includes/page/WikiPage.php

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