includes/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  * @internal documentation reviewed 15 Mar 2010
  36  */
  37 class WikiPage implements Page, IDBAccessObject {
  38         // Constants for $mDataLoadedFrom and related
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         /**@}}*/
  52
  53         /** @var stdclass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  54         public $mPreparedEdit = false;
  55
  56         /**
  57          * @var int
  58          */
  59         protected $mId = null;
  60
  61         /**
  62          * @var int; one of the READ_* constants
  63          */
  64         protected $mDataLoadedFrom = self::READ_NONE;
  65
  66         /**
  67          * @var Title
  68          */
  69         protected $mRedirectTarget = null;
  70
  71         /**
  72          * @var Revision
  73          */
  74         protected $mLastRevision = null;
  75
  76         /**
  77          * @var string; timestamp of the current revision or empty string if not loaded
  78          */
  79         protected $mTimestamp = '';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mTouched = '19700101000000';
  85
  86         /**
  87          * @var string
  88          */
  89         protected $mLinksUpdated = '19700101000000';
  90
  91         /**
  92          * @var int|null
  93          */
  94         protected $mCounter = null;
  95
  96         /**
  97          * Constructor and clear the article
  98          * @param $title Title Reference to a Title object.
  99          */
 100         public function __construct( Title $title ) {
 101                 $this->mTitle = $title;
 102         }
 103
 104         /**
 105          * Create a WikiPage object of the appropriate class for the given title.
 106          *
 107          * @param $title Title
 108          * @throws MWException
 109          * @return WikiPage object of the appropriate type
 110          */
 111         public static function factory( Title $title ) {
 112                 $ns = $title->getNamespace();
 113
 114                 if ( $ns == NS_MEDIA ) {
 115                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 116                 } elseif ( $ns < 0 ) {
 117                         throw new MWException( "Invalid or virtual namespace $ns given." );
 118                 }
 119
 120                 switch ( $ns ) {
 121                         case NS_FILE:
 122                                 $page = new WikiFilePage( $title );
 123                                 break;
 124                         case NS_CATEGORY:
 125                                 $page = new WikiCategoryPage( $title );
 126                                 break;
 127                         default:
 128                                 $page = new WikiPage( $title );
 129                 }
 130
 131                 return $page;
 132         }
 133
 134         /**
 135          * Constructor from a page id
 136          *
 137          * @param int $id article ID to load
 138          * @param string|int $from one of the following values:
 139          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 140          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 141          *
 142          * @return WikiPage|null
 143          */
 144         public static function newFromID( $id, $from = 'fromdb' ) {
 145                 $from = self::convertSelectType( $from );
 146                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 147                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 148                 if ( !$row ) {
 149                         return null;
 150                 }
 151                 return self::newFromRow( $row, $from );
 152         }
 153
 154         /**
 155          * Constructor from a database row
 156          *
 157          * @since 1.20
 158          * @param $row object: database row containing at least fields returned
 159          *        by selectFields().
 160          * @param string|int $from source of $data:
 161          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 162          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 163          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 164          * @return WikiPage
 165          */
 166         public static function newFromRow( $row, $from = 'fromdb' ) {
 167                 $page = self::factory( Title::newFromRow( $row ) );
 168                 $page->loadFromRow( $row, $from );
 169                 return $page;
 170         }
 171
 172         /**
 173          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 174          *
 175          * @param $type object|string|int
 176          * @return mixed
 177          */
 178         private static function convertSelectType( $type ) {
 179                 switch ( $type ) {
 180                 case 'fromdb':
 181                         return self::READ_NORMAL;
 182                 case 'fromdbmaster':
 183                         return self::READ_LATEST;
 184                 case 'forupdate':
 185                         return self::READ_LOCKING;
 186                 default:
 187                         // It may already be an integer or whatever else
 188                         return $type;
 189                 }
 190         }
 191
 192         /**
 193          * Returns overrides for action handlers.
 194          * Classes listed here will be used instead of the default one when
 195          * (and only when) $wgActions[$action] === true. This allows subclasses
 196          * to override the default behavior.
 197          *
 198          * @todo Move this UI stuff somewhere else
 199          *
 200          * @return Array
 201          */
 202         public function getActionOverrides() {
 203                 $content_handler = $this->getContentHandler();
 204                 return $content_handler->getActionOverrides();
 205         }
 206
 207         /**
 208          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 209          *
 210          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 211          *
 212          * @return ContentHandler
 213          *
 214          * @since 1.21
 215          */
 216         public function getContentHandler() {
 217                 return ContentHandler::getForModelID( $this->getContentModel() );
 218         }
 219
 220         /**
 221          * Get the title object of the article
 222          * @return Title object of this page
 223          */
 224         public function getTitle() {
 225                 return $this->mTitle;
 226         }
 227
 228         /**
 229          * Clear the object
 230          * @return void
 231          */
 232         public function clear() {
 233                 $this->mDataLoaded = false;
 234                 $this->mDataLoadedFrom = self::READ_NONE;
 235
 236                 $this->clearCacheFields();
 237         }
 238
 239         /**
 240          * Clear the object cache fields
 241          * @return void
 242          */
 243         protected function clearCacheFields() {
 244                 $this->mId = null;
 245                 $this->mCounter = null;
 246                 $this->mRedirectTarget = null; // Title object if set
 247                 $this->mLastRevision = null; // Latest revision
 248                 $this->mTouched = '19700101000000';
 249                 $this->mLinksUpdated = '19700101000000';
 250                 $this->mTimestamp = '';
 251                 $this->mIsRedirect = false;
 252                 $this->mLatest = false;
 253                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 254                 // the requested rev ID and content against the cached one for equality. For most
 255                 // content types, the output should not change during the lifetime of this cache.
 256                 // Clearing it can cause extra parses on edit for no reason.
 257         }
 258
 259         /**
 260          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 261          * @return void
 262          * @since 1.23
 263          */
 264         public function clearPreparedEdit() {
 265                 $this->mPreparedEdit = false;
 266         }
 267
 268         /**
 269          * Return the list of revision fields that should be selected to create
 270          * a new page.
 271          *
 272          * @return array
 273          */
 274         public static function selectFields() {
 275                 global $wgContentHandlerUseDB;
 276
 277                 $fields = array(
 278                         'page_id',
 279                         'page_namespace',
 280                         'page_title',
 281                         'page_restrictions',
 282                         'page_counter',
 283                         'page_is_redirect',
 284                         'page_is_new',
 285                         'page_random',
 286                         'page_touched',
 287                         'page_links_updated',
 288                         'page_latest',
 289                         'page_len',
 290                 );
 291
 292                 if ( $wgContentHandlerUseDB ) {
 293                         $fields[] = 'page_content_model';
 294                 }
 295
 296                 return $fields;
 297         }
 298
 299         /**
 300          * Fetch a page record with the given conditions
 301          * @param $dbr DatabaseBase object
 302          * @param $conditions Array
 303          * @param $options Array
 304          * @return mixed Database result resource, or false on failure
 305          */
 306         protected function pageData( $dbr, $conditions, $options = array() ) {
 307                 $fields = self::selectFields();
 308
 309                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 310
 311                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 312
 313                 wfRunHooks( 'ArticlePageDataAfter', array( &$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 $dbr DatabaseBase object
 323          * @param $title Title object
 324          * @param $options Array
 325          * @return mixed 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 $dbr DatabaseBase
 337          * @param $id Integer
 338          * @param $options Array
 339          * @return mixed 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          * Set the general counter, title etc data loaded from
 347          * some source.
 348          *
 349          * @param $from object|string|int One of the following:
 350          *        - A DB query result object
 351          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 352          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 353          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB 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 $data object: database row containing at least fields returned
 393          *        by selectFields()
 394          * @param string|int $from One of the following:
 395          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 396          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 397          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 398          *          the master DB using SELECT FOR UPDATE
 399          */
 400         public function loadFromRow( $data, $from ) {
 401                 $lc = LinkCache::singleton();
 402                 $lc->clearLink( $this->mTitle );
 403
 404                 if ( $data ) {
 405                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 406
 407                         $this->mTitle->loadFromRow( $data );
 408
 409                         // Old-fashioned restrictions
 410                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 411
 412                         $this->mId = intval( $data->page_id );
 413                         $this->mCounter = intval( $data->page_counter );
 414                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 416                         $this->mIsRedirect = intval( $data->page_is_redirect );
 417                         $this->mLatest = intval( $data->page_latest );
 418                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 419                         // Double-check the ID of any cached latest Revision object for consistency.
 420                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 421                                 $this->mLastRevision = null;
 422                                 $this->mTimestamp = '';
 423                         }
 424                 } else {
 425                         $lc->addBadLinkObj( $this->mTitle );
 426
 427                         $this->mTitle->loadFromRow( false );
 428
 429                         $this->clearCacheFields();
 430
 431                         $this->mId = 0;
 432                 }
 433
 434                 $this->mDataLoaded = true;
 435                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 436         }
 437
 438         /**
 439          * @return int Page ID
 440          */
 441         public function getId() {
 442                 if ( !$this->mDataLoaded ) {
 443                         $this->loadPageData();
 444                 }
 445                 return $this->mId;
 446         }
 447
 448         /**
 449          * @return bool Whether or not the page exists in the database
 450          */
 451         public function exists() {
 452                 if ( !$this->mDataLoaded ) {
 453                         $this->loadPageData();
 454                 }
 455                 return $this->mId > 0;
 456         }
 457
 458         /**
 459          * Check if this page is something we're going to be showing
 460          * some sort of sensible content for. If we return false, page
 461          * views (plain action=view) will return an HTTP 404 response,
 462          * so spiders and robots can know they're following a bad link.
 463          *
 464          * @return bool
 465          */
 466         public function hasViewableContent() {
 467                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 468         }
 469
 470         /**
 471          * @return int The view count for the page
 472          */
 473         public function getCount() {
 474                 if ( !$this->mDataLoaded ) {
 475                         $this->loadPageData();
 476                 }
 477
 478                 return $this->mCounter;
 479         }
 480
 481         /**
 482          * Tests if the article content represents a redirect
 483          *
 484          * @return bool
 485          */
 486         public function isRedirect() {
 487                 $content = $this->getContent();
 488                 if ( !$content ) {
 489                         return false;
 490                 }
 491
 492                 return $content->isRedirect();
 493         }
 494
 495         /**
 496          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 497          *
 498          * Will use the revisions actual content model if the page exists,
 499          * and the page's default if the page doesn't exist yet.
 500          *
 501          * @return String
 502          *
 503          * @since 1.21
 504          */
 505         public function getContentModel() {
 506                 if ( $this->exists() ) {
 507                         // look at the revision's actual content model
 508                         $rev = $this->getRevision();
 509
 510                         if ( $rev !== null ) {
 511                                 return $rev->getContentModel();
 512                         } else {
 513                                 $title = $this->mTitle->getPrefixedDBkey();
 514                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 515                         }
 516                 }
 517
 518                 // use the default model for this page
 519                 return $this->mTitle->getContentModel();
 520         }
 521
 522         /**
 523          * Loads page_touched and returns a value indicating if it should be used
 524          * @return boolean true if not a redirect
 525          */
 526         public function checkTouched() {
 527                 if ( !$this->mDataLoaded ) {
 528                         $this->loadPageData();
 529                 }
 530                 return !$this->mIsRedirect;
 531         }
 532
 533         /**
 534          * Get the page_touched field
 535          * @return string containing GMT timestamp
 536          */
 537         public function getTouched() {
 538                 if ( !$this->mDataLoaded ) {
 539                         $this->loadPageData();
 540                 }
 541                 return $this->mTouched;
 542         }
 543
 544         /**
 545          * Get the page_links_updated field
 546          * @return string|null containing GMT timestamp
 547          */
 548         public function getLinksTimestamp() {
 549                 if ( !$this->mDataLoaded ) {
 550                         $this->loadPageData();
 551                 }
 552                 return $this->mLinksUpdated;
 553         }
 554
 555         /**
 556          * Get the page_latest field
 557          * @return integer rev_id of current revision
 558          */
 559         public function getLatest() {
 560                 if ( !$this->mDataLoaded ) {
 561                         $this->loadPageData();
 562                 }
 563                 return (int)$this->mLatest;
 564         }
 565
 566         /**
 567          * Get the Revision object of the oldest revision
 568          * @return Revision|null
 569          */
 570         public function getOldestRevision() {
 571                 wfProfileIn( __METHOD__ );
 572
 573                 // Try using the slave database first, then try the master
 574                 $continue = 2;
 575                 $db = wfGetDB( DB_SLAVE );
 576                 $revSelectFields = Revision::selectFields();
 577
 578                 $row = null;
 579                 while ( $continue ) {
 580                         $row = $db->selectRow(
 581                                 array( 'page', 'revision' ),
 582                                 $revSelectFields,
 583                                 array(
 584                                         'page_namespace' => $this->mTitle->getNamespace(),
 585                                         'page_title' => $this->mTitle->getDBkey(),
 586                                         'rev_page = page_id'
 587                                 ),
 588                                 __METHOD__,
 589                                 array(
 590                                         'ORDER BY' => 'rev_timestamp ASC'
 591                                 )
 592                         );
 593
 594                         if ( $row ) {
 595                                 $continue = 0;
 596                         } else {
 597                                 $db = wfGetDB( DB_MASTER );
 598                                 $continue--;
 599                         }
 600                 }
 601
 602                 wfProfileOut( __METHOD__ );
 603                 return $row ? Revision::newFromRow( $row ) : null;
 604         }
 605
 606         /**
 607          * Loads everything except the text
 608          * This isn't necessary for all uses, so it's only done if needed.
 609          */
 610         protected function loadLastEdit() {
 611                 if ( $this->mLastRevision !== null ) {
 612                         return; // already loaded
 613                 }
 614
 615                 $latest = $this->getLatest();
 616                 if ( !$latest ) {
 617                         return; // page doesn't exist or is missing page_latest info
 618                 }
 619
 620                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 621                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 622                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 623                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 624                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 625                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 626                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 627                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 628                 if ( $revision ) { // sanity
 629                         $this->setLastEdit( $revision );
 630                 }
 631         }
 632
 633         /**
 634          * Set the latest revision
 635          */
 636         protected function setLastEdit( Revision $revision ) {
 637                 $this->mLastRevision = $revision;
 638                 $this->mTimestamp = $revision->getTimestamp();
 639         }
 640
 641         /**
 642          * Get the latest revision
 643          * @return Revision|null
 644          */
 645         public function getRevision() {
 646                 $this->loadLastEdit();
 647                 if ( $this->mLastRevision ) {
 648                         return $this->mLastRevision;
 649                 }
 650                 return null;
 651         }
 652
 653         /**
 654          * Get the content of the current revision. No side-effects...
 655          *
 656          * @param $audience Integer: one of:
 657          *      Revision::FOR_PUBLIC       to be displayed to all users
 658          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 659          *      Revision::RAW              get the text regardless of permissions
 660          * @param $user User object to check for, only if FOR_THIS_USER is passed
 661          *              to the $audience parameter
 662          * @return Content|null The content of the current revision
 663          *
 664          * @since 1.21
 665          */
 666         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 667                 $this->loadLastEdit();
 668                 if ( $this->mLastRevision ) {
 669                         return $this->mLastRevision->getContent( $audience, $user );
 670                 }
 671                 return null;
 672         }
 673
 674         /**
 675          * Get the text of the current revision. No side-effects...
 676          *
 677          * @param $audience Integer: one of:
 678          *      Revision::FOR_PUBLIC       to be displayed to all users
 679          *      Revision::FOR_THIS_USER    to be displayed to the given user
 680          *      Revision::RAW              get the text regardless of permissions
 681          * @param $user User object to check for, only if FOR_THIS_USER is passed
 682          *              to the $audience parameter
 683          * @return String|false The text of the current revision
 684          * @deprecated as of 1.21, getContent() should be used instead.
 685          */
 686         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo deprecated, replace usage!
 687                 ContentHandler::deprecated( __METHOD__, '1.21' );
 688
 689                 $this->loadLastEdit();
 690                 if ( $this->mLastRevision ) {
 691                         return $this->mLastRevision->getText( $audience, $user );
 692                 }
 693                 return false;
 694         }
 695
 696         /**
 697          * Get the text of the current revision. No side-effects...
 698          *
 699          * @return String|bool The text of the current revision. False on failure
 700          * @deprecated as of 1.21, getContent() should be used instead.
 701          */
 702         public function getRawText() {
 703                 ContentHandler::deprecated( __METHOD__, '1.21' );
 704
 705                 return $this->getText( Revision::RAW );
 706         }
 707
 708         /**
 709          * @return string MW timestamp of last article revision
 710          */
 711         public function getTimestamp() {
 712                 // Check if the field has been filled by WikiPage::setTimestamp()
 713                 if ( !$this->mTimestamp ) {
 714                         $this->loadLastEdit();
 715                 }
 716
 717                 return wfTimestamp( TS_MW, $this->mTimestamp );
 718         }
 719
 720         /**
 721          * Set the page timestamp (use only to avoid DB queries)
 722          * @param string $ts MW timestamp of last article revision
 723          * @return void
 724          */
 725         public function setTimestamp( $ts ) {
 726                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 727         }
 728
 729         /**
 730          * @param $audience Integer: one of:
 731          *      Revision::FOR_PUBLIC       to be displayed to all users
 732          *      Revision::FOR_THIS_USER    to be displayed to the given user
 733          *      Revision::RAW              get the text regardless of permissions
 734          * @param $user User object to check for, only if FOR_THIS_USER is passed
 735          *              to the $audience parameter
 736          * @return int user ID for the user that made the last article revision
 737          */
 738         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 739                 $this->loadLastEdit();
 740                 if ( $this->mLastRevision ) {
 741                         return $this->mLastRevision->getUser( $audience, $user );
 742                 } else {
 743                         return -1;
 744                 }
 745         }
 746
 747         /**
 748          * Get the User object of the user who created the page
 749          * @param $audience Integer: one of:
 750          *      Revision::FOR_PUBLIC       to be displayed to all users
 751          *      Revision::FOR_THIS_USER    to be displayed to the given user
 752          *      Revision::RAW              get the text regardless of permissions
 753          * @param $user User object to check for, only if FOR_THIS_USER is passed
 754          *              to the $audience parameter
 755          * @return User|null
 756          */
 757         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 758                 $revision = $this->getOldestRevision();
 759                 if ( $revision ) {
 760                         $userName = $revision->getUserText( $audience, $user );
 761                         return User::newFromName( $userName, false );
 762                 } else {
 763                         return null;
 764                 }
 765         }
 766
 767         /**
 768          * @param $audience Integer: one of:
 769          *      Revision::FOR_PUBLIC       to be displayed to all users
 770          *      Revision::FOR_THIS_USER    to be displayed to the given user
 771          *      Revision::RAW              get the text regardless of permissions
 772          * @param $user User object to check for, only if FOR_THIS_USER is passed
 773          *              to the $audience parameter
 774          * @return string username of the user that made the last article revision
 775          */
 776         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 777                 $this->loadLastEdit();
 778                 if ( $this->mLastRevision ) {
 779                         return $this->mLastRevision->getUserText( $audience, $user );
 780                 } else {
 781                         return '';
 782                 }
 783         }
 784
 785         /**
 786          * @param $audience Integer: one of:
 787          *      Revision::FOR_PUBLIC       to be displayed to all users
 788          *      Revision::FOR_THIS_USER    to be displayed to the given user
 789          *      Revision::RAW              get the text regardless of permissions
 790          * @param $user User object to check for, only if FOR_THIS_USER is passed
 791          *              to the $audience parameter
 792          * @return string Comment stored for the last article revision
 793          */
 794         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 795                 $this->loadLastEdit();
 796                 if ( $this->mLastRevision ) {
 797                         return $this->mLastRevision->getComment( $audience, $user );
 798                 } else {
 799                         return '';
 800                 }
 801         }
 802
 803         /**
 804          * Returns true if last revision was marked as "minor edit"
 805          *
 806          * @return boolean Minor edit indicator for the last article revision.
 807          */
 808         public function getMinorEdit() {
 809                 $this->loadLastEdit();
 810                 if ( $this->mLastRevision ) {
 811                         return $this->mLastRevision->isMinor();
 812                 } else {
 813                         return false;
 814                 }
 815         }
 816
 817         /**
 818          * Get the cached timestamp for the last time the page changed.
 819          * This is only used to help handle slave lag by comparing to page_touched.
 820          * @return string MW timestamp
 821          */
 822         protected function getCachedLastEditTime() {
 823                 global $wgMemc;
 824                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 825                 return $wgMemc->get( $key );
 826         }
 827
 828         /**
 829          * Set the cached timestamp for the last time the page changed.
 830          * This is only used to help handle slave lag by comparing to page_touched.
 831          * @param $timestamp string
 832          * @return void
 833          */
 834         public function setCachedLastEditTime( $timestamp ) {
 835                 global $wgMemc;
 836                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 837                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 838         }
 839
 840         /**
 841          * Determine whether a page would be suitable for being counted as an
 842          * article in the site_stats table based on the title & its content
 843          *
 844          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 845          *        if false, the current database state will be used
 846          * @return Boolean
 847          */
 848         public function isCountable( $editInfo = false ) {
 849                 global $wgArticleCountMethod;
 850
 851                 if ( !$this->mTitle->isContentPage() ) {
 852                         return false;
 853                 }
 854
 855                 if ( $editInfo ) {
 856                         $content = $editInfo->pstContent;
 857                 } else {
 858                         $content = $this->getContent();
 859                 }
 860
 861                 if ( !$content || $content->isRedirect() ) {
 862                         return false;
 863                 }
 864
 865                 $hasLinks = null;
 866
 867                 if ( $wgArticleCountMethod === 'link' ) {
 868                         // nasty special case to avoid re-parsing to detect links
 869
 870                         if ( $editInfo ) {
 871                                 // ParserOutput::getLinks() is a 2D array of page links, so
 872                                 // to be really correct we would need to recurse in the array
 873                                 // but the main array should only have items in it if there are
 874                                 // links.
 875                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 876                         } else {
 877                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 878                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 879                         }
 880                 }
 881
 882                 return $content->isCountable( $hasLinks );
 883         }
 884
 885         /**
 886          * If this page is a redirect, get its target
 887          *
 888          * The target will be fetched from the redirect table if possible.
 889          * If this page doesn't have an entry there, call insertRedirect()
 890          * @return Title|mixed object, or null if this page is not a redirect
 891          */
 892         public function getRedirectTarget() {
 893                 if ( !$this->mTitle->isRedirect() ) {
 894                         return null;
 895                 }
 896
 897                 if ( $this->mRedirectTarget !== null ) {
 898                         return $this->mRedirectTarget;
 899                 }
 900
 901                 // Query the redirect table
 902                 $dbr = wfGetDB( DB_SLAVE );
 903                 $row = $dbr->selectRow( 'redirect',
 904                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 905                         array( 'rd_from' => $this->getId() ),
 906                         __METHOD__
 907                 );
 908
 909                 // rd_fragment and rd_interwiki were added later, populate them if empty
 910                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 911                         $this->mRedirectTarget = Title::makeTitle(
 912                                 $row->rd_namespace, $row->rd_title,
 913                                 $row->rd_fragment, $row->rd_interwiki );
 914                         return $this->mRedirectTarget;
 915                 }
 916
 917                 // This page doesn't have an entry in the redirect table
 918                 $this->mRedirectTarget = $this->insertRedirect();
 919                 return $this->mRedirectTarget;
 920         }
 921
 922         /**
 923          * Insert an entry for this page into the redirect table.
 924          *
 925          * Don't call this function directly unless you know what you're doing.
 926          * @return Title object or null if not a redirect
 927          */
 928         public function insertRedirect() {
 929                 // recurse through to only get the final target
 930                 $content = $this->getContent();
 931                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 932                 if ( !$retval ) {
 933                         return null;
 934                 }
 935                 $this->insertRedirectEntry( $retval );
 936                 return $retval;
 937         }
 938
 939         /**
 940          * Insert or update the redirect table entry for this page to indicate
 941          * it redirects to $rt .
 942          * @param $rt Title redirect target
 943          */
 944         public function insertRedirectEntry( $rt ) {
 945                 $dbw = wfGetDB( DB_MASTER );
 946                 $dbw->replace( 'redirect', array( 'rd_from' ),
 947                         array(
 948                                 'rd_from' => $this->getId(),
 949                                 'rd_namespace' => $rt->getNamespace(),
 950                                 'rd_title' => $rt->getDBkey(),
 951                                 'rd_fragment' => $rt->getFragment(),
 952                                 'rd_interwiki' => $rt->getInterwiki(),
 953                         ),
 954                         __METHOD__
 955                 );
 956         }
 957
 958         /**
 959          * Get the Title object or URL this page redirects to
 960          *
 961          * @return mixed false, Title of in-wiki target, or string with URL
 962          */
 963         public function followRedirect() {
 964                 return $this->getRedirectURL( $this->getRedirectTarget() );
 965         }
 966
 967         /**
 968          * Get the Title object or URL to use for a redirect. We use Title
 969          * objects for same-wiki, non-special redirects and URLs for everything
 970          * else.
 971          * @param $rt Title Redirect target
 972          * @return mixed false, Title object of local target, or string with URL
 973          */
 974         public function getRedirectURL( $rt ) {
 975                 if ( !$rt ) {
 976                         return false;
 977                 }
 978
 979                 if ( $rt->isExternal() ) {
 980                         if ( $rt->isLocal() ) {
 981                                 // Offsite wikis need an HTTP redirect.
 982                                 //
 983                                 // This can be hard to reverse and may produce loops,
 984                                 // so they may be disabled in the site configuration.
 985                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 986                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 987                         } else {
 988                                 // External pages pages without "local" bit set are not valid
 989                                 // redirect targets
 990                                 return false;
 991                         }
 992                 }
 993
 994                 if ( $rt->isSpecialPage() ) {
 995                         // Gotta handle redirects to special pages differently:
 996                         // Fill the HTTP response "Location" header and ignore
 997                         // the rest of the page we're on.
 998                         //
 999                         // Some pages are not valid targets
1000                         if ( $rt->isValidRedirectTarget() ) {
1001                                 return $rt->getFullURL();
1002                         } else {
1003                                 return false;
1004                         }
1005                 }
1006
1007                 return $rt;
1008         }
1009
1010         /**
1011          * Get a list of users who have edited this article, not including the user who made
1012          * the most recent revision, which you can get from $article->getUser() if you want it
1013          * @return UserArrayFromResult
1014          */
1015         public function getContributors() {
1016                 // @todo FIXME: This is expensive; cache this info somewhere.
1017
1018                 $dbr = wfGetDB( DB_SLAVE );
1019
1020                 if ( $dbr->implicitGroupby() ) {
1021                         $realNameField = 'user_real_name';
1022                 } else {
1023                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1024                 }
1025
1026                 $tables = array( 'revision', 'user' );
1027
1028                 $fields = array(
1029                         'user_id' => 'rev_user',
1030                         'user_name' => 'rev_user_text',
1031                         $realNameField,
1032                         'timestamp' => 'MAX(rev_timestamp)',
1033                 );
1034
1035                 $conds = array( 'rev_page' => $this->getId() );
1036
1037                 // The user who made the top revision gets credited as "this page was last edited by
1038                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1039                 $user = $this->getUser();
1040                 if ( $user ) {
1041                         $conds[] = "rev_user != $user";
1042                 } else {
1043                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1044                 }
1045
1046                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1047
1048                 $jconds = array(
1049                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1050                 );
1051
1052                 $options = array(
1053                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1054                         'ORDER BY' => 'timestamp DESC',
1055                 );
1056
1057                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1058                 return new UserArrayFromResult( $res );
1059         }
1060
1061         /**
1062          * Get the last N authors
1063          * @param int $num Number of revisions to get
1064          * @param int|string $revLatest the latest rev_id, selected from the master (optional)
1065          * @return array Array of authors, duplicates not removed
1066          */
1067         public function getLastNAuthors( $num, $revLatest = 0 ) {
1068                 wfProfileIn( __METHOD__ );
1069                 // First try the slave
1070                 // If that doesn't have the latest revision, try the master
1071                 $continue = 2;
1072                 $db = wfGetDB( DB_SLAVE );
1073
1074                 do {
1075                         $res = $db->select( array( 'page', 'revision' ),
1076                                 array( 'rev_id', 'rev_user_text' ),
1077                                 array(
1078                                         'page_namespace' => $this->mTitle->getNamespace(),
1079                                         'page_title' => $this->mTitle->getDBkey(),
1080                                         'rev_page = page_id'
1081                                 ), __METHOD__,
1082                                 array(
1083                                         'ORDER BY' => 'rev_timestamp DESC',
1084                                         'LIMIT' => $num
1085                                 )
1086                         );
1087
1088                         if ( !$res ) {
1089                                 wfProfileOut( __METHOD__ );
1090                                 return array();
1091                         }
1092
1093                         $row = $db->fetchObject( $res );
1094
1095                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1096                                 $db = wfGetDB( DB_MASTER );
1097                                 $continue--;
1098                         } else {
1099                                 $continue = 0;
1100                         }
1101                 } while ( $continue );
1102
1103                 $authors = array( $row->rev_user_text );
1104
1105                 foreach ( $res as $row ) {
1106                         $authors[] = $row->rev_user_text;
1107                 }
1108
1109                 wfProfileOut( __METHOD__ );
1110                 return $authors;
1111         }
1112
1113         /**
1114          * Should the parser cache be used?
1115          *
1116          * @param $parserOptions ParserOptions to check
1117          * @param $oldid int
1118          * @return boolean
1119          */
1120         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1121                 global $wgEnableParserCache;
1122
1123                 return $wgEnableParserCache
1124                         && $parserOptions->getStubThreshold() == 0
1125                         && $this->exists()
1126                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1127                         && $this->getContentHandler()->isParserCacheSupported();
1128         }
1129
1130         /**
1131          * Get a ParserOutput for the given ParserOptions and revision ID.
1132          * The parser cache will be used if possible.
1133          *
1134          * @since 1.19
1135          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1136          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1137          *               get the current revision (default value)
1138          *
1139          * @return ParserOutput or false if the revision was not found
1140          */
1141         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1142                 wfProfileIn( __METHOD__ );
1143
1144                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1145                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1146                 if ( $parserOptions->getStubThreshold() ) {
1147                         wfIncrStats( 'pcache_miss_stub' );
1148                 }
1149
1150                 if ( $useParserCache ) {
1151                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1152                         if ( $parserOutput !== false ) {
1153                                 wfProfileOut( __METHOD__ );
1154                                 return $parserOutput;
1155                         }
1156                 }
1157
1158                 if ( $oldid === null || $oldid === 0 ) {
1159                         $oldid = $this->getLatest();
1160                 }
1161
1162                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1163                 $pool->execute();
1164
1165                 wfProfileOut( __METHOD__ );
1166
1167                 return $pool->getParserOutput();
1168         }
1169
1170         /**
1171          * Do standard deferred updates after page view
1172          * @param User $user The relevant user
1173          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1174          */
1175         public function doViewUpdates( User $user, $oldid = 0 ) {
1176                 global $wgDisableCounters;
1177                 if ( wfReadOnly() ) {
1178                         return;
1179                 }
1180
1181                 // Don't update page view counters on views from bot users (bug 14044)
1182                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1183                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1184                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1185                 }
1186
1187                 // Update newtalk / watchlist notification status
1188                 $user->clearNotification( $this->mTitle, $oldid );
1189         }
1190
1191         /**
1192          * Perform the actions of a page purging
1193          * @return bool
1194          */
1195         public function doPurge() {
1196                 global $wgUseSquid;
1197
1198                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1199                         return false;
1200                 }
1201
1202                 // Invalidate the cache
1203                 $this->mTitle->invalidateCache();
1204
1205                 if ( $wgUseSquid ) {
1206                         // Commit the transaction before the purge is sent
1207                         $dbw = wfGetDB( DB_MASTER );
1208                         $dbw->commit( __METHOD__ );
1209
1210                         // Send purge
1211                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1212                         $update->doUpdate();
1213                 }
1214
1215                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1216                         // @todo move this logic to MessageCache
1217
1218                         if ( $this->exists() ) {
1219                                 // NOTE: use transclusion text for messages.
1220                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1221
1222                                 $content = $this->getContent();
1223                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1224
1225                                 if ( $text === null ) {
1226                                         $text = false;
1227                                 }
1228                         } else {
1229                                 $text = false;
1230                         }
1231
1232                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1233                 }
1234                 return true;
1235         }
1236
1237         /**
1238          * Insert a new empty page record for this article.
1239          * This *must* be followed up by creating a revision
1240          * and running $this->updateRevisionOn( ... );
1241          * or else the record will be left in a funky state.
1242          * Best if all done inside a transaction.
1243          *
1244          * @param $dbw DatabaseBase
1245          * @return int The newly created page_id key, or false if the title already existed
1246          */
1247         public function insertOn( $dbw ) {
1248                 wfProfileIn( __METHOD__ );
1249
1250                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1251                 $dbw->insert( 'page', array(
1252                         'page_id'           => $page_id,
1253                         'page_namespace'    => $this->mTitle->getNamespace(),
1254                         'page_title'        => $this->mTitle->getDBkey(),
1255                         'page_counter'      => 0,
1256                         'page_restrictions' => '',
1257                         'page_is_redirect'  => 0, // Will set this shortly...
1258                         'page_is_new'       => 1,
1259                         'page_random'       => wfRandom(),
1260                         'page_touched'      => $dbw->timestamp(),
1261                         'page_latest'       => 0, // Fill this in shortly...
1262                         'page_len'          => 0, // Fill this in shortly...
1263                 ), __METHOD__, 'IGNORE' );
1264
1265                 $affected = $dbw->affectedRows();
1266
1267                 if ( $affected ) {
1268                         $newid = $dbw->insertId();
1269                         $this->mId = $newid;
1270                         $this->mTitle->resetArticleID( $newid );
1271                 }
1272                 wfProfileOut( __METHOD__ );
1273
1274                 return $affected ? $newid : false;
1275         }
1276
1277         /**
1278          * Update the page record to point to a newly saved revision.
1279          *
1280          * @param $dbw DatabaseBase: object
1281          * @param $revision Revision: For ID number, and text used to set
1282          *                  length and redirect status fields
1283          * @param $lastRevision Integer: if given, will not overwrite the page field
1284          *                      when different from the currently set value.
1285          *                      Giving 0 indicates the new page flag should be set
1286          *                      on.
1287          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1288          *                           removing rows in redirect table.
1289          * @return bool true on success, false on failure
1290          * @private
1291          */
1292         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1293                 global $wgContentHandlerUseDB;
1294
1295                 wfProfileIn( __METHOD__ );
1296
1297                 $content = $revision->getContent();
1298                 $len = $content ? $content->getSize() : 0;
1299                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1300
1301                 $conditions = array( 'page_id' => $this->getId() );
1302
1303                 if ( !is_null( $lastRevision ) ) {
1304                         // An extra check against threads stepping on each other
1305                         $conditions['page_latest'] = $lastRevision;
1306                 }
1307
1308                 $now = wfTimestampNow();
1309                 $row = array( /* SET */
1310                         'page_latest'      => $revision->getId(),
1311                         'page_touched'     => $dbw->timestamp( $now ),
1312                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1313                         'page_is_redirect' => $rt !== null ? 1 : 0,
1314                         'page_len'         => $len,
1315                 );
1316
1317                 if ( $wgContentHandlerUseDB ) {
1318                         $row['page_content_model'] = $revision->getContentModel();
1319                 }
1320
1321                 $dbw->update( 'page',
1322                         $row,
1323                         $conditions,
1324                         __METHOD__ );
1325
1326                 $result = $dbw->affectedRows() > 0;
1327                 if ( $result ) {
1328                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1329                         $this->setLastEdit( $revision );
1330                         $this->setCachedLastEditTime( $now );
1331                         $this->mLatest = $revision->getId();
1332                         $this->mIsRedirect = (bool)$rt;
1333                         // Update the LinkCache.
1334                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1335                                                                                                         $this->mLatest, $revision->getContentModel() );
1336                 }
1337
1338                 wfProfileOut( __METHOD__ );
1339                 return $result;
1340         }
1341
1342         /**
1343          * Add row to the redirect table if this is a redirect, remove otherwise.
1344          *
1345          * @param $dbw DatabaseBase
1346          * @param $redirectTitle Title object pointing to the redirect target,
1347          *                       or NULL if this is not a redirect
1348          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1349          *                           removing rows in redirect table.
1350          * @return bool true on success, false on failure
1351          * @private
1352          */
1353         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1354                 // Always update redirects (target link might have changed)
1355                 // Update/Insert if we don't know if the last revision was a redirect or not
1356                 // Delete if changing from redirect to non-redirect
1357                 $isRedirect = !is_null( $redirectTitle );
1358
1359                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1360                         return true;
1361                 }
1362
1363                 wfProfileIn( __METHOD__ );
1364                 if ( $isRedirect ) {
1365                         $this->insertRedirectEntry( $redirectTitle );
1366                 } else {
1367                         // This is not a redirect, remove row from redirect table
1368                         $where = array( 'rd_from' => $this->getId() );
1369                         $dbw->delete( 'redirect', $where, __METHOD__ );
1370                 }
1371
1372                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1373                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1374                 }
1375                 wfProfileOut( __METHOD__ );
1376
1377                 return ( $dbw->affectedRows() != 0 );
1378         }
1379
1380         /**
1381          * If the given revision is newer than the currently set page_latest,
1382          * update the page record. Otherwise, do nothing.
1383          *
1384          * @param $dbw DatabaseBase object
1385          * @param $revision Revision object
1386          * @return mixed
1387          */
1388         public function updateIfNewerOn( $dbw, $revision ) {
1389                 wfProfileIn( __METHOD__ );
1390
1391                 $row = $dbw->selectRow(
1392                         array( 'revision', 'page' ),
1393                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1394                         array(
1395                                 'page_id' => $this->getId(),
1396                                 'page_latest=rev_id' ),
1397                         __METHOD__ );
1398
1399                 if ( $row ) {
1400                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1401                                 wfProfileOut( __METHOD__ );
1402                                 return false;
1403                         }
1404                         $prev = $row->rev_id;
1405                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1406                 } else {
1407                         // No or missing previous revision; mark the page as new
1408                         $prev = 0;
1409                         $lastRevIsRedirect = null;
1410                 }
1411
1412                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1413
1414                 wfProfileOut( __METHOD__ );
1415                 return $ret;
1416         }
1417
1418         /**
1419          * Get the content that needs to be saved in order to undo all revisions
1420          * between $undo and $undoafter. Revisions must belong to the same page,
1421          * must exist and must not be deleted
1422          * @param $undo Revision
1423          * @param $undoafter Revision Must be an earlier revision than $undo
1424          * @return mixed string on success, false on failure
1425          * @since 1.21
1426          * Before we had the Content object, this was done in getUndoText
1427          */
1428         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1429                 $handler = $undo->getContentHandler();
1430                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1431         }
1432
1433         /**
1434          * Get the text that needs to be saved in order to undo all revisions
1435          * between $undo and $undoafter. Revisions must belong to the same page,
1436          * must exist and must not be deleted
1437          * @param $undo Revision
1438          * @param $undoafter Revision Must be an earlier revision than $undo
1439          * @return mixed string on success, false on failure
1440          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1441          */
1442         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1443                 ContentHandler::deprecated( __METHOD__, '1.21' );
1444
1445                 $this->loadLastEdit();
1446
1447                 if ( $this->mLastRevision ) {
1448                         if ( is_null( $undoafter ) ) {
1449                                 $undoafter = $undo->getPrevious();
1450                         }
1451
1452                         $handler = $this->getContentHandler();
1453                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1454
1455                         if ( !$undone ) {
1456                                 return false;
1457                         } else {
1458                                 return ContentHandler::getContentText( $undone );
1459                         }
1460                 }
1461
1462                 return false;
1463         }
1464
1465         /**
1466          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1467          * @param string $text new text of the section
1468          * @param string $sectionTitle new section's subject, only if $section is 'new'
1469          * @param string $edittime revision timestamp or null to use the current revision
1470          * @throws MWException
1471          * @return String new complete article text, or null if error
1472          *
1473          * @deprecated since 1.21, use replaceSectionContent() instead
1474          */
1475         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1476                 ContentHandler::deprecated( __METHOD__, '1.21' );
1477
1478                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1479                         // Whole-page edit; let the whole text through
1480                         return $text;
1481                 }
1482
1483                 if ( !$this->supportsSections() ) {
1484                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1485                 }
1486
1487                 // could even make section title, but that's not required.
1488                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1489
1490                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1491
1492                 return ContentHandler::getContentText( $newContent );
1493         }
1494
1495         /**
1496          * Returns true if this page's content model supports sections.
1497          *
1498          * @return boolean whether sections are supported.
1499          *
1500          * @todo The skin should check this and not offer section functionality if sections are not supported.
1501          * @todo The EditPage should check this and not offer section functionality if sections are not supported.
1502          */
1503         public function supportsSections() {
1504                 return $this->getContentHandler()->supportsSections();
1505         }
1506
1507         /**
1508          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1509          * @param $sectionContent Content: new content of the section
1510          * @param string $sectionTitle new section's subject, only if $section is 'new'
1511          * @param string $edittime revision timestamp or null to use the current revision
1512          *
1513          * @throws MWException
1514          * @return Content new complete article content, or null if error
1515          *
1516          * @since 1.21
1517          */
1518         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1519                 wfProfileIn( __METHOD__ );
1520
1521                 if ( strval( $section ) == '' ) {
1522                         // Whole-page edit; let the whole text through
1523                         $newContent = $sectionContent;
1524                 } else {
1525                         if ( !$this->supportsSections() ) {
1526                                 wfProfileOut( __METHOD__ );
1527                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1528                         }
1529
1530                         // Bug 30711: always use current version when adding a new section
1531                         if ( is_null( $edittime ) || $section == 'new' ) {
1532                                 $oldContent = $this->getContent();
1533                         } else {
1534                                 $dbw = wfGetDB( DB_MASTER );
1535                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1536
1537                                 if ( !$rev ) {
1538                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1539                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1540                                         wfProfileOut( __METHOD__ );
1541                                         return null;
1542                                 }
1543
1544                                 $oldContent = $rev->getContent();
1545                         }
1546
1547                         if ( ! $oldContent ) {
1548                                 wfDebug( __METHOD__ . ": no page text\n" );
1549                                 wfProfileOut( __METHOD__ );
1550                                 return null;
1551                         }
1552
1553                         // FIXME: $oldContent might be null?
1554                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1555                 }
1556
1557                 wfProfileOut( __METHOD__ );
1558                 return $newContent;
1559         }
1560
1561         /**
1562          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1563          * @param $flags Int
1564          * @return Int updated $flags
1565          */
1566         function checkFlags( $flags ) {
1567                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1568                         if ( $this->exists() ) {
1569                                 $flags |= EDIT_UPDATE;
1570                         } else {
1571                                 $flags |= EDIT_NEW;
1572                         }
1573                 }
1574
1575                 return $flags;
1576         }
1577
1578         /**
1579          * Change an existing article or create a new article. Updates RC and all necessary caches,
1580          * optionally via the deferred update array.
1581          *
1582          * @param string $text new text
1583          * @param string $summary edit summary
1584          * @param $flags Integer bitfield:
1585          *      EDIT_NEW
1586          *          Article is known or assumed to be non-existent, create a new one
1587          *      EDIT_UPDATE
1588          *          Article is known or assumed to be pre-existing, update it
1589          *      EDIT_MINOR
1590          *          Mark this edit minor, if the user is allowed to do so
1591          *      EDIT_SUPPRESS_RC
1592          *          Do not log the change in recentchanges
1593          *      EDIT_FORCE_BOT
1594          *          Mark the edit a "bot" edit regardless of user rights
1595          *      EDIT_DEFER_UPDATES
1596          *          Defer some of the updates until the end of index.php
1597          *      EDIT_AUTOSUMMARY
1598          *          Fill in blank summaries with generated text where possible
1599          *
1600          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1601          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1602          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1603          * edit-already-exists error will be returned. These two conditions are also possible with
1604          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1605          *
1606          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1607          * @param $user User the user doing the edit
1608          *
1609          * @throws MWException
1610          * @return Status object. Possible errors:
1611          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1612          *     edit-gone-missing:       In update mode, but the article didn't exist
1613          *     edit-conflict:           In update mode, the article changed unexpectedly
1614          *     edit-no-change:          Warning that the text was the same as before
1615          *     edit-already-exists:     In creation mode, but the article already exists
1616          *
1617          *  Extensions may define additional errors.
1618          *
1619          *  $return->value will contain an associative array with members as follows:
1620          *     new:                     Boolean indicating if the function attempted to create a new article
1621          *     revision:                The revision object for the inserted revision, or null
1622          *
1623          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1624          *
1625          * @deprecated since 1.21: use doEditContent() instead.
1626          */
1627         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1628                 ContentHandler::deprecated( __METHOD__, '1.21' );
1629
1630                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1631
1632                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1633         }
1634
1635         /**
1636          * Change an existing article or create a new article. Updates RC and all necessary caches,
1637          * optionally via the deferred update array.
1638          *
1639          * @param $content Content: new content
1640          * @param string $summary edit summary
1641          * @param $flags Integer bitfield:
1642          *      EDIT_NEW
1643          *          Article is known or assumed to be non-existent, create a new one
1644          *      EDIT_UPDATE
1645          *          Article is known or assumed to be pre-existing, update it
1646          *      EDIT_MINOR
1647          *          Mark this edit minor, if the user is allowed to do so
1648          *      EDIT_SUPPRESS_RC
1649          *          Do not log the change in recentchanges
1650          *      EDIT_FORCE_BOT
1651          *          Mark the edit a "bot" edit regardless of user rights
1652          *      EDIT_DEFER_UPDATES
1653          *          Defer some of the updates until the end of index.php
1654          *      EDIT_AUTOSUMMARY
1655          *          Fill in blank summaries with generated text where possible
1656          *
1657          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1658          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1659          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1660          * edit-already-exists error will be returned. These two conditions are also possible with
1661          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1662          *
1663          * @param bool|int $baseRevId the revision ID this edit was based off, if any
1664          * @param $user User the user doing the edit
1665          * @param $serialisation_format String: format for storing the content in the database
1666          *
1667          * @throws MWException
1668          * @return Status object. Possible errors:
1669          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1670          *     edit-gone-missing:       In update mode, but the article didn't exist
1671          *     edit-conflict:           In update mode, the article changed unexpectedly
1672          *     edit-no-change:          Warning that the text was the same as before
1673          *     edit-already-exists:     In creation mode, but the article already exists
1674          *
1675          *  Extensions may define additional errors.
1676          *
1677          *  $return->value will contain an associative array with members as follows:
1678          *     new:                     Boolean indicating if the function attempted to create a new article
1679          *     revision:                The revision object for the inserted revision, or null
1680          *
1681          * @since 1.21
1682          */
1683         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1684                 User $user = null, $serialisation_format = null
1685         ) {
1686                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1687
1688                 // Low-level sanity check
1689                 if ( $this->mTitle->getText() === '' ) {
1690                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1691                 }
1692
1693                 wfProfileIn( __METHOD__ );
1694
1695                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1696                         wfProfileOut( __METHOD__ );
1697                         return Status::newFatal( 'content-not-allowed-here',
1698                                 ContentHandler::getLocalizedName( $content->getModel() ),
1699                                 $this->getTitle()->getPrefixedText() );
1700                 }
1701
1702                 $user = is_null( $user ) ? $wgUser : $user;
1703                 $status = Status::newGood( array() );
1704
1705                 // Load the data from the master database if needed.
1706                 // The caller may already loaded it from the master or even loaded it using
1707                 // SELECT FOR UPDATE, so do not override that using clear().
1708                 $this->loadPageData( 'fromdbmaster' );
1709
1710                 $flags = $this->checkFlags( $flags );
1711
1712                 // handle hook
1713                 $hook_args = array( &$this, &$user, &$content, &$summary,
1714                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1715
1716                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1717                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1718
1719                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1720
1721                         if ( $status->isOK() ) {
1722                                 $status->fatal( 'edit-hook-aborted' );
1723                         }
1724
1725                         wfProfileOut( __METHOD__ );
1726                         return $status;
1727                 }
1728
1729                 // Silently ignore EDIT_MINOR if not allowed
1730                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1731                 $bot = $flags & EDIT_FORCE_BOT;
1732
1733                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1734
1735                 $oldsize = $old_content ? $old_content->getSize() : 0;
1736                 $oldid = $this->getLatest();
1737                 $oldIsRedirect = $this->isRedirect();
1738                 $oldcountable = $this->isCountable();
1739
1740                 $handler = $content->getContentHandler();
1741
1742                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1743                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1744                         if ( !$old_content ) {
1745                                 $old_content = null;
1746                         }
1747                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1748                 }
1749
1750                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1751                 $serialized = $editInfo->pst;
1752
1753                 /**
1754                  * @var Content $content
1755                  */
1756                 $content = $editInfo->pstContent;
1757                 $newsize = $content->getSize();
1758
1759                 $dbw = wfGetDB( DB_MASTER );
1760                 $now = wfTimestampNow();
1761                 $this->mTimestamp = $now;
1762
1763                 if ( $flags & EDIT_UPDATE ) {
1764                         // Update article, but only if changed.
1765                         $status->value['new'] = false;
1766
1767                         if ( !$oldid ) {
1768                                 // Article gone missing
1769                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1770                                 $status->fatal( 'edit-gone-missing' );
1771
1772                                 wfProfileOut( __METHOD__ );
1773                                 return $status;
1774                         } elseif ( !$old_content ) {
1775                                 // Sanity check for bug 37225
1776                                 wfProfileOut( __METHOD__ );
1777                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1778                         }
1779
1780                         $revision = new Revision( array(
1781                                 'page'       => $this->getId(),
1782                                 'title'      => $this->getTitle(), // for determining the default content model
1783                                 'comment'    => $summary,
1784                                 'minor_edit' => $isminor,
1785                                 'text'       => $serialized,
1786                                 'len'        => $newsize,
1787                                 'parent_id'  => $oldid,
1788                                 'user'       => $user->getId(),
1789                                 'user_text'  => $user->getName(),
1790                                 'timestamp'  => $now,
1791                                 'content_model' => $content->getModel(),
1792                                 'content_format' => $serialisation_format,
1793                         ) ); // XXX: pass content object?!
1794
1795                         $changed = !$content->equals( $old_content );
1796
1797                         if ( $changed ) {
1798                                 if ( !$content->isValid() ) {
1799                                         wfProfileOut( __METHOD__ );
1800                                         throw new MWException( "New content failed validity check!" );
1801                                 }
1802
1803                                 $dbw->begin( __METHOD__ );
1804
1805                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1806                                 $status->merge( $prepStatus );
1807
1808                                 if ( !$status->isOK() ) {
1809                                         $dbw->rollback( __METHOD__ );
1810
1811                                         wfProfileOut( __METHOD__ );
1812                                         return $status;
1813                                 }
1814
1815                                 $revisionId = $revision->insertOn( $dbw );
1816
1817                                 // Update page
1818                                 //
1819                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1820                                 // during the course of this function. This makes sure that EditPage can detect
1821                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1822                                 // before this function is called. A previous function used a separate query, this
1823                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1824                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1825
1826                                 if ( !$ok ) {
1827                                         // Belated edit conflict! Run away!!
1828                                         $status->fatal( 'edit-conflict' );
1829
1830                                         $dbw->rollback( __METHOD__ );
1831
1832                                         wfProfileOut( __METHOD__ );
1833                                         return $status;
1834                                 }
1835
1836                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1837                                 // Update recentchanges
1838                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1839                                         // Mark as patrolled if the user can do so
1840                                         $patrolled = $wgUseRCPatrol && !count(
1841                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1842                                         // Add RC row to the DB
1843                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1844                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1845                                                 $revisionId, $patrolled
1846                                         );
1847
1848                                         // Log auto-patrolled edits
1849                                         if ( $patrolled ) {
1850                                                 PatrolLog::record( $rc, true, $user );
1851                                         }
1852                                 }
1853                                 $user->incEditCount();
1854                                 $dbw->commit( __METHOD__ );
1855                         } else {
1856                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1857                                 // related variables correctly
1858                                 $revision->setId( $this->getLatest() );
1859                         }
1860
1861                         // Update links tables, site stats, etc.
1862                         $this->doEditUpdates(
1863                                 $revision,
1864                                 $user,
1865                                 array(
1866                                         'changed' => $changed,
1867                                         'oldcountable' => $oldcountable
1868                                 )
1869                         );
1870
1871                         if ( !$changed ) {
1872                                 $status->warning( 'edit-no-change' );
1873                                 $revision = null;
1874                                 // Update page_touched, this is usually implicit in the page update
1875                                 // Other cache updates are done in onArticleEdit()
1876                                 $this->mTitle->invalidateCache();
1877                         }
1878                 } else {
1879                         // Create new article
1880                         $status->value['new'] = true;
1881
1882                         $dbw->begin( __METHOD__ );
1883
1884                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1885                         $status->merge( $prepStatus );
1886
1887                         if ( !$status->isOK() ) {
1888                                 $dbw->rollback( __METHOD__ );
1889
1890                                 wfProfileOut( __METHOD__ );
1891                                 return $status;
1892                         }
1893
1894                         $status->merge( $prepStatus );
1895
1896                         // Add the page record; stake our claim on this title!
1897                         // This will return false if the article already exists
1898                         $newid = $this->insertOn( $dbw );
1899
1900                         if ( $newid === false ) {
1901                                 $dbw->rollback( __METHOD__ );
1902                                 $status->fatal( 'edit-already-exists' );
1903
1904                                 wfProfileOut( __METHOD__ );
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' => $serialisation_format,
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                         wfRunHooks( '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                         $dbw->commit( __METHOD__ );
1952
1953                         // Update links, etc.
1954                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1955
1956                         $hook_args = array( &$this, &$user, $content, $summary,
1957                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1958
1959                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1960                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1961                 }
1962
1963                 // Do updates right now unless deferral was requested
1964                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1965                         DeferredUpdates::doUpdates();
1966                 }
1967
1968                 // Return the new revision (or null) to the caller
1969                 $status->value['revision'] = $revision;
1970
1971                 $hook_args = array( &$this, &$user, $content, $summary,
1972                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1973
1974                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1975                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1976
1977                 // Promote user to any groups they meet the criteria for
1978                 $user->addAutopromoteOnceGroups( 'onEdit' );
1979
1980                 wfProfileOut( __METHOD__ );
1981                 return $status;
1982         }
1983
1984         /**
1985          * Get parser options suitable for rendering the primary article wikitext
1986          *
1987          * @see ContentHandler::makeParserOptions
1988          *
1989          * @param IContextSource|User|string $context One of the following:
1990          *        - IContextSource: Use the User and the Language of the provided
1991          *          context
1992          *        - User: Use the provided User object and $wgLang for the language,
1993          *          so use an IContextSource object if possible.
1994          *        - 'canonical': Canonical options (anonymous user with default
1995          *          preferences and content language).
1996          * @return ParserOptions
1997          */
1998         public function makeParserOptions( $context ) {
1999                 $options = $this->getContentHandler()->makeParserOptions( $context );
2000
2001                 if ( $this->getTitle()->isConversionTable() ) {
2002                         // @todo ConversionTable should become a separate content model, so we don't need special cases like this one.
2003                         $options->disableContentConversion();
2004                 }
2005
2006                 return $options;
2007         }
2008
2009         /**
2010          * Prepare text which is about to be saved.
2011          * Returns a stdclass with source, pst and output members
2012          *
2013          * @deprecated in 1.21: use prepareContentForEdit instead.
2014          */
2015         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2016                 ContentHandler::deprecated( __METHOD__, '1.21' );
2017                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2018                 return $this->prepareContentForEdit( $content, $revid, $user );
2019         }
2020
2021         /**
2022          * Prepare content which is about to be saved.
2023          * Returns a stdclass with source, pst and output members
2024          *
2025          * @param Content $content
2026          * @param int|null $revid
2027          * @param User|null $user
2028          * @param string|null $serialization_format
2029          *
2030          * @return bool|object
2031          *
2032          * @since 1.21
2033          */
2034         public function prepareContentForEdit( Content $content, $revid = null, User $user = null,
2035                 $serialization_format = null
2036         ) {
2037                 global $wgContLang, $wgUser;
2038                 $user = is_null( $user ) ? $wgUser : $user;
2039                 //XXX: check $user->getId() here???
2040
2041                 // Use a sane default for $serialization_format, see bug 57026
2042                 if ( $serialization_format === null ) {
2043                         $serialization_format = $content->getContentHandler()->getDefaultFormat();
2044                 }
2045
2046                 if ( $this->mPreparedEdit
2047                         && $this->mPreparedEdit->newContent
2048                         && $this->mPreparedEdit->newContent->equals( $content )
2049                         && $this->mPreparedEdit->revid == $revid
2050                         && $this->mPreparedEdit->format == $serialization_format
2051                         // XXX: also check $user here?
2052                 ) {
2053                         // Already prepared
2054                         return $this->mPreparedEdit;
2055                 }
2056
2057                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2058                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2059
2060                 $edit = (object)array();
2061                 $edit->revid = $revid;
2062
2063                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2064
2065                 $edit->format = $serialization_format;
2066                 $edit->popts = $this->makeParserOptions( 'canonical' );
2067                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2068
2069                 $edit->newContent = $content;
2070                 $edit->oldContent = $this->getContent( Revision::RAW );
2071
2072                 // NOTE: B/C for hooks! don't use these fields!
2073                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2074                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2075                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2076
2077                 $this->mPreparedEdit = $edit;
2078                 return $edit;
2079         }
2080
2081         /**
2082          * Do standard deferred updates after page edit.
2083          * Update links tables, site stats, search index and message cache.
2084          * Purges pages that include this page if the text was changed here.
2085          * Every 100th edit, prune the recent changes table.
2086          *
2087          * @param $revision Revision object
2088          * @param $user User object that did the revision
2089          * @param array $options of options, following indexes are used:
2090          * - changed: boolean, whether the revision changed the content (default true)
2091          * - created: boolean, whether the revision created the page (default false)
2092          * - oldcountable: boolean or null (default null):
2093          *   - boolean: whether the page was counted as an article before that
2094          *     revision, only used in changed is true and created is false
2095          *   - null: don't change the article count
2096          */
2097         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2098                 global $wgEnableParserCache;
2099
2100                 wfProfileIn( __METHOD__ );
2101
2102                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2103                 $content = $revision->getContent();
2104
2105                 // Parse the text
2106                 // Be careful not to do pre-save transform twice: $text is usually
2107                 // already pre-save transformed once.
2108                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2109                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2110                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2111                 } else {
2112                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2113                         $editInfo = $this->mPreparedEdit;
2114                 }
2115
2116                 // Save it to the parser cache
2117                 if ( $wgEnableParserCache ) {
2118                         $parserCache = ParserCache::singleton();
2119                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2120                 }
2121
2122                 // Update the links tables and other secondary data
2123                 if ( $content ) {
2124                         $recursive = $options['changed']; // bug 50785
2125                         $updates = $content->getSecondaryDataUpdates(
2126                                 $this->getTitle(), null, $recursive, $editInfo->output );
2127                         DataUpdate::runUpdates( $updates );
2128                 }
2129
2130                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2131
2132                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2133                         if ( 0 == mt_rand( 0, 99 ) ) {
2134                                 // Flush old entries from the `recentchanges` table; we do this on
2135                                 // random requests so as to avoid an increase in writes for no good reason
2136                                 RecentChange::purgeExpiredChanges();
2137                         }
2138                 }
2139
2140                 if ( !$this->exists() ) {
2141                         wfProfileOut( __METHOD__ );
2142                         return;
2143                 }
2144
2145                 $id = $this->getId();
2146                 $title = $this->mTitle->getPrefixedDBkey();
2147                 $shortTitle = $this->mTitle->getDBkey();
2148
2149                 if ( !$options['changed'] ) {
2150                         $good = 0;
2151                         $total = 0;
2152                 } elseif ( $options['created'] ) {
2153                         $good = (int)$this->isCountable( $editInfo );
2154                         $total = 1;
2155                 } elseif ( $options['oldcountable'] !== null ) {
2156                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2157                         $total = 0;
2158                 } else {
2159                         $good = 0;
2160                         $total = 0;
2161                 }
2162
2163                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2164                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2165
2166                 // If this is another user's talk page, update newtalk.
2167                 // Don't do this if $options['changed'] = false (null-edits) nor if
2168                 // it's a minor edit and the user doesn't want notifications for those.
2169                 if ( $options['changed']
2170                         && $this->mTitle->getNamespace() == NS_USER_TALK
2171                         && $shortTitle != $user->getTitleKey()
2172                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2173                 ) {
2174                         $recipient = User::newFromName( $shortTitle, false );
2175                         if ( !$recipient ) {
2176                                 wfDebug( __METHOD__ . ": invalid username\n" );
2177                         } else {
2178                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2179                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2180                                         if ( User::isIP( $shortTitle ) ) {
2181                                                 // An anonymous user
2182                                                 $recipient->setNewtalk( true, $revision );
2183                                         } elseif ( $recipient->isLoggedIn() ) {
2184                                                 $recipient->setNewtalk( true, $revision );
2185                                         } else {
2186                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2187                                         }
2188                                 }
2189                         }
2190                 }
2191
2192                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2193                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2194                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2195                         if ( $msgtext === false || $msgtext === null ) {
2196                                 $msgtext = '';
2197                         }
2198
2199                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2200                 }
2201
2202                 if ( $options['created'] ) {
2203                         self::onArticleCreate( $this->mTitle );
2204                 } else {
2205                         self::onArticleEdit( $this->mTitle );
2206                 }
2207
2208                 wfProfileOut( __METHOD__ );
2209         }
2210
2211         /**
2212          * Edit an article without doing all that other stuff
2213          * The article must already exist; link tables etc
2214          * are not updated, caches are not flushed.
2215          *
2216          * @param string $text text submitted
2217          * @param $user User The relevant user
2218          * @param string $comment comment submitted
2219          * @param $minor Boolean: whereas it's a minor modification
2220          *
2221          * @deprecated since 1.21, use doEditContent() instead.
2222          */
2223         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2224                 ContentHandler::deprecated( __METHOD__, "1.21" );
2225
2226                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2227                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2228         }
2229
2230         /**
2231          * Edit an article without doing all that other stuff
2232          * The article must already exist; link tables etc
2233          * are not updated, caches are not flushed.
2234          *
2235          * @param Content $content Content submitted
2236          * @param User $user The relevant user
2237          * @param string $comment comment submitted
2238          * @param string $serialisation_format Format for storing the content in the database
2239          * @param bool $minor Whereas it's a minor modification
2240          */
2241         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2242                 $serialisation_format = null
2243         ) {
2244                 wfProfileIn( __METHOD__ );
2245
2246                 $serialized = $content->serialize( $serialisation_format );
2247
2248                 $dbw = wfGetDB( DB_MASTER );
2249                 $revision = new Revision( array(
2250                         'title'      => $this->getTitle(), // for determining the default content model
2251                         'page'       => $this->getId(),
2252                         'text'       => $serialized,
2253                         'length'     => $content->getSize(),
2254                         'comment'    => $comment,
2255                         'minor_edit' => $minor ? 1 : 0,
2256                 ) ); // XXX: set the content object?
2257                 $revision->insertOn( $dbw );
2258                 $this->updateRevisionOn( $dbw, $revision );
2259
2260                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2261
2262                 wfProfileOut( __METHOD__ );
2263         }
2264
2265         /**
2266          * Update the article's restriction field, and leave a log entry.
2267          * This works for protection both existing and non-existing pages.
2268          *
2269          * @param array $limit set of restriction keys
2270          * @param array $expiry per restriction type expiration
2271          * @param int &$cascade Set to false if cascading protection isn't allowed.
2272          * @param string $reason
2273          * @param User $user The user updating the restrictions
2274          * @return Status
2275          */
2276         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2277                 global $wgCascadingRestrictionLevels, $wgContLang;
2278
2279                 if ( wfReadOnly() ) {
2280                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2281                 }
2282
2283                 $this->loadPageData( 'fromdbmaster' );
2284                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2285                 $id = $this->getId();
2286
2287                 if ( !$cascade ) {
2288                         $cascade = false;
2289                 }
2290
2291                 // Take this opportunity to purge out expired restrictions
2292                 Title::purgeExpiredRestrictions();
2293
2294                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2295                 // we expect a single selection, but the schema allows otherwise.
2296                 $isProtected = false;
2297                 $protect = false;
2298                 $changed = false;
2299
2300                 $dbw = wfGetDB( DB_MASTER );
2301
2302                 foreach ( $restrictionTypes as $action ) {
2303                         if ( !isset( $expiry[$action] ) ) {
2304                                 $expiry[$action] = $dbw->getInfinity();
2305                         }
2306                         if ( !isset( $limit[$action] ) ) {
2307                                 $limit[$action] = '';
2308                         } elseif ( $limit[$action] != '' ) {
2309                                 $protect = true;
2310                         }
2311
2312                         // Get current restrictions on $action
2313                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2314                         if ( $current != '' ) {
2315                                 $isProtected = true;
2316                         }
2317
2318                         if ( $limit[$action] != $current ) {
2319                                 $changed = true;
2320                         } elseif ( $limit[$action] != '' ) {
2321                                 // Only check expiry change if the action is actually being
2322                                 // protected, since expiry does nothing on an not-protected
2323                                 // action.
2324                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2325                                         $changed = true;
2326                                 }
2327                         }
2328                 }
2329
2330                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2331                         $changed = true;
2332                 }
2333
2334                 // If nothing has changed, do nothing
2335                 if ( !$changed ) {
2336                         return Status::newGood();
2337                 }
2338
2339                 if ( !$protect ) { // No protection at all means unprotection
2340                         $revCommentMsg = 'unprotectedarticle';
2341                         $logAction = 'unprotect';
2342                 } elseif ( $isProtected ) {
2343                         $revCommentMsg = 'modifiedarticleprotection';
2344                         $logAction = 'modify';
2345                 } else {
2346                         $revCommentMsg = 'protectedarticle';
2347                         $logAction = 'protect';
2348                 }
2349
2350                 // Truncate for whole multibyte characters
2351                 $reason = $wgContLang->truncate( $reason, 255 );
2352
2353                 if ( $id ) { // Protection of existing page
2354                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2355                                 return Status::newGood();
2356                         }
2357
2358                         // Only certain restrictions can cascade...
2359                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2360                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2361                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2362                         }
2363                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2364                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2365                         }
2366
2367                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2368                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2369                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2370                         }
2371                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2372                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2373                         }
2374
2375                         // The schema allows multiple restrictions
2376                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2377                                 $cascade = false;
2378                         }
2379
2380                         // insert null revision to identify the page protection change as edit summary
2381                         $latest = $this->getLatest();
2382                         $nullRevision = $this->insertProtectNullRevision( $revCommentMsg, $limit, $expiry, $cascade, $reason );
2383                         if ( $nullRevision === null ) {
2384                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2385                         }
2386
2387                         // Update restrictions table
2388                         foreach ( $limit as $action => $restrictions ) {
2389                                 if ( $restrictions != '' ) {
2390                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2391                                                 array( 'pr_page' => $id,
2392                                                         'pr_type' => $action,
2393                                                         'pr_level' => $restrictions,
2394                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2395                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2396                                                 ),
2397                                                 __METHOD__
2398                                         );
2399                                 } else {
2400                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2401                                                 'pr_type' => $action ), __METHOD__ );
2402                                 }
2403                         }
2404
2405                         // Clear out legacy restriction fields
2406                         $dbw->update(
2407                                 'page',
2408                                 array( 'page_restrictions' => '' ),
2409                                 array( 'page_id' => $id ),
2410                                 __METHOD__
2411                         );
2412
2413                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2414                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2415                 } else { // Protection of non-existing page (also known as "title protection")
2416                         // Cascade protection is meaningless in this case
2417                         $cascade = false;
2418
2419                         if ( $limit['create'] != '' ) {
2420                                 $dbw->replace( 'protected_titles',
2421                                         array( array( 'pt_namespace', 'pt_title' ) ),
2422                                         array(
2423                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2424                                                 'pt_title' => $this->mTitle->getDBkey(),
2425                                                 'pt_create_perm' => $limit['create'],
2426                                                 'pt_timestamp' => $dbw->timestamp(),
2427                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2428                                                 'pt_user' => $user->getId(),
2429                                                 'pt_reason' => $reason,
2430                                         ), __METHOD__
2431                                 );
2432                         } else {
2433                                 $dbw->delete( 'protected_titles',
2434                                         array(
2435                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2436                                                 'pt_title' => $this->mTitle->getDBkey()
2437                                         ), __METHOD__
2438                                 );
2439                         }
2440                 }
2441
2442                 $this->mTitle->flushRestrictions();
2443                 InfoAction::invalidateCache( $this->mTitle );
2444
2445                 if ( $logAction == 'unprotect' ) {
2446                         $params = array();
2447                 } else {
2448                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2449                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2450                 }
2451
2452                 // Update the protection log
2453                 $log = new LogPage( 'protect' );
2454                 $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2455
2456                 return Status::newGood();
2457         }
2458
2459         /**
2460          * Insert a new null revision for this page.
2461          *
2462          * @param string $revCommentMsg comment message key for the revision
2463          * @param array $limit set of restriction keys
2464          * @param array $expiry per restriction type expiration
2465          * @param int $cascade Set to false if cascading protection isn't allowed.
2466          * @param string $reason
2467          * @return Revision|null on error
2468          */
2469         public function insertProtectNullRevision( $revCommentMsg, array $limit, array $expiry, $cascade, $reason ) {
2470                 global $wgContLang;
2471                 $dbw = wfGetDB( DB_MASTER );
2472
2473                 // Prepare a null revision to be added to the history
2474                 $editComment = $wgContLang->ucfirst(
2475                         wfMessage(
2476                                 $revCommentMsg,
2477                                 $this->mTitle->getPrefixedText()
2478                         )->inContentLanguage()->text()
2479                 );
2480                 if ( $reason ) {
2481                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2482                 }
2483                 $protectDescription = $this->protectDescription( $limit, $expiry );
2484                 if ( $protectDescription ) {
2485                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2486                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2487                 }
2488                 if ( $cascade ) {
2489                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2490                         $editComment .= wfMessage( 'brackets' )->params(
2491                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2492                         )->inContentLanguage()->text();
2493                 }
2494
2495                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true );
2496                 if ( $nullRev ) {
2497                         $nullRev->insertOn( $dbw );
2498
2499                         // Update page record and touch page
2500                         $oldLatest = $nullRev->getParentId();
2501                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2502                 }
2503
2504                 return $nullRev;
2505         }
2506
2507         /**
2508          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2509          * @return string
2510          */
2511         protected function formatExpiry( $expiry ) {
2512                 global $wgContLang;
2513                 $dbr = wfGetDB( DB_SLAVE );
2514
2515                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2516                 if ( $encodedExpiry != 'infinity' ) {
2517                         return wfMessage(
2518                                 'protect-expiring',
2519                                 $wgContLang->timeanddate( $expiry, false, false ),
2520                                 $wgContLang->date( $expiry, false, false ),
2521                                 $wgContLang->time( $expiry, false, false )
2522                         )->inContentLanguage()->text();
2523                 } else {
2524                         return wfMessage( 'protect-expiry-indefinite' )
2525                                 ->inContentLanguage()->text();
2526                 }
2527         }
2528
2529         /**
2530          * Builds the description to serve as comment for the edit.
2531          *
2532          * @param array $limit set of restriction keys
2533          * @param array $expiry per restriction type expiration
2534          * @return string
2535          */
2536         public function protectDescription( array $limit, array $expiry ) {
2537                 $protectDescription = '';
2538
2539                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2540                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2541                         # All possible message keys are listed here for easier grepping:
2542                         # * restriction-create
2543                         # * restriction-edit
2544                         # * restriction-move
2545                         # * restriction-upload
2546                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2547                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2548                         # with '' filtered out. All possible message keys are listed below:
2549                         # * protect-level-autoconfirmed
2550                         # * protect-level-sysop
2551                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2552
2553                         $expiryText = $this->formatExpiry( $expiry[$action] );
2554
2555                         if ( $protectDescription !== '' ) {
2556                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2557                         }
2558                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2559                                 ->params( $actionText, $restrictionsText, $expiryText )
2560                                 ->inContentLanguage()->text();
2561                 }
2562
2563                 return $protectDescription;
2564         }
2565
2566         /**
2567          * Builds the description to serve as comment for the log entry.
2568          *
2569          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2570          * protect description text. Keep them in old format to avoid breaking compatibility.
2571          * TODO: Fix protection log to store structured description and format it on-the-fly.
2572          *
2573          * @param array $limit set of restriction keys
2574          * @param array $expiry per restriction type expiration
2575          * @return string
2576          */
2577         public function protectDescriptionLog( array $limit, array $expiry ) {
2578                 global $wgContLang;
2579
2580                 $protectDescriptionLog = '';
2581
2582                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2583                         $expiryText = $this->formatExpiry( $expiry[$action] );
2584                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2585                 }
2586
2587                 return trim( $protectDescriptionLog );
2588         }
2589
2590         /**
2591          * Take an array of page restrictions and flatten it to a string
2592          * suitable for insertion into the page_restrictions field.
2593          * @param $limit Array
2594          * @throws MWException
2595          * @return String
2596          */
2597         protected static function flattenRestrictions( $limit ) {
2598                 if ( !is_array( $limit ) ) {
2599                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2600                 }
2601
2602                 $bits = array();
2603                 ksort( $limit );
2604
2605                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2606                         $bits[] = "$action=$restrictions";
2607                 }
2608
2609                 return implode( ':', $bits );
2610         }
2611
2612         /**
2613          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2614          * backwards compatibility, if you care about error reporting you should use
2615          * doDeleteArticleReal() instead.
2616          *
2617          * Deletes the article with database consistency, writes logs, purges caches
2618          *
2619          * @param string $reason delete reason for deletion log
2620          * @param $suppress boolean suppress all revisions and log the deletion in
2621          *        the suppression log instead of the deletion log
2622          * @param int $id article ID
2623          * @param $commit boolean defaults to true, triggers transaction end
2624          * @param &$error Array of errors to append to
2625          * @param $user User The deleting user
2626          * @return boolean true if successful
2627          */
2628         public function doDeleteArticle(
2629                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2630         ) {
2631                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2632                 return $status->isGood();
2633         }
2634
2635         /**
2636          * Back-end article deletion
2637          * Deletes the article with database consistency, writes logs, purges caches
2638          *
2639          * @since 1.19
2640          *
2641          * @param string $reason delete reason for deletion log
2642          * @param $suppress boolean suppress all revisions and log the deletion in
2643          *        the suppression log instead of the deletion log
2644          * @param int $id article ID
2645          * @param $commit boolean defaults to true, triggers transaction end
2646          * @param &$error Array of errors to append to
2647          * @param $user User The deleting user
2648          * @return Status: Status object; if successful, $status->value is the log_id of the
2649          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2650          *                 found, $status is a non-fatal 'cannotdelete' error
2651          */
2652         public function doDeleteArticleReal(
2653                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2654         ) {
2655                 global $wgUser, $wgContentHandlerUseDB;
2656
2657                 wfDebug( __METHOD__ . "\n" );
2658
2659                 $status = Status::newGood();
2660
2661                 if ( $this->mTitle->getDBkey() === '' ) {
2662                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2663                         return $status;
2664                 }
2665
2666                 $user = is_null( $user ) ? $wgUser : $user;
2667                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2668                         if ( $status->isOK() ) {
2669                                 // Hook aborted but didn't set a fatal status
2670                                 $status->fatal( 'delete-hook-aborted' );
2671                         }
2672                         return $status;
2673                 }
2674
2675                 if ( $id == 0 ) {
2676                         $this->loadPageData( 'forupdate' );
2677                         $id = $this->getID();
2678                         if ( $id == 0 ) {
2679                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2680                                 return $status;
2681                         }
2682                 }
2683
2684                 // Bitfields to further suppress the content
2685                 if ( $suppress ) {
2686                         $bitfield = 0;
2687                         // This should be 15...
2688                         $bitfield |= Revision::DELETED_TEXT;
2689                         $bitfield |= Revision::DELETED_COMMENT;
2690                         $bitfield |= Revision::DELETED_USER;
2691                         $bitfield |= Revision::DELETED_RESTRICTED;
2692                 } else {
2693                         $bitfield = 'rev_deleted';
2694                 }
2695
2696                 // we need to remember the old content so we can use it to generate all deletion updates.
2697                 $content = $this->getContent( Revision::RAW );
2698
2699                 $dbw = wfGetDB( DB_MASTER );
2700                 $dbw->begin( __METHOD__ );
2701                 // For now, shunt the revision data into the archive table.
2702                 // Text is *not* removed from the text table; bulk storage
2703                 // is left intact to avoid breaking block-compression or
2704                 // immutable storage schemes.
2705                 //
2706                 // For backwards compatibility, note that some older archive
2707                 // table entries will have ar_text and ar_flags fields still.
2708                 //
2709                 // In the future, we may keep revisions and mark them with
2710                 // the rev_deleted field, which is reserved for this purpose.
2711
2712                 $row = array(
2713                         'ar_namespace'  => 'page_namespace',
2714                         'ar_title'      => 'page_title',
2715                         'ar_comment'    => 'rev_comment',
2716                         'ar_user'       => 'rev_user',
2717                         'ar_user_text'  => 'rev_user_text',
2718                         'ar_timestamp'  => 'rev_timestamp',
2719                         'ar_minor_edit' => 'rev_minor_edit',
2720                         'ar_rev_id'     => 'rev_id',
2721                         'ar_parent_id'  => 'rev_parent_id',
2722                         'ar_text_id'    => 'rev_text_id',
2723                         'ar_text'       => '\'\'', // Be explicit to appease
2724                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2725                         'ar_len'        => 'rev_len',
2726                         'ar_page_id'    => 'page_id',
2727                         'ar_deleted'    => $bitfield,
2728                         'ar_sha1'       => 'rev_sha1',
2729                 );
2730
2731                 if ( $wgContentHandlerUseDB ) {
2732                         $row['ar_content_model'] = 'rev_content_model';
2733                         $row['ar_content_format'] = 'rev_content_format';
2734                 }
2735
2736                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2737                         $row,
2738                         array(
2739                                 'page_id' => $id,
2740                                 'page_id = rev_page'
2741                         ), __METHOD__
2742                 );
2743
2744                 // Now that it's safely backed up, delete it
2745                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2746                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2747
2748                 if ( !$ok ) {
2749                         $dbw->rollback( __METHOD__ );
2750                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2751                         return $status;
2752                 }
2753
2754                 if ( !$dbw->cascadingDeletes() ) {
2755                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2756                 }
2757
2758                 $this->doDeleteUpdates( $id, $content );
2759
2760                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2761                 $logtype = $suppress ? 'suppress' : 'delete';
2762
2763                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2764                 $logEntry->setPerformer( $user );
2765                 $logEntry->setTarget( $this->mTitle );
2766                 $logEntry->setComment( $reason );
2767                 $logid = $logEntry->insert();
2768                 $logEntry->publish( $logid );
2769
2770                 if ( $commit ) {
2771                         $dbw->commit( __METHOD__ );
2772                 }
2773
2774                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2775                 $status->value = $logid;
2776                 return $status;
2777         }
2778
2779         /**
2780          * Do some database updates after deletion
2781          *
2782          * @param int $id page_id value of the page being deleted
2783          * @param $content Content: optional page content to be used when determining the required updates.
2784          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2785          */
2786         public function doDeleteUpdates( $id, Content $content = null ) {
2787                 // update site status
2788                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2789
2790                 // remove secondary indexes, etc
2791                 $updates = $this->getDeletionUpdates( $content );
2792                 DataUpdate::runUpdates( $updates );
2793
2794                 // Reparse any pages transcluding this page
2795                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2796
2797                 // Reparse any pages including this image
2798                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2799                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2800                 }
2801
2802                 // Clear caches
2803                 WikiPage::onArticleDelete( $this->mTitle );
2804
2805                 // Reset this object and the Title object
2806                 $this->loadFromRow( false, self::READ_LATEST );
2807
2808                 // Search engine
2809                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2810         }
2811
2812         /**
2813          * Roll back the most recent consecutive set of edits to a page
2814          * from the same user; fails if there are no eligible edits to
2815          * roll back to, e.g. user is the sole contributor. This function
2816          * performs permissions checks on $user, then calls commitRollback()
2817          * to do the dirty work
2818          *
2819          * @todo Separate the business/permission stuff out from backend code
2820          *
2821          * @param string $fromP Name of the user whose edits to rollback.
2822          * @param string $summary Custom summary. Set to default summary if empty.
2823          * @param string $token Rollback token.
2824          * @param $bot Boolean: If true, mark all reverted edits as bot.
2825          *
2826          * @param array $resultDetails contains result-specific array of additional values
2827          *    'alreadyrolled' : 'current' (rev)
2828          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2829          *
2830          * @param $user User The user performing the rollback
2831          * @return array of errors, each error formatted as
2832          *   array(messagekey, param1, param2, ...).
2833          * On success, the array is empty.  This array can also be passed to
2834          * OutputPage::showPermissionsErrorPage().
2835          */
2836         public function doRollback(
2837                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2838         ) {
2839                 $resultDetails = null;
2840
2841                 // Check permissions
2842                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2843                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2844                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2845
2846                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2847                         $errors[] = array( 'sessionfailure' );
2848                 }
2849
2850                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2851                         $errors[] = array( 'actionthrottledtext' );
2852                 }
2853
2854                 // If there were errors, bail out now
2855                 if ( !empty( $errors ) ) {
2856                         return $errors;
2857                 }
2858
2859                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2860         }
2861
2862         /**
2863          * Backend implementation of doRollback(), please refer there for parameter
2864          * and return value documentation
2865          *
2866          * NOTE: This function does NOT check ANY permissions, it just commits the
2867          * rollback to the DB. Therefore, you should only call this function direct-
2868          * ly if you want to use custom permissions checks. If you don't, use
2869          * doRollback() instead.
2870          * @param string $fromP Name of the user whose edits to rollback.
2871          * @param string $summary Custom summary. Set to default summary if empty.
2872          * @param $bot Boolean: If true, mark all reverted edits as bot.
2873          *
2874          * @param array $resultDetails contains result-specific array of additional values
2875          * @param $guser User The user performing the rollback
2876          * @return array
2877          */
2878         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2879                 global $wgUseRCPatrol, $wgContLang;
2880
2881                 $dbw = wfGetDB( DB_MASTER );
2882
2883                 if ( wfReadOnly() ) {
2884                         return array( array( 'readonlytext' ) );
2885                 }
2886
2887                 // Get the last editor
2888                 $current = $this->getRevision();
2889                 if ( is_null( $current ) ) {
2890                         // Something wrong... no page?
2891                         return array( array( 'notanarticle' ) );
2892                 }
2893
2894                 $from = str_replace( '_', ' ', $fromP );
2895                 // User name given should match up with the top revision.
2896                 // If the user was deleted then $from should be empty.
2897                 if ( $from != $current->getUserText() ) {
2898                         $resultDetails = array( 'current' => $current );
2899                         return array( array( 'alreadyrolled',
2900                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2901                                 htmlspecialchars( $fromP ),
2902                                 htmlspecialchars( $current->getUserText() )
2903                         ) );
2904                 }
2905
2906                 // Get the last edit not by this guy...
2907                 // Note: these may not be public values
2908                 $user = intval( $current->getRawUser() );
2909                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2910                 $s = $dbw->selectRow( 'revision',
2911                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2912                         array( 'rev_page' => $current->getPage(),
2913                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2914                         ), __METHOD__,
2915                         array( 'USE INDEX' => 'page_timestamp',
2916                                 'ORDER BY' => 'rev_timestamp DESC' )
2917                         );
2918                 if ( $s === false ) {
2919                         // No one else ever edited this page
2920                         return array( array( 'cantrollback' ) );
2921                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2922                         // Only admins can see this text
2923                         return array( array( 'notvisiblerev' ) );
2924                 }
2925
2926                 // Generate the edit summary if necessary
2927                 $target = Revision::newFromId( $s->rev_id );
2928                 if ( empty( $summary ) ) {
2929                         if ( $from == '' ) { // no public user name
2930                                 $summary = wfMessage( 'revertpage-nouser' );
2931                         } else {
2932                                 $summary = wfMessage( 'revertpage' );
2933                         }
2934                 }
2935
2936                 // Allow the custom summary to use the same args as the default message
2937                 $args = array(
2938                         $target->getUserText(), $from, $s->rev_id,
2939                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2940                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2941                 );
2942                 if ( $summary instanceof Message ) {
2943                         $summary = $summary->params( $args )->inContentLanguage()->text();
2944                 } else {
2945                         $summary = wfMsgReplaceArgs( $summary, $args );
2946                 }
2947
2948                 // Trim spaces on user supplied text
2949                 $summary = trim( $summary );
2950
2951                 // Truncate for whole multibyte characters.
2952                 $summary = $wgContLang->truncate( $summary, 255 );
2953
2954                 // Save
2955                 $flags = EDIT_UPDATE;
2956
2957                 if ( $guser->isAllowed( 'minoredit' ) ) {
2958                         $flags |= EDIT_MINOR;
2959                 }
2960
2961                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2962                         $flags |= EDIT_FORCE_BOT;
2963                 }
2964
2965                 // Actually store the edit
2966                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2967
2968                 if ( !$status->isOK() ) {
2969                         return $status->getErrorsArray();
2970                 }
2971
2972                 $set = array();
2973                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2974                         // Mark all reverted edits as bot
2975                         $set['rc_bot'] = 1;
2976                 }
2977
2978                 if ( $wgUseRCPatrol ) {
2979                         // Mark all reverted edits as patrolled
2980                         $set['rc_patrolled'] = 1;
2981                 }
2982
2983                 if ( count( $set ) ) {
2984                         $dbw->update( 'recentchanges', $set,
2985                                 array( /* WHERE */
2986                                         'rc_cur_id' => $current->getPage(),
2987                                         'rc_user_text' => $current->getUserText(),
2988                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2989                                 ), __METHOD__
2990                         );
2991                 }
2992
2993                 if ( !empty( $status->value['revision'] ) ) {
2994                         $revId = $status->value['revision']->getId();
2995                 } else {
2996                         $revId = false;
2997                 }
2998
2999                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3000
3001                 $resultDetails = array(
3002                         'summary' => $summary,
3003                         'current' => $current,
3004                         'target' => $target,
3005                         'newid' => $revId
3006                 );
3007
3008                 return array();
3009         }
3010
3011         /**
3012          * The onArticle*() functions are supposed to be a kind of hooks
3013          * which should be called whenever any of the specified actions
3014          * are done.
3015          *
3016          * This is a good place to put code to clear caches, for instance.
3017          *
3018          * This is called on page move and undelete, as well as edit
3019          *
3020          * @param $title Title object
3021          */
3022         public static function onArticleCreate( $title ) {
3023                 // Update existence markers on article/talk tabs...
3024                 if ( $title->isTalkPage() ) {
3025                         $other = $title->getSubjectPage();
3026                 } else {
3027                         $other = $title->getTalkPage();
3028                 }
3029
3030                 $other->invalidateCache();
3031                 $other->purgeSquid();
3032
3033                 $title->touchLinks();
3034                 $title->purgeSquid();
3035                 $title->deleteTitleProtection();
3036         }
3037
3038         /**
3039          * Clears caches when article is deleted
3040          *
3041          * @param $title Title
3042          */
3043         public static function onArticleDelete( $title ) {
3044                 // Update existence markers on article/talk tabs...
3045                 if ( $title->isTalkPage() ) {
3046                         $other = $title->getSubjectPage();
3047                 } else {
3048                         $other = $title->getTalkPage();
3049                 }
3050
3051                 $other->invalidateCache();
3052                 $other->purgeSquid();
3053
3054                 $title->touchLinks();
3055                 $title->purgeSquid();
3056
3057                 // File cache
3058                 HTMLFileCache::clearFileCache( $title );
3059                 InfoAction::invalidateCache( $title );
3060
3061                 // Messages
3062                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3063                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3064                 }
3065
3066                 // Images
3067                 if ( $title->getNamespace() == NS_FILE ) {
3068                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3069                         $update->doUpdate();
3070                 }
3071
3072                 // User talk pages
3073                 if ( $title->getNamespace() == NS_USER_TALK ) {
3074                         $user = User::newFromName( $title->getText(), false );
3075                         if ( $user ) {
3076                                 $user->setNewtalk( false );
3077                         }
3078                 }
3079
3080                 // Image redirects
3081                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3082         }
3083
3084         /**
3085          * Purge caches on page update etc
3086          *
3087          * @param $title Title object
3088          * @todo Verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3089          */
3090         public static function onArticleEdit( $title ) {
3091                 // Invalidate caches of articles which include this page
3092                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3093
3094                 // Invalidate the caches of all pages which redirect here
3095                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3096
3097                 // Purge squid for this page only
3098                 $title->purgeSquid();
3099
3100                 // Clear file cache for this page only
3101                 HTMLFileCache::clearFileCache( $title );
3102                 InfoAction::invalidateCache( $title );
3103         }
3104
3105         /**#@-*/
3106
3107         /**
3108          * Returns a list of categories this page is a member of.
3109          * Results will include hidden categories
3110          *
3111          * @return TitleArray
3112          */
3113         public function getCategories() {
3114                 $id = $this->getId();
3115                 if ( $id == 0 ) {
3116                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3117                 }
3118
3119                 $dbr = wfGetDB( DB_SLAVE );
3120                 $res = $dbr->select( 'categorylinks',
3121                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3122                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3123                         // as not being aliases, and NS_CATEGORY is numeric
3124                         array( 'cl_from' => $id ),
3125                         __METHOD__ );
3126
3127                 return TitleArray::newFromResult( $res );
3128         }
3129
3130         /**
3131          * Returns a list of hidden categories this page is a member of.
3132          * Uses the page_props and categorylinks tables.
3133          *
3134          * @return Array of Title objects
3135          */
3136         public function getHiddenCategories() {
3137                 $result = array();
3138                 $id = $this->getId();
3139
3140                 if ( $id == 0 ) {
3141                         return array();
3142                 }
3143
3144                 $dbr = wfGetDB( DB_SLAVE );
3145                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3146                         array( 'cl_to' ),
3147                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3148                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3149                         __METHOD__ );
3150
3151                 if ( $res !== false ) {
3152                         foreach ( $res as $row ) {
3153                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3154                         }
3155                 }
3156
3157                 return $result;
3158         }
3159
3160         /**
3161          * Return an applicable autosummary if one exists for the given edit.
3162          * @param string|null $oldtext the previous text of the page.
3163          * @param string|null $newtext The submitted text of the page.
3164          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
3165          * @return string An appropriate autosummary, or an empty string.
3166          *
3167          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3168          */
3169         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3170                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
3171
3172                 ContentHandler::deprecated( __METHOD__, '1.21' );
3173
3174                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3175                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3176                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3177
3178                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3179         }
3180
3181         /**
3182          * Auto-generates a deletion reason
3183          *
3184          * @param &$hasHistory Boolean: whether the page has a history
3185          * @return mixed String containing deletion reason or empty string, or boolean false
3186          *    if no revision occurred
3187          */
3188         public function getAutoDeleteReason( &$hasHistory ) {
3189                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3190         }
3191
3192         /**
3193          * Update all the appropriate counts in the category table, given that
3194          * we've added the categories $added and deleted the categories $deleted.
3195          *
3196          * @param array $added   The names of categories that were added
3197          * @param array $deleted The names of categories that were deleted
3198          */
3199         public function updateCategoryCounts( array $added, array $deleted ) {
3200                 $that = $this;
3201                 $method = __METHOD__;
3202                 $dbw = wfGetDB( DB_MASTER );
3203
3204                 // Do this at the end of the commit to reduce lock wait timeouts
3205                 $dbw->onTransactionPreCommitOrIdle(
3206                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3207                                 $ns = $that->getTitle()->getNamespace();
3208
3209                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3210                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3211                                 if ( $ns == NS_CATEGORY ) {
3212                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3213                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3214                                 } elseif ( $ns == NS_FILE ) {
3215                                         $addFields[] = 'cat_files = cat_files + 1';
3216                                         $removeFields[] = 'cat_files = cat_files - 1';
3217                                 }
3218
3219                                 if ( count( $added ) ) {
3220                                         $insertRows = array();
3221                                         foreach ( $added as $cat ) {
3222                                                 $insertRows[] = array(
3223                                                         'cat_title'   => $cat,
3224                                                         'cat_pages'   => 1,
3225                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3226                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3227                                                 );
3228                                         }
3229                                         $dbw->upsert(
3230                                                 'category',
3231                                                 $insertRows,
3232                                                 array( 'cat_title' ),
3233                                                 $addFields,
3234                                                 $method
3235                                         );
3236                                 }
3237
3238                                 if ( count( $deleted ) ) {
3239                                         $dbw->update(
3240                                                 'category',
3241                                                 $removeFields,
3242                                                 array( 'cat_title' => $deleted ),
3243                                                 $method
3244                                         );
3245                                 }
3246
3247                                 foreach ( $added as $catName ) {
3248                                         $cat = Category::newFromName( $catName );
3249                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3250                                 }
3251
3252                                 foreach ( $deleted as $catName ) {
3253                                         $cat = Category::newFromName( $catName );
3254                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3255                                 }
3256                         }
3257                 );
3258         }
3259
3260         /**
3261          * Updates cascading protections
3262          *
3263          * @param $parserOutput ParserOutput object for the current version
3264          */
3265         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3266                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3267                         return;
3268                 }
3269
3270                 // templatelinks or imagelinks tables may have become out of sync,
3271                 // especially if using variable-based transclusions.
3272                 // For paranoia, check if things have changed and if
3273                 // so apply updates to the database. This will ensure
3274                 // that cascaded protections apply as soon as the changes
3275                 // are visible.
3276
3277                 // Get templates from templatelinks and images from imagelinks
3278                 $id = $this->getId();
3279
3280                 $dbLinks = array();
3281
3282                 $dbr = wfGetDB( DB_SLAVE );
3283                 $res = $dbr->select( array( 'templatelinks' ),
3284                         array( 'tl_namespace', 'tl_title' ),
3285                         array( 'tl_from' => $id ),
3286                         __METHOD__
3287                 );
3288
3289                 foreach ( $res as $row ) {
3290                         $dbLinks["{$row->tl_namespace}:{$row->tl_title}"] = true;
3291                 }
3292
3293                 $dbr = wfGetDB( DB_SLAVE );
3294                 $res = $dbr->select( array( 'imagelinks' ),
3295                         array( 'il_to' ),
3296                         array( 'il_from' => $id ),
3297                         __METHOD__
3298                 );
3299
3300                 foreach ( $res as $row ) {
3301                         $dbLinks[NS_FILE . ":{$row->il_to}"] = true;
3302                 }
3303
3304                 // Get templates and images from parser output.
3305                 $poLinks = array();
3306                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3307                         foreach ( $templates as $dbk => $id ) {
3308                                 $poLinks["$ns:$dbk"] = true;
3309                         }
3310                 }
3311                 foreach ( $parserOutput->getImages() as $dbk => $id ) {
3312                         $poLinks[NS_FILE . ":$dbk"] = true;
3313                 }
3314
3315                 // Get the diff
3316                 $links_diff = array_diff_key( $poLinks, $dbLinks );
3317
3318                 if ( count( $links_diff ) > 0 ) {
3319                         // Whee, link updates time.
3320                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3321                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3322                         $u->doUpdate();
3323                 }
3324         }
3325
3326         /**
3327          * Return a list of templates used by this article.
3328          * Uses the templatelinks table
3329          *
3330          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3331          * @return Array of Title objects
3332          */
3333         public function getUsedTemplates() {
3334                 return $this->mTitle->getTemplateLinksFrom();
3335         }
3336
3337         /**
3338          * This function is called right before saving the wikitext,
3339          * so we can do things like signatures and links-in-context.
3340          *
3341          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3342          * @param string $text article contents
3343          * @param $user User object: user doing the edit
3344          * @param $popts ParserOptions object: parser options, default options for
3345          *               the user loaded if null given
3346          * @return string article contents with altered wikitext markup (signatures
3347          *      converted, {{subst:}}, templates, etc.)
3348          */
3349         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3350                 global $wgParser, $wgUser;
3351
3352                 wfDeprecated( __METHOD__, '1.19' );
3353
3354                 $user = is_null( $user ) ? $wgUser : $user;
3355
3356                 if ( $popts === null ) {
3357                         $popts = ParserOptions::newFromUser( $user );
3358                 }
3359
3360                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3361         }
3362
3363         /**
3364          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3365          *
3366          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3367          * @return bool
3368          */
3369         public function isBigDeletion() {
3370                 wfDeprecated( __METHOD__, '1.19' );
3371                 return $this->mTitle->isBigDeletion();
3372         }
3373
3374         /**
3375          * Get the  approximate revision count of this page.
3376          *
3377          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3378          * @return int
3379          */
3380         public function estimateRevisionCount() {
3381                 wfDeprecated( __METHOD__, '1.19' );
3382                 return $this->mTitle->estimateRevisionCount();
3383         }
3384
3385         /**
3386          * Update the article's restriction field, and leave a log entry.
3387          *
3388          * @deprecated since 1.19
3389          * @param array $limit set of restriction keys
3390          * @param $reason String
3391          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3392          * @param array $expiry per restriction type expiration
3393          * @param $user User The user updating the restrictions
3394          * @return bool true on success
3395          */
3396         public function updateRestrictions(
3397                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3398         ) {
3399                 global $wgUser;
3400
3401                 $user = is_null( $user ) ? $wgUser : $user;
3402
3403                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3404         }
3405
3406         /**
3407          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3408          * about this page from secondary data stores such as links tables.
3409          *
3410          * @param Content|null $content optional Content object for determining the necessary updates
3411          * @return Array an array of DataUpdates objects
3412          */
3413         public function getDeletionUpdates( Content $content = null ) {
3414                 if ( !$content ) {
3415                         // load content object, which may be used to determine the necessary updates
3416                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3417                         $content = $this->getContent( Revision::RAW );
3418                 }
3419
3420                 if ( !$content ) {
3421                         $updates = array();
3422                 } else {
3423                         $updates = $content->getDeletionUpdates( $this );
3424                 }
3425
3426                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3427                 return $updates;
3428         }
3429
3430 }
3431
3432 class PoolWorkArticleView extends PoolCounterWork {
3433
3434         /**
3435          * @var Page
3436          */
3437         private $page;
3438
3439         /**
3440          * @var string
3441          */
3442         private $cacheKey;
3443
3444         /**
3445          * @var integer
3446          */
3447         private $revid;
3448
3449         /**
3450          * @var ParserOptions
3451          */
3452         private $parserOptions;
3453
3454         /**
3455          * @var Content|null
3456          */
3457         private $content = null;
3458
3459         /**
3460          * @var ParserOutput|bool
3461          */
3462         private $parserOutput = false;
3463
3464         /**
3465          * @var bool
3466          */
3467         private $isDirty = false;
3468
3469         /**
3470          * @var Status|bool
3471          */
3472         private $error = false;
3473
3474         /**
3475          * Constructor
3476          *
3477          * @param $page Page|WikiPage
3478          * @param $revid Integer: ID of the revision being parsed
3479          * @param $useParserCache Boolean: whether to use the parser cache
3480          * @param $parserOptions parserOptions to use for the parse operation
3481          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3482          */
3483         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3484                 if ( is_string( $content ) ) { // BC: old style call
3485                         $modelId = $page->getRevision()->getContentModel();
3486                         $format = $page->getRevision()->getContentFormat();
3487                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3488                 }
3489
3490                 $this->page = $page;
3491                 $this->revid = $revid;
3492                 $this->cacheable = $useParserCache;
3493                 $this->parserOptions = $parserOptions;
3494                 $this->content = $content;
3495                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3496                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3497         }
3498
3499         /**
3500          * Get the ParserOutput from this object, or false in case of failure
3501          *
3502          * @return ParserOutput
3503          */
3504         public function getParserOutput() {
3505                 return $this->parserOutput;
3506         }
3507
3508         /**
3509          * Get whether the ParserOutput is a dirty one (i.e. expired)
3510          *
3511          * @return bool
3512          */
3513         public function getIsDirty() {
3514                 return $this->isDirty;
3515         }
3516
3517         /**
3518          * Get a Status object in case of error or false otherwise
3519          *
3520          * @return Status|bool
3521          */
3522         public function getError() {
3523                 return $this->error;
3524         }
3525
3526         /**
3527          * @return bool
3528          */
3529         function doWork() {
3530                 global $wgUseFileCache;
3531
3532                 // @todo several of the methods called on $this->page are not declared in Page, but present
3533                 //        in WikiPage and delegated by Article.
3534
3535                 $isCurrent = $this->revid === $this->page->getLatest();
3536
3537                 if ( $this->content !== null ) {
3538                         $content = $this->content;
3539                 } elseif ( $isCurrent ) {
3540                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3541                         $content = $this->page->getContent( Revision::RAW );
3542                 } else {
3543                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3544
3545                         if ( $rev === null ) {
3546                                 $content = null;
3547                         } else {
3548                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3549                                 $content = $rev->getContent();
3550                         }
3551                 }
3552
3553                 if ( $content === null ) {
3554                         return false;
3555                 }
3556
3557                 // Reduce effects of race conditions for slow parses (bug 46014)
3558                 $cacheTime = wfTimestampNow();
3559
3560                 $time = - microtime( true );
3561                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3562                 $time += microtime( true );
3563
3564                 // Timing hack
3565                 if ( $time > 3 ) {
3566                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3567                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3568                 }
3569
3570                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3571                         ParserCache::singleton()->save(
3572                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime );
3573                 }
3574
3575                 // Make sure file cache is not used on uncacheable content.
3576                 // Output that has magic words in it can still use the parser cache
3577                 // (if enabled), though it will generally expire sooner.
3578                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3579                         $wgUseFileCache = false;
3580                 }
3581
3582                 if ( $isCurrent ) {
3583                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3584                 }
3585
3586                 return true;
3587         }
3588
3589         /**
3590          * @return bool
3591          */
3592         function getCachedWork() {
3593                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3594
3595                 if ( $this->parserOutput === false ) {
3596                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3597                         return false;
3598                 } else {
3599                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3600                         return true;
3601                 }
3602         }
3603
3604         /**
3605          * @return bool
3606          */
3607         function fallback() {
3608                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3609
3610                 if ( $this->parserOutput === false ) {
3611                         wfDebugLog( 'dirty', "dirty missing\n" );
3612                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3613                         return false;
3614                 } else {
3615                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3616                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3617                         $this->isDirty = true;
3618                         return true;
3619                 }
3620         }
3621
3622         /**
3623          * @param $status Status
3624          * @return bool
3625          */
3626         function error( $status ) {
3627                 $this->error = $status;
3628                 return false;
3629         }
3630 }