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