includes/page/WikiPage.php

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