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          *
1049          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1050          */
1051         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1052
1053                 $useParserCache = $this->shouldCheckParserCache( $parserOptions, $oldid );
1054                 wfDebug( __METHOD__ .
1055                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1056                 if ( $parserOptions->getStubThreshold() ) {
1057                         wfIncrStats( 'pcache.miss.stub' );
1058                 }
1059
1060                 if ( $useParserCache ) {
1061                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1062                         if ( $parserOutput !== false ) {
1063                                 return $parserOutput;
1064                         }
1065                 }
1066
1067                 if ( $oldid === null || $oldid === 0 ) {
1068                         $oldid = $this->getLatest();
1069                 }
1070
1071                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1072                 $pool->execute();
1073
1074                 return $pool->getParserOutput();
1075         }
1076
1077         /**
1078          * Do standard deferred updates after page view (existing or missing page)
1079          * @param User $user The relevant user
1080          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1081          */
1082         public function doViewUpdates( User $user, $oldid = 0 ) {
1083                 if ( wfReadOnly() ) {
1084                         return;
1085                 }
1086
1087                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1088                 // Update newtalk / watchlist notification status
1089                 try {
1090                         $user->clearNotification( $this->mTitle, $oldid );
1091                 } catch ( DBError $e ) {
1092                         // Avoid outage if the master is not reachable
1093                         MWExceptionHandler::logException( $e );
1094                 }
1095         }
1096
1097         /**
1098          * Perform the actions of a page purging
1099          * @return bool
1100          */
1101         public function doPurge() {
1102                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1103                         return false;
1104                 }
1105
1106                 $title = $this->mTitle;
1107                 wfGetDB( DB_MASTER )->onTransactionIdle( function() use ( $title ) {
1108                         // Invalidate the cache in auto-commit mode
1109                         $title->invalidateCache();
1110                 } );
1111
1112                 // Send purge after above page_touched update was committed
1113                 DeferredUpdates::addUpdate(
1114                         new CdnCacheUpdate( $title->getCdnUrls() ),
1115                         DeferredUpdates::PRESEND
1116                 );
1117
1118                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1119                         // @todo move this logic to MessageCache
1120                         if ( $this->exists() ) {
1121                                 // NOTE: use transclusion text for messages.
1122                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1123
1124                                 $content = $this->getContent();
1125                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1126
1127                                 if ( $text === null ) {
1128                                         $text = false;
1129                                 }
1130                         } else {
1131                                 $text = false;
1132                         }
1133
1134                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1135                 }
1136
1137                 return true;
1138         }
1139
1140         /**
1141          * Insert a new empty page record for this article.
1142          * This *must* be followed up by creating a revision
1143          * and running $this->updateRevisionOn( ... );
1144          * or else the record will be left in a funky state.
1145          * Best if all done inside a transaction.
1146          *
1147          * @param IDatabase $dbw
1148          * @param int|null $pageId Custom page ID that will be used for the insert statement
1149          *
1150          * @return bool|int The newly created page_id key; false if the title already existed
1151          */
1152         public function insertOn( $dbw, $pageId = null ) {
1153                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1154                 $dbw->insert(
1155                         'page',
1156                         [
1157                                 'page_id'           => $pageIdForInsert,
1158                                 'page_namespace'    => $this->mTitle->getNamespace(),
1159                                 'page_title'        => $this->mTitle->getDBkey(),
1160                                 'page_restrictions' => '',
1161                                 'page_is_redirect'  => 0, // Will set this shortly...
1162                                 'page_is_new'       => 1,
1163                                 'page_random'       => wfRandom(),
1164                                 'page_touched'      => $dbw->timestamp(),
1165                                 'page_latest'       => 0, // Fill this in shortly...
1166                                 'page_len'          => 0, // Fill this in shortly...
1167                         ],
1168                         __METHOD__,
1169                         'IGNORE'
1170                 );
1171
1172                 if ( $dbw->affectedRows() > 0 ) {
1173                         $newid = $pageId ?: $dbw->insertId();
1174                         $this->mId = $newid;
1175                         $this->mTitle->resetArticleID( $newid );
1176
1177                         return $newid;
1178                 } else {
1179                         return false; // nothing changed
1180                 }
1181         }
1182
1183         /**
1184          * Update the page record to point to a newly saved revision.
1185          *
1186          * @param IDatabase $dbw
1187          * @param Revision $revision For ID number, and text used to set
1188          *   length and redirect status fields
1189          * @param int $lastRevision If given, will not overwrite the page field
1190          *   when different from the currently set value.
1191          *   Giving 0 indicates the new page flag should be set on.
1192          * @param bool $lastRevIsRedirect If given, will optimize adding and
1193          *   removing rows in redirect table.
1194          * @return bool Success; false if the page row was missing or page_latest changed
1195          */
1196         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1197                 $lastRevIsRedirect = null
1198         ) {
1199                 global $wgContentHandlerUseDB;
1200
1201                 // Assertion to try to catch T92046
1202                 if ( (int)$revision->getId() === 0 ) {
1203                         throw new InvalidArgumentException(
1204                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1205                         );
1206                 }
1207
1208                 $content = $revision->getContent();
1209                 $len = $content ? $content->getSize() : 0;
1210                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1211
1212                 $conditions = [ 'page_id' => $this->getId() ];
1213
1214                 if ( !is_null( $lastRevision ) ) {
1215                         // An extra check against threads stepping on each other
1216                         $conditions['page_latest'] = $lastRevision;
1217                 }
1218
1219                 $row = [ /* SET */
1220                         'page_latest'      => $revision->getId(),
1221                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1222                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1223                         'page_is_redirect' => $rt !== null ? 1 : 0,
1224                         'page_len'         => $len,
1225                 ];
1226
1227                 if ( $wgContentHandlerUseDB ) {
1228                         $row['page_content_model'] = $revision->getContentModel();
1229                 }
1230
1231                 $dbw->update( 'page',
1232                         $row,
1233                         $conditions,
1234                         __METHOD__ );
1235
1236                 $result = $dbw->affectedRows() > 0;
1237                 if ( $result ) {
1238                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1239                         $this->setLastEdit( $revision );
1240                         $this->mLatest = $revision->getId();
1241                         $this->mIsRedirect = (bool)$rt;
1242                         // Update the LinkCache.
1243                         LinkCache::singleton()->addGoodLinkObj(
1244                                 $this->getId(),
1245                                 $this->mTitle,
1246                                 $len,
1247                                 $this->mIsRedirect,
1248                                 $this->mLatest,
1249                                 $revision->getContentModel()
1250                         );
1251                 }
1252
1253                 return $result;
1254         }
1255
1256         /**
1257          * Add row to the redirect table if this is a redirect, remove otherwise.
1258          *
1259          * @param IDatabase $dbw
1260          * @param Title $redirectTitle Title object pointing to the redirect target,
1261          *   or NULL if this is not a redirect
1262          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1263          *   removing rows in redirect table.
1264          * @return bool True on success, false on failure
1265          * @private
1266          */
1267         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1268                 // Always update redirects (target link might have changed)
1269                 // Update/Insert if we don't know if the last revision was a redirect or not
1270                 // Delete if changing from redirect to non-redirect
1271                 $isRedirect = !is_null( $redirectTitle );
1272
1273                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1274                         return true;
1275                 }
1276
1277                 if ( $isRedirect ) {
1278                         $this->insertRedirectEntry( $redirectTitle );
1279                 } else {
1280                         // This is not a redirect, remove row from redirect table
1281                         $where = [ 'rd_from' => $this->getId() ];
1282                         $dbw->delete( 'redirect', $where, __METHOD__ );
1283                 }
1284
1285                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1286                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1287                 }
1288
1289                 return ( $dbw->affectedRows() != 0 );
1290         }
1291
1292         /**
1293          * If the given revision is newer than the currently set page_latest,
1294          * update the page record. Otherwise, do nothing.
1295          *
1296          * @deprecated since 1.24, use updateRevisionOn instead
1297          *
1298          * @param IDatabase $dbw
1299          * @param Revision $revision
1300          * @return bool
1301          */
1302         public function updateIfNewerOn( $dbw, $revision ) {
1303
1304                 $row = $dbw->selectRow(
1305                         [ 'revision', 'page' ],
1306                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1307                         [
1308                                 'page_id' => $this->getId(),
1309                                 'page_latest=rev_id' ],
1310                         __METHOD__ );
1311
1312                 if ( $row ) {
1313                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1314                                 return false;
1315                         }
1316                         $prev = $row->rev_id;
1317                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1318                 } else {
1319                         // No or missing previous revision; mark the page as new
1320                         $prev = 0;
1321                         $lastRevIsRedirect = null;
1322                 }
1323
1324                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1325
1326                 return $ret;
1327         }
1328
1329         /**
1330          * Get the content that needs to be saved in order to undo all revisions
1331          * between $undo and $undoafter. Revisions must belong to the same page,
1332          * must exist and must not be deleted
1333          * @param Revision $undo
1334          * @param Revision $undoafter Must be an earlier revision than $undo
1335          * @return Content|bool Content on success, false on failure
1336          * @since 1.21
1337          * Before we had the Content object, this was done in getUndoText
1338          */
1339         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1340                 $handler = $undo->getContentHandler();
1341                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1342         }
1343
1344         /**
1345          * Returns true if this page's content model supports sections.
1346          *
1347          * @return bool
1348          *
1349          * @todo The skin should check this and not offer section functionality if
1350          *   sections are not supported.
1351          * @todo The EditPage should check this and not offer section functionality
1352          *   if sections are not supported.
1353          */
1354         public function supportsSections() {
1355                 return $this->getContentHandler()->supportsSections();
1356         }
1357
1358         /**
1359          * @param string|number|null|bool $sectionId Section identifier as a number or string
1360          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1361          * or 'new' for a new section.
1362          * @param Content $sectionContent New content of the section.
1363          * @param string $sectionTitle New section's subject, only if $section is "new".
1364          * @param string $edittime Revision timestamp or null to use the current revision.
1365          *
1366          * @throws MWException
1367          * @return Content|null New complete article content, or null if error.
1368          *
1369          * @since 1.21
1370          * @deprecated since 1.24, use replaceSectionAtRev instead
1371          */
1372         public function replaceSectionContent(
1373                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1374         ) {
1375
1376                 $baseRevId = null;
1377                 if ( $edittime && $sectionId !== 'new' ) {
1378                         $dbr = wfGetDB( DB_SLAVE );
1379                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1380                         // Try the master if this thread may have just added it.
1381                         // This could be abstracted into a Revision method, but we don't want
1382                         // to encourage loading of revisions by timestamp.
1383                         if ( !$rev
1384                                 && wfGetLB()->getServerCount() > 1
1385                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1386                         ) {
1387                                 $dbw = wfGetDB( DB_MASTER );
1388                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1389                         }
1390                         if ( $rev ) {
1391                                 $baseRevId = $rev->getId();
1392                         }
1393                 }
1394
1395                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1396         }
1397
1398         /**
1399          * @param string|number|null|bool $sectionId Section identifier as a number or string
1400          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1401          * or 'new' for a new section.
1402          * @param Content $sectionContent New content of the section.
1403          * @param string $sectionTitle New section's subject, only if $section is "new".
1404          * @param int|null $baseRevId
1405          *
1406          * @throws MWException
1407          * @return Content|null New complete article content, or null if error.
1408          *
1409          * @since 1.24
1410          */
1411         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1412                 $sectionTitle = '', $baseRevId = null
1413         ) {
1414
1415                 if ( strval( $sectionId ) === '' ) {
1416                         // Whole-page edit; let the whole text through
1417                         $newContent = $sectionContent;
1418                 } else {
1419                         if ( !$this->supportsSections() ) {
1420                                 throw new MWException( "sections not supported for content model " .
1421                                         $this->getContentHandler()->getModelID() );
1422                         }
1423
1424                         // Bug 30711: always use current version when adding a new section
1425                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1426                                 $oldContent = $this->getContent();
1427                         } else {
1428                                 $rev = Revision::newFromId( $baseRevId );
1429                                 if ( !$rev ) {
1430                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1431                                                 $this->getId() . "; section: $sectionId)\n" );
1432                                         return null;
1433                                 }
1434
1435                                 $oldContent = $rev->getContent();
1436                         }
1437
1438                         if ( !$oldContent ) {
1439                                 wfDebug( __METHOD__ . ": no page text\n" );
1440                                 return null;
1441                         }
1442
1443                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1444                 }
1445
1446                 return $newContent;
1447         }
1448
1449         /**
1450          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1451          * @param int $flags
1452          * @return int Updated $flags
1453          */
1454         public function checkFlags( $flags ) {
1455                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1456                         if ( $this->exists() ) {
1457                                 $flags |= EDIT_UPDATE;
1458                         } else {
1459                                 $flags |= EDIT_NEW;
1460                         }
1461                 }
1462
1463                 return $flags;
1464         }
1465
1466         /**
1467          * Change an existing article or create a new article. Updates RC and all necessary caches,
1468          * optionally via the deferred update array.
1469          *
1470          * @param string $text New text
1471          * @param string $summary Edit summary
1472          * @param int $flags Bitfield:
1473          *      EDIT_NEW
1474          *          Article is known or assumed to be non-existent, create a new one
1475          *      EDIT_UPDATE
1476          *          Article is known or assumed to be pre-existing, update it
1477          *      EDIT_MINOR
1478          *          Mark this edit minor, if the user is allowed to do so
1479          *      EDIT_SUPPRESS_RC
1480          *          Do not log the change in recentchanges
1481          *      EDIT_FORCE_BOT
1482          *          Mark the edit a "bot" edit regardless of user rights
1483          *      EDIT_AUTOSUMMARY
1484          *          Fill in blank summaries with generated text where possible
1485          *      EDIT_INTERNAL
1486          *          Signal that the page retrieve/save cycle happened entirely in this request.
1487          *
1488          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1489          * article will be detected. If EDIT_UPDATE is specified and the article
1490          * doesn't exist, the function will return an edit-gone-missing error. If
1491          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1492          * error will be returned. These two conditions are also possible with
1493          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1494          *
1495          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1496          *   This is not the parent revision ID, rather the revision ID for older
1497          *   content used as the source for a rollback, for example.
1498          * @param User $user The user doing the edit
1499          *
1500          * @throws MWException
1501          * @return Status Possible errors:
1502          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1503          *     set the fatal flag of $status
1504          *   edit-gone-missing: In update mode, but the article didn't exist.
1505          *   edit-conflict: In update mode, the article changed unexpectedly.
1506          *   edit-no-change: Warning that the text was the same as before.
1507          *   edit-already-exists: In creation mode, but the article already exists.
1508          *
1509          * Extensions may define additional errors.
1510          *
1511          * $return->value will contain an associative array with members as follows:
1512          *     new: Boolean indicating if the function attempted to create a new article.
1513          *     revision: The revision object for the inserted revision, or null.
1514          *
1515          * Compatibility note: this function previously returned a boolean value
1516          * indicating success/failure
1517          *
1518          * @deprecated since 1.21: use doEditContent() instead.
1519          */
1520         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1521                 ContentHandler::deprecated( __METHOD__, '1.21' );
1522
1523                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1524
1525                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1526         }
1527
1528         /**
1529          * Change an existing article or create a new article. Updates RC and all necessary caches,
1530          * optionally via the deferred update array.
1531          *
1532          * @param Content $content New content
1533          * @param string $summary Edit summary
1534          * @param int $flags Bitfield:
1535          *      EDIT_NEW
1536          *          Article is known or assumed to be non-existent, create a new one
1537          *      EDIT_UPDATE
1538          *          Article is known or assumed to be pre-existing, update it
1539          *      EDIT_MINOR
1540          *          Mark this edit minor, if the user is allowed to do so
1541          *      EDIT_SUPPRESS_RC
1542          *          Do not log the change in recentchanges
1543          *      EDIT_FORCE_BOT
1544          *          Mark the edit a "bot" edit regardless of user rights
1545          *      EDIT_AUTOSUMMARY
1546          *          Fill in blank summaries with generated text where possible
1547          *      EDIT_INTERNAL
1548          *          Signal that the page retrieve/save cycle happened entirely in this request.
1549          *
1550          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1551          * article will be detected. If EDIT_UPDATE is specified and the article
1552          * doesn't exist, the function will return an edit-gone-missing error. If
1553          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1554          * error will be returned. These two conditions are also possible with
1555          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1556          *
1557          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1558          *   This is not the parent revision ID, rather the revision ID for older
1559          *   content used as the source for a rollback, for example.
1560          * @param User $user The user doing the edit
1561          * @param string $serialFormat Format for storing the content in the
1562          *   database.
1563          * @param array|null $tags Change tags to apply to this edit
1564          * Callers are responsible for permission checks
1565          * (with ChangeTags::canAddTagsAccompanyingChange)
1566          *
1567          * @throws MWException
1568          * @return Status Possible errors:
1569          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1570          *       set the fatal flag of $status.
1571          *     edit-gone-missing: In update mode, but the article didn't exist.
1572          *     edit-conflict: In update mode, the article changed unexpectedly.
1573          *     edit-no-change: Warning that the text was the same as before.
1574          *     edit-already-exists: In creation mode, but the article already exists.
1575          *
1576          *  Extensions may define additional errors.
1577          *
1578          *  $return->value will contain an associative array with members as follows:
1579          *     new: Boolean indicating if the function attempted to create a new article.
1580          *     revision: The revision object for the inserted revision, or null.
1581          *
1582          * @since 1.21
1583          * @throws MWException
1584          */
1585         public function doEditContent(
1586                 Content $content, $summary, $flags = 0, $baseRevId = false,
1587                 User $user = null, $serialFormat = null, $tags = null
1588         ) {
1589                 global $wgUser, $wgUseAutomaticEditSummaries;
1590
1591                 // Low-level sanity check
1592                 if ( $this->mTitle->getText() === '' ) {
1593                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1594                 }
1595                 // Make sure the given content type is allowed for this page
1596                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1597                         return Status::newFatal( 'content-not-allowed-here',
1598                                 ContentHandler::getLocalizedName( $content->getModel() ),
1599                                 $this->mTitle->getPrefixedText()
1600                         );
1601                 }
1602
1603                 // Load the data from the master database if needed.
1604                 // The caller may already loaded it from the master or even loaded it using
1605                 // SELECT FOR UPDATE, so do not override that using clear().
1606                 $this->loadPageData( 'fromdbmaster' );
1607
1608                 $user = $user ?: $wgUser;
1609                 $flags = $this->checkFlags( $flags );
1610
1611                 // Trigger pre-save hook (using provided edit summary)
1612                 $hookStatus = Status::newGood( [] );
1613                 $hook_args = [ &$this, &$user, &$content, &$summary,
1614                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1615                 // Check if the hook rejected the attempted save
1616                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1617                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1618                 ) {
1619                         if ( $hookStatus->isOK() ) {
1620                                 // Hook returned false but didn't call fatal(); use generic message
1621                                 $hookStatus->fatal( 'edit-hook-aborted' );
1622                         }
1623
1624                         return $hookStatus;
1625                 }
1626
1627                 $old_revision = $this->getRevision(); // current revision
1628                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1629
1630                 // Provide autosummaries if one is not provided and autosummaries are enabled
1631                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1632                         $handler = $content->getContentHandler();
1633                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1634                 }
1635
1636                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1637                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1638                         $useCache = false;
1639                 } else {
1640                         $useCache = true;
1641                 }
1642
1643                 // Get the pre-save transform content and final parser output
1644                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1645                 $pstContent = $editInfo->pstContent; // Content object
1646                 $meta = [
1647                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1648                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1649                         'serialized' => $editInfo->pst,
1650                         'serialFormat' => $serialFormat,
1651                         'baseRevId' => $baseRevId,
1652                         'oldRevision' => $old_revision,
1653                         'oldContent' => $old_content,
1654                         'oldId' => $this->getLatest(),
1655                         'oldIsRedirect' => $this->isRedirect(),
1656                         'oldCountable' => $this->isCountable(),
1657                         'tags' => ( $tags !== null ) ? (array)$tags : []
1658                 ];
1659
1660                 // Actually create the revision and create/update the page
1661                 if ( $flags & EDIT_UPDATE ) {
1662                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1663                 } else {
1664                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1665                 }
1666
1667                 // Promote user to any groups they meet the criteria for
1668                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1669                         $user->addAutopromoteOnceGroups( 'onEdit' );
1670                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1671                 } );
1672
1673                 return $status;
1674         }
1675
1676         /**
1677          * @param Content $content Pre-save transform content
1678          * @param integer $flags
1679          * @param User $user
1680          * @param string $summary
1681          * @param array $meta
1682          * @return Status
1683          * @throws DBUnexpectedError
1684          * @throws Exception
1685          * @throws FatalError
1686          * @throws MWException
1687          */
1688         private function doModify(
1689                 Content $content, $flags, User $user, $summary, array $meta
1690         ) {
1691                 global $wgUseRCPatrol;
1692
1693                 // Update article, but only if changed.
1694                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1695
1696                 // Convenience variables
1697                 $now = wfTimestampNow();
1698                 $oldid = $meta['oldId'];
1699                 /** @var $oldContent Content|null */
1700                 $oldContent = $meta['oldContent'];
1701                 $newsize = $content->getSize();
1702
1703                 if ( !$oldid ) {
1704                         // Article gone missing
1705                         $status->fatal( 'edit-gone-missing' );
1706
1707                         return $status;
1708                 } elseif ( !$oldContent ) {
1709                         // Sanity check for bug 37225
1710                         throw new MWException( "Could not find text for current revision {$oldid}." );
1711                 }
1712
1713                 // @TODO: pass content object?!
1714                 $revision = new Revision( [
1715                         'page'       => $this->getId(),
1716                         'title'      => $this->mTitle, // for determining the default content model
1717                         'comment'    => $summary,
1718                         'minor_edit' => $meta['minor'],
1719                         'text'       => $meta['serialized'],
1720                         'len'        => $newsize,
1721                         'parent_id'  => $oldid,
1722                         'user'       => $user->getId(),
1723                         'user_text'  => $user->getName(),
1724                         'timestamp'  => $now,
1725                         'content_model' => $content->getModel(),
1726                         'content_format' => $meta['serialFormat'],
1727                 ] );
1728
1729                 $changed = !$content->equals( $oldContent );
1730
1731                 $dbw = wfGetDB( DB_MASTER );
1732
1733                 if ( $changed ) {
1734                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1735                         $status->merge( $prepStatus );
1736                         if ( !$status->isOK() ) {
1737                                 return $status;
1738                         }
1739
1740                         $dbw->startAtomic( __METHOD__ );
1741                         // Get the latest page_latest value while locking it.
1742                         // Do a CAS style check to see if it's the same as when this method
1743                         // started. If it changed then bail out before touching the DB.
1744                         $latestNow = $this->lockAndGetLatest();
1745                         if ( $latestNow != $oldid ) {
1746                                 $dbw->endAtomic( __METHOD__ );
1747                                 // Page updated or deleted in the mean time
1748                                 $status->fatal( 'edit-conflict' );
1749
1750                                 return $status;
1751                         }
1752
1753                         // At this point we are now comitted to returning an OK
1754                         // status unless some DB query error or other exception comes up.
1755                         // This way callers don't have to call rollback() if $status is bad
1756                         // unless they actually try to catch exceptions (which is rare).
1757
1758                         // Save the revision text
1759                         $revisionId = $revision->insertOn( $dbw );
1760                         // Update page_latest and friends to reflect the new revision
1761                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1762                                 $dbw->rollback( __METHOD__ ); // sanity; this should never happen
1763                                 throw new MWException( "Failed to update page row to use new revision." );
1764                         }
1765
1766                         Hooks::run( 'NewRevisionFromEditComplete',
1767                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1768
1769                         // Update recentchanges
1770                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1771                                 // Mark as patrolled if the user can do so
1772                                 $patrolled = $wgUseRCPatrol && !count(
1773                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1774                                 // Add RC row to the DB
1775                                 RecentChange::notifyEdit(
1776                                         $now,
1777                                         $this->mTitle,
1778                                         $revision->isMinor(),
1779                                         $user,
1780                                         $summary,
1781                                         $oldid,
1782                                         $this->getTimestamp(),
1783                                         $meta['bot'],
1784                                         '',
1785                                         $oldContent ? $oldContent->getSize() : 0,
1786                                         $newsize,
1787                                         $revisionId,
1788                                         $patrolled,
1789                                         $meta['tags']
1790                                 );
1791                         }
1792
1793                         $user->incEditCount();
1794
1795                         $dbw->endAtomic( __METHOD__ );
1796                         $this->mTimestamp = $now;
1797                 } else {
1798                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1799                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1800                         $revision->setId( $this->getLatest() );
1801                         $revision->setUserIdAndName(
1802                                 $this->getUser( Revision::RAW ),
1803                                 $this->getUserText( Revision::RAW )
1804                         );
1805                 }
1806
1807                 if ( $changed ) {
1808                         // Return the new revision to the caller
1809                         $status->value['revision'] = $revision;
1810                 } else {
1811                         $status->warning( 'edit-no-change' );
1812                         // Update page_touched as updateRevisionOn() was not called.
1813                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1814                         $this->mTitle->invalidateCache( $now );
1815                 }
1816
1817                 // Do secondary updates once the main changes have been committed...
1818                 $that = $this;
1819                 $dbw->onTransactionIdle(
1820                         function () use (
1821                                 $dbw, &$that, $revision, &$user, $content, $summary, &$flags,
1822                                 $changed, $meta, &$status
1823                         ) {
1824                                 // Do per-page updates in a transaction
1825                                 $dbw->setFlag( DBO_TRX );
1826                                 // Update links tables, site stats, etc.
1827                                 $that->doEditUpdates(
1828                                         $revision,
1829                                         $user,
1830                                         [
1831                                                 'changed' => $changed,
1832                                                 'oldcountable' => $meta['oldCountable'],
1833                                                 'oldrevision' => $meta['oldRevision']
1834                                         ]
1835                                 );
1836                                 // Trigger post-save hook
1837                                 $params = [ &$that, &$user, $content, $summary, $flags & EDIT_MINOR,
1838                                         null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1839                                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1840                                 Hooks::run( 'PageContentSaveComplete', $params );
1841                         }
1842                 );
1843
1844                 return $status;
1845         }
1846
1847         /**
1848          * @param Content $content Pre-save transform content
1849          * @param integer $flags
1850          * @param User $user
1851          * @param string $summary
1852          * @param array $meta
1853          * @return Status
1854          * @throws DBUnexpectedError
1855          * @throws Exception
1856          * @throws FatalError
1857          * @throws MWException
1858          */
1859         private function doCreate(
1860                 Content $content, $flags, User $user, $summary, array $meta
1861         ) {
1862                 global $wgUseRCPatrol, $wgUseNPPatrol;
1863
1864                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1865
1866                 $now = wfTimestampNow();
1867                 $newsize = $content->getSize();
1868                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1869                 $status->merge( $prepStatus );
1870                 if ( !$status->isOK() ) {
1871                         return $status;
1872                 }
1873
1874                 $dbw = wfGetDB( DB_MASTER );
1875                 $dbw->startAtomic( __METHOD__ );
1876
1877                 // Add the page record unless one already exists for the title
1878                 $newid = $this->insertOn( $dbw );
1879                 if ( $newid === false ) {
1880                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1881                         $status->fatal( 'edit-already-exists' );
1882
1883                         return $status; // nothing done
1884                 }
1885
1886                 // At this point we are now comitted to returning an OK
1887                 // status unless some DB query error or other exception comes up.
1888                 // This way callers don't have to call rollback() if $status is bad
1889                 // unless they actually try to catch exceptions (which is rare).
1890
1891                 // @TODO: pass content object?!
1892                 $revision = new Revision( [
1893                         'page'       => $newid,
1894                         'title'      => $this->mTitle, // for determining the default content model
1895                         'comment'    => $summary,
1896                         'minor_edit' => $meta['minor'],
1897                         'text'       => $meta['serialized'],
1898                         'len'        => $newsize,
1899                         'user'       => $user->getId(),
1900                         'user_text'  => $user->getName(),
1901                         'timestamp'  => $now,
1902                         'content_model' => $content->getModel(),
1903                         'content_format' => $meta['serialFormat'],
1904                 ] );
1905
1906                 // Save the revision text...
1907                 $revisionId = $revision->insertOn( $dbw );
1908                 // Update the page record with revision data
1909                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1910                         $dbw->rollback( __METHOD__ ); // sanity; this should never happen
1911                         throw new MWException( "Failed to update page row to use new revision." );
1912                 }
1913
1914                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1915
1916                 // Update recentchanges
1917                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1918                         // Mark as patrolled if the user can do so
1919                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1920                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1921                         // Add RC row to the DB
1922                         RecentChange::notifyNew(
1923                                 $now,
1924                                 $this->mTitle,
1925                                 $revision->isMinor(),
1926                                 $user,
1927                                 $summary,
1928                                 $meta['bot'],
1929                                 '',
1930                                 $newsize,
1931                                 $revisionId,
1932                                 $patrolled,
1933                                 $meta['tags']
1934                         );
1935                 }
1936
1937                 $user->incEditCount();
1938
1939                 $dbw->endAtomic( __METHOD__ );
1940                 $this->mTimestamp = $now;
1941
1942                 // Return the new revision to the caller
1943                 $status->value['revision'] = $revision;
1944
1945                 // Do secondary updates once the main changes have been committed...
1946                 $that = $this;
1947                 $dbw->onTransactionIdle(
1948                         function () use (
1949                                 &$that, $dbw, $revision, &$user, $content, $summary, &$flags, $meta, &$status
1950                         ) {
1951                                 // Do per-page updates in a transaction
1952                                 $dbw->setFlag( DBO_TRX );
1953                                 // Update links, etc.
1954                                 $that->doEditUpdates( $revision, $user, [ 'created' => true ] );
1955                                 // Trigger post-create hook
1956                                 $params = [ &$that, &$user, $content, $summary,
1957                                         $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1958                                 ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
1959                                 Hooks::run( 'PageContentInsertComplete', $params );
1960                                 // Trigger post-save hook
1961                                 $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
1962                                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1963                                 Hooks::run( 'PageContentSaveComplete', $params );
1964
1965                         }
1966                 );
1967
1968                 return $status;
1969         }
1970
1971         /**
1972          * Get parser options suitable for rendering the primary article wikitext
1973          *
1974          * @see ContentHandler::makeParserOptions
1975          *
1976          * @param IContextSource|User|string $context One of the following:
1977          *        - IContextSource: Use the User and the Language of the provided
1978          *          context
1979          *        - User: Use the provided User object and $wgLang for the language,
1980          *          so use an IContextSource object if possible.
1981          *        - 'canonical': Canonical options (anonymous user with default
1982          *          preferences and content language).
1983          * @return ParserOptions
1984          */
1985         public function makeParserOptions( $context ) {
1986                 $options = $this->getContentHandler()->makeParserOptions( $context );
1987
1988                 if ( $this->getTitle()->isConversionTable() ) {
1989                         // @todo ConversionTable should become a separate content model, so
1990                         // we don't need special cases like this one.
1991                         $options->disableContentConversion();
1992                 }
1993
1994                 return $options;
1995         }
1996
1997         /**
1998          * Prepare text which is about to be saved.
1999          * Returns a stdClass with source, pst and output members
2000          *
2001          * @param string $text
2002          * @param int|null $revid
2003          * @param User|null $user
2004          * @deprecated since 1.21: use prepareContentForEdit instead.
2005          * @return object
2006          */
2007         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2008                 ContentHandler::deprecated( __METHOD__, '1.21' );
2009                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2010                 return $this->prepareContentForEdit( $content, $revid, $user );
2011         }
2012
2013         /**
2014          * Prepare content which is about to be saved.
2015          * Returns a stdClass with source, pst and output members
2016          *
2017          * @param Content $content
2018          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2019          *        revision ID is also accepted, but this is deprecated.
2020          * @param User|null $user
2021          * @param string|null $serialFormat
2022          * @param bool $useCache Check shared prepared edit cache
2023          *
2024          * @return object
2025          *
2026          * @since 1.21
2027          */
2028         public function prepareContentForEdit(
2029                 Content $content, $revision = null, User $user = null,
2030                 $serialFormat = null, $useCache = true
2031         ) {
2032                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2033
2034                 if ( is_object( $revision ) ) {
2035                         $revid = $revision->getId();
2036                 } else {
2037                         $revid = $revision;
2038                         // This code path is deprecated, and nothing is known to
2039                         // use it, so performance here shouldn't be a worry.
2040                         if ( $revid !== null ) {
2041                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2042                         } else {
2043                                 $revision = null;
2044                         }
2045                 }
2046
2047                 $user = is_null( $user ) ? $wgUser : $user;
2048                 // XXX: check $user->getId() here???
2049
2050                 // Use a sane default for $serialFormat, see bug 57026
2051                 if ( $serialFormat === null ) {
2052                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2053                 }
2054
2055                 if ( $this->mPreparedEdit
2056                         && $this->mPreparedEdit->newContent
2057                         && $this->mPreparedEdit->newContent->equals( $content )
2058                         && $this->mPreparedEdit->revid == $revid
2059                         && $this->mPreparedEdit->format == $serialFormat
2060                         // XXX: also check $user here?
2061                 ) {
2062                         // Already prepared
2063                         return $this->mPreparedEdit;
2064                 }
2065
2066                 // The edit may have already been prepared via api.php?action=stashedit
2067                 $cachedEdit = $useCache && $wgAjaxEditStash
2068                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2069                         : false;
2070
2071                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2072                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2073
2074                 $edit = (object)[];
2075                 if ( $cachedEdit ) {
2076                         $edit->timestamp = $cachedEdit->timestamp;
2077                 } else {
2078                         $edit->timestamp = wfTimestampNow();
2079                 }
2080                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2081                 $edit->revid = $revid;
2082
2083                 if ( $cachedEdit ) {
2084                         $edit->pstContent = $cachedEdit->pstContent;
2085                 } else {
2086                         $edit->pstContent = $content
2087                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2088                                 : null;
2089                 }
2090
2091                 $edit->format = $serialFormat;
2092                 $edit->popts = $this->makeParserOptions( 'canonical' );
2093                 if ( $cachedEdit ) {
2094                         $edit->output = $cachedEdit->output;
2095                 } else {
2096                         if ( $revision ) {
2097                                 // We get here if vary-revision is set. This means that this page references
2098                                 // itself (such as via self-transclusion). In this case, we need to make sure
2099                                 // that any such self-references refer to the newly-saved revision, and not
2100                                 // to the previous one, which could otherwise happen due to slave lag.
2101                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2102                                 $edit->popts->setCurrentRevisionCallback(
2103                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2104                                                 if ( $title->equals( $revision->getTitle() ) ) {
2105                                                         return $revision;
2106                                                 } else {
2107                                                         return call_user_func( $oldCallback, $title, $parser );
2108                                                 }
2109                                         }
2110                                 );
2111                         } else {
2112                                 // Try to avoid a second parse if {{REVISIONID}} is used
2113                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2114                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2115                                                 'revision',
2116                                                 'MAX(rev_id)',
2117                                                 [],
2118                                                 __METHOD__
2119                                         );
2120                                 } );
2121                         }
2122                         $edit->output = $edit->pstContent
2123                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2124                                 : null;
2125                 }
2126
2127                 $edit->newContent = $content;
2128                 $edit->oldContent = $this->getContent( Revision::RAW );
2129
2130                 // NOTE: B/C for hooks! don't use these fields!
2131                 $edit->newText = $edit->newContent
2132                         ? ContentHandler::getContentText( $edit->newContent )
2133                         : '';
2134                 $edit->oldText = $edit->oldContent
2135                         ? ContentHandler::getContentText( $edit->oldContent )
2136                         : '';
2137                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2138
2139                 if ( $edit->output ) {
2140                         $edit->output->setCacheTime( wfTimestampNow() );
2141                 }
2142
2143                 // Process cache the result
2144                 $this->mPreparedEdit = $edit;
2145
2146                 return $edit;
2147         }
2148
2149         /**
2150          * Do standard deferred updates after page edit.
2151          * Update links tables, site stats, search index and message cache.
2152          * Purges pages that include this page if the text was changed here.
2153          * Every 100th edit, prune the recent changes table.
2154          *
2155          * @param Revision $revision
2156          * @param User $user User object that did the revision
2157          * @param array $options Array of options, following indexes are used:
2158          * - changed: boolean, whether the revision changed the content (default true)
2159          * - created: boolean, whether the revision created the page (default false)
2160          * - moved: boolean, whether the page was moved (default false)
2161          * - restored: boolean, whether the page was undeleted (default false)
2162          * - oldrevision: Revision object for the pre-update revision (default null)
2163          * - oldcountable: boolean, null, or string 'no-change' (default null):
2164          *   - boolean: whether the page was counted as an article before that
2165          *     revision, only used in changed is true and created is false
2166          *   - null: if created is false, don't update the article count; if created
2167          *     is true, do update the article count
2168          *   - 'no-change': don't update the article count, ever
2169          */
2170         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2171                 global $wgRCWatchCategoryMembership, $wgContLang;
2172
2173                 $options += [
2174                         'changed' => true,
2175                         'created' => false,
2176                         'moved' => false,
2177                         'restored' => false,
2178                         'oldrevision' => null,
2179                         'oldcountable' => null
2180                 ];
2181                 $content = $revision->getContent();
2182
2183                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2184
2185                 // See if the parser output before $revision was inserted is still valid
2186                 $editInfo = false;
2187                 if ( !$this->mPreparedEdit ) {
2188                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2189                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2190                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2191                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2192                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2193                 ) {
2194                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2195                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2196                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2197                 } else {
2198                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2199                         $editInfo = $this->mPreparedEdit;
2200                 }
2201
2202                 if ( !$editInfo ) {
2203                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2204                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2205                         // as any prepared content from there or in doEditContent() was already rejected.
2206                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2207                 }
2208
2209                 // Save it to the parser cache.
2210                 // Make sure the cache time matches page_touched to avoid double parsing.
2211                 ParserCache::singleton()->save(
2212                         $editInfo->output, $this, $editInfo->popts,
2213                         $revision->getTimestamp(), $editInfo->revid
2214                 );
2215
2216                 // Update the links tables and other secondary data
2217                 if ( $content ) {
2218                         $recursive = $options['changed']; // bug 50785
2219                         $updates = $content->getSecondaryDataUpdates(
2220                                 $this->getTitle(), null, $recursive, $editInfo->output
2221                         );
2222                         foreach ( $updates as $update ) {
2223                                 if ( $update instanceof LinksUpdate ) {
2224                                         $update->setRevision( $revision );
2225                                         $update->setTriggeringUser( $user );
2226                                 }
2227                                 DeferredUpdates::addUpdate( $update );
2228                         }
2229                         if ( $wgRCWatchCategoryMembership
2230                                 && $this->getContentHandler()->supportsCategories() === true
2231                                 && ( $options['changed'] || $options['created'] )
2232                                 && !$options['restored']
2233                         ) {
2234                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2235                                 // the recent change entry (also done via deferred updates) and carry over any
2236                                 // bot/deletion/IP flags, ect.
2237                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2238                                         $this->getTitle(),
2239                                         [
2240                                                 'pageId' => $this->getId(),
2241                                                 'revTimestamp' => $revision->getTimestamp()
2242                                         ]
2243                                 ) );
2244                         }
2245                 }
2246
2247                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2248
2249                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2250                         // Flush old entries from the `recentchanges` table
2251                         if ( mt_rand( 0, 9 ) == 0 ) {
2252                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2253                         }
2254                 }
2255
2256                 if ( !$this->exists() ) {
2257                         return;
2258                 }
2259
2260                 $id = $this->getId();
2261                 $title = $this->mTitle->getPrefixedDBkey();
2262                 $shortTitle = $this->mTitle->getDBkey();
2263
2264                 if ( $options['oldcountable'] === 'no-change' ||
2265                         ( !$options['changed'] && !$options['moved'] )
2266                 ) {
2267                         $good = 0;
2268                 } elseif ( $options['created'] ) {
2269                         $good = (int)$this->isCountable( $editInfo );
2270                 } elseif ( $options['oldcountable'] !== null ) {
2271                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2272                 } else {
2273                         $good = 0;
2274                 }
2275                 $edits = $options['changed'] ? 1 : 0;
2276                 $total = $options['created'] ? 1 : 0;
2277
2278                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2279                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2280
2281                 // If this is another user's talk page, update newtalk.
2282                 // Don't do this if $options['changed'] = false (null-edits) nor if
2283                 // it's a minor edit and the user doesn't want notifications for those.
2284                 if ( $options['changed']
2285                         && $this->mTitle->getNamespace() == NS_USER_TALK
2286                         && $shortTitle != $user->getTitleKey()
2287                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2288                 ) {
2289                         $recipient = User::newFromName( $shortTitle, false );
2290                         if ( !$recipient ) {
2291                                 wfDebug( __METHOD__ . ": invalid username\n" );
2292                         } else {
2293                                 // Allow extensions to prevent user notification
2294                                 // when a new message is added to their talk page
2295                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2296                                         if ( User::isIP( $shortTitle ) ) {
2297                                                 // An anonymous user
2298                                                 $recipient->setNewtalk( true, $revision );
2299                                         } elseif ( $recipient->isLoggedIn() ) {
2300                                                 $recipient->setNewtalk( true, $revision );
2301                                         } else {
2302                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2303                                         }
2304                                 }
2305                         }
2306                 }
2307
2308                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2309                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2310                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2311                         if ( $msgtext === false || $msgtext === null ) {
2312                                 $msgtext = '';
2313                         }
2314
2315                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2316
2317                         if ( $wgContLang->hasVariants() ) {
2318                                 $wgContLang->updateConversionTable( $this->mTitle );
2319                         }
2320                 }
2321
2322                 if ( $options['created'] ) {
2323                         self::onArticleCreate( $this->mTitle );
2324                 } elseif ( $options['changed'] ) { // bug 50785
2325                         self::onArticleEdit( $this->mTitle, $revision );
2326                 }
2327         }
2328
2329         /**
2330          * Edit an article without doing all that other stuff
2331          * The article must already exist; link tables etc
2332          * are not updated, caches are not flushed.
2333          *
2334          * @param Content $content Content submitted
2335          * @param User $user The relevant user
2336          * @param string $comment Comment submitted
2337          * @param bool $minor Whereas it's a minor modification
2338          * @param string $serialFormat Format for storing the content in the database
2339          */
2340         public function doQuickEditContent(
2341                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2342         ) {
2343
2344                 $serialized = $content->serialize( $serialFormat );
2345
2346                 $dbw = wfGetDB( DB_MASTER );
2347                 $revision = new Revision( [
2348                         'title'      => $this->getTitle(), // for determining the default content model
2349                         'page'       => $this->getId(),
2350                         'user_text'  => $user->getName(),
2351                         'user'       => $user->getId(),
2352                         'text'       => $serialized,
2353                         'length'     => $content->getSize(),
2354                         'comment'    => $comment,
2355                         'minor_edit' => $minor ? 1 : 0,
2356                 ] ); // XXX: set the content object?
2357                 $revision->insertOn( $dbw );
2358                 $this->updateRevisionOn( $dbw, $revision );
2359
2360                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2361
2362         }
2363
2364         /**
2365          * Update the article's restriction field, and leave a log entry.
2366          * This works for protection both existing and non-existing pages.
2367          *
2368          * @param array $limit Set of restriction keys
2369          * @param array $expiry Per restriction type expiration
2370          * @param int &$cascade Set to false if cascading protection isn't allowed.
2371          * @param string $reason
2372          * @param User $user The user updating the restrictions
2373          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2374          *   ($user should be able to add the specified tags before this is called)
2375          * @return Status Status object; if action is taken, $status->value is the log_id of the
2376          *   protection log entry.
2377          */
2378         public function doUpdateRestrictions( array $limit, array $expiry,
2379                 &$cascade, $reason, User $user, $tags = null
2380         ) {
2381                 global $wgCascadingRestrictionLevels, $wgContLang;
2382
2383                 if ( wfReadOnly() ) {
2384                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2385                 }
2386
2387                 $this->loadPageData( 'fromdbmaster' );
2388                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2389                 $id = $this->getId();
2390
2391                 if ( !$cascade ) {
2392                         $cascade = false;
2393                 }
2394
2395                 // Take this opportunity to purge out expired restrictions
2396                 Title::purgeExpiredRestrictions();
2397
2398                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2399                 // we expect a single selection, but the schema allows otherwise.
2400                 $isProtected = false;
2401                 $protect = false;
2402                 $changed = false;
2403
2404                 $dbw = wfGetDB( DB_MASTER );
2405
2406                 foreach ( $restrictionTypes as $action ) {
2407                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2408                                 $expiry[$action] = 'infinity';
2409                         }
2410                         if ( !isset( $limit[$action] ) ) {
2411                                 $limit[$action] = '';
2412                         } elseif ( $limit[$action] != '' ) {
2413                                 $protect = true;
2414                         }
2415
2416                         // Get current restrictions on $action
2417                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2418                         if ( $current != '' ) {
2419                                 $isProtected = true;
2420                         }
2421
2422                         if ( $limit[$action] != $current ) {
2423                                 $changed = true;
2424                         } elseif ( $limit[$action] != '' ) {
2425                                 // Only check expiry change if the action is actually being
2426                                 // protected, since expiry does nothing on an not-protected
2427                                 // action.
2428                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2429                                         $changed = true;
2430                                 }
2431                         }
2432                 }
2433
2434                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2435                         $changed = true;
2436                 }
2437
2438                 // If nothing has changed, do nothing
2439                 if ( !$changed ) {
2440                         return Status::newGood();
2441                 }
2442
2443                 if ( !$protect ) { // No protection at all means unprotection
2444                         $revCommentMsg = 'unprotectedarticle';
2445                         $logAction = 'unprotect';
2446                 } elseif ( $isProtected ) {
2447                         $revCommentMsg = 'modifiedarticleprotection';
2448                         $logAction = 'modify';
2449                 } else {
2450                         $revCommentMsg = 'protectedarticle';
2451                         $logAction = 'protect';
2452                 }
2453
2454                 // Truncate for whole multibyte characters
2455                 $reason = $wgContLang->truncate( $reason, 255 );
2456
2457                 $logRelationsValues = [];
2458                 $logRelationsField = null;
2459                 $logParamsDetails = [];
2460
2461                 // Null revision (used for change tag insertion)
2462                 $nullRevision = null;
2463
2464                 if ( $id ) { // Protection of existing page
2465                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2466                                 return Status::newGood();
2467                         }
2468
2469                         // Only certain restrictions can cascade...
2470                         $editrestriction = isset( $limit['edit'] )
2471                                 ? [ $limit['edit'] ]
2472                                 : $this->mTitle->getRestrictions( 'edit' );
2473                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2474                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2475                         }
2476                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2477                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2478                         }
2479
2480                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2481                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2482                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2483                         }
2484                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2485                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2486                         }
2487
2488                         // The schema allows multiple restrictions
2489                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2490                                 $cascade = false;
2491                         }
2492
2493                         // insert null revision to identify the page protection change as edit summary
2494                         $latest = $this->getLatest();
2495                         $nullRevision = $this->insertProtectNullRevision(
2496                                 $revCommentMsg,
2497                                 $limit,
2498                                 $expiry,
2499                                 $cascade,
2500                                 $reason,
2501                                 $user
2502                         );
2503
2504                         if ( $nullRevision === null ) {
2505                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2506                         }
2507
2508                         $logRelationsField = 'pr_id';
2509
2510                         // Update restrictions table
2511                         foreach ( $limit as $action => $restrictions ) {
2512                                 $dbw->delete(
2513                                         'page_restrictions',
2514                                         [
2515                                                 'pr_page' => $id,
2516                                                 'pr_type' => $action
2517                                         ],
2518                                         __METHOD__
2519                                 );
2520                                 if ( $restrictions != '' ) {
2521                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2522                                         $dbw->insert(
2523                                                 'page_restrictions',
2524                                                 [
2525                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2526                                                         'pr_page' => $id,
2527                                                         'pr_type' => $action,
2528                                                         'pr_level' => $restrictions,
2529                                                         'pr_cascade' => $cascadeValue,
2530                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2531                                                 ],
2532                                                 __METHOD__
2533                                         );
2534                                         $logRelationsValues[] = $dbw->insertId();
2535                                         $logParamsDetails[] = [
2536                                                 'type' => $action,
2537                                                 'level' => $restrictions,
2538                                                 'expiry' => $expiry[$action],
2539                                                 'cascade' => (bool)$cascadeValue,
2540                                         ];
2541                                 }
2542                         }
2543
2544                         // Clear out legacy restriction fields
2545                         $dbw->update(
2546                                 'page',
2547                                 [ 'page_restrictions' => '' ],
2548                                 [ 'page_id' => $id ],
2549                                 __METHOD__
2550                         );
2551
2552                         Hooks::run( 'NewRevisionFromEditComplete',
2553                                 [ $this, $nullRevision, $latest, $user ] );
2554                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2555                 } else { // Protection of non-existing page (also known as "title protection")
2556                         // Cascade protection is meaningless in this case
2557                         $cascade = false;
2558
2559                         if ( $limit['create'] != '' ) {
2560                                 $dbw->replace( 'protected_titles',
2561                                         [ [ 'pt_namespace', 'pt_title' ] ],
2562                                         [
2563                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2564                                                 'pt_title' => $this->mTitle->getDBkey(),
2565                                                 'pt_create_perm' => $limit['create'],
2566                                                 'pt_timestamp' => $dbw->timestamp(),
2567                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2568                                                 'pt_user' => $user->getId(),
2569                                                 'pt_reason' => $reason,
2570                                         ], __METHOD__
2571                                 );
2572                                 $logParamsDetails[] = [
2573                                         'type' => 'create',
2574                                         'level' => $limit['create'],
2575                                         'expiry' => $expiry['create'],
2576                                 ];
2577                         } else {
2578                                 $dbw->delete( 'protected_titles',
2579                                         [
2580                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2581                                                 'pt_title' => $this->mTitle->getDBkey()
2582                                         ], __METHOD__
2583                                 );
2584                         }
2585                 }
2586
2587                 $this->mTitle->flushRestrictions();
2588                 InfoAction::invalidateCache( $this->mTitle );
2589
2590                 if ( $logAction == 'unprotect' ) {
2591                         $params = [];
2592                 } else {
2593                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2594                         $params = [
2595                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2596                                 '5:bool:cascade' => $cascade,
2597                                 'details' => $logParamsDetails, // parameter for localize and api
2598                         ];
2599                 }
2600
2601                 // Update the protection log
2602                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2603                 $logEntry->setTarget( $this->mTitle );
2604                 $logEntry->setComment( $reason );
2605                 $logEntry->setPerformer( $user );
2606                 $logEntry->setParameters( $params );
2607                 if ( !is_null( $nullRevision ) ) {
2608                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2609                 }
2610                 $logEntry->setTags( $tags );
2611                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2612                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2613                 }
2614                 $logId = $logEntry->insert();
2615                 $logEntry->publish( $logId );
2616
2617                 return Status::newGood( $logId );
2618         }
2619
2620         /**
2621          * Insert a new null revision for this page.
2622          *
2623          * @param string $revCommentMsg Comment message key for the revision
2624          * @param array $limit Set of restriction keys
2625          * @param array $expiry Per restriction type expiration
2626          * @param int $cascade Set to false if cascading protection isn't allowed.
2627          * @param string $reason
2628          * @param User|null $user
2629          * @return Revision|null Null on error
2630          */
2631         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2632                 array $expiry, $cascade, $reason, $user = null
2633         ) {
2634                 global $wgContLang;
2635                 $dbw = wfGetDB( DB_MASTER );
2636
2637                 // Prepare a null revision to be added to the history
2638                 $editComment = $wgContLang->ucfirst(
2639                         wfMessage(
2640                                 $revCommentMsg,
2641                                 $this->mTitle->getPrefixedText()
2642                         )->inContentLanguage()->text()
2643                 );
2644                 if ( $reason ) {
2645                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2646                 }
2647                 $protectDescription = $this->protectDescription( $limit, $expiry );
2648                 if ( $protectDescription ) {
2649                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2650                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2651                                 ->inContentLanguage()->text();
2652                 }
2653                 if ( $cascade ) {
2654                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2655                         $editComment .= wfMessage( 'brackets' )->params(
2656                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2657                         )->inContentLanguage()->text();
2658                 }
2659
2660                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2661                 if ( $nullRev ) {
2662                         $nullRev->insertOn( $dbw );
2663
2664                         // Update page record and touch page
2665                         $oldLatest = $nullRev->getParentId();
2666                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2667                 }
2668
2669                 return $nullRev;
2670         }
2671
2672         /**
2673          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2674          * @return string
2675          */
2676         protected function formatExpiry( $expiry ) {
2677                 global $wgContLang;
2678
2679                 if ( $expiry != 'infinity' ) {
2680                         return wfMessage(
2681                                 'protect-expiring',
2682                                 $wgContLang->timeanddate( $expiry, false, false ),
2683                                 $wgContLang->date( $expiry, false, false ),
2684                                 $wgContLang->time( $expiry, false, false )
2685                         )->inContentLanguage()->text();
2686                 } else {
2687                         return wfMessage( 'protect-expiry-indefinite' )
2688                                 ->inContentLanguage()->text();
2689                 }
2690         }
2691
2692         /**
2693          * Builds the description to serve as comment for the edit.
2694          *
2695          * @param array $limit Set of restriction keys
2696          * @param array $expiry Per restriction type expiration
2697          * @return string
2698          */
2699         public function protectDescription( array $limit, array $expiry ) {
2700                 $protectDescription = '';
2701
2702                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2703                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2704                         # All possible message keys are listed here for easier grepping:
2705                         # * restriction-create
2706                         # * restriction-edit
2707                         # * restriction-move
2708                         # * restriction-upload
2709                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2710                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2711                         # with '' filtered out. All possible message keys are listed below:
2712                         # * protect-level-autoconfirmed
2713                         # * protect-level-sysop
2714                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2715                                 ->inContentLanguage()->text();
2716
2717                         $expiryText = $this->formatExpiry( $expiry[$action] );
2718
2719                         if ( $protectDescription !== '' ) {
2720                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2721                         }
2722                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2723                                 ->params( $actionText, $restrictionsText, $expiryText )
2724                                 ->inContentLanguage()->text();
2725                 }
2726
2727                 return $protectDescription;
2728         }
2729
2730         /**
2731          * Builds the description to serve as comment for the log entry.
2732          *
2733          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2734          * protect description text. Keep them in old format to avoid breaking compatibility.
2735          * TODO: Fix protection log to store structured description and format it on-the-fly.
2736          *
2737          * @param array $limit Set of restriction keys
2738          * @param array $expiry Per restriction type expiration
2739          * @return string
2740          */
2741         public function protectDescriptionLog( array $limit, array $expiry ) {
2742                 global $wgContLang;
2743
2744                 $protectDescriptionLog = '';
2745
2746                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2747                         $expiryText = $this->formatExpiry( $expiry[$action] );
2748                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2749                                 "[$action=$restrictions] ($expiryText)";
2750                 }
2751
2752                 return trim( $protectDescriptionLog );
2753         }
2754
2755         /**
2756          * Take an array of page restrictions and flatten it to a string
2757          * suitable for insertion into the page_restrictions field.
2758          *
2759          * @param string[] $limit
2760          *
2761          * @throws MWException
2762          * @return string
2763          */
2764         protected static function flattenRestrictions( $limit ) {
2765                 if ( !is_array( $limit ) ) {
2766                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2767                 }
2768
2769                 $bits = [];
2770                 ksort( $limit );
2771
2772                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2773                         $bits[] = "$action=$restrictions";
2774                 }
2775
2776                 return implode( ':', $bits );
2777         }
2778
2779         /**
2780          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2781          * backwards compatibility, if you care about error reporting you should use
2782          * doDeleteArticleReal() instead.
2783          *
2784          * Deletes the article with database consistency, writes logs, purges caches
2785          *
2786          * @param string $reason Delete reason for deletion log
2787          * @param bool $suppress Suppress all revisions and log the deletion in
2788          *        the suppression log instead of the deletion log
2789          * @param int $u1 Unused
2790          * @param bool $u2 Unused
2791          * @param array|string &$error Array of errors to append to
2792          * @param User $user The deleting user
2793          * @return bool True if successful
2794          */
2795         public function doDeleteArticle(
2796                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2797         ) {
2798                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2799                 return $status->isGood();
2800         }
2801
2802         /**
2803          * Back-end article deletion
2804          * Deletes the article with database consistency, writes logs, purges caches
2805          *
2806          * @since 1.19
2807          *
2808          * @param string $reason Delete reason for deletion log
2809          * @param bool $suppress Suppress all revisions and log the deletion in
2810          *   the suppression log instead of the deletion log
2811          * @param int $u1 Unused
2812          * @param bool $u2 Unused
2813          * @param array|string &$error Array of errors to append to
2814          * @param User $user The deleting user
2815          * @return Status Status object; if successful, $status->value is the log_id of the
2816          *   deletion log entry. If the page couldn't be deleted because it wasn't
2817          *   found, $status is a non-fatal 'cannotdelete' error
2818          */
2819         public function doDeleteArticleReal(
2820                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2821         ) {
2822                 global $wgUser, $wgContentHandlerUseDB;
2823
2824                 wfDebug( __METHOD__ . "\n" );
2825
2826                 $status = Status::newGood();
2827
2828                 if ( $this->mTitle->getDBkey() === '' ) {
2829                         $status->error( 'cannotdelete',
2830                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2831                         return $status;
2832                 }
2833
2834                 $user = is_null( $user ) ? $wgUser : $user;
2835                 if ( !Hooks::run( 'ArticleDelete',
2836                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2837                 ) ) {
2838                         if ( $status->isOK() ) {
2839                                 // Hook aborted but didn't set a fatal status
2840                                 $status->fatal( 'delete-hook-aborted' );
2841                         }
2842                         return $status;
2843                 }
2844
2845                 $dbw = wfGetDB( DB_MASTER );
2846                 $dbw->startAtomic( __METHOD__ );
2847
2848                 $this->loadPageData( self::READ_LATEST );
2849                 $id = $this->getId();
2850                 // T98706: lock the page from various other updates but avoid using
2851                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2852                 // the revisions queries (which also JOIN on user). Only lock the page
2853                 // row and CAS check on page_latest to see if the trx snapshot matches.
2854                 $lockedLatest = $this->lockAndGetLatest();
2855                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2856                         $dbw->endAtomic( __METHOD__ );
2857                         // Page not there or trx snapshot is stale
2858                         $status->error( 'cannotdelete',
2859                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2860                         return $status;
2861                 }
2862
2863                 // At this point we are now comitted to returning an OK
2864                 // status unless some DB query error or other exception comes up.
2865                 // This way callers don't have to call rollback() if $status is bad
2866                 // unless they actually try to catch exceptions (which is rare).
2867
2868                 // we need to remember the old content so we can use it to generate all deletion updates.
2869                 $content = $this->getContent( Revision::RAW );
2870
2871                 // Bitfields to further suppress the content
2872                 if ( $suppress ) {
2873                         $bitfield = 0;
2874                         // This should be 15...
2875                         $bitfield |= Revision::DELETED_TEXT;
2876                         $bitfield |= Revision::DELETED_COMMENT;
2877                         $bitfield |= Revision::DELETED_USER;
2878                         $bitfield |= Revision::DELETED_RESTRICTED;
2879                 } else {
2880                         $bitfield = 'rev_deleted';
2881                 }
2882
2883                 /**
2884                  * For now, shunt the revision data into the archive table.
2885                  * Text is *not* removed from the text table; bulk storage
2886                  * is left intact to avoid breaking block-compression or
2887                  * immutable storage schemes.
2888                  *
2889                  * For backwards compatibility, note that some older archive
2890                  * table entries will have ar_text and ar_flags fields still.
2891                  *
2892                  * In the future, we may keep revisions and mark them with
2893                  * the rev_deleted field, which is reserved for this purpose.
2894                  */
2895
2896                 $row = [
2897                         'ar_namespace'  => 'page_namespace',
2898                         'ar_title'      => 'page_title',
2899                         'ar_comment'    => 'rev_comment',
2900                         'ar_user'       => 'rev_user',
2901                         'ar_user_text'  => 'rev_user_text',
2902                         'ar_timestamp'  => 'rev_timestamp',
2903                         'ar_minor_edit' => 'rev_minor_edit',
2904                         'ar_rev_id'     => 'rev_id',
2905                         'ar_parent_id'  => 'rev_parent_id',
2906                         'ar_text_id'    => 'rev_text_id',
2907                         'ar_text'       => '\'\'', // Be explicit to appease
2908                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2909                         'ar_len'        => 'rev_len',
2910                         'ar_page_id'    => 'page_id',
2911                         'ar_deleted'    => $bitfield,
2912                         'ar_sha1'       => 'rev_sha1',
2913                 ];
2914
2915                 if ( $wgContentHandlerUseDB ) {
2916                         $row['ar_content_model'] = 'rev_content_model';
2917                         $row['ar_content_format'] = 'rev_content_format';
2918                 }
2919
2920                 // Copy all the page revisions into the archive table
2921                 $dbw->insertSelect(
2922                         'archive',
2923                         [ 'page', 'revision' ],
2924                         $row,
2925                         [
2926                                 'page_id' => $id,
2927                                 'page_id = rev_page'
2928                         ],
2929                         __METHOD__
2930                 );
2931
2932                 // Now that it's safely backed up, delete it
2933                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2934
2935                 if ( !$dbw->cascadingDeletes() ) {
2936                         $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2937                 }
2938
2939                 // Clone the title, so we have the information we need when we log
2940                 $logTitle = clone $this->mTitle;
2941
2942                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2943                 $logtype = $suppress ? 'suppress' : 'delete';
2944
2945                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2946                 $logEntry->setPerformer( $user );
2947                 $logEntry->setTarget( $logTitle );
2948                 $logEntry->setComment( $reason );
2949                 $logid = $logEntry->insert();
2950
2951                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2952                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2953                         $logEntry->publish( $logid );
2954                 } );
2955
2956                 $dbw->endAtomic( __METHOD__ );
2957
2958                 $this->doDeleteUpdates( $id, $content );
2959
2960                 Hooks::run( 'ArticleDeleteComplete',
2961                         [ &$this, &$user, $reason, $id, $content, $logEntry ] );
2962                 $status->value = $logid;
2963
2964                 // Show log excerpt on 404 pages rather than just a link
2965                 $cache = ObjectCache::getMainStashInstance();
2966                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2967                 $cache->set( $key, 1, $cache::TTL_DAY );
2968
2969                 return $status;
2970         }
2971
2972         /**
2973          * Lock the page row for this title+id and return page_latest (or 0)
2974          *
2975          * @return integer Returns 0 if no row was found with this title+id
2976          * @since 1.27
2977          */
2978         public function lockAndGetLatest() {
2979                 return (int)wfGetDB( DB_MASTER )->selectField(
2980                         'page',
2981                         'page_latest',
2982                         [
2983                                 'page_id' => $this->getId(),
2984                                 // Typically page_id is enough, but some code might try to do
2985                                 // updates assuming the title is the same, so verify that
2986                                 'page_namespace' => $this->getTitle()->getNamespace(),
2987                                 'page_title' => $this->getTitle()->getDBkey()
2988                         ],
2989                         __METHOD__,
2990                         [ 'FOR UPDATE' ]
2991                 );
2992         }
2993
2994         /**
2995          * Do some database updates after deletion
2996          *
2997          * @param int $id The page_id value of the page being deleted
2998          * @param Content $content Optional page content to be used when determining
2999          *   the required updates. This may be needed because $this->getContent()
3000          *   may already return null when the page proper was deleted.
3001          */
3002         public function doDeleteUpdates( $id, Content $content = null ) {
3003                 // Update site status
3004                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
3005
3006                 // Delete pagelinks, update secondary indexes, etc
3007                 $updates = $this->getDeletionUpdates( $content );
3008                 foreach ( $updates as $update ) {
3009                         DeferredUpdates::addUpdate( $update );
3010                 }
3011
3012                 // Reparse any pages transcluding this page
3013                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3014
3015                 // Reparse any pages including this image
3016                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3017                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3018                 }
3019
3020                 // Clear caches
3021                 WikiPage::onArticleDelete( $this->mTitle );
3022
3023                 // Reset this object and the Title object
3024                 $this->loadFromRow( false, self::READ_LATEST );
3025
3026                 // Search engine
3027                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3028         }
3029
3030         /**
3031          * Roll back the most recent consecutive set of edits to a page
3032          * from the same user; fails if there are no eligible edits to
3033          * roll back to, e.g. user is the sole contributor. This function
3034          * performs permissions checks on $user, then calls commitRollback()
3035          * to do the dirty work
3036          *
3037          * @todo Separate the business/permission stuff out from backend code
3038          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3039          *
3040          * @param string $fromP Name of the user whose edits to rollback.
3041          * @param string $summary Custom summary. Set to default summary if empty.
3042          * @param string $token Rollback token.
3043          * @param bool $bot If true, mark all reverted edits as bot.
3044          *
3045          * @param array $resultDetails Array contains result-specific array of additional values
3046          *    'alreadyrolled' : 'current' (rev)
3047          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3048          *
3049          * @param User $user The user performing the rollback
3050          * @param array|null $tags Change tags to apply to the rollback
3051          * Callers are responsible for permission checks
3052          * (with ChangeTags::canAddTagsAccompanyingChange)
3053          *
3054          * @return array Array of errors, each error formatted as
3055          *   array(messagekey, param1, param2, ...).
3056          * On success, the array is empty.  This array can also be passed to
3057          * OutputPage::showPermissionsErrorPage().
3058          */
3059         public function doRollback(
3060                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3061         ) {
3062                 $resultDetails = null;
3063
3064                 // Check permissions
3065                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3066                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3067                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3068
3069                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3070                         $errors[] = [ 'sessionfailure' ];
3071                 }
3072
3073                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3074                         $errors[] = [ 'actionthrottledtext' ];
3075                 }
3076
3077                 // If there were errors, bail out now
3078                 if ( !empty( $errors ) ) {
3079                         return $errors;
3080                 }
3081
3082                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3083         }
3084
3085         /**
3086          * Backend implementation of doRollback(), please refer there for parameter
3087          * and return value documentation
3088          *
3089          * NOTE: This function does NOT check ANY permissions, it just commits the
3090          * rollback to the DB. Therefore, you should only call this function direct-
3091          * ly if you want to use custom permissions checks. If you don't, use
3092          * doRollback() instead.
3093          * @param string $fromP Name of the user whose edits to rollback.
3094          * @param string $summary Custom summary. Set to default summary if empty.
3095          * @param bool $bot If true, mark all reverted edits as bot.
3096          *
3097          * @param array $resultDetails Contains result-specific array of additional values
3098          * @param User $guser The user performing the rollback
3099          * @param array|null $tags Change tags to apply to the rollback
3100          * Callers are responsible for permission checks
3101          * (with ChangeTags::canAddTagsAccompanyingChange)
3102          *
3103          * @return array
3104          */
3105         public function commitRollback( $fromP, $summary, $bot,
3106                 &$resultDetails, User $guser, $tags = null
3107         ) {
3108                 global $wgUseRCPatrol, $wgContLang;
3109
3110                 $dbw = wfGetDB( DB_MASTER );
3111
3112                 if ( wfReadOnly() ) {
3113                         return [ [ 'readonlytext' ] ];
3114                 }
3115
3116                 // Get the last editor
3117                 $current = $this->getRevision();
3118                 if ( is_null( $current ) ) {
3119                         // Something wrong... no page?
3120                         return [ [ 'notanarticle' ] ];
3121                 }
3122
3123                 $from = str_replace( '_', ' ', $fromP );
3124                 // User name given should match up with the top revision.
3125                 // If the user was deleted then $from should be empty.
3126                 if ( $from != $current->getUserText() ) {
3127                         $resultDetails = [ 'current' => $current ];
3128                         return [ [ 'alreadyrolled',
3129                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3130                                 htmlspecialchars( $fromP ),
3131                                 htmlspecialchars( $current->getUserText() )
3132                         ] ];
3133                 }
3134
3135                 // Get the last edit not by this person...
3136                 // Note: these may not be public values
3137                 $user = intval( $current->getUser( Revision::RAW ) );
3138                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3139                 $s = $dbw->selectRow( 'revision',
3140                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3141                         [ 'rev_page' => $current->getPage(),
3142                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3143                         ], __METHOD__,
3144                         [ 'USE INDEX' => 'page_timestamp',
3145                                 'ORDER BY' => 'rev_timestamp DESC' ]
3146                         );
3147                 if ( $s === false ) {
3148                         // No one else ever edited this page
3149                         return [ [ 'cantrollback' ] ];
3150                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3151                         || $s->rev_deleted & Revision::DELETED_USER
3152                 ) {
3153                         // Only admins can see this text
3154                         return [ [ 'notvisiblerev' ] ];
3155                 }
3156
3157                 // Generate the edit summary if necessary
3158                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3159                 if ( empty( $summary ) ) {
3160                         if ( $from == '' ) { // no public user name
3161                                 $summary = wfMessage( 'revertpage-nouser' );
3162                         } else {
3163                                 $summary = wfMessage( 'revertpage' );
3164                         }
3165                 }
3166
3167                 // Allow the custom summary to use the same args as the default message
3168                 $args = [
3169                         $target->getUserText(), $from, $s->rev_id,
3170                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3171                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3172                 ];
3173                 if ( $summary instanceof Message ) {
3174                         $summary = $summary->params( $args )->inContentLanguage()->text();
3175                 } else {
3176                         $summary = wfMsgReplaceArgs( $summary, $args );
3177                 }
3178
3179                 // Trim spaces on user supplied text
3180                 $summary = trim( $summary );
3181
3182                 // Truncate for whole multibyte characters.
3183                 $summary = $wgContLang->truncate( $summary, 255 );
3184
3185                 // Save
3186                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3187
3188                 if ( $guser->isAllowed( 'minoredit' ) ) {
3189                         $flags |= EDIT_MINOR;
3190                 }
3191
3192                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3193                         $flags |= EDIT_FORCE_BOT;
3194                 }
3195
3196                 // Actually store the edit
3197                 $status = $this->doEditContent(
3198                         $target->getContent(),
3199                         $summary,
3200                         $flags,
3201                         $target->getId(),
3202                         $guser,
3203                         null,
3204                         $tags
3205                 );
3206
3207                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3208                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3209                 $set = [];
3210                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3211                         // Mark all reverted edits as bot
3212                         $set['rc_bot'] = 1;
3213                 }
3214
3215                 if ( $wgUseRCPatrol ) {
3216                         // Mark all reverted edits as patrolled
3217                         $set['rc_patrolled'] = 1;
3218                 }
3219
3220                 if ( count( $set ) ) {
3221                         $dbw->update( 'recentchanges', $set,
3222                                 [ /* WHERE */
3223                                         'rc_cur_id' => $current->getPage(),
3224                                         'rc_user_text' => $current->getUserText(),
3225                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3226                                 ],
3227                                 __METHOD__
3228                         );
3229                 }
3230
3231                 if ( !$status->isOK() ) {
3232                         return $status->getErrorsArray();
3233                 }
3234
3235                 // raise error, when the edit is an edit without a new version
3236                 $statusRev = isset( $status->value['revision'] )
3237                         ? $status->value['revision']
3238                         : null;
3239                 if ( !( $statusRev instanceof Revision ) ) {
3240                         $resultDetails = [ 'current' => $current ];
3241                         return [ [ 'alreadyrolled',
3242                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3243                                         htmlspecialchars( $fromP ),
3244                                         htmlspecialchars( $current->getUserText() )
3245                         ] ];
3246                 }
3247
3248                 $revId = $statusRev->getId();
3249
3250                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3251
3252                 $resultDetails = [
3253                         'summary' => $summary,
3254                         'current' => $current,
3255                         'target' => $target,
3256                         'newid' => $revId
3257                 ];
3258
3259                 return [];
3260         }
3261
3262         /**
3263          * The onArticle*() functions are supposed to be a kind of hooks
3264          * which should be called whenever any of the specified actions
3265          * are done.
3266          *
3267          * This is a good place to put code to clear caches, for instance.
3268          *
3269          * This is called on page move and undelete, as well as edit
3270          *
3271          * @param Title $title
3272          */
3273         public static function onArticleCreate( Title $title ) {
3274                 // Update existence markers on article/talk tabs...
3275                 $other = $title->getOtherPage();
3276
3277                 $other->purgeSquid();
3278
3279                 $title->touchLinks();
3280                 $title->purgeSquid();
3281                 $title->deleteTitleProtection();
3282         }
3283
3284         /**
3285          * Clears caches when article is deleted
3286          *
3287          * @param Title $title
3288          */
3289         public static function onArticleDelete( Title $title ) {
3290                 global $wgContLang;
3291
3292                 // Update existence markers on article/talk tabs...
3293                 $other = $title->getOtherPage();
3294
3295                 $other->purgeSquid();
3296
3297                 $title->touchLinks();
3298                 $title->purgeSquid();
3299
3300                 // File cache
3301                 HTMLFileCache::clearFileCache( $title );
3302                 InfoAction::invalidateCache( $title );
3303
3304                 // Messages
3305                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3306                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3307
3308                         if ( $wgContLang->hasVariants() ) {
3309                                 $wgContLang->updateConversionTable( $title );
3310                         }
3311                 }
3312
3313                 // Images
3314                 if ( $title->getNamespace() == NS_FILE ) {
3315                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3316                 }
3317
3318                 // User talk pages
3319                 if ( $title->getNamespace() == NS_USER_TALK ) {
3320                         $user = User::newFromName( $title->getText(), false );
3321                         if ( $user ) {
3322                                 $user->setNewtalk( false );
3323                         }
3324                 }
3325
3326                 // Image redirects
3327                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3328         }
3329
3330         /**
3331          * Purge caches on page update etc
3332          *
3333          * @param Title $title
3334          * @param Revision|null $revision Revision that was just saved, may be null
3335          */
3336         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3337                 // Invalidate caches of articles which include this page
3338                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3339
3340                 // Invalidate the caches of all pages which redirect here
3341                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3342
3343                 // Purge CDN for this page only
3344                 $title->purgeSquid();
3345                 // Clear file cache for this page only
3346                 HTMLFileCache::clearFileCache( $title );
3347
3348                 $revid = $revision ? $revision->getId() : null;
3349                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3350                         InfoAction::invalidateCache( $title, $revid );
3351                 } );
3352         }
3353
3354         /**#@-*/
3355
3356         /**
3357          * Returns a list of categories this page is a member of.
3358          * Results will include hidden categories
3359          *
3360          * @return TitleArray
3361          */
3362         public function getCategories() {
3363                 $id = $this->getId();
3364                 if ( $id == 0 ) {
3365                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3366                 }
3367
3368                 $dbr = wfGetDB( DB_SLAVE );
3369                 $res = $dbr->select( 'categorylinks',
3370                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3371                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3372                         // as not being aliases, and NS_CATEGORY is numeric
3373                         [ 'cl_from' => $id ],
3374                         __METHOD__ );
3375
3376                 return TitleArray::newFromResult( $res );
3377         }
3378
3379         /**
3380          * Returns a list of hidden categories this page is a member of.
3381          * Uses the page_props and categorylinks tables.
3382          *
3383          * @return array Array of Title objects
3384          */
3385         public function getHiddenCategories() {
3386                 $result = [];
3387                 $id = $this->getId();
3388
3389                 if ( $id == 0 ) {
3390                         return [];
3391                 }
3392
3393                 $dbr = wfGetDB( DB_SLAVE );
3394                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3395                         [ 'cl_to' ],
3396                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3397                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3398                         __METHOD__ );
3399
3400                 if ( $res !== false ) {
3401                         foreach ( $res as $row ) {
3402                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3403                         }
3404                 }
3405
3406                 return $result;
3407         }
3408
3409         /**
3410          * Return an applicable autosummary if one exists for the given edit.
3411          * @param string|null $oldtext The previous text of the page.
3412          * @param string|null $newtext The submitted text of the page.
3413          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3414          * @return string An appropriate autosummary, or an empty string.
3415          *
3416          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3417          */
3418         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3419                 // NOTE: stub for backwards-compatibility. assumes the given text is
3420                 // wikitext. will break horribly if it isn't.
3421
3422                 ContentHandler::deprecated( __METHOD__, '1.21' );
3423
3424                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3425                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3426                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3427
3428                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3429         }
3430
3431         /**
3432          * Auto-generates a deletion reason
3433          *
3434          * @param bool &$hasHistory Whether the page has a history
3435          * @return string|bool String containing deletion reason or empty string, or boolean false
3436          *    if no revision occurred
3437          */
3438         public function getAutoDeleteReason( &$hasHistory ) {
3439                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3440         }
3441
3442         /**
3443          * Update all the appropriate counts in the category table, given that
3444          * we've added the categories $added and deleted the categories $deleted.
3445          *
3446          * @param array $added The names of categories that were added
3447          * @param array $deleted The names of categories that were deleted
3448          * @param integer $id Page ID (this should be the original deleted page ID)
3449          */
3450         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3451                 $id = $id ?: $this->getId();
3452                 $dbw = wfGetDB( DB_MASTER );
3453                 $method = __METHOD__;
3454                 // Do this at the end of the commit to reduce lock wait timeouts
3455                 $dbw->onTransactionPreCommitOrIdle(
3456                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3457                                 $ns = $this->getTitle()->getNamespace();
3458
3459                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3460                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3461                                 if ( $ns == NS_CATEGORY ) {
3462                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3463                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3464                                 } elseif ( $ns == NS_FILE ) {
3465                                         $addFields[] = 'cat_files = cat_files + 1';
3466                                         $removeFields[] = 'cat_files = cat_files - 1';
3467                                 }
3468
3469                                 if ( count( $added ) ) {
3470                                         $existingAdded = $dbw->selectFieldValues(
3471                                                 'category',
3472                                                 'cat_title',
3473                                                 [ 'cat_title' => $added ],
3474                                                 $method
3475                                         );
3476
3477                                         // For category rows that already exist, do a plain
3478                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3479                                         // to avoid creating gaps in the cat_id sequence.
3480                                         if ( count( $existingAdded ) ) {
3481                                                 $dbw->update(
3482                                                         'category',
3483                                                         $addFields,
3484                                                         [ 'cat_title' => $existingAdded ],
3485                                                         $method
3486                                                 );
3487                                         }
3488
3489                                         $missingAdded = array_diff( $added, $existingAdded );
3490                                         if ( count( $missingAdded ) ) {
3491                                                 $insertRows = [];
3492                                                 foreach ( $missingAdded as $cat ) {
3493                                                         $insertRows[] = [
3494                                                                 'cat_title'   => $cat,
3495                                                                 'cat_pages'   => 1,
3496                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3497                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3498                                                         ];
3499                                                 }
3500                                                 $dbw->upsert(
3501                                                         'category',
3502                                                         $insertRows,
3503                                                         [ 'cat_title' ],
3504                                                         $addFields,
3505                                                         $method
3506                                                 );
3507                                         }
3508                                 }
3509
3510                                 if ( count( $deleted ) ) {
3511                                         $dbw->update(
3512                                                 'category',
3513                                                 $removeFields,
3514                                                 [ 'cat_title' => $deleted ],
3515                                                 $method
3516                                         );
3517                                 }
3518
3519                                 foreach ( $added as $catName ) {
3520                                         $cat = Category::newFromName( $catName );
3521                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3522                                 }
3523
3524                                 foreach ( $deleted as $catName ) {
3525                                         $cat = Category::newFromName( $catName );
3526                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3527                                 }
3528                         }
3529                 );
3530         }
3531
3532         /**
3533          * Opportunistically enqueue link update jobs given fresh parser output if useful
3534          *
3535          * @param ParserOutput $parserOutput Current version page output
3536          * @since 1.25
3537          */
3538         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3539                 if ( wfReadOnly() ) {
3540                         return;
3541                 }
3542
3543                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3544                         [ $this, $this->mTitle, $parserOutput ]
3545                 ) ) {
3546                         return;
3547                 }
3548
3549                 $config = RequestContext::getMain()->getConfig();
3550
3551                 $params = [
3552                         'isOpportunistic' => true,
3553                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3554                 ];
3555
3556                 if ( $this->mTitle->areRestrictionsCascading() ) {
3557                         // If the page is cascade protecting, the links should really be up-to-date
3558                         JobQueueGroup::singleton()->lazyPush(
3559                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3560                         );
3561                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3562                         // Assume the output contains "dynamic" time/random based magic words.
3563                         // Only update pages that expired due to dynamic content and NOT due to edits
3564                         // to referenced templates/files. When the cache expires due to dynamic content,
3565                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3566                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3567                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3568                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3569                                 // If a page is uncacheable, do not keep spamming a job for it.
3570                                 // Although it would be de-duplicated, it would still waste I/O.
3571                                 $cache = ObjectCache::getLocalClusterInstance();
3572                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3573                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3574                                 if ( $cache->add( $key, time(), $ttl ) ) {
3575                                         JobQueueGroup::singleton()->lazyPush(
3576                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3577                                         );
3578                                 }
3579                         }
3580                 }
3581         }
3582
3583         /**
3584          * Returns a list of updates to be performed when this page is deleted. The
3585          * updates should remove any information about this page from secondary data
3586          * stores such as links tables.
3587          *
3588          * @param Content|null $content Optional Content object for determining the
3589          *   necessary updates.
3590          * @return DataUpdate[]
3591          */
3592         public function getDeletionUpdates( Content $content = null ) {
3593                 if ( !$content ) {
3594                         // load content object, which may be used to determine the necessary updates.
3595                         // XXX: the content may not be needed to determine the updates.
3596                         $content = $this->getContent( Revision::RAW );
3597                 }
3598
3599                 if ( !$content ) {
3600                         $updates = [];
3601                 } else {
3602                         $updates = $content->getDeletionUpdates( $this );
3603                 }
3604
3605                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3606                 return $updates;
3607         }
3608 }