includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 $page = null;
 125                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 126                         return $page;
 127                 }
 128
 129                 switch ( $ns ) {
 130                         case NS_FILE:
 131                                 $page = new WikiFilePage( $title );
 132                                 break;
 133                         case NS_CATEGORY:
 134                                 $page = new WikiCategoryPage( $title );
 135                                 break;
 136                         default:
 137                                 $page = new WikiPage( $title );
 138                 }
 139
 140                 return $page;
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          *
 146          * @param int $id Article ID to load
 147          * @param string|int $from One of the following values:
 148          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 150          *
 151          * @return WikiPage|null
 152          */
 153         public static function newFromID( $id, $from = 'fromdb' ) {
 154                 // page id's are never 0 or negative, see bug 61166
 155                 if ( $id < 1 ) {
 156                         return null;
 157                 }
 158
 159                 $from = self::convertSelectType( $from );
 160                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 161                 $row = $db->selectRow(
 162                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 163                 if ( !$row ) {
 164                         return null;
 165                 }
 166                 return self::newFromRow( $row, $from );
 167         }
 168
 169         /**
 170          * Constructor from a database row
 171          *
 172          * @since 1.20
 173          * @param object $row Database row containing at least fields returned by selectFields().
 174          * @param string|int $from Source of $data:
 175          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 176          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 177          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 178          * @return WikiPage
 179          */
 180         public static function newFromRow( $row, $from = 'fromdb' ) {
 181                 $page = self::factory( Title::newFromRow( $row ) );
 182                 $page->loadFromRow( $row, $from );
 183                 return $page;
 184         }
 185
 186         /**
 187          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 188          *
 189          * @param object|string|int $type
 190          * @return mixed
 191          */
 192         private static function convertSelectType( $type ) {
 193                 switch ( $type ) {
 194                 case 'fromdb':
 195                         return self::READ_NORMAL;
 196                 case 'fromdbmaster':
 197                         return self::READ_LATEST;
 198                 case 'forupdate':
 199                         return self::READ_LOCKING;
 200                 default:
 201                         // It may already be an integer or whatever else
 202                         return $type;
 203                 }
 204         }
 205
 206         /**
 207          * @todo Move this UI stuff somewhere else
 208          *
 209          * @see ContentHandler::getActionOverrides
 210          */
 211         public function getActionOverrides() {
 212                 return $this->getContentHandler()->getActionOverrides();
 213         }
 214
 215         /**
 216          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 217          *
 218          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 219          *
 220          * @return ContentHandler
 221          *
 222          * @since 1.21
 223          */
 224         public function getContentHandler() {
 225                 return ContentHandler::getForModelID( $this->getContentModel() );
 226         }
 227
 228         /**
 229          * Get the title object of the article
 230          * @return Title Title object of this page
 231          */
 232         public function getTitle() {
 233                 return $this->mTitle;
 234         }
 235
 236         /**
 237          * Clear the object
 238          * @return void
 239          */
 240         public function clear() {
 241                 $this->mDataLoaded = false;
 242                 $this->mDataLoadedFrom = self::READ_NONE;
 243
 244                 $this->clearCacheFields();
 245         }
 246
 247         /**
 248          * Clear the object cache fields
 249          * @return void
 250          */
 251         protected function clearCacheFields() {
 252                 $this->mId = null;
 253                 $this->mRedirectTarget = null; // Title object if set
 254                 $this->mLastRevision = null; // Latest revision
 255                 $this->mTouched = '19700101000000';
 256                 $this->mLinksUpdated = '19700101000000';
 257                 $this->mTimestamp = '';
 258                 $this->mIsRedirect = false;
 259                 $this->mLatest = false;
 260                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 261                 // the requested rev ID and content against the cached one for equality. For most
 262                 // content types, the output should not change during the lifetime of this cache.
 263                 // Clearing it can cause extra parses on edit for no reason.
 264         }
 265
 266         /**
 267          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 268          * @return void
 269          * @since 1.23
 270          */
 271         public function clearPreparedEdit() {
 272                 $this->mPreparedEdit = false;
 273         }
 274
 275         /**
 276          * Return the list of revision fields that should be selected to create
 277          * a new page.
 278          *
 279          * @return array
 280          */
 281         public static function selectFields() {
 282                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 283
 284                 $fields = [
 285                         'page_id',
 286                         'page_namespace',
 287                         'page_title',
 288                         'page_restrictions',
 289                         'page_is_redirect',
 290                         'page_is_new',
 291                         'page_random',
 292                         'page_touched',
 293                         'page_links_updated',
 294                         'page_latest',
 295                         'page_len',
 296                 ];
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 if ( $wgPageLanguageUseDB ) {
 303                         $fields[] = 'page_lang';
 304                 }
 305
 306                 return $fields;
 307         }
 308
 309         /**
 310          * Fetch a page record with the given conditions
 311          * @param IDatabase $dbr
 312          * @param array $conditions
 313          * @param array $options
 314          * @return object|bool Database result resource, or false on failure
 315          */
 316         protected function pageData( $dbr, $conditions, $options = [] ) {
 317                 $fields = self::selectFields();
 318
 319                 // Avoid PHP 7.1 warning of passing $this by reference
 320                 $wikiPage = $this;
 321
 322                 Hooks::run( 'ArticlePageDataBefore', [ &$wikiPage, &$fields ] );
 323
 324                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 325
 326                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 327
 328                 return $row;
 329         }
 330
 331         /**
 332          * Fetch a page record matching the Title object's namespace and title
 333          * using a sanitized title string
 334          *
 335          * @param IDatabase $dbr
 336          * @param Title $title
 337          * @param array $options
 338          * @return object|bool Database result resource, or false on failure
 339          */
 340         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 341                 return $this->pageData( $dbr, [
 342                         'page_namespace' => $title->getNamespace(),
 343                         'page_title' => $title->getDBkey() ], $options );
 344         }
 345
 346         /**
 347          * Fetch a page record matching the requested ID
 348          *
 349          * @param IDatabase $dbr
 350          * @param int $id
 351          * @param array $options
 352          * @return object|bool Database result resource, or false on failure
 353          */
 354         public function pageDataFromId( $dbr, $id, $options = [] ) {
 355                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 356         }
 357
 358         /**
 359          * Load the object from a given source by title
 360          *
 361          * @param object|string|int $from One of the following:
 362          *   - A DB query result object.
 363          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 364          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 365          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 366          *     using SELECT FOR UPDATE.
 367          *
 368          * @return void
 369          */
 370         public function loadPageData( $from = 'fromdb' ) {
 371                 $from = self::convertSelectType( $from );
 372                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 373                         // We already have the data from the correct location, no need to load it twice.
 374                         return;
 375                 }
 376
 377                 if ( is_int( $from ) ) {
 378                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 379                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 380
 381                         if ( !$data
 382                                 && $index == DB_REPLICA
 383                                 && wfGetLB()->getServerCount() > 1
 384                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 385                         ) {
 386                                 $from = self::READ_LATEST;
 387                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 388                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 389                         }
 390                 } else {
 391                         // No idea from where the caller got this data, assume replica DB.
 392                         $data = $from;
 393                         $from = self::READ_NORMAL;
 394                 }
 395
 396                 $this->loadFromRow( $data, $from );
 397         }
 398
 399         /**
 400          * Load the object from a database row
 401          *
 402          * @since 1.20
 403          * @param object|bool $data DB row containing fields returned by selectFields() or false
 404          * @param string|int $from One of the following:
 405          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 406          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 407          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 408          *          the master DB using SELECT FOR UPDATE
 409          */
 410         public function loadFromRow( $data, $from ) {
 411                 $lc = LinkCache::singleton();
 412                 $lc->clearLink( $this->mTitle );
 413
 414                 if ( $data ) {
 415                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 416
 417                         $this->mTitle->loadFromRow( $data );
 418
 419                         // Old-fashioned restrictions
 420                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 421
 422                         $this->mId = intval( $data->page_id );
 423                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 424                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 425                         $this->mIsRedirect = intval( $data->page_is_redirect );
 426                         $this->mLatest = intval( $data->page_latest );
 427                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 428                         // Double-check the ID of any cached latest Revision object for consistency.
 429                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 430                                 $this->mLastRevision = null;
 431                                 $this->mTimestamp = '';
 432                         }
 433                 } else {
 434                         $lc->addBadLinkObj( $this->mTitle );
 435
 436                         $this->mTitle->loadFromRow( false );
 437
 438                         $this->clearCacheFields();
 439
 440                         $this->mId = 0;
 441                 }
 442
 443                 $this->mDataLoaded = true;
 444                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 445         }
 446
 447         /**
 448          * @return int Page ID
 449          */
 450         public function getId() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454                 return $this->mId;
 455         }
 456
 457         /**
 458          * @return bool Whether or not the page exists in the database
 459          */
 460         public function exists() {
 461                 if ( !$this->mDataLoaded ) {
 462                         $this->loadPageData();
 463                 }
 464                 return $this->mId > 0;
 465         }
 466
 467         /**
 468          * Check if this page is something we're going to be showing
 469          * some sort of sensible content for. If we return false, page
 470          * views (plain action=view) will return an HTTP 404 response,
 471          * so spiders and robots can know they're following a bad link.
 472          *
 473          * @return bool
 474          */
 475         public function hasViewableContent() {
 476                 return $this->mTitle->isKnown();
 477         }
 478
 479         /**
 480          * Tests if the article content represents a redirect
 481          *
 482          * @return bool
 483          */
 484         public function isRedirect() {
 485                 if ( !$this->mDataLoaded ) {
 486                         $this->loadPageData();
 487                 }
 488
 489                 return (bool)$this->mIsRedirect;
 490         }
 491
 492         /**
 493          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 494          *
 495          * Will use the revisions actual content model if the page exists,
 496          * and the page's default if the page doesn't exist yet.
 497          *
 498          * @return string
 499          *
 500          * @since 1.21
 501          */
 502         public function getContentModel() {
 503                 if ( $this->exists() ) {
 504                         $cache = ObjectCache::getMainWANInstance();
 505
 506                         return $cache->getWithSetCallback(
 507                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 508                                 $cache::TTL_MONTH,
 509                                 function () {
 510                                         $rev = $this->getRevision();
 511                                         if ( $rev ) {
 512                                                 // Look at the revision's actual content model
 513                                                 return $rev->getContentModel();
 514                                         } else {
 515                                                 $title = $this->mTitle->getPrefixedDBkey();
 516                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 517                                                 return $this->mTitle->getContentModel();
 518                                         }
 519                                 }
 520                         );
 521                 }
 522
 523                 // use the default model for this page
 524                 return $this->mTitle->getContentModel();
 525         }
 526
 527         /**
 528          * Loads page_touched and returns a value indicating if it should be used
 529          * @return bool True if this page exists and is not a redirect
 530          */
 531         public function checkTouched() {
 532                 if ( !$this->mDataLoaded ) {
 533                         $this->loadPageData();
 534                 }
 535                 return ( $this->mId && !$this->mIsRedirect );
 536         }
 537
 538         /**
 539          * Get the page_touched field
 540          * @return string Containing GMT timestamp
 541          */
 542         public function getTouched() {
 543                 if ( !$this->mDataLoaded ) {
 544                         $this->loadPageData();
 545                 }
 546                 return $this->mTouched;
 547         }
 548
 549         /**
 550          * Get the page_links_updated field
 551          * @return string|null Containing GMT timestamp
 552          */
 553         public function getLinksTimestamp() {
 554                 if ( !$this->mDataLoaded ) {
 555                         $this->loadPageData();
 556                 }
 557                 return $this->mLinksUpdated;
 558         }
 559
 560         /**
 561          * Get the page_latest field
 562          * @return int The rev_id of current revision
 563          */
 564         public function getLatest() {
 565                 if ( !$this->mDataLoaded ) {
 566                         $this->loadPageData();
 567                 }
 568                 return (int)$this->mLatest;
 569         }
 570
 571         /**
 572          * Get the Revision object of the oldest revision
 573          * @return Revision|null
 574          */
 575         public function getOldestRevision() {
 576
 577                 // Try using the replica DB first, then try the master
 578                 $continue = 2;
 579                 $db = wfGetDB( DB_REPLICA );
 580                 $revSelectFields = Revision::selectFields();
 581
 582                 $row = null;
 583                 while ( $continue ) {
 584                         $row = $db->selectRow(
 585                                 [ 'revision' ],
 586                                 $revSelectFields,
 587                                 [
 588                                         'rev_page' => $this->getId()
 589                                 ],
 590                                 __METHOD__,
 591                                 [
 592                                         'ORDER BY' => 'rev_timestamp ASC'
 593                                 ]
 594                         );
 595
 596                         if ( $row ) {
 597                                 $continue = 0;
 598                         } else {
 599                                 $db = wfGetDB( DB_MASTER );
 600                                 $continue--;
 601                         }
 602                 }
 603
 604                 return $row ? Revision::newFromRow( $row ) : null;
 605         }
 606
 607         /**
 608          * Loads everything except the text
 609          * This isn't necessary for all uses, so it's only done if needed.
 610          */
 611         protected function loadLastEdit() {
 612                 if ( $this->mLastRevision !== null ) {
 613                         return; // already loaded
 614                 }
 615
 616                 $latest = $this->getLatest();
 617                 if ( !$latest ) {
 618                         return; // page doesn't exist or is missing page_latest info
 619                 }
 620
 621                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 622                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 623                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 624                         // transactions, where S1 normally only sees changes committed before the first S1
 625                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 626                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 627                         // happened after the first S1 SELECT.
 628                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 629                         $flags = Revision::READ_LOCKING;
 630                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 631                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 632                         // Bug T93976: if page_latest was loaded from the master, fetch the
 633                         // revision from there as well, as it may not exist yet on a replica DB.
 634                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 635                         $flags = Revision::READ_LATEST;
 636                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 637                 } else {
 638                         $dbr = wfGetDB( DB_REPLICA );
 639                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 640                 }
 641
 642                 if ( $revision ) { // sanity
 643                         $this->setLastEdit( $revision );
 644                 }
 645         }
 646
 647         /**
 648          * Set the latest revision
 649          * @param Revision $revision
 650          */
 651         protected function setLastEdit( Revision $revision ) {
 652                 $this->mLastRevision = $revision;
 653                 $this->mTimestamp = $revision->getTimestamp();
 654         }
 655
 656         /**
 657          * Get the latest revision
 658          * @return Revision|null
 659          */
 660         public function getRevision() {
 661                 $this->loadLastEdit();
 662                 if ( $this->mLastRevision ) {
 663                         return $this->mLastRevision;
 664                 }
 665                 return null;
 666         }
 667
 668         /**
 669          * Get the content of the current revision. No side-effects...
 670          *
 671          * @param int $audience One of:
 672          *   Revision::FOR_PUBLIC       to be displayed to all users
 673          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 674          *   Revision::RAW              get the text regardless of permissions
 675          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 676          *   to the $audience parameter
 677          * @return Content|null The content of the current revision
 678          *
 679          * @since 1.21
 680          */
 681         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 682                 $this->loadLastEdit();
 683                 if ( $this->mLastRevision ) {
 684                         return $this->mLastRevision->getContent( $audience, $user );
 685                 }
 686                 return null;
 687         }
 688
 689         /**
 690          * @return string MW timestamp of last article revision
 691          */
 692         public function getTimestamp() {
 693                 // Check if the field has been filled by WikiPage::setTimestamp()
 694                 if ( !$this->mTimestamp ) {
 695                         $this->loadLastEdit();
 696                 }
 697
 698                 return wfTimestamp( TS_MW, $this->mTimestamp );
 699         }
 700
 701         /**
 702          * Set the page timestamp (use only to avoid DB queries)
 703          * @param string $ts MW timestamp of last article revision
 704          * @return void
 705          */
 706         public function setTimestamp( $ts ) {
 707                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 708         }
 709
 710         /**
 711          * @param int $audience One of:
 712          *   Revision::FOR_PUBLIC       to be displayed to all users
 713          *   Revision::FOR_THIS_USER    to be displayed to the given user
 714          *   Revision::RAW              get the text regardless of permissions
 715          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 716          *   to the $audience parameter
 717          * @return int User ID for the user that made the last article revision
 718          */
 719         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 720                 $this->loadLastEdit();
 721                 if ( $this->mLastRevision ) {
 722                         return $this->mLastRevision->getUser( $audience, $user );
 723                 } else {
 724                         return -1;
 725                 }
 726         }
 727
 728         /**
 729          * Get the User object of the user who created the page
 730          * @param int $audience One of:
 731          *   Revision::FOR_PUBLIC       to be displayed to all users
 732          *   Revision::FOR_THIS_USER    to be displayed to the given user
 733          *   Revision::RAW              get the text regardless of permissions
 734          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 735          *   to the $audience parameter
 736          * @return User|null
 737          */
 738         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 739                 $revision = $this->getOldestRevision();
 740                 if ( $revision ) {
 741                         $userName = $revision->getUserText( $audience, $user );
 742                         return User::newFromName( $userName, false );
 743                 } else {
 744                         return null;
 745                 }
 746         }
 747
 748         /**
 749          * @param int $audience One of:
 750          *   Revision::FOR_PUBLIC       to be displayed to all users
 751          *   Revision::FOR_THIS_USER    to be displayed to the given user
 752          *   Revision::RAW              get the text regardless of permissions
 753          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 754          *   to the $audience parameter
 755          * @return string Username of the user that made the last article revision
 756          */
 757         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 758                 $this->loadLastEdit();
 759                 if ( $this->mLastRevision ) {
 760                         return $this->mLastRevision->getUserText( $audience, $user );
 761                 } else {
 762                         return '';
 763                 }
 764         }
 765
 766         /**
 767          * @param int $audience One of:
 768          *   Revision::FOR_PUBLIC       to be displayed to all users
 769          *   Revision::FOR_THIS_USER    to be displayed to the given user
 770          *   Revision::RAW              get the text regardless of permissions
 771          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 772          *   to the $audience parameter
 773          * @return string Comment stored for the last article revision
 774          */
 775         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 776                 $this->loadLastEdit();
 777                 if ( $this->mLastRevision ) {
 778                         return $this->mLastRevision->getComment( $audience, $user );
 779                 } else {
 780                         return '';
 781                 }
 782         }
 783
 784         /**
 785          * Returns true if last revision was marked as "minor edit"
 786          *
 787          * @return bool Minor edit indicator for the last article revision.
 788          */
 789         public function getMinorEdit() {
 790                 $this->loadLastEdit();
 791                 if ( $this->mLastRevision ) {
 792                         return $this->mLastRevision->isMinor();
 793                 } else {
 794                         return false;
 795                 }
 796         }
 797
 798         /**
 799          * Determine whether a page would be suitable for being counted as an
 800          * article in the site_stats table based on the title & its content
 801          *
 802          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 803          *   if false, the current database state will be used
 804          * @return bool
 805          */
 806         public function isCountable( $editInfo = false ) {
 807                 global $wgArticleCountMethod;
 808
 809                 if ( !$this->mTitle->isContentPage() ) {
 810                         return false;
 811                 }
 812
 813                 if ( $editInfo ) {
 814                         $content = $editInfo->pstContent;
 815                 } else {
 816                         $content = $this->getContent();
 817                 }
 818
 819                 if ( !$content || $content->isRedirect() ) {
 820                         return false;
 821                 }
 822
 823                 $hasLinks = null;
 824
 825                 if ( $wgArticleCountMethod === 'link' ) {
 826                         // nasty special case to avoid re-parsing to detect links
 827
 828                         if ( $editInfo ) {
 829                                 // ParserOutput::getLinks() is a 2D array of page links, so
 830                                 // to be really correct we would need to recurse in the array
 831                                 // but the main array should only have items in it if there are
 832                                 // links.
 833                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 834                         } else {
 835                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 836                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 837                         }
 838                 }
 839
 840                 return $content->isCountable( $hasLinks );
 841         }
 842
 843         /**
 844          * If this page is a redirect, get its target
 845          *
 846          * The target will be fetched from the redirect table if possible.
 847          * If this page doesn't have an entry there, call insertRedirect()
 848          * @return Title|null Title object, or null if this page is not a redirect
 849          */
 850         public function getRedirectTarget() {
 851                 if ( !$this->mTitle->isRedirect() ) {
 852                         return null;
 853                 }
 854
 855                 if ( $this->mRedirectTarget !== null ) {
 856                         return $this->mRedirectTarget;
 857                 }
 858
 859                 // Query the redirect table
 860                 $dbr = wfGetDB( DB_REPLICA );
 861                 $row = $dbr->selectRow( 'redirect',
 862                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 863                         [ 'rd_from' => $this->getId() ],
 864                         __METHOD__
 865                 );
 866
 867                 // rd_fragment and rd_interwiki were added later, populate them if empty
 868                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 869                         $this->mRedirectTarget = Title::makeTitle(
 870                                 $row->rd_namespace, $row->rd_title,
 871                                 $row->rd_fragment, $row->rd_interwiki
 872                         );
 873                         return $this->mRedirectTarget;
 874                 }
 875
 876                 // This page doesn't have an entry in the redirect table
 877                 $this->mRedirectTarget = $this->insertRedirect();
 878                 return $this->mRedirectTarget;
 879         }
 880
 881         /**
 882          * Insert an entry for this page into the redirect table if the content is a redirect
 883          *
 884          * The database update will be deferred via DeferredUpdates
 885          *
 886          * Don't call this function directly unless you know what you're doing.
 887          * @return Title|null Title object or null if not a redirect
 888          */
 889         public function insertRedirect() {
 890                 $content = $this->getContent();
 891                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 892                 if ( !$retval ) {
 893                         return null;
 894                 }
 895
 896                 // Update the DB post-send if the page has not cached since now
 897                 $that = $this;
 898                 $latest = $this->getLatest();
 899                 DeferredUpdates::addCallableUpdate(
 900                         function () use ( $that, $retval, $latest ) {
 901                                 $that->insertRedirectEntry( $retval, $latest );
 902                         },
 903                         DeferredUpdates::POSTSEND,
 904                         wfGetDB( DB_MASTER )
 905                 );
 906
 907                 return $retval;
 908         }
 909
 910         /**
 911          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 912          * @param Title $rt Redirect target
 913          * @param int|null $oldLatest Prior page_latest for check and set
 914          */
 915         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 916                 $dbw = wfGetDB( DB_MASTER );
 917                 $dbw->startAtomic( __METHOD__ );
 918
 919                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 920                         $dbw->upsert(
 921                                 'redirect',
 922                                 [
 923                                         'rd_from' => $this->getId(),
 924                                         'rd_namespace' => $rt->getNamespace(),
 925                                         'rd_title' => $rt->getDBkey(),
 926                                         'rd_fragment' => $rt->getFragment(),
 927                                         'rd_interwiki' => $rt->getInterwiki(),
 928                                 ],
 929                                 [ 'rd_from' ],
 930                                 [
 931                                         'rd_namespace' => $rt->getNamespace(),
 932                                         'rd_title' => $rt->getDBkey(),
 933                                         'rd_fragment' => $rt->getFragment(),
 934                                         'rd_interwiki' => $rt->getInterwiki(),
 935                                 ],
 936                                 __METHOD__
 937                         );
 938                 }
 939
 940                 $dbw->endAtomic( __METHOD__ );
 941         }
 942
 943         /**
 944          * Get the Title object or URL this page redirects to
 945          *
 946          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 947          */
 948         public function followRedirect() {
 949                 return $this->getRedirectURL( $this->getRedirectTarget() );
 950         }
 951
 952         /**
 953          * Get the Title object or URL to use for a redirect. We use Title
 954          * objects for same-wiki, non-special redirects and URLs for everything
 955          * else.
 956          * @param Title $rt Redirect target
 957          * @return bool|Title|string False, Title object of local target, or string with URL
 958          */
 959         public function getRedirectURL( $rt ) {
 960                 if ( !$rt ) {
 961                         return false;
 962                 }
 963
 964                 if ( $rt->isExternal() ) {
 965                         if ( $rt->isLocal() ) {
 966                                 // Offsite wikis need an HTTP redirect.
 967                                 // This can be hard to reverse and may produce loops,
 968                                 // so they may be disabled in the site configuration.
 969                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 970                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 971                         } else {
 972                                 // External pages without "local" bit set are not valid
 973                                 // redirect targets
 974                                 return false;
 975                         }
 976                 }
 977
 978                 if ( $rt->isSpecialPage() ) {
 979                         // Gotta handle redirects to special pages differently:
 980                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 981                         // Some pages are not valid targets.
 982                         if ( $rt->isValidRedirectTarget() ) {
 983                                 return $rt->getFullURL();
 984                         } else {
 985                                 return false;
 986                         }
 987                 }
 988
 989                 return $rt;
 990         }
 991
 992         /**
 993          * Get a list of users who have edited this article, not including the user who made
 994          * the most recent revision, which you can get from $article->getUser() if you want it
 995          * @return UserArrayFromResult
 996          */
 997         public function getContributors() {
 998                 // @todo FIXME: This is expensive; cache this info somewhere.
 999
1000                 $dbr = wfGetDB( DB_REPLICA );
1001
1002                 if ( $dbr->implicitGroupby() ) {
1003                         $realNameField = 'user_real_name';
1004                 } else {
1005                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1006                 }
1007
1008                 $tables = [ 'revision', 'user' ];
1009
1010                 $fields = [
1011                         'user_id' => 'rev_user',
1012                         'user_name' => 'rev_user_text',
1013                         $realNameField,
1014                         'timestamp' => 'MAX(rev_timestamp)',
1015                 ];
1016
1017                 $conds = [ 'rev_page' => $this->getId() ];
1018
1019                 // The user who made the top revision gets credited as "this page was last edited by
1020                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1021                 $user = $this->getUser();
1022                 if ( $user ) {
1023                         $conds[] = "rev_user != $user";
1024                 } else {
1025                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1026                 }
1027
1028                 // Username hidden?
1029                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1030
1031                 $jconds = [
1032                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1033                 ];
1034
1035                 $options = [
1036                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1037                         'ORDER BY' => 'timestamp DESC',
1038                 ];
1039
1040                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1041                 return new UserArrayFromResult( $res );
1042         }
1043
1044         /**
1045          * Should the parser cache be used?
1046          *
1047          * @param ParserOptions $parserOptions ParserOptions to check
1048          * @param int $oldId
1049          * @return bool
1050          */
1051         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1052                 return $parserOptions->getStubThreshold() == 0
1053                         && $this->exists()
1054                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1055                         && $this->getContentHandler()->isParserCacheSupported();
1056         }
1057
1058         /**
1059          * Get a ParserOutput for the given ParserOptions and revision ID.
1060          *
1061          * The parser cache will be used if possible. Cache misses that result
1062          * in parser runs are debounced with PoolCounter.
1063          *
1064          * @since 1.19
1065          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1066          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1067          *                             get the current revision (default value)
1068          * @param bool          $forceParse Force reindexing, regardless of cache settings
1069          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1070          */
1071         public function getParserOutput(
1072                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1073         ) {
1074                 $useParserCache =
1075                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1076                 wfDebug( __METHOD__ .
1077                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1078                 if ( $parserOptions->getStubThreshold() ) {
1079                         wfIncrStats( 'pcache.miss.stub' );
1080                 }
1081
1082                 if ( $useParserCache ) {
1083                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1084                         if ( $parserOutput !== false ) {
1085                                 return $parserOutput;
1086                         }
1087                 }
1088
1089                 if ( $oldid === null || $oldid === 0 ) {
1090                         $oldid = $this->getLatest();
1091                 }
1092
1093                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1094                 $pool->execute();
1095
1096                 return $pool->getParserOutput();
1097         }
1098
1099         /**
1100          * Do standard deferred updates after page view (existing or missing page)
1101          * @param User $user The relevant user
1102          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1103          */
1104         public function doViewUpdates( User $user, $oldid = 0 ) {
1105                 if ( wfReadOnly() ) {
1106                         return;
1107                 }
1108
1109                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1110                 // Update newtalk / watchlist notification status
1111                 try {
1112                         $user->clearNotification( $this->mTitle, $oldid );
1113                 } catch ( DBError $e ) {
1114                         // Avoid outage if the master is not reachable
1115                         MWExceptionHandler::logException( $e );
1116                 }
1117         }
1118
1119         /**
1120          * Perform the actions of a page purging
1121          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1122          * @return bool
1123          */
1124         public function doPurge( $flags = self::PURGE_ALL ) {
1125                 // Avoid PHP 7.1 warning of passing $this by reference
1126                 $wikiPage = $this;
1127
1128                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1129                         return false;
1130                 }
1131
1132                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1133                         // Set page_touched in the database to invalidate all DC caches
1134                         $this->mTitle->invalidateCache();
1135                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1136                         // Delete the parser options key in the local cluster to invalidate the DC cache
1137                         ParserCache::singleton()->deleteOptionsKey( $this );
1138                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1139                         $cache = ObjectCache::getLocalClusterInstance();
1140                         $cache->set(
1141                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1142                                 wfTimestamp( TS_MW ),
1143                                 $cache::TTL_HOUR
1144                         );
1145                 }
1146
1147                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1148                         // Clear any HTML file cache
1149                         HTMLFileCache::clearFileCache( $this->getTitle() );
1150                         // Send purge after any page_touched above update was committed
1151                         DeferredUpdates::addUpdate(
1152                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1153                                 DeferredUpdates::PRESEND
1154                         );
1155                 }
1156
1157                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1158                         $messageCache = MessageCache::singleton();
1159                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1160                 }
1161
1162                 return true;
1163         }
1164
1165         /**
1166          * Get the last time a user explicitly purged the page via action=purge
1167          *
1168          * @return string|bool TS_MW timestamp or false
1169          * @since 1.28
1170          */
1171         public function getLastPurgeTimestamp() {
1172                 $cache = ObjectCache::getLocalClusterInstance();
1173
1174                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1175         }
1176
1177         /**
1178          * Insert a new empty page record for this article.
1179          * This *must* be followed up by creating a revision
1180          * and running $this->updateRevisionOn( ... );
1181          * or else the record will be left in a funky state.
1182          * Best if all done inside a transaction.
1183          *
1184          * @param IDatabase $dbw
1185          * @param int|null $pageId Custom page ID that will be used for the insert statement
1186          *
1187          * @return bool|int The newly created page_id key; false if the row was not
1188          *   inserted, e.g. because the title already existed or because the specified
1189          *   page ID is already in use.
1190          */
1191         public function insertOn( $dbw, $pageId = null ) {
1192                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1193                 $dbw->insert(
1194                         'page',
1195                         [
1196                                 'page_id'           => $pageIdForInsert,
1197                                 'page_namespace'    => $this->mTitle->getNamespace(),
1198                                 'page_title'        => $this->mTitle->getDBkey(),
1199                                 'page_restrictions' => '',
1200                                 'page_is_redirect'  => 0, // Will set this shortly...
1201                                 'page_is_new'       => 1,
1202                                 'page_random'       => wfRandom(),
1203                                 'page_touched'      => $dbw->timestamp(),
1204                                 'page_latest'       => 0, // Fill this in shortly...
1205                                 'page_len'          => 0, // Fill this in shortly...
1206                         ],
1207                         __METHOD__,
1208                         'IGNORE'
1209                 );
1210
1211                 if ( $dbw->affectedRows() > 0 ) {
1212                         $newid = $pageId ?: $dbw->insertId();
1213                         $this->mId = $newid;
1214                         $this->mTitle->resetArticleID( $newid );
1215
1216                         return $newid;
1217                 } else {
1218                         return false; // nothing changed
1219                 }
1220         }
1221
1222         /**
1223          * Update the page record to point to a newly saved revision.
1224          *
1225          * @param IDatabase $dbw
1226          * @param Revision $revision For ID number, and text used to set
1227          *   length and redirect status fields
1228          * @param int $lastRevision If given, will not overwrite the page field
1229          *   when different from the currently set value.
1230          *   Giving 0 indicates the new page flag should be set on.
1231          * @param bool $lastRevIsRedirect If given, will optimize adding and
1232          *   removing rows in redirect table.
1233          * @return bool Success; false if the page row was missing or page_latest changed
1234          */
1235         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1236                 $lastRevIsRedirect = null
1237         ) {
1238                 global $wgContentHandlerUseDB;
1239
1240                 // Assertion to try to catch T92046
1241                 if ( (int)$revision->getId() === 0 ) {
1242                         throw new InvalidArgumentException(
1243                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1244                         );
1245                 }
1246
1247                 $content = $revision->getContent();
1248                 $len = $content ? $content->getSize() : 0;
1249                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1250
1251                 $conditions = [ 'page_id' => $this->getId() ];
1252
1253                 if ( !is_null( $lastRevision ) ) {
1254                         // An extra check against threads stepping on each other
1255                         $conditions['page_latest'] = $lastRevision;
1256                 }
1257
1258                 $row = [ /* SET */
1259                         'page_latest'      => $revision->getId(),
1260                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1261                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1262                         'page_is_redirect' => $rt !== null ? 1 : 0,
1263                         'page_len'         => $len,
1264                 ];
1265
1266                 if ( $wgContentHandlerUseDB ) {
1267                         $row['page_content_model'] = $revision->getContentModel();
1268                 }
1269
1270                 $dbw->update( 'page',
1271                         $row,
1272                         $conditions,
1273                         __METHOD__ );
1274
1275                 $result = $dbw->affectedRows() > 0;
1276                 if ( $result ) {
1277                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1278                         $this->setLastEdit( $revision );
1279                         $this->mLatest = $revision->getId();
1280                         $this->mIsRedirect = (bool)$rt;
1281                         // Update the LinkCache.
1282                         LinkCache::singleton()->addGoodLinkObj(
1283                                 $this->getId(),
1284                                 $this->mTitle,
1285                                 $len,
1286                                 $this->mIsRedirect,
1287                                 $this->mLatest,
1288                                 $revision->getContentModel()
1289                         );
1290                 }
1291
1292                 return $result;
1293         }
1294
1295         /**
1296          * Add row to the redirect table if this is a redirect, remove otherwise.
1297          *
1298          * @param IDatabase $dbw
1299          * @param Title $redirectTitle Title object pointing to the redirect target,
1300          *   or NULL if this is not a redirect
1301          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1302          *   removing rows in redirect table.
1303          * @return bool True on success, false on failure
1304          * @private
1305          */
1306         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1307                 // Always update redirects (target link might have changed)
1308                 // Update/Insert if we don't know if the last revision was a redirect or not
1309                 // Delete if changing from redirect to non-redirect
1310                 $isRedirect = !is_null( $redirectTitle );
1311
1312                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1313                         return true;
1314                 }
1315
1316                 if ( $isRedirect ) {
1317                         $this->insertRedirectEntry( $redirectTitle );
1318                 } else {
1319                         // This is not a redirect, remove row from redirect table
1320                         $where = [ 'rd_from' => $this->getId() ];
1321                         $dbw->delete( 'redirect', $where, __METHOD__ );
1322                 }
1323
1324                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1325                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1326                 }
1327
1328                 return ( $dbw->affectedRows() != 0 );
1329         }
1330
1331         /**
1332          * If the given revision is newer than the currently set page_latest,
1333          * update the page record. Otherwise, do nothing.
1334          *
1335          * @deprecated since 1.24, use updateRevisionOn instead
1336          *
1337          * @param IDatabase $dbw
1338          * @param Revision $revision
1339          * @return bool
1340          */
1341         public function updateIfNewerOn( $dbw, $revision ) {
1342
1343                 $row = $dbw->selectRow(
1344                         [ 'revision', 'page' ],
1345                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1346                         [
1347                                 'page_id' => $this->getId(),
1348                                 'page_latest=rev_id' ],
1349                         __METHOD__ );
1350
1351                 if ( $row ) {
1352                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1353                                 return false;
1354                         }
1355                         $prev = $row->rev_id;
1356                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1357                 } else {
1358                         // No or missing previous revision; mark the page as new
1359                         $prev = 0;
1360                         $lastRevIsRedirect = null;
1361                 }
1362
1363                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1364
1365                 return $ret;
1366         }
1367
1368         /**
1369          * Get the content that needs to be saved in order to undo all revisions
1370          * between $undo and $undoafter. Revisions must belong to the same page,
1371          * must exist and must not be deleted
1372          * @param Revision $undo
1373          * @param Revision $undoafter Must be an earlier revision than $undo
1374          * @return Content|bool Content on success, false on failure
1375          * @since 1.21
1376          * Before we had the Content object, this was done in getUndoText
1377          */
1378         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1379                 $handler = $undo->getContentHandler();
1380                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1381         }
1382
1383         /**
1384          * Returns true if this page's content model supports sections.
1385          *
1386          * @return bool
1387          *
1388          * @todo The skin should check this and not offer section functionality if
1389          *   sections are not supported.
1390          * @todo The EditPage should check this and not offer section functionality
1391          *   if sections are not supported.
1392          */
1393         public function supportsSections() {
1394                 return $this->getContentHandler()->supportsSections();
1395         }
1396
1397         /**
1398          * @param string|int|null|bool $sectionId Section identifier as a number or string
1399          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1400          * or 'new' for a new section.
1401          * @param Content $sectionContent New content of the section.
1402          * @param string $sectionTitle New section's subject, only if $section is "new".
1403          * @param string $edittime Revision timestamp or null to use the current revision.
1404          *
1405          * @throws MWException
1406          * @return Content|null New complete article content, or null if error.
1407          *
1408          * @since 1.21
1409          * @deprecated since 1.24, use replaceSectionAtRev instead
1410          */
1411         public function replaceSectionContent(
1412                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1413         ) {
1414
1415                 $baseRevId = null;
1416                 if ( $edittime && $sectionId !== 'new' ) {
1417                         $dbr = wfGetDB( DB_REPLICA );
1418                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1419                         // Try the master if this thread may have just added it.
1420                         // This could be abstracted into a Revision method, but we don't want
1421                         // to encourage loading of revisions by timestamp.
1422                         if ( !$rev
1423                                 && wfGetLB()->getServerCount() > 1
1424                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1425                         ) {
1426                                 $dbw = wfGetDB( DB_MASTER );
1427                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1428                         }
1429                         if ( $rev ) {
1430                                 $baseRevId = $rev->getId();
1431                         }
1432                 }
1433
1434                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1435         }
1436
1437         /**
1438          * @param string|int|null|bool $sectionId Section identifier as a number or string
1439          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1440          * or 'new' for a new section.
1441          * @param Content $sectionContent New content of the section.
1442          * @param string $sectionTitle New section's subject, only if $section is "new".
1443          * @param int|null $baseRevId
1444          *
1445          * @throws MWException
1446          * @return Content|null New complete article content, or null if error.
1447          *
1448          * @since 1.24
1449          */
1450         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1451                 $sectionTitle = '', $baseRevId = null
1452         ) {
1453
1454                 if ( strval( $sectionId ) === '' ) {
1455                         // Whole-page edit; let the whole text through
1456                         $newContent = $sectionContent;
1457                 } else {
1458                         if ( !$this->supportsSections() ) {
1459                                 throw new MWException( "sections not supported for content model " .
1460                                         $this->getContentHandler()->getModelID() );
1461                         }
1462
1463                         // Bug 30711: always use current version when adding a new section
1464                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1465                                 $oldContent = $this->getContent();
1466                         } else {
1467                                 $rev = Revision::newFromId( $baseRevId );
1468                                 if ( !$rev ) {
1469                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1470                                                 $this->getId() . "; section: $sectionId)\n" );
1471                                         return null;
1472                                 }
1473
1474                                 $oldContent = $rev->getContent();
1475                         }
1476
1477                         if ( !$oldContent ) {
1478                                 wfDebug( __METHOD__ . ": no page text\n" );
1479                                 return null;
1480                         }
1481
1482                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1483                 }
1484
1485                 return $newContent;
1486         }
1487
1488         /**
1489          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1490          * @param int $flags
1491          * @return int Updated $flags
1492          */
1493         public function checkFlags( $flags ) {
1494                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1495                         if ( $this->exists() ) {
1496                                 $flags |= EDIT_UPDATE;
1497                         } else {
1498                                 $flags |= EDIT_NEW;
1499                         }
1500                 }
1501
1502                 return $flags;
1503         }
1504
1505         /**
1506          * Change an existing article or create a new article. Updates RC and all necessary caches,
1507          * optionally via the deferred update array.
1508          *
1509          * @param Content $content New content
1510          * @param string $summary Edit summary
1511          * @param int $flags Bitfield:
1512          *      EDIT_NEW
1513          *          Article is known or assumed to be non-existent, create a new one
1514          *      EDIT_UPDATE
1515          *          Article is known or assumed to be pre-existing, update it
1516          *      EDIT_MINOR
1517          *          Mark this edit minor, if the user is allowed to do so
1518          *      EDIT_SUPPRESS_RC
1519          *          Do not log the change in recentchanges
1520          *      EDIT_FORCE_BOT
1521          *          Mark the edit a "bot" edit regardless of user rights
1522          *      EDIT_AUTOSUMMARY
1523          *          Fill in blank summaries with generated text where possible
1524          *      EDIT_INTERNAL
1525          *          Signal that the page retrieve/save cycle happened entirely in this request.
1526          *
1527          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1528          * article will be detected. If EDIT_UPDATE is specified and the article
1529          * doesn't exist, the function will return an edit-gone-missing error. If
1530          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1531          * error will be returned. These two conditions are also possible with
1532          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1533          *
1534          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1535          *   This is not the parent revision ID, rather the revision ID for older
1536          *   content used as the source for a rollback, for example.
1537          * @param User $user The user doing the edit
1538          * @param string $serialFormat Format for storing the content in the
1539          *   database.
1540          * @param array|null $tags Change tags to apply to this edit
1541          * Callers are responsible for permission checks
1542          * (with ChangeTags::canAddTagsAccompanyingChange)
1543          * @param Int $undidRevId Id of revision that was undone or 0
1544          *
1545          * @throws MWException
1546          * @return Status Possible errors:
1547          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1548          *       set the fatal flag of $status.
1549          *     edit-gone-missing: In update mode, but the article didn't exist.
1550          *     edit-conflict: In update mode, the article changed unexpectedly.
1551          *     edit-no-change: Warning that the text was the same as before.
1552          *     edit-already-exists: In creation mode, but the article already exists.
1553          *
1554          *  Extensions may define additional errors.
1555          *
1556          *  $return->value will contain an associative array with members as follows:
1557          *     new: Boolean indicating if the function attempted to create a new article.
1558          *     revision: The revision object for the inserted revision, or null.
1559          *
1560          * @since 1.21
1561          * @throws MWException
1562          */
1563         public function doEditContent(
1564                 Content $content, $summary, $flags = 0, $baseRevId = false,
1565                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1566         ) {
1567                 global $wgUser, $wgUseAutomaticEditSummaries;
1568
1569                 // Old default parameter for $tags was null
1570                 if ( $tags === null ) {
1571                         $tags = [];
1572                 }
1573
1574                 // Low-level sanity check
1575                 if ( $this->mTitle->getText() === '' ) {
1576                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1577                 }
1578                 // Make sure the given content type is allowed for this page
1579                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1580                         return Status::newFatal( 'content-not-allowed-here',
1581                                 ContentHandler::getLocalizedName( $content->getModel() ),
1582                                 $this->mTitle->getPrefixedText()
1583                         );
1584                 }
1585
1586                 // Load the data from the master database if needed.
1587                 // The caller may already loaded it from the master or even loaded it using
1588                 // SELECT FOR UPDATE, so do not override that using clear().
1589                 $this->loadPageData( 'fromdbmaster' );
1590
1591                 $user = $user ?: $wgUser;
1592                 $flags = $this->checkFlags( $flags );
1593
1594                 // Avoid PHP 7.1 warning of passing $this by reference
1595                 $wikiPage = $this;
1596
1597                 // Trigger pre-save hook (using provided edit summary)
1598                 $hookStatus = Status::newGood( [] );
1599                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1600                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1601                 // Check if the hook rejected the attempted save
1602                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1603                         if ( $hookStatus->isOK() ) {
1604                                 // Hook returned false but didn't call fatal(); use generic message
1605                                 $hookStatus->fatal( 'edit-hook-aborted' );
1606                         }
1607
1608                         return $hookStatus;
1609                 }
1610
1611                 $old_revision = $this->getRevision(); // current revision
1612                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1613
1614                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1615                         $tags[] = 'mw-contentmodelchange';
1616                 }
1617
1618                 // Provide autosummaries if one is not provided and autosummaries are enabled
1619                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1620                         $handler = $content->getContentHandler();
1621                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1622                 }
1623
1624                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1625                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1626                         $useCache = false;
1627                 } else {
1628                         $useCache = true;
1629                 }
1630
1631                 // Get the pre-save transform content and final parser output
1632                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1633                 $pstContent = $editInfo->pstContent; // Content object
1634                 $meta = [
1635                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1636                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1637                         'serialized' => $editInfo->pst,
1638                         'serialFormat' => $serialFormat,
1639                         'baseRevId' => $baseRevId,
1640                         'oldRevision' => $old_revision,
1641                         'oldContent' => $old_content,
1642                         'oldId' => $this->getLatest(),
1643                         'oldIsRedirect' => $this->isRedirect(),
1644                         'oldCountable' => $this->isCountable(),
1645                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1646                         'undidRevId' => $undidRevId
1647                 ];
1648
1649                 // Actually create the revision and create/update the page
1650                 if ( $flags & EDIT_UPDATE ) {
1651                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1652                 } else {
1653                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1654                 }
1655
1656                 // Promote user to any groups they meet the criteria for
1657                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1658                         $user->addAutopromoteOnceGroups( 'onEdit' );
1659                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1660                 } );
1661
1662                 return $status;
1663         }
1664
1665         /**
1666          * @param Content $content Pre-save transform content
1667          * @param integer $flags
1668          * @param User $user
1669          * @param string $summary
1670          * @param array $meta
1671          * @return Status
1672          * @throws DBUnexpectedError
1673          * @throws Exception
1674          * @throws FatalError
1675          * @throws MWException
1676          */
1677         private function doModify(
1678                 Content $content, $flags, User $user, $summary, array $meta
1679         ) {
1680                 global $wgUseRCPatrol;
1681
1682                 // Update article, but only if changed.
1683                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1684
1685                 // Convenience variables
1686                 $now = wfTimestampNow();
1687                 $oldid = $meta['oldId'];
1688                 /** @var $oldContent Content|null */
1689                 $oldContent = $meta['oldContent'];
1690                 $newsize = $content->getSize();
1691
1692                 if ( !$oldid ) {
1693                         // Article gone missing
1694                         $status->fatal( 'edit-gone-missing' );
1695
1696                         return $status;
1697                 } elseif ( !$oldContent ) {
1698                         // Sanity check for bug 37225
1699                         throw new MWException( "Could not find text for current revision {$oldid}." );
1700                 }
1701
1702                 // @TODO: pass content object?!
1703                 $revision = new Revision( [
1704                         'page'       => $this->getId(),
1705                         'title'      => $this->mTitle, // for determining the default content model
1706                         'comment'    => $summary,
1707                         'minor_edit' => $meta['minor'],
1708                         'text'       => $meta['serialized'],
1709                         'len'        => $newsize,
1710                         'parent_id'  => $oldid,
1711                         'user'       => $user->getId(),
1712                         'user_text'  => $user->getName(),
1713                         'timestamp'  => $now,
1714                         'content_model' => $content->getModel(),
1715                         'content_format' => $meta['serialFormat'],
1716                 ] );
1717
1718                 $changed = !$content->equals( $oldContent );
1719
1720                 $dbw = wfGetDB( DB_MASTER );
1721
1722                 if ( $changed ) {
1723                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1724                         $status->merge( $prepStatus );
1725                         if ( !$status->isOK() ) {
1726                                 return $status;
1727                         }
1728
1729                         $dbw->startAtomic( __METHOD__ );
1730                         // Get the latest page_latest value while locking it.
1731                         // Do a CAS style check to see if it's the same as when this method
1732                         // started. If it changed then bail out before touching the DB.
1733                         $latestNow = $this->lockAndGetLatest();
1734                         if ( $latestNow != $oldid ) {
1735                                 $dbw->endAtomic( __METHOD__ );
1736                                 // Page updated or deleted in the mean time
1737                                 $status->fatal( 'edit-conflict' );
1738
1739                                 return $status;
1740                         }
1741
1742                         // At this point we are now comitted to returning an OK
1743                         // status unless some DB query error or other exception comes up.
1744                         // This way callers don't have to call rollback() if $status is bad
1745                         // unless they actually try to catch exceptions (which is rare).
1746
1747                         // Save the revision text
1748                         $revisionId = $revision->insertOn( $dbw );
1749                         // Update page_latest and friends to reflect the new revision
1750                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1751                                 throw new MWException( "Failed to update page row to use new revision." );
1752                         }
1753
1754                         $tags = $meta['tags'];
1755                         Hooks::run( 'NewRevisionFromEditComplete',
1756                                 [ $this, $revision, $meta['baseRevId'], $user, &$tags ] );
1757
1758                         // Update recentchanges
1759                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1760                                 // Mark as patrolled if the user can do so
1761                                 $patrolled = $wgUseRCPatrol && !count(
1762                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1763                                 // Add RC row to the DB
1764                                 RecentChange::notifyEdit(
1765                                         $now,
1766                                         $this->mTitle,
1767                                         $revision->isMinor(),
1768                                         $user,
1769                                         $summary,
1770                                         $oldid,
1771                                         $this->getTimestamp(),
1772                                         $meta['bot'],
1773                                         '',
1774                                         $oldContent ? $oldContent->getSize() : 0,
1775                                         $newsize,
1776                                         $revisionId,
1777                                         $patrolled,
1778                                         $tags
1779                                 );
1780                         }
1781
1782                         $user->incEditCount();
1783
1784                         $dbw->endAtomic( __METHOD__ );
1785                         $this->mTimestamp = $now;
1786                 } else {
1787                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1788                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1789                         $revision->setId( $this->getLatest() );
1790                         $revision->setUserIdAndName(
1791                                 $this->getUser( Revision::RAW ),
1792                                 $this->getUserText( Revision::RAW )
1793                         );
1794                 }
1795
1796                 if ( $changed ) {
1797                         // Return the new revision to the caller
1798                         $status->value['revision'] = $revision;
1799                 } else {
1800                         $status->warning( 'edit-no-change' );
1801                         // Update page_touched as updateRevisionOn() was not called.
1802                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1803                         $this->mTitle->invalidateCache( $now );
1804                 }
1805
1806                 // Do secondary updates once the main changes have been committed...
1807                 DeferredUpdates::addUpdate(
1808                         new AtomicSectionUpdate(
1809                                 $dbw,
1810                                 __METHOD__,
1811                                 function () use (
1812                                         $revision, &$user, $content, $summary, &$flags,
1813                                         $changed, $meta, &$status
1814                                 ) {
1815                                         // Update links tables, site stats, etc.
1816                                         $this->doEditUpdates(
1817                                                 $revision,
1818                                                 $user,
1819                                                 [
1820                                                         'changed' => $changed,
1821                                                         'oldcountable' => $meta['oldCountable'],
1822                                                         'oldrevision' => $meta['oldRevision']
1823                                                 ]
1824                                         );
1825                                         // Avoid PHP 7.1 warning of passing $this by reference
1826                                         $wikiPage = $this;
1827                                         // Trigger post-save hook
1828                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1829                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1830                                                 $meta['undidRevId'] ];
1831                                         Hooks::run( 'PageContentSaveComplete', $params );
1832                                 }
1833                         ),
1834                         DeferredUpdates::PRESEND
1835                 );
1836
1837                 return $status;
1838         }
1839
1840         /**
1841          * @param Content $content Pre-save transform content
1842          * @param integer $flags
1843          * @param User $user
1844          * @param string $summary
1845          * @param array $meta
1846          * @return Status
1847          * @throws DBUnexpectedError
1848          * @throws Exception
1849          * @throws FatalError
1850          * @throws MWException
1851          */
1852         private function doCreate(
1853                 Content $content, $flags, User $user, $summary, array $meta
1854         ) {
1855                 global $wgUseRCPatrol, $wgUseNPPatrol;
1856
1857                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1858
1859                 $now = wfTimestampNow();
1860                 $newsize = $content->getSize();
1861                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1862                 $status->merge( $prepStatus );
1863                 if ( !$status->isOK() ) {
1864                         return $status;
1865                 }
1866
1867                 $dbw = wfGetDB( DB_MASTER );
1868                 $dbw->startAtomic( __METHOD__ );
1869
1870                 // Add the page record unless one already exists for the title
1871                 $newid = $this->insertOn( $dbw );
1872                 if ( $newid === false ) {
1873                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1874                         $status->fatal( 'edit-already-exists' );
1875
1876                         return $status; // nothing done
1877                 }
1878
1879                 // At this point we are now comitted to returning an OK
1880                 // status unless some DB query error or other exception comes up.
1881                 // This way callers don't have to call rollback() if $status is bad
1882                 // unless they actually try to catch exceptions (which is rare).
1883
1884                 // @TODO: pass content object?!
1885                 $revision = new Revision( [
1886                         'page'       => $newid,
1887                         'title'      => $this->mTitle, // for determining the default content model
1888                         'comment'    => $summary,
1889                         'minor_edit' => $meta['minor'],
1890                         'text'       => $meta['serialized'],
1891                         'len'        => $newsize,
1892                         'user'       => $user->getId(),
1893                         'user_text'  => $user->getName(),
1894                         'timestamp'  => $now,
1895                         'content_model' => $content->getModel(),
1896                         'content_format' => $meta['serialFormat'],
1897                 ] );
1898
1899                 // Save the revision text...
1900                 $revisionId = $revision->insertOn( $dbw );
1901                 // Update the page record with revision data
1902                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1903                         throw new MWException( "Failed to update page row to use new revision." );
1904                 }
1905
1906                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1907
1908                 // Update recentchanges
1909                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1910                         // Mark as patrolled if the user can do so
1911                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1912                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1913                         // Add RC row to the DB
1914                         RecentChange::notifyNew(
1915                                 $now,
1916                                 $this->mTitle,
1917                                 $revision->isMinor(),
1918                                 $user,
1919                                 $summary,
1920                                 $meta['bot'],
1921                                 '',
1922                                 $newsize,
1923                                 $revisionId,
1924                                 $patrolled,
1925                                 $meta['tags']
1926                         );
1927                 }
1928
1929                 $user->incEditCount();
1930
1931                 $dbw->endAtomic( __METHOD__ );
1932                 $this->mTimestamp = $now;
1933
1934                 // Return the new revision to the caller
1935                 $status->value['revision'] = $revision;
1936
1937                 // Do secondary updates once the main changes have been committed...
1938                 DeferredUpdates::addUpdate(
1939                         new AtomicSectionUpdate(
1940                                 $dbw,
1941                                 __METHOD__,
1942                                 function () use (
1943                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1944                                 ) {
1945                                         // Update links, etc.
1946                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1947                                         // Avoid PHP 7.1 warning of passing $this by reference
1948                                         $wikiPage = $this;
1949                                         // Trigger post-create hook
1950                                         $params = [ &$wikiPage, &$user, $content, $summary,
1951                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1952                                         Hooks::run( 'PageContentInsertComplete', $params );
1953                                         // Trigger post-save hook
1954                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
1955                                         Hooks::run( 'PageContentSaveComplete', $params );
1956                                 }
1957                         ),
1958                         DeferredUpdates::PRESEND
1959                 );
1960
1961                 return $status;
1962         }
1963
1964         /**
1965          * Get parser options suitable for rendering the primary article wikitext
1966          *
1967          * @see ContentHandler::makeParserOptions
1968          *
1969          * @param IContextSource|User|string $context One of the following:
1970          *        - IContextSource: Use the User and the Language of the provided
1971          *          context
1972          *        - User: Use the provided User object and $wgLang for the language,
1973          *          so use an IContextSource object if possible.
1974          *        - 'canonical': Canonical options (anonymous user with default
1975          *          preferences and content language).
1976          * @return ParserOptions
1977          */
1978         public function makeParserOptions( $context ) {
1979                 $options = $this->getContentHandler()->makeParserOptions( $context );
1980
1981                 if ( $this->getTitle()->isConversionTable() ) {
1982                         // @todo ConversionTable should become a separate content model, so
1983                         // we don't need special cases like this one.
1984                         $options->disableContentConversion();
1985                 }
1986
1987                 return $options;
1988         }
1989
1990         /**
1991          * Prepare content which is about to be saved.
1992          * Returns a stdClass with source, pst and output members
1993          *
1994          * @param Content $content
1995          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
1996          *        revision ID is also accepted, but this is deprecated.
1997          * @param User|null $user
1998          * @param string|null $serialFormat
1999          * @param bool $useCache Check shared prepared edit cache
2000          *
2001          * @return object
2002          *
2003          * @since 1.21
2004          */
2005         public function prepareContentForEdit(
2006                 Content $content, $revision = null, User $user = null,
2007                 $serialFormat = null, $useCache = true
2008         ) {
2009                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2010
2011                 if ( is_object( $revision ) ) {
2012                         $revid = $revision->getId();
2013                 } else {
2014                         $revid = $revision;
2015                         // This code path is deprecated, and nothing is known to
2016                         // use it, so performance here shouldn't be a worry.
2017                         if ( $revid !== null ) {
2018                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2019                         } else {
2020                                 $revision = null;
2021                         }
2022                 }
2023
2024                 $user = is_null( $user ) ? $wgUser : $user;
2025                 // XXX: check $user->getId() here???
2026
2027                 // Use a sane default for $serialFormat, see bug 57026
2028                 if ( $serialFormat === null ) {
2029                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2030                 }
2031
2032                 if ( $this->mPreparedEdit
2033                         && isset( $this->mPreparedEdit->newContent )
2034                         && $this->mPreparedEdit->newContent->equals( $content )
2035                         && $this->mPreparedEdit->revid == $revid
2036                         && $this->mPreparedEdit->format == $serialFormat
2037                         // XXX: also check $user here?
2038                 ) {
2039                         // Already prepared
2040                         return $this->mPreparedEdit;
2041                 }
2042
2043                 // The edit may have already been prepared via api.php?action=stashedit
2044                 $cachedEdit = $useCache && $wgAjaxEditStash
2045                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2046                         : false;
2047
2048                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2049                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2050
2051                 $edit = (object)[];
2052                 if ( $cachedEdit ) {
2053                         $edit->timestamp = $cachedEdit->timestamp;
2054                 } else {
2055                         $edit->timestamp = wfTimestampNow();
2056                 }
2057                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2058                 $edit->revid = $revid;
2059
2060                 if ( $cachedEdit ) {
2061                         $edit->pstContent = $cachedEdit->pstContent;
2062                 } else {
2063                         $edit->pstContent = $content
2064                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2065                                 : null;
2066                 }
2067
2068                 $edit->format = $serialFormat;
2069                 $edit->popts = $this->makeParserOptions( 'canonical' );
2070                 if ( $cachedEdit ) {
2071                         $edit->output = $cachedEdit->output;
2072                 } else {
2073                         if ( $revision ) {
2074                                 // We get here if vary-revision is set. This means that this page references
2075                                 // itself (such as via self-transclusion). In this case, we need to make sure
2076                                 // that any such self-references refer to the newly-saved revision, and not
2077                                 // to the previous one, which could otherwise happen due to replica DB lag.
2078                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2079                                 $edit->popts->setCurrentRevisionCallback(
2080                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2081                                                 if ( $title->equals( $revision->getTitle() ) ) {
2082                                                         return $revision;
2083                                                 } else {
2084                                                         return call_user_func( $oldCallback, $title, $parser );
2085                                                 }
2086                                         }
2087                                 );
2088                         } else {
2089                                 // Try to avoid a second parse if {{REVISIONID}} is used
2090                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2091                                         ? DB_MASTER // use the best possible guess
2092                                         : DB_REPLICA; // T154554
2093
2094                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2095                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2096                                                 'revision',
2097                                                 'MAX(rev_id)',
2098                                                 [],
2099                                                 __METHOD__
2100                                         );
2101                                 } );
2102                         }
2103                         $edit->output = $edit->pstContent
2104                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2105                                 : null;
2106                 }
2107
2108                 $edit->newContent = $content;
2109                 $edit->oldContent = $this->getContent( Revision::RAW );
2110
2111                 // NOTE: B/C for hooks! don't use these fields!
2112                 $edit->newText = $edit->newContent
2113                         ? ContentHandler::getContentText( $edit->newContent )
2114                         : '';
2115                 $edit->oldText = $edit->oldContent
2116                         ? ContentHandler::getContentText( $edit->oldContent )
2117                         : '';
2118                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2119
2120                 if ( $edit->output ) {
2121                         $edit->output->setCacheTime( wfTimestampNow() );
2122                 }
2123
2124                 // Process cache the result
2125                 $this->mPreparedEdit = $edit;
2126
2127                 return $edit;
2128         }
2129
2130         /**
2131          * Do standard deferred updates after page edit.
2132          * Update links tables, site stats, search index and message cache.
2133          * Purges pages that include this page if the text was changed here.
2134          * Every 100th edit, prune the recent changes table.
2135          *
2136          * @param Revision $revision
2137          * @param User $user User object that did the revision
2138          * @param array $options Array of options, following indexes are used:
2139          * - changed: boolean, whether the revision changed the content (default true)
2140          * - created: boolean, whether the revision created the page (default false)
2141          * - moved: boolean, whether the page was moved (default false)
2142          * - restored: boolean, whether the page was undeleted (default false)
2143          * - oldrevision: Revision object for the pre-update revision (default null)
2144          * - oldcountable: boolean, null, or string 'no-change' (default null):
2145          *   - boolean: whether the page was counted as an article before that
2146          *     revision, only used in changed is true and created is false
2147          *   - null: if created is false, don't update the article count; if created
2148          *     is true, do update the article count
2149          *   - 'no-change': don't update the article count, ever
2150          */
2151         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2152                 global $wgRCWatchCategoryMembership;
2153
2154                 $options += [
2155                         'changed' => true,
2156                         'created' => false,
2157                         'moved' => false,
2158                         'restored' => false,
2159                         'oldrevision' => null,
2160                         'oldcountable' => null
2161                 ];
2162                 $content = $revision->getContent();
2163
2164                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2165
2166                 // See if the parser output before $revision was inserted is still valid
2167                 $editInfo = false;
2168                 if ( !$this->mPreparedEdit ) {
2169                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2170                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2171                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2172                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2173                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2174                 ) {
2175                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2176                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2177                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2178                 } else {
2179                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2180                         $editInfo = $this->mPreparedEdit;
2181                 }
2182
2183                 if ( !$editInfo ) {
2184                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2185                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2186                         // as any prepared content from there or in doEditContent() was already rejected.
2187                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2188                 }
2189
2190                 // Save it to the parser cache.
2191                 // Make sure the cache time matches page_touched to avoid double parsing.
2192                 ParserCache::singleton()->save(
2193                         $editInfo->output, $this, $editInfo->popts,
2194                         $revision->getTimestamp(), $editInfo->revid
2195                 );
2196
2197                 // Update the links tables and other secondary data
2198                 if ( $content ) {
2199                         $recursive = $options['changed']; // bug 50785
2200                         $updates = $content->getSecondaryDataUpdates(
2201                                 $this->getTitle(), null, $recursive, $editInfo->output
2202                         );
2203                         foreach ( $updates as $update ) {
2204                                 if ( $update instanceof LinksUpdate ) {
2205                                         $update->setRevision( $revision );
2206                                         $update->setTriggeringUser( $user );
2207                                 }
2208                                 DeferredUpdates::addUpdate( $update );
2209                         }
2210                         if ( $wgRCWatchCategoryMembership
2211                                 && $this->getContentHandler()->supportsCategories() === true
2212                                 && ( $options['changed'] || $options['created'] )
2213                                 && !$options['restored']
2214                         ) {
2215                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2216                                 // the recent change entry (also done via deferred updates) and carry over any
2217                                 // bot/deletion/IP flags, ect.
2218                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2219                                         $this->getTitle(),
2220                                         [
2221                                                 'pageId' => $this->getId(),
2222                                                 'revTimestamp' => $revision->getTimestamp()
2223                                         ]
2224                                 ) );
2225                         }
2226                 }
2227
2228                 // Avoid PHP 7.1 warning of passing $this by reference
2229                 $wikiPage = $this;
2230
2231                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2232
2233                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2234                         // Flush old entries from the `recentchanges` table
2235                         if ( mt_rand( 0, 9 ) == 0 ) {
2236                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2237                         }
2238                 }
2239
2240                 if ( !$this->exists() ) {
2241                         return;
2242                 }
2243
2244                 $id = $this->getId();
2245                 $title = $this->mTitle->getPrefixedDBkey();
2246                 $shortTitle = $this->mTitle->getDBkey();
2247
2248                 if ( $options['oldcountable'] === 'no-change' ||
2249                         ( !$options['changed'] && !$options['moved'] )
2250                 ) {
2251                         $good = 0;
2252                 } elseif ( $options['created'] ) {
2253                         $good = (int)$this->isCountable( $editInfo );
2254                 } elseif ( $options['oldcountable'] !== null ) {
2255                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2256                 } else {
2257                         $good = 0;
2258                 }
2259                 $edits = $options['changed'] ? 1 : 0;
2260                 $total = $options['created'] ? 1 : 0;
2261
2262                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2263                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2264
2265                 // If this is another user's talk page, update newtalk.
2266                 // Don't do this if $options['changed'] = false (null-edits) nor if
2267                 // it's a minor edit and the user doesn't want notifications for those.
2268                 if ( $options['changed']
2269                         && $this->mTitle->getNamespace() == NS_USER_TALK
2270                         && $shortTitle != $user->getTitleKey()
2271                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2272                 ) {
2273                         $recipient = User::newFromName( $shortTitle, false );
2274                         if ( !$recipient ) {
2275                                 wfDebug( __METHOD__ . ": invalid username\n" );
2276                         } else {
2277                                 // Avoid PHP 7.1 warning of passing $this by reference
2278                                 $wikiPage = $this;
2279
2280                                 // Allow extensions to prevent user notification
2281                                 // when a new message is added to their talk page
2282                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2283                                         if ( User::isIP( $shortTitle ) ) {
2284                                                 // An anonymous user
2285                                                 $recipient->setNewtalk( true, $revision );
2286                                         } elseif ( $recipient->isLoggedIn() ) {
2287                                                 $recipient->setNewtalk( true, $revision );
2288                                         } else {
2289                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2290                                         }
2291                                 }
2292                         }
2293                 }
2294
2295                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2296                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2297                 }
2298
2299                 if ( $options['created'] ) {
2300                         self::onArticleCreate( $this->mTitle );
2301                 } elseif ( $options['changed'] ) { // bug 50785
2302                         self::onArticleEdit( $this->mTitle, $revision );
2303                 }
2304
2305                 ResourceLoaderWikiModule::invalidateModuleCache(
2306                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2307                 );
2308         }
2309
2310         /**
2311          * Update the article's restriction field, and leave a log entry.
2312          * This works for protection both existing and non-existing pages.
2313          *
2314          * @param array $limit Set of restriction keys
2315          * @param array $expiry Per restriction type expiration
2316          * @param int &$cascade Set to false if cascading protection isn't allowed.
2317          * @param string $reason
2318          * @param User $user The user updating the restrictions
2319          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2320          *   ($user should be able to add the specified tags before this is called)
2321          * @return Status Status object; if action is taken, $status->value is the log_id of the
2322          *   protection log entry.
2323          */
2324         public function doUpdateRestrictions( array $limit, array $expiry,
2325                 &$cascade, $reason, User $user, $tags = null
2326         ) {
2327                 global $wgCascadingRestrictionLevels, $wgContLang;
2328
2329                 if ( wfReadOnly() ) {
2330                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2331                 }
2332
2333                 $this->loadPageData( 'fromdbmaster' );
2334                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2335                 $id = $this->getId();
2336
2337                 if ( !$cascade ) {
2338                         $cascade = false;
2339                 }
2340
2341                 // Take this opportunity to purge out expired restrictions
2342                 Title::purgeExpiredRestrictions();
2343
2344                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2345                 // we expect a single selection, but the schema allows otherwise.
2346                 $isProtected = false;
2347                 $protect = false;
2348                 $changed = false;
2349
2350                 $dbw = wfGetDB( DB_MASTER );
2351
2352                 foreach ( $restrictionTypes as $action ) {
2353                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2354                                 $expiry[$action] = 'infinity';
2355                         }
2356                         if ( !isset( $limit[$action] ) ) {
2357                                 $limit[$action] = '';
2358                         } elseif ( $limit[$action] != '' ) {
2359                                 $protect = true;
2360                         }
2361
2362                         // Get current restrictions on $action
2363                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2364                         if ( $current != '' ) {
2365                                 $isProtected = true;
2366                         }
2367
2368                         if ( $limit[$action] != $current ) {
2369                                 $changed = true;
2370                         } elseif ( $limit[$action] != '' ) {
2371                                 // Only check expiry change if the action is actually being
2372                                 // protected, since expiry does nothing on an not-protected
2373                                 // action.
2374                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2375                                         $changed = true;
2376                                 }
2377                         }
2378                 }
2379
2380                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2381                         $changed = true;
2382                 }
2383
2384                 // If nothing has changed, do nothing
2385                 if ( !$changed ) {
2386                         return Status::newGood();
2387                 }
2388
2389                 if ( !$protect ) { // No protection at all means unprotection
2390                         $revCommentMsg = 'unprotectedarticle-comment';
2391                         $logAction = 'unprotect';
2392                 } elseif ( $isProtected ) {
2393                         $revCommentMsg = 'modifiedarticleprotection-comment';
2394                         $logAction = 'modify';
2395                 } else {
2396                         $revCommentMsg = 'protectedarticle-comment';
2397                         $logAction = 'protect';
2398                 }
2399
2400                 // Truncate for whole multibyte characters
2401                 $reason = $wgContLang->truncate( $reason, 255 );
2402
2403                 $logRelationsValues = [];
2404                 $logRelationsField = null;
2405                 $logParamsDetails = [];
2406
2407                 // Null revision (used for change tag insertion)
2408                 $nullRevision = null;
2409
2410                 if ( $id ) { // Protection of existing page
2411                         // Avoid PHP 7.1 warning of passing $this by reference
2412                         $wikiPage = $this;
2413
2414                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2415                                 return Status::newGood();
2416                         }
2417
2418                         // Only certain restrictions can cascade...
2419                         $editrestriction = isset( $limit['edit'] )
2420                                 ? [ $limit['edit'] ]
2421                                 : $this->mTitle->getRestrictions( 'edit' );
2422                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2423                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2424                         }
2425                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2426                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2427                         }
2428
2429                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2430                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2431                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2432                         }
2433                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2434                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2435                         }
2436
2437                         // The schema allows multiple restrictions
2438                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2439                                 $cascade = false;
2440                         }
2441
2442                         // insert null revision to identify the page protection change as edit summary
2443                         $latest = $this->getLatest();
2444                         $nullRevision = $this->insertProtectNullRevision(
2445                                 $revCommentMsg,
2446                                 $limit,
2447                                 $expiry,
2448                                 $cascade,
2449                                 $reason,
2450                                 $user
2451                         );
2452
2453                         if ( $nullRevision === null ) {
2454                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2455                         }
2456
2457                         $logRelationsField = 'pr_id';
2458
2459                         // Update restrictions table
2460                         foreach ( $limit as $action => $restrictions ) {
2461                                 $dbw->delete(
2462                                         'page_restrictions',
2463                                         [
2464                                                 'pr_page' => $id,
2465                                                 'pr_type' => $action
2466                                         ],
2467                                         __METHOD__
2468                                 );
2469                                 if ( $restrictions != '' ) {
2470                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2471                                         $dbw->insert(
2472                                                 'page_restrictions',
2473                                                 [
2474                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2475                                                         'pr_page' => $id,
2476                                                         'pr_type' => $action,
2477                                                         'pr_level' => $restrictions,
2478                                                         'pr_cascade' => $cascadeValue,
2479                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2480                                                 ],
2481                                                 __METHOD__
2482                                         );
2483                                         $logRelationsValues[] = $dbw->insertId();
2484                                         $logParamsDetails[] = [
2485                                                 'type' => $action,
2486                                                 'level' => $restrictions,
2487                                                 'expiry' => $expiry[$action],
2488                                                 'cascade' => (bool)$cascadeValue,
2489                                         ];
2490                                 }
2491                         }
2492
2493                         // Clear out legacy restriction fields
2494                         $dbw->update(
2495                                 'page',
2496                                 [ 'page_restrictions' => '' ],
2497                                 [ 'page_id' => $id ],
2498                                 __METHOD__
2499                         );
2500
2501                         // Avoid PHP 7.1 warning of passing $this by reference
2502                         $wikiPage = $this;
2503
2504                         Hooks::run( 'NewRevisionFromEditComplete',
2505                                 [ $this, $nullRevision, $latest, $user ] );
2506                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2507                 } else { // Protection of non-existing page (also known as "title protection")
2508                         // Cascade protection is meaningless in this case
2509                         $cascade = false;
2510
2511                         if ( $limit['create'] != '' ) {
2512                                 $dbw->replace( 'protected_titles',
2513                                         [ [ 'pt_namespace', 'pt_title' ] ],
2514                                         [
2515                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2516                                                 'pt_title' => $this->mTitle->getDBkey(),
2517                                                 'pt_create_perm' => $limit['create'],
2518                                                 'pt_timestamp' => $dbw->timestamp(),
2519                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2520                                                 'pt_user' => $user->getId(),
2521                                                 'pt_reason' => $reason,
2522                                         ], __METHOD__
2523                                 );
2524                                 $logParamsDetails[] = [
2525                                         'type' => 'create',
2526                                         'level' => $limit['create'],
2527                                         'expiry' => $expiry['create'],
2528                                 ];
2529                         } else {
2530                                 $dbw->delete( 'protected_titles',
2531                                         [
2532                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2533                                                 'pt_title' => $this->mTitle->getDBkey()
2534                                         ], __METHOD__
2535                                 );
2536                         }
2537                 }
2538
2539                 $this->mTitle->flushRestrictions();
2540                 InfoAction::invalidateCache( $this->mTitle );
2541
2542                 if ( $logAction == 'unprotect' ) {
2543                         $params = [];
2544                 } else {
2545                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2546                         $params = [
2547                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2548                                 '5:bool:cascade' => $cascade,
2549                                 'details' => $logParamsDetails, // parameter for localize and api
2550                         ];
2551                 }
2552
2553                 // Update the protection log
2554                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2555                 $logEntry->setTarget( $this->mTitle );
2556                 $logEntry->setComment( $reason );
2557                 $logEntry->setPerformer( $user );
2558                 $logEntry->setParameters( $params );
2559                 if ( !is_null( $nullRevision ) ) {
2560                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2561                 }
2562                 $logEntry->setTags( $tags );
2563                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2564                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2565                 }
2566                 $logId = $logEntry->insert();
2567                 $logEntry->publish( $logId );
2568
2569                 return Status::newGood( $logId );
2570         }
2571
2572         /**
2573          * Insert a new null revision for this page.
2574          *
2575          * @param string $revCommentMsg Comment message key for the revision
2576          * @param array $limit Set of restriction keys
2577          * @param array $expiry Per restriction type expiration
2578          * @param int $cascade Set to false if cascading protection isn't allowed.
2579          * @param string $reason
2580          * @param User|null $user
2581          * @return Revision|null Null on error
2582          */
2583         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2584                 array $expiry, $cascade, $reason, $user = null
2585         ) {
2586                 $dbw = wfGetDB( DB_MASTER );
2587
2588                 // Prepare a null revision to be added to the history
2589                 $editComment = wfMessage(
2590                         $revCommentMsg,
2591                         $this->mTitle->getPrefixedText(),
2592                         $user ? $user->getName() : ''
2593                 )->inContentLanguage()->text();
2594                 if ( $reason ) {
2595                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2596                 }
2597                 $protectDescription = $this->protectDescription( $limit, $expiry );
2598                 if ( $protectDescription ) {
2599                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2600                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2601                                 ->inContentLanguage()->text();
2602                 }
2603                 if ( $cascade ) {
2604                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2605                         $editComment .= wfMessage( 'brackets' )->params(
2606                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2607                         )->inContentLanguage()->text();
2608                 }
2609
2610                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2611                 if ( $nullRev ) {
2612                         $nullRev->insertOn( $dbw );
2613
2614                         // Update page record and touch page
2615                         $oldLatest = $nullRev->getParentId();
2616                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2617                 }
2618
2619                 return $nullRev;
2620         }
2621
2622         /**
2623          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2624          * @return string
2625          */
2626         protected function formatExpiry( $expiry ) {
2627                 global $wgContLang;
2628
2629                 if ( $expiry != 'infinity' ) {
2630                         return wfMessage(
2631                                 'protect-expiring',
2632                                 $wgContLang->timeanddate( $expiry, false, false ),
2633                                 $wgContLang->date( $expiry, false, false ),
2634                                 $wgContLang->time( $expiry, false, false )
2635                         )->inContentLanguage()->text();
2636                 } else {
2637                         return wfMessage( 'protect-expiry-indefinite' )
2638                                 ->inContentLanguage()->text();
2639                 }
2640         }
2641
2642         /**
2643          * Builds the description to serve as comment for the edit.
2644          *
2645          * @param array $limit Set of restriction keys
2646          * @param array $expiry Per restriction type expiration
2647          * @return string
2648          */
2649         public function protectDescription( array $limit, array $expiry ) {
2650                 $protectDescription = '';
2651
2652                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2653                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2654                         # All possible message keys are listed here for easier grepping:
2655                         # * restriction-create
2656                         # * restriction-edit
2657                         # * restriction-move
2658                         # * restriction-upload
2659                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2660                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2661                         # with '' filtered out. All possible message keys are listed below:
2662                         # * protect-level-autoconfirmed
2663                         # * protect-level-sysop
2664                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2665                                 ->inContentLanguage()->text();
2666
2667                         $expiryText = $this->formatExpiry( $expiry[$action] );
2668
2669                         if ( $protectDescription !== '' ) {
2670                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2671                         }
2672                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2673                                 ->params( $actionText, $restrictionsText, $expiryText )
2674                                 ->inContentLanguage()->text();
2675                 }
2676
2677                 return $protectDescription;
2678         }
2679
2680         /**
2681          * Builds the description to serve as comment for the log entry.
2682          *
2683          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2684          * protect description text. Keep them in old format to avoid breaking compatibility.
2685          * TODO: Fix protection log to store structured description and format it on-the-fly.
2686          *
2687          * @param array $limit Set of restriction keys
2688          * @param array $expiry Per restriction type expiration
2689          * @return string
2690          */
2691         public function protectDescriptionLog( array $limit, array $expiry ) {
2692                 global $wgContLang;
2693
2694                 $protectDescriptionLog = '';
2695
2696                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2697                         $expiryText = $this->formatExpiry( $expiry[$action] );
2698                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2699                                 "[$action=$restrictions] ($expiryText)";
2700                 }
2701
2702                 return trim( $protectDescriptionLog );
2703         }
2704
2705         /**
2706          * Take an array of page restrictions and flatten it to a string
2707          * suitable for insertion into the page_restrictions field.
2708          *
2709          * @param string[] $limit
2710          *
2711          * @throws MWException
2712          * @return string
2713          */
2714         protected static function flattenRestrictions( $limit ) {
2715                 if ( !is_array( $limit ) ) {
2716                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2717                 }
2718
2719                 $bits = [];
2720                 ksort( $limit );
2721
2722                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2723                         $bits[] = "$action=$restrictions";
2724                 }
2725
2726                 return implode( ':', $bits );
2727         }
2728
2729         /**
2730          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2731          * backwards compatibility, if you care about error reporting you should use
2732          * doDeleteArticleReal() instead.
2733          *
2734          * Deletes the article with database consistency, writes logs, purges caches
2735          *
2736          * @param string $reason Delete reason for deletion log
2737          * @param bool $suppress Suppress all revisions and log the deletion in
2738          *        the suppression log instead of the deletion log
2739          * @param int $u1 Unused
2740          * @param bool $u2 Unused
2741          * @param array|string &$error Array of errors to append to
2742          * @param User $user The deleting user
2743          * @return bool True if successful
2744          */
2745         public function doDeleteArticle(
2746                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2747         ) {
2748                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2749                 return $status->isGood();
2750         }
2751
2752         /**
2753          * Back-end article deletion
2754          * Deletes the article with database consistency, writes logs, purges caches
2755          *
2756          * @since 1.19
2757          *
2758          * @param string $reason Delete reason for deletion log
2759          * @param bool $suppress Suppress all revisions and log the deletion in
2760          *   the suppression log instead of the deletion log
2761          * @param int $u1 Unused
2762          * @param bool $u2 Unused
2763          * @param array|string &$error Array of errors to append to
2764          * @param User $user The deleting user
2765          * @param array $tags Tags to apply to the deletion action
2766          * @return Status Status object; if successful, $status->value is the log_id of the
2767          *   deletion log entry. If the page couldn't be deleted because it wasn't
2768          *   found, $status is a non-fatal 'cannotdelete' error
2769          */
2770         public function doDeleteArticleReal(
2771                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2772                 $tags = [], $logsubtype = 'delete'
2773         ) {
2774                 global $wgUser, $wgContentHandlerUseDB;
2775
2776                 wfDebug( __METHOD__ . "\n" );
2777
2778                 $status = Status::newGood();
2779
2780                 if ( $this->mTitle->getDBkey() === '' ) {
2781                         $status->error( 'cannotdelete',
2782                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2783                         return $status;
2784                 }
2785
2786                 // Avoid PHP 7.1 warning of passing $this by reference
2787                 $wikiPage = $this;
2788
2789                 $user = is_null( $user ) ? $wgUser : $user;
2790                 if ( !Hooks::run( 'ArticleDelete',
2791                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2792                 ) ) {
2793                         if ( $status->isOK() ) {
2794                                 // Hook aborted but didn't set a fatal status
2795                                 $status->fatal( 'delete-hook-aborted' );
2796                         }
2797                         return $status;
2798                 }
2799
2800                 $dbw = wfGetDB( DB_MASTER );
2801                 $dbw->startAtomic( __METHOD__ );
2802
2803                 $this->loadPageData( self::READ_LATEST );
2804                 $id = $this->getId();
2805                 // T98706: lock the page from various other updates but avoid using
2806                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2807                 // the revisions queries (which also JOIN on user). Only lock the page
2808                 // row and CAS check on page_latest to see if the trx snapshot matches.
2809                 $lockedLatest = $this->lockAndGetLatest();
2810                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2811                         $dbw->endAtomic( __METHOD__ );
2812                         // Page not there or trx snapshot is stale
2813                         $status->error( 'cannotdelete',
2814                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2815                         return $status;
2816                 }
2817
2818                 // Given the lock above, we can be confident in the title and page ID values
2819                 $namespace = $this->getTitle()->getNamespace();
2820                 $dbKey = $this->getTitle()->getDBkey();
2821
2822                 // At this point we are now comitted to returning an OK
2823                 // status unless some DB query error or other exception comes up.
2824                 // This way callers don't have to call rollback() if $status is bad
2825                 // unless they actually try to catch exceptions (which is rare).
2826
2827                 // we need to remember the old content so we can use it to generate all deletion updates.
2828                 $revision = $this->getRevision();
2829                 try {
2830                         $content = $this->getContent( Revision::RAW );
2831                 } catch ( Exception $ex ) {
2832                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2833                                 . $ex->getMessage() );
2834
2835                         $content = null;
2836                 }
2837
2838                 $fields = Revision::selectFields();
2839                 $bitfield = false;
2840
2841                 // Bitfields to further suppress the content
2842                 if ( $suppress ) {
2843                         $bitfield = Revision::SUPPRESSED_ALL;
2844                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2845                 }
2846
2847                 // For now, shunt the revision data into the archive table.
2848                 // Text is *not* removed from the text table; bulk storage
2849                 // is left intact to avoid breaking block-compression or
2850                 // immutable storage schemes.
2851                 // In the future, we may keep revisions and mark them with
2852                 // the rev_deleted field, which is reserved for this purpose.
2853
2854                 // Get all of the page revisions
2855                 $res = $dbw->select(
2856                         'revision',
2857                         $fields,
2858                         [ 'rev_page' => $id ],
2859                         __METHOD__,
2860                         'FOR UPDATE'
2861                 );
2862                 // Build their equivalent archive rows
2863                 $rowsInsert = [];
2864                 foreach ( $res as $row ) {
2865                         $rowInsert = [
2866                                 'ar_namespace'  => $namespace,
2867                                 'ar_title'      => $dbKey,
2868                                 'ar_comment'    => $row->rev_comment,
2869                                 'ar_user'       => $row->rev_user,
2870                                 'ar_user_text'  => $row->rev_user_text,
2871                                 'ar_timestamp'  => $row->rev_timestamp,
2872                                 'ar_minor_edit' => $row->rev_minor_edit,
2873                                 'ar_rev_id'     => $row->rev_id,
2874                                 'ar_parent_id'  => $row->rev_parent_id,
2875                                 'ar_text_id'    => $row->rev_text_id,
2876                                 'ar_text'       => '',
2877                                 'ar_flags'      => '',
2878                                 'ar_len'        => $row->rev_len,
2879                                 'ar_page_id'    => $id,
2880                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2881                                 'ar_sha1'       => $row->rev_sha1,
2882                         ];
2883                         if ( $wgContentHandlerUseDB ) {
2884                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2885                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2886                         }
2887                         $rowsInsert[] = $rowInsert;
2888                 }
2889                 // Copy them into the archive table
2890                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2891                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2892                 $archivedRevisionCount = $dbw->affectedRows();
2893
2894                 // Clone the title and wikiPage, so we have the information we need when
2895                 // we log and run the ArticleDeleteComplete hook.
2896                 $logTitle = clone $this->mTitle;
2897                 $wikiPageBeforeDelete = clone $this;
2898
2899                 // Now that it's safely backed up, delete it
2900                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2901                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2902
2903                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2904                 $logtype = $suppress ? 'suppress' : 'delete';
2905
2906                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2907                 $logEntry->setPerformer( $user );
2908                 $logEntry->setTarget( $logTitle );
2909                 $logEntry->setComment( $reason );
2910                 $logEntry->setTags( $tags );
2911                 $logid = $logEntry->insert();
2912
2913                 $dbw->onTransactionPreCommitOrIdle(
2914                         function () use ( $dbw, $logEntry, $logid ) {
2915                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2916                                 $logEntry->publish( $logid );
2917                         },
2918                         __METHOD__
2919                 );
2920
2921                 $dbw->endAtomic( __METHOD__ );
2922
2923                 $this->doDeleteUpdates( $id, $content, $revision );
2924
2925                 Hooks::run( 'ArticleDeleteComplete', [
2926                         &$wikiPageBeforeDelete,
2927                         &$user,
2928                         $reason,
2929                         $id,
2930                         $content,
2931                         $logEntry,
2932                         $archivedRevisionCount
2933                 ] );
2934                 $status->value = $logid;
2935
2936                 // Show log excerpt on 404 pages rather than just a link
2937                 $cache = ObjectCache::getMainStashInstance();
2938                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2939                 $cache->set( $key, 1, $cache::TTL_DAY );
2940
2941                 return $status;
2942         }
2943
2944         /**
2945          * Lock the page row for this title+id and return page_latest (or 0)
2946          *
2947          * @return integer Returns 0 if no row was found with this title+id
2948          * @since 1.27
2949          */
2950         public function lockAndGetLatest() {
2951                 return (int)wfGetDB( DB_MASTER )->selectField(
2952                         'page',
2953                         'page_latest',
2954                         [
2955                                 'page_id' => $this->getId(),
2956                                 // Typically page_id is enough, but some code might try to do
2957                                 // updates assuming the title is the same, so verify that
2958                                 'page_namespace' => $this->getTitle()->getNamespace(),
2959                                 'page_title' => $this->getTitle()->getDBkey()
2960                         ],
2961                         __METHOD__,
2962                         [ 'FOR UPDATE' ]
2963                 );
2964         }
2965
2966         /**
2967          * Do some database updates after deletion
2968          *
2969          * @param int $id The page_id value of the page being deleted
2970          * @param Content|null $content Optional page content to be used when determining
2971          *   the required updates. This may be needed because $this->getContent()
2972          *   may already return null when the page proper was deleted.
2973          * @param Revision|null $revision The latest page revision
2974          */
2975         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
2976                 try {
2977                         $countable = $this->isCountable();
2978                 } catch ( Exception $ex ) {
2979                         // fallback for deleting broken pages for which we cannot load the content for
2980                         // some reason. Note that doDeleteArticleReal() already logged this problem.
2981                         $countable = false;
2982                 }
2983
2984                 // Update site status
2985                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
2986
2987                 // Delete pagelinks, update secondary indexes, etc
2988                 $updates = $this->getDeletionUpdates( $content );
2989                 foreach ( $updates as $update ) {
2990                         DeferredUpdates::addUpdate( $update );
2991                 }
2992
2993                 // Reparse any pages transcluding this page
2994                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2995
2996                 // Reparse any pages including this image
2997                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2998                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2999                 }
3000
3001                 // Clear caches
3002                 WikiPage::onArticleDelete( $this->mTitle );
3003                 ResourceLoaderWikiModule::invalidateModuleCache(
3004                         $this->mTitle, $revision, null, wfWikiID()
3005                 );
3006
3007                 // Reset this object and the Title object
3008                 $this->loadFromRow( false, self::READ_LATEST );
3009
3010                 // Search engine
3011                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3012         }
3013
3014         /**
3015          * Roll back the most recent consecutive set of edits to a page
3016          * from the same user; fails if there are no eligible edits to
3017          * roll back to, e.g. user is the sole contributor. This function
3018          * performs permissions checks on $user, then calls commitRollback()
3019          * to do the dirty work
3020          *
3021          * @todo Separate the business/permission stuff out from backend code
3022          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3023          *
3024          * @param string $fromP Name of the user whose edits to rollback.
3025          * @param string $summary Custom summary. Set to default summary if empty.
3026          * @param string $token Rollback token.
3027          * @param bool $bot If true, mark all reverted edits as bot.
3028          *
3029          * @param array $resultDetails Array contains result-specific array of additional values
3030          *    'alreadyrolled' : 'current' (rev)
3031          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3032          *
3033          * @param User $user The user performing the rollback
3034          * @param array|null $tags Change tags to apply to the rollback
3035          * Callers are responsible for permission checks
3036          * (with ChangeTags::canAddTagsAccompanyingChange)
3037          *
3038          * @return array Array of errors, each error formatted as
3039          *   array(messagekey, param1, param2, ...).
3040          * On success, the array is empty.  This array can also be passed to
3041          * OutputPage::showPermissionsErrorPage().
3042          */
3043         public function doRollback(
3044                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3045         ) {
3046                 $resultDetails = null;
3047
3048                 // Check permissions
3049                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3050                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3051                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3052
3053                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3054                         $errors[] = [ 'sessionfailure' ];
3055                 }
3056
3057                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3058                         $errors[] = [ 'actionthrottledtext' ];
3059                 }
3060
3061                 // If there were errors, bail out now
3062                 if ( !empty( $errors ) ) {
3063                         return $errors;
3064                 }
3065
3066                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3067         }
3068
3069         /**
3070          * Backend implementation of doRollback(), please refer there for parameter
3071          * and return value documentation
3072          *
3073          * NOTE: This function does NOT check ANY permissions, it just commits the
3074          * rollback to the DB. Therefore, you should only call this function direct-
3075          * ly if you want to use custom permissions checks. If you don't, use
3076          * doRollback() instead.
3077          * @param string $fromP Name of the user whose edits to rollback.
3078          * @param string $summary Custom summary. Set to default summary if empty.
3079          * @param bool $bot If true, mark all reverted edits as bot.
3080          *
3081          * @param array $resultDetails Contains result-specific array of additional values
3082          * @param User $guser The user performing the rollback
3083          * @param array|null $tags Change tags to apply to the rollback
3084          * Callers are responsible for permission checks
3085          * (with ChangeTags::canAddTagsAccompanyingChange)
3086          *
3087          * @return array
3088          */
3089         public function commitRollback( $fromP, $summary, $bot,
3090                 &$resultDetails, User $guser, $tags = null
3091         ) {
3092                 global $wgUseRCPatrol, $wgContLang;
3093
3094                 $dbw = wfGetDB( DB_MASTER );
3095
3096                 if ( wfReadOnly() ) {
3097                         return [ [ 'readonlytext' ] ];
3098                 }
3099
3100                 // Get the last editor
3101                 $current = $this->getRevision();
3102                 if ( is_null( $current ) ) {
3103                         // Something wrong... no page?
3104                         return [ [ 'notanarticle' ] ];
3105                 }
3106
3107                 $from = str_replace( '_', ' ', $fromP );
3108                 // User name given should match up with the top revision.
3109                 // If the user was deleted then $from should be empty.
3110                 if ( $from != $current->getUserText() ) {
3111                         $resultDetails = [ 'current' => $current ];
3112                         return [ [ 'alreadyrolled',
3113                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3114                                 htmlspecialchars( $fromP ),
3115                                 htmlspecialchars( $current->getUserText() )
3116                         ] ];
3117                 }
3118
3119                 // Get the last edit not by this person...
3120                 // Note: these may not be public values
3121                 $user = intval( $current->getUser( Revision::RAW ) );
3122                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3123                 $s = $dbw->selectRow( 'revision',
3124                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3125                         [ 'rev_page' => $current->getPage(),
3126                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3127                         ], __METHOD__,
3128                         [ 'USE INDEX' => 'page_timestamp',
3129                                 'ORDER BY' => 'rev_timestamp DESC' ]
3130                         );
3131                 if ( $s === false ) {
3132                         // No one else ever edited this page
3133                         return [ [ 'cantrollback' ] ];
3134                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3135                         || $s->rev_deleted & Revision::DELETED_USER
3136                 ) {
3137                         // Only admins can see this text
3138                         return [ [ 'notvisiblerev' ] ];
3139                 }
3140
3141                 // Generate the edit summary if necessary
3142                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3143                 if ( empty( $summary ) ) {
3144                         if ( $from == '' ) { // no public user name
3145                                 $summary = wfMessage( 'revertpage-nouser' );
3146                         } else {
3147                                 $summary = wfMessage( 'revertpage' );
3148                         }
3149                 }
3150
3151                 // Allow the custom summary to use the same args as the default message
3152                 $args = [
3153                         $target->getUserText(), $from, $s->rev_id,
3154                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3155                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3156                 ];
3157                 if ( $summary instanceof Message ) {
3158                         $summary = $summary->params( $args )->inContentLanguage()->text();
3159                 } else {
3160                         $summary = wfMsgReplaceArgs( $summary, $args );
3161                 }
3162
3163                 // Trim spaces on user supplied text
3164                 $summary = trim( $summary );
3165
3166                 // Truncate for whole multibyte characters.
3167                 $summary = $wgContLang->truncate( $summary, 255 );
3168
3169                 // Save
3170                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3171
3172                 if ( $guser->isAllowed( 'minoredit' ) ) {
3173                         $flags |= EDIT_MINOR;
3174                 }
3175
3176                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3177                         $flags |= EDIT_FORCE_BOT;
3178                 }
3179
3180                 $targetContent = $target->getContent();
3181                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3182
3183                 // Actually store the edit
3184                 $status = $this->doEditContent(
3185                         $targetContent,
3186                         $summary,
3187                         $flags,
3188                         $target->getId(),
3189                         $guser,
3190                         null,
3191                         $tags
3192                 );
3193
3194                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3195                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3196                 $set = [];
3197                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3198                         // Mark all reverted edits as bot
3199                         $set['rc_bot'] = 1;
3200                 }
3201
3202                 if ( $wgUseRCPatrol ) {
3203                         // Mark all reverted edits as patrolled
3204                         $set['rc_patrolled'] = 1;
3205                 }
3206
3207                 if ( count( $set ) ) {
3208                         $dbw->update( 'recentchanges', $set,
3209                                 [ /* WHERE */
3210                                         'rc_cur_id' => $current->getPage(),
3211                                         'rc_user_text' => $current->getUserText(),
3212                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3213                                 ],
3214                                 __METHOD__
3215                         );
3216                 }
3217
3218                 if ( !$status->isOK() ) {
3219                         return $status->getErrorsArray();
3220                 }
3221
3222                 // raise error, when the edit is an edit without a new version
3223                 $statusRev = isset( $status->value['revision'] )
3224                         ? $status->value['revision']
3225                         : null;
3226                 if ( !( $statusRev instanceof Revision ) ) {
3227                         $resultDetails = [ 'current' => $current ];
3228                         return [ [ 'alreadyrolled',
3229                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3230                                         htmlspecialchars( $fromP ),
3231                                         htmlspecialchars( $current->getUserText() )
3232                         ] ];
3233                 }
3234
3235                 if ( $changingContentModel ) {
3236                         // If the content model changed during the rollback,
3237                         // make sure it gets logged to Special:Log/contentmodel
3238                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3239                         $log->setPerformer( $guser );
3240                         $log->setTarget( $this->mTitle );
3241                         $log->setComment( $summary );
3242                         $log->setParameters( [
3243                                 '4::oldmodel' => $current->getContentModel(),
3244                                 '5::newmodel' => $targetContent->getModel(),
3245                         ] );
3246
3247                         $logId = $log->insert( $dbw );
3248                         $log->publish( $logId );
3249                 }
3250
3251                 $revId = $statusRev->getId();
3252
3253                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3254
3255                 $resultDetails = [
3256                         'summary' => $summary,
3257                         'current' => $current,
3258                         'target' => $target,
3259                         'newid' => $revId
3260                 ];
3261
3262                 return [];
3263         }
3264
3265         /**
3266          * The onArticle*() functions are supposed to be a kind of hooks
3267          * which should be called whenever any of the specified actions
3268          * are done.
3269          *
3270          * This is a good place to put code to clear caches, for instance.
3271          *
3272          * This is called on page move and undelete, as well as edit
3273          *
3274          * @param Title $title
3275          */
3276         public static function onArticleCreate( Title $title ) {
3277                 // Update existence markers on article/talk tabs...
3278                 $other = $title->getOtherPage();
3279
3280                 $other->purgeSquid();
3281
3282                 $title->touchLinks();
3283                 $title->purgeSquid();
3284                 $title->deleteTitleProtection();
3285
3286                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3287
3288                 if ( $title->getNamespace() == NS_CATEGORY ) {
3289                         // Load the Category object, which will schedule a job to create
3290                         // the category table row if necessary. Checking a replica DB is ok
3291                         // here, in the worst case it'll run an unnecessary recount job on
3292                         // a category that probably doesn't have many members.
3293                         Category::newFromTitle( $title )->getID();
3294                 }
3295         }
3296
3297         /**
3298          * Clears caches when article is deleted
3299          *
3300          * @param Title $title
3301          */
3302         public static function onArticleDelete( Title $title ) {
3303                 // Update existence markers on article/talk tabs...
3304                 $other = $title->getOtherPage();
3305
3306                 $other->purgeSquid();
3307
3308                 $title->touchLinks();
3309                 $title->purgeSquid();
3310
3311                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3312
3313                 // File cache
3314                 HTMLFileCache::clearFileCache( $title );
3315                 InfoAction::invalidateCache( $title );
3316
3317                 // Messages
3318                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3319                         MessageCache::singleton()->updateMessageOverride( $title, null );
3320                 }
3321
3322                 // Images
3323                 if ( $title->getNamespace() == NS_FILE ) {
3324                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3325                 }
3326
3327                 // User talk pages
3328                 if ( $title->getNamespace() == NS_USER_TALK ) {
3329                         $user = User::newFromName( $title->getText(), false );
3330                         if ( $user ) {
3331                                 $user->setNewtalk( false );
3332                         }
3333                 }
3334
3335                 // Image redirects
3336                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3337         }
3338
3339         /**
3340          * Purge caches on page update etc
3341          *
3342          * @param Title $title
3343          * @param Revision|null $revision Revision that was just saved, may be null
3344          */
3345         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3346                 // Invalidate caches of articles which include this page
3347                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3348
3349                 // Invalidate the caches of all pages which redirect here
3350                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3351
3352                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3353
3354                 // Purge CDN for this page only
3355                 $title->purgeSquid();
3356                 // Clear file cache for this page only
3357                 HTMLFileCache::clearFileCache( $title );
3358
3359                 $revid = $revision ? $revision->getId() : null;
3360                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3361                         InfoAction::invalidateCache( $title, $revid );
3362                 } );
3363         }
3364
3365         /**#@-*/
3366
3367         /**
3368          * Returns a list of categories this page is a member of.
3369          * Results will include hidden categories
3370          *
3371          * @return TitleArray
3372          */
3373         public function getCategories() {
3374                 $id = $this->getId();
3375                 if ( $id == 0 ) {
3376                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3377                 }
3378
3379                 $dbr = wfGetDB( DB_REPLICA );
3380                 $res = $dbr->select( 'categorylinks',
3381                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3382                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3383                         // as not being aliases, and NS_CATEGORY is numeric
3384                         [ 'cl_from' => $id ],
3385                         __METHOD__ );
3386
3387                 return TitleArray::newFromResult( $res );
3388         }
3389
3390         /**
3391          * Returns a list of hidden categories this page is a member of.
3392          * Uses the page_props and categorylinks tables.
3393          *
3394          * @return array Array of Title objects
3395          */
3396         public function getHiddenCategories() {
3397                 $result = [];
3398                 $id = $this->getId();
3399
3400                 if ( $id == 0 ) {
3401                         return [];
3402                 }
3403
3404                 $dbr = wfGetDB( DB_REPLICA );
3405                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3406                         [ 'cl_to' ],
3407                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3408                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3409                         __METHOD__ );
3410
3411                 if ( $res !== false ) {
3412                         foreach ( $res as $row ) {
3413                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3414                         }
3415                 }
3416
3417                 return $result;
3418         }
3419
3420         /**
3421          * Auto-generates a deletion reason
3422          *
3423          * @param bool &$hasHistory Whether the page has a history
3424          * @return string|bool String containing deletion reason or empty string, or boolean false
3425          *    if no revision occurred
3426          */
3427         public function getAutoDeleteReason( &$hasHistory ) {
3428                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3429         }
3430
3431         /**
3432          * Update all the appropriate counts in the category table, given that
3433          * we've added the categories $added and deleted the categories $deleted.
3434          *
3435          * This should only be called from deferred updates or jobs to avoid contention.
3436          *
3437          * @param array $added The names of categories that were added
3438          * @param array $deleted The names of categories that were deleted
3439          * @param integer $id Page ID (this should be the original deleted page ID)
3440          */
3441         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3442                 $id = $id ?: $this->getId();
3443                 $ns = $this->getTitle()->getNamespace();
3444
3445                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3446                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3447                 if ( $ns == NS_CATEGORY ) {
3448                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3449                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3450                 } elseif ( $ns == NS_FILE ) {
3451                         $addFields[] = 'cat_files = cat_files + 1';
3452                         $removeFields[] = 'cat_files = cat_files - 1';
3453                 }
3454
3455                 $dbw = wfGetDB( DB_MASTER );
3456
3457                 if ( count( $added ) ) {
3458                         $existingAdded = $dbw->selectFieldValues(
3459                                 'category',
3460                                 'cat_title',
3461                                 [ 'cat_title' => $added ],
3462                                 __METHOD__
3463                         );
3464
3465                         // For category rows that already exist, do a plain
3466                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3467                         // to avoid creating gaps in the cat_id sequence.
3468                         if ( count( $existingAdded ) ) {
3469                                 $dbw->update(
3470                                         'category',
3471                                         $addFields,
3472                                         [ 'cat_title' => $existingAdded ],
3473                                         __METHOD__
3474                                 );
3475                         }
3476
3477                         $missingAdded = array_diff( $added, $existingAdded );
3478                         if ( count( $missingAdded ) ) {
3479                                 $insertRows = [];
3480                                 foreach ( $missingAdded as $cat ) {
3481                                         $insertRows[] = [
3482                                                 'cat_title'   => $cat,
3483                                                 'cat_pages'   => 1,
3484                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3485                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3486                                         ];
3487                                 }
3488                                 $dbw->upsert(
3489                                         'category',
3490                                         $insertRows,
3491                                         [ 'cat_title' ],
3492                                         $addFields,
3493                                         __METHOD__
3494                                 );
3495                         }
3496                 }
3497
3498                 if ( count( $deleted ) ) {
3499                         $dbw->update(
3500                                 'category',
3501                                 $removeFields,
3502                                 [ 'cat_title' => $deleted ],
3503                                 __METHOD__
3504                         );
3505                 }
3506
3507                 foreach ( $added as $catName ) {
3508                         $cat = Category::newFromName( $catName );
3509                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3510                 }
3511
3512                 foreach ( $deleted as $catName ) {
3513                         $cat = Category::newFromName( $catName );
3514                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3515                 }
3516
3517                 // Refresh counts on categories that should be empty now, to
3518                 // trigger possible deletion. Check master for the most
3519                 // up-to-date cat_pages.
3520                 if ( count( $deleted ) ) {
3521                         $rows = $dbw->select(
3522                                 'category',
3523                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3524                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3525                                 __METHOD__
3526                         );
3527                         foreach ( $rows as $row ) {
3528                                 $cat = Category::newFromRow( $row );
3529                                 $cat->refreshCounts();
3530                         }
3531                 }
3532         }
3533
3534         /**
3535          * Opportunistically enqueue link update jobs given fresh parser output if useful
3536          *
3537          * @param ParserOutput $parserOutput Current version page output
3538          * @since 1.25
3539          */
3540         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3541                 if ( wfReadOnly() ) {
3542                         return;
3543                 }
3544
3545                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3546                         [ $this, $this->mTitle, $parserOutput ]
3547                 ) ) {
3548                         return;
3549                 }
3550
3551                 $config = RequestContext::getMain()->getConfig();
3552
3553                 $params = [
3554                         'isOpportunistic' => true,
3555                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3556                 ];
3557
3558                 if ( $this->mTitle->areRestrictionsCascading() ) {
3559                         // If the page is cascade protecting, the links should really be up-to-date
3560                         JobQueueGroup::singleton()->lazyPush(
3561                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3562                         );
3563                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3564                         // Assume the output contains "dynamic" time/random based magic words.
3565                         // Only update pages that expired due to dynamic content and NOT due to edits
3566                         // to referenced templates/files. When the cache expires due to dynamic content,
3567                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3568                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3569                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3570                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3571                                 // If a page is uncacheable, do not keep spamming a job for it.
3572                                 // Although it would be de-duplicated, it would still waste I/O.
3573                                 $cache = ObjectCache::getLocalClusterInstance();
3574                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3575                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3576                                 if ( $cache->add( $key, time(), $ttl ) ) {
3577                                         JobQueueGroup::singleton()->lazyPush(
3578                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3579                                         );
3580                                 }
3581                         }
3582                 }
3583         }
3584
3585         /**
3586          * Returns a list of updates to be performed when this page is deleted. The
3587          * updates should remove any information about this page from secondary data
3588          * stores such as links tables.
3589          *
3590          * @param Content|null $content Optional Content object for determining the
3591          *   necessary updates.
3592          * @return DeferrableUpdate[]
3593          */
3594         public function getDeletionUpdates( Content $content = null ) {
3595                 if ( !$content ) {
3596                         // load content object, which may be used to determine the necessary updates.
3597                         // XXX: the content may not be needed to determine the updates.
3598                         try {
3599                                 $content = $this->getContent( Revision::RAW );
3600                         } catch ( Exception $ex ) {
3601                                 // If we can't load the content, something is wrong. Perhaps that's why
3602                                 // the user is trying to delete the page, so let's not fail in that case.
3603                                 // Note that doDeleteArticleReal() will already have logged an issue with
3604                                 // loading the content.
3605                         }
3606                 }
3607
3608                 if ( !$content ) {
3609                         $updates = [];
3610                 } else {
3611                         $updates = $content->getDeletionUpdates( $this );
3612                 }
3613
3614                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3615                 return $updates;
3616         }
3617
3618         /**
3619          * Whether this content displayed on this page
3620          * comes from the local database
3621          *
3622          * @since 1.28
3623          * @return bool
3624          */
3625         public function isLocal() {
3626                 return true;
3627         }
3628
3629         /**
3630          * The display name for the site this content
3631          * come from. If a subclass overrides isLocal(),
3632          * this could return something other than the
3633          * current site name
3634          *
3635          * @since 1.28
3636          * @return string
3637          */
3638         public function getWikiDisplayName() {
3639                 global $wgSitename;
3640                 return $wgSitename;
3641         }
3642
3643         /**
3644          * Get the source URL for the content on this page,
3645          * typically the canonical URL, but may be a remote
3646          * link if the content comes from another site
3647          *
3648          * @since 1.28
3649          * @return string
3650          */
3651         public function getSourceURL() {
3652                 return $this->getTitle()->getCanonicalURL();
3653         }
3654
3655         /*
3656          * @param WANObjectCache $cache
3657          * @return string[]
3658          * @since 1.28
3659          */
3660         public function getMutableCacheKeys( WANObjectCache $cache ) {
3661                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3662
3663                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3664         }
3665 }