includes/page/WikiPage.php

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