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