includes/page/WikiPage.php

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