content|null $content Optional Content object for determining the
3656          *   necessary updates.
3657          * @return DeferrableUpdate[]
3658          */
3659         public function getDeletionUpdates( Content $content = null ) {
3660                 if ( !$content ) {
3661                         // load content object, which may be used to determine the necessary updates.
3662                         // XXX: the content may not be needed to determine the updates.
3663                         try {
3664                                 $content = $this->getContent( Revision::RAW );
3665                         } catch ( Exception $ex ) {
3666                                 // If we can't load the content, something is wrong. Perhaps that's why
3667                                 // the user is trying to delete the page, so let's not fail in that case.
3668                                 // Note that doDeleteArticleReal() will already have logged an issue with
3669                                 // loading the content.
3670                         }
3671                 }
3672
3673                 if ( !$content ) {
3674                         $updates = [];
3675                 } else {
3676                         $updates = $content->getDeletionUpdates( $this );
3677                 }
3678
3679                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3680                 return $updates;
3681         }
3682
3683         /**
3684          * Whether this content displayed on this page
3685          * comes from the local database
3686          *
3687          * @since 1.28
3688          * @return bool
3689          */
3690         public function isLocal() {
3691                 return true;
3692         }
3693
3694         /**
3695          * The display name for the site this content
3696          * come from. If a subclass overrides isLocal(),
3697          * this could return something other than the
3698          * current site name
3699          *
3700          * @since 1.28
3701          * @return string
3702          */
3703         public function getWikiDisplayName() {
3704                 global $wgSitename;
3705                 return $wgSitename;
3706         }
3707
3708         /**
3709          * Get the source URL for the content on this page,
3710          * typically the canonical URL, but may be a remote
3711          * link if the content comes from another site
3712          *
3713          * @since 1.28
3714          * @return string
3715          */
3716         public function getSourceURL() {
3717                 return $this->getTitle()->getCanonicalURL();
3718         }
3719 }