includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 $page = null;
 125                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 126                         return $page;
 127                 }
 128
 129                 switch ( $ns ) {
 130                         case NS_FILE:
 131                                 $page = new WikiFilePage( $title );
 132                                 break;
 133                         case NS_CATEGORY:
 134                                 $page = new WikiCategoryPage( $title );
 135                                 break;
 136                         default:
 137                                 $page = new WikiPage( $title );
 138                 }
 139
 140                 return $page;
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          *
 146          * @param int $id Article ID to load
 147          * @param string|int $from One of the following values:
 148          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 150          *
 151          * @return WikiPage|null
 152          */
 153         public static function newFromID( $id, $from = 'fromdb' ) {
 154                 // page id's are never 0 or negative, see bug 61166
 155                 if ( $id < 1 ) {
 156                         return null;
 157                 }
 158
 159                 $from = self::convertSelectType( $from );
 160                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 161                 $row = $db->selectRow(
 162                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 163                 if ( !$row ) {
 164                         return null;
 165                 }
 166                 return self::newFromRow( $row, $from );
 167         }
 168
 169         /**
 170          * Constructor from a database row
 171          *
 172          * @since 1.20
 173          * @param object $row Database row containing at least fields returned by selectFields().
 174          * @param string|int $from Source of $data:
 175          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 176          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 177          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 178          * @return WikiPage
 179          */
 180         public static function newFromRow( $row, $from = 'fromdb' ) {
 181                 $page = self::factory( Title::newFromRow( $row ) );
 182                 $page->loadFromRow( $row, $from );
 183                 return $page;
 184         }
 185
 186         /**
 187          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 188          *
 189          * @param object|string|int $type
 190          * @return mixed
 191          */
 192         private static function convertSelectType( $type ) {
 193                 switch ( $type ) {
 194                 case 'fromdb':
 195                         return self::READ_NORMAL;
 196                 case 'fromdbmaster':
 197                         return self::READ_LATEST;
 198                 case 'forupdate':
 199                         return self::READ_LOCKING;
 200                 default:
 201                         // It may already be an integer or whatever else
 202                         return $type;
 203                 }
 204         }
 205
 206         /**
 207          * @todo Move this UI stuff somewhere else
 208          *
 209          * @see ContentHandler::getActionOverrides
 210          */
 211         public function getActionOverrides() {
 212                 return $this->getContentHandler()->getActionOverrides();
 213         }
 214
 215         /**
 216          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 217          *
 218          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 219          *
 220          * @return ContentHandler
 221          *
 222          * @since 1.21
 223          */
 224         public function getContentHandler() {
 225                 return ContentHandler::getForModelID( $this->getContentModel() );
 226         }
 227
 228         /**
 229          * Get the title object of the article
 230          * @return Title Title object of this page
 231          */
 232         public function getTitle() {
 233                 return $this->mTitle;
 234         }
 235
 236         /**
 237          * Clear the object
 238          * @return void
 239          */
 240         public function clear() {
 241                 $this->mDataLoaded = false;
 242                 $this->mDataLoadedFrom = self::READ_NONE;
 243
 244                 $this->clearCacheFields();
 245         }
 246
 247         /**
 248          * Clear the object cache fields
 249          * @return void
 250          */
 251         protected function clearCacheFields() {
 252                 $this->mId = null;
 253                 $this->mRedirectTarget = null; // Title object if set
 254                 $this->mLastRevision = null; // Latest revision
 255                 $this->mTouched = '19700101000000';
 256                 $this->mLinksUpdated = '19700101000000';
 257                 $this->mTimestamp = '';
 258                 $this->mIsRedirect = false;
 259                 $this->mLatest = false;
 260                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 261                 // the requested rev ID and content against the cached one for equality. For most
 262                 // content types, the output should not change during the lifetime of this cache.
 263                 // Clearing it can cause extra parses on edit for no reason.
 264         }
 265
 266         /**
 267          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 268          * @return void
 269          * @since 1.23
 270          */
 271         public function clearPreparedEdit() {
 272                 $this->mPreparedEdit = false;
 273         }
 274
 275         /**
 276          * Return the list of revision fields that should be selected to create
 277          * a new page.
 278          *
 279          * @return array
 280          */
 281         public static function selectFields() {
 282                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 283
 284                 $fields = [
 285                         'page_id',
 286                         'page_namespace',
 287                         'page_title',
 288                         'page_restrictions',
 289                         'page_is_redirect',
 290                         'page_is_new',
 291                         'page_random',
 292                         'page_touched',
 293                         'page_links_updated',
 294                         'page_latest',
 295                         'page_len',
 296                 ];
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 if ( $wgPageLanguageUseDB ) {
 303                         $fields[] = 'page_lang';
 304                 }
 305
 306                 return $fields;
 307         }
 308
 309         /**
 310          * Fetch a page record with the given conditions
 311          * @param IDatabase $dbr
 312          * @param array $conditions
 313          * @param array $options
 314          * @return object|bool Database result resource, or false on failure
 315          */
 316         protected function pageData( $dbr, $conditions, $options = [] ) {
 317                 $fields = self::selectFields();
 318
 319                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 320
 321                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 322
 323                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 324
 325                 return $row;
 326         }
 327
 328         /**
 329          * Fetch a page record matching the Title object's namespace and title
 330          * using a sanitized title string
 331          *
 332          * @param IDatabase $dbr
 333          * @param Title $title
 334          * @param array $options
 335          * @return object|bool Database result resource, or false on failure
 336          */
 337         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 338                 return $this->pageData( $dbr, [
 339                         'page_namespace' => $title->getNamespace(),
 340                         'page_title' => $title->getDBkey() ], $options );
 341         }
 342
 343         /**
 344          * Fetch a page record matching the requested ID
 345          *
 346          * @param IDatabase $dbr
 347          * @param int $id
 348          * @param array $options
 349          * @return object|bool Database result resource, or false on failure
 350          */
 351         public function pageDataFromId( $dbr, $id, $options = [] ) {
 352                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 353         }
 354
 355         /**
 356          * Load the object from a given source by title
 357          *
 358          * @param object|string|int $from One of the following:
 359          *   - A DB query result object.
 360          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 361          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 362          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 363          *     using SELECT FOR UPDATE.
 364          *
 365          * @return void
 366          */
 367         public function loadPageData( $from = 'fromdb' ) {
 368                 $from = self::convertSelectType( $from );
 369                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 370                         // We already have the data from the correct location, no need to load it twice.
 371                         return;
 372                 }
 373
 374                 if ( is_int( $from ) ) {
 375                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 376                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 377
 378                         if ( !$data
 379                                 && $index == DB_REPLICA
 380                                 && wfGetLB()->getServerCount() > 1
 381                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 382                         ) {
 383                                 $from = self::READ_LATEST;
 384                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 385                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 386                         }
 387                 } else {
 388                         // No idea from where the caller got this data, assume replica DB.
 389                         $data = $from;
 390                         $from = self::READ_NORMAL;
 391                 }
 392
 393                 $this->loadFromRow( $data, $from );
 394         }
 395
 396         /**
 397          * Load the object from a database row
 398          *
 399          * @since 1.20
 400          * @param object|bool $data DB row containing fields returned by selectFields() or false
 401          * @param string|int $from One of the following:
 402          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 403          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 404          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 405          *          the master DB using SELECT FOR UPDATE
 406          */
 407         public function loadFromRow( $data, $from ) {
 408                 $lc = LinkCache::singleton();
 409                 $lc->clearLink( $this->mTitle );
 410
 411                 if ( $data ) {
 412                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 413
 414                         $this->mTitle->loadFromRow( $data );
 415
 416                         // Old-fashioned restrictions
 417                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 418
 419                         $this->mId = intval( $data->page_id );
 420                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 421                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 422                         $this->mIsRedirect = intval( $data->page_is_redirect );
 423                         $this->mLatest = intval( $data->page_latest );
 424                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 425                         // Double-check the ID of any cached latest Revision object for consistency.
 426                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 427                                 $this->mLastRevision = null;
 428                                 $this->mTimestamp = '';
 429                         }
 430                 } else {
 431                         $lc->addBadLinkObj( $this->mTitle );
 432
 433                         $this->mTitle->loadFromRow( false );
 434
 435                         $this->clearCacheFields();
 436
 437                         $this->mId = 0;
 438                 }
 439
 440                 $this->mDataLoaded = true;
 441                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 442         }
 443
 444         /**
 445          * @return int Page ID
 446          */
 447         public function getId() {
 448                 if ( !$this->mDataLoaded ) {
 449                         $this->loadPageData();
 450                 }
 451                 return $this->mId;
 452         }
 453
 454         /**
 455          * @return bool Whether or not the page exists in the database
 456          */
 457         public function exists() {
 458                 if ( !$this->mDataLoaded ) {
 459                         $this->loadPageData();
 460                 }
 461                 return $this->mId > 0;
 462         }
 463
 464         /**
 465          * Check if this page is something we're going to be showing
 466          * some sort of sensible content for. If we return false, page
 467          * views (plain action=view) will return an HTTP 404 response,
 468          * so spiders and robots can know they're following a bad link.
 469          *
 470          * @return bool
 471          */
 472         public function hasViewableContent() {
 473                 return $this->mTitle->isKnown();
 474         }
 475
 476         /**
 477          * Tests if the article content represents a redirect
 478          *
 479          * @return bool
 480          */
 481         public function isRedirect() {
 482                 if ( !$this->mDataLoaded ) {
 483                         $this->loadPageData();
 484                 }
 485
 486                 return (bool)$this->mIsRedirect;
 487         }
 488
 489         /**
 490          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 491          *
 492          * Will use the revisions actual content model if the page exists,
 493          * and the page's default if the page doesn't exist yet.
 494          *
 495          * @return string
 496          *
 497          * @since 1.21
 498          */
 499         public function getContentModel() {
 500                 if ( $this->exists() ) {
 501                         $cache = ObjectCache::getMainWANInstance();
 502
 503                         return $cache->getWithSetCallback(
 504                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 505                                 $cache::TTL_MONTH,
 506                                 function () {
 507                                         $rev = $this->getRevision();
 508                                         if ( $rev ) {
 509                                                 // Look at the revision's actual content model
 510                                                 return $rev->getContentModel();
 511                                         } else {
 512                                                 $title = $this->mTitle->getPrefixedDBkey();
 513                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 514                                                 return $this->mTitle->getContentModel();
 515                                         }
 516                                 }
 517                         );
 518                 }
 519
 520                 // use the default model for this page
 521                 return $this->mTitle->getContentModel();
 522         }
 523
 524         /**
 525          * Loads page_touched and returns a value indicating if it should be used
 526          * @return bool True if this page exists and is not a redirect
 527          */
 528         public function checkTouched() {
 529                 if ( !$this->mDataLoaded ) {
 530                         $this->loadPageData();
 531                 }
 532                 return ( $this->mId && !$this->mIsRedirect );
 533         }
 534
 535         /**
 536          * Get the page_touched field
 537          * @return string Containing GMT timestamp
 538          */
 539         public function getTouched() {
 540                 if ( !$this->mDataLoaded ) {
 541                         $this->loadPageData();
 542                 }
 543                 return $this->mTouched;
 544         }
 545
 546         /**
 547          * Get the page_links_updated field
 548          * @return string|null Containing GMT timestamp
 549          */
 550         public function getLinksTimestamp() {
 551                 if ( !$this->mDataLoaded ) {
 552                         $this->loadPageData();
 553                 }
 554                 return $this->mLinksUpdated;
 555         }
 556
 557         /**
 558          * Get the page_latest field
 559          * @return int The rev_id of current revision
 560          */
 561         public function getLatest() {
 562                 if ( !$this->mDataLoaded ) {
 563                         $this->loadPageData();
 564                 }
 565                 return (int)$this->mLatest;
 566         }
 567
 568         /**
 569          * Get the Revision object of the oldest revision
 570          * @return Revision|null
 571          */
 572         public function getOldestRevision() {
 573
 574                 // Try using the replica DB first, then try the master
 575                 $continue = 2;
 576                 $db = wfGetDB( DB_REPLICA );
 577                 $revSelectFields = Revision::selectFields();
 578
 579                 $row = null;
 580                 while ( $continue ) {
 581                         $row = $db->selectRow(
 582                                 [ 'page', 'revision' ],
 583                                 $revSelectFields,
 584                                 [
 585                                         'page_namespace' => $this->mTitle->getNamespace(),
 586                                         'page_title' => $this->mTitle->getDBkey(),
 587                                         'rev_page = page_id'
 588                                 ],
 589                                 __METHOD__,
 590                                 [
 591                                         'ORDER BY' => 'rev_timestamp ASC'
 592                                 ]
 593                         );
 594
 595                         if ( $row ) {
 596                                 $continue = 0;
 597                         } else {
 598                                 $db = wfGetDB( DB_MASTER );
 599                                 $continue--;
 600                         }
 601                 }
 602
 603                 return $row ? Revision::newFromRow( $row ) : null;
 604         }
 605
 606         /**
 607          * Loads everything except the text
 608          * This isn't necessary for all uses, so it's only done if needed.
 609          */
 610         protected function loadLastEdit() {
 611                 if ( $this->mLastRevision !== null ) {
 612                         return; // already loaded
 613                 }
 614
 615                 $latest = $this->getLatest();
 616                 if ( !$latest ) {
 617                         return; // page doesn't exist or is missing page_latest info
 618                 }
 619
 620                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 621                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 622                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 623                         // transactions, where S1 normally only sees changes committed before the first S1
 624                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 625                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 626                         // happened after the first S1 SELECT.
 627                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 628                         $flags = Revision::READ_LOCKING;
 629                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 630                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 631                         // Bug T93976: if page_latest was loaded from the master, fetch the
 632                         // revision from there as well, as it may not exist yet on a replica DB.
 633                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 634                         $flags = Revision::READ_LATEST;
 635                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 636                 } else {
 637                         $dbr = wfGetDB( DB_REPLICA );
 638                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 639                 }
 640
 641                 if ( $revision ) { // sanity
 642                         $this->setLastEdit( $revision );
 643                 }
 644         }
 645
 646         /**
 647          * Set the latest revision
 648          * @param Revision $revision
 649          */
 650         protected function setLastEdit( Revision $revision ) {
 651                 $this->mLastRevision = $revision;
 652                 $this->mTimestamp = $revision->getTimestamp();
 653         }
 654
 655         /**
 656          * Get the latest revision
 657          * @return Revision|null
 658          */
 659         public function getRevision() {
 660                 $this->loadLastEdit();
 661                 if ( $this->mLastRevision ) {
 662                         return $this->mLastRevision;
 663                 }
 664                 return null;
 665         }
 666
 667         /**
 668          * Get the content of the current revision. No side-effects...
 669          *
 670          * @param int $audience One of:
 671          *   Revision::FOR_PUBLIC       to be displayed to all users
 672          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 673          *   Revision::RAW              get the text regardless of permissions
 674          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 675          *   to the $audience parameter
 676          * @return Content|null The content of the current revision
 677          *
 678          * @since 1.21
 679          */
 680         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 681                 $this->loadLastEdit();
 682                 if ( $this->mLastRevision ) {
 683                         return $this->mLastRevision->getContent( $audience, $user );
 684                 }
 685                 return null;
 686         }
 687
 688         /**
 689          * Get the text of the current revision. No side-effects...
 690          *
 691          * @param int $audience One of:
 692          *   Revision::FOR_PUBLIC       to be displayed to all users
 693          *   Revision::FOR_THIS_USER    to be displayed to the given user
 694          *   Revision::RAW              get the text regardless of permissions
 695          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 696          *   to the $audience parameter
 697          * @return string|bool The text of the current revision
 698          * @deprecated since 1.21, getContent() should be used instead.
 699          */
 700         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 701                 wfDeprecated( __METHOD__, '1.21' );
 702
 703                 $this->loadLastEdit();
 704                 if ( $this->mLastRevision ) {
 705                         return $this->mLastRevision->getText( $audience, $user );
 706                 }
 707                 return false;
 708         }
 709
 710         /**
 711          * @return string MW timestamp of last article revision
 712          */
 713         public function getTimestamp() {
 714                 // Check if the field has been filled by WikiPage::setTimestamp()
 715                 if ( !$this->mTimestamp ) {
 716                         $this->loadLastEdit();
 717                 }
 718
 719                 return wfTimestamp( TS_MW, $this->mTimestamp );
 720         }
 721
 722         /**
 723          * Set the page timestamp (use only to avoid DB queries)
 724          * @param string $ts MW timestamp of last article revision
 725          * @return void
 726          */
 727         public function setTimestamp( $ts ) {
 728                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 729         }
 730
 731         /**
 732          * @param int $audience One of:
 733          *   Revision::FOR_PUBLIC       to be displayed to all users
 734          *   Revision::FOR_THIS_USER    to be displayed to the given user
 735          *   Revision::RAW              get the text regardless of permissions
 736          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 737          *   to the $audience parameter
 738          * @return int User ID for the user that made the last article revision
 739          */
 740         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 741                 $this->loadLastEdit();
 742                 if ( $this->mLastRevision ) {
 743                         return $this->mLastRevision->getUser( $audience, $user );
 744                 } else {
 745                         return -1;
 746                 }
 747         }
 748
 749         /**
 750          * Get the User object of the user who created the page
 751          * @param int $audience One of:
 752          *   Revision::FOR_PUBLIC       to be displayed to all users
 753          *   Revision::FOR_THIS_USER    to be displayed to the given user
 754          *   Revision::RAW              get the text regardless of permissions
 755          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 756          *   to the $audience parameter
 757          * @return User|null
 758          */
 759         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 760                 $revision = $this->getOldestRevision();
 761                 if ( $revision ) {
 762                         $userName = $revision->getUserText( $audience, $user );
 763                         return User::newFromName( $userName, false );
 764                 } else {
 765                         return null;
 766                 }
 767         }
 768
 769         /**
 770          * @param int $audience One of:
 771          *   Revision::FOR_PUBLIC       to be displayed to all users
 772          *   Revision::FOR_THIS_USER    to be displayed to the given user
 773          *   Revision::RAW              get the text regardless of permissions
 774          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 775          *   to the $audience parameter
 776          * @return string Username of the user that made the last article revision
 777          */
 778         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 779                 $this->loadLastEdit();
 780                 if ( $this->mLastRevision ) {
 781                         return $this->mLastRevision->getUserText( $audience, $user );
 782                 } else {
 783                         return '';
 784                 }
 785         }
 786
 787         /**
 788          * @param int $audience One of:
 789          *   Revision::FOR_PUBLIC       to be displayed to all users
 790          *   Revision::FOR_THIS_USER    to be displayed to the given user
 791          *   Revision::RAW              get the text regardless of permissions
 792          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 793          *   to the $audience parameter
 794          * @return string Comment stored for the last article revision
 795          */
 796         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 797                 $this->loadLastEdit();
 798                 if ( $this->mLastRevision ) {
 799                         return $this->mLastRevision->getComment( $audience, $user );
 800                 } else {
 801                         return '';
 802                 }
 803         }
 804
 805         /**
 806          * Returns true if last revision was marked as "minor edit"
 807          *
 808          * @return bool Minor edit indicator for the last article revision.
 809          */
 810         public function getMinorEdit() {
 811                 $this->loadLastEdit();
 812                 if ( $this->mLastRevision ) {
 813                         return $this->mLastRevision->isMinor();
 814                 } else {
 815                         return false;
 816                 }
 817         }
 818
 819         /**
 820          * Determine whether a page would be suitable for being counted as an
 821          * article in the site_stats table based on the title & its content
 822          *
 823          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 824          *   if false, the current database state will be used
 825          * @return bool
 826          */
 827         public function isCountable( $editInfo = false ) {
 828                 global $wgArticleCountMethod;
 829
 830                 if ( !$this->mTitle->isContentPage() ) {
 831                         return false;
 832                 }
 833
 834                 if ( $editInfo ) {
 835                         $content = $editInfo->pstContent;
 836                 } else {
 837                         $content = $this->getContent();
 838                 }
 839
 840                 if ( !$content || $content->isRedirect() ) {
 841                         return false;
 842                 }
 843
 844                 $hasLinks = null;
 845
 846                 if ( $wgArticleCountMethod === 'link' ) {
 847                         // nasty special case to avoid re-parsing to detect links
 848
 849                         if ( $editInfo ) {
 850                                 // ParserOutput::getLinks() is a 2D array of page links, so
 851                                 // to be really correct we would need to recurse in the array
 852                                 // but the main array should only have items in it if there are
 853                                 // links.
 854                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 855                         } else {
 856                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 857                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 858                         }
 859                 }
 860
 861                 return $content->isCountable( $hasLinks );
 862         }
 863
 864         /**
 865          * If this page is a redirect, get its target
 866          *
 867          * The target will be fetched from the redirect table if possible.
 868          * If this page doesn't have an entry there, call insertRedirect()
 869          * @return Title|null Title object, or null if this page is not a redirect
 870          */
 871         public function getRedirectTarget() {
 872                 if ( !$this->mTitle->isRedirect() ) {
 873                         return null;
 874                 }
 875
 876                 if ( $this->mRedirectTarget !== null ) {
 877                         return $this->mRedirectTarget;
 878                 }
 879
 880                 // Query the redirect table
 881                 $dbr = wfGetDB( DB_REPLICA );
 882                 $row = $dbr->selectRow( 'redirect',
 883                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 884                         [ 'rd_from' => $this->getId() ],
 885                         __METHOD__
 886                 );
 887
 888                 // rd_fragment and rd_interwiki were added later, populate them if empty
 889                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 890                         $this->mRedirectTarget = Title::makeTitle(
 891                                 $row->rd_namespace, $row->rd_title,
 892                                 $row->rd_fragment, $row->rd_interwiki
 893                         );
 894                         return $this->mRedirectTarget;
 895                 }
 896
 897                 // This page doesn't have an entry in the redirect table
 898                 $this->mRedirectTarget = $this->insertRedirect();
 899                 return $this->mRedirectTarget;
 900         }
 901
 902         /**
 903          * Insert an entry for this page into the redirect table if the content is a redirect
 904          *
 905          * The database update will be deferred via DeferredUpdates
 906          *
 907          * Don't call this function directly unless you know what you're doing.
 908          * @return Title|null Title object or null if not a redirect
 909          */
 910         public function insertRedirect() {
 911                 $content = $this->getContent();
 912                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 913                 if ( !$retval ) {
 914                         return null;
 915                 }
 916
 917                 // Update the DB post-send if the page has not cached since now
 918                 $that = $this;
 919                 $latest = $this->getLatest();
 920                 DeferredUpdates::addCallableUpdate(
 921                         function () use ( $that, $retval, $latest ) {
 922                                 $that->insertRedirectEntry( $retval, $latest );
 923                         },
 924                         DeferredUpdates::POSTSEND,
 925                         wfGetDB( DB_MASTER )
 926                 );
 927
 928                 return $retval;
 929         }
 930
 931         /**
 932          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 933          * @param Title $rt Redirect target
 934          * @param int|null $oldLatest Prior page_latest for check and set
 935          */
 936         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 937                 $dbw = wfGetDB( DB_MASTER );
 938                 $dbw->startAtomic( __METHOD__ );
 939
 940                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 941                         $dbw->upsert(
 942                                 'redirect',
 943                                 [
 944                                         'rd_from' => $this->getId(),
 945                                         'rd_namespace' => $rt->getNamespace(),
 946                                         'rd_title' => $rt->getDBkey(),
 947                                         'rd_fragment' => $rt->getFragment(),
 948                                         'rd_interwiki' => $rt->getInterwiki(),
 949                                 ],
 950                                 [ 'rd_from' ],
 951                                 [
 952                                         'rd_namespace' => $rt->getNamespace(),
 953                                         'rd_title' => $rt->getDBkey(),
 954                                         'rd_fragment' => $rt->getFragment(),
 955                                         'rd_interwiki' => $rt->getInterwiki(),
 956                                 ],
 957                                 __METHOD__
 958                         );
 959                 }
 960
 961                 $dbw->endAtomic( __METHOD__ );
 962         }
 963
 964         /**
 965          * Get the Title object or URL this page redirects to
 966          *
 967          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 968          */
 969         public function followRedirect() {
 970                 return $this->getRedirectURL( $this->getRedirectTarget() );
 971         }
 972
 973         /**
 974          * Get the Title object or URL to use for a redirect. We use Title
 975          * objects for same-wiki, non-special redirects and URLs for everything
 976          * else.
 977          * @param Title $rt Redirect target
 978          * @return bool|Title|string False, Title object of local target, or string with URL
 979          */
 980         public function getRedirectURL( $rt ) {
 981                 if ( !$rt ) {
 982                         return false;
 983                 }
 984
 985                 if ( $rt->isExternal() ) {
 986                         if ( $rt->isLocal() ) {
 987                                 // Offsite wikis need an HTTP redirect.
 988                                 // This can be hard to reverse and may produce loops,
 989                                 // so they may be disabled in the site configuration.
 990                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 991                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 992                         } else {
 993                                 // External pages without "local" bit set are not valid
 994                                 // redirect targets
 995                                 return false;
 996                         }
 997                 }
 998
 999                 if ( $rt->isSpecialPage() ) {
1000                         // Gotta handle redirects to special pages differently:
1001                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
1002                         // Some pages are not valid targets.
1003                         if ( $rt->isValidRedirectTarget() ) {
1004                                 return $rt->getFullURL();
1005                         } else {
1006                                 return false;
1007                         }
1008                 }
1009
1010                 return $rt;
1011         }
1012
1013         /**
1014          * Get a list of users who have edited this article, not including the user who made
1015          * the most recent revision, which you can get from $article->getUser() if you want it
1016          * @return UserArrayFromResult
1017          */
1018         public function getContributors() {
1019                 // @todo FIXME: This is expensive; cache this info somewhere.
1020
1021                 $dbr = wfGetDB( DB_REPLICA );
1022
1023                 if ( $dbr->implicitGroupby() ) {
1024                         $realNameField = 'user_real_name';
1025                 } else {
1026                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1027                 }
1028
1029                 $tables = [ 'revision', 'user' ];
1030
1031                 $fields = [
1032                         'user_id' => 'rev_user',
1033                         'user_name' => 'rev_user_text',
1034                         $realNameField,
1035                         'timestamp' => 'MAX(rev_timestamp)',
1036                 ];
1037
1038                 $conds = [ 'rev_page' => $this->getId() ];
1039
1040                 // The user who made the top revision gets credited as "this page was last edited by
1041                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1042                 $user = $this->getUser();
1043                 if ( $user ) {
1044                         $conds[] = "rev_user != $user";
1045                 } else {
1046                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1047                 }
1048
1049                 // Username hidden?
1050                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1051
1052                 $jconds = [
1053                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1054                 ];
1055
1056                 $options = [
1057                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1058                         'ORDER BY' => 'timestamp DESC',
1059                 ];
1060
1061                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1062                 return new UserArrayFromResult( $res );
1063         }
1064
1065         /**
1066          * Should the parser cache be used?
1067          *
1068          * @param ParserOptions $parserOptions ParserOptions to check
1069          * @param int $oldId
1070          * @return bool
1071          */
1072         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1073                 return $parserOptions->getStubThreshold() == 0
1074                         && $this->exists()
1075                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1076                         && $this->getContentHandler()->isParserCacheSupported();
1077         }
1078
1079         /**
1080          * Get a ParserOutput for the given ParserOptions and revision ID.
1081          *
1082          * The parser cache will be used if possible. Cache misses that result
1083          * in parser runs are debounced with PoolCounter.
1084          *
1085          * @since 1.19
1086          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1087          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1088          *                             get the current revision (default value)
1089          * @param bool          $forceParse Force reindexing, regardless of cache settings
1090          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1091          */
1092         public function getParserOutput(
1093                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1094         ) {
1095                 $useParserCache =
1096                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1097                 wfDebug( __METHOD__ .
1098                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1099                 if ( $parserOptions->getStubThreshold() ) {
1100                         wfIncrStats( 'pcache.miss.stub' );
1101                 }
1102
1103                 if ( $useParserCache ) {
1104                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1105                         if ( $parserOutput !== false ) {
1106                                 return $parserOutput;
1107                         }
1108                 }
1109
1110                 if ( $oldid === null || $oldid === 0 ) {
1111                         $oldid = $this->getLatest();
1112                 }
1113
1114                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1115                 $pool->execute();
1116
1117                 return $pool->getParserOutput();
1118         }
1119
1120         /**
1121          * Do standard deferred updates after page view (existing or missing page)
1122          * @param User $user The relevant user
1123          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1124          */
1125         public function doViewUpdates( User $user, $oldid = 0 ) {
1126                 if ( wfReadOnly() ) {
1127                         return;
1128                 }
1129
1130                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1131                 // Update newtalk / watchlist notification status
1132                 try {
1133                         $user->clearNotification( $this->mTitle, $oldid );
1134                 } catch ( DBError $e ) {
1135                         // Avoid outage if the master is not reachable
1136                         MWExceptionHandler::logException( $e );
1137                 }
1138         }
1139
1140         /**
1141          * Perform the actions of a page purging
1142          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1143          * @return bool
1144          */
1145         public function doPurge( $flags = self::PURGE_ALL ) {
1146                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1147                         return false;
1148                 }
1149
1150                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1151                         // Set page_touched in the database to invalidate all DC caches
1152                         $this->mTitle->invalidateCache();
1153                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1154                         // Delete the parser options key in the local cluster to invalidate the DC cache
1155                         ParserCache::singleton()->deleteOptionsKey( $this );
1156                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1157                         $cache = ObjectCache::getLocalClusterInstance();
1158                         $cache->set(
1159                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1160                                 wfTimestamp( TS_MW ),
1161                                 $cache::TTL_HOUR
1162                         );
1163                 }
1164
1165                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1166                         // Clear any HTML file cache
1167                         HTMLFileCache::clearFileCache( $this->getTitle() );
1168                         // Send purge after any page_touched above update was committed
1169                         DeferredUpdates::addUpdate(
1170                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1171                                 DeferredUpdates::PRESEND
1172                         );
1173                 }
1174
1175                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1176                         $messageCache = MessageCache::singleton();
1177                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1178                 }
1179
1180                 return true;
1181         }
1182
1183         /**
1184          * Get the last time a user explicitly purged the page via action=purge
1185          *
1186          * @return string|bool TS_MW timestamp or false
1187          * @since 1.28
1188          */
1189         public function getLastPurgeTimestamp() {
1190                 $cache = ObjectCache::getLocalClusterInstance();
1191
1192                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1193         }
1194
1195         /**
1196          * Insert a new empty page record for this article.
1197          * This *must* be followed up by creating a revision
1198          * and running $this->updateRevisionOn( ... );
1199          * or else the record will be left in a funky state.
1200          * Best if all done inside a transaction.
1201          *
1202          * @param IDatabase $dbw
1203          * @param int|null $pageId Custom page ID that will be used for the insert statement
1204          *
1205          * @return bool|int The newly created page_id key; false if the row was not
1206          *   inserted, e.g. because the title already existed or because the specified
1207          *   page ID is already in use.
1208          */
1209         public function insertOn( $dbw, $pageId = null ) {
1210                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1211                 $dbw->insert(
1212                         'page',
1213                         [
1214                                 'page_id'           => $pageIdForInsert,
1215                                 'page_namespace'    => $this->mTitle->getNamespace(),
1216                                 'page_title'        => $this->mTitle->getDBkey(),
1217                                 'page_restrictions' => '',
1218                                 'page_is_redirect'  => 0, // Will set this shortly...
1219                                 'page_is_new'       => 1,
1220                                 'page_random'       => wfRandom(),
1221                                 'page_touched'      => $dbw->timestamp(),
1222                                 'page_latest'       => 0, // Fill this in shortly...
1223                                 'page_len'          => 0, // Fill this in shortly...
1224                         ],
1225                         __METHOD__,
1226                         'IGNORE'
1227                 );
1228
1229                 if ( $dbw->affectedRows() > 0 ) {
1230                         $newid = $pageId ?: $dbw->insertId();
1231                         $this->mId = $newid;
1232                         $this->mTitle->resetArticleID( $newid );
1233
1234                         return $newid;
1235                 } else {
1236                         return false; // nothing changed
1237                 }
1238         }
1239
1240         /**
1241          * Update the page record to point to a newly saved revision.
1242          *
1243          * @param IDatabase $dbw
1244          * @param Revision $revision For ID number, and text used to set
1245          *   length and redirect status fields
1246          * @param int $lastRevision If given, will not overwrite the page field
1247          *   when different from the currently set value.
1248          *   Giving 0 indicates the new page flag should be set on.
1249          * @param bool $lastRevIsRedirect If given, will optimize adding and
1250          *   removing rows in redirect table.
1251          * @return bool Success; false if the page row was missing or page_latest changed
1252          */
1253         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1254                 $lastRevIsRedirect = null
1255         ) {
1256                 global $wgContentHandlerUseDB;
1257
1258                 // Assertion to try to catch T92046
1259                 if ( (int)$revision->getId() === 0 ) {
1260                         throw new InvalidArgumentException(
1261                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1262                         );
1263                 }
1264
1265                 $content = $revision->getContent();
1266                 $len = $content ? $content->getSize() : 0;
1267                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1268
1269                 $conditions = [ 'page_id' => $this->getId() ];
1270
1271                 if ( !is_null( $lastRevision ) ) {
1272                         // An extra check against threads stepping on each other
1273                         $conditions['page_latest'] = $lastRevision;
1274                 }
1275
1276                 $row = [ /* SET */
1277                         'page_latest'      => $revision->getId(),
1278                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1279                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1280                         'page_is_redirect' => $rt !== null ? 1 : 0,
1281                         'page_len'         => $len,
1282                 ];
1283
1284                 if ( $wgContentHandlerUseDB ) {
1285                         $row['page_content_model'] = $revision->getContentModel();
1286                 }
1287
1288                 $dbw->update( 'page',
1289                         $row,
1290                         $conditions,
1291                         __METHOD__ );
1292
1293                 $result = $dbw->affectedRows() > 0;
1294                 if ( $result ) {
1295                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1296                         $this->setLastEdit( $revision );
1297                         $this->mLatest = $revision->getId();
1298                         $this->mIsRedirect = (bool)$rt;
1299                         // Update the LinkCache.
1300                         LinkCache::singleton()->addGoodLinkObj(
1301                                 $this->getId(),
1302                                 $this->mTitle,
1303                                 $len,
1304                                 $this->mIsRedirect,
1305                                 $this->mLatest,
1306                                 $revision->getContentModel()
1307                         );
1308                 }
1309
1310                 return $result;
1311         }
1312
1313         /**
1314          * Add row to the redirect table if this is a redirect, remove otherwise.
1315          *
1316          * @param IDatabase $dbw
1317          * @param Title $redirectTitle Title object pointing to the redirect target,
1318          *   or NULL if this is not a redirect
1319          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1320          *   removing rows in redirect table.
1321          * @return bool True on success, false on failure
1322          * @private
1323          */
1324         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1325                 // Always update redirects (target link might have changed)
1326                 // Update/Insert if we don't know if the last revision was a redirect or not
1327                 // Delete if changing from redirect to non-redirect
1328                 $isRedirect = !is_null( $redirectTitle );
1329
1330                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1331                         return true;
1332                 }
1333
1334                 if ( $isRedirect ) {
1335                         $this->insertRedirectEntry( $redirectTitle );
1336                 } else {
1337                         // This is not a redirect, remove row from redirect table
1338                         $where = [ 'rd_from' => $this->getId() ];
1339                         $dbw->delete( 'redirect', $where, __METHOD__ );
1340                 }
1341
1342                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1343                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1344                 }
1345
1346                 return ( $dbw->affectedRows() != 0 );
1347         }
1348
1349         /**
1350          * If the given revision is newer than the currently set page_latest,
1351          * update the page record. Otherwise, do nothing.
1352          *
1353          * @deprecated since 1.24, use updateRevisionOn instead
1354          *
1355          * @param IDatabase $dbw
1356          * @param Revision $revision
1357          * @return bool
1358          */
1359         public function updateIfNewerOn( $dbw, $revision ) {
1360
1361                 $row = $dbw->selectRow(
1362                         [ 'revision', 'page' ],
1363                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1364                         [
1365                                 'page_id' => $this->getId(),
1366                                 'page_latest=rev_id' ],
1367                         __METHOD__ );
1368
1369                 if ( $row ) {
1370                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1371                                 return false;
1372                         }
1373                         $prev = $row->rev_id;
1374                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1375                 } else {
1376                         // No or missing previous revision; mark the page as new
1377                         $prev = 0;
1378                         $lastRevIsRedirect = null;
1379                 }
1380
1381                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1382
1383                 return $ret;
1384         }
1385
1386         /**
1387          * Get the content that needs to be saved in order to undo all revisions
1388          * between $undo and $undoafter. Revisions must belong to the same page,
1389          * must exist and must not be deleted
1390          * @param Revision $undo
1391          * @param Revision $undoafter Must be an earlier revision than $undo
1392          * @return Content|bool Content on success, false on failure
1393          * @since 1.21
1394          * Before we had the Content object, this was done in getUndoText
1395          */
1396         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1397                 $handler = $undo->getContentHandler();
1398                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1399         }
1400
1401         /**
1402          * Returns true if this page's content model supports sections.
1403          *
1404          * @return bool
1405          *
1406          * @todo The skin should check this and not offer section functionality if
1407          *   sections are not supported.
1408          * @todo The EditPage should check this and not offer section functionality
1409          *   if sections are not supported.
1410          */
1411         public function supportsSections() {
1412                 return $this->getContentHandler()->supportsSections();
1413         }
1414
1415         /**
1416          * @param string|number|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 string $edittime Revision timestamp or null to use the current revision.
1422          *
1423          * @throws MWException
1424          * @return Content|null New complete article content, or null if error.
1425          *
1426          * @since 1.21
1427          * @deprecated since 1.24, use replaceSectionAtRev instead
1428          */
1429         public function replaceSectionContent(
1430                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1431         ) {
1432
1433                 $baseRevId = null;
1434                 if ( $edittime && $sectionId !== 'new' ) {
1435                         $dbr = wfGetDB( DB_REPLICA );
1436                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1437                         // Try the master if this thread may have just added it.
1438                         // This could be abstracted into a Revision method, but we don't want
1439                         // to encourage loading of revisions by timestamp.
1440                         if ( !$rev
1441                                 && wfGetLB()->getServerCount() > 1
1442                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1443                         ) {
1444                                 $dbw = wfGetDB( DB_MASTER );
1445                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1446                         }
1447                         if ( $rev ) {
1448                                 $baseRevId = $rev->getId();
1449                         }
1450                 }
1451
1452                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1453         }
1454
1455         /**
1456          * @param string|number|null|bool $sectionId Section identifier as a number or string
1457          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1458          * or 'new' for a new section.
1459          * @param Content $sectionContent New content of the section.
1460          * @param string $sectionTitle New section's subject, only if $section is "new".
1461          * @param int|null $baseRevId
1462          *
1463          * @throws MWException
1464          * @return Content|null New complete article content, or null if error.
1465          *
1466          * @since 1.24
1467          */
1468         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1469                 $sectionTitle = '', $baseRevId = null
1470         ) {
1471
1472                 if ( strval( $sectionId ) === '' ) {
1473                         // Whole-page edit; let the whole text through
1474                         $newContent = $sectionContent;
1475                 } else {
1476                         if ( !$this->supportsSections() ) {
1477                                 throw new MWException( "sections not supported for content model " .
1478                                         $this->getContentHandler()->getModelID() );
1479                         }
1480
1481                         // Bug 30711: always use current version when adding a new section
1482                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1483                                 $oldContent = $this->getContent();
1484                         } else {
1485                                 $rev = Revision::newFromId( $baseRevId );
1486                                 if ( !$rev ) {
1487                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1488                                                 $this->getId() . "; section: $sectionId)\n" );
1489                                         return null;
1490                                 }
1491
1492                                 $oldContent = $rev->getContent();
1493                         }
1494
1495                         if ( !$oldContent ) {
1496                                 wfDebug( __METHOD__ . ": no page text\n" );
1497                                 return null;
1498                         }
1499
1500                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1501                 }
1502
1503                 return $newContent;
1504         }
1505
1506         /**
1507          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1508          * @param int $flags
1509          * @return int Updated $flags
1510          */
1511         public function checkFlags( $flags ) {
1512                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1513                         if ( $this->exists() ) {
1514                                 $flags |= EDIT_UPDATE;
1515                         } else {
1516                                 $flags |= EDIT_NEW;
1517                         }
1518                 }
1519
1520                 return $flags;
1521         }
1522
1523         /**
1524          * Change an existing article or create a new article. Updates RC and all necessary caches,
1525          * optionally via the deferred update array.
1526          *
1527          * @param string $text New text
1528          * @param string $summary Edit summary
1529          * @param int $flags Bitfield:
1530          *      EDIT_NEW
1531          *          Article is known or assumed to be non-existent, create a new one
1532          *      EDIT_UPDATE
1533          *          Article is known or assumed to be pre-existing, update it
1534          *      EDIT_MINOR
1535          *          Mark this edit minor, if the user is allowed to do so
1536          *      EDIT_SUPPRESS_RC
1537          *          Do not log the change in recentchanges
1538          *      EDIT_FORCE_BOT
1539          *          Mark the edit a "bot" edit regardless of user rights
1540          *      EDIT_AUTOSUMMARY
1541          *          Fill in blank summaries with generated text where possible
1542          *      EDIT_INTERNAL
1543          *          Signal that the page retrieve/save cycle happened entirely in this request.
1544          *
1545          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1546          * article will be detected. If EDIT_UPDATE is specified and the article
1547          * doesn't exist, the function will return an edit-gone-missing error. If
1548          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1549          * error will be returned. These two conditions are also possible with
1550          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1551          *
1552          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1553          *   This is not the parent revision ID, rather the revision ID for older
1554          *   content used as the source for a rollback, for example.
1555          * @param User $user The user doing the edit
1556          *
1557          * @throws MWException
1558          * @return Status Possible errors:
1559          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1560          *     set the fatal flag of $status
1561          *   edit-gone-missing: In update mode, but the article didn't exist.
1562          *   edit-conflict: In update mode, the article changed unexpectedly.
1563          *   edit-no-change: Warning that the text was the same as before.
1564          *   edit-already-exists: In creation mode, but the article already exists.
1565          *
1566          * Extensions may define additional errors.
1567          *
1568          * $return->value will contain an associative array with members as follows:
1569          *     new: Boolean indicating if the function attempted to create a new article.
1570          *     revision: The revision object for the inserted revision, or null.
1571          *
1572          * Compatibility note: this function previously returned a boolean value
1573          * indicating success/failure
1574          *
1575          * @deprecated since 1.21: use doEditContent() instead.
1576          */
1577         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1578                 wfDeprecated( __METHOD__, '1.21' );
1579
1580                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1581
1582                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1583         }
1584
1585         /**
1586          * Change an existing article or create a new article. Updates RC and all necessary caches,
1587          * optionally via the deferred update array.
1588          *
1589          * @param Content $content New content
1590          * @param string $summary Edit summary
1591          * @param int $flags Bitfield:
1592          *      EDIT_NEW
1593          *          Article is known or assumed to be non-existent, create a new one
1594          *      EDIT_UPDATE
1595          *          Article is known or assumed to be pre-existing, update it
1596          *      EDIT_MINOR
1597          *          Mark this edit minor, if the user is allowed to do so
1598          *      EDIT_SUPPRESS_RC
1599          *          Do not log the change in recentchanges
1600          *      EDIT_FORCE_BOT
1601          *          Mark the edit a "bot" edit regardless of user rights
1602          *      EDIT_AUTOSUMMARY
1603          *          Fill in blank summaries with generated text where possible
1604          *      EDIT_INTERNAL
1605          *          Signal that the page retrieve/save cycle happened entirely in this request.
1606          *
1607          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1608          * article will be detected. If EDIT_UPDATE is specified and the article
1609          * doesn't exist, the function will return an edit-gone-missing error. If
1610          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1611          * error will be returned. These two conditions are also possible with
1612          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1613          *
1614          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1615          *   This is not the parent revision ID, rather the revision ID for older
1616          *   content used as the source for a rollback, for example.
1617          * @param User $user The user doing the edit
1618          * @param string $serialFormat Format for storing the content in the
1619          *   database.
1620          * @param array|null $tags Change tags to apply to this edit
1621          * Callers are responsible for permission checks
1622          * (with ChangeTags::canAddTagsAccompanyingChange)
1623          *
1624          * @throws MWException
1625          * @return Status Possible errors:
1626          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1627          *       set the fatal flag of $status.
1628          *     edit-gone-missing: In update mode, but the article didn't exist.
1629          *     edit-conflict: In update mode, the article changed unexpectedly.
1630          *     edit-no-change: Warning that the text was the same as before.
1631          *     edit-already-exists: In creation mode, but the article already exists.
1632          *
1633          *  Extensions may define additional errors.
1634          *
1635          *  $return->value will contain an associative array with members as follows:
1636          *     new: Boolean indicating if the function attempted to create a new article.
1637          *     revision: The revision object for the inserted revision, or null.
1638          *
1639          * @since 1.21
1640          * @throws MWException
1641          */
1642         public function doEditContent(
1643                 Content $content, $summary, $flags = 0, $baseRevId = false,
1644                 User $user = null, $serialFormat = null, $tags = []
1645         ) {
1646                 global $wgUser, $wgUseAutomaticEditSummaries;
1647
1648                 // Old default parameter for $tags was null
1649                 if ( $tags === null ) {
1650                         $tags = [];
1651                 }
1652
1653                 // Low-level sanity check
1654                 if ( $this->mTitle->getText() === '' ) {
1655                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1656                 }
1657                 // Make sure the given content type is allowed for this page
1658                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1659                         return Status::newFatal( 'content-not-allowed-here',
1660                                 ContentHandler::getLocalizedName( $content->getModel() ),
1661                                 $this->mTitle->getPrefixedText()
1662                         );
1663                 }
1664
1665                 // Load the data from the master database if needed.
1666                 // The caller may already loaded it from the master or even loaded it using
1667                 // SELECT FOR UPDATE, so do not override that using clear().
1668                 $this->loadPageData( 'fromdbmaster' );
1669
1670                 $user = $user ?: $wgUser;
1671                 $flags = $this->checkFlags( $flags );
1672
1673                 // Trigger pre-save hook (using provided edit summary)
1674                 $hookStatus = Status::newGood( [] );
1675                 $hook_args = [ &$this, &$user, &$content, &$summary,
1676                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1677                 // Check if the hook rejected the attempted save
1678                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1679                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args, '1.21' )
1680                 ) {
1681                         if ( $hookStatus->isOK() ) {
1682                                 // Hook returned false but didn't call fatal(); use generic message
1683                                 $hookStatus->fatal( 'edit-hook-aborted' );
1684                         }
1685
1686                         return $hookStatus;
1687                 }
1688
1689                 $old_revision = $this->getRevision(); // current revision
1690                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1691
1692                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1693                         $tags[] = 'mw-contentmodelchange';
1694                 }
1695
1696                 // Provide autosummaries if one is not provided and autosummaries are enabled
1697                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1698                         $handler = $content->getContentHandler();
1699                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1700                 }
1701
1702                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1703                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1704                         $useCache = false;
1705                 } else {
1706                         $useCache = true;
1707                 }
1708
1709                 // Get the pre-save transform content and final parser output
1710                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1711                 $pstContent = $editInfo->pstContent; // Content object
1712                 $meta = [
1713                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1714                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1715                         'serialized' => $editInfo->pst,
1716                         'serialFormat' => $serialFormat,
1717                         'baseRevId' => $baseRevId,
1718                         'oldRevision' => $old_revision,
1719                         'oldContent' => $old_content,
1720                         'oldId' => $this->getLatest(),
1721                         'oldIsRedirect' => $this->isRedirect(),
1722                         'oldCountable' => $this->isCountable(),
1723                         'tags' => ( $tags !== null ) ? (array)$tags : []
1724                 ];
1725
1726                 // Actually create the revision and create/update the page
1727                 if ( $flags & EDIT_UPDATE ) {
1728                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1729                 } else {
1730                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1731                 }
1732
1733                 // Promote user to any groups they meet the criteria for
1734                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1735                         $user->addAutopromoteOnceGroups( 'onEdit' );
1736                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1737                 } );
1738
1739                 return $status;
1740         }
1741
1742         /**
1743          * @param Content $content Pre-save transform content
1744          * @param integer $flags
1745          * @param User $user
1746          * @param string $summary
1747          * @param array $meta
1748          * @return Status
1749          * @throws DBUnexpectedError
1750          * @throws Exception
1751          * @throws FatalError
1752          * @throws MWException
1753          */
1754         private function doModify(
1755                 Content $content, $flags, User $user, $summary, array $meta
1756         ) {
1757                 global $wgUseRCPatrol;
1758
1759                 // Update article, but only if changed.
1760                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1761
1762                 // Convenience variables
1763                 $now = wfTimestampNow();
1764                 $oldid = $meta['oldId'];
1765                 /** @var $oldContent Content|null */
1766                 $oldContent = $meta['oldContent'];
1767                 $newsize = $content->getSize();
1768
1769                 if ( !$oldid ) {
1770                         // Article gone missing
1771                         $status->fatal( 'edit-gone-missing' );
1772
1773                         return $status;
1774                 } elseif ( !$oldContent ) {
1775                         // Sanity check for bug 37225
1776                         throw new MWException( "Could not find text for current revision {$oldid}." );
1777                 }
1778
1779                 // @TODO: pass content object?!
1780                 $revision = new Revision( [
1781                         'page'       => $this->getId(),
1782                         'title'      => $this->mTitle, // for determining the default content model
1783                         'comment'    => $summary,
1784                         'minor_edit' => $meta['minor'],
1785                         'text'       => $meta['serialized'],
1786                         'len'        => $newsize,
1787                         'parent_id'  => $oldid,
1788                         'user'       => $user->getId(),
1789                         'user_text'  => $user->getName(),
1790                         'timestamp'  => $now,
1791                         'content_model' => $content->getModel(),
1792                         'content_format' => $meta['serialFormat'],
1793                 ] );
1794
1795                 $changed = !$content->equals( $oldContent );
1796
1797                 $dbw = wfGetDB( DB_MASTER );
1798
1799                 if ( $changed ) {
1800                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1801                         $status->merge( $prepStatus );
1802                         if ( !$status->isOK() ) {
1803                                 return $status;
1804                         }
1805
1806                         $dbw->startAtomic( __METHOD__ );
1807                         // Get the latest page_latest value while locking it.
1808                         // Do a CAS style check to see if it's the same as when this method
1809                         // started. If it changed then bail out before touching the DB.
1810                         $latestNow = $this->lockAndGetLatest();
1811                         if ( $latestNow != $oldid ) {
1812                                 $dbw->endAtomic( __METHOD__ );
1813                                 // Page updated or deleted in the mean time
1814                                 $status->fatal( 'edit-conflict' );
1815
1816                                 return $status;
1817                         }
1818
1819                         // At this point we are now comitted to returning an OK
1820                         // status unless some DB query error or other exception comes up.
1821                         // This way callers don't have to call rollback() if $status is bad
1822                         // unless they actually try to catch exceptions (which is rare).
1823
1824                         // Save the revision text
1825                         $revisionId = $revision->insertOn( $dbw );
1826                         // Update page_latest and friends to reflect the new revision
1827                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1828                                 throw new MWException( "Failed to update page row to use new revision." );
1829                         }
1830
1831                         Hooks::run( 'NewRevisionFromEditComplete',
1832                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1833
1834                         // Update recentchanges
1835                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1836                                 // Mark as patrolled if the user can do so
1837                                 $patrolled = $wgUseRCPatrol && !count(
1838                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1839                                 // Add RC row to the DB
1840                                 RecentChange::notifyEdit(
1841                                         $now,
1842                                         $this->mTitle,
1843                                         $revision->isMinor(),
1844                                         $user,
1845                                         $summary,
1846                                         $oldid,
1847                                         $this->getTimestamp(),
1848                                         $meta['bot'],
1849                                         '',
1850                                         $oldContent ? $oldContent->getSize() : 0,
1851                                         $newsize,
1852                                         $revisionId,
1853                                         $patrolled,
1854                                         $meta['tags']
1855                                 );
1856                         }
1857
1858                         $user->incEditCount();
1859
1860                         $dbw->endAtomic( __METHOD__ );
1861                         $this->mTimestamp = $now;
1862                 } else {
1863                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1864                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1865                         $revision->setId( $this->getLatest() );
1866                         $revision->setUserIdAndName(
1867                                 $this->getUser( Revision::RAW ),
1868                                 $this->getUserText( Revision::RAW )
1869                         );
1870                 }
1871
1872                 if ( $changed ) {
1873                         // Return the new revision to the caller
1874                         $status->value['revision'] = $revision;
1875                 } else {
1876                         $status->warning( 'edit-no-change' );
1877                         // Update page_touched as updateRevisionOn() was not called.
1878                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1879                         $this->mTitle->invalidateCache( $now );
1880                 }
1881
1882                 // Do secondary updates once the main changes have been committed...
1883                 DeferredUpdates::addUpdate(
1884                         new AtomicSectionUpdate(
1885                                 $dbw,
1886                                 __METHOD__,
1887                                 function () use (
1888                                         $revision, &$user, $content, $summary, &$flags,
1889                                         $changed, $meta, &$status
1890                                 ) {
1891                                         // Update links tables, site stats, etc.
1892                                         $this->doEditUpdates(
1893                                                 $revision,
1894                                                 $user,
1895                                                 [
1896                                                         'changed' => $changed,
1897                                                         'oldcountable' => $meta['oldCountable'],
1898                                                         'oldrevision' => $meta['oldRevision']
1899                                                 ]
1900                                         );
1901                                         // Trigger post-save hook
1902                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1903                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1904                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1905                                         Hooks::run( 'PageContentSaveComplete', $params );
1906                                 }
1907                         ),
1908                         DeferredUpdates::PRESEND
1909                 );
1910
1911                 return $status;
1912         }
1913
1914         /**
1915          * @param Content $content Pre-save transform content
1916          * @param integer $flags
1917          * @param User $user
1918          * @param string $summary
1919          * @param array $meta
1920          * @return Status
1921          * @throws DBUnexpectedError
1922          * @throws Exception
1923          * @throws FatalError
1924          * @throws MWException
1925          */
1926         private function doCreate(
1927                 Content $content, $flags, User $user, $summary, array $meta
1928         ) {
1929                 global $wgUseRCPatrol, $wgUseNPPatrol;
1930
1931                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1932
1933                 $now = wfTimestampNow();
1934                 $newsize = $content->getSize();
1935                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1936                 $status->merge( $prepStatus );
1937                 if ( !$status->isOK() ) {
1938                         return $status;
1939                 }
1940
1941                 $dbw = wfGetDB( DB_MASTER );
1942                 $dbw->startAtomic( __METHOD__ );
1943
1944                 // Add the page record unless one already exists for the title
1945                 $newid = $this->insertOn( $dbw );
1946                 if ( $newid === false ) {
1947                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1948                         $status->fatal( 'edit-already-exists' );
1949
1950                         return $status; // nothing done
1951                 }
1952
1953                 // At this point we are now comitted to returning an OK
1954                 // status unless some DB query error or other exception comes up.
1955                 // This way callers don't have to call rollback() if $status is bad
1956                 // unless they actually try to catch exceptions (which is rare).
1957
1958                 // @TODO: pass content object?!
1959                 $revision = new Revision( [
1960                         'page'       => $newid,
1961                         'title'      => $this->mTitle, // for determining the default content model
1962                         'comment'    => $summary,
1963                         'minor_edit' => $meta['minor'],
1964                         'text'       => $meta['serialized'],
1965                         'len'        => $newsize,
1966                         'user'       => $user->getId(),
1967                         'user_text'  => $user->getName(),
1968                         'timestamp'  => $now,
1969                         'content_model' => $content->getModel(),
1970                         'content_format' => $meta['serialFormat'],
1971                 ] );
1972
1973                 // Save the revision text...
1974                 $revisionId = $revision->insertOn( $dbw );
1975                 // Update the page record with revision data
1976                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1977                         throw new MWException( "Failed to update page row to use new revision." );
1978                 }
1979
1980                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1981
1982                 // Update recentchanges
1983                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1984                         // Mark as patrolled if the user can do so
1985                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1986                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1987                         // Add RC row to the DB
1988                         RecentChange::notifyNew(
1989                                 $now,
1990                                 $this->mTitle,
1991                                 $revision->isMinor(),
1992                                 $user,
1993                                 $summary,
1994                                 $meta['bot'],
1995                                 '',
1996                                 $newsize,
1997                                 $revisionId,
1998                                 $patrolled,
1999                                 $meta['tags']
2000                         );
2001                 }
2002
2003                 $user->incEditCount();
2004
2005                 $dbw->endAtomic( __METHOD__ );
2006                 $this->mTimestamp = $now;
2007
2008                 // Return the new revision to the caller
2009                 $status->value['revision'] = $revision;
2010
2011                 // Do secondary updates once the main changes have been committed...
2012                 DeferredUpdates::addUpdate(
2013                         new AtomicSectionUpdate(
2014                                 $dbw,
2015                                 __METHOD__,
2016                                 function () use (
2017                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
2018                                 ) {
2019                                         // Update links, etc.
2020                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
2021                                         // Trigger post-create hook
2022                                         $params = [ &$this, &$user, $content, $summary,
2023                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2024                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params, '1.21' );
2025                                         Hooks::run( 'PageContentInsertComplete', $params );
2026                                         // Trigger post-save hook
2027                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2028                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params, '1.21' );
2029                                         Hooks::run( 'PageContentSaveComplete', $params );
2030
2031                                 }
2032                         ),
2033                         DeferredUpdates::PRESEND
2034                 );
2035
2036                 return $status;
2037         }
2038
2039         /**
2040          * Get parser options suitable for rendering the primary article wikitext
2041          *
2042          * @see ContentHandler::makeParserOptions
2043          *
2044          * @param IContextSource|User|string $context One of the following:
2045          *        - IContextSource: Use the User and the Language of the provided
2046          *          context
2047          *        - User: Use the provided User object and $wgLang for the language,
2048          *          so use an IContextSource object if possible.
2049          *        - 'canonical': Canonical options (anonymous user with default
2050          *          preferences and content language).
2051          * @return ParserOptions
2052          */
2053         public function makeParserOptions( $context ) {
2054                 $options = $this->getContentHandler()->makeParserOptions( $context );
2055
2056                 if ( $this->getTitle()->isConversionTable() ) {
2057                         // @todo ConversionTable should become a separate content model, so
2058                         // we don't need special cases like this one.
2059                         $options->disableContentConversion();
2060                 }
2061
2062                 return $options;
2063         }
2064
2065         /**
2066          * Prepare text which is about to be saved.
2067          * Returns a stdClass with source, pst and output members
2068          *
2069          * @param string $text
2070          * @param int|null $revid
2071          * @param User|null $user
2072          * @deprecated since 1.21: use prepareContentForEdit instead.
2073          * @return object
2074          */
2075         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2076                 wfDeprecated( __METHOD__, '1.21' );
2077                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2078                 return $this->prepareContentForEdit( $content, $revid, $user );
2079         }
2080
2081         /**
2082          * Prepare content which is about to be saved.
2083          * Returns a stdClass with source, pst and output members
2084          *
2085          * @param Content $content
2086          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2087          *        revision ID is also accepted, but this is deprecated.
2088          * @param User|null $user
2089          * @param string|null $serialFormat
2090          * @param bool $useCache Check shared prepared edit cache
2091          *
2092          * @return object
2093          *
2094          * @since 1.21
2095          */
2096         public function prepareContentForEdit(
2097                 Content $content, $revision = null, User $user = null,
2098                 $serialFormat = null, $useCache = true
2099         ) {
2100                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2101
2102                 if ( is_object( $revision ) ) {
2103                         $revid = $revision->getId();
2104                 } else {
2105                         $revid = $revision;
2106                         // This code path is deprecated, and nothing is known to
2107                         // use it, so performance here shouldn't be a worry.
2108                         if ( $revid !== null ) {
2109                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2110                         } else {
2111                                 $revision = null;
2112                         }
2113                 }
2114
2115                 $user = is_null( $user ) ? $wgUser : $user;
2116                 // XXX: check $user->getId() here???
2117
2118                 // Use a sane default for $serialFormat, see bug 57026
2119                 if ( $serialFormat === null ) {
2120                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2121                 }
2122
2123                 if ( $this->mPreparedEdit
2124                         && isset( $this->mPreparedEdit->newContent )
2125                         && $this->mPreparedEdit->newContent->equals( $content )
2126                         && $this->mPreparedEdit->revid == $revid
2127                         && $this->mPreparedEdit->format == $serialFormat
2128                         // XXX: also check $user here?
2129                 ) {
2130                         // Already prepared
2131                         return $this->mPreparedEdit;
2132                 }
2133
2134                 // The edit may have already been prepared via api.php?action=stashedit
2135                 $cachedEdit = $useCache && $wgAjaxEditStash
2136                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2137                         : false;
2138
2139                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2140                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2141
2142                 $edit = (object)[];
2143                 if ( $cachedEdit ) {
2144                         $edit->timestamp = $cachedEdit->timestamp;
2145                 } else {
2146                         $edit->timestamp = wfTimestampNow();
2147                 }
2148                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2149                 $edit->revid = $revid;
2150
2151                 if ( $cachedEdit ) {
2152                         $edit->pstContent = $cachedEdit->pstContent;
2153                 } else {
2154                         $edit->pstContent = $content
2155                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2156                                 : null;
2157                 }
2158
2159                 $edit->format = $serialFormat;
2160                 $edit->popts = $this->makeParserOptions( 'canonical' );
2161                 if ( $cachedEdit ) {
2162                         $edit->output = $cachedEdit->output;
2163                 } else {
2164                         if ( $revision ) {
2165                                 // We get here if vary-revision is set. This means that this page references
2166                                 // itself (such as via self-transclusion). In this case, we need to make sure
2167                                 // that any such self-references refer to the newly-saved revision, and not
2168                                 // to the previous one, which could otherwise happen due to replica DB lag.
2169                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2170                                 $edit->popts->setCurrentRevisionCallback(
2171                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2172                                                 if ( $title->equals( $revision->getTitle() ) ) {
2173                                                         return $revision;
2174                                                 } else {
2175                                                         return call_user_func( $oldCallback, $title, $parser );
2176                                                 }
2177                                         }
2178                                 );
2179                         } else {
2180                                 // Try to avoid a second parse if {{REVISIONID}} is used
2181                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2182                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2183                                                 'revision',
2184                                                 'MAX(rev_id)',
2185                                                 [],
2186                                                 __METHOD__
2187                                         );
2188                                 } );
2189                         }
2190                         $edit->output = $edit->pstContent
2191                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2192                                 : null;
2193                 }
2194
2195                 $edit->newContent = $content;
2196                 $edit->oldContent = $this->getContent( Revision::RAW );
2197
2198                 // NOTE: B/C for hooks! don't use these fields!
2199                 $edit->newText = $edit->newContent
2200                         ? ContentHandler::getContentText( $edit->newContent )
2201                         : '';
2202                 $edit->oldText = $edit->oldContent
2203                         ? ContentHandler::getContentText( $edit->oldContent )
2204                         : '';
2205                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2206
2207                 if ( $edit->output ) {
2208                         $edit->output->setCacheTime( wfTimestampNow() );
2209                 }
2210
2211                 // Process cache the result
2212                 $this->mPreparedEdit = $edit;
2213
2214                 return $edit;
2215         }
2216
2217         /**
2218          * Do standard deferred updates after page edit.
2219          * Update links tables, site stats, search index and message cache.
2220          * Purges pages that include this page if the text was changed here.
2221          * Every 100th edit, prune the recent changes table.
2222          *
2223          * @param Revision $revision
2224          * @param User $user User object that did the revision
2225          * @param array $options Array of options, following indexes are used:
2226          * - changed: boolean, whether the revision changed the content (default true)
2227          * - created: boolean, whether the revision created the page (default false)
2228          * - moved: boolean, whether the page was moved (default false)
2229          * - restored: boolean, whether the page was undeleted (default false)
2230          * - oldrevision: Revision object for the pre-update revision (default null)
2231          * - oldcountable: boolean, null, or string 'no-change' (default null):
2232          *   - boolean: whether the page was counted as an article before that
2233          *     revision, only used in changed is true and created is false
2234          *   - null: if created is false, don't update the article count; if created
2235          *     is true, do update the article count
2236          *   - 'no-change': don't update the article count, ever
2237          */
2238         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2239                 global $wgRCWatchCategoryMembership;
2240
2241                 $options += [
2242                         'changed' => true,
2243                         'created' => false,
2244                         'moved' => false,
2245                         'restored' => false,
2246                         'oldrevision' => null,
2247                         'oldcountable' => null
2248                 ];
2249                 $content = $revision->getContent();
2250
2251                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2252
2253                 // See if the parser output before $revision was inserted is still valid
2254                 $editInfo = false;
2255                 if ( !$this->mPreparedEdit ) {
2256                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2257                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2258                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2259                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2260                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2261                 ) {
2262                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2263                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2264                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2265                 } else {
2266                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2267                         $editInfo = $this->mPreparedEdit;
2268                 }
2269
2270                 if ( !$editInfo ) {
2271                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2272                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2273                         // as any prepared content from there or in doEditContent() was already rejected.
2274                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2275                 }
2276
2277                 // Save it to the parser cache.
2278                 // Make sure the cache time matches page_touched to avoid double parsing.
2279                 ParserCache::singleton()->save(
2280                         $editInfo->output, $this, $editInfo->popts,
2281                         $revision->getTimestamp(), $editInfo->revid
2282                 );
2283
2284                 // Update the links tables and other secondary data
2285                 if ( $content ) {
2286                         $recursive = $options['changed']; // bug 50785
2287                         $updates = $content->getSecondaryDataUpdates(
2288                                 $this->getTitle(), null, $recursive, $editInfo->output
2289                         );
2290                         foreach ( $updates as $update ) {
2291                                 if ( $update instanceof LinksUpdate ) {
2292                                         $update->setRevision( $revision );
2293                                         $update->setTriggeringUser( $user );
2294                                 }
2295                                 DeferredUpdates::addUpdate( $update );
2296                         }
2297                         if ( $wgRCWatchCategoryMembership
2298                                 && $this->getContentHandler()->supportsCategories() === true
2299                                 && ( $options['changed'] || $options['created'] )
2300                                 && !$options['restored']
2301                         ) {
2302                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2303                                 // the recent change entry (also done via deferred updates) and carry over any
2304                                 // bot/deletion/IP flags, ect.
2305                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2306                                         $this->getTitle(),
2307                                         [
2308                                                 'pageId' => $this->getId(),
2309                                                 'revTimestamp' => $revision->getTimestamp()
2310                                         ]
2311                                 ) );
2312                         }
2313                 }
2314
2315                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2316
2317                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2318                         // Flush old entries from the `recentchanges` table
2319                         if ( mt_rand( 0, 9 ) == 0 ) {
2320                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2321                         }
2322                 }
2323
2324                 if ( !$this->exists() ) {
2325                         return;
2326                 }
2327
2328                 $id = $this->getId();
2329                 $title = $this->mTitle->getPrefixedDBkey();
2330                 $shortTitle = $this->mTitle->getDBkey();
2331
2332                 if ( $options['oldcountable'] === 'no-change' ||
2333                         ( !$options['changed'] && !$options['moved'] )
2334                 ) {
2335                         $good = 0;
2336                 } elseif ( $options['created'] ) {
2337                         $good = (int)$this->isCountable( $editInfo );
2338                 } elseif ( $options['oldcountable'] !== null ) {
2339                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2340                 } else {
2341                         $good = 0;
2342                 }
2343                 $edits = $options['changed'] ? 1 : 0;
2344                 $total = $options['created'] ? 1 : 0;
2345
2346                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2347                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2348
2349                 // If this is another user's talk page, update newtalk.
2350                 // Don't do this if $options['changed'] = false (null-edits) nor if
2351                 // it's a minor edit and the user doesn't want notifications for those.
2352                 if ( $options['changed']
2353                         && $this->mTitle->getNamespace() == NS_USER_TALK
2354                         && $shortTitle != $user->getTitleKey()
2355                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2356                 ) {
2357                         $recipient = User::newFromName( $shortTitle, false );
2358                         if ( !$recipient ) {
2359                                 wfDebug( __METHOD__ . ": invalid username\n" );
2360                         } else {
2361                                 // Allow extensions to prevent user notification
2362                                 // when a new message is added to their talk page
2363                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2364                                         if ( User::isIP( $shortTitle ) ) {
2365                                                 // An anonymous user
2366                                                 $recipient->setNewtalk( true, $revision );
2367                                         } elseif ( $recipient->isLoggedIn() ) {
2368                                                 $recipient->setNewtalk( true, $revision );
2369                                         } else {
2370                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2371                                         }
2372                                 }
2373                         }
2374                 }
2375
2376                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2377                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2378                 }
2379
2380                 if ( $options['created'] ) {
2381                         self::onArticleCreate( $this->mTitle );
2382                 } elseif ( $options['changed'] ) { // bug 50785
2383                         self::onArticleEdit( $this->mTitle, $revision );
2384                 }
2385
2386                 ResourceLoaderWikiModule::invalidateModuleCache(
2387                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2388                 );
2389         }
2390
2391         /**
2392          * Update the article's restriction field, and leave a log entry.
2393          * This works for protection both existing and non-existing pages.
2394          *
2395          * @param array $limit Set of restriction keys
2396          * @param array $expiry Per restriction type expiration
2397          * @param int &$cascade Set to false if cascading protection isn't allowed.
2398          * @param string $reason
2399          * @param User $user The user updating the restrictions
2400          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2401          *   ($user should be able to add the specified tags before this is called)
2402          * @return Status Status object; if action is taken, $status->value is the log_id of the
2403          *   protection log entry.
2404          */
2405         public function doUpdateRestrictions( array $limit, array $expiry,
2406                 &$cascade, $reason, User $user, $tags = null
2407         ) {
2408                 global $wgCascadingRestrictionLevels, $wgContLang;
2409
2410                 if ( wfReadOnly() ) {
2411                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2412                 }
2413
2414                 $this->loadPageData( 'fromdbmaster' );
2415                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2416                 $id = $this->getId();
2417
2418                 if ( !$cascade ) {
2419                         $cascade = false;
2420                 }
2421
2422                 // Take this opportunity to purge out expired restrictions
2423                 Title::purgeExpiredRestrictions();
2424
2425                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2426                 // we expect a single selection, but the schema allows otherwise.
2427                 $isProtected = false;
2428                 $protect = false;
2429                 $changed = false;
2430
2431                 $dbw = wfGetDB( DB_MASTER );
2432
2433                 foreach ( $restrictionTypes as $action ) {
2434                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2435                                 $expiry[$action] = 'infinity';
2436                         }
2437                         if ( !isset( $limit[$action] ) ) {
2438                                 $limit[$action] = '';
2439                         } elseif ( $limit[$action] != '' ) {
2440                                 $protect = true;
2441                         }
2442
2443                         // Get current restrictions on $action
2444                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2445                         if ( $current != '' ) {
2446                                 $isProtected = true;
2447                         }
2448
2449                         if ( $limit[$action] != $current ) {
2450                                 $changed = true;
2451                         } elseif ( $limit[$action] != '' ) {
2452                                 // Only check expiry change if the action is actually being
2453                                 // protected, since expiry does nothing on an not-protected
2454                                 // action.
2455                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2456                                         $changed = true;
2457                                 }
2458                         }
2459                 }
2460
2461                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2462                         $changed = true;
2463                 }
2464
2465                 // If nothing has changed, do nothing
2466                 if ( !$changed ) {
2467                         return Status::newGood();
2468                 }
2469
2470                 if ( !$protect ) { // No protection at all means unprotection
2471                         $revCommentMsg = 'unprotectedarticle-comment';
2472                         $logAction = 'unprotect';
2473                 } elseif ( $isProtected ) {
2474                         $revCommentMsg = 'modifiedarticleprotection-comment';
2475                         $logAction = 'modify';
2476                 } else {
2477                         $revCommentMsg = 'protectedarticle-comment';
2478                         $logAction = 'protect';
2479                 }
2480
2481                 // Truncate for whole multibyte characters
2482                 $reason = $wgContLang->truncate( $reason, 255 );
2483
2484                 $logRelationsValues = [];
2485                 $logRelationsField = null;
2486                 $logParamsDetails = [];
2487
2488                 // Null revision (used for change tag insertion)
2489                 $nullRevision = null;
2490
2491                 if ( $id ) { // Protection of existing page
2492                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2493                                 return Status::newGood();
2494                         }
2495
2496                         // Only certain restrictions can cascade...
2497                         $editrestriction = isset( $limit['edit'] )
2498                                 ? [ $limit['edit'] ]
2499                                 : $this->mTitle->getRestrictions( 'edit' );
2500                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2501                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2502                         }
2503                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2504                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2505                         }
2506
2507                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2508                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2509                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2510                         }
2511                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2512                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2513                         }
2514
2515                         // The schema allows multiple restrictions
2516                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2517                                 $cascade = false;
2518                         }
2519
2520                         // insert null revision to identify the page protection change as edit summary
2521                         $latest = $this->getLatest();
2522                         $nullRevision = $this->insertProtectNullRevision(
2523                                 $revCommentMsg,
2524                                 $limit,
2525                                 $expiry,
2526                                 $cascade,
2527                                 $reason,
2528                                 $user
2529                         );
2530
2531                         if ( $nullRevision === null ) {
2532                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2533                         }
2534
2535                         $logRelationsField = 'pr_id';
2536
2537                         // Update restrictions table
2538                         foreach ( $limit as $action => $restrictions ) {
2539                                 $dbw->delete(
2540                                         'page_restrictions',
2541                                         [
2542                                                 'pr_page' => $id,
2543                                                 'pr_type' => $action
2544                                         ],
2545                                         __METHOD__
2546                                 );
2547                                 if ( $restrictions != '' ) {
2548                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2549                                         $dbw->insert(
2550                                                 'page_restrictions',
2551                                                 [
2552                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2553                                                         'pr_page' => $id,
2554                                                         'pr_type' => $action,
2555                                                         'pr_level' => $restrictions,
2556                                                         'pr_cascade' => $cascadeValue,
2557                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2558                                                 ],
2559                                                 __METHOD__
2560                                         );
2561                                         $logRelationsValues[] = $dbw->insertId();
2562                                         $logParamsDetails[] = [
2563                                                 'type' => $action,
2564                                                 'level' => $restrictions,
2565                                                 'expiry' => $expiry[$action],
2566                                                 'cascade' => (bool)$cascadeValue,
2567                                         ];
2568                                 }
2569                         }
2570
2571                         // Clear out legacy restriction fields
2572                         $dbw->update(
2573                                 'page',
2574                                 [ 'page_restrictions' => '' ],
2575                                 [ 'page_id' => $id ],
2576                                 __METHOD__
2577                         );
2578
2579                         Hooks::run( 'NewRevisionFromEditComplete',
2580                                 [ $this, $nullRevision, $latest, $user ] );
2581                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2582                 } else { // Protection of non-existing page (also known as "title protection")
2583                         // Cascade protection is meaningless in this case
2584                         $cascade = false;
2585
2586                         if ( $limit['create'] != '' ) {
2587                                 $dbw->replace( 'protected_titles',
2588                                         [ [ 'pt_namespace', 'pt_title' ] ],
2589                                         [
2590                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2591                                                 'pt_title' => $this->mTitle->getDBkey(),
2592                                                 'pt_create_perm' => $limit['create'],
2593                                                 'pt_timestamp' => $dbw->timestamp(),
2594                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2595                                                 'pt_user' => $user->getId(),
2596                                                 'pt_reason' => $reason,
2597                                         ], __METHOD__
2598                                 );
2599                                 $logParamsDetails[] = [
2600                                         'type' => 'create',
2601                                         'level' => $limit['create'],
2602                                         'expiry' => $expiry['create'],
2603                                 ];
2604                         } else {
2605                                 $dbw->delete( 'protected_titles',
2606                                         [
2607                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2608                                                 'pt_title' => $this->mTitle->getDBkey()
2609                                         ], __METHOD__
2610                                 );
2611                         }
2612                 }
2613
2614                 $this->mTitle->flushRestrictions();
2615                 InfoAction::invalidateCache( $this->mTitle );
2616
2617                 if ( $logAction == 'unprotect' ) {
2618                         $params = [];
2619                 } else {
2620                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2621                         $params = [
2622                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2623                                 '5:bool:cascade' => $cascade,
2624                                 'details' => $logParamsDetails, // parameter for localize and api
2625                         ];
2626                 }
2627
2628                 // Update the protection log
2629                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2630                 $logEntry->setTarget( $this->mTitle );
2631                 $logEntry->setComment( $reason );
2632                 $logEntry->setPerformer( $user );
2633                 $logEntry->setParameters( $params );
2634                 if ( !is_null( $nullRevision ) ) {
2635                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2636                 }
2637                 $logEntry->setTags( $tags );
2638                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2639                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2640                 }
2641                 $logId = $logEntry->insert();
2642                 $logEntry->publish( $logId );
2643
2644                 return Status::newGood( $logId );
2645         }
2646
2647         /**
2648          * Insert a new null revision for this page.
2649          *
2650          * @param string $revCommentMsg Comment message key for the revision
2651          * @param array $limit Set of restriction keys
2652          * @param array $expiry Per restriction type expiration
2653          * @param int $cascade Set to false if cascading protection isn't allowed.
2654          * @param string $reason
2655          * @param User|null $user
2656          * @return Revision|null Null on error
2657          */
2658         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2659                 array $expiry, $cascade, $reason, $user = null
2660         ) {
2661                 $dbw = wfGetDB( DB_MASTER );
2662
2663                 // Prepare a null revision to be added to the history
2664                 $editComment = wfMessage(
2665                         $revCommentMsg,
2666                         $this->mTitle->getPrefixedText(),
2667                         $user ? $user->getName() : ''
2668                 )->inContentLanguage()->text();
2669                 if ( $reason ) {
2670                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2671                 }
2672                 $protectDescription = $this->protectDescription( $limit, $expiry );
2673                 if ( $protectDescription ) {
2674                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2675                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2676                                 ->inContentLanguage()->text();
2677                 }
2678                 if ( $cascade ) {
2679                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2680                         $editComment .= wfMessage( 'brackets' )->params(
2681                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2682                         )->inContentLanguage()->text();
2683                 }
2684
2685                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2686                 if ( $nullRev ) {
2687                         $nullRev->insertOn( $dbw );
2688
2689                         // Update page record and touch page
2690                         $oldLatest = $nullRev->getParentId();
2691                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2692                 }
2693
2694                 return $nullRev;
2695         }
2696
2697         /**
2698          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2699          * @return string
2700          */
2701         protected function formatExpiry( $expiry ) {
2702                 global $wgContLang;
2703
2704                 if ( $expiry != 'infinity' ) {
2705                         return wfMessage(
2706                                 'protect-expiring',
2707                                 $wgContLang->timeanddate( $expiry, false, false ),
2708                                 $wgContLang->date( $expiry, false, false ),
2709                                 $wgContLang->time( $expiry, false, false )
2710                         )->inContentLanguage()->text();
2711                 } else {
2712                         return wfMessage( 'protect-expiry-indefinite' )
2713                                 ->inContentLanguage()->text();
2714                 }
2715         }
2716
2717         /**
2718          * Builds the description to serve as comment for the edit.
2719          *
2720          * @param array $limit Set of restriction keys
2721          * @param array $expiry Per restriction type expiration
2722          * @return string
2723          */
2724         public function protectDescription( array $limit, array $expiry ) {
2725                 $protectDescription = '';
2726
2727                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2728                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2729                         # All possible message keys are listed here for easier grepping:
2730                         # * restriction-create
2731                         # * restriction-edit
2732                         # * restriction-move
2733                         # * restriction-upload
2734                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2735                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2736                         # with '' filtered out. All possible message keys are listed below:
2737                         # * protect-level-autoconfirmed
2738                         # * protect-level-sysop
2739                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2740                                 ->inContentLanguage()->text();
2741
2742                         $expiryText = $this->formatExpiry( $expiry[$action] );
2743
2744                         if ( $protectDescription !== '' ) {
2745                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2746                         }
2747                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2748                                 ->params( $actionText, $restrictionsText, $expiryText )
2749                                 ->inContentLanguage()->text();
2750                 }
2751
2752                 return $protectDescription;
2753         }
2754
2755         /**
2756          * Builds the description to serve as comment for the log entry.
2757          *
2758          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2759          * protect description text. Keep them in old format to avoid breaking compatibility.
2760          * TODO: Fix protection log to store structured description and format it on-the-fly.
2761          *
2762          * @param array $limit Set of restriction keys
2763          * @param array $expiry Per restriction type expiration
2764          * @return string
2765          */
2766         public function protectDescriptionLog( array $limit, array $expiry ) {
2767                 global $wgContLang;
2768
2769                 $protectDescriptionLog = '';
2770
2771                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2772                         $expiryText = $this->formatExpiry( $expiry[$action] );
2773                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2774                                 "[$action=$restrictions] ($expiryText)";
2775                 }
2776
2777                 return trim( $protectDescriptionLog );
2778         }
2779
2780         /**
2781          * Take an array of page restrictions and flatten it to a string
2782          * suitable for insertion into the page_restrictions field.
2783          *
2784          * @param string[] $limit
2785          *
2786          * @throws MWException
2787          * @return string
2788          */
2789         protected static function flattenRestrictions( $limit ) {
2790                 if ( !is_array( $limit ) ) {
2791                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2792                 }
2793
2794                 $bits = [];
2795                 ksort( $limit );
2796
2797                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2798                         $bits[] = "$action=$restrictions";
2799                 }
2800
2801                 return implode( ':', $bits );
2802         }
2803
2804         /**
2805          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2806          * backwards compatibility, if you care about error reporting you should use
2807          * doDeleteArticleReal() instead.
2808          *
2809          * Deletes the article with database consistency, writes logs, purges caches
2810          *
2811          * @param string $reason Delete reason for deletion log
2812          * @param bool $suppress Suppress all revisions and log the deletion in
2813          *        the suppression log instead of the deletion log
2814          * @param int $u1 Unused
2815          * @param bool $u2 Unused
2816          * @param array|string &$error Array of errors to append to
2817          * @param User $user The deleting user
2818          * @return bool True if successful
2819          */
2820         public function doDeleteArticle(
2821                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2822         ) {
2823                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2824                 return $status->isGood();
2825         }
2826
2827         /**
2828          * Back-end article deletion
2829          * Deletes the article with database consistency, writes logs, purges caches
2830          *
2831          * @since 1.19
2832          *
2833          * @param string $reason Delete reason for deletion log
2834          * @param bool $suppress Suppress all revisions and log the deletion in
2835          *   the suppression log instead of the deletion log
2836          * @param int $u1 Unused
2837          * @param bool $u2 Unused
2838          * @param array|string &$error Array of errors to append to
2839          * @param User $user The deleting user
2840          * @param array $tags Tags to apply to the deletion action
2841          * @return Status Status object; if successful, $status->value is the log_id of the
2842          *   deletion log entry. If the page couldn't be deleted because it wasn't
2843          *   found, $status is a non-fatal 'cannotdelete' error
2844          */
2845         public function doDeleteArticleReal(
2846                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2847                 $tags = [], $logsubtype = 'delete'
2848         ) {
2849                 global $wgUser, $wgContentHandlerUseDB;
2850
2851                 wfDebug( __METHOD__ . "\n" );
2852
2853                 $status = Status::newGood();
2854
2855                 if ( $this->mTitle->getDBkey() === '' ) {
2856                         $status->error( 'cannotdelete',
2857                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2858                         return $status;
2859                 }
2860
2861                 $user = is_null( $user ) ? $wgUser : $user;
2862                 if ( !Hooks::run( 'ArticleDelete',
2863                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2864                 ) ) {
2865                         if ( $status->isOK() ) {
2866                                 // Hook aborted but didn't set a fatal status
2867                                 $status->fatal( 'delete-hook-aborted' );
2868                         }
2869                         return $status;
2870                 }
2871
2872                 $dbw = wfGetDB( DB_MASTER );
2873                 $dbw->startAtomic( __METHOD__ );
2874
2875                 $this->loadPageData( self::READ_LATEST );
2876                 $id = $this->getId();
2877                 // T98706: lock the page from various other updates but avoid using
2878                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2879                 // the revisions queries (which also JOIN on user). Only lock the page
2880                 // row and CAS check on page_latest to see if the trx snapshot matches.
2881                 $lockedLatest = $this->lockAndGetLatest();
2882                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2883                         $dbw->endAtomic( __METHOD__ );
2884                         // Page not there or trx snapshot is stale
2885                         $status->error( 'cannotdelete',
2886                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2887                         return $status;
2888                 }
2889
2890                 // Given the lock above, we can be confident in the title and page ID values
2891                 $namespace = $this->getTitle()->getNamespace();
2892                 $dbKey = $this->getTitle()->getDBkey();
2893
2894                 // At this point we are now comitted to returning an OK
2895                 // status unless some DB query error or other exception comes up.
2896                 // This way callers don't have to call rollback() if $status is bad
2897                 // unless they actually try to catch exceptions (which is rare).
2898
2899                 // we need to remember the old content so we can use it to generate all deletion updates.
2900                 $revision = $this->getRevision();
2901                 try {
2902                         $content = $this->getContent( Revision::RAW );
2903                 } catch ( Exception $ex ) {
2904                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2905                                 . $ex->getMessage() );
2906
2907                         $content = null;
2908                 }
2909
2910                 $fields = Revision::selectFields();
2911                 $bitfield = false;
2912
2913                 // Bitfields to further suppress the content
2914                 if ( $suppress ) {
2915                         $bitfield = Revision::SUPPRESSED_ALL;
2916                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2917                 }
2918
2919                 // For now, shunt the revision data into the archive table.
2920                 // Text is *not* removed from the text table; bulk storage
2921                 // is left intact to avoid breaking block-compression or
2922                 // immutable storage schemes.
2923                 // In the future, we may keep revisions and mark them with
2924                 // the rev_deleted field, which is reserved for this purpose.
2925
2926                 // Get all of the page revisions
2927                 $res = $dbw->select(
2928                         'revision',
2929                         $fields,
2930                         [ 'rev_page' => $id ],
2931                         __METHOD__,
2932                         'FOR UPDATE'
2933                 );
2934                 // Build their equivalent archive rows
2935                 $rowsInsert = [];
2936                 foreach ( $res as $row ) {
2937                         $rowInsert = [
2938                                 'ar_namespace'  => $namespace,
2939                                 'ar_title'      => $dbKey,
2940                                 'ar_comment'    => $row->rev_comment,
2941                                 'ar_user'       => $row->rev_user,
2942                                 'ar_user_text'  => $row->rev_user_text,
2943                                 'ar_timestamp'  => $row->rev_timestamp,
2944                                 'ar_minor_edit' => $row->rev_minor_edit,
2945                                 'ar_rev_id'     => $row->rev_id,
2946                                 'ar_parent_id'  => $row->rev_parent_id,
2947                                 'ar_text_id'    => $row->rev_text_id,
2948                                 'ar_text'       => '',
2949                                 'ar_flags'      => '',
2950                                 'ar_len'        => $row->rev_len,
2951                                 'ar_page_id'    => $id,
2952                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2953                                 'ar_sha1'       => $row->rev_sha1,
2954                         ];
2955                         if ( $wgContentHandlerUseDB ) {
2956                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2957                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2958                         }
2959                         $rowsInsert[] = $rowInsert;
2960                 }
2961                 // Copy them into the archive table
2962                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2963                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2964                 $archivedRevisionCount = $dbw->affectedRows();
2965
2966                 // Clone the title and wikiPage, so we have the information we need when
2967                 // we log and run the ArticleDeleteComplete hook.
2968                 $logTitle = clone $this->mTitle;
2969                 $wikiPageBeforeDelete = clone $this;
2970
2971                 // Now that it's safely backed up, delete it
2972                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2973                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2974
2975                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2976                 $logtype = $suppress ? 'suppress' : 'delete';
2977
2978                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2979                 $logEntry->setPerformer( $user );
2980                 $logEntry->setTarget( $logTitle );
2981                 $logEntry->setComment( $reason );
2982                 $logEntry->setTags( $tags );
2983                 $logid = $logEntry->insert();
2984
2985                 $dbw->onTransactionPreCommitOrIdle(
2986                         function () use ( $dbw, $logEntry, $logid ) {
2987                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2988                                 $logEntry->publish( $logid );
2989                         },
2990                         __METHOD__
2991                 );
2992
2993                 $dbw->endAtomic( __METHOD__ );
2994
2995                 $this->doDeleteUpdates( $id, $content, $revision );
2996
2997                 Hooks::run( 'ArticleDeleteComplete', [
2998                         &$wikiPageBeforeDelete,
2999                         &$user,
3000                         $reason,
3001                         $id,
3002                         $content,
3003                         $logEntry,
3004                         $archivedRevisionCount
3005                 ] );
3006                 $status->value = $logid;
3007
3008                 // Show log excerpt on 404 pages rather than just a link
3009                 $cache = ObjectCache::getMainStashInstance();
3010                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
3011                 $cache->set( $key, 1, $cache::TTL_DAY );
3012
3013                 return $status;
3014         }
3015
3016         /**
3017          * Lock the page row for this title+id and return page_latest (or 0)
3018          *
3019          * @return integer Returns 0 if no row was found with this title+id
3020          * @since 1.27
3021          */
3022         public function lockAndGetLatest() {
3023                 return (int)wfGetDB( DB_MASTER )->selectField(
3024                         'page',
3025                         'page_latest',
3026                         [
3027                                 'page_id' => $this->getId(),
3028                                 // Typically page_id is enough, but some code might try to do
3029                                 // updates assuming the title is the same, so verify that
3030                                 'page_namespace' => $this->getTitle()->getNamespace(),
3031                                 'page_title' => $this->getTitle()->getDBkey()
3032                         ],
3033                         __METHOD__,
3034                         [ 'FOR UPDATE' ]
3035                 );
3036         }
3037
3038         /**
3039          * Do some database updates after deletion
3040          *
3041          * @param int $id The page_id value of the page being deleted
3042          * @param Content|null $content Optional page content to be used when determining
3043          *   the required updates. This may be needed because $this->getContent()
3044          *   may already return null when the page proper was deleted.
3045          * @param Revision|null $revision The latest page revision
3046          */
3047         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
3048                 try {
3049                         $countable = $this->isCountable();
3050                 } catch ( Exception $ex ) {
3051                         // fallback for deleting broken pages for which we cannot load the content for
3052                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3053                         $countable = false;
3054                 }
3055
3056                 // Update site status
3057                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3058
3059                 // Delete pagelinks, update secondary indexes, etc
3060                 $updates = $this->getDeletionUpdates( $content );
3061                 foreach ( $updates as $update ) {
3062                         DeferredUpdates::addUpdate( $update );
3063                 }
3064
3065                 // Reparse any pages transcluding this page
3066                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3067
3068                 // Reparse any pages including this image
3069                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3070                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3071                 }
3072
3073                 // Clear caches
3074                 WikiPage::onArticleDelete( $this->mTitle );
3075                 ResourceLoaderWikiModule::invalidateModuleCache(
3076                         $this->mTitle, $revision, null, wfWikiID()
3077                 );
3078
3079                 // Reset this object and the Title object
3080                 $this->loadFromRow( false, self::READ_LATEST );
3081
3082                 // Search engine
3083                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3084         }
3085
3086         /**
3087          * Roll back the most recent consecutive set of edits to a page
3088          * from the same user; fails if there are no eligible edits to
3089          * roll back to, e.g. user is the sole contributor. This function
3090          * performs permissions checks on $user, then calls commitRollback()
3091          * to do the dirty work
3092          *
3093          * @todo Separate the business/permission stuff out from backend code
3094          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3095          *
3096          * @param string $fromP Name of the user whose edits to rollback.
3097          * @param string $summary Custom summary. Set to default summary if empty.
3098          * @param string $token Rollback token.
3099          * @param bool $bot If true, mark all reverted edits as bot.
3100          *
3101          * @param array $resultDetails Array contains result-specific array of additional values
3102          *    'alreadyrolled' : 'current' (rev)
3103          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3104          *
3105          * @param User $user The user performing the rollback
3106          * @param array|null $tags Change tags to apply to the rollback
3107          * Callers are responsible for permission checks
3108          * (with ChangeTags::canAddTagsAccompanyingChange)
3109          *
3110          * @return array Array of errors, each error formatted as
3111          *   array(messagekey, param1, param2, ...).
3112          * On success, the array is empty.  This array can also be passed to
3113          * OutputPage::showPermissionsErrorPage().
3114          */
3115         public function doRollback(
3116                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3117         ) {
3118                 $resultDetails = null;
3119
3120                 // Check permissions
3121                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3122                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3123                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3124
3125                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3126                         $errors[] = [ 'sessionfailure' ];
3127                 }
3128
3129                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3130                         $errors[] = [ 'actionthrottledtext' ];
3131                 }
3132
3133                 // If there were errors, bail out now
3134                 if ( !empty( $errors ) ) {
3135                         return $errors;
3136                 }
3137
3138                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3139         }
3140
3141         /**
3142          * Backend implementation of doRollback(), please refer there for parameter
3143          * and return value documentation
3144          *
3145          * NOTE: This function does NOT check ANY permissions, it just commits the
3146          * rollback to the DB. Therefore, you should only call this function direct-
3147          * ly if you want to use custom permissions checks. If you don't, use
3148          * doRollback() instead.
3149          * @param string $fromP Name of the user whose edits to rollback.
3150          * @param string $summary Custom summary. Set to default summary if empty.
3151          * @param bool $bot If true, mark all reverted edits as bot.
3152          *
3153          * @param array $resultDetails Contains result-specific array of additional values
3154          * @param User $guser The user performing the rollback
3155          * @param array|null $tags Change tags to apply to the rollback
3156          * Callers are responsible for permission checks
3157          * (with ChangeTags::canAddTagsAccompanyingChange)
3158          *
3159          * @return array
3160          */
3161         public function commitRollback( $fromP, $summary, $bot,
3162                 &$resultDetails, User $guser, $tags = null
3163         ) {
3164                 global $wgUseRCPatrol, $wgContLang;
3165
3166                 $dbw = wfGetDB( DB_MASTER );
3167
3168                 if ( wfReadOnly() ) {
3169                         return [ [ 'readonlytext' ] ];
3170                 }
3171
3172                 // Get the last editor
3173                 $current = $this->getRevision();
3174                 if ( is_null( $current ) ) {
3175                         // Something wrong... no page?
3176                         return [ [ 'notanarticle' ] ];
3177                 }
3178
3179                 $from = str_replace( '_', ' ', $fromP );
3180                 // User name given should match up with the top revision.
3181                 // If the user was deleted then $from should be empty.
3182                 if ( $from != $current->getUserText() ) {
3183                         $resultDetails = [ 'current' => $current ];
3184                         return [ [ 'alreadyrolled',
3185                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3186                                 htmlspecialchars( $fromP ),
3187                                 htmlspecialchars( $current->getUserText() )
3188                         ] ];
3189                 }
3190
3191                 // Get the last edit not by this person...
3192                 // Note: these may not be public values
3193                 $user = intval( $current->getUser( Revision::RAW ) );
3194                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3195                 $s = $dbw->selectRow( 'revision',
3196                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3197                         [ 'rev_page' => $current->getPage(),
3198                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3199                         ], __METHOD__,
3200                         [ 'USE INDEX' => 'page_timestamp',
3201                                 'ORDER BY' => 'rev_timestamp DESC' ]
3202                         );
3203                 if ( $s === false ) {
3204                         // No one else ever edited this page
3205                         return [ [ 'cantrollback' ] ];
3206                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3207                         || $s->rev_deleted & Revision::DELETED_USER
3208                 ) {
3209                         // Only admins can see this text
3210                         return [ [ 'notvisiblerev' ] ];
3211                 }
3212
3213                 // Generate the edit summary if necessary
3214                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3215                 if ( empty( $summary ) ) {
3216                         if ( $from == '' ) { // no public user name
3217                                 $summary = wfMessage( 'revertpage-nouser' );
3218                         } else {
3219                                 $summary = wfMessage( 'revertpage' );
3220                         }
3221                 }
3222
3223                 // Allow the custom summary to use the same args as the default message
3224                 $args = [
3225                         $target->getUserText(), $from, $s->rev_id,
3226                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3227                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3228                 ];
3229                 if ( $summary instanceof Message ) {
3230                         $summary = $summary->params( $args )->inContentLanguage()->text();
3231                 } else {
3232                         $summary = wfMsgReplaceArgs( $summary, $args );
3233                 }
3234
3235                 // Trim spaces on user supplied text
3236                 $summary = trim( $summary );
3237
3238                 // Truncate for whole multibyte characters.
3239                 $summary = $wgContLang->truncate( $summary, 255 );
3240
3241                 // Save
3242                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3243
3244                 if ( $guser->isAllowed( 'minoredit' ) ) {
3245                         $flags |= EDIT_MINOR;
3246                 }
3247
3248                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3249                         $flags |= EDIT_FORCE_BOT;
3250                 }
3251
3252                 $targetContent = $target->getContent();
3253                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3254
3255                 // Actually store the edit
3256                 $status = $this->doEditContent(
3257                         $targetContent,
3258                         $summary,
3259                         $flags,
3260                         $target->getId(),
3261                         $guser,
3262                         null,
3263                         $tags
3264                 );
3265
3266                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3267                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3268                 $set = [];
3269                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3270                         // Mark all reverted edits as bot
3271                         $set['rc_bot'] = 1;
3272                 }
3273
3274                 if ( $wgUseRCPatrol ) {
3275                         // Mark all reverted edits as patrolled
3276                         $set['rc_patrolled'] = 1;
3277                 }
3278
3279                 if ( count( $set ) ) {
3280                         $dbw->update( 'recentchanges', $set,
3281                                 [ /* WHERE */
3282                                         'rc_cur_id' => $current->getPage(),
3283                                         'rc_user_text' => $current->getUserText(),
3284                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3285                                 ],
3286                                 __METHOD__
3287                         );
3288                 }
3289
3290                 if ( !$status->isOK() ) {
3291                         return $status->getErrorsArray();
3292                 }
3293
3294                 // raise error, when the edit is an edit without a new version
3295                 $statusRev = isset( $status->value['revision'] )
3296                         ? $status->value['revision']
3297                         : null;
3298                 if ( !( $statusRev instanceof Revision ) ) {
3299                         $resultDetails = [ 'current' => $current ];
3300                         return [ [ 'alreadyrolled',
3301                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3302                                         htmlspecialchars( $fromP ),
3303                                         htmlspecialchars( $current->getUserText() )
3304                         ] ];
3305                 }
3306
3307                 if ( $changingContentModel ) {
3308                         // If the content model changed during the rollback,
3309                         // make sure it gets logged to Special:Log/contentmodel
3310                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3311                         $log->setPerformer( $guser );
3312                         $log->setTarget( $this->mTitle );
3313                         $log->setComment( $summary );
3314                         $log->setParameters( [
3315                                 '4::oldmodel' => $current->getContentModel(),
3316                                 '5::newmodel' => $targetContent->getModel(),
3317                         ] );
3318
3319                         $logId = $log->insert( $dbw );
3320                         $log->publish( $logId );
3321                 }
3322
3323                 $revId = $statusRev->getId();
3324
3325                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3326
3327                 $resultDetails = [
3328                         'summary' => $summary,
3329                         'current' => $current,
3330                         'target' => $target,
3331                         'newid' => $revId
3332                 ];
3333
3334                 return [];
3335         }
3336
3337         /**
3338          * The onArticle*() functions are supposed to be a kind of hooks
3339          * which should be called whenever any of the specified actions
3340          * are done.
3341          *
3342          * This is a good place to put code to clear caches, for instance.
3343          *
3344          * This is called on page move and undelete, as well as edit
3345          *
3346          * @param Title $title
3347          */
3348         public static function onArticleCreate( Title $title ) {
3349                 // Update existence markers on article/talk tabs...
3350                 $other = $title->getOtherPage();
3351
3352                 $other->purgeSquid();
3353
3354                 $title->touchLinks();
3355                 $title->purgeSquid();
3356                 $title->deleteTitleProtection();
3357
3358                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3359
3360                 if ( $title->getNamespace() == NS_CATEGORY ) {
3361                         // Load the Category object, which will schedule a job to create
3362                         // the category table row if necessary. Checking a replica DB is ok
3363                         // here, in the worst case it'll run an unnecessary recount job on
3364                         // a category that probably doesn't have many members.
3365                         Category::newFromTitle( $title )->getID();
3366                 }
3367         }
3368
3369         /**
3370          * Clears caches when article is deleted
3371          *
3372          * @param Title $title
3373          */
3374         public static function onArticleDelete( Title $title ) {
3375                 // Update existence markers on article/talk tabs...
3376                 $other = $title->getOtherPage();
3377
3378                 $other->purgeSquid();
3379
3380                 $title->touchLinks();
3381                 $title->purgeSquid();
3382
3383                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3384
3385                 // File cache
3386                 HTMLFileCache::clearFileCache( $title );
3387                 InfoAction::invalidateCache( $title );
3388
3389                 // Messages
3390                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3391                         MessageCache::singleton()->updateMessageOverride( $title, null );
3392                 }
3393
3394                 // Images
3395                 if ( $title->getNamespace() == NS_FILE ) {
3396                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3397                 }
3398
3399                 // User talk pages
3400                 if ( $title->getNamespace() == NS_USER_TALK ) {
3401                         $user = User::newFromName( $title->getText(), false );
3402                         if ( $user ) {
3403                                 $user->setNewtalk( false );
3404                         }
3405                 }
3406
3407                 // Image redirects
3408                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3409         }
3410
3411         /**
3412          * Purge caches on page update etc
3413          *
3414          * @param Title $title
3415          * @param Revision|null $revision Revision that was just saved, may be null
3416          */
3417         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3418                 // Invalidate caches of articles which include this page
3419                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3420
3421                 // Invalidate the caches of all pages which redirect here
3422                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3423
3424                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3425
3426                 // Purge CDN for this page only
3427                 $title->purgeSquid();
3428                 // Clear file cache for this page only
3429                 HTMLFileCache::clearFileCache( $title );
3430
3431                 $revid = $revision ? $revision->getId() : null;
3432                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3433                         InfoAction::invalidateCache( $title, $revid );
3434                 } );
3435         }
3436
3437         /**#@-*/
3438
3439         /**
3440          * Returns a list of categories this page is a member of.
3441          * Results will include hidden categories
3442          *
3443          * @return TitleArray
3444          */
3445         public function getCategories() {
3446                 $id = $this->getId();
3447                 if ( $id == 0 ) {
3448                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3449                 }
3450
3451                 $dbr = wfGetDB( DB_REPLICA );
3452                 $res = $dbr->select( 'categorylinks',
3453                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3454                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3455                         // as not being aliases, and NS_CATEGORY is numeric
3456                         [ 'cl_from' => $id ],
3457                         __METHOD__ );
3458
3459                 return TitleArray::newFromResult( $res );
3460         }
3461
3462         /**
3463          * Returns a list of hidden categories this page is a member of.
3464          * Uses the page_props and categorylinks tables.
3465          *
3466          * @return array Array of Title objects
3467          */
3468         public function getHiddenCategories() {
3469                 $result = [];
3470                 $id = $this->getId();
3471
3472                 if ( $id == 0 ) {
3473                         return [];
3474                 }
3475
3476                 $dbr = wfGetDB( DB_REPLICA );
3477                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3478                         [ 'cl_to' ],
3479                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3480                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3481                         __METHOD__ );
3482
3483                 if ( $res !== false ) {
3484                         foreach ( $res as $row ) {
3485                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3486                         }
3487                 }
3488
3489                 return $result;
3490         }
3491
3492         /**
3493          * Return an applicable autosummary if one exists for the given edit.
3494          * @param string|null $oldtext The previous text of the page.
3495          * @param string|null $newtext The submitted text of the page.
3496          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3497          * @return string An appropriate autosummary, or an empty string.
3498          *
3499          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3500          */
3501         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3502                 // NOTE: stub for backwards-compatibility. assumes the given text is
3503                 // wikitext. will break horribly if it isn't.
3504
3505                 wfDeprecated( __METHOD__, '1.21' );
3506
3507                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3508                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3509                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3510
3511                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3512         }
3513
3514         /**
3515          * Auto-generates a deletion reason
3516          *
3517          * @param bool &$hasHistory Whether the page has a history
3518          * @return string|bool String containing deletion reason or empty string, or boolean false
3519          *    if no revision occurred
3520          */
3521         public function getAutoDeleteReason( &$hasHistory ) {
3522                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3523         }
3524
3525         /**
3526          * Update all the appropriate counts in the category table, given that
3527          * we've added the categories $added and deleted the categories $deleted.
3528          *
3529          * This should only be called from deferred updates or jobs to avoid contention.
3530          *
3531          * @param array $added The names of categories that were added
3532          * @param array $deleted The names of categories that were deleted
3533          * @param integer $id Page ID (this should be the original deleted page ID)
3534          */
3535         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3536                 $id = $id ?: $this->getId();
3537                 $ns = $this->getTitle()->getNamespace();
3538
3539                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3540                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3541                 if ( $ns == NS_CATEGORY ) {
3542                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3543                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3544                 } elseif ( $ns == NS_FILE ) {
3545                         $addFields[] = 'cat_files = cat_files + 1';
3546                         $removeFields[] = 'cat_files = cat_files - 1';
3547                 }
3548
3549                 $dbw = wfGetDB( DB_MASTER );
3550
3551                 if ( count( $added ) ) {
3552                         $existingAdded = $dbw->selectFieldValues(
3553                                 'category',
3554                                 'cat_title',
3555                                 [ 'cat_title' => $added ],
3556                                 __METHOD__
3557                         );
3558
3559                         // For category rows that already exist, do a plain
3560                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3561                         // to avoid creating gaps in the cat_id sequence.
3562                         if ( count( $existingAdded ) ) {
3563                                 $dbw->update(
3564                                         'category',
3565                                         $addFields,
3566                                         [ 'cat_title' => $existingAdded ],
3567                                         __METHOD__
3568                                 );
3569                         }
3570
3571                         $missingAdded = array_diff( $added, $existingAdded );
3572                         if ( count( $missingAdded ) ) {
3573                                 $insertRows = [];
3574                                 foreach ( $missingAdded as $cat ) {
3575                                         $insertRows[] = [
3576                                                 'cat_title'   => $cat,
3577                                                 'cat_pages'   => 1,
3578                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3579                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3580                                         ];
3581                                 }
3582                                 $dbw->upsert(
3583                                         'category',
3584                                         $insertRows,
3585                                         [ 'cat_title' ],
3586                                         $addFields,
3587                                         __METHOD__
3588                                 );
3589                         }
3590                 }
3591
3592                 if ( count( $deleted ) ) {
3593                         $dbw->update(
3594                                 'category',
3595                                 $removeFields,
3596                                 [ 'cat_title' => $deleted ],
3597                                 __METHOD__
3598                         );
3599                 }
3600
3601                 foreach ( $added as $catName ) {
3602                         $cat = Category::newFromName( $catName );
3603                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3604                 }
3605
3606                 foreach ( $deleted as $catName ) {
3607                         $cat = Category::newFromName( $catName );
3608                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3609                 }
3610
3611                 // Refresh counts on categories that should be empty now, to
3612                 // trigger possible deletion. Check master for the most
3613                 // up-to-date cat_pages.
3614                 if ( count( $deleted ) ) {
3615                         $rows = $dbw->select(
3616                                 'category',
3617                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3618                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3619                                 __METHOD__
3620                         );
3621                         foreach ( $rows as $row ) {
3622                                 $cat = Category::newFromRow( $row );
3623                                 $cat->refreshCounts();
3624                         }
3625                 }
3626         }
3627
3628         /**
3629          * Opportunistically enqueue link update jobs given fresh parser output if useful
3630          *
3631          * @param ParserOutput $parserOutput Current version page output
3632          * @since 1.25
3633          */
3634         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3635                 if ( wfReadOnly() ) {
3636                         return;
3637                 }
3638
3639                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3640                         [ $this, $this->mTitle, $parserOutput ]
3641                 ) ) {
3642                         return;
3643                 }
3644
3645                 $config = RequestContext::getMain()->getConfig();
3646
3647                 $params = [
3648                         'isOpportunistic' => true,
3649                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3650                 ];
3651
3652                 if ( $this->mTitle->areRestrictionsCascading() ) {
3653                         // If the page is cascade protecting, the links should really be up-to-date
3654                         JobQueueGroup::singleton()->lazyPush(
3655                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3656                         );
3657                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3658                         // Assume the output contains "dynamic" time/random based magic words.
3659                         // Only update pages that expired due to dynamic content and NOT due to edits
3660                         // to referenced templates/files. When the cache expires due to dynamic content,
3661                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3662                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3663                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3664                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3665                                 // If a page is uncacheable, do not keep spamming a job for it.
3666                                 // Although it would be de-duplicated, it would still waste I/O.
3667                                 $cache = ObjectCache::getLocalClusterInstance();
3668                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3669                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3670                                 if ( $cache->add( $key, time(), $ttl ) ) {
3671                                         JobQueueGroup::singleton()->lazyPush(
3672                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3673                                         );
3674                                 }
3675                         }
3676                 }
3677         }
3678
3679         /**
3680          * Returns a list of updates to be performed when this page is deleted. The
3681          * updates should remove any information about this page from secondary data
3682          * stores such as links tables.
3683          *
3684          * @param Content|null $content Optional Content object for determining the
3685          *   necessary updates.
3686          * @return DeferrableUpdate[]
3687          */
3688         public function getDeletionUpdates( Content $content = null ) {
3689                 if ( !$content ) {
3690                         // load content object, which may be used to determine the necessary updates.
3691                         // XXX: the content may not be needed to determine the updates.
3692                         try {
3693                                 $content = $this->getContent( Revision::RAW );
3694                         } catch ( Exception $ex ) {
3695                                 // If we can't load the content, something is wrong. Perhaps that's why
3696                                 // the user is trying to delete the page, so let's not fail in that case.
3697                                 // Note that doDeleteArticleReal() will already have logged an issue with
3698                                 // loading the content.
3699                         }
3700                 }
3701
3702                 if ( !$content ) {
3703                         $updates = [];
3704                 } else {
3705                         $updates = $content->getDeletionUpdates( $this );
3706                 }
3707
3708                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3709                 return $updates;
3710         }
3711
3712         /**
3713          * Whether this content displayed on this page
3714          * comes from the local database
3715          *
3716          * @since 1.28
3717          * @return bool
3718          */
3719         public function isLocal() {
3720                 return true;
3721         }
3722 }