includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * Class representing a MediaWiki article and history.
  27  *
  28  * Some fields are public only for backwards-compatibility. Use accessors.
  29  * In the past, this class was part of Article.php and everything was public.
  30  */
  31 class WikiPage implements Page, IDBAccessObject {
  32         // Constants for $mDataLoadedFrom and related
  33
  34         /**
  35          * @var Title
  36          */
  37         public $mTitle = null;
  38
  39         /**@{{
  40          * @protected
  41          */
  42         public $mDataLoaded = false;         // !< Boolean
  43         public $mIsRedirect = false;         // !< Boolean
  44         public $mLatest = false;             // !< Integer (false means "not loaded")
  45         /**@}}*/
  46
  47         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  48         public $mPreparedEdit = false;
  49
  50         /**
  51          * @var int
  52          */
  53         protected $mId = null;
  54
  55         /**
  56          * @var int One of the READ_* constants
  57          */
  58         protected $mDataLoadedFrom = self::READ_NONE;
  59
  60         /**
  61          * @var Title
  62          */
  63         protected $mRedirectTarget = null;
  64
  65         /**
  66          * @var Revision
  67          */
  68         protected $mLastRevision = null;
  69
  70         /**
  71          * @var string Timestamp of the current revision or empty string if not loaded
  72          */
  73         protected $mTimestamp = '';
  74
  75         /**
  76          * @var string
  77          */
  78         protected $mTouched = '19700101000000';
  79
  80         /**
  81          * @var string
  82          */
  83         protected $mLinksUpdated = '19700101000000';
  84
  85         /**
  86          * Constructor and clear the article
  87          * @param Title $title Reference to a Title object.
  88          */
  89         public function __construct( Title $title ) {
  90                 $this->mTitle = $title;
  91         }
  92
  93         /**
  94          * Create a WikiPage object of the appropriate class for the given title.
  95          *
  96          * @param Title $title
  97          *
  98          * @throws MWException
  99          * @return WikiPage|WikiCategoryPage|WikiFilePage
 100          */
 101         public static function factory( Title $title ) {
 102                 $ns = $title->getNamespace();
 103
 104                 if ( $ns == NS_MEDIA ) {
 105                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 106                 } elseif ( $ns < 0 ) {
 107                         throw new MWException( "Invalid or virtual namespace $ns given." );
 108                 }
 109
 110                 switch ( $ns ) {
 111                         case NS_FILE:
 112                                 $page = new WikiFilePage( $title );
 113                                 break;
 114                         case NS_CATEGORY:
 115                                 $page = new WikiCategoryPage( $title );
 116                                 break;
 117                         default:
 118                                 $page = new WikiPage( $title );
 119                 }
 120
 121                 return $page;
 122         }
 123
 124         /**
 125          * Constructor from a page id
 126          *
 127          * @param int $id Article ID to load
 128          * @param string|int $from One of the following values:
 129          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 130          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 131          *
 132          * @return WikiPage|null
 133          */
 134         public static function newFromID( $id, $from = 'fromdb' ) {
 135                 // page id's are never 0 or negative, see bug 61166
 136                 if ( $id < 1 ) {
 137                         return null;
 138                 }
 139
 140                 $from = self::convertSelectType( $from );
 141                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 142                 $row = $db->selectRow(
 143                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 144                 if ( !$row ) {
 145                         return null;
 146                 }
 147                 return self::newFromRow( $row, $from );
 148         }
 149
 150         /**
 151          * Constructor from a database row
 152          *
 153          * @since 1.20
 154          * @param object $row Database row containing at least fields returned by selectFields().
 155          * @param string|int $from Source of $data:
 156          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 157          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 158          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 159          * @return WikiPage
 160          */
 161         public static function newFromRow( $row, $from = 'fromdb' ) {
 162                 $page = self::factory( Title::newFromRow( $row ) );
 163                 $page->loadFromRow( $row, $from );
 164                 return $page;
 165         }
 166
 167         /**
 168          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 169          *
 170          * @param object|string|int $type
 171          * @return mixed
 172          */
 173         private static function convertSelectType( $type ) {
 174                 switch ( $type ) {
 175                 case 'fromdb':
 176                         return self::READ_NORMAL;
 177                 case 'fromdbmaster':
 178                         return self::READ_LATEST;
 179                 case 'forupdate':
 180                         return self::READ_LOCKING;
 181                 default:
 182                         // It may already be an integer or whatever else
 183                         return $type;
 184                 }
 185         }
 186
 187         /**
 188          * @todo Move this UI stuff somewhere else
 189          *
 190          * @see ContentHandler::getActionOverrides
 191          */
 192         public function getActionOverrides() {
 193                 return $this->getContentHandler()->getActionOverrides();
 194         }
 195
 196         /**
 197          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 198          *
 199          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 200          *
 201          * @return ContentHandler
 202          *
 203          * @since 1.21
 204          */
 205         public function getContentHandler() {
 206                 return ContentHandler::getForModelID( $this->getContentModel() );
 207         }
 208
 209         /**
 210          * Get the title object of the article
 211          * @return Title Title object of this page
 212          */
 213         public function getTitle() {
 214                 return $this->mTitle;
 215         }
 216
 217         /**
 218          * Clear the object
 219          * @return void
 220          */
 221         public function clear() {
 222                 $this->mDataLoaded = false;
 223                 $this->mDataLoadedFrom = self::READ_NONE;
 224
 225                 $this->clearCacheFields();
 226         }
 227
 228         /**
 229          * Clear the object cache fields
 230          * @return void
 231          */
 232         protected function clearCacheFields() {
 233                 $this->mId = null;
 234                 $this->mRedirectTarget = null; // Title object if set
 235                 $this->mLastRevision = null; // Latest revision
 236                 $this->mTouched = '19700101000000';
 237                 $this->mLinksUpdated = '19700101000000';
 238                 $this->mTimestamp = '';
 239                 $this->mIsRedirect = false;
 240                 $this->mLatest = false;
 241                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 242                 // the requested rev ID and content against the cached one for equality. For most
 243                 // content types, the output should not change during the lifetime of this cache.
 244                 // Clearing it can cause extra parses on edit for no reason.
 245         }
 246
 247         /**
 248          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 249          * @return void
 250          * @since 1.23
 251          */
 252         public function clearPreparedEdit() {
 253                 $this->mPreparedEdit = false;
 254         }
 255
 256         /**
 257          * Return the list of revision fields that should be selected to create
 258          * a new page.
 259          *
 260          * @return array
 261          */
 262         public static function selectFields() {
 263                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 264
 265                 $fields = [
 266                         'page_id',
 267                         'page_namespace',
 268                         'page_title',
 269                         'page_restrictions',
 270                         'page_is_redirect',
 271                         'page_is_new',
 272                         'page_random',
 273                         'page_touched',
 274                         'page_links_updated',
 275                         'page_latest',
 276                         'page_len',
 277                 ];
 278
 279                 if ( $wgContentHandlerUseDB ) {
 280                         $fields[] = 'page_content_model';
 281                 }
 282
 283                 if ( $wgPageLanguageUseDB ) {
 284                         $fields[] = 'page_lang';
 285                 }
 286
 287                 return $fields;
 288         }
 289
 290         /**
 291          * Fetch a page record with the given conditions
 292          * @param IDatabase $dbr
 293          * @param array $conditions
 294          * @param array $options
 295          * @return object|bool Database result resource, or false on failure
 296          */
 297         protected function pageData( $dbr, $conditions, $options = [] ) {
 298                 $fields = self::selectFields();
 299
 300                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 301
 302                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 303
 304                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 305
 306                 return $row;
 307         }
 308
 309         /**
 310          * Fetch a page record matching the Title object's namespace and title
 311          * using a sanitized title string
 312          *
 313          * @param IDatabase $dbr
 314          * @param Title $title
 315          * @param array $options
 316          * @return object|bool Database result resource, or false on failure
 317          */
 318         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 319                 return $this->pageData( $dbr, [
 320                         'page_namespace' => $title->getNamespace(),
 321                         'page_title' => $title->getDBkey() ], $options );
 322         }
 323
 324         /**
 325          * Fetch a page record matching the requested ID
 326          *
 327          * @param IDatabase $dbr
 328          * @param int $id
 329          * @param array $options
 330          * @return object|bool Database result resource, or false on failure
 331          */
 332         public function pageDataFromId( $dbr, $id, $options = [] ) {
 333                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 334         }
 335
 336         /**
 337          * Load the object from a given source by title
 338          *
 339          * @param object|string|int $from One of the following:
 340          *   - A DB query result object.
 341          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 342          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 343          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 344          *     using SELECT FOR UPDATE.
 345          *
 346          * @return void
 347          */
 348         public function loadPageData( $from = 'fromdb' ) {
 349                 $from = self::convertSelectType( $from );
 350                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 351                         // We already have the data from the correct location, no need to load it twice.
 352                         return;
 353                 }
 354
 355                 if ( is_int( $from ) ) {
 356                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 357                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 358
 359                         if ( !$data
 360                                 && $index == DB_SLAVE
 361                                 && wfGetLB()->getServerCount() > 1
 362                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 363                         ) {
 364                                 $from = self::READ_LATEST;
 365                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 366                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 367                         }
 368                 } else {
 369                         // No idea from where the caller got this data, assume slave database.
 370                         $data = $from;
 371                         $from = self::READ_NORMAL;
 372                 }
 373
 374                 $this->loadFromRow( $data, $from );
 375         }
 376
 377         /**
 378          * Load the object from a database row
 379          *
 380          * @since 1.20
 381          * @param object|bool $data DB row containing fields returned by selectFields() or false
 382          * @param string|int $from One of the following:
 383          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 384          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 385          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 386          *          the master DB using SELECT FOR UPDATE
 387          */
 388         public function loadFromRow( $data, $from ) {
 389                 $lc = LinkCache::singleton();
 390                 $lc->clearLink( $this->mTitle );
 391
 392                 if ( $data ) {
 393                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 394
 395                         $this->mTitle->loadFromRow( $data );
 396
 397                         // Old-fashioned restrictions
 398                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 399
 400                         $this->mId = intval( $data->page_id );
 401                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 402                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 403                         $this->mIsRedirect = intval( $data->page_is_redirect );
 404                         $this->mLatest = intval( $data->page_latest );
 405                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 406                         // Double-check the ID of any cached latest Revision object for consistency.
 407                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 408                                 $this->mLastRevision = null;
 409                                 $this->mTimestamp = '';
 410                         }
 411                 } else {
 412                         $lc->addBadLinkObj( $this->mTitle );
 413
 414                         $this->mTitle->loadFromRow( false );
 415
 416                         $this->clearCacheFields();
 417
 418                         $this->mId = 0;
 419                 }
 420
 421                 $this->mDataLoaded = true;
 422                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 423         }
 424
 425         /**
 426          * @return int Page ID
 427          */
 428         public function getId() {
 429                 if ( !$this->mDataLoaded ) {
 430                         $this->loadPageData();
 431                 }
 432                 return $this->mId;
 433         }
 434
 435         /**
 436          * @return bool Whether or not the page exists in the database
 437          */
 438         public function exists() {
 439                 if ( !$this->mDataLoaded ) {
 440                         $this->loadPageData();
 441                 }
 442                 return $this->mId > 0;
 443         }
 444
 445         /**
 446          * Check if this page is something we're going to be showing
 447          * some sort of sensible content for. If we return false, page
 448          * views (plain action=view) will return an HTTP 404 response,
 449          * so spiders and robots can know they're following a bad link.
 450          *
 451          * @return bool
 452          */
 453         public function hasViewableContent() {
 454                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 455         }
 456
 457         /**
 458          * Tests if the article content represents a redirect
 459          *
 460          * @return bool
 461          */
 462         public function isRedirect() {
 463                 if ( !$this->mDataLoaded ) {
 464                         $this->loadPageData();
 465                 }
 466
 467                 return (bool)$this->mIsRedirect;
 468         }
 469
 470         /**
 471          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 472          *
 473          * Will use the revisions actual content model if the page exists,
 474          * and the page's default if the page doesn't exist yet.
 475          *
 476          * @return string
 477          *
 478          * @since 1.21
 479          */
 480         public function getContentModel() {
 481                 if ( $this->exists() ) {
 482                         // look at the revision's actual content model
 483                         $rev = $this->getRevision();
 484
 485                         if ( $rev !== null ) {
 486                                 return $rev->getContentModel();
 487                         } else {
 488                                 $title = $this->mTitle->getPrefixedDBkey();
 489                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 490                         }
 491                 }
 492
 493                 // use the default model for this page
 494                 return $this->mTitle->getContentModel();
 495         }
 496
 497         /**
 498          * Loads page_touched and returns a value indicating if it should be used
 499          * @return bool True if not a redirect
 500          */
 501         public function checkTouched() {
 502                 if ( !$this->mDataLoaded ) {
 503                         $this->loadPageData();
 504                 }
 505                 return !$this->mIsRedirect;
 506         }
 507
 508         /**
 509          * Get the page_touched field
 510          * @return string Containing GMT timestamp
 511          */
 512         public function getTouched() {
 513                 if ( !$this->mDataLoaded ) {
 514                         $this->loadPageData();
 515                 }
 516                 return $this->mTouched;
 517         }
 518
 519         /**
 520          * Get the page_links_updated field
 521          * @return string|null Containing GMT timestamp
 522          */
 523         public function getLinksTimestamp() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return $this->mLinksUpdated;
 528         }
 529
 530         /**
 531          * Get the page_latest field
 532          * @return int The rev_id of current revision
 533          */
 534         public function getLatest() {
 535                 if ( !$this->mDataLoaded ) {
 536                         $this->loadPageData();
 537                 }
 538                 return (int)$this->mLatest;
 539         }
 540
 541         /**
 542          * Get the Revision object of the oldest revision
 543          * @return Revision|null
 544          */
 545         public function getOldestRevision() {
 546
 547                 // Try using the slave database first, then try the master
 548                 $continue = 2;
 549                 $db = wfGetDB( DB_SLAVE );
 550                 $revSelectFields = Revision::selectFields();
 551
 552                 $row = null;
 553                 while ( $continue ) {
 554                         $row = $db->selectRow(
 555                                 [ 'page', 'revision' ],
 556                                 $revSelectFields,
 557                                 [
 558                                         'page_namespace' => $this->mTitle->getNamespace(),
 559                                         'page_title' => $this->mTitle->getDBkey(),
 560                                         'rev_page = page_id'
 561                                 ],
 562                                 __METHOD__,
 563                                 [
 564                                         'ORDER BY' => 'rev_timestamp ASC'
 565                                 ]
 566                         );
 567
 568                         if ( $row ) {
 569                                 $continue = 0;
 570                         } else {
 571                                 $db = wfGetDB( DB_MASTER );
 572                                 $continue--;
 573                         }
 574                 }
 575
 576                 return $row ? Revision::newFromRow( $row ) : null;
 577         }
 578
 579         /**
 580          * Loads everything except the text
 581          * This isn't necessary for all uses, so it's only done if needed.
 582          */
 583         protected function loadLastEdit() {
 584                 if ( $this->mLastRevision !== null ) {
 585                         return; // already loaded
 586                 }
 587
 588                 $latest = $this->getLatest();
 589                 if ( !$latest ) {
 590                         return; // page doesn't exist or is missing page_latest info
 591                 }
 592
 593                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 594                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 595                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 596                         // transactions, where S1 normally only sees changes committed before the first S1
 597                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 598                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 599                         // happened after the first S1 SELECT.
 600                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 601                         $flags = Revision::READ_LOCKING;
 602                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 603                         // Bug T93976: if page_latest was loaded from the master, fetch the
 604                         // revision from there as well, as it may not exist yet on a slave DB.
 605                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 606                         $flags = Revision::READ_LATEST;
 607                 } else {
 608                         $flags = 0;
 609                 }
 610                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 611                 if ( $revision ) { // sanity
 612                         $this->setLastEdit( $revision );
 613                 }
 614         }
 615
 616         /**
 617          * Set the latest revision
 618          * @param Revision $revision
 619          */
 620         protected function setLastEdit( Revision $revision ) {
 621                 $this->mLastRevision = $revision;
 622                 $this->mTimestamp = $revision->getTimestamp();
 623         }
 624
 625         /**
 626          * Get the latest revision
 627          * @return Revision|null
 628          */
 629         public function getRevision() {
 630                 $this->loadLastEdit();
 631                 if ( $this->mLastRevision ) {
 632                         return $this->mLastRevision;
 633                 }
 634                 return null;
 635         }
 636
 637         /**
 638          * Get the content of the current revision. No side-effects...
 639          *
 640          * @param int $audience One of:
 641          *   Revision::FOR_PUBLIC       to be displayed to all users
 642          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 643          *   Revision::RAW              get the text regardless of permissions
 644          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 645          *   to the $audience parameter
 646          * @return Content|null The content of the current revision
 647          *
 648          * @since 1.21
 649          */
 650         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 651                 $this->loadLastEdit();
 652                 if ( $this->mLastRevision ) {
 653                         return $this->mLastRevision->getContent( $audience, $user );
 654                 }
 655                 return null;
 656         }
 657
 658         /**
 659          * Get the text of the current revision. No side-effects...
 660          *
 661          * @param int $audience One of:
 662          *   Revision::FOR_PUBLIC       to be displayed to all users
 663          *   Revision::FOR_THIS_USER    to be displayed to the given user
 664          *   Revision::RAW              get the text regardless of permissions
 665          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 666          *   to the $audience parameter
 667          * @return string|bool The text of the current revision
 668          * @deprecated since 1.21, getContent() should be used instead.
 669          */
 670         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 671                 ContentHandler::deprecated( __METHOD__, '1.21' );
 672
 673                 $this->loadLastEdit();
 674                 if ( $this->mLastRevision ) {
 675                         return $this->mLastRevision->getText( $audience, $user );
 676                 }
 677                 return false;
 678         }
 679
 680         /**
 681          * @return string MW timestamp of last article revision
 682          */
 683         public function getTimestamp() {
 684                 // Check if the field has been filled by WikiPage::setTimestamp()
 685                 if ( !$this->mTimestamp ) {
 686                         $this->loadLastEdit();
 687                 }
 688
 689                 return wfTimestamp( TS_MW, $this->mTimestamp );
 690         }
 691
 692         /**
 693          * Set the page timestamp (use only to avoid DB queries)
 694          * @param string $ts MW timestamp of last article revision
 695          * @return void
 696          */
 697         public function setTimestamp( $ts ) {
 698                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 699         }
 700
 701         /**
 702          * @param int $audience One of:
 703          *   Revision::FOR_PUBLIC       to be displayed to all users
 704          *   Revision::FOR_THIS_USER    to be displayed to the given user
 705          *   Revision::RAW              get the text regardless of permissions
 706          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 707          *   to the $audience parameter
 708          * @return int User ID for the user that made the last article revision
 709          */
 710         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 711                 $this->loadLastEdit();
 712                 if ( $this->mLastRevision ) {
 713                         return $this->mLastRevision->getUser( $audience, $user );
 714                 } else {
 715                         return -1;
 716                 }
 717         }
 718
 719         /**
 720          * Get the User object of the user who created the page
 721          * @param int $audience One of:
 722          *   Revision::FOR_PUBLIC       to be displayed to all users
 723          *   Revision::FOR_THIS_USER    to be displayed to the given user
 724          *   Revision::RAW              get the text regardless of permissions
 725          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 726          *   to the $audience parameter
 727          * @return User|null
 728          */
 729         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 730                 $revision = $this->getOldestRevision();
 731                 if ( $revision ) {
 732                         $userName = $revision->getUserText( $audience, $user );
 733                         return User::newFromName( $userName, false );
 734                 } else {
 735                         return null;
 736                 }
 737         }
 738
 739         /**
 740          * @param int $audience One of:
 741          *   Revision::FOR_PUBLIC       to be displayed to all users
 742          *   Revision::FOR_THIS_USER    to be displayed to the given user
 743          *   Revision::RAW              get the text regardless of permissions
 744          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 745          *   to the $audience parameter
 746          * @return string Username of the user that made the last article revision
 747          */
 748         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 749                 $this->loadLastEdit();
 750                 if ( $this->mLastRevision ) {
 751                         return $this->mLastRevision->getUserText( $audience, $user );
 752                 } else {
 753                         return '';
 754                 }
 755         }
 756
 757         /**
 758          * @param int $audience One of:
 759          *   Revision::FOR_PUBLIC       to be displayed to all users
 760          *   Revision::FOR_THIS_USER    to be displayed to the given user
 761          *   Revision::RAW              get the text regardless of permissions
 762          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 763          *   to the $audience parameter
 764          * @return string Comment stored for the last article revision
 765          */
 766         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 767                 $this->loadLastEdit();
 768                 if ( $this->mLastRevision ) {
 769                         return $this->mLastRevision->getComment( $audience, $user );
 770                 } else {
 771                         return '';
 772                 }
 773         }
 774
 775         /**
 776          * Returns true if last revision was marked as "minor edit"
 777          *
 778          * @return bool Minor edit indicator for the last article revision.
 779          */
 780         public function getMinorEdit() {
 781                 $this->loadLastEdit();
 782                 if ( $this->mLastRevision ) {
 783                         return $this->mLastRevision->isMinor();
 784                 } else {
 785                         return false;
 786                 }
 787         }
 788
 789         /**
 790          * Determine whether a page would be suitable for being counted as an
 791          * article in the site_stats table based on the title & its content
 792          *
 793          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 794          *   if false, the current database state will be used
 795          * @return bool
 796          */
 797         public function isCountable( $editInfo = false ) {
 798                 global $wgArticleCountMethod;
 799
 800                 if ( !$this->mTitle->isContentPage() ) {
 801                         return false;
 802                 }
 803
 804                 if ( $editInfo ) {
 805                         $content = $editInfo->pstContent;
 806                 } else {
 807                         $content = $this->getContent();
 808                 }
 809
 810                 if ( !$content || $content->isRedirect() ) {
 811                         return false;
 812                 }
 813
 814                 $hasLinks = null;
 815
 816                 if ( $wgArticleCountMethod === 'link' ) {
 817                         // nasty special case to avoid re-parsing to detect links
 818
 819                         if ( $editInfo ) {
 820                                 // ParserOutput::getLinks() is a 2D array of page links, so
 821                                 // to be really correct we would need to recurse in the array
 822                                 // but the main array should only have items in it if there are
 823                                 // links.
 824                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 825                         } else {
 826                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 827                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 828                         }
 829                 }
 830
 831                 return $content->isCountable( $hasLinks );
 832         }
 833
 834         /**
 835          * If this page is a redirect, get its target
 836          *
 837          * The target will be fetched from the redirect table if possible.
 838          * If this page doesn't have an entry there, call insertRedirect()
 839          * @return Title|null Title object, or null if this page is not a redirect
 840          */
 841         public function getRedirectTarget() {
 842                 if ( !$this->mTitle->isRedirect() ) {
 843                         return null;
 844                 }
 845
 846                 if ( $this->mRedirectTarget !== null ) {
 847                         return $this->mRedirectTarget;
 848                 }
 849
 850                 // Query the redirect table
 851                 $dbr = wfGetDB( DB_SLAVE );
 852                 $row = $dbr->selectRow( 'redirect',
 853                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 854                         [ 'rd_from' => $this->getId() ],
 855                         __METHOD__
 856                 );
 857
 858                 // rd_fragment and rd_interwiki were added later, populate them if empty
 859                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 860                         $this->mRedirectTarget = Title::makeTitle(
 861                                 $row->rd_namespace, $row->rd_title,
 862                                 $row->rd_fragment, $row->rd_interwiki
 863                         );
 864                         return $this->mRedirectTarget;
 865                 }
 866
 867                 // This page doesn't have an entry in the redirect table
 868                 $this->mRedirectTarget = $this->insertRedirect();
 869                 return $this->mRedirectTarget;
 870         }
 871
 872         /**
 873          * Insert an entry for this page into the redirect table if the content is a redirect
 874          *
 875          * The database update will be deferred via DeferredUpdates
 876          *
 877          * Don't call this function directly unless you know what you're doing.
 878          * @return Title|null Title object or null if not a redirect
 879          */
 880         public function insertRedirect() {
 881                 $content = $this->getContent();
 882                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 883                 if ( !$retval ) {
 884                         return null;
 885                 }
 886
 887                 // Update the DB post-send if the page has not cached since now
 888                 $that = $this;
 889                 $latest = $this->getLatest();
 890                 DeferredUpdates::addCallableUpdate( function() use ( $that, $retval, $latest ) {
 891                         $that->insertRedirectEntry( $retval, $latest );
 892                 } );
 893
 894                 return $retval;
 895         }
 896
 897         /**
 898          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 899          * @param Title $rt Redirect target
 900          * @param int|null $oldLatest Prior page_latest for check and set
 901          */
 902         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 903                 $dbw = wfGetDB( DB_MASTER );
 904                 $dbw->startAtomic( __METHOD__ );
 905
 906                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 907                         $dbw->replace( 'redirect',
 908                                 [ 'rd_from' ],
 909                                 [
 910                                         'rd_from' => $this->getId(),
 911                                         'rd_namespace' => $rt->getNamespace(),
 912                                         'rd_title' => $rt->getDBkey(),
 913                                         'rd_fragment' => $rt->getFragment(),
 914                                         'rd_interwiki' => $rt->getInterwiki(),
 915                                 ],
 916                                 __METHOD__
 917                         );
 918                 }
 919
 920                 $dbw->endAtomic( __METHOD__ );
 921         }
 922
 923         /**
 924          * Get the Title object or URL this page redirects to
 925          *
 926          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 927          */
 928         public function followRedirect() {
 929                 return $this->getRedirectURL( $this->getRedirectTarget() );
 930         }
 931
 932         /**
 933          * Get the Title object or URL to use for a redirect. We use Title
 934          * objects for same-wiki, non-special redirects and URLs for everything
 935          * else.
 936          * @param Title $rt Redirect target
 937          * @return bool|Title|string False, Title object of local target, or string with URL
 938          */
 939         public function getRedirectURL( $rt ) {
 940                 if ( !$rt ) {
 941                         return false;
 942                 }
 943
 944                 if ( $rt->isExternal() ) {
 945                         if ( $rt->isLocal() ) {
 946                                 // Offsite wikis need an HTTP redirect.
 947                                 // This can be hard to reverse and may produce loops,
 948                                 // so they may be disabled in the site configuration.
 949                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 950                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 951                         } else {
 952                                 // External pages without "local" bit set are not valid
 953                                 // redirect targets
 954                                 return false;
 955                         }
 956                 }
 957
 958                 if ( $rt->isSpecialPage() ) {
 959                         // Gotta handle redirects to special pages differently:
 960                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 961                         // Some pages are not valid targets.
 962                         if ( $rt->isValidRedirectTarget() ) {
 963                                 return $rt->getFullURL();
 964                         } else {
 965                                 return false;
 966                         }
 967                 }
 968
 969                 return $rt;
 970         }
 971
 972         /**
 973          * Get a list of users who have edited this article, not including the user who made
 974          * the most recent revision, which you can get from $article->getUser() if you want it
 975          * @return UserArrayFromResult
 976          */
 977         public function getContributors() {
 978                 // @todo FIXME: This is expensive; cache this info somewhere.
 979
 980                 $dbr = wfGetDB( DB_SLAVE );
 981
 982                 if ( $dbr->implicitGroupby() ) {
 983                         $realNameField = 'user_real_name';
 984                 } else {
 985                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 986                 }
 987
 988                 $tables = [ 'revision', 'user' ];
 989
 990                 $fields = [
 991                         'user_id' => 'rev_user',
 992                         'user_name' => 'rev_user_text',
 993                         $realNameField,
 994                         'timestamp' => 'MAX(rev_timestamp)',
 995                 ];
 996
 997                 $conds = [ 'rev_page' => $this->getId() ];
 998
 999                 // The user who made the top revision gets credited as "this page was last edited by
1000                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1001                 $user = $this->getUser();
1002                 if ( $user ) {
1003                         $conds[] = "rev_user != $user";
1004                 } else {
1005                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1006                 }
1007
1008                 // Username hidden?
1009                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1010
1011                 $jconds = [
1012                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1013                 ];
1014
1015                 $options = [
1016                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1017                         'ORDER BY' => 'timestamp DESC',
1018                 ];
1019
1020                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1021                 return new UserArrayFromResult( $res );
1022         }
1023
1024         /**
1025          * Should the parser cache be used?
1026          *
1027          * @param ParserOptions $parserOptions ParserOptions to check
1028          * @param int $oldId
1029          * @return bool
1030          */
1031         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1032                 return $parserOptions->getStubThreshold() == 0
1033                         && $this->exists()
1034                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1035                         && $this->getContentHandler()->isParserCacheSupported();
1036         }
1037
1038         /**
1039          * Get a ParserOutput for the given ParserOptions and revision ID.
1040          *
1041          * The parser cache will be used if possible. Cache misses that result
1042          * in parser runs are debounced with PoolCounter.
1043          *
1044          * @since 1.19
1045          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1046          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1047          *                             get the current revision (default value)
1048          * @param bool          $forceParse Force reindexing, regardless of cache settings
1049          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1050          */
1051         public function getParserOutput( ParserOptions $parserOptions, $oldid = null,
1052                                          $forceParse = false ) {
1053
1054                 $useParserCache =
1055                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1056                 wfDebug( __METHOD__ .
1057                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1058                 if ( $parserOptions->getStubThreshold() ) {
1059                         wfIncrStats( 'pcache.miss.stub' );
1060                 }
1061
1062                 if ( $useParserCache ) {
1063                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1064                         if ( $parserOutput !== false ) {
1065                                 return $parserOutput;
1066                         }
1067                 }
1068
1069                 if ( $oldid === null || $oldid === 0 ) {
1070                         $oldid = $this->getLatest();
1071                 }
1072
1073                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1074                 $pool->execute();
1075
1076                 return $pool->getParserOutput();
1077         }
1078
1079         /**
1080          * Do standard deferred updates after page view (existing or missing page)
1081          * @param User $user The relevant user
1082          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1083          */
1084         public function doViewUpdates( User $user, $oldid = 0 ) {
1085                 if ( wfReadOnly() ) {
1086                         return;
1087                 }
1088
1089                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1090                 // Update newtalk / watchlist notification status
1091                 try {
1092                         $user->clearNotification( $this->mTitle, $oldid );
1093                 } catch ( DBError $e ) {
1094                         // Avoid outage if the master is not reachable
1095                         MWExceptionHandler::logException( $e );
1096                 }
1097         }
1098
1099         /**
1100          * Perform the actions of a page purging
1101          * @return bool
1102          */
1103         public function doPurge() {
1104                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1105                         return false;
1106                 }
1107
1108                 $this->mTitle->invalidateCache();
1109                 // Send purge after above page_touched update was committed
1110                 DeferredUpdates::addUpdate(
1111                         new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1112                         DeferredUpdates::PRESEND
1113                 );
1114
1115                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1116                         // @todo move this logic to MessageCache
1117                         if ( $this->exists() ) {
1118                                 // NOTE: use transclusion text for messages.
1119                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1120
1121                                 $content = $this->getContent();
1122                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1123
1124                                 if ( $text === null ) {
1125                                         $text = false;
1126                                 }
1127                         } else {
1128                                 $text = false;
1129                         }
1130
1131                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1132                 }
1133
1134                 return true;
1135         }
1136
1137         /**
1138          * Insert a new empty page record for this article.
1139          * This *must* be followed up by creating a revision
1140          * and running $this->updateRevisionOn( ... );
1141          * or else the record will be left in a funky state.
1142          * Best if all done inside a transaction.
1143          *
1144          * @param IDatabase $dbw
1145          * @param int|null $pageId Custom page ID that will be used for the insert statement
1146          *
1147          * @return bool|int The newly created page_id key; false if the title already existed
1148          */
1149         public function insertOn( $dbw, $pageId = null ) {
1150                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1151                 $dbw->insert(
1152                         'page',
1153                         [
1154                                 'page_id'           => $pageIdForInsert,
1155                                 'page_namespace'    => $this->mTitle->getNamespace(),
1156                                 'page_title'        => $this->mTitle->getDBkey(),
1157                                 'page_restrictions' => '',
1158                                 'page_is_redirect'  => 0, // Will set this shortly...
1159                                 'page_is_new'       => 1,
1160                                 'page_random'       => wfRandom(),
1161                                 'page_touched'      => $dbw->timestamp(),
1162                                 'page_latest'       => 0, // Fill this in shortly...
1163                                 'page_len'          => 0, // Fill this in shortly...
1164                         ],
1165                         __METHOD__,
1166                         'IGNORE'
1167                 );
1168
1169                 if ( $dbw->affectedRows() > 0 ) {
1170                         $newid = $pageId ?: $dbw->insertId();
1171                         $this->mId = $newid;
1172                         $this->mTitle->resetArticleID( $newid );
1173
1174                         return $newid;
1175                 } else {
1176                         return false; // nothing changed
1177                 }
1178         }
1179
1180         /**
1181          * Update the page record to point to a newly saved revision.
1182          *
1183          * @param IDatabase $dbw
1184          * @param Revision $revision For ID number, and text used to set
1185          *   length and redirect status fields
1186          * @param int $lastRevision If given, will not overwrite the page field
1187          *   when different from the currently set value.
1188          *   Giving 0 indicates the new page flag should be set on.
1189          * @param bool $lastRevIsRedirect If given, will optimize adding and
1190          *   removing rows in redirect table.
1191          * @return bool Success; false if the page row was missing or page_latest changed
1192          */
1193         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1194                 $lastRevIsRedirect = null
1195         ) {
1196                 global $wgContentHandlerUseDB;
1197
1198                 // Assertion to try to catch T92046
1199                 if ( (int)$revision->getId() === 0 ) {
1200                         throw new InvalidArgumentException(
1201                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1202                         );
1203                 }
1204
1205                 $content = $revision->getContent();
1206                 $len = $content ? $content->getSize() : 0;
1207                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1208
1209                 $conditions = [ 'page_id' => $this->getId() ];
1210
1211                 if ( !is_null( $lastRevision ) ) {
1212                         // An extra check against threads stepping on each other
1213                         $conditions['page_latest'] = $lastRevision;
1214                 }
1215
1216                 $row = [ /* SET */
1217                         'page_latest'      => $revision->getId(),
1218                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1219                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1220                         'page_is_redirect' => $rt !== null ? 1 : 0,
1221                         'page_len'         => $len,
1222                 ];
1223
1224                 if ( $wgContentHandlerUseDB ) {
1225                         $row['page_content_model'] = $revision->getContentModel();
1226                 }
1227
1228                 $dbw->update( 'page',
1229                         $row,
1230                         $conditions,
1231                         __METHOD__ );
1232
1233                 $result = $dbw->affectedRows() > 0;
1234                 if ( $result ) {
1235                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1236                         $this->setLastEdit( $revision );
1237                         $this->mLatest = $revision->getId();
1238                         $this->mIsRedirect = (bool)$rt;
1239                         // Update the LinkCache.
1240                         LinkCache::singleton()->addGoodLinkObj(
1241                                 $this->getId(),
1242                                 $this->mTitle,
1243                                 $len,
1244                                 $this->mIsRedirect,
1245                                 $this->mLatest,
1246                                 $revision->getContentModel()
1247                         );
1248                 }
1249
1250                 return $result;
1251         }
1252
1253         /**
1254          * Add row to the redirect table if this is a redirect, remove otherwise.
1255          *
1256          * @param IDatabase $dbw
1257          * @param Title $redirectTitle Title object pointing to the redirect target,
1258          *   or NULL if this is not a redirect
1259          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1260          *   removing rows in redirect table.
1261          * @return bool True on success, false on failure
1262          * @private
1263          */
1264         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1265                 // Always update redirects (target link might have changed)
1266                 // Update/Insert if we don't know if the last revision was a redirect or not
1267                 // Delete if changing from redirect to non-redirect
1268                 $isRedirect = !is_null( $redirectTitle );
1269
1270                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1271                         return true;
1272                 }
1273
1274                 if ( $isRedirect ) {
1275                         $this->insertRedirectEntry( $redirectTitle );
1276                 } else {
1277                         // This is not a redirect, remove row from redirect table
1278                         $where = [ 'rd_from' => $this->getId() ];
1279                         $dbw->delete( 'redirect', $where, __METHOD__ );
1280                 }
1281
1282                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1283                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1284                 }
1285
1286                 return ( $dbw->affectedRows() != 0 );
1287         }
1288
1289         /**
1290          * If the given revision is newer than the currently set page_latest,
1291          * update the page record. Otherwise, do nothing.
1292          *
1293          * @deprecated since 1.24, use updateRevisionOn instead
1294          *
1295          * @param IDatabase $dbw
1296          * @param Revision $revision
1297          * @return bool
1298          */
1299         public function updateIfNewerOn( $dbw, $revision ) {
1300
1301                 $row = $dbw->selectRow(
1302                         [ 'revision', 'page' ],
1303                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1304                         [
1305                                 'page_id' => $this->getId(),
1306                                 'page_latest=rev_id' ],
1307                         __METHOD__ );
1308
1309                 if ( $row ) {
1310                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1311                                 return false;
1312                         }
1313                         $prev = $row->rev_id;
1314                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1315                 } else {
1316                         // No or missing previous revision; mark the page as new
1317                         $prev = 0;
1318                         $lastRevIsRedirect = null;
1319                 }
1320
1321                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1322
1323                 return $ret;
1324         }
1325
1326         /**
1327          * Get the content that needs to be saved in order to undo all revisions
1328          * between $undo and $undoafter. Revisions must belong to the same page,
1329          * must exist and must not be deleted
1330          * @param Revision $undo
1331          * @param Revision $undoafter Must be an earlier revision than $undo
1332          * @return Content|bool Content on success, false on failure
1333          * @since 1.21
1334          * Before we had the Content object, this was done in getUndoText
1335          */
1336         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1337                 $handler = $undo->getContentHandler();
1338                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1339         }
1340
1341         /**
1342          * Returns true if this page's content model supports sections.
1343          *
1344          * @return bool
1345          *
1346          * @todo The skin should check this and not offer section functionality if
1347          *   sections are not supported.
1348          * @todo The EditPage should check this and not offer section functionality
1349          *   if sections are not supported.
1350          */
1351         public function supportsSections() {
1352                 return $this->getContentHandler()->supportsSections();
1353         }
1354
1355         /**
1356          * @param string|number|null|bool $sectionId Section identifier as a number or string
1357          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1358          * or 'new' for a new section.
1359          * @param Content $sectionContent New content of the section.
1360          * @param string $sectionTitle New section's subject, only if $section is "new".
1361          * @param string $edittime Revision timestamp or null to use the current revision.
1362          *
1363          * @throws MWException
1364          * @return Content|null New complete article content, or null if error.
1365          *
1366          * @since 1.21
1367          * @deprecated since 1.24, use replaceSectionAtRev instead
1368          */
1369         public function replaceSectionContent(
1370                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1371         ) {
1372
1373                 $baseRevId = null;
1374                 if ( $edittime && $sectionId !== 'new' ) {
1375                         $dbr = wfGetDB( DB_SLAVE );
1376                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1377                         // Try the master if this thread may have just added it.
1378                         // This could be abstracted into a Revision method, but we don't want
1379                         // to encourage loading of revisions by timestamp.
1380                         if ( !$rev
1381                                 && wfGetLB()->getServerCount() > 1
1382                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1383                         ) {
1384                                 $dbw = wfGetDB( DB_MASTER );
1385                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1386                         }
1387                         if ( $rev ) {
1388                                 $baseRevId = $rev->getId();
1389                         }
1390                 }
1391
1392                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1393         }
1394
1395         /**
1396          * @param string|number|null|bool $sectionId Section identifier as a number or string
1397          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1398          * or 'new' for a new section.
1399          * @param Content $sectionContent New content of the section.
1400          * @param string $sectionTitle New section's subject, only if $section is "new".
1401          * @param int|null $baseRevId
1402          *
1403          * @throws MWException
1404          * @return Content|null New complete article content, or null if error.
1405          *
1406          * @since 1.24
1407          */
1408         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1409                 $sectionTitle = '', $baseRevId = null
1410         ) {
1411
1412                 if ( strval( $sectionId ) === '' ) {
1413                         // Whole-page edit; let the whole text through
1414                         $newContent = $sectionContent;
1415                 } else {
1416                         if ( !$this->supportsSections() ) {
1417                                 throw new MWException( "sections not supported for content model " .
1418                                         $this->getContentHandler()->getModelID() );
1419                         }
1420
1421                         // Bug 30711: always use current version when adding a new section
1422                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1423                                 $oldContent = $this->getContent();
1424                         } else {
1425                                 $rev = Revision::newFromId( $baseRevId );
1426                                 if ( !$rev ) {
1427                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1428                                                 $this->getId() . "; section: $sectionId)\n" );
1429                                         return null;
1430                                 }
1431
1432                                 $oldContent = $rev->getContent();
1433                         }
1434
1435                         if ( !$oldContent ) {
1436                                 wfDebug( __METHOD__ . ": no page text\n" );
1437                                 return null;
1438                         }
1439
1440                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1441                 }
1442
1443                 return $newContent;
1444         }
1445
1446         /**
1447          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1448          * @param int $flags
1449          * @return int Updated $flags
1450          */
1451         public function checkFlags( $flags ) {
1452                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1453                         if ( $this->exists() ) {
1454                                 $flags |= EDIT_UPDATE;
1455                         } else {
1456                                 $flags |= EDIT_NEW;
1457                         }
1458                 }
1459
1460                 return $flags;
1461         }
1462
1463         /**
1464          * Change an existing article or create a new article. Updates RC and all necessary caches,
1465          * optionally via the deferred update array.
1466          *
1467          * @param string $text New text
1468          * @param string $summary Edit summary
1469          * @param int $flags Bitfield:
1470          *      EDIT_NEW
1471          *          Article is known or assumed to be non-existent, create a new one
1472          *      EDIT_UPDATE
1473          *          Article is known or assumed to be pre-existing, update it
1474          *      EDIT_MINOR
1475          *          Mark this edit minor, if the user is allowed to do so
1476          *      EDIT_SUPPRESS_RC
1477          *          Do not log the change in recentchanges
1478          *      EDIT_FORCE_BOT
1479          *          Mark the edit a "bot" edit regardless of user rights
1480          *      EDIT_AUTOSUMMARY
1481          *          Fill in blank summaries with generated text where possible
1482          *      EDIT_INTERNAL
1483          *          Signal that the page retrieve/save cycle happened entirely in this request.
1484          *
1485          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1486          * article will be detected. If EDIT_UPDATE is specified and the article
1487          * doesn't exist, the function will return an edit-gone-missing error. If
1488          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1489          * error will be returned. These two conditions are also possible with
1490          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1491          *
1492          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1493          *   This is not the parent revision ID, rather the revision ID for older
1494          *   content used as the source for a rollback, for example.
1495          * @param User $user The user doing the edit
1496          *
1497          * @throws MWException
1498          * @return Status Possible errors:
1499          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1500          *     set the fatal flag of $status
1501          *   edit-gone-missing: In update mode, but the article didn't exist.
1502          *   edit-conflict: In update mode, the article changed unexpectedly.
1503          *   edit-no-change: Warning that the text was the same as before.
1504          *   edit-already-exists: In creation mode, but the article already exists.
1505          *
1506          * Extensions may define additional errors.
1507          *
1508          * $return->value will contain an associative array with members as follows:
1509          *     new: Boolean indicating if the function attempted to create a new article.
1510          *     revision: The revision object for the inserted revision, or null.
1511          *
1512          * Compatibility note: this function previously returned a boolean value
1513          * indicating success/failure
1514          *
1515          * @deprecated since 1.21: use doEditContent() instead.
1516          */
1517         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1518                 ContentHandler::deprecated( __METHOD__, '1.21' );
1519
1520                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1521
1522                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1523         }
1524
1525         /**
1526          * Change an existing article or create a new article. Updates RC and all necessary caches,
1527          * optionally via the deferred update array.
1528          *
1529          * @param Content $content New content
1530          * @param string $summary Edit summary
1531          * @param int $flags Bitfield:
1532          *      EDIT_NEW
1533          *          Article is known or assumed to be non-existent, create a new one
1534          *      EDIT_UPDATE
1535          *          Article is known or assumed to be pre-existing, update it
1536          *      EDIT_MINOR
1537          *          Mark this edit minor, if the user is allowed to do so
1538          *      EDIT_SUPPRESS_RC
1539          *          Do not log the change in recentchanges
1540          *      EDIT_FORCE_BOT
1541          *          Mark the edit a "bot" edit regardless of user rights
1542          *      EDIT_AUTOSUMMARY
1543          *          Fill in blank summaries with generated text where possible
1544          *      EDIT_INTERNAL
1545          *          Signal that the page retrieve/save cycle happened entirely in this request.
1546          *
1547          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1548          * article will be detected. If EDIT_UPDATE is specified and the article
1549          * doesn't exist, the function will return an edit-gone-missing error. If
1550          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1551          * error will be returned. These two conditions are also possible with
1552          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1553          *
1554          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1555          *   This is not the parent revision ID, rather the revision ID for older
1556          *   content used as the source for a rollback, for example.
1557          * @param User $user The user doing the edit
1558          * @param string $serialFormat Format for storing the content in the
1559          *   database.
1560          * @param array|null $tags Change tags to apply to this edit
1561          * Callers are responsible for permission checks
1562          * (with ChangeTags::canAddTagsAccompanyingChange)
1563          *
1564          * @throws MWException
1565          * @return Status Possible errors:
1566          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1567          *       set the fatal flag of $status.
1568          *     edit-gone-missing: In update mode, but the article didn't exist.
1569          *     edit-conflict: In update mode, the article changed unexpectedly.
1570          *     edit-no-change: Warning that the text was the same as before.
1571          *     edit-already-exists: In creation mode, but the article already exists.
1572          *
1573          *  Extensions may define additional errors.
1574          *
1575          *  $return->value will contain an associative array with members as follows:
1576          *     new: Boolean indicating if the function attempted to create a new article.
1577          *     revision: The revision object for the inserted revision, or null.
1578          *
1579          * @since 1.21
1580          * @throws MWException
1581          */
1582         public function doEditContent(
1583                 Content $content, $summary, $flags = 0, $baseRevId = false,
1584                 User $user = null, $serialFormat = null, $tags = null
1585         ) {
1586                 global $wgUser, $wgUseAutomaticEditSummaries;
1587
1588                 // Low-level sanity check
1589                 if ( $this->mTitle->getText() === '' ) {
1590                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1591                 }
1592                 // Make sure the given content type is allowed for this page
1593                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1594                         return Status::newFatal( 'content-not-allowed-here',
1595                                 ContentHandler::getLocalizedName( $content->getModel() ),
1596                                 $this->mTitle->getPrefixedText()
1597                         );
1598                 }
1599
1600                 // Load the data from the master database if needed.
1601                 // The caller may already loaded it from the master or even loaded it using
1602                 // SELECT FOR UPDATE, so do not override that using clear().
1603                 $this->loadPageData( 'fromdbmaster' );
1604
1605                 $user = $user ?: $wgUser;
1606                 $flags = $this->checkFlags( $flags );
1607
1608                 // Trigger pre-save hook (using provided edit summary)
1609                 $hookStatus = Status::newGood( [] );
1610                 $hook_args = [ &$this, &$user, &$content, &$summary,
1611                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1612                 // Check if the hook rejected the attempted save
1613                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1614                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1615                 ) {
1616                         if ( $hookStatus->isOK() ) {
1617                                 // Hook returned false but didn't call fatal(); use generic message
1618                                 $hookStatus->fatal( 'edit-hook-aborted' );
1619                         }
1620
1621                         return $hookStatus;
1622                 }
1623
1624                 $old_revision = $this->getRevision(); // current revision
1625                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1626
1627                 // Provide autosummaries if one is not provided and autosummaries are enabled
1628                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1629                         $handler = $content->getContentHandler();
1630                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1631                 }
1632
1633                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1634                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1635                         $useCache = false;
1636                 } else {
1637                         $useCache = true;
1638                 }
1639
1640                 // Get the pre-save transform content and final parser output
1641                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1642                 $pstContent = $editInfo->pstContent; // Content object
1643                 $meta = [
1644                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1645                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1646                         'serialized' => $editInfo->pst,
1647                         'serialFormat' => $serialFormat,
1648                         'baseRevId' => $baseRevId,
1649                         'oldRevision' => $old_revision,
1650                         'oldContent' => $old_content,
1651                         'oldId' => $this->getLatest(),
1652                         'oldIsRedirect' => $this->isRedirect(),
1653                         'oldCountable' => $this->isCountable(),
1654                         'tags' => ( $tags !== null ) ? (array)$tags : []
1655                 ];
1656
1657                 // Actually create the revision and create/update the page
1658                 if ( $flags & EDIT_UPDATE ) {
1659                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1660                 } else {
1661                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1662                 }
1663
1664                 // Promote user to any groups they meet the criteria for
1665                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1666                         $user->addAutopromoteOnceGroups( 'onEdit' );
1667                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1668                 } );
1669
1670                 return $status;
1671         }
1672
1673         /**
1674          * @param Content $content Pre-save transform content
1675          * @param integer $flags
1676          * @param User $user
1677          * @param string $summary
1678          * @param array $meta
1679          * @return Status
1680          * @throws DBUnexpectedError
1681          * @throws Exception
1682          * @throws FatalError
1683          * @throws MWException
1684          */
1685         private function doModify(
1686                 Content $content, $flags, User $user, $summary, array $meta
1687         ) {
1688                 global $wgUseRCPatrol;
1689
1690                 // Update article, but only if changed.
1691                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1692
1693                 // Convenience variables
1694                 $now = wfTimestampNow();
1695                 $oldid = $meta['oldId'];
1696                 /** @var $oldContent Content|null */
1697                 $oldContent = $meta['oldContent'];
1698                 $newsize = $content->getSize();
1699
1700                 if ( !$oldid ) {
1701                         // Article gone missing
1702                         $status->fatal( 'edit-gone-missing' );
1703
1704                         return $status;
1705                 } elseif ( !$oldContent ) {
1706                         // Sanity check for bug 37225
1707                         throw new MWException( "Could not find text for current revision {$oldid}." );
1708                 }
1709
1710                 // @TODO: pass content object?!
1711                 $revision = new Revision( [
1712                         'page'       => $this->getId(),
1713                         'title'      => $this->mTitle, // for determining the default content model
1714                         'comment'    => $summary,
1715                         'minor_edit' => $meta['minor'],
1716                         'text'       => $meta['serialized'],
1717                         'len'        => $newsize,
1718                         'parent_id'  => $oldid,
1719                         'user'       => $user->getId(),
1720                         'user_text'  => $user->getName(),
1721                         'timestamp'  => $now,
1722                         'content_model' => $content->getModel(),
1723                         'content_format' => $meta['serialFormat'],
1724                 ] );
1725
1726                 $changed = !$content->equals( $oldContent );
1727
1728                 $dbw = wfGetDB( DB_MASTER );
1729
1730                 if ( $changed ) {
1731                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1732                         $status->merge( $prepStatus );
1733                         if ( !$status->isOK() ) {
1734                                 return $status;
1735                         }
1736
1737                         $dbw->startAtomic( __METHOD__ );
1738                         // Get the latest page_latest value while locking it.
1739                         // Do a CAS style check to see if it's the same as when this method
1740                         // started. If it changed then bail out before touching the DB.
1741                         $latestNow = $this->lockAndGetLatest();
1742                         if ( $latestNow != $oldid ) {
1743                                 $dbw->endAtomic( __METHOD__ );
1744                                 // Page updated or deleted in the mean time
1745                                 $status->fatal( 'edit-conflict' );
1746
1747                                 return $status;
1748                         }
1749
1750                         // At this point we are now comitted to returning an OK
1751                         // status unless some DB query error or other exception comes up.
1752                         // This way callers don't have to call rollback() if $status is bad
1753                         // unless they actually try to catch exceptions (which is rare).
1754
1755                         // Save the revision text
1756                         $revisionId = $revision->insertOn( $dbw );
1757                         // Update page_latest and friends to reflect the new revision
1758                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1759                                 $dbw->rollback( __METHOD__ ); // sanity; this should never happen
1760                                 throw new MWException( "Failed to update page row to use new revision." );
1761                         }
1762
1763                         Hooks::run( 'NewRevisionFromEditComplete',
1764                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1765
1766                         // Update recentchanges
1767                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1768                                 // Mark as patrolled if the user can do so
1769                                 $patrolled = $wgUseRCPatrol && !count(
1770                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1771                                 // Add RC row to the DB
1772                                 RecentChange::notifyEdit(
1773                                         $now,
1774                                         $this->mTitle,
1775                                         $revision->isMinor(),
1776                                         $user,
1777                                         $summary,
1778                                         $oldid,
1779                                         $this->getTimestamp(),
1780                                         $meta['bot'],
1781                                         '',
1782                                         $oldContent ? $oldContent->getSize() : 0,
1783                                         $newsize,
1784                                         $revisionId,
1785                                         $patrolled,
1786                                         $meta['tags']
1787                                 );
1788                         }
1789
1790                         $user->incEditCount();
1791
1792                         $dbw->endAtomic( __METHOD__ );
1793                         $this->mTimestamp = $now;
1794                 } else {
1795                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1796                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1797                         $revision->setId( $this->getLatest() );
1798                         $revision->setUserIdAndName(
1799                                 $this->getUser( Revision::RAW ),
1800                                 $this->getUserText( Revision::RAW )
1801                         );
1802                 }
1803
1804                 if ( $changed ) {
1805                         // Return the new revision to the caller
1806                         $status->value['revision'] = $revision;
1807                 } else {
1808                         $status->warning( 'edit-no-change' );
1809                         // Update page_touched as updateRevisionOn() was not called.
1810                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1811                         $this->mTitle->invalidateCache( $now );
1812                 }
1813
1814                 // Do secondary updates once the main changes have been committed...
1815                 DeferredUpdates::addUpdate(
1816                         new AtomicSectionUpdate(
1817                                 $dbw,
1818                                 __METHOD__,
1819                                 function () use (
1820                                         $revision, &$user, $content, $summary, &$flags,
1821                                         $changed, $meta, &$status
1822                                 ) {
1823                                         // Update links tables, site stats, etc.
1824                                         $this->doEditUpdates(
1825                                                 $revision,
1826                                                 $user,
1827                                                 [
1828                                                         'changed' => $changed,
1829                                                         'oldcountable' => $meta['oldCountable'],
1830                                                         'oldrevision' => $meta['oldRevision']
1831                                                 ]
1832                                         );
1833                                         // Trigger post-save hook
1834                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1835                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1836                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1837                                         Hooks::run( 'PageContentSaveComplete', $params );
1838                                 }
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                 DeferredUpdates::addUpdate(
1945                         new AtomicSectionUpdate(
1946                                 $dbw,
1947                                 __METHOD__,
1948                                 function () use (
1949                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1950                                 ) {
1951                                         // Update links, etc.
1952                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1953                                         // Trigger post-create hook
1954                                         $params = [ &$this, &$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
1967                 return $status;
1968         }
1969
1970         /**
1971          * Get parser options suitable for rendering the primary article wikitext
1972          *
1973          * @see ContentHandler::makeParserOptions
1974          *
1975          * @param IContextSource|User|string $context One of the following:
1976          *        - IContextSource: Use the User and the Language of the provided
1977          *          context
1978          *        - User: Use the provided User object and $wgLang for the language,
1979          *          so use an IContextSource object if possible.
1980          *        - 'canonical': Canonical options (anonymous user with default
1981          *          preferences and content language).
1982          * @return ParserOptions
1983          */
1984         public function makeParserOptions( $context ) {
1985                 $options = $this->getContentHandler()->makeParserOptions( $context );
1986
1987                 if ( $this->getTitle()->isConversionTable() ) {
1988                         // @todo ConversionTable should become a separate content model, so
1989                         // we don't need special cases like this one.
1990                         $options->disableContentConversion();
1991                 }
1992
1993                 return $options;
1994         }
1995
1996         /**
1997          * Prepare text which is about to be saved.
1998          * Returns a stdClass with source, pst and output members
1999          *
2000          * @param string $text
2001          * @param int|null $revid
2002          * @param User|null $user
2003          * @deprecated since 1.21: use prepareContentForEdit instead.
2004          * @return object
2005          */
2006         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2007                 ContentHandler::deprecated( __METHOD__, '1.21' );
2008                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2009                 return $this->prepareContentForEdit( $content, $revid, $user );
2010         }
2011
2012         /**
2013          * Prepare content which is about to be saved.
2014          * Returns a stdClass with source, pst and output members
2015          *
2016          * @param Content $content
2017          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2018          *        revision ID is also accepted, but this is deprecated.
2019          * @param User|null $user
2020          * @param string|null $serialFormat
2021          * @param bool $useCache Check shared prepared edit cache
2022          *
2023          * @return object
2024          *
2025          * @since 1.21
2026          */
2027         public function prepareContentForEdit(
2028                 Content $content, $revision = null, User $user = null,
2029                 $serialFormat = null, $useCache = true
2030         ) {
2031                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2032
2033                 if ( is_object( $revision ) ) {
2034                         $revid = $revision->getId();
2035                 } else {
2036                         $revid = $revision;
2037                         // This code path is deprecated, and nothing is known to
2038                         // use it, so performance here shouldn't be a worry.
2039                         if ( $revid !== null ) {
2040                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2041                         } else {
2042                                 $revision = null;
2043                         }
2044                 }
2045
2046                 $user = is_null( $user ) ? $wgUser : $user;
2047                 // XXX: check $user->getId() here???
2048
2049                 // Use a sane default for $serialFormat, see bug 57026
2050                 if ( $serialFormat === null ) {
2051                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2052                 }
2053
2054                 if ( $this->mPreparedEdit
2055                         && $this->mPreparedEdit->newContent
2056                         && $this->mPreparedEdit->newContent->equals( $content )
2057                         && $this->mPreparedEdit->revid == $revid
2058                         && $this->mPreparedEdit->format == $serialFormat
2059                         // XXX: also check $user here?
2060                 ) {
2061                         // Already prepared
2062                         return $this->mPreparedEdit;
2063                 }
2064
2065                 // The edit may have already been prepared via api.php?action=stashedit
2066                 $cachedEdit = $useCache && $wgAjaxEditStash
2067                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2068                         : false;
2069
2070                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2071                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2072
2073                 $edit = (object)[];
2074                 if ( $cachedEdit ) {
2075                         $edit->timestamp = $cachedEdit->timestamp;
2076                 } else {
2077                         $edit->timestamp = wfTimestampNow();
2078                 }
2079                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2080                 $edit->revid = $revid;
2081
2082                 if ( $cachedEdit ) {
2083                         $edit->pstContent = $cachedEdit->pstContent;
2084                 } else {
2085                         $edit->pstContent = $content
2086                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2087                                 : null;
2088                 }
2089
2090                 $edit->format = $serialFormat;
2091                 $edit->popts = $this->makeParserOptions( 'canonical' );
2092                 if ( $cachedEdit ) {
2093                         $edit->output = $cachedEdit->output;
2094                 } else {
2095                         if ( $revision ) {
2096                                 // We get here if vary-revision is set. This means that this page references
2097                                 // itself (such as via self-transclusion). In this case, we need to make sure
2098                                 // that any such self-references refer to the newly-saved revision, and not
2099                                 // to the previous one, which could otherwise happen due to slave lag.
2100                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2101                                 $edit->popts->setCurrentRevisionCallback(
2102                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2103                                                 if ( $title->equals( $revision->getTitle() ) ) {
2104                                                         return $revision;
2105                                                 } else {
2106                                                         return call_user_func( $oldCallback, $title, $parser );
2107                                                 }
2108                                         }
2109                                 );
2110                         } else {
2111                                 // Try to avoid a second parse if {{REVISIONID}} is used
2112                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2113                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2114                                                 'revision',
2115                                                 'MAX(rev_id)',
2116                                                 [],
2117                                                 __METHOD__
2118                                         );
2119                                 } );
2120                         }
2121                         $edit->output = $edit->pstContent
2122                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2123                                 : null;
2124                 }
2125
2126                 $edit->newContent = $content;
2127                 $edit->oldContent = $this->getContent( Revision::RAW );
2128
2129                 // NOTE: B/C for hooks! don't use these fields!
2130                 $edit->newText = $edit->newContent
2131                         ? ContentHandler::getContentText( $edit->newContent )
2132                         : '';
2133                 $edit->oldText = $edit->oldContent
2134                         ? ContentHandler::getContentText( $edit->oldContent )
2135                         : '';
2136                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2137
2138                 if ( $edit->output ) {
2139                         $edit->output->setCacheTime( wfTimestampNow() );
2140                 }
2141
2142                 // Process cache the result
2143                 $this->mPreparedEdit = $edit;
2144
2145                 return $edit;
2146         }
2147
2148         /**
2149          * Do standard deferred updates after page edit.
2150          * Update links tables, site stats, search index and message cache.
2151          * Purges pages that include this page if the text was changed here.
2152          * Every 100th edit, prune the recent changes table.
2153          *
2154          * @param Revision $revision
2155          * @param User $user User object that did the revision
2156          * @param array $options Array of options, following indexes are used:
2157          * - changed: boolean, whether the revision changed the content (default true)
2158          * - created: boolean, whether the revision created the page (default false)
2159          * - moved: boolean, whether the page was moved (default false)
2160          * - restored: boolean, whether the page was undeleted (default false)
2161          * - oldrevision: Revision object for the pre-update revision (default null)
2162          * - oldcountable: boolean, null, or string 'no-change' (default null):
2163          *   - boolean: whether the page was counted as an article before that
2164          *     revision, only used in changed is true and created is false
2165          *   - null: if created is false, don't update the article count; if created
2166          *     is true, do update the article count
2167          *   - 'no-change': don't update the article count, ever
2168          */
2169         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2170                 global $wgRCWatchCategoryMembership, $wgContLang;
2171
2172                 $options += [
2173                         'changed' => true,
2174                         'created' => false,
2175                         'moved' => false,
2176                         'restored' => false,
2177                         'oldrevision' => null,
2178                         'oldcountable' => null
2179                 ];
2180                 $content = $revision->getContent();
2181
2182                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2183
2184                 // See if the parser output before $revision was inserted is still valid
2185                 $editInfo = false;
2186                 if ( !$this->mPreparedEdit ) {
2187                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2188                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2189                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2190                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2191                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2192                 ) {
2193                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2194                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2195                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2196                 } else {
2197                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2198                         $editInfo = $this->mPreparedEdit;
2199                 }
2200
2201                 if ( !$editInfo ) {
2202                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2203                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2204                         // as any prepared content from there or in doEditContent() was already rejected.
2205                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2206                 }
2207
2208                 // Save it to the parser cache.
2209                 // Make sure the cache time matches page_touched to avoid double parsing.
2210                 ParserCache::singleton()->save(
2211                         $editInfo->output, $this, $editInfo->popts,
2212                         $revision->getTimestamp(), $editInfo->revid
2213                 );
2214
2215                 // Update the links tables and other secondary data
2216                 if ( $content ) {
2217                         $recursive = $options['changed']; // bug 50785
2218                         $updates = $content->getSecondaryDataUpdates(
2219                                 $this->getTitle(), null, $recursive, $editInfo->output
2220                         );
2221                         foreach ( $updates as $update ) {
2222                                 if ( $update instanceof LinksUpdate ) {
2223                                         $update->setRevision( $revision );
2224                                         $update->setTriggeringUser( $user );
2225                                 }
2226                                 DeferredUpdates::addUpdate( $update );
2227                         }
2228                         if ( $wgRCWatchCategoryMembership
2229                                 && $this->getContentHandler()->supportsCategories() === true
2230                                 && ( $options['changed'] || $options['created'] )
2231                                 && !$options['restored']
2232                         ) {
2233                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2234                                 // the recent change entry (also done via deferred updates) and carry over any
2235                                 // bot/deletion/IP flags, ect.
2236                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2237                                         $this->getTitle(),
2238                                         [
2239                                                 'pageId' => $this->getId(),
2240                                                 'revTimestamp' => $revision->getTimestamp()
2241                                         ]
2242                                 ) );
2243                         }
2244                 }
2245
2246                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2247
2248                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2249                         // Flush old entries from the `recentchanges` table
2250                         if ( mt_rand( 0, 9 ) == 0 ) {
2251                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2252                         }
2253                 }
2254
2255                 if ( !$this->exists() ) {
2256                         return;
2257                 }
2258
2259                 $id = $this->getId();
2260                 $title = $this->mTitle->getPrefixedDBkey();
2261                 $shortTitle = $this->mTitle->getDBkey();
2262
2263                 if ( $options['oldcountable'] === 'no-change' ||
2264                         ( !$options['changed'] && !$options['moved'] )
2265                 ) {
2266                         $good = 0;
2267                 } elseif ( $options['created'] ) {
2268                         $good = (int)$this->isCountable( $editInfo );
2269                 } elseif ( $options['oldcountable'] !== null ) {
2270                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2271                 } else {
2272                         $good = 0;
2273                 }
2274                 $edits = $options['changed'] ? 1 : 0;
2275                 $total = $options['created'] ? 1 : 0;
2276
2277                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2278                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2279
2280                 // If this is another user's talk page, update newtalk.
2281                 // Don't do this if $options['changed'] = false (null-edits) nor if
2282                 // it's a minor edit and the user doesn't want notifications for those.
2283                 if ( $options['changed']
2284                         && $this->mTitle->getNamespace() == NS_USER_TALK
2285                         && $shortTitle != $user->getTitleKey()
2286                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2287                 ) {
2288                         $recipient = User::newFromName( $shortTitle, false );
2289                         if ( !$recipient ) {
2290                                 wfDebug( __METHOD__ . ": invalid username\n" );
2291                         } else {
2292                                 // Allow extensions to prevent user notification
2293                                 // when a new message is added to their talk page
2294                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2295                                         if ( User::isIP( $shortTitle ) ) {
2296                                                 // An anonymous user
2297                                                 $recipient->setNewtalk( true, $revision );
2298                                         } elseif ( $recipient->isLoggedIn() ) {
2299                                                 $recipient->setNewtalk( true, $revision );
2300                                         } else {
2301                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2302                                         }
2303                                 }
2304                         }
2305                 }
2306
2307                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2308                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2309                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2310                         if ( $msgtext === false || $msgtext === null ) {
2311                                 $msgtext = '';
2312                         }
2313
2314                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2315
2316                         if ( $wgContLang->hasVariants() ) {
2317                                 $wgContLang->updateConversionTable( $this->mTitle );
2318                         }
2319                 }
2320
2321                 if ( $options['created'] ) {
2322                         self::onArticleCreate( $this->mTitle );
2323                 } elseif ( $options['changed'] ) { // bug 50785
2324                         self::onArticleEdit( $this->mTitle, $revision );
2325                 }
2326         }
2327
2328         /**
2329          * Edit an article without doing all that other stuff
2330          * The article must already exist; link tables etc
2331          * are not updated, caches are not flushed.
2332          *
2333          * @param Content $content Content submitted
2334          * @param User $user The relevant user
2335          * @param string $comment Comment submitted
2336          * @param bool $minor Whereas it's a minor modification
2337          * @param string $serialFormat Format for storing the content in the database
2338          */
2339         public function doQuickEditContent(
2340                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2341         ) {
2342
2343                 $serialized = $content->serialize( $serialFormat );
2344
2345                 $dbw = wfGetDB( DB_MASTER );
2346                 $revision = new Revision( [
2347                         'title'      => $this->getTitle(), // for determining the default content model
2348                         'page'       => $this->getId(),
2349                         'user_text'  => $user->getName(),
2350                         'user'       => $user->getId(),
2351                         'text'       => $serialized,
2352                         'length'     => $content->getSize(),
2353                         'comment'    => $comment,
2354                         'minor_edit' => $minor ? 1 : 0,
2355                 ] ); // XXX: set the content object?
2356                 $revision->insertOn( $dbw );
2357                 $this->updateRevisionOn( $dbw, $revision );
2358
2359                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2360
2361         }
2362
2363         /**
2364          * Update the article's restriction field, and leave a log entry.
2365          * This works for protection both existing and non-existing pages.
2366          *
2367          * @param array $limit Set of restriction keys
2368          * @param array $expiry Per restriction type expiration
2369          * @param int &$cascade Set to false if cascading protection isn't allowed.
2370          * @param string $reason
2371          * @param User $user The user updating the restrictions
2372          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2373          *   ($user should be able to add the specified tags before this is called)
2374          * @return Status Status object; if action is taken, $status->value is the log_id of the
2375          *   protection log entry.
2376          */
2377         public function doUpdateRestrictions( array $limit, array $expiry,
2378                 &$cascade, $reason, User $user, $tags = null
2379         ) {
2380                 global $wgCascadingRestrictionLevels, $wgContLang;
2381
2382                 if ( wfReadOnly() ) {
2383                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2384                 }
2385
2386                 $this->loadPageData( 'fromdbmaster' );
2387                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2388                 $id = $this->getId();
2389
2390                 if ( !$cascade ) {
2391                         $cascade = false;
2392                 }
2393
2394                 // Take this opportunity to purge out expired restrictions
2395                 Title::purgeExpiredRestrictions();
2396
2397                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2398                 // we expect a single selection, but the schema allows otherwise.
2399                 $isProtected = false;
2400                 $protect = false;
2401                 $changed = false;
2402
2403                 $dbw = wfGetDB( DB_MASTER );
2404
2405                 foreach ( $restrictionTypes as $action ) {
2406                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2407                                 $expiry[$action] = 'infinity';
2408                         }
2409                         if ( !isset( $limit[$action] ) ) {
2410                                 $limit[$action] = '';
2411                         } elseif ( $limit[$action] != '' ) {
2412                                 $protect = true;
2413                         }
2414
2415                         // Get current restrictions on $action
2416                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2417                         if ( $current != '' ) {
2418                                 $isProtected = true;
2419                         }
2420
2421                         if ( $limit[$action] != $current ) {
2422                                 $changed = true;
2423                         } elseif ( $limit[$action] != '' ) {
2424                                 // Only check expiry change if the action is actually being
2425                                 // protected, since expiry does nothing on an not-protected
2426                                 // action.
2427                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2428                                         $changed = true;
2429                                 }
2430                         }
2431                 }
2432
2433                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2434                         $changed = true;
2435                 }
2436
2437                 // If nothing has changed, do nothing
2438                 if ( !$changed ) {
2439                         return Status::newGood();
2440                 }
2441
2442                 if ( !$protect ) { // No protection at all means unprotection
2443                         $revCommentMsg = 'unprotectedarticle';
2444                         $logAction = 'unprotect';
2445                 } elseif ( $isProtected ) {
2446                         $revCommentMsg = 'modifiedarticleprotection';
2447                         $logAction = 'modify';
2448                 } else {
2449                         $revCommentMsg = 'protectedarticle';
2450                         $logAction = 'protect';
2451                 }
2452
2453                 // Truncate for whole multibyte characters
2454                 $reason = $wgContLang->truncate( $reason, 255 );
2455
2456                 $logRelationsValues = [];
2457                 $logRelationsField = null;
2458                 $logParamsDetails = [];
2459
2460                 // Null revision (used for change tag insertion)
2461                 $nullRevision = null;
2462
2463                 if ( $id ) { // Protection of existing page
2464                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2465                                 return Status::newGood();
2466                         }
2467
2468                         // Only certain restrictions can cascade...
2469                         $editrestriction = isset( $limit['edit'] )
2470                                 ? [ $limit['edit'] ]
2471                                 : $this->mTitle->getRestrictions( 'edit' );
2472                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2473                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2474                         }
2475                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2476                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2477                         }
2478
2479                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2480                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2481                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2482                         }
2483                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2484                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2485                         }
2486
2487                         // The schema allows multiple restrictions
2488                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2489                                 $cascade = false;
2490                         }
2491
2492                         // insert null revision to identify the page protection change as edit summary
2493                         $latest = $this->getLatest();
2494                         $nullRevision = $this->insertProtectNullRevision(
2495                                 $revCommentMsg,
2496                                 $limit,
2497                                 $expiry,
2498                                 $cascade,
2499                                 $reason,
2500                                 $user
2501                         );
2502
2503                         if ( $nullRevision === null ) {
2504                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2505                         }
2506
2507                         $logRelationsField = 'pr_id';
2508
2509                         // Update restrictions table
2510                         foreach ( $limit as $action => $restrictions ) {
2511                                 $dbw->delete(
2512                                         'page_restrictions',
2513                                         [
2514                                                 'pr_page' => $id,
2515                                                 'pr_type' => $action
2516                                         ],
2517                                         __METHOD__
2518                                 );
2519                                 if ( $restrictions != '' ) {
2520                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2521                                         $dbw->insert(
2522                                                 'page_restrictions',
2523                                                 [
2524                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2525                                                         'pr_page' => $id,
2526                                                         'pr_type' => $action,
2527                                                         'pr_level' => $restrictions,
2528                                                         'pr_cascade' => $cascadeValue,
2529                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2530                                                 ],
2531                                                 __METHOD__
2532                                         );
2533                                         $logRelationsValues[] = $dbw->insertId();
2534                                         $logParamsDetails[] = [
2535                                                 'type' => $action,
2536                                                 'level' => $restrictions,
2537                                                 'expiry' => $expiry[$action],
2538                                                 'cascade' => (bool)$cascadeValue,
2539                                         ];
2540                                 }
2541                         }
2542
2543                         // Clear out legacy restriction fields
2544                         $dbw->update(
2545                                 'page',
2546                                 [ 'page_restrictions' => '' ],
2547                                 [ 'page_id' => $id ],
2548                                 __METHOD__
2549                         );
2550
2551                         Hooks::run( 'NewRevisionFromEditComplete',
2552                                 [ $this, $nullRevision, $latest, $user ] );
2553                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2554                 } else { // Protection of non-existing page (also known as "title protection")
2555                         // Cascade protection is meaningless in this case
2556                         $cascade = false;
2557
2558                         if ( $limit['create'] != '' ) {
2559                                 $dbw->replace( 'protected_titles',
2560                                         [ [ 'pt_namespace', 'pt_title' ] ],
2561                                         [
2562                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2563                                                 'pt_title' => $this->mTitle->getDBkey(),
2564                                                 'pt_create_perm' => $limit['create'],
2565                                                 'pt_timestamp' => $dbw->timestamp(),
2566                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2567                                                 'pt_user' => $user->getId(),
2568                                                 'pt_reason' => $reason,
2569                                         ], __METHOD__
2570                                 );
2571                                 $logParamsDetails[] = [
2572                                         'type' => 'create',
2573                                         'level' => $limit['create'],
2574                                         'expiry' => $expiry['create'],
2575                                 ];
2576                         } else {
2577                                 $dbw->delete( 'protected_titles',
2578                                         [
2579                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2580                                                 'pt_title' => $this->mTitle->getDBkey()
2581                                         ], __METHOD__
2582                                 );
2583                         }
2584                 }
2585
2586                 $this->mTitle->flushRestrictions();
2587                 InfoAction::invalidateCache( $this->mTitle );
2588
2589                 if ( $logAction == 'unprotect' ) {
2590                         $params = [];
2591                 } else {
2592                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2593                         $params = [
2594                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2595                                 '5:bool:cascade' => $cascade,
2596                                 'details' => $logParamsDetails, // parameter for localize and api
2597                         ];
2598                 }
2599
2600                 // Update the protection log
2601                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2602                 $logEntry->setTarget( $this->mTitle );
2603                 $logEntry->setComment( $reason );
2604                 $logEntry->setPerformer( $user );
2605                 $logEntry->setParameters( $params );
2606                 if ( !is_null( $nullRevision ) ) {
2607                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2608                 }
2609                 $logEntry->setTags( $tags );
2610                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2611                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2612                 }
2613                 $logId = $logEntry->insert();
2614                 $logEntry->publish( $logId );
2615
2616                 return Status::newGood( $logId );
2617         }
2618
2619         /**
2620          * Insert a new null revision for this page.
2621          *
2622          * @param string $revCommentMsg Comment message key for the revision
2623          * @param array $limit Set of restriction keys
2624          * @param array $expiry Per restriction type expiration
2625          * @param int $cascade Set to false if cascading protection isn't allowed.
2626          * @param string $reason
2627          * @param User|null $user
2628          * @return Revision|null Null on error
2629          */
2630         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2631                 array $expiry, $cascade, $reason, $user = null
2632         ) {
2633                 global $wgContLang;
2634                 $dbw = wfGetDB( DB_MASTER );
2635
2636                 // Prepare a null revision to be added to the history
2637                 $editComment = $wgContLang->ucfirst(
2638                         wfMessage(
2639                                 $revCommentMsg,
2640                                 $this->mTitle->getPrefixedText()
2641                         )->inContentLanguage()->text()
2642                 );
2643                 if ( $reason ) {
2644                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2645                 }
2646                 $protectDescription = $this->protectDescription( $limit, $expiry );
2647                 if ( $protectDescription ) {
2648                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2649                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2650                                 ->inContentLanguage()->text();
2651                 }
2652                 if ( $cascade ) {
2653                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2654                         $editComment .= wfMessage( 'brackets' )->params(
2655                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2656                         )->inContentLanguage()->text();
2657                 }
2658
2659                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2660                 if ( $nullRev ) {
2661                         $nullRev->insertOn( $dbw );
2662
2663                         // Update page record and touch page
2664                         $oldLatest = $nullRev->getParentId();
2665                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2666                 }
2667
2668                 return $nullRev;
2669         }
2670
2671         /**
2672          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2673          * @return string
2674          */
2675         protected function formatExpiry( $expiry ) {
2676                 global $wgContLang;
2677
2678                 if ( $expiry != 'infinity' ) {
2679                         return wfMessage(
2680                                 'protect-expiring',
2681                                 $wgContLang->timeanddate( $expiry, false, false ),
2682                                 $wgContLang->date( $expiry, false, false ),
2683                                 $wgContLang->time( $expiry, false, false )
2684                         )->inContentLanguage()->text();
2685                 } else {
2686                         return wfMessage( 'protect-expiry-indefinite' )
2687                                 ->inContentLanguage()->text();
2688                 }
2689         }
2690
2691         /**
2692          * Builds the description to serve as comment for the edit.
2693          *
2694          * @param array $limit Set of restriction keys
2695          * @param array $expiry Per restriction type expiration
2696          * @return string
2697          */
2698         public function protectDescription( array $limit, array $expiry ) {
2699                 $protectDescription = '';
2700
2701                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2702                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2703                         # All possible message keys are listed here for easier grepping:
2704                         # * restriction-create
2705                         # * restriction-edit
2706                         # * restriction-move
2707                         # * restriction-upload
2708                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2709                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2710                         # with '' filtered out. All possible message keys are listed below:
2711                         # * protect-level-autoconfirmed
2712                         # * protect-level-sysop
2713                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2714                                 ->inContentLanguage()->text();
2715
2716                         $expiryText = $this->formatExpiry( $expiry[$action] );
2717
2718                         if ( $protectDescription !== '' ) {
2719                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2720                         }
2721                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2722                                 ->params( $actionText, $restrictionsText, $expiryText )
2723                                 ->inContentLanguage()->text();
2724                 }
2725
2726                 return $protectDescription;
2727         }
2728
2729         /**
2730          * Builds the description to serve as comment for the log entry.
2731          *
2732          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2733          * protect description text. Keep them in old format to avoid breaking compatibility.
2734          * TODO: Fix protection log to store structured description and format it on-the-fly.
2735          *
2736          * @param array $limit Set of restriction keys
2737          * @param array $expiry Per restriction type expiration
2738          * @return string
2739          */
2740         public function protectDescriptionLog( array $limit, array $expiry ) {
2741                 global $wgContLang;
2742
2743                 $protectDescriptionLog = '';
2744
2745                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2746                         $expiryText = $this->formatExpiry( $expiry[$action] );
2747                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2748                                 "[$action=$restrictions] ($expiryText)";
2749                 }
2750
2751                 return trim( $protectDescriptionLog );
2752         }
2753
2754         /**
2755          * Take an array of page restrictions and flatten it to a string
2756          * suitable for insertion into the page_restrictions field.
2757          *
2758          * @param string[] $limit
2759          *
2760          * @throws MWException
2761          * @return string
2762          */
2763         protected static function flattenRestrictions( $limit ) {
2764                 if ( !is_array( $limit ) ) {
2765                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2766                 }
2767
2768                 $bits = [];
2769                 ksort( $limit );
2770
2771                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2772                         $bits[] = "$action=$restrictions";
2773                 }
2774
2775                 return implode( ':', $bits );
2776         }
2777
2778         /**
2779          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2780          * backwards compatibility, if you care about error reporting you should use
2781          * doDeleteArticleReal() instead.
2782          *
2783          * Deletes the article with database consistency, writes logs, purges caches
2784          *
2785          * @param string $reason Delete reason for deletion log
2786          * @param bool $suppress Suppress all revisions and log the deletion in
2787          *        the suppression log instead of the deletion log
2788          * @param int $u1 Unused
2789          * @param bool $u2 Unused
2790          * @param array|string &$error Array of errors to append to
2791          * @param User $user The deleting user
2792          * @return bool True if successful
2793          */
2794         public function doDeleteArticle(
2795                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2796         ) {
2797                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2798                 return $status->isGood();
2799         }
2800
2801         /**
2802          * Back-end article deletion
2803          * Deletes the article with database consistency, writes logs, purges caches
2804          *
2805          * @since 1.19
2806          *
2807          * @param string $reason Delete reason for deletion log
2808          * @param bool $suppress Suppress all revisions and log the deletion in
2809          *   the suppression log instead of the deletion log
2810          * @param int $u1 Unused
2811          * @param bool $u2 Unused
2812          * @param array|string &$error Array of errors to append to
2813          * @param User $user The deleting user
2814          * @return Status Status object; if successful, $status->value is the log_id of the
2815          *   deletion log entry. If the page couldn't be deleted because it wasn't
2816          *   found, $status is a non-fatal 'cannotdelete' error
2817          */
2818         public function doDeleteArticleReal(
2819                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2820         ) {
2821                 global $wgUser, $wgContentHandlerUseDB;
2822
2823                 wfDebug( __METHOD__ . "\n" );
2824
2825                 $status = Status::newGood();
2826
2827                 if ( $this->mTitle->getDBkey() === '' ) {
2828                         $status->error( 'cannotdelete',
2829                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2830                         return $status;
2831                 }
2832
2833                 $user = is_null( $user ) ? $wgUser : $user;
2834                 if ( !Hooks::run( 'ArticleDelete',
2835                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2836                 ) ) {
2837                         if ( $status->isOK() ) {
2838                                 // Hook aborted but didn't set a fatal status
2839                                 $status->fatal( 'delete-hook-aborted' );
2840                         }
2841                         return $status;
2842                 }
2843
2844                 $dbw = wfGetDB( DB_MASTER );
2845                 $dbw->startAtomic( __METHOD__ );
2846
2847                 $this->loadPageData( self::READ_LATEST );
2848                 $id = $this->getId();
2849                 // T98706: lock the page from various other updates but avoid using
2850                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2851                 // the revisions queries (which also JOIN on user). Only lock the page
2852                 // row and CAS check on page_latest to see if the trx snapshot matches.
2853                 $lockedLatest = $this->lockAndGetLatest();
2854                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2855                         $dbw->endAtomic( __METHOD__ );
2856                         // Page not there or trx snapshot is stale
2857                         $status->error( 'cannotdelete',
2858                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2859                         return $status;
2860                 }
2861
2862                 // At this point we are now comitted to returning an OK
2863                 // status unless some DB query error or other exception comes up.
2864                 // This way callers don't have to call rollback() if $status is bad
2865                 // unless they actually try to catch exceptions (which is rare).
2866
2867                 // we need to remember the old content so we can use it to generate all deletion updates.
2868                 $content = $this->getContent( Revision::RAW );
2869
2870                 // Bitfields to further suppress the content
2871                 if ( $suppress ) {
2872                         $bitfield = 0;
2873                         // This should be 15...
2874                         $bitfield |= Revision::DELETED_TEXT;
2875                         $bitfield |= Revision::DELETED_COMMENT;
2876                         $bitfield |= Revision::DELETED_USER;
2877                         $bitfield |= Revision::DELETED_RESTRICTED;
2878                 } else {
2879                         $bitfield = 'rev_deleted';
2880                 }
2881
2882                 /**
2883                  * For now, shunt the revision data into the archive table.
2884                  * Text is *not* removed from the text table; bulk storage
2885                  * is left intact to avoid breaking block-compression or
2886                  * immutable storage schemes.
2887                  *
2888                  * For backwards compatibility, note that some older archive
2889                  * table entries will have ar_text and ar_flags fields still.
2890                  *
2891                  * In the future, we may keep revisions and mark them with
2892                  * the rev_deleted field, which is reserved for this purpose.
2893                  */
2894
2895                 $row = [
2896                         'ar_namespace'  => 'page_namespace',
2897                         'ar_title'      => 'page_title',
2898                         'ar_comment'    => 'rev_comment',
2899                         'ar_user'       => 'rev_user',
2900                         'ar_user_text'  => 'rev_user_text',
2901                         'ar_timestamp'  => 'rev_timestamp',
2902                         'ar_minor_edit' => 'rev_minor_edit',
2903                         'ar_rev_id'     => 'rev_id',
2904                         'ar_parent_id'  => 'rev_parent_id',
2905                         'ar_text_id'    => 'rev_text_id',
2906                         'ar_text'       => '\'\'', // Be explicit to appease
2907                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2908                         'ar_len'        => 'rev_len',
2909                         'ar_page_id'    => 'page_id',
2910                         'ar_deleted'    => $bitfield,
2911                         'ar_sha1'       => 'rev_sha1',
2912                 ];
2913
2914                 if ( $wgContentHandlerUseDB ) {
2915                         $row['ar_content_model'] = 'rev_content_model';
2916                         $row['ar_content_format'] = 'rev_content_format';
2917                 }
2918
2919                 // Copy all the page revisions into the archive table
2920                 $dbw->insertSelect(
2921                         'archive',
2922                         [ 'page', 'revision' ],
2923                         $row,
2924                         [
2925                                 'page_id' => $id,
2926                                 'page_id = rev_page'
2927                         ],
2928                         __METHOD__
2929                 );
2930
2931                 // Now that it's safely backed up, delete it
2932                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2933
2934                 if ( !$dbw->cascadingDeletes() ) {
2935                         $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2936                 }
2937
2938                 // Clone the title, so we have the information we need when we log
2939                 $logTitle = clone $this->mTitle;
2940
2941                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2942                 $logtype = $suppress ? 'suppress' : 'delete';
2943
2944                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2945                 $logEntry->setPerformer( $user );
2946                 $logEntry->setTarget( $logTitle );
2947                 $logEntry->setComment( $reason );
2948                 $logid = $logEntry->insert();
2949
2950                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2951                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2952                         $logEntry->publish( $logid );
2953                 } );
2954
2955                 $dbw->endAtomic( __METHOD__ );
2956
2957                 $this->doDeleteUpdates( $id, $content );
2958
2959                 Hooks::run( 'ArticleDeleteComplete',
2960                         [ &$this, &$user, $reason, $id, $content, $logEntry ] );
2961                 $status->value = $logid;
2962
2963                 // Show log excerpt on 404 pages rather than just a link
2964                 $cache = ObjectCache::getMainStashInstance();
2965                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2966                 $cache->set( $key, 1, $cache::TTL_DAY );
2967
2968                 return $status;
2969         }
2970
2971         /**
2972          * Lock the page row for this title+id and return page_latest (or 0)
2973          *
2974          * @return integer Returns 0 if no row was found with this title+id
2975          * @since 1.27
2976          */
2977         public function lockAndGetLatest() {
2978                 return (int)wfGetDB( DB_MASTER )->selectField(
2979                         'page',
2980                         'page_latest',
2981                         [
2982                                 'page_id' => $this->getId(),
2983                                 // Typically page_id is enough, but some code might try to do
2984                                 // updates assuming the title is the same, so verify that
2985                                 'page_namespace' => $this->getTitle()->getNamespace(),
2986                                 'page_title' => $this->getTitle()->getDBkey()
2987                         ],
2988                         __METHOD__,
2989                         [ 'FOR UPDATE' ]
2990                 );
2991         }
2992
2993         /**
2994          * Do some database updates after deletion
2995          *
2996          * @param int $id The page_id value of the page being deleted
2997          * @param Content $content Optional page content to be used when determining
2998          *   the required updates. This may be needed because $this->getContent()
2999          *   may already return null when the page proper was deleted.
3000          */
3001         public function doDeleteUpdates( $id, Content $content = null ) {
3002                 // Update site status
3003                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
3004
3005                 // Delete pagelinks, update secondary indexes, etc
3006                 $updates = $this->getDeletionUpdates( $content );
3007                 foreach ( $updates as $update ) {
3008                         DeferredUpdates::addUpdate( $update );
3009                 }
3010
3011                 // Reparse any pages transcluding this page
3012                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3013
3014                 // Reparse any pages including this image
3015                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3016                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3017                 }
3018
3019                 // Clear caches
3020                 WikiPage::onArticleDelete( $this->mTitle );
3021
3022                 // Reset this object and the Title object
3023                 $this->loadFromRow( false, self::READ_LATEST );
3024
3025                 // Search engine
3026                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3027         }
3028
3029         /**
3030          * Roll back the most recent consecutive set of edits to a page
3031          * from the same user; fails if there are no eligible edits to
3032          * roll back to, e.g. user is the sole contributor. This function
3033          * performs permissions checks on $user, then calls commitRollback()
3034          * to do the dirty work
3035          *
3036          * @todo Separate the business/permission stuff out from backend code
3037          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3038          *
3039          * @param string $fromP Name of the user whose edits to rollback.
3040          * @param string $summary Custom summary. Set to default summary if empty.
3041          * @param string $token Rollback token.
3042          * @param bool $bot If true, mark all reverted edits as bot.
3043          *
3044          * @param array $resultDetails Array contains result-specific array of additional values
3045          *    'alreadyrolled' : 'current' (rev)
3046          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3047          *
3048          * @param User $user The user performing the rollback
3049          * @param array|null $tags Change tags to apply to the rollback
3050          * Callers are responsible for permission checks
3051          * (with ChangeTags::canAddTagsAccompanyingChange)
3052          *
3053          * @return array Array of errors, each error formatted as
3054          *   array(messagekey, param1, param2, ...).
3055          * On success, the array is empty.  This array can also be passed to
3056          * OutputPage::showPermissionsErrorPage().
3057          */
3058         public function doRollback(
3059                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3060         ) {
3061                 $resultDetails = null;
3062
3063                 // Check permissions
3064                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3065                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3066                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3067
3068                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3069                         $errors[] = [ 'sessionfailure' ];
3070                 }
3071
3072                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3073                         $errors[] = [ 'actionthrottledtext' ];
3074                 }
3075
3076                 // If there were errors, bail out now
3077                 if ( !empty( $errors ) ) {
3078                         return $errors;
3079                 }
3080
3081                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3082         }
3083
3084         /**
3085          * Backend implementation of doRollback(), please refer there for parameter
3086          * and return value documentation
3087          *
3088          * NOTE: This function does NOT check ANY permissions, it just commits the
3089          * rollback to the DB. Therefore, you should only call this function direct-
3090          * ly if you want to use custom permissions checks. If you don't, use
3091          * doRollback() instead.
3092          * @param string $fromP Name of the user whose edits to rollback.
3093          * @param string $summary Custom summary. Set to default summary if empty.
3094          * @param bool $bot If true, mark all reverted edits as bot.
3095          *
3096          * @param array $resultDetails Contains result-specific array of additional values
3097          * @param User $guser The user performing the rollback
3098          * @param array|null $tags Change tags to apply to the rollback
3099          * Callers are responsible for permission checks
3100          * (with ChangeTags::canAddTagsAccompanyingChange)
3101          *
3102          * @return array
3103          */
3104         public function commitRollback( $fromP, $summary, $bot,
3105                 &$resultDetails, User $guser, $tags = null
3106         ) {
3107                 global $wgUseRCPatrol, $wgContLang;
3108
3109                 $dbw = wfGetDB( DB_MASTER );
3110
3111                 if ( wfReadOnly() ) {
3112                         return [ [ 'readonlytext' ] ];
3113                 }
3114
3115                 // Get the last editor
3116                 $current = $this->getRevision();
3117                 if ( is_null( $current ) ) {
3118                         // Something wrong... no page?
3119                         return [ [ 'notanarticle' ] ];
3120                 }
3121
3122                 $from = str_replace( '_', ' ', $fromP );
3123                 // User name given should match up with the top revision.
3124                 // If the user was deleted then $from should be empty.
3125                 if ( $from != $current->getUserText() ) {
3126                         $resultDetails = [ 'current' => $current ];
3127                         return [ [ 'alreadyrolled',
3128                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3129                                 htmlspecialchars( $fromP ),
3130                                 htmlspecialchars( $current->getUserText() )
3131                         ] ];
3132                 }
3133
3134                 // Get the last edit not by this person...
3135                 // Note: these may not be public values
3136                 $user = intval( $current->getUser( Revision::RAW ) );
3137                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3138                 $s = $dbw->selectRow( 'revision',
3139                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3140                         [ 'rev_page' => $current->getPage(),
3141                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3142                         ], __METHOD__,
3143                         [ 'USE INDEX' => 'page_timestamp',
3144                                 'ORDER BY' => 'rev_timestamp DESC' ]
3145                         );
3146                 if ( $s === false ) {
3147                         // No one else ever edited this page
3148                         return [ [ 'cantrollback' ] ];
3149                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3150                         || $s->rev_deleted & Revision::DELETED_USER
3151                 ) {
3152                         // Only admins can see this text
3153                         return [ [ 'notvisiblerev' ] ];
3154                 }
3155
3156                 // Generate the edit summary if necessary
3157                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3158                 if ( empty( $summary ) ) {
3159                         if ( $from == '' ) { // no public user name
3160                                 $summary = wfMessage( 'revertpage-nouser' );
3161                         } else {
3162                                 $summary = wfMessage( 'revertpage' );
3163                         }
3164                 }
3165
3166                 // Allow the custom summary to use the same args as the default message
3167                 $args = [
3168                         $target->getUserText(), $from, $s->rev_id,
3169                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3170                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3171                 ];
3172                 if ( $summary instanceof Message ) {
3173                         $summary = $summary->params( $args )->inContentLanguage()->text();
3174                 } else {
3175                         $summary = wfMsgReplaceArgs( $summary, $args );
3176                 }
3177
3178                 // Trim spaces on user supplied text
3179                 $summary = trim( $summary );
3180
3181                 // Truncate for whole multibyte characters.
3182                 $summary = $wgContLang->truncate( $summary, 255 );
3183
3184                 // Save
3185                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3186
3187                 if ( $guser->isAllowed( 'minoredit' ) ) {
3188                         $flags |= EDIT_MINOR;
3189                 }
3190
3191                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3192                         $flags |= EDIT_FORCE_BOT;
3193                 }
3194
3195                 // Actually store the edit
3196                 $status = $this->doEditContent(
3197                         $target->getContent(),
3198                         $summary,
3199                         $flags,
3200                         $target->getId(),
3201                         $guser,
3202                         null,
3203                         $tags
3204                 );
3205
3206                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3207                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3208                 $set = [];
3209                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3210                         // Mark all reverted edits as bot
3211                         $set['rc_bot'] = 1;
3212                 }
3213
3214                 if ( $wgUseRCPatrol ) {
3215                         // Mark all reverted edits as patrolled
3216                         $set['rc_patrolled'] = 1;
3217                 }
3218
3219                 if ( count( $set ) ) {
3220                         $dbw->update( 'recentchanges', $set,
3221                                 [ /* WHERE */
3222                                         'rc_cur_id' => $current->getPage(),
3223                                         'rc_user_text' => $current->getUserText(),
3224                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3225                                 ],
3226                                 __METHOD__
3227                         );
3228                 }
3229
3230                 if ( !$status->isOK() ) {
3231                         return $status->getErrorsArray();
3232                 }
3233
3234                 // raise error, when the edit is an edit without a new version
3235                 $statusRev = isset( $status->value['revision'] )
3236                         ? $status->value['revision']
3237                         : null;
3238                 if ( !( $statusRev instanceof Revision ) ) {
3239                         $resultDetails = [ 'current' => $current ];
3240                         return [ [ 'alreadyrolled',
3241                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3242                                         htmlspecialchars( $fromP ),
3243                                         htmlspecialchars( $current->getUserText() )
3244                         ] ];
3245                 }
3246
3247                 $revId = $statusRev->getId();
3248
3249                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3250
3251                 $resultDetails = [
3252                         'summary' => $summary,
3253                         'current' => $current,
3254                         'target' => $target,
3255                         'newid' => $revId
3256                 ];
3257
3258                 return [];
3259         }
3260
3261         /**
3262          * The onArticle*() functions are supposed to be a kind of hooks
3263          * which should be called whenever any of the specified actions
3264          * are done.
3265          *
3266          * This is a good place to put code to clear caches, for instance.
3267          *
3268          * This is called on page move and undelete, as well as edit
3269          *
3270          * @param Title $title
3271          */
3272         public static function onArticleCreate( Title $title ) {
3273                 // Update existence markers on article/talk tabs...
3274                 $other = $title->getOtherPage();
3275
3276                 $other->purgeSquid();
3277
3278                 $title->touchLinks();
3279                 $title->purgeSquid();
3280                 $title->deleteTitleProtection();
3281
3282                 if ( $title->getNamespace() == NS_CATEGORY ) {
3283                         // Load the Category object, which will schedule a job to create
3284                         // the category table row if necessary. Checking a slave is ok
3285                         // here, in the worst case it'll run an unnecessary recount job on
3286                         // a category that probably doesn't have many members.
3287                         Category::newFromTitle( $title )->getID();
3288                 }
3289         }
3290
3291         /**
3292          * Clears caches when article is deleted
3293          *
3294          * @param Title $title
3295          */
3296         public static function onArticleDelete( Title $title ) {
3297                 global $wgContLang;
3298
3299                 // Update existence markers on article/talk tabs...
3300                 $other = $title->getOtherPage();
3301
3302                 $other->purgeSquid();
3303
3304                 $title->touchLinks();
3305                 $title->purgeSquid();
3306
3307                 // File cache
3308                 HTMLFileCache::clearFileCache( $title );
3309                 InfoAction::invalidateCache( $title );
3310
3311                 // Messages
3312                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3313                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3314
3315                         if ( $wgContLang->hasVariants() ) {
3316                                 $wgContLang->updateConversionTable( $title );
3317                         }
3318                 }
3319
3320                 // Images
3321                 if ( $title->getNamespace() == NS_FILE ) {
3322                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3323                 }
3324
3325                 // User talk pages
3326                 if ( $title->getNamespace() == NS_USER_TALK ) {
3327                         $user = User::newFromName( $title->getText(), false );
3328                         if ( $user ) {
3329                                 $user->setNewtalk( false );
3330                         }
3331                 }
3332
3333                 // Image redirects
3334                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3335         }
3336
3337         /**
3338          * Purge caches on page update etc
3339          *
3340          * @param Title $title
3341          * @param Revision|null $revision Revision that was just saved, may be null
3342          */
3343         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3344                 // Invalidate caches of articles which include this page
3345                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3346
3347                 // Invalidate the caches of all pages which redirect here
3348                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3349
3350                 // Purge CDN for this page only
3351                 $title->purgeSquid();
3352                 // Clear file cache for this page only
3353                 HTMLFileCache::clearFileCache( $title );
3354
3355                 $revid = $revision ? $revision->getId() : null;
3356                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3357                         InfoAction::invalidateCache( $title, $revid );
3358                 } );
3359         }
3360
3361         /**#@-*/
3362
3363         /**
3364          * Returns a list of categories this page is a member of.
3365          * Results will include hidden categories
3366          *
3367          * @return TitleArray
3368          */
3369         public function getCategories() {
3370                 $id = $this->getId();
3371                 if ( $id == 0 ) {
3372                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3373                 }
3374
3375                 $dbr = wfGetDB( DB_SLAVE );
3376                 $res = $dbr->select( 'categorylinks',
3377                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3378                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3379                         // as not being aliases, and NS_CATEGORY is numeric
3380                         [ 'cl_from' => $id ],
3381                         __METHOD__ );
3382
3383                 return TitleArray::newFromResult( $res );
3384         }
3385
3386         /**
3387          * Returns a list of hidden categories this page is a member of.
3388          * Uses the page_props and categorylinks tables.
3389          *
3390          * @return array Array of Title objects
3391          */
3392         public function getHiddenCategories() {
3393                 $result = [];
3394                 $id = $this->getId();
3395
3396                 if ( $id == 0 ) {
3397                         return [];
3398                 }
3399
3400                 $dbr = wfGetDB( DB_SLAVE );
3401                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3402                         [ 'cl_to' ],
3403                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3404                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3405                         __METHOD__ );
3406
3407                 if ( $res !== false ) {
3408                         foreach ( $res as $row ) {
3409                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3410                         }
3411                 }
3412
3413                 return $result;
3414         }
3415
3416         /**
3417          * Return an applicable autosummary if one exists for the given edit.
3418          * @param string|null $oldtext The previous text of the page.
3419          * @param string|null $newtext The submitted text of the page.
3420          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3421          * @return string An appropriate autosummary, or an empty string.
3422          *
3423          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3424          */
3425         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3426                 // NOTE: stub for backwards-compatibility. assumes the given text is
3427                 // wikitext. will break horribly if it isn't.
3428
3429                 ContentHandler::deprecated( __METHOD__, '1.21' );
3430
3431                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3432                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3433                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3434
3435                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3436         }
3437
3438         /**
3439          * Auto-generates a deletion reason
3440          *
3441          * @param bool &$hasHistory Whether the page has a history
3442          * @return string|bool String containing deletion reason or empty string, or boolean false
3443          *    if no revision occurred
3444          */
3445         public function getAutoDeleteReason( &$hasHistory ) {
3446                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3447         }
3448
3449         /**
3450          * Update all the appropriate counts in the category table, given that
3451          * we've added the categories $added and deleted the categories $deleted.
3452          *
3453          * @param array $added The names of categories that were added
3454          * @param array $deleted The names of categories that were deleted
3455          * @param integer $id Page ID (this should be the original deleted page ID)
3456          */
3457         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3458                 $id = $id ?: $this->getId();
3459                 $dbw = wfGetDB( DB_MASTER );
3460                 $method = __METHOD__;
3461                 // Do this at the end of the commit to reduce lock wait timeouts
3462                 $dbw->onTransactionPreCommitOrIdle(
3463                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3464                                 $ns = $this->getTitle()->getNamespace();
3465
3466                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3467                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3468                                 if ( $ns == NS_CATEGORY ) {
3469                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3470                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3471                                 } elseif ( $ns == NS_FILE ) {
3472                                         $addFields[] = 'cat_files = cat_files + 1';
3473                                         $removeFields[] = 'cat_files = cat_files - 1';
3474                                 }
3475
3476                                 if ( count( $added ) ) {
3477                                         $existingAdded = $dbw->selectFieldValues(
3478                                                 'category',
3479                                                 'cat_title',
3480                                                 [ 'cat_title' => $added ],
3481                                                 $method
3482                                         );
3483
3484                                         // For category rows that already exist, do a plain
3485                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3486                                         // to avoid creating gaps in the cat_id sequence.
3487                                         if ( count( $existingAdded ) ) {
3488                                                 $dbw->update(
3489                                                         'category',
3490                                                         $addFields,
3491                                                         [ 'cat_title' => $existingAdded ],
3492                                                         $method
3493                                                 );
3494                                         }
3495
3496                                         $missingAdded = array_diff( $added, $existingAdded );
3497                                         if ( count( $missingAdded ) ) {
3498                                                 $insertRows = [];
3499                                                 foreach ( $missingAdded as $cat ) {
3500                                                         $insertRows[] = [
3501                                                                 'cat_title'   => $cat,
3502                                                                 'cat_pages'   => 1,
3503                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3504                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3505                                                         ];
3506                                                 }
3507                                                 $dbw->upsert(
3508                                                         'category',
3509                                                         $insertRows,
3510                                                         [ 'cat_title' ],
3511                                                         $addFields,
3512                                                         $method
3513                                                 );
3514                                         }
3515                                 }
3516
3517                                 if ( count( $deleted ) ) {
3518                                         $dbw->update(
3519                                                 'category',
3520                                                 $removeFields,
3521                                                 [ 'cat_title' => $deleted ],
3522                                                 $method
3523                                         );
3524                                 }
3525
3526                                 foreach ( $added as $catName ) {
3527                                         $cat = Category::newFromName( $catName );
3528                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3529                                 }
3530
3531                                 foreach ( $deleted as $catName ) {
3532                                         $cat = Category::newFromName( $catName );
3533                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3534                                 }
3535
3536                                 // Refresh counts on categories that should be empty now, to
3537                                 // trigger possible deletion. Check master for the most
3538                                 // up-to-date cat_pages.
3539                                 if ( count( $deleted ) ) {
3540                                         $rows = $dbw->select(
3541                                                 'category',
3542                                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3543                                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3544                                                 $method
3545                                         );
3546                                         foreach ( $rows as $row ) {
3547                                                 $cat = Category::newFromRow( $row );
3548                                                 $cat->refreshCounts();
3549                                         }
3550                                 }
3551                         }
3552                 );
3553         }
3554
3555         /**
3556          * Opportunistically enqueue link update jobs given fresh parser output if useful
3557          *
3558          * @param ParserOutput $parserOutput Current version page output
3559          * @since 1.25
3560          */
3561         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3562                 if ( wfReadOnly() ) {
3563                         return;
3564                 }
3565
3566                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3567                         [ $this, $this->mTitle, $parserOutput ]
3568                 ) ) {
3569                         return;
3570                 }
3571
3572                 $config = RequestContext::getMain()->getConfig();
3573
3574                 $params = [
3575                         'isOpportunistic' => true,
3576                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3577                 ];
3578
3579                 if ( $this->mTitle->areRestrictionsCascading() ) {
3580                         // If the page is cascade protecting, the links should really be up-to-date
3581                         JobQueueGroup::singleton()->lazyPush(
3582                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3583                         );
3584                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3585                         // Assume the output contains "dynamic" time/random based magic words.
3586                         // Only update pages that expired due to dynamic content and NOT due to edits
3587                         // to referenced templates/files. When the cache expires due to dynamic content,
3588                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3589                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3590                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3591                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3592                                 // If a page is uncacheable, do not keep spamming a job for it.
3593                                 // Although it would be de-duplicated, it would still waste I/O.
3594                                 $cache = ObjectCache::getLocalClusterInstance();
3595                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3596                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3597                                 if ( $cache->add( $key, time(), $ttl ) ) {
3598                                         JobQueueGroup::singleton()->lazyPush(
3599                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3600                                         );
3601                                 }
3602                         }
3603                 }
3604         }
3605
3606         /**
3607          * Returns a list of updates to be performed when this page is deleted. The
3608          * updates should remove any information about this page from secondary data
3609          * stores such as links tables.
3610          *
3611          * @param Content|null $content Optional Content object for determining the
3612          *   necessary updates.
3613          * @return DataUpdate[]
3614          */
3615         public function getDeletionUpdates( Content $content = null ) {
3616                 if ( !$content ) {
3617                         // load content object, which may be used to determine the necessary updates.
3618                         // XXX: the content may not be needed to determine the updates.
3619                         $content = $this->getContent( Revision::RAW );
3620                 }
3621
3622                 if ( !$content ) {
3623                         $updates = [];
3624                 } else {
3625                         $updates = $content->getDeletionUpdates( $this );
3626                 }
3627
3628                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3629                 return $updates;
3630         }
3631 }