includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * Class representing a MediaWiki article and history.
  27  *
  28  * Some fields are public only for backwards-compatibility. Use accessors.
  29  * In the past, this class was part of Article.php and everything was public.
  30  */
  31 class WikiPage implements Page, IDBAccessObject {
  32         // Constants for $mDataLoadedFrom and related
  33
  34         /**
  35          * @var Title
  36          */
  37         public $mTitle = null;
  38
  39         /**@{{
  40          * @protected
  41          */
  42         public $mDataLoaded = false;         // !< Boolean
  43         public $mIsRedirect = false;         // !< Boolean
  44         public $mLatest = false;             // !< Integer (false means "not loaded")
  45         /**@}}*/
  46
  47         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  48         public $mPreparedEdit = false;
  49
  50         /**
  51          * @var int
  52          */
  53         protected $mId = null;
  54
  55         /**
  56          * @var int One of the READ_* constants
  57          */
  58         protected $mDataLoadedFrom = self::READ_NONE;
  59
  60         /**
  61          * @var Title
  62          */
  63         protected $mRedirectTarget = null;
  64
  65         /**
  66          * @var Revision
  67          */
  68         protected $mLastRevision = null;
  69
  70         /**
  71          * @var string Timestamp of the current revision or empty string if not loaded
  72          */
  73         protected $mTimestamp = '';
  74
  75         /**
  76          * @var string
  77          */
  78         protected $mTouched = '19700101000000';
  79
  80         /**
  81          * @var string
  82          */
  83         protected $mLinksUpdated = '19700101000000';
  84
  85         /**
  86          * Constructor and clear the article
  87          * @param Title $title Reference to a Title object.
  88          */
  89         public function __construct( Title $title ) {
  90                 $this->mTitle = $title;
  91         }
  92
  93         /**
  94          * Create a WikiPage object of the appropriate class for the given title.
  95          *
  96          * @param Title $title
  97          *
  98          * @throws MWException
  99          * @return WikiPage|WikiCategoryPage|WikiFilePage
 100          */
 101         public static function factory( Title $title ) {
 102                 $ns = $title->getNamespace();
 103
 104                 if ( $ns == NS_MEDIA ) {
 105                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 106                 } elseif ( $ns < 0 ) {
 107                         throw new MWException( "Invalid or virtual namespace $ns given." );
 108                 }
 109
 110                 switch ( $ns ) {
 111                         case NS_FILE:
 112                                 $page = new WikiFilePage( $title );
 113                                 break;
 114                         case NS_CATEGORY:
 115                                 $page = new WikiCategoryPage( $title );
 116                                 break;
 117                         default:
 118                                 $page = new WikiPage( $title );
 119                 }
 120
 121                 return $page;
 122         }
 123
 124         /**
 125          * Constructor from a page id
 126          *
 127          * @param int $id Article ID to load
 128          * @param string|int $from One of the following values:
 129          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 130          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 131          *
 132          * @return WikiPage|null
 133          */
 134         public static function newFromID( $id, $from = 'fromdb' ) {
 135                 // page id's are never 0 or negative, see bug 61166
 136                 if ( $id < 1 ) {
 137                         return null;
 138                 }
 139
 140                 $from = self::convertSelectType( $from );
 141                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 142                 $row = $db->selectRow(
 143                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 144                 if ( !$row ) {
 145                         return null;
 146                 }
 147                 return self::newFromRow( $row, $from );
 148         }
 149
 150         /**
 151          * Constructor from a database row
 152          *
 153          * @since 1.20
 154          * @param object $row Database row containing at least fields returned by selectFields().
 155          * @param string|int $from Source of $data:
 156          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 157          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 158          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 159          * @return WikiPage
 160          */
 161         public static function newFromRow( $row, $from = 'fromdb' ) {
 162                 $page = self::factory( Title::newFromRow( $row ) );
 163                 $page->loadFromRow( $row, $from );
 164                 return $page;
 165         }
 166
 167         /**
 168          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 169          *
 170          * @param object|string|int $type
 171          * @return mixed
 172          */
 173         private static function convertSelectType( $type ) {
 174                 switch ( $type ) {
 175                 case 'fromdb':
 176                         return self::READ_NORMAL;
 177                 case 'fromdbmaster':
 178                         return self::READ_LATEST;
 179                 case 'forupdate':
 180                         return self::READ_LOCKING;
 181                 default:
 182                         // It may already be an integer or whatever else
 183                         return $type;
 184                 }
 185         }
 186
 187         /**
 188          * @todo Move this UI stuff somewhere else
 189          *
 190          * @see ContentHandler::getActionOverrides
 191          */
 192         public function getActionOverrides() {
 193                 return $this->getContentHandler()->getActionOverrides();
 194         }
 195
 196         /**
 197          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 198          *
 199          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 200          *
 201          * @return ContentHandler
 202          *
 203          * @since 1.21
 204          */
 205         public function getContentHandler() {
 206                 return ContentHandler::getForModelID( $this->getContentModel() );
 207         }
 208
 209         /**
 210          * Get the title object of the article
 211          * @return Title Title object of this page
 212          */
 213         public function getTitle() {
 214                 return $this->mTitle;
 215         }
 216
 217         /**
 218          * Clear the object
 219          * @return void
 220          */
 221         public function clear() {
 222                 $this->mDataLoaded = false;
 223                 $this->mDataLoadedFrom = self::READ_NONE;
 224
 225                 $this->clearCacheFields();
 226         }
 227
 228         /**
 229          * Clear the object cache fields
 230          * @return void
 231          */
 232         protected function clearCacheFields() {
 233                 $this->mId = null;
 234                 $this->mRedirectTarget = null; // Title object if set
 235                 $this->mLastRevision = null; // Latest revision
 236                 $this->mTouched = '19700101000000';
 237                 $this->mLinksUpdated = '19700101000000';
 238                 $this->mTimestamp = '';
 239                 $this->mIsRedirect = false;
 240                 $this->mLatest = false;
 241                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 242                 // the requested rev ID and content against the cached one for equality. For most
 243                 // content types, the output should not change during the lifetime of this cache.
 244                 // Clearing it can cause extra parses on edit for no reason.
 245         }
 246
 247         /**
 248          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 249          * @return void
 250          * @since 1.23
 251          */
 252         public function clearPreparedEdit() {
 253                 $this->mPreparedEdit = false;
 254         }
 255
 256         /**
 257          * Return the list of revision fields that should be selected to create
 258          * a new page.
 259          *
 260          * @return array
 261          */
 262         public static function selectFields() {
 263                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 264
 265                 $fields = [
 266                         'page_id',
 267                         'page_namespace',
 268                         'page_title',
 269                         'page_restrictions',
 270                         'page_is_redirect',
 271                         'page_is_new',
 272                         'page_random',
 273                         'page_touched',
 274                         'page_links_updated',
 275                         'page_latest',
 276                         'page_len',
 277                 ];
 278
 279                 if ( $wgContentHandlerUseDB ) {
 280                         $fields[] = 'page_content_model';
 281                 }
 282
 283                 if ( $wgPageLanguageUseDB ) {
 284                         $fields[] = 'page_lang';
 285                 }
 286
 287                 return $fields;
 288         }
 289
 290         /**
 291          * Fetch a page record with the given conditions
 292          * @param IDatabase $dbr
 293          * @param array $conditions
 294          * @param array $options
 295          * @return object|bool Database result resource, or false on failure
 296          */
 297         protected function pageData( $dbr, $conditions, $options = [] ) {
 298                 $fields = self::selectFields();
 299
 300                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 301
 302                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 303
 304                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 305
 306                 return $row;
 307         }
 308
 309         /**
 310          * Fetch a page record matching the Title object's namespace and title
 311          * using a sanitized title string
 312          *
 313          * @param IDatabase $dbr
 314          * @param Title $title
 315          * @param array $options
 316          * @return object|bool Database result resource, or false on failure
 317          */
 318         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 319                 return $this->pageData( $dbr, [
 320                         'page_namespace' => $title->getNamespace(),
 321                         'page_title' => $title->getDBkey() ], $options );
 322         }
 323
 324         /**
 325          * Fetch a page record matching the requested ID
 326          *
 327          * @param IDatabase $dbr
 328          * @param int $id
 329          * @param array $options
 330          * @return object|bool Database result resource, or false on failure
 331          */
 332         public function pageDataFromId( $dbr, $id, $options = [] ) {
 333                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 334         }
 335
 336         /**
 337          * Load the object from a given source by title
 338          *
 339          * @param object|string|int $from One of the following:
 340          *   - A DB query result object.
 341          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 342          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 343          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 344          *     using SELECT FOR UPDATE.
 345          *
 346          * @return void
 347          */
 348         public function loadPageData( $from = 'fromdb' ) {
 349                 $from = self::convertSelectType( $from );
 350                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 351                         // We already have the data from the correct location, no need to load it twice.
 352                         return;
 353                 }
 354
 355                 if ( is_int( $from ) ) {
 356                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 357                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 358
 359                         if ( !$data
 360                                 && $index == DB_SLAVE
 361                                 && wfGetLB()->getServerCount() > 1
 362                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 363                         ) {
 364                                 $from = self::READ_LATEST;
 365                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 366                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 367                         }
 368                 } else {
 369                         // No idea from where the caller got this data, assume slave database.
 370                         $data = $from;
 371                         $from = self::READ_NORMAL;
 372                 }
 373
 374                 $this->loadFromRow( $data, $from );
 375         }
 376
 377         /**
 378          * Load the object from a database row
 379          *
 380          * @since 1.20
 381          * @param object|bool $data DB row containing fields returned by selectFields() or false
 382          * @param string|int $from One of the following:
 383          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 384          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 385          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 386          *          the master DB using SELECT FOR UPDATE
 387          */
 388         public function loadFromRow( $data, $from ) {
 389                 $lc = LinkCache::singleton();
 390                 $lc->clearLink( $this->mTitle );
 391
 392                 if ( $data ) {
 393                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 394
 395                         $this->mTitle->loadFromRow( $data );
 396
 397                         // Old-fashioned restrictions
 398                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 399
 400                         $this->mId = intval( $data->page_id );
 401                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 402                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 403                         $this->mIsRedirect = intval( $data->page_is_redirect );
 404                         $this->mLatest = intval( $data->page_latest );
 405                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 406                         // Double-check the ID of any cached latest Revision object for consistency.
 407                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 408                                 $this->mLastRevision = null;
 409                                 $this->mTimestamp = '';
 410                         }
 411                 } else {
 412                         $lc->addBadLinkObj( $this->mTitle );
 413
 414                         $this->mTitle->loadFromRow( false );
 415
 416                         $this->clearCacheFields();
 417
 418                         $this->mId = 0;
 419                 }
 420
 421                 $this->mDataLoaded = true;
 422                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 423         }
 424
 425         /**
 426          * @return int Page ID
 427          */
 428         public function getId() {
 429                 if ( !$this->mDataLoaded ) {
 430                         $this->loadPageData();
 431                 }
 432                 return $this->mId;
 433         }
 434
 435         /**
 436          * @return bool Whether or not the page exists in the database
 437          */
 438         public function exists() {
 439                 if ( !$this->mDataLoaded ) {
 440                         $this->loadPageData();
 441                 }
 442                 return $this->mId > 0;
 443         }
 444
 445         /**
 446          * Check if this page is something we're going to be showing
 447          * some sort of sensible content for. If we return false, page
 448          * views (plain action=view) will return an HTTP 404 response,
 449          * so spiders and robots can know they're following a bad link.
 450          *
 451          * @return bool
 452          */
 453         public function hasViewableContent() {
 454                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 455         }
 456
 457         /**
 458          * Tests if the article content represents a redirect
 459          *
 460          * @return bool
 461          */
 462         public function isRedirect() {
 463                 if ( !$this->mDataLoaded ) {
 464                         $this->loadPageData();
 465                 }
 466
 467                 return (bool)$this->mIsRedirect;
 468         }
 469
 470         /**
 471          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 472          *
 473          * Will use the revisions actual content model if the page exists,
 474          * and the page's default if the page doesn't exist yet.
 475          *
 476          * @return string
 477          *
 478          * @since 1.21
 479          */
 480         public function getContentModel() {
 481                 if ( $this->exists() ) {
 482                         // look at the revision's actual content model
 483                         $rev = $this->getRevision();
 484
 485                         if ( $rev !== null ) {
 486                                 return $rev->getContentModel();
 487                         } else {
 488                                 $title = $this->mTitle->getPrefixedDBkey();
 489                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 490                         }
 491                 }
 492
 493                 // use the default model for this page
 494                 return $this->mTitle->getContentModel();
 495         }
 496
 497         /**
 498          * Loads page_touched and returns a value indicating if it should be used
 499          * @return bool True if not a redirect
 500          */
 501         public function checkTouched() {
 502                 if ( !$this->mDataLoaded ) {
 503                         $this->loadPageData();
 504                 }
 505                 return !$this->mIsRedirect;
 506         }
 507
 508         /**
 509          * Get the page_touched field
 510          * @return string Containing GMT timestamp
 511          */
 512         public function getTouched() {
 513                 if ( !$this->mDataLoaded ) {
 514                         $this->loadPageData();
 515                 }
 516                 return $this->mTouched;
 517         }
 518
 519         /**
 520          * Get the page_links_updated field
 521          * @return string|null Containing GMT timestamp
 522          */
 523         public function getLinksTimestamp() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return $this->mLinksUpdated;
 528         }
 529
 530         /**
 531          * Get the page_latest field
 532          * @return int The rev_id of current revision
 533          */
 534         public function getLatest() {
 535                 if ( !$this->mDataLoaded ) {
 536                         $this->loadPageData();
 537                 }
 538                 return (int)$this->mLatest;
 539         }
 540
 541         /**
 542          * Get the Revision object of the oldest revision
 543          * @return Revision|null
 544          */
 545         public function getOldestRevision() {
 546
 547                 // Try using the slave database first, then try the master
 548                 $continue = 2;
 549                 $db = wfGetDB( DB_SLAVE );
 550                 $revSelectFields = Revision::selectFields();
 551
 552                 $row = null;
 553                 while ( $continue ) {
 554                         $row = $db->selectRow(
 555                                 [ 'page', 'revision' ],
 556                                 $revSelectFields,
 557                                 [
 558                                         'page_namespace' => $this->mTitle->getNamespace(),
 559                                         'page_title' => $this->mTitle->getDBkey(),
 560                                         'rev_page = page_id'
 561                                 ],
 562                                 __METHOD__,
 563                                 [
 564                                         'ORDER BY' => 'rev_timestamp ASC'
 565                                 ]
 566                         );
 567
 568                         if ( $row ) {
 569                                 $continue = 0;
 570                         } else {
 571                                 $db = wfGetDB( DB_MASTER );
 572                                 $continue--;
 573                         }
 574                 }
 575
 576                 return $row ? Revision::newFromRow( $row ) : null;
 577         }
 578
 579         /**
 580          * Loads everything except the text
 581          * This isn't necessary for all uses, so it's only done if needed.
 582          */
 583         protected function loadLastEdit() {
 584                 if ( $this->mLastRevision !== null ) {
 585                         return; // already loaded
 586                 }
 587
 588                 $latest = $this->getLatest();
 589                 if ( !$latest ) {
 590                         return; // page doesn't exist or is missing page_latest info
 591                 }
 592
 593                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 594                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 595                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 596                         // transactions, where S1 normally only sees changes committed before the first S1
 597                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 598                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 599                         // happened after the first S1 SELECT.
 600                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 601                         $flags = Revision::READ_LOCKING;
 602                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 603                         // Bug T93976: if page_latest was loaded from the master, fetch the
 604                         // revision from there as well, as it may not exist yet on a slave DB.
 605                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 606                         $flags = Revision::READ_LATEST;
 607                 } else {
 608                         $flags = 0;
 609                 }
 610                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 611                 if ( $revision ) { // sanity
 612                         $this->setLastEdit( $revision );
 613                 }
 614         }
 615
 616         /**
 617          * Set the latest revision
 618          * @param Revision $revision
 619          */
 620         protected function setLastEdit( Revision $revision ) {
 621                 $this->mLastRevision = $revision;
 622                 $this->mTimestamp = $revision->getTimestamp();
 623         }
 624
 625         /**
 626          * Get the latest revision
 627          * @return Revision|null
 628          */
 629         public function getRevision() {
 630                 $this->loadLastEdit();
 631                 if ( $this->mLastRevision ) {
 632                         return $this->mLastRevision;
 633                 }
 634                 return null;
 635         }
 636
 637         /**
 638          * Get the content of the current revision. No side-effects...
 639          *
 640          * @param int $audience One of:
 641          *   Revision::FOR_PUBLIC       to be displayed to all users
 642          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 643          *   Revision::RAW              get the text regardless of permissions
 644          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 645          *   to the $audience parameter
 646          * @return Content|null The content of the current revision
 647          *
 648          * @since 1.21
 649          */
 650         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 651                 $this->loadLastEdit();
 652                 if ( $this->mLastRevision ) {
 653                         return $this->mLastRevision->getContent( $audience, $user );
 654                 }
 655                 return null;
 656         }
 657
 658         /**
 659          * Get the text of the current revision. No side-effects...
 660          *
 661          * @param int $audience One of:
 662          *   Revision::FOR_PUBLIC       to be displayed to all users
 663          *   Revision::FOR_THIS_USER    to be displayed to the given user
 664          *   Revision::RAW              get the text regardless of permissions
 665          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 666          *   to the $audience parameter
 667          * @return string|bool The text of the current revision
 668          * @deprecated since 1.21, getContent() should be used instead.
 669          */
 670         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 671                 ContentHandler::deprecated( __METHOD__, '1.21' );
 672
 673                 $this->loadLastEdit();
 674                 if ( $this->mLastRevision ) {
 675                         return $this->mLastRevision->getText( $audience, $user );
 676                 }
 677                 return false;
 678         }
 679
 680         /**
 681          * @return string MW timestamp of last article revision
 682          */
 683         public function getTimestamp() {
 684                 // Check if the field has been filled by WikiPage::setTimestamp()
 685                 if ( !$this->mTimestamp ) {
 686                         $this->loadLastEdit();
 687                 }
 688
 689                 return wfTimestamp( TS_MW, $this->mTimestamp );
 690         }
 691
 692         /**
 693          * Set the page timestamp (use only to avoid DB queries)
 694          * @param string $ts MW timestamp of last article revision
 695          * @return void
 696          */
 697         public function setTimestamp( $ts ) {
 698                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 699         }
 700
 701         /**
 702          * @param int $audience One of:
 703          *   Revision::FOR_PUBLIC       to be displayed to all users
 704          *   Revision::FOR_THIS_USER    to be displayed to the given user
 705          *   Revision::RAW              get the text regardless of permissions
 706          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 707          *   to the $audience parameter
 708          * @return int User ID for the user that made the last article revision
 709          */
 710         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 711                 $this->loadLastEdit();
 712                 if ( $this->mLastRevision ) {
 713                         return $this->mLastRevision->getUser( $audience, $user );
 714                 } else {
 715                         return -1;
 716                 }
 717         }
 718
 719         /**
 720          * Get the User object of the user who created the page
 721          * @param int $audience One of:
 722          *   Revision::FOR_PUBLIC       to be displayed to all users
 723          *   Revision::FOR_THIS_USER    to be displayed to the given user
 724          *   Revision::RAW              get the text regardless of permissions
 725          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 726          *   to the $audience parameter
 727          * @return User|null
 728          */
 729         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 730                 $revision = $this->getOldestRevision();
 731                 if ( $revision ) {
 732                         $userName = $revision->getUserText( $audience, $user );
 733                         return User::newFromName( $userName, false );
 734                 } else {
 735                         return null;
 736                 }
 737         }
 738
 739         /**
 740          * @param int $audience One of:
 741          *   Revision::FOR_PUBLIC       to be displayed to all users
 742          *   Revision::FOR_THIS_USER    to be displayed to the given user
 743          *   Revision::RAW              get the text regardless of permissions
 744          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 745          *   to the $audience parameter
 746          * @return string Username of the user that made the last article revision
 747          */
 748         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 749                 $this->loadLastEdit();
 750                 if ( $this->mLastRevision ) {
 751                         return $this->mLastRevision->getUserText( $audience, $user );
 752                 } else {
 753                         return '';
 754                 }
 755         }
 756
 757         /**
 758          * @param int $audience One of:
 759          *   Revision::FOR_PUBLIC       to be displayed to all users
 760          *   Revision::FOR_THIS_USER    to be displayed to the given user
 761          *   Revision::RAW              get the text regardless of permissions
 762          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 763          *   to the $audience parameter
 764          * @return string Comment stored for the last article revision
 765          */
 766         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 767                 $this->loadLastEdit();
 768                 if ( $this->mLastRevision ) {
 769                         return $this->mLastRevision->getComment( $audience, $user );
 770                 } else {
 771                         return '';
 772                 }
 773         }
 774
 775         /**
 776          * Returns true if last revision was marked as "minor edit"
 777          *
 778          * @return bool Minor edit indicator for the last article revision.
 779          */
 780         public function getMinorEdit() {
 781                 $this->loadLastEdit();
 782                 if ( $this->mLastRevision ) {
 783                         return $this->mLastRevision->isMinor();
 784                 } else {
 785                         return false;
 786                 }
 787         }
 788
 789         /**
 790          * Determine whether a page would be suitable for being counted as an
 791          * article in the site_stats table based on the title & its content
 792          *
 793          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 794          *   if false, the current database state will be used
 795          * @return bool
 796          */
 797         public function isCountable( $editInfo = false ) {
 798                 global $wgArticleCountMethod;
 799
 800                 if ( !$this->mTitle->isContentPage() ) {
 801                         return false;
 802                 }
 803
 804                 if ( $editInfo ) {
 805                         $content = $editInfo->pstContent;
 806                 } else {
 807                         $content = $this->getContent();
 808                 }
 809
 810                 if ( !$content || $content->isRedirect() ) {
 811                         return false;
 812                 }
 813
 814                 $hasLinks = null;
 815
 816                 if ( $wgArticleCountMethod === 'link' ) {
 817                         // nasty special case to avoid re-parsing to detect links
 818
 819                         if ( $editInfo ) {
 820                                 // ParserOutput::getLinks() is a 2D array of page links, so
 821                                 // to be really correct we would need to recurse in the array
 822                                 // but the main array should only have items in it if there are
 823                                 // links.
 824                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 825                         } else {
 826                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 827                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 828                         }
 829                 }
 830
 831                 return $content->isCountable( $hasLinks );
 832         }
 833
 834         /**
 835          * If this page is a redirect, get its target
 836          *
 837          * The target will be fetched from the redirect table if possible.
 838          * If this page doesn't have an entry there, call insertRedirect()
 839          * @return Title|null Title object, or null if this page is not a redirect
 840          */
 841         public function getRedirectTarget() {
 842                 if ( !$this->mTitle->isRedirect() ) {
 843                         return null;
 844                 }
 845
 846                 if ( $this->mRedirectTarget !== null ) {
 847                         return $this->mRedirectTarget;
 848                 }
 849
 850                 // Query the redirect table
 851                 $dbr = wfGetDB( DB_SLAVE );
 852                 $row = $dbr->selectRow( 'redirect',
 853                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 854                         [ 'rd_from' => $this->getId() ],
 855                         __METHOD__
 856                 );
 857
 858                 // rd_fragment and rd_interwiki were added later, populate them if empty
 859                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 860                         $this->mRedirectTarget = Title::makeTitle(
 861                                 $row->rd_namespace, $row->rd_title,
 862                                 $row->rd_fragment, $row->rd_interwiki
 863                         );
 864                         return $this->mRedirectTarget;
 865                 }
 866
 867                 // This page doesn't have an entry in the redirect table
 868                 $this->mRedirectTarget = $this->insertRedirect();
 869                 return $this->mRedirectTarget;
 870         }
 871
 872         /**
 873          * Insert an entry for this page into the redirect table if the content is a redirect
 874          *
 875          * The database update will be deferred via DeferredUpdates
 876          *
 877          * Don't call this function directly unless you know what you're doing.
 878          * @return Title|null Title object or null if not a redirect
 879          */
 880         public function insertRedirect() {
 881                 $content = $this->getContent();
 882                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 883                 if ( !$retval ) {
 884                         return null;
 885                 }
 886
 887                 // Update the DB post-send if the page has not cached since now
 888                 $that = $this;
 889                 $latest = $this->getLatest();
 890                 DeferredUpdates::addCallableUpdate( function() use ( $that, $retval, $latest ) {
 891                         $that->insertRedirectEntry( $retval, $latest );
 892                 } );
 893
 894                 return $retval;
 895         }
 896
 897         /**
 898          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 899          * @param Title $rt Redirect target
 900          * @param int|null $oldLatest Prior page_latest for check and set
 901          */
 902         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 903                 $dbw = wfGetDB( DB_MASTER );
 904                 $dbw->startAtomic( __METHOD__ );
 905
 906                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 907                         $dbw->replace( 'redirect',
 908                                 [ 'rd_from' ],
 909                                 [
 910                                         'rd_from' => $this->getId(),
 911                                         'rd_namespace' => $rt->getNamespace(),
 912                                         'rd_title' => $rt->getDBkey(),
 913                                         'rd_fragment' => $rt->getFragment(),
 914                                         'rd_interwiki' => $rt->getInterwiki(),
 915                                 ],
 916                                 __METHOD__
 917                         );
 918                 }
 919
 920                 $dbw->endAtomic( __METHOD__ );
 921         }
 922
 923         /**
 924          * Get the Title object or URL this page redirects to
 925          *
 926          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 927          */
 928         public function followRedirect() {
 929                 return $this->getRedirectURL( $this->getRedirectTarget() );
 930         }
 931
 932         /**
 933          * Get the Title object or URL to use for a redirect. We use Title
 934          * objects for same-wiki, non-special redirects and URLs for everything
 935          * else.
 936          * @param Title $rt Redirect target
 937          * @return bool|Title|string False, Title object of local target, or string with URL
 938          */
 939         public function getRedirectURL( $rt ) {
 940                 if ( !$rt ) {
 941                         return false;
 942                 }
 943
 944                 if ( $rt->isExternal() ) {
 945                         if ( $rt->isLocal() ) {
 946                                 // Offsite wikis need an HTTP redirect.
 947                                 // This can be hard to reverse and may produce loops,
 948                                 // so they may be disabled in the site configuration.
 949                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 950                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 951                         } else {
 952                                 // External pages without "local" bit set are not valid
 953                                 // redirect targets
 954                                 return false;
 955                         }
 956                 }
 957
 958                 if ( $rt->isSpecialPage() ) {
 959                         // Gotta handle redirects to special pages differently:
 960                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 961                         // Some pages are not valid targets.
 962                         if ( $rt->isValidRedirectTarget() ) {
 963                                 return $rt->getFullURL();
 964                         } else {
 965                                 return false;
 966                         }
 967                 }
 968
 969                 return $rt;
 970         }
 971
 972         /**
 973          * Get a list of users who have edited this article, not including the user who made
 974          * the most recent revision, which you can get from $article->getUser() if you want it
 975          * @return UserArrayFromResult
 976          */
 977         public function getContributors() {
 978                 // @todo FIXME: This is expensive; cache this info somewhere.
 979
 980                 $dbr = wfGetDB( DB_SLAVE );
 981
 982                 if ( $dbr->implicitGroupby() ) {
 983                         $realNameField = 'user_real_name';
 984                 } else {
 985                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 986                 }
 987
 988                 $tables = [ 'revision', 'user' ];
 989
 990                 $fields = [
 991                         'user_id' => 'rev_user',
 992                         'user_name' => 'rev_user_text',
 993                         $realNameField,
 994                         'timestamp' => 'MAX(rev_timestamp)',
 995                 ];
 996
 997                 $conds = [ 'rev_page' => $this->getId() ];
 998
 999                 // The user who made the top revision gets credited as "this page was last edited by
1000                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1001                 $user = $this->getUser();
1002                 if ( $user ) {
1003                         $conds[] = "rev_user != $user";
1004                 } else {
1005                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1006                 }
1007
1008                 // Username hidden?
1009                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1010
1011                 $jconds = [
1012                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1013                 ];
1014
1015                 $options = [
1016                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1017                         'ORDER BY' => 'timestamp DESC',
1018                 ];
1019
1020                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1021                 return new UserArrayFromResult( $res );
1022         }
1023
1024         /**
1025          * Should the parser cache be used?
1026          *
1027          * @param ParserOptions $parserOptions ParserOptions to check
1028          * @param int $oldId
1029          * @return bool
1030          */
1031         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1032                 return $parserOptions->getStubThreshold() == 0
1033                         && $this->exists()
1034                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1035                         && $this->getContentHandler()->isParserCacheSupported();
1036         }
1037
1038         /**
1039          * Get a ParserOutput for the given ParserOptions and revision ID.
1040          *
1041          * The parser cache will be used if possible. Cache misses that result
1042          * in parser runs are debounced with PoolCounter.
1043          *
1044          * @since 1.19
1045          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1046          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1047          *                             get the current revision (default value)
1048          * @param bool          $forceParse Force reindexing, regardless of cache settings
1049          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1050          */
1051         public function getParserOutput( ParserOptions $parserOptions, $oldid = null,
1052                                          $forceParse = false ) {
1053
1054                 $useParserCache =
1055                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1056                 wfDebug( __METHOD__ .
1057                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1058                 if ( $parserOptions->getStubThreshold() ) {
1059                         wfIncrStats( 'pcache.miss.stub' );
1060                 }
1061
1062                 if ( $useParserCache ) {
1063                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1064                         if ( $parserOutput !== false ) {
1065                                 return $parserOutput;
1066                         }
1067                 }
1068
1069                 if ( $oldid === null || $oldid === 0 ) {
1070                         $oldid = $this->getLatest();
1071                 }
1072
1073                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1074                 $pool->execute();
1075
1076                 return $pool->getParserOutput();
1077         }
1078
1079         /**
1080          * Do standard deferred updates after page view (existing or missing page)
1081          * @param User $user The relevant user
1082          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1083          */
1084         public function doViewUpdates( User $user, $oldid = 0 ) {
1085                 if ( wfReadOnly() ) {
1086                         return;
1087                 }
1088
1089                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1090                 // Update newtalk / watchlist notification status
1091                 try {
1092                         $user->clearNotification( $this->mTitle, $oldid );
1093                 } catch ( DBError $e ) {
1094                         // Avoid outage if the master is not reachable
1095                         MWExceptionHandler::logException( $e );
1096                 }
1097         }
1098
1099         /**
1100          * Perform the actions of a page purging
1101          * @return bool
1102          */
1103         public function doPurge() {
1104                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1105                         return false;
1106                 }
1107
1108                 $this->mTitle->invalidateCache();
1109                 // Send purge after above page_touched update was committed
1110                 DeferredUpdates::addUpdate(
1111                         new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1112                         DeferredUpdates::PRESEND
1113                 );
1114
1115                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1116                         // @todo move this logic to MessageCache
1117                         if ( $this->exists() ) {
1118                                 // NOTE: use transclusion text for messages.
1119                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1120
1121                                 $content = $this->getContent();
1122                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1123
1124                                 if ( $text === null ) {
1125                                         $text = false;
1126                                 }
1127                         } else {
1128                                 $text = false;
1129                         }
1130
1131                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1132                 }
1133
1134                 return true;
1135         }
1136
1137         /**
1138          * Insert a new empty page record for this article.
1139          * This *must* be followed up by creating a revision
1140          * and running $this->updateRevisionOn( ... );
1141          * or else the record will be left in a funky state.
1142          * Best if all done inside a transaction.
1143          *
1144          * @param IDatabase $dbw
1145          * @param int|null $pageId Custom page ID that will be used for the insert statement
1146          *
1147          * @return bool|int The newly created page_id key; false if the row was not
1148          *   inserted, e.g. because the title already existed or because the specified
1149          *   page ID is already in use.
1150          */
1151         public function insertOn( $dbw, $pageId = null ) {
1152                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1153                 $dbw->insert(
1154                         'page',
1155                         [
1156                                 'page_id'           => $pageIdForInsert,
1157                                 'page_namespace'    => $this->mTitle->getNamespace(),
1158                                 'page_title'        => $this->mTitle->getDBkey(),
1159                                 'page_restrictions' => '',
1160                                 'page_is_redirect'  => 0, // Will set this shortly...
1161                                 'page_is_new'       => 1,
1162                                 'page_random'       => wfRandom(),
1163                                 'page_touched'      => $dbw->timestamp(),
1164                                 'page_latest'       => 0, // Fill this in shortly...
1165                                 'page_len'          => 0, // Fill this in shortly...
1166                         ],
1167                         __METHOD__,
1168                         'IGNORE'
1169                 );
1170
1171                 if ( $dbw->affectedRows() > 0 ) {
1172                         $newid = $pageId ?: $dbw->insertId();
1173                         $this->mId = $newid;
1174                         $this->mTitle->resetArticleID( $newid );
1175
1176                         return $newid;
1177                 } else {
1178                         return false; // nothing changed
1179                 }
1180         }
1181
1182         /**
1183          * Update the page record to point to a newly saved revision.
1184          *
1185          * @param IDatabase $dbw
1186          * @param Revision $revision For ID number, and text used to set
1187          *   length and redirect status fields
1188          * @param int $lastRevision If given, will not overwrite the page field
1189          *   when different from the currently set value.
1190          *   Giving 0 indicates the new page flag should be set on.
1191          * @param bool $lastRevIsRedirect If given, will optimize adding and
1192          *   removing rows in redirect table.
1193          * @return bool Success; false if the page row was missing or page_latest changed
1194          */
1195         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1196                 $lastRevIsRedirect = null
1197         ) {
1198                 global $wgContentHandlerUseDB;
1199
1200                 // Assertion to try to catch T92046
1201                 if ( (int)$revision->getId() === 0 ) {
1202                         throw new InvalidArgumentException(
1203                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1204                         );
1205                 }
1206
1207                 $content = $revision->getContent();
1208                 $len = $content ? $content->getSize() : 0;
1209                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1210
1211                 $conditions = [ 'page_id' => $this->getId() ];
1212
1213                 if ( !is_null( $lastRevision ) ) {
1214                         // An extra check against threads stepping on each other
1215                         $conditions['page_latest'] = $lastRevision;
1216                 }
1217
1218                 $row = [ /* SET */
1219                         'page_latest'      => $revision->getId(),
1220                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1221                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1222                         'page_is_redirect' => $rt !== null ? 1 : 0,
1223                         'page_len'         => $len,
1224                 ];
1225
1226                 if ( $wgContentHandlerUseDB ) {
1227                         $row['page_content_model'] = $revision->getContentModel();
1228                 }
1229
1230                 $dbw->update( 'page',
1231                         $row,
1232                         $conditions,
1233                         __METHOD__ );
1234
1235                 $result = $dbw->affectedRows() > 0;
1236                 if ( $result ) {
1237                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1238                         $this->setLastEdit( $revision );
1239                         $this->mLatest = $revision->getId();
1240                         $this->mIsRedirect = (bool)$rt;
1241                         // Update the LinkCache.
1242                         LinkCache::singleton()->addGoodLinkObj(
1243                                 $this->getId(),
1244                                 $this->mTitle,
1245                                 $len,
1246                                 $this->mIsRedirect,
1247                                 $this->mLatest,
1248                                 $revision->getContentModel()
1249                         );
1250                 }
1251
1252                 return $result;
1253         }
1254
1255         /**
1256          * Add row to the redirect table if this is a redirect, remove otherwise.
1257          *
1258          * @param IDatabase $dbw
1259          * @param Title $redirectTitle Title object pointing to the redirect target,
1260          *   or NULL if this is not a redirect
1261          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1262          *   removing rows in redirect table.
1263          * @return bool True on success, false on failure
1264          * @private
1265          */
1266         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1267                 // Always update redirects (target link might have changed)
1268                 // Update/Insert if we don't know if the last revision was a redirect or not
1269                 // Delete if changing from redirect to non-redirect
1270                 $isRedirect = !is_null( $redirectTitle );
1271
1272                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1273                         return true;
1274                 }
1275
1276                 if ( $isRedirect ) {
1277                         $this->insertRedirectEntry( $redirectTitle );
1278                 } else {
1279                         // This is not a redirect, remove row from redirect table
1280                         $where = [ 'rd_from' => $this->getId() ];
1281                         $dbw->delete( 'redirect', $where, __METHOD__ );
1282                 }
1283
1284                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1285                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1286                 }
1287
1288                 return ( $dbw->affectedRows() != 0 );
1289         }
1290
1291         /**
1292          * If the given revision is newer than the currently set page_latest,
1293          * update the page record. Otherwise, do nothing.
1294          *
1295          * @deprecated since 1.24, use updateRevisionOn instead
1296          *
1297          * @param IDatabase $dbw
1298          * @param Revision $revision
1299          * @return bool
1300          */
1301         public function updateIfNewerOn( $dbw, $revision ) {
1302
1303                 $row = $dbw->selectRow(
1304                         [ 'revision', 'page' ],
1305                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1306                         [
1307                                 'page_id' => $this->getId(),
1308                                 'page_latest=rev_id' ],
1309                         __METHOD__ );
1310
1311                 if ( $row ) {
1312                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1313                                 return false;
1314                         }
1315                         $prev = $row->rev_id;
1316                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1317                 } else {
1318                         // No or missing previous revision; mark the page as new
1319                         $prev = 0;
1320                         $lastRevIsRedirect = null;
1321                 }
1322
1323                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1324
1325                 return $ret;
1326         }
1327
1328         /**
1329          * Get the content that needs to be saved in order to undo all revisions
1330          * between $undo and $undoafter. Revisions must belong to the same page,
1331          * must exist and must not be deleted
1332          * @param Revision $undo
1333          * @param Revision $undoafter Must be an earlier revision than $undo
1334          * @return Content|bool Content on success, false on failure
1335          * @since 1.21
1336          * Before we had the Content object, this was done in getUndoText
1337          */
1338         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1339                 $handler = $undo->getContentHandler();
1340                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1341         }
1342
1343         /**
1344          * Returns true if this page's content model supports sections.
1345          *
1346          * @return bool
1347          *
1348          * @todo The skin should check this and not offer section functionality if
1349          *   sections are not supported.
1350          * @todo The EditPage should check this and not offer section functionality
1351          *   if sections are not supported.
1352          */
1353         public function supportsSections() {
1354                 return $this->getContentHandler()->supportsSections();
1355         }
1356
1357         /**
1358          * @param string|number|null|bool $sectionId Section identifier as a number or string
1359          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1360          * or 'new' for a new section.
1361          * @param Content $sectionContent New content of the section.
1362          * @param string $sectionTitle New section's subject, only if $section is "new".
1363          * @param string $edittime Revision timestamp or null to use the current revision.
1364          *
1365          * @throws MWException
1366          * @return Content|null New complete article content, or null if error.
1367          *
1368          * @since 1.21
1369          * @deprecated since 1.24, use replaceSectionAtRev instead
1370          */
1371         public function replaceSectionContent(
1372                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1373         ) {
1374
1375                 $baseRevId = null;
1376                 if ( $edittime && $sectionId !== 'new' ) {
1377                         $dbr = wfGetDB( DB_SLAVE );
1378                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1379                         // Try the master if this thread may have just added it.
1380                         // This could be abstracted into a Revision method, but we don't want
1381                         // to encourage loading of revisions by timestamp.
1382                         if ( !$rev
1383                                 && wfGetLB()->getServerCount() > 1
1384                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1385                         ) {
1386                                 $dbw = wfGetDB( DB_MASTER );
1387                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1388                         }
1389                         if ( $rev ) {
1390                                 $baseRevId = $rev->getId();
1391                         }
1392                 }
1393
1394                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1395         }
1396
1397         /**
1398          * @param string|number|null|bool $sectionId Section identifier as a number or string
1399          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1400          * or 'new' for a new section.
1401          * @param Content $sectionContent New content of the section.
1402          * @param string $sectionTitle New section's subject, only if $section is "new".
1403          * @param int|null $baseRevId
1404          *
1405          * @throws MWException
1406          * @return Content|null New complete article content, or null if error.
1407          *
1408          * @since 1.24
1409          */
1410         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1411                 $sectionTitle = '', $baseRevId = null
1412         ) {
1413
1414                 if ( strval( $sectionId ) === '' ) {
1415                         // Whole-page edit; let the whole text through
1416                         $newContent = $sectionContent;
1417                 } else {
1418                         if ( !$this->supportsSections() ) {
1419                                 throw new MWException( "sections not supported for content model " .
1420                                         $this->getContentHandler()->getModelID() );
1421                         }
1422
1423                         // Bug 30711: always use current version when adding a new section
1424                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1425                                 $oldContent = $this->getContent();
1426                         } else {
1427                                 $rev = Revision::newFromId( $baseRevId );
1428                                 if ( !$rev ) {
1429                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1430                                                 $this->getId() . "; section: $sectionId)\n" );
1431                                         return null;
1432                                 }
1433
1434                                 $oldContent = $rev->getContent();
1435                         }
1436
1437                         if ( !$oldContent ) {
1438                                 wfDebug( __METHOD__ . ": no page text\n" );
1439                                 return null;
1440                         }
1441
1442                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1443                 }
1444
1445                 return $newContent;
1446         }
1447
1448         /**
1449          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1450          * @param int $flags
1451          * @return int Updated $flags
1452          */
1453         public function checkFlags( $flags ) {
1454                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1455                         if ( $this->exists() ) {
1456                                 $flags |= EDIT_UPDATE;
1457                         } else {
1458                                 $flags |= EDIT_NEW;
1459                         }
1460                 }
1461
1462                 return $flags;
1463         }
1464
1465         /**
1466          * Change an existing article or create a new article. Updates RC and all necessary caches,
1467          * optionally via the deferred update array.
1468          *
1469          * @param string $text New text
1470          * @param string $summary Edit summary
1471          * @param int $flags Bitfield:
1472          *      EDIT_NEW
1473          *          Article is known or assumed to be non-existent, create a new one
1474          *      EDIT_UPDATE
1475          *          Article is known or assumed to be pre-existing, update it
1476          *      EDIT_MINOR
1477          *          Mark this edit minor, if the user is allowed to do so
1478          *      EDIT_SUPPRESS_RC
1479          *          Do not log the change in recentchanges
1480          *      EDIT_FORCE_BOT
1481          *          Mark the edit a "bot" edit regardless of user rights
1482          *      EDIT_AUTOSUMMARY
1483          *          Fill in blank summaries with generated text where possible
1484          *      EDIT_INTERNAL
1485          *          Signal that the page retrieve/save cycle happened entirely in this request.
1486          *
1487          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1488          * article will be detected. If EDIT_UPDATE is specified and the article
1489          * doesn't exist, the function will return an edit-gone-missing error. If
1490          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1491          * error will be returned. These two conditions are also possible with
1492          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1493          *
1494          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1495          *   This is not the parent revision ID, rather the revision ID for older
1496          *   content used as the source for a rollback, for example.
1497          * @param User $user The user doing the edit
1498          *
1499          * @throws MWException
1500          * @return Status Possible errors:
1501          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1502          *     set the fatal flag of $status
1503          *   edit-gone-missing: In update mode, but the article didn't exist.
1504          *   edit-conflict: In update mode, the article changed unexpectedly.
1505          *   edit-no-change: Warning that the text was the same as before.
1506          *   edit-already-exists: In creation mode, but the article already exists.
1507          *
1508          * Extensions may define additional errors.
1509          *
1510          * $return->value will contain an associative array with members as follows:
1511          *     new: Boolean indicating if the function attempted to create a new article.
1512          *     revision: The revision object for the inserted revision, or null.
1513          *
1514          * Compatibility note: this function previously returned a boolean value
1515          * indicating success/failure
1516          *
1517          * @deprecated since 1.21: use doEditContent() instead.
1518          */
1519         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1520                 ContentHandler::deprecated( __METHOD__, '1.21' );
1521
1522                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1523
1524                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1525         }
1526
1527         /**
1528          * Change an existing article or create a new article. Updates RC and all necessary caches,
1529          * optionally via the deferred update array.
1530          *
1531          * @param Content $content New content
1532          * @param string $summary Edit summary
1533          * @param int $flags Bitfield:
1534          *      EDIT_NEW
1535          *          Article is known or assumed to be non-existent, create a new one
1536          *      EDIT_UPDATE
1537          *          Article is known or assumed to be pre-existing, update it
1538          *      EDIT_MINOR
1539          *          Mark this edit minor, if the user is allowed to do so
1540          *      EDIT_SUPPRESS_RC
1541          *          Do not log the change in recentchanges
1542          *      EDIT_FORCE_BOT
1543          *          Mark the edit a "bot" edit regardless of user rights
1544          *      EDIT_AUTOSUMMARY
1545          *          Fill in blank summaries with generated text where possible
1546          *      EDIT_INTERNAL
1547          *          Signal that the page retrieve/save cycle happened entirely in this request.
1548          *
1549          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1550          * article will be detected. If EDIT_UPDATE is specified and the article
1551          * doesn't exist, the function will return an edit-gone-missing error. If
1552          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1553          * error will be returned. These two conditions are also possible with
1554          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1555          *
1556          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1557          *   This is not the parent revision ID, rather the revision ID for older
1558          *   content used as the source for a rollback, for example.
1559          * @param User $user The user doing the edit
1560          * @param string $serialFormat Format for storing the content in the
1561          *   database.
1562          * @param array|null $tags Change tags to apply to this edit
1563          * Callers are responsible for permission checks
1564          * (with ChangeTags::canAddTagsAccompanyingChange)
1565          *
1566          * @throws MWException
1567          * @return Status Possible errors:
1568          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1569          *       set the fatal flag of $status.
1570          *     edit-gone-missing: In update mode, but the article didn't exist.
1571          *     edit-conflict: In update mode, the article changed unexpectedly.
1572          *     edit-no-change: Warning that the text was the same as before.
1573          *     edit-already-exists: In creation mode, but the article already exists.
1574          *
1575          *  Extensions may define additional errors.
1576          *
1577          *  $return->value will contain an associative array with members as follows:
1578          *     new: Boolean indicating if the function attempted to create a new article.
1579          *     revision: The revision object for the inserted revision, or null.
1580          *
1581          * @since 1.21
1582          * @throws MWException
1583          */
1584         public function doEditContent(
1585                 Content $content, $summary, $flags = 0, $baseRevId = false,
1586                 User $user = null, $serialFormat = null, $tags = null
1587         ) {
1588                 global $wgUser, $wgUseAutomaticEditSummaries;
1589
1590                 // Low-level sanity check
1591                 if ( $this->mTitle->getText() === '' ) {
1592                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1593                 }
1594                 // Make sure the given content type is allowed for this page
1595                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1596                         return Status::newFatal( 'content-not-allowed-here',
1597                                 ContentHandler::getLocalizedName( $content->getModel() ),
1598                                 $this->mTitle->getPrefixedText()
1599                         );
1600                 }
1601
1602                 // Load the data from the master database if needed.
1603                 // The caller may already loaded it from the master or even loaded it using
1604                 // SELECT FOR UPDATE, so do not override that using clear().
1605                 $this->loadPageData( 'fromdbmaster' );
1606
1607                 $user = $user ?: $wgUser;
1608                 $flags = $this->checkFlags( $flags );
1609
1610                 // Trigger pre-save hook (using provided edit summary)
1611                 $hookStatus = Status::newGood( [] );
1612                 $hook_args = [ &$this, &$user, &$content, &$summary,
1613                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1614                 // Check if the hook rejected the attempted save
1615                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1616                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1617                 ) {
1618                         if ( $hookStatus->isOK() ) {
1619                                 // Hook returned false but didn't call fatal(); use generic message
1620                                 $hookStatus->fatal( 'edit-hook-aborted' );
1621                         }
1622
1623                         return $hookStatus;
1624                 }
1625
1626                 $old_revision = $this->getRevision(); // current revision
1627                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1628
1629                 // Provide autosummaries if one is not provided and autosummaries are enabled
1630                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1631                         $handler = $content->getContentHandler();
1632                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1633                 }
1634
1635                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1636                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1637                         $useCache = false;
1638                 } else {
1639                         $useCache = true;
1640                 }
1641
1642                 // Get the pre-save transform content and final parser output
1643                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1644                 $pstContent = $editInfo->pstContent; // Content object
1645                 $meta = [
1646                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1647                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1648                         'serialized' => $editInfo->pst,
1649                         'serialFormat' => $serialFormat,
1650                         'baseRevId' => $baseRevId,
1651                         'oldRevision' => $old_revision,
1652                         'oldContent' => $old_content,
1653                         'oldId' => $this->getLatest(),
1654                         'oldIsRedirect' => $this->isRedirect(),
1655                         'oldCountable' => $this->isCountable(),
1656                         'tags' => ( $tags !== null ) ? (array)$tags : []
1657                 ];
1658
1659                 // Actually create the revision and create/update the page
1660                 if ( $flags & EDIT_UPDATE ) {
1661                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1662                 } else {
1663                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1664                 }
1665
1666                 // Promote user to any groups they meet the criteria for
1667                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1668                         $user->addAutopromoteOnceGroups( 'onEdit' );
1669                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1670                 } );
1671
1672                 return $status;
1673         }
1674
1675         /**
1676          * @param Content $content Pre-save transform content
1677          * @param integer $flags
1678          * @param User $user
1679          * @param string $summary
1680          * @param array $meta
1681          * @return Status
1682          * @throws DBUnexpectedError
1683          * @throws Exception
1684          * @throws FatalError
1685          * @throws MWException
1686          */
1687         private function doModify(
1688                 Content $content, $flags, User $user, $summary, array $meta
1689         ) {
1690                 global $wgUseRCPatrol;
1691
1692                 // Update article, but only if changed.
1693                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1694
1695                 // Convenience variables
1696                 $now = wfTimestampNow();
1697                 $oldid = $meta['oldId'];
1698                 /** @var $oldContent Content|null */
1699                 $oldContent = $meta['oldContent'];
1700                 $newsize = $content->getSize();
1701
1702                 if ( !$oldid ) {
1703                         // Article gone missing
1704                         $status->fatal( 'edit-gone-missing' );
1705
1706                         return $status;
1707                 } elseif ( !$oldContent ) {
1708                         // Sanity check for bug 37225
1709                         throw new MWException( "Could not find text for current revision {$oldid}." );
1710                 }
1711
1712                 // @TODO: pass content object?!
1713                 $revision = new Revision( [
1714                         'page'       => $this->getId(),
1715                         'title'      => $this->mTitle, // for determining the default content model
1716                         'comment'    => $summary,
1717                         'minor_edit' => $meta['minor'],
1718                         'text'       => $meta['serialized'],
1719                         'len'        => $newsize,
1720                         'parent_id'  => $oldid,
1721                         'user'       => $user->getId(),
1722                         'user_text'  => $user->getName(),
1723                         'timestamp'  => $now,
1724                         'content_model' => $content->getModel(),
1725                         'content_format' => $meta['serialFormat'],
1726                 ] );
1727
1728                 $changed = !$content->equals( $oldContent );
1729
1730                 $dbw = wfGetDB( DB_MASTER );
1731
1732                 if ( $changed ) {
1733                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1734                         $status->merge( $prepStatus );
1735                         if ( !$status->isOK() ) {
1736                                 return $status;
1737                         }
1738
1739                         $dbw->startAtomic( __METHOD__ );
1740                         // Get the latest page_latest value while locking it.
1741                         // Do a CAS style check to see if it's the same as when this method
1742                         // started. If it changed then bail out before touching the DB.
1743                         $latestNow = $this->lockAndGetLatest();
1744                         if ( $latestNow != $oldid ) {
1745                                 $dbw->endAtomic( __METHOD__ );
1746                                 // Page updated or deleted in the mean time
1747                                 $status->fatal( 'edit-conflict' );
1748
1749                                 return $status;
1750                         }
1751
1752                         // At this point we are now comitted to returning an OK
1753                         // status unless some DB query error or other exception comes up.
1754                         // This way callers don't have to call rollback() if $status is bad
1755                         // unless they actually try to catch exceptions (which is rare).
1756
1757                         // Save the revision text
1758                         $revisionId = $revision->insertOn( $dbw );
1759                         // Update page_latest and friends to reflect the new revision
1760                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1761                                 $dbw->rollback( __METHOD__ ); // sanity; this should never happen
1762                                 throw new MWException( "Failed to update page row to use new revision." );
1763                         }
1764
1765                         Hooks::run( 'NewRevisionFromEditComplete',
1766                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1767
1768                         // Update recentchanges
1769                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1770                                 // Mark as patrolled if the user can do so
1771                                 $patrolled = $wgUseRCPatrol && !count(
1772                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1773                                 // Add RC row to the DB
1774                                 RecentChange::notifyEdit(
1775                                         $now,
1776                                         $this->mTitle,
1777                                         $revision->isMinor(),
1778                                         $user,
1779                                         $summary,
1780                                         $oldid,
1781                                         $this->getTimestamp(),
1782                                         $meta['bot'],
1783                                         '',
1784                                         $oldContent ? $oldContent->getSize() : 0,
1785                                         $newsize,
1786                                         $revisionId,
1787                                         $patrolled,
1788                                         $meta['tags']
1789                                 );
1790                         }
1791
1792                         $user->incEditCount();
1793
1794                         $dbw->endAtomic( __METHOD__ );
1795                         $this->mTimestamp = $now;
1796                 } else {
1797                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1798                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1799                         $revision->setId( $this->getLatest() );
1800                         $revision->setUserIdAndName(
1801                                 $this->getUser( Revision::RAW ),
1802                                 $this->getUserText( Revision::RAW )
1803                         );
1804                 }
1805
1806                 if ( $changed ) {
1807                         // Return the new revision to the caller
1808                         $status->value['revision'] = $revision;
1809                 } else {
1810                         $status->warning( 'edit-no-change' );
1811                         // Update page_touched as updateRevisionOn() was not called.
1812                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1813                         $this->mTitle->invalidateCache( $now );
1814                 }
1815
1816                 // Do secondary updates once the main changes have been committed...
1817                 DeferredUpdates::addUpdate(
1818                         new AtomicSectionUpdate(
1819                                 $dbw,
1820                                 __METHOD__,
1821                                 function () use (
1822                                         $revision, &$user, $content, $summary, &$flags,
1823                                         $changed, $meta, &$status
1824                                 ) {
1825                                         // Update links tables, site stats, etc.
1826                                         $this->doEditUpdates(
1827                                                 $revision,
1828                                                 $user,
1829                                                 [
1830                                                         'changed' => $changed,
1831                                                         'oldcountable' => $meta['oldCountable'],
1832                                                         'oldrevision' => $meta['oldRevision']
1833                                                 ]
1834                                         );
1835                                         // Trigger post-save hook
1836                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1837                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1838                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1839                                         Hooks::run( 'PageContentSaveComplete', $params );
1840                                 }
1841                         ),
1842                         DeferredUpdates::PRESEND
1843                 );
1844
1845                 return $status;
1846         }
1847
1848         /**
1849          * @param Content $content Pre-save transform content
1850          * @param integer $flags
1851          * @param User $user
1852          * @param string $summary
1853          * @param array $meta
1854          * @return Status
1855          * @throws DBUnexpectedError
1856          * @throws Exception
1857          * @throws FatalError
1858          * @throws MWException
1859          */
1860         private function doCreate(
1861                 Content $content, $flags, User $user, $summary, array $meta
1862         ) {
1863                 global $wgUseRCPatrol, $wgUseNPPatrol;
1864
1865                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1866
1867                 $now = wfTimestampNow();
1868                 $newsize = $content->getSize();
1869                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1870                 $status->merge( $prepStatus );
1871                 if ( !$status->isOK() ) {
1872                         return $status;
1873                 }
1874
1875                 $dbw = wfGetDB( DB_MASTER );
1876                 $dbw->startAtomic( __METHOD__ );
1877
1878                 // Add the page record unless one already exists for the title
1879                 $newid = $this->insertOn( $dbw );
1880                 if ( $newid === false ) {
1881                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1882                         $status->fatal( 'edit-already-exists' );
1883
1884                         return $status; // nothing done
1885                 }
1886
1887                 // At this point we are now comitted to returning an OK
1888                 // status unless some DB query error or other exception comes up.
1889                 // This way callers don't have to call rollback() if $status is bad
1890                 // unless they actually try to catch exceptions (which is rare).
1891
1892                 // @TODO: pass content object?!
1893                 $revision = new Revision( [
1894                         'page'       => $newid,
1895                         'title'      => $this->mTitle, // for determining the default content model
1896                         'comment'    => $summary,
1897                         'minor_edit' => $meta['minor'],
1898                         'text'       => $meta['serialized'],
1899                         'len'        => $newsize,
1900                         'user'       => $user->getId(),
1901                         'user_text'  => $user->getName(),
1902                         'timestamp'  => $now,
1903                         'content_model' => $content->getModel(),
1904                         'content_format' => $meta['serialFormat'],
1905                 ] );
1906
1907                 // Save the revision text...
1908                 $revisionId = $revision->insertOn( $dbw );
1909                 // Update the page record with revision data
1910                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1911                         $dbw->rollback( __METHOD__ ); // sanity; this should never happen
1912                         throw new MWException( "Failed to update page row to use new revision." );
1913                 }
1914
1915                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1916
1917                 // Update recentchanges
1918                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1919                         // Mark as patrolled if the user can do so
1920                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1921                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1922                         // Add RC row to the DB
1923                         RecentChange::notifyNew(
1924                                 $now,
1925                                 $this->mTitle,
1926                                 $revision->isMinor(),
1927                                 $user,
1928                                 $summary,
1929                                 $meta['bot'],
1930                                 '',
1931                                 $newsize,
1932                                 $revisionId,
1933                                 $patrolled,
1934                                 $meta['tags']
1935                         );
1936                 }
1937
1938                 $user->incEditCount();
1939
1940                 $dbw->endAtomic( __METHOD__ );
1941                 $this->mTimestamp = $now;
1942
1943                 // Return the new revision to the caller
1944                 $status->value['revision'] = $revision;
1945
1946                 // Do secondary updates once the main changes have been committed...
1947                 DeferredUpdates::addUpdate(
1948                         new AtomicSectionUpdate(
1949                                 $dbw,
1950                                 __METHOD__,
1951                                 function () use (
1952                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1953                                 ) {
1954                                         // Update links, etc.
1955                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1956                                         // Trigger post-create hook
1957                                         $params = [ &$this, &$user, $content, $summary,
1958                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1959                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
1960                                         Hooks::run( 'PageContentInsertComplete', $params );
1961                                         // Trigger post-save hook
1962                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
1963                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1964                                         Hooks::run( 'PageContentSaveComplete', $params );
1965
1966                                 }
1967                         ),
1968                         DeferredUpdates::PRESEND
1969                 );
1970
1971                 return $status;
1972         }
1973
1974         /**
1975          * Get parser options suitable for rendering the primary article wikitext
1976          *
1977          * @see ContentHandler::makeParserOptions
1978          *
1979          * @param IContextSource|User|string $context One of the following:
1980          *        - IContextSource: Use the User and the Language of the provided
1981          *          context
1982          *        - User: Use the provided User object and $wgLang for the language,
1983          *          so use an IContextSource object if possible.
1984          *        - 'canonical': Canonical options (anonymous user with default
1985          *          preferences and content language).
1986          * @return ParserOptions
1987          */
1988         public function makeParserOptions( $context ) {
1989                 $options = $this->getContentHandler()->makeParserOptions( $context );
1990
1991                 if ( $this->getTitle()->isConversionTable() ) {
1992                         // @todo ConversionTable should become a separate content model, so
1993                         // we don't need special cases like this one.
1994                         $options->disableContentConversion();
1995                 }
1996
1997                 return $options;
1998         }
1999
2000         /**
2001          * Prepare text which is about to be saved.
2002          * Returns a stdClass with source, pst and output members
2003          *
2004          * @param string $text
2005          * @param int|null $revid
2006          * @param User|null $user
2007          * @deprecated since 1.21: use prepareContentForEdit instead.
2008          * @return object
2009          */
2010         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2011                 ContentHandler::deprecated( __METHOD__, '1.21' );
2012                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2013                 return $this->prepareContentForEdit( $content, $revid, $user );
2014         }
2015
2016         /**
2017          * Prepare content which is about to be saved.
2018          * Returns a stdClass with source, pst and output members
2019          *
2020          * @param Content $content
2021          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2022          *        revision ID is also accepted, but this is deprecated.
2023          * @param User|null $user
2024          * @param string|null $serialFormat
2025          * @param bool $useCache Check shared prepared edit cache
2026          *
2027          * @return object
2028          *
2029          * @since 1.21
2030          */
2031         public function prepareContentForEdit(
2032                 Content $content, $revision = null, User $user = null,
2033                 $serialFormat = null, $useCache = true
2034         ) {
2035                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2036
2037                 if ( is_object( $revision ) ) {
2038                         $revid = $revision->getId();
2039                 } else {
2040                         $revid = $revision;
2041                         // This code path is deprecated, and nothing is known to
2042                         // use it, so performance here shouldn't be a worry.
2043                         if ( $revid !== null ) {
2044                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2045                         } else {
2046                                 $revision = null;
2047                         }
2048                 }
2049
2050                 $user = is_null( $user ) ? $wgUser : $user;
2051                 // XXX: check $user->getId() here???
2052
2053                 // Use a sane default for $serialFormat, see bug 57026
2054                 if ( $serialFormat === null ) {
2055                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2056                 }
2057
2058                 if ( $this->mPreparedEdit
2059                         && isset( $this->mPreparedEdit->newContent )
2060                         && $this->mPreparedEdit->newContent->equals( $content )
2061                         && $this->mPreparedEdit->revid == $revid
2062                         && $this->mPreparedEdit->format == $serialFormat
2063                         // XXX: also check $user here?
2064                 ) {
2065                         // Already prepared
2066                         return $this->mPreparedEdit;
2067                 }
2068
2069                 // The edit may have already been prepared via api.php?action=stashedit
2070                 $cachedEdit = $useCache && $wgAjaxEditStash
2071                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2072                         : false;
2073
2074                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2075                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2076
2077                 $edit = (object)[];
2078                 if ( $cachedEdit ) {
2079                         $edit->timestamp = $cachedEdit->timestamp;
2080                 } else {
2081                         $edit->timestamp = wfTimestampNow();
2082                 }
2083                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2084                 $edit->revid = $revid;
2085
2086                 if ( $cachedEdit ) {
2087                         $edit->pstContent = $cachedEdit->pstContent;
2088                 } else {
2089                         $edit->pstContent = $content
2090                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2091                                 : null;
2092                 }
2093
2094                 $edit->format = $serialFormat;
2095                 $edit->popts = $this->makeParserOptions( 'canonical' );
2096                 if ( $cachedEdit ) {
2097                         $edit->output = $cachedEdit->output;
2098                 } else {
2099                         if ( $revision ) {
2100                                 // We get here if vary-revision is set. This means that this page references
2101                                 // itself (such as via self-transclusion). In this case, we need to make sure
2102                                 // that any such self-references refer to the newly-saved revision, and not
2103                                 // to the previous one, which could otherwise happen due to slave lag.
2104                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2105                                 $edit->popts->setCurrentRevisionCallback(
2106                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2107                                                 if ( $title->equals( $revision->getTitle() ) ) {
2108                                                         return $revision;
2109                                                 } else {
2110                                                         return call_user_func( $oldCallback, $title, $parser );
2111                                                 }
2112                                         }
2113                                 );
2114                         } else {
2115                                 // Try to avoid a second parse if {{REVISIONID}} is used
2116                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2117                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2118                                                 'revision',
2119                                                 'MAX(rev_id)',
2120                                                 [],
2121                                                 __METHOD__
2122                                         );
2123                                 } );
2124                         }
2125                         $edit->output = $edit->pstContent
2126                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2127                                 : null;
2128                 }
2129
2130                 $edit->newContent = $content;
2131                 $edit->oldContent = $this->getContent( Revision::RAW );
2132
2133                 // NOTE: B/C for hooks! don't use these fields!
2134                 $edit->newText = $edit->newContent
2135                         ? ContentHandler::getContentText( $edit->newContent )
2136                         : '';
2137                 $edit->oldText = $edit->oldContent
2138                         ? ContentHandler::getContentText( $edit->oldContent )
2139                         : '';
2140                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2141
2142                 if ( $edit->output ) {
2143                         $edit->output->setCacheTime( wfTimestampNow() );
2144                 }
2145
2146                 // Process cache the result
2147                 $this->mPreparedEdit = $edit;
2148
2149                 return $edit;
2150         }
2151
2152         /**
2153          * Do standard deferred updates after page edit.
2154          * Update links tables, site stats, search index and message cache.
2155          * Purges pages that include this page if the text was changed here.
2156          * Every 100th edit, prune the recent changes table.
2157          *
2158          * @param Revision $revision
2159          * @param User $user User object that did the revision
2160          * @param array $options Array of options, following indexes are used:
2161          * - changed: boolean, whether the revision changed the content (default true)
2162          * - created: boolean, whether the revision created the page (default false)
2163          * - moved: boolean, whether the page was moved (default false)
2164          * - restored: boolean, whether the page was undeleted (default false)
2165          * - oldrevision: Revision object for the pre-update revision (default null)
2166          * - oldcountable: boolean, null, or string 'no-change' (default null):
2167          *   - boolean: whether the page was counted as an article before that
2168          *     revision, only used in changed is true and created is false
2169          *   - null: if created is false, don't update the article count; if created
2170          *     is true, do update the article count
2171          *   - 'no-change': don't update the article count, ever
2172          */
2173         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2174                 global $wgRCWatchCategoryMembership, $wgContLang;
2175
2176                 $options += [
2177                         'changed' => true,
2178                         'created' => false,
2179                         'moved' => false,
2180                         'restored' => false,
2181                         'oldrevision' => null,
2182                         'oldcountable' => null
2183                 ];
2184                 $content = $revision->getContent();
2185
2186                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2187
2188                 // See if the parser output before $revision was inserted is still valid
2189                 $editInfo = false;
2190                 if ( !$this->mPreparedEdit ) {
2191                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2192                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2193                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2194                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2195                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2196                 ) {
2197                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2198                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2199                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2200                 } else {
2201                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2202                         $editInfo = $this->mPreparedEdit;
2203                 }
2204
2205                 if ( !$editInfo ) {
2206                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2207                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2208                         // as any prepared content from there or in doEditContent() was already rejected.
2209                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2210                 }
2211
2212                 // Save it to the parser cache.
2213                 // Make sure the cache time matches page_touched to avoid double parsing.
2214                 ParserCache::singleton()->save(
2215                         $editInfo->output, $this, $editInfo->popts,
2216                         $revision->getTimestamp(), $editInfo->revid
2217                 );
2218
2219                 // Update the links tables and other secondary data
2220                 if ( $content ) {
2221                         $recursive = $options['changed']; // bug 50785
2222                         $updates = $content->getSecondaryDataUpdates(
2223                                 $this->getTitle(), null, $recursive, $editInfo->output
2224                         );
2225                         foreach ( $updates as $update ) {
2226                                 if ( $update instanceof LinksUpdate ) {
2227                                         $update->setRevision( $revision );
2228                                         $update->setTriggeringUser( $user );
2229                                 }
2230                                 DeferredUpdates::addUpdate( $update );
2231                         }
2232                         if ( $wgRCWatchCategoryMembership
2233                                 && $this->getContentHandler()->supportsCategories() === true
2234                                 && ( $options['changed'] || $options['created'] )
2235                                 && !$options['restored']
2236                         ) {
2237                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2238                                 // the recent change entry (also done via deferred updates) and carry over any
2239                                 // bot/deletion/IP flags, ect.
2240                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2241                                         $this->getTitle(),
2242                                         [
2243                                                 'pageId' => $this->getId(),
2244                                                 'revTimestamp' => $revision->getTimestamp()
2245                                         ]
2246                                 ) );
2247                         }
2248                 }
2249
2250                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2251
2252                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2253                         // Flush old entries from the `recentchanges` table
2254                         if ( mt_rand( 0, 9 ) == 0 ) {
2255                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2256                         }
2257                 }
2258
2259                 if ( !$this->exists() ) {
2260                         return;
2261                 }
2262
2263                 $id = $this->getId();
2264                 $title = $this->mTitle->getPrefixedDBkey();
2265                 $shortTitle = $this->mTitle->getDBkey();
2266
2267                 if ( $options['oldcountable'] === 'no-change' ||
2268                         ( !$options['changed'] && !$options['moved'] )
2269                 ) {
2270                         $good = 0;
2271                 } elseif ( $options['created'] ) {
2272                         $good = (int)$this->isCountable( $editInfo );
2273                 } elseif ( $options['oldcountable'] !== null ) {
2274                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2275                 } else {
2276                         $good = 0;
2277                 }
2278                 $edits = $options['changed'] ? 1 : 0;
2279                 $total = $options['created'] ? 1 : 0;
2280
2281                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2282                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2283
2284                 // If this is another user's talk page, update newtalk.
2285                 // Don't do this if $options['changed'] = false (null-edits) nor if
2286                 // it's a minor edit and the user doesn't want notifications for those.
2287                 if ( $options['changed']
2288                         && $this->mTitle->getNamespace() == NS_USER_TALK
2289                         && $shortTitle != $user->getTitleKey()
2290                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2291                 ) {
2292                         $recipient = User::newFromName( $shortTitle, false );
2293                         if ( !$recipient ) {
2294                                 wfDebug( __METHOD__ . ": invalid username\n" );
2295                         } else {
2296                                 // Allow extensions to prevent user notification
2297                                 // when a new message is added to their talk page
2298                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2299                                         if ( User::isIP( $shortTitle ) ) {
2300                                                 // An anonymous user
2301                                                 $recipient->setNewtalk( true, $revision );
2302                                         } elseif ( $recipient->isLoggedIn() ) {
2303                                                 $recipient->setNewtalk( true, $revision );
2304                                         } else {
2305                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2306                                         }
2307                                 }
2308                         }
2309                 }
2310
2311                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2312                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2313                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2314                         if ( $msgtext === false || $msgtext === null ) {
2315                                 $msgtext = '';
2316                         }
2317
2318                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2319
2320                         if ( $wgContLang->hasVariants() ) {
2321                                 $wgContLang->updateConversionTable( $this->mTitle );
2322                         }
2323                 }
2324
2325                 if ( $options['created'] ) {
2326                         self::onArticleCreate( $this->mTitle );
2327                 } elseif ( $options['changed'] ) { // bug 50785
2328                         self::onArticleEdit( $this->mTitle, $revision );
2329                 }
2330         }
2331
2332         /**
2333          * Edit an article without doing all that other stuff
2334          * The article must already exist; link tables etc
2335          * are not updated, caches are not flushed.
2336          *
2337          * @param Content $content Content submitted
2338          * @param User $user The relevant user
2339          * @param string $comment Comment submitted
2340          * @param bool $minor Whereas it's a minor modification
2341          * @param string $serialFormat Format for storing the content in the database
2342          */
2343         public function doQuickEditContent(
2344                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2345         ) {
2346
2347                 $serialized = $content->serialize( $serialFormat );
2348
2349                 $dbw = wfGetDB( DB_MASTER );
2350                 $revision = new Revision( [
2351                         'title'      => $this->getTitle(), // for determining the default content model
2352                         'page'       => $this->getId(),
2353                         'user_text'  => $user->getName(),
2354                         'user'       => $user->getId(),
2355                         'text'       => $serialized,
2356                         'length'     => $content->getSize(),
2357                         'comment'    => $comment,
2358                         'minor_edit' => $minor ? 1 : 0,
2359                 ] ); // XXX: set the content object?
2360                 $revision->insertOn( $dbw );
2361                 $this->updateRevisionOn( $dbw, $revision );
2362
2363                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2364
2365         }
2366
2367         /**
2368          * Update the article's restriction field, and leave a log entry.
2369          * This works for protection both existing and non-existing pages.
2370          *
2371          * @param array $limit Set of restriction keys
2372          * @param array $expiry Per restriction type expiration
2373          * @param int &$cascade Set to false if cascading protection isn't allowed.
2374          * @param string $reason
2375          * @param User $user The user updating the restrictions
2376          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2377          *   ($user should be able to add the specified tags before this is called)
2378          * @return Status Status object; if action is taken, $status->value is the log_id of the
2379          *   protection log entry.
2380          */
2381         public function doUpdateRestrictions( array $limit, array $expiry,
2382                 &$cascade, $reason, User $user, $tags = null
2383         ) {
2384                 global $wgCascadingRestrictionLevels, $wgContLang;
2385
2386                 if ( wfReadOnly() ) {
2387                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2388                 }
2389
2390                 $this->loadPageData( 'fromdbmaster' );
2391                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2392                 $id = $this->getId();
2393
2394                 if ( !$cascade ) {
2395                         $cascade = false;
2396                 }
2397
2398                 // Take this opportunity to purge out expired restrictions
2399                 Title::purgeExpiredRestrictions();
2400
2401                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2402                 // we expect a single selection, but the schema allows otherwise.
2403                 $isProtected = false;
2404                 $protect = false;
2405                 $changed = false;
2406
2407                 $dbw = wfGetDB( DB_MASTER );
2408
2409                 foreach ( $restrictionTypes as $action ) {
2410                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2411                                 $expiry[$action] = 'infinity';
2412                         }
2413                         if ( !isset( $limit[$action] ) ) {
2414                                 $limit[$action] = '';
2415                         } elseif ( $limit[$action] != '' ) {
2416                                 $protect = true;
2417                         }
2418
2419                         // Get current restrictions on $action
2420                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2421                         if ( $current != '' ) {
2422                                 $isProtected = true;
2423                         }
2424
2425                         if ( $limit[$action] != $current ) {
2426                                 $changed = true;
2427                         } elseif ( $limit[$action] != '' ) {
2428                                 // Only check expiry change if the action is actually being
2429                                 // protected, since expiry does nothing on an not-protected
2430                                 // action.
2431                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2432                                         $changed = true;
2433                                 }
2434                         }
2435                 }
2436
2437                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2438                         $changed = true;
2439                 }
2440
2441                 // If nothing has changed, do nothing
2442                 if ( !$changed ) {
2443                         return Status::newGood();
2444                 }
2445
2446                 if ( !$protect ) { // No protection at all means unprotection
2447                         $revCommentMsg = 'unprotectedarticle';
2448                         $logAction = 'unprotect';
2449                 } elseif ( $isProtected ) {
2450                         $revCommentMsg = 'modifiedarticleprotection';
2451                         $logAction = 'modify';
2452                 } else {
2453                         $revCommentMsg = 'protectedarticle';
2454                         $logAction = 'protect';
2455                 }
2456
2457                 // Truncate for whole multibyte characters
2458                 $reason = $wgContLang->truncate( $reason, 255 );
2459
2460                 $logRelationsValues = [];
2461                 $logRelationsField = null;
2462                 $logParamsDetails = [];
2463
2464                 // Null revision (used for change tag insertion)
2465                 $nullRevision = null;
2466
2467                 if ( $id ) { // Protection of existing page
2468                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2469                                 return Status::newGood();
2470                         }
2471
2472                         // Only certain restrictions can cascade...
2473                         $editrestriction = isset( $limit['edit'] )
2474                                 ? [ $limit['edit'] ]
2475                                 : $this->mTitle->getRestrictions( 'edit' );
2476                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2477                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2478                         }
2479                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2480                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2481                         }
2482
2483                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2484                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2485                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2486                         }
2487                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2488                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2489                         }
2490
2491                         // The schema allows multiple restrictions
2492                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2493                                 $cascade = false;
2494                         }
2495
2496                         // insert null revision to identify the page protection change as edit summary
2497                         $latest = $this->getLatest();
2498                         $nullRevision = $this->insertProtectNullRevision(
2499                                 $revCommentMsg,
2500                                 $limit,
2501                                 $expiry,
2502                                 $cascade,
2503                                 $reason,
2504                                 $user
2505                         );
2506
2507                         if ( $nullRevision === null ) {
2508                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2509                         }
2510
2511                         $logRelationsField = 'pr_id';
2512
2513                         // Update restrictions table
2514                         foreach ( $limit as $action => $restrictions ) {
2515                                 $dbw->delete(
2516                                         'page_restrictions',
2517                                         [
2518                                                 'pr_page' => $id,
2519                                                 'pr_type' => $action
2520                                         ],
2521                                         __METHOD__
2522                                 );
2523                                 if ( $restrictions != '' ) {
2524                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2525                                         $dbw->insert(
2526                                                 'page_restrictions',
2527                                                 [
2528                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2529                                                         'pr_page' => $id,
2530                                                         'pr_type' => $action,
2531                                                         'pr_level' => $restrictions,
2532                                                         'pr_cascade' => $cascadeValue,
2533                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2534                                                 ],
2535                                                 __METHOD__
2536                                         );
2537                                         $logRelationsValues[] = $dbw->insertId();
2538                                         $logParamsDetails[] = [
2539                                                 'type' => $action,
2540                                                 'level' => $restrictions,
2541                                                 'expiry' => $expiry[$action],
2542                                                 'cascade' => (bool)$cascadeValue,
2543                                         ];
2544                                 }
2545                         }
2546
2547                         // Clear out legacy restriction fields
2548                         $dbw->update(
2549                                 'page',
2550                                 [ 'page_restrictions' => '' ],
2551                                 [ 'page_id' => $id ],
2552                                 __METHOD__
2553                         );
2554
2555                         Hooks::run( 'NewRevisionFromEditComplete',
2556                                 [ $this, $nullRevision, $latest, $user ] );
2557                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2558                 } else { // Protection of non-existing page (also known as "title protection")
2559                         // Cascade protection is meaningless in this case
2560                         $cascade = false;
2561
2562                         if ( $limit['create'] != '' ) {
2563                                 $dbw->replace( 'protected_titles',
2564                                         [ [ 'pt_namespace', 'pt_title' ] ],
2565                                         [
2566                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2567                                                 'pt_title' => $this->mTitle->getDBkey(),
2568                                                 'pt_create_perm' => $limit['create'],
2569                                                 'pt_timestamp' => $dbw->timestamp(),
2570                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2571                                                 'pt_user' => $user->getId(),
2572                                                 'pt_reason' => $reason,
2573                                         ], __METHOD__
2574                                 );
2575                                 $logParamsDetails[] = [
2576                                         'type' => 'create',
2577                                         'level' => $limit['create'],
2578                                         'expiry' => $expiry['create'],
2579                                 ];
2580                         } else {
2581                                 $dbw->delete( 'protected_titles',
2582                                         [
2583                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2584                                                 'pt_title' => $this->mTitle->getDBkey()
2585                                         ], __METHOD__
2586                                 );
2587                         }
2588                 }
2589
2590                 $this->mTitle->flushRestrictions();
2591                 InfoAction::invalidateCache( $this->mTitle );
2592
2593                 if ( $logAction == 'unprotect' ) {
2594                         $params = [];
2595                 } else {
2596                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2597                         $params = [
2598                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2599                                 '5:bool:cascade' => $cascade,
2600                                 'details' => $logParamsDetails, // parameter for localize and api
2601                         ];
2602                 }
2603
2604                 // Update the protection log
2605                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2606                 $logEntry->setTarget( $this->mTitle );
2607                 $logEntry->setComment( $reason );
2608                 $logEntry->setPerformer( $user );
2609                 $logEntry->setParameters( $params );
2610                 if ( !is_null( $nullRevision ) ) {
2611                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2612                 }
2613                 $logEntry->setTags( $tags );
2614                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2615                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2616                 }
2617                 $logId = $logEntry->insert();
2618                 $logEntry->publish( $logId );
2619
2620                 return Status::newGood( $logId );
2621         }
2622
2623         /**
2624          * Insert a new null revision for this page.
2625          *
2626          * @param string $revCommentMsg Comment message key for the revision
2627          * @param array $limit Set of restriction keys
2628          * @param array $expiry Per restriction type expiration
2629          * @param int $cascade Set to false if cascading protection isn't allowed.
2630          * @param string $reason
2631          * @param User|null $user
2632          * @return Revision|null Null on error
2633          */
2634         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2635                 array $expiry, $cascade, $reason, $user = null
2636         ) {
2637                 global $wgContLang;
2638                 $dbw = wfGetDB( DB_MASTER );
2639
2640                 // Prepare a null revision to be added to the history
2641                 $editComment = $wgContLang->ucfirst(
2642                         wfMessage(
2643                                 $revCommentMsg,
2644                                 $this->mTitle->getPrefixedText()
2645                         )->inContentLanguage()->text()
2646                 );
2647                 if ( $reason ) {
2648                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2649                 }
2650                 $protectDescription = $this->protectDescription( $limit, $expiry );
2651                 if ( $protectDescription ) {
2652                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2653                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2654                                 ->inContentLanguage()->text();
2655                 }
2656                 if ( $cascade ) {
2657                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2658                         $editComment .= wfMessage( 'brackets' )->params(
2659                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2660                         )->inContentLanguage()->text();
2661                 }
2662
2663                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2664                 if ( $nullRev ) {
2665                         $nullRev->insertOn( $dbw );
2666
2667                         // Update page record and touch page
2668                         $oldLatest = $nullRev->getParentId();
2669                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2670                 }
2671
2672                 return $nullRev;
2673         }
2674
2675         /**
2676          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2677          * @return string
2678          */
2679         protected function formatExpiry( $expiry ) {
2680                 global $wgContLang;
2681
2682                 if ( $expiry != 'infinity' ) {
2683                         return wfMessage(
2684                                 'protect-expiring',
2685                                 $wgContLang->timeanddate( $expiry, false, false ),
2686                                 $wgContLang->date( $expiry, false, false ),
2687                                 $wgContLang->time( $expiry, false, false )
2688                         )->inContentLanguage()->text();
2689                 } else {
2690                         return wfMessage( 'protect-expiry-indefinite' )
2691                                 ->inContentLanguage()->text();
2692                 }
2693         }
2694
2695         /**
2696          * Builds the description to serve as comment for the edit.
2697          *
2698          * @param array $limit Set of restriction keys
2699          * @param array $expiry Per restriction type expiration
2700          * @return string
2701          */
2702         public function protectDescription( array $limit, array $expiry ) {
2703                 $protectDescription = '';
2704
2705                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2706                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2707                         # All possible message keys are listed here for easier grepping:
2708                         # * restriction-create
2709                         # * restriction-edit
2710                         # * restriction-move
2711                         # * restriction-upload
2712                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2713                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2714                         # with '' filtered out. All possible message keys are listed below:
2715                         # * protect-level-autoconfirmed
2716                         # * protect-level-sysop
2717                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2718                                 ->inContentLanguage()->text();
2719
2720                         $expiryText = $this->formatExpiry( $expiry[$action] );
2721
2722                         if ( $protectDescription !== '' ) {
2723                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2724                         }
2725                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2726                                 ->params( $actionText, $restrictionsText, $expiryText )
2727                                 ->inContentLanguage()->text();
2728                 }
2729
2730                 return $protectDescription;
2731         }
2732
2733         /**
2734          * Builds the description to serve as comment for the log entry.
2735          *
2736          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2737          * protect description text. Keep them in old format to avoid breaking compatibility.
2738          * TODO: Fix protection log to store structured description and format it on-the-fly.
2739          *
2740          * @param array $limit Set of restriction keys
2741          * @param array $expiry Per restriction type expiration
2742          * @return string
2743          */
2744         public function protectDescriptionLog( array $limit, array $expiry ) {
2745                 global $wgContLang;
2746
2747                 $protectDescriptionLog = '';
2748
2749                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2750                         $expiryText = $this->formatExpiry( $expiry[$action] );
2751                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2752                                 "[$action=$restrictions] ($expiryText)";
2753                 }
2754
2755                 return trim( $protectDescriptionLog );
2756         }
2757
2758         /**
2759          * Take an array of page restrictions and flatten it to a string
2760          * suitable for insertion into the page_restrictions field.
2761          *
2762          * @param string[] $limit
2763          *
2764          * @throws MWException
2765          * @return string
2766          */
2767         protected static function flattenRestrictions( $limit ) {
2768                 if ( !is_array( $limit ) ) {
2769                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2770                 }
2771
2772                 $bits = [];
2773                 ksort( $limit );
2774
2775                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2776                         $bits[] = "$action=$restrictions";
2777                 }
2778
2779                 return implode( ':', $bits );
2780         }
2781
2782         /**
2783          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2784          * backwards compatibility, if you care about error reporting you should use
2785          * doDeleteArticleReal() instead.
2786          *
2787          * Deletes the article with database consistency, writes logs, purges caches
2788          *
2789          * @param string $reason Delete reason for deletion log
2790          * @param bool $suppress Suppress all revisions and log the deletion in
2791          *        the suppression log instead of the deletion log
2792          * @param int $u1 Unused
2793          * @param bool $u2 Unused
2794          * @param array|string &$error Array of errors to append to
2795          * @param User $user The deleting user
2796          * @return bool True if successful
2797          */
2798         public function doDeleteArticle(
2799                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2800         ) {
2801                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2802                 return $status->isGood();
2803         }
2804
2805         /**
2806          * Back-end article deletion
2807          * Deletes the article with database consistency, writes logs, purges caches
2808          *
2809          * @since 1.19
2810          *
2811          * @param string $reason Delete reason for deletion log
2812          * @param bool $suppress Suppress all revisions and log the deletion in
2813          *   the suppression log instead of the deletion log
2814          * @param int $u1 Unused
2815          * @param bool $u2 Unused
2816          * @param array|string &$error Array of errors to append to
2817          * @param User $user The deleting user
2818          * @return Status Status object; if successful, $status->value is the log_id of the
2819          *   deletion log entry. If the page couldn't be deleted because it wasn't
2820          *   found, $status is a non-fatal 'cannotdelete' error
2821          */
2822         public function doDeleteArticleReal(
2823                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2824         ) {
2825                 global $wgUser, $wgContentHandlerUseDB;
2826
2827                 wfDebug( __METHOD__ . "\n" );
2828
2829                 $status = Status::newGood();
2830
2831                 if ( $this->mTitle->getDBkey() === '' ) {
2832                         $status->error( 'cannotdelete',
2833                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2834                         return $status;
2835                 }
2836
2837                 $user = is_null( $user ) ? $wgUser : $user;
2838                 if ( !Hooks::run( 'ArticleDelete',
2839                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2840                 ) ) {
2841                         if ( $status->isOK() ) {
2842                                 // Hook aborted but didn't set a fatal status
2843                                 $status->fatal( 'delete-hook-aborted' );
2844                         }
2845                         return $status;
2846                 }
2847
2848                 $dbw = wfGetDB( DB_MASTER );
2849                 $dbw->startAtomic( __METHOD__ );
2850
2851                 $this->loadPageData( self::READ_LATEST );
2852                 $id = $this->getId();
2853                 // T98706: lock the page from various other updates but avoid using
2854                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2855                 // the revisions queries (which also JOIN on user). Only lock the page
2856                 // row and CAS check on page_latest to see if the trx snapshot matches.
2857                 $lockedLatest = $this->lockAndGetLatest();
2858                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2859                         $dbw->endAtomic( __METHOD__ );
2860                         // Page not there or trx snapshot is stale
2861                         $status->error( 'cannotdelete',
2862                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2863                         return $status;
2864                 }
2865
2866                 // At this point we are now comitted to returning an OK
2867                 // status unless some DB query error or other exception comes up.
2868                 // This way callers don't have to call rollback() if $status is bad
2869                 // unless they actually try to catch exceptions (which is rare).
2870
2871                 // we need to remember the old content so we can use it to generate all deletion updates.
2872                 $content = $this->getContent( Revision::RAW );
2873
2874                 // Bitfields to further suppress the content
2875                 if ( $suppress ) {
2876                         $bitfield = 0;
2877                         // This should be 15...
2878                         $bitfield |= Revision::DELETED_TEXT;
2879                         $bitfield |= Revision::DELETED_COMMENT;
2880                         $bitfield |= Revision::DELETED_USER;
2881                         $bitfield |= Revision::DELETED_RESTRICTED;
2882                 } else {
2883                         $bitfield = 'rev_deleted';
2884                 }
2885
2886                 /**
2887                  * For now, shunt the revision data into the archive table.
2888                  * Text is *not* removed from the text table; bulk storage
2889                  * is left intact to avoid breaking block-compression or
2890                  * immutable storage schemes.
2891                  *
2892                  * For backwards compatibility, note that some older archive
2893                  * table entries will have ar_text and ar_flags fields still.
2894                  *
2895                  * In the future, we may keep revisions and mark them with
2896                  * the rev_deleted field, which is reserved for this purpose.
2897                  */
2898
2899                 $row = [
2900                         'ar_namespace'  => 'page_namespace',
2901                         'ar_title'      => 'page_title',
2902                         'ar_comment'    => 'rev_comment',
2903                         'ar_user'       => 'rev_user',
2904                         'ar_user_text'  => 'rev_user_text',
2905                         'ar_timestamp'  => 'rev_timestamp',
2906                         'ar_minor_edit' => 'rev_minor_edit',
2907                         'ar_rev_id'     => 'rev_id',
2908                         'ar_parent_id'  => 'rev_parent_id',
2909                         'ar_text_id'    => 'rev_text_id',
2910                         'ar_text'       => '\'\'', // Be explicit to appease
2911                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2912                         'ar_len'        => 'rev_len',
2913                         'ar_page_id'    => 'page_id',
2914                         'ar_deleted'    => $bitfield,
2915                         'ar_sha1'       => 'rev_sha1',
2916                 ];
2917
2918                 if ( $wgContentHandlerUseDB ) {
2919                         $row['ar_content_model'] = 'rev_content_model';
2920                         $row['ar_content_format'] = 'rev_content_format';
2921                 }
2922
2923                 // Copy all the page revisions into the archive table
2924                 $dbw->insertSelect(
2925                         'archive',
2926                         [ 'page', 'revision' ],
2927                         $row,
2928                         [
2929                                 'page_id' => $id,
2930                                 'page_id = rev_page'
2931                         ],
2932                         __METHOD__
2933                 );
2934                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2935                 $archivedRevisionCount = $dbw->affectedRows();
2936
2937                 // Now that it's safely backed up, delete it
2938                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2939
2940                 if ( !$dbw->cascadingDeletes() ) {
2941                         $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2942                 }
2943
2944                 // Clone the title, so we have the information we need when we log
2945                 $logTitle = clone $this->mTitle;
2946
2947                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2948                 $logtype = $suppress ? 'suppress' : 'delete';
2949
2950                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2951                 $logEntry->setPerformer( $user );
2952                 $logEntry->setTarget( $logTitle );
2953                 $logEntry->setComment( $reason );
2954                 $logid = $logEntry->insert();
2955
2956                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2957                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2958                         $logEntry->publish( $logid );
2959                 } );
2960
2961                 $dbw->endAtomic( __METHOD__ );
2962
2963                 $this->doDeleteUpdates( $id, $content );
2964
2965                 Hooks::run( 'ArticleDeleteComplete',
2966                         [ &$this, &$user, $reason, $id, $content, $logEntry, $archivedRevisionCount ] );
2967                 $status->value = $logid;
2968
2969                 // Show log excerpt on 404 pages rather than just a link
2970                 $cache = ObjectCache::getMainStashInstance();
2971                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2972                 $cache->set( $key, 1, $cache::TTL_DAY );
2973
2974                 return $status;
2975         }
2976
2977         /**
2978          * Lock the page row for this title+id and return page_latest (or 0)
2979          *
2980          * @return integer Returns 0 if no row was found with this title+id
2981          * @since 1.27
2982          */
2983         public function lockAndGetLatest() {
2984                 return (int)wfGetDB( DB_MASTER )->selectField(
2985                         'page',
2986                         'page_latest',
2987                         [
2988                                 'page_id' => $this->getId(),
2989                                 // Typically page_id is enough, but some code might try to do
2990                                 // updates assuming the title is the same, so verify that
2991                                 'page_namespace' => $this->getTitle()->getNamespace(),
2992                                 'page_title' => $this->getTitle()->getDBkey()
2993                         ],
2994                         __METHOD__,
2995                         [ 'FOR UPDATE' ]
2996                 );
2997         }
2998
2999         /**
3000          * Do some database updates after deletion
3001          *
3002          * @param int $id The page_id value of the page being deleted
3003          * @param Content $content Optional page content to be used when determining
3004          *   the required updates. This may be needed because $this->getContent()
3005          *   may already return null when the page proper was deleted.
3006          */
3007         public function doDeleteUpdates( $id, Content $content = null ) {
3008                 // Update site status
3009                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
3010
3011                 // Delete pagelinks, update secondary indexes, etc
3012                 $updates = $this->getDeletionUpdates( $content );
3013                 foreach ( $updates as $update ) {
3014                         DeferredUpdates::addUpdate( $update );
3015                 }
3016
3017                 // Reparse any pages transcluding this page
3018                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3019
3020                 // Reparse any pages including this image
3021                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3022                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3023                 }
3024
3025                 // Clear caches
3026                 WikiPage::onArticleDelete( $this->mTitle );
3027
3028                 // Reset this object and the Title object
3029                 $this->loadFromRow( false, self::READ_LATEST );
3030
3031                 // Search engine
3032                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3033         }
3034
3035         /**
3036          * Roll back the most recent consecutive set of edits to a page
3037          * from the same user; fails if there are no eligible edits to
3038          * roll back to, e.g. user is the sole contributor. This function
3039          * performs permissions checks on $user, then calls commitRollback()
3040          * to do the dirty work
3041          *
3042          * @todo Separate the business/permission stuff out from backend code
3043          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3044          *
3045          * @param string $fromP Name of the user whose edits to rollback.
3046          * @param string $summary Custom summary. Set to default summary if empty.
3047          * @param string $token Rollback token.
3048          * @param bool $bot If true, mark all reverted edits as bot.
3049          *
3050          * @param array $resultDetails Array contains result-specific array of additional values
3051          *    'alreadyrolled' : 'current' (rev)
3052          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3053          *
3054          * @param User $user The user performing the rollback
3055          * @param array|null $tags Change tags to apply to the rollback
3056          * Callers are responsible for permission checks
3057          * (with ChangeTags::canAddTagsAccompanyingChange)
3058          *
3059          * @return array Array of errors, each error formatted as
3060          *   array(messagekey, param1, param2, ...).
3061          * On success, the array is empty.  This array can also be passed to
3062          * OutputPage::showPermissionsErrorPage().
3063          */
3064         public function doRollback(
3065                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3066         ) {
3067                 $resultDetails = null;
3068
3069                 // Check permissions
3070                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3071                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3072                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3073
3074                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3075                         $errors[] = [ 'sessionfailure' ];
3076                 }
3077
3078                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3079                         $errors[] = [ 'actionthrottledtext' ];
3080                 }
3081
3082                 // If there were errors, bail out now
3083                 if ( !empty( $errors ) ) {
3084                         return $errors;
3085                 }
3086
3087                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3088         }
3089
3090         /**
3091          * Backend implementation of doRollback(), please refer there for parameter
3092          * and return value documentation
3093          *
3094          * NOTE: This function does NOT check ANY permissions, it just commits the
3095          * rollback to the DB. Therefore, you should only call this function direct-
3096          * ly if you want to use custom permissions checks. If you don't, use
3097          * doRollback() instead.
3098          * @param string $fromP Name of the user whose edits to rollback.
3099          * @param string $summary Custom summary. Set to default summary if empty.
3100          * @param bool $bot If true, mark all reverted edits as bot.
3101          *
3102          * @param array $resultDetails Contains result-specific array of additional values
3103          * @param User $guser The user performing the rollback
3104          * @param array|null $tags Change tags to apply to the rollback
3105          * Callers are responsible for permission checks
3106          * (with ChangeTags::canAddTagsAccompanyingChange)
3107          *
3108          * @return array
3109          */
3110         public function commitRollback( $fromP, $summary, $bot,
3111                 &$resultDetails, User $guser, $tags = null
3112         ) {
3113                 global $wgUseRCPatrol, $wgContLang;
3114
3115                 $dbw = wfGetDB( DB_MASTER );
3116
3117                 if ( wfReadOnly() ) {
3118                         return [ [ 'readonlytext' ] ];
3119                 }
3120
3121                 // Get the last editor
3122                 $current = $this->getRevision();
3123                 if ( is_null( $current ) ) {
3124                         // Something wrong... no page?
3125                         return [ [ 'notanarticle' ] ];
3126                 }
3127
3128                 $from = str_replace( '_', ' ', $fromP );
3129                 // User name given should match up with the top revision.
3130                 // If the user was deleted then $from should be empty.
3131                 if ( $from != $current->getUserText() ) {
3132                         $resultDetails = [ 'current' => $current ];
3133                         return [ [ 'alreadyrolled',
3134                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3135                                 htmlspecialchars( $fromP ),
3136                                 htmlspecialchars( $current->getUserText() )
3137                         ] ];
3138                 }
3139
3140                 // Get the last edit not by this person...
3141                 // Note: these may not be public values
3142                 $user = intval( $current->getUser( Revision::RAW ) );
3143                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3144                 $s = $dbw->selectRow( 'revision',
3145                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3146                         [ 'rev_page' => $current->getPage(),
3147                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3148                         ], __METHOD__,
3149                         [ 'USE INDEX' => 'page_timestamp',
3150                                 'ORDER BY' => 'rev_timestamp DESC' ]
3151                         );
3152                 if ( $s === false ) {
3153                         // No one else ever edited this page
3154                         return [ [ 'cantrollback' ] ];
3155                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3156                         || $s->rev_deleted & Revision::DELETED_USER
3157                 ) {
3158                         // Only admins can see this text
3159                         return [ [ 'notvisiblerev' ] ];
3160                 }
3161
3162                 // Generate the edit summary if necessary
3163                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3164                 if ( empty( $summary ) ) {
3165                         if ( $from == '' ) { // no public user name
3166                                 $summary = wfMessage( 'revertpage-nouser' );
3167                         } else {
3168                                 $summary = wfMessage( 'revertpage' );
3169                         }
3170                 }
3171
3172                 // Allow the custom summary to use the same args as the default message
3173                 $args = [
3174                         $target->getUserText(), $from, $s->rev_id,
3175                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3176                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3177                 ];
3178                 if ( $summary instanceof Message ) {
3179                         $summary = $summary->params( $args )->inContentLanguage()->text();
3180                 } else {
3181                         $summary = wfMsgReplaceArgs( $summary, $args );
3182                 }
3183
3184                 // Trim spaces on user supplied text
3185                 $summary = trim( $summary );
3186
3187                 // Truncate for whole multibyte characters.
3188                 $summary = $wgContLang->truncate( $summary, 255 );
3189
3190                 // Save
3191                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3192
3193                 if ( $guser->isAllowed( 'minoredit' ) ) {
3194                         $flags |= EDIT_MINOR;
3195                 }
3196
3197                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3198                         $flags |= EDIT_FORCE_BOT;
3199                 }
3200
3201                 // Actually store the edit
3202                 $status = $this->doEditContent(
3203                         $target->getContent(),
3204                         $summary,
3205                         $flags,
3206                         $target->getId(),
3207                         $guser,
3208                         null,
3209                         $tags
3210                 );
3211
3212                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3213                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3214                 $set = [];
3215                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3216                         // Mark all reverted edits as bot
3217                         $set['rc_bot'] = 1;
3218                 }
3219
3220                 if ( $wgUseRCPatrol ) {
3221                         // Mark all reverted edits as patrolled
3222                         $set['rc_patrolled'] = 1;
3223                 }
3224
3225                 if ( count( $set ) ) {
3226                         $dbw->update( 'recentchanges', $set,
3227                                 [ /* WHERE */
3228                                         'rc_cur_id' => $current->getPage(),
3229                                         'rc_user_text' => $current->getUserText(),
3230                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3231                                 ],
3232                                 __METHOD__
3233                         );
3234                 }
3235
3236                 if ( !$status->isOK() ) {
3237                         return $status->getErrorsArray();
3238                 }
3239
3240                 // raise error, when the edit is an edit without a new version
3241                 $statusRev = isset( $status->value['revision'] )
3242                         ? $status->value['revision']
3243                         : null;
3244                 if ( !( $statusRev instanceof Revision ) ) {
3245                         $resultDetails = [ 'current' => $current ];
3246                         return [ [ 'alreadyrolled',
3247                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3248                                         htmlspecialchars( $fromP ),
3249                                         htmlspecialchars( $current->getUserText() )
3250                         ] ];
3251                 }
3252
3253                 $revId = $statusRev->getId();
3254
3255                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3256
3257                 $resultDetails = [
3258                         'summary' => $summary,
3259                         'current' => $current,
3260                         'target' => $target,
3261                         'newid' => $revId
3262                 ];
3263
3264                 return [];
3265         }
3266
3267         /**
3268          * The onArticle*() functions are supposed to be a kind of hooks
3269          * which should be called whenever any of the specified actions
3270          * are done.
3271          *
3272          * This is a good place to put code to clear caches, for instance.
3273          *
3274          * This is called on page move and undelete, as well as edit
3275          *
3276          * @param Title $title
3277          */
3278         public static function onArticleCreate( Title $title ) {
3279                 // Update existence markers on article/talk tabs...
3280                 $other = $title->getOtherPage();
3281
3282                 $other->purgeSquid();
3283
3284                 $title->touchLinks();
3285                 $title->purgeSquid();
3286                 $title->deleteTitleProtection();
3287
3288                 if ( $title->getNamespace() == NS_CATEGORY ) {
3289                         // Load the Category object, which will schedule a job to create
3290                         // the category table row if necessary. Checking a slave is ok
3291                         // here, in the worst case it'll run an unnecessary recount job on
3292                         // a category that probably doesn't have many members.
3293                         Category::newFromTitle( $title )->getID();
3294                 }
3295         }
3296
3297         /**
3298          * Clears caches when article is deleted
3299          *
3300          * @param Title $title
3301          */
3302         public static function onArticleDelete( Title $title ) {
3303                 global $wgContLang;
3304
3305                 // Update existence markers on article/talk tabs...
3306                 $other = $title->getOtherPage();
3307
3308                 $other->purgeSquid();
3309
3310                 $title->touchLinks();
3311                 $title->purgeSquid();
3312
3313                 // File cache
3314                 HTMLFileCache::clearFileCache( $title );
3315                 InfoAction::invalidateCache( $title );
3316
3317                 // Messages
3318                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3319                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3320
3321                         if ( $wgContLang->hasVariants() ) {
3322                                 $wgContLang->updateConversionTable( $title );
3323                         }
3324                 }
3325
3326                 // Images
3327                 if ( $title->getNamespace() == NS_FILE ) {
3328                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3329                 }
3330
3331                 // User talk pages
3332                 if ( $title->getNamespace() == NS_USER_TALK ) {
3333                         $user = User::newFromName( $title->getText(), false );
3334                         if ( $user ) {
3335                                 $user->setNewtalk( false );
3336                         }
3337                 }
3338
3339                 // Image redirects
3340                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3341         }
3342
3343         /**
3344          * Purge caches on page update etc
3345          *
3346          * @param Title $title
3347          * @param Revision|null $revision Revision that was just saved, may be null
3348          */
3349         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3350                 // Invalidate caches of articles which include this page
3351                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3352
3353                 // Invalidate the caches of all pages which redirect here
3354                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3355
3356                 // Purge CDN for this page only
3357                 $title->purgeSquid();
3358                 // Clear file cache for this page only
3359                 HTMLFileCache::clearFileCache( $title );
3360
3361                 $revid = $revision ? $revision->getId() : null;
3362                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3363                         InfoAction::invalidateCache( $title, $revid );
3364                 } );
3365         }
3366
3367         /**#@-*/
3368
3369         /**
3370          * Returns a list of categories this page is a member of.
3371          * Results will include hidden categories
3372          *
3373          * @return TitleArray
3374          */
3375         public function getCategories() {
3376                 $id = $this->getId();
3377                 if ( $id == 0 ) {
3378                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3379                 }
3380
3381                 $dbr = wfGetDB( DB_SLAVE );
3382                 $res = $dbr->select( 'categorylinks',
3383                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3384                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3385                         // as not being aliases, and NS_CATEGORY is numeric
3386                         [ 'cl_from' => $id ],
3387                         __METHOD__ );
3388
3389                 return TitleArray::newFromResult( $res );
3390         }
3391
3392         /**
3393          * Returns a list of hidden categories this page is a member of.
3394          * Uses the page_props and categorylinks tables.
3395          *
3396          * @return array Array of Title objects
3397          */
3398         public function getHiddenCategories() {
3399                 $result = [];
3400                 $id = $this->getId();
3401
3402                 if ( $id == 0 ) {
3403                         return [];
3404                 }
3405
3406                 $dbr = wfGetDB( DB_SLAVE );
3407                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3408                         [ 'cl_to' ],
3409                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3410                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3411                         __METHOD__ );
3412
3413                 if ( $res !== false ) {
3414                         foreach ( $res as $row ) {
3415                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3416                         }
3417                 }
3418
3419                 return $result;
3420         }
3421
3422         /**
3423          * Return an applicable autosummary if one exists for the given edit.
3424          * @param string|null $oldtext The previous text of the page.
3425          * @param string|null $newtext The submitted text of the page.
3426          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3427          * @return string An appropriate autosummary, or an empty string.
3428          *
3429          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3430          */
3431         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3432                 // NOTE: stub for backwards-compatibility. assumes the given text is
3433                 // wikitext. will break horribly if it isn't.
3434
3435                 ContentHandler::deprecated( __METHOD__, '1.21' );
3436
3437                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3438                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3439                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3440
3441                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3442         }
3443
3444         /**
3445          * Auto-generates a deletion reason
3446          *
3447          * @param bool &$hasHistory Whether the page has a history
3448          * @return string|bool String containing deletion reason or empty string, or boolean false
3449          *    if no revision occurred
3450          */
3451         public function getAutoDeleteReason( &$hasHistory ) {
3452                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3453         }
3454
3455         /**
3456          * Update all the appropriate counts in the category table, given that
3457          * we've added the categories $added and deleted the categories $deleted.
3458          *
3459          * @param array $added The names of categories that were added
3460          * @param array $deleted The names of categories that were deleted
3461          * @param integer $id Page ID (this should be the original deleted page ID)
3462          */
3463         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3464                 $id = $id ?: $this->getId();
3465                 $dbw = wfGetDB( DB_MASTER );
3466                 $method = __METHOD__;
3467                 // Do this at the end of the commit to reduce lock wait timeouts
3468                 $dbw->onTransactionPreCommitOrIdle(
3469                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3470                                 $ns = $this->getTitle()->getNamespace();
3471
3472                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3473                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3474                                 if ( $ns == NS_CATEGORY ) {
3475                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3476                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3477                                 } elseif ( $ns == NS_FILE ) {
3478                                         $addFields[] = 'cat_files = cat_files + 1';
3479                                         $removeFields[] = 'cat_files = cat_files - 1';
3480                                 }
3481
3482                                 if ( count( $added ) ) {
3483                                         $existingAdded = $dbw->selectFieldValues(
3484                                                 'category',
3485                                                 'cat_title',
3486                                                 [ 'cat_title' => $added ],
3487                                                 $method
3488                                         );
3489
3490                                         // For category rows that already exist, do a plain
3491                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3492                                         // to avoid creating gaps in the cat_id sequence.
3493                                         if ( count( $existingAdded ) ) {
3494                                                 $dbw->update(
3495                                                         'category',
3496                                                         $addFields,
3497                                                         [ 'cat_title' => $existingAdded ],
3498                                                         $method
3499                                                 );
3500                                         }
3501
3502                                         $missingAdded = array_diff( $added, $existingAdded );
3503                                         if ( count( $missingAdded ) ) {
3504                                                 $insertRows = [];
3505                                                 foreach ( $missingAdded as $cat ) {
3506                                                         $insertRows[] = [
3507                                                                 'cat_title'   => $cat,
3508                                                                 'cat_pages'   => 1,
3509                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3510                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3511                                                         ];
3512                                                 }
3513                                                 $dbw->upsert(
3514                                                         'category',
3515                                                         $insertRows,
3516                                                         [ 'cat_title' ],
3517                                                         $addFields,
3518                                                         $method
3519                                                 );
3520                                         }
3521                                 }
3522
3523                                 if ( count( $deleted ) ) {
3524                                         $dbw->update(
3525                                                 'category',
3526                                                 $removeFields,
3527                                                 [ 'cat_title' => $deleted ],
3528                                                 $method
3529                                         );
3530                                 }
3531
3532                                 foreach ( $added as $catName ) {
3533                                         $cat = Category::newFromName( $catName );
3534                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3535                                 }
3536
3537                                 foreach ( $deleted as $catName ) {
3538                                         $cat = Category::newFromName( $catName );
3539                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3540                                 }
3541
3542                                 // Refresh counts on categories that should be empty now, to
3543                                 // trigger possible deletion. Check master for the most
3544                                 // up-to-date cat_pages.
3545                                 if ( count( $deleted ) ) {
3546                                         $rows = $dbw->select(
3547                                                 'category',
3548                                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3549                                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3550                                                 $method
3551                                         );
3552                                         foreach ( $rows as $row ) {
3553                                                 $cat = Category::newFromRow( $row );
3554                                                 $cat->refreshCounts();
3555                                         }
3556                                 }
3557                         }
3558                 );
3559         }
3560
3561         /**
3562          * Opportunistically enqueue link update jobs given fresh parser output if useful
3563          *
3564          * @param ParserOutput $parserOutput Current version page output
3565          * @since 1.25
3566          */
3567         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3568                 if ( wfReadOnly() ) {
3569                         return;
3570                 }
3571
3572                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3573                         [ $this, $this->mTitle, $parserOutput ]
3574                 ) ) {
3575                         return;
3576                 }
3577
3578                 $config = RequestContext::getMain()->getConfig();
3579
3580                 $params = [
3581                         'isOpportunistic' => true,
3582                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3583                 ];
3584
3585                 if ( $this->mTitle->areRestrictionsCascading() ) {
3586                         // If the page is cascade protecting, the links should really be up-to-date
3587                         JobQueueGroup::singleton()->lazyPush(
3588                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3589                         );
3590                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3591                         // Assume the output contains "dynamic" time/random based magic words.
3592                         // Only update pages that expired due to dynamic content and NOT due to edits
3593                         // to referenced templates/files. When the cache expires due to dynamic content,
3594                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3595                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3596                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3597                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3598                                 // If a page is uncacheable, do not keep spamming a job for it.
3599                                 // Although it would be de-duplicated, it would still waste I/O.
3600                                 $cache = ObjectCache::getLocalClusterInstance();
3601                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3602                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3603                                 if ( $cache->add( $key, time(), $ttl ) ) {
3604                                         JobQueueGroup::singleton()->lazyPush(
3605                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3606                                         );
3607                                 }
3608                         }
3609                 }
3610         }
3611
3612         /**
3613          * Returns a list of updates to be performed when this page is deleted. The
3614          * updates should remove any information about this page from secondary data
3615          * stores such as links tables.
3616          *
3617          * @param Content|null $content Optional Content object for determining the
3618          *   necessary updates.
3619          * @return DataUpdate[]
3620          */
3621         public function getDeletionUpdates( Content $content = null ) {
3622                 if ( !$content ) {
3623                         // load content object, which may be used to determine the necessary updates.
3624                         // XXX: the content may not be needed to determine the updates.
3625                         $content = $this->getContent( Revision::RAW );
3626                 }
3627
3628                 if ( !$content ) {
3629                         $updates = [];
3630                 } else {
3631                         $updates = $content->getDeletionUpdates( $this );
3632                 }
3633
3634                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3635                 return $updates;
3636         }
3637 }