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