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 abstract class Page {}
  27
  28 /**
  29  * Class representing a MediaWiki article and history.
  30  *
  31  * Some fields are public only for backwards-compatibility. Use accessors.
  32  * In the past, this class was part of Article.php and everything was public.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class WikiPage extends Page implements IDBAccessObject {
  37         // Constants for $mDataLoadedFrom and related
  38
  39         /**
  40          * @var Title
  41          */
  42         public $mTitle = null;
  43
  44         /**@{{
  45          * @protected
  46          */
  47         public $mDataLoaded = false;         // !< Boolean
  48         public $mIsRedirect = false;         // !< Boolean
  49         public $mLatest = false;             // !< Integer (false means "not loaded")
  50         public $mPreparedEdit = false;       // !< Array
  51         /**@}}*/
  52
  53         /**
  54          * @var int; one of the READ_* constants
  55          */
  56         protected $mDataLoadedFrom = self::READ_NONE;
  57
  58         /**
  59          * @var Title
  60          */
  61         protected $mRedirectTarget = null;
  62
  63         /**
  64          * @var Revision
  65          */
  66         protected $mLastRevision = null;
  67
  68         /**
  69          * @var string; timestamp of the current revision or empty string if not loaded
  70          */
  71         protected $mTimestamp = '';
  72
  73         /**
  74          * @var string
  75          */
  76         protected $mTouched = '19700101000000';
  77
  78         /**
  79          * @var int|null
  80          */
  81         protected $mCounter = null;
  82
  83         /**
  84          * Constructor and clear the article
  85          * @param $title Title Reference to a Title object.
  86          */
  87         public function __construct( Title $title ) {
  88                 $this->mTitle = $title;
  89         }
  90
  91         /**
  92          * Create a WikiPage object of the appropriate class for the given title.
  93          *
  94          * @param $title Title
  95          * @throws MWException
  96          * @return WikiPage object of the appropriate type
  97          */
  98         public static function factory( Title $title ) {
  99                 $ns = $title->getNamespace();
 100
 101                 if ( $ns == NS_MEDIA ) {
 102                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 103                 } elseif ( $ns < 0 ) {
 104                         throw new MWException( "Invalid or virtual namespace $ns given." );
 105                 }
 106
 107                 switch ( $ns ) {
 108                         case NS_FILE:
 109                                 $page = new WikiFilePage( $title );
 110                                 break;
 111                         case NS_CATEGORY:
 112                                 $page = new WikiCategoryPage( $title );
 113                                 break;
 114                         default:
 115                                 $page = new WikiPage( $title );
 116                 }
 117
 118                 return $page;
 119         }
 120
 121         /**
 122          * Constructor from a page id
 123          *
 124          * @param $id Int article ID to load
 125          * @param $from string|int one of the following values:
 126          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 127          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 128          *
 129          * @return WikiPage|null
 130          */
 131         public static function newFromID( $id, $from = 'fromdb' ) {
 132                 $from = self::convertSelectType( $from );
 133                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 134                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 135                 if ( !$row ) {
 136                         return null;
 137                 }
 138                 return self::newFromRow( $row, $from );
 139         }
 140
 141         /**
 142          * Constructor from a database row
 143          *
 144          * @since 1.20
 145          * @param $row object: database row containing at least fields returned
 146          *        by selectFields().
 147          * @param $from string|int: source of $data:
 148          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 150          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 151          * @return WikiPage
 152          */
 153         public static function newFromRow( $row, $from = 'fromdb' ) {
 154                 $page = self::factory( Title::newFromRow( $row ) );
 155                 $page->loadFromRow( $row, $from );
 156                 return $page;
 157         }
 158
 159         /**
 160          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 161          *
 162          * @param $type object|string|int
 163          * @return mixed
 164          */
 165         private static function convertSelectType( $type ) {
 166                 switch ( $type ) {
 167                 case 'fromdb':
 168                         return self::READ_NORMAL;
 169                 case 'fromdbmaster':
 170                         return self::READ_LATEST;
 171                 case 'forupdate':
 172                         return self::READ_LOCKING;
 173                 default:
 174                         // It may already be an integer or whatever else
 175                         return $type;
 176                 }
 177         }
 178
 179         /**
 180          * Returns overrides for action handlers.
 181          * Classes listed here will be used instead of the default one when
 182          * (and only when) $wgActions[$action] === true. This allows subclasses
 183          * to override the default behavior.
 184          *
 185          * @todo: move this UI stuff somewhere else
 186          *
 187          * @return Array
 188          */
 189         public function getActionOverrides() {
 190                 $content_handler = $this->getContentHandler();
 191                 return $content_handler->getActionOverrides();
 192         }
 193
 194         /**
 195          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 196          *
 197          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 198          *
 199          * @return ContentHandler
 200          *
 201          * @since 1.21
 202          */
 203         public function getContentHandler() {
 204                 return ContentHandler::getForModelID( $this->getContentModel() );
 205         }
 206
 207         /**
 208          * Get the title object of the article
 209          * @return Title object of this page
 210          */
 211         public function getTitle() {
 212                 return $this->mTitle;
 213         }
 214
 215         /**
 216          * Clear the object
 217          * @return void
 218          */
 219         public function clear() {
 220                 $this->mDataLoaded = false;
 221                 $this->mDataLoadedFrom = self::READ_NONE;
 222
 223                 $this->clearCacheFields();
 224         }
 225
 226         /**
 227          * Clear the object cache fields
 228          * @return void
 229          */
 230         protected function clearCacheFields() {
 231                 $this->mCounter = null;
 232                 $this->mRedirectTarget = null; # Title object if set
 233                 $this->mLastRevision = null; # Latest revision
 234                 $this->mTouched = '19700101000000';
 235                 $this->mTimestamp = '';
 236                 $this->mIsRedirect = false;
 237                 $this->mLatest = false;
 238                 $this->mPreparedEdit = false;
 239         }
 240
 241         /**
 242          * Return the list of revision fields that should be selected to create
 243          * a new page.
 244          *
 245          * @return array
 246          */
 247         public static function selectFields() {
 248                 global $wgContentHandlerUseDB;
 249
 250                 $fields = array(
 251                         'page_id',
 252                         'page_namespace',
 253                         'page_title',
 254                         'page_restrictions',
 255                         'page_counter',
 256                         'page_is_redirect',
 257                         'page_is_new',
 258                         'page_random',
 259                         'page_touched',
 260                         'page_latest',
 261                         'page_len',
 262                 );
 263
 264                 if ( $wgContentHandlerUseDB ) {
 265                         $fields[] = 'page_content_model';
 266                 }
 267
 268                 return $fields;
 269         }
 270
 271         /**
 272          * Fetch a page record with the given conditions
 273          * @param $dbr DatabaseBase object
 274          * @param $conditions Array
 275          * @param $options Array
 276          * @return mixed Database result resource, or false on failure
 277          */
 278         protected function pageData( $dbr, $conditions, $options = array() ) {
 279                 $fields = self::selectFields();
 280
 281                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 282
 283                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 284
 285                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 286
 287                 return $row;
 288         }
 289
 290         /**
 291          * Fetch a page record matching the Title object's namespace and title
 292          * using a sanitized title string
 293          *
 294          * @param $dbr DatabaseBase object
 295          * @param $title Title object
 296          * @param $options Array
 297          * @return mixed Database result resource, or false on failure
 298          */
 299         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 300                 return $this->pageData( $dbr, array(
 301                         'page_namespace' => $title->getNamespace(),
 302                         'page_title'     => $title->getDBkey() ), $options );
 303         }
 304
 305         /**
 306          * Fetch a page record matching the requested ID
 307          *
 308          * @param $dbr DatabaseBase
 309          * @param $id Integer
 310          * @param $options Array
 311          * @return mixed Database result resource, or false on failure
 312          */
 313         public function pageDataFromId( $dbr, $id, $options = array() ) {
 314                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 315         }
 316
 317         /**
 318          * Set the general counter, title etc data loaded from
 319          * some source.
 320          *
 321          * @param $from object|string|int One of the following:
 322          *        - A DB query result object
 323          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 324          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 325          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 326          *
 327          * @return void
 328          */
 329         public function loadPageData( $from = 'fromdb' ) {
 330                 $from = self::convertSelectType( $from );
 331                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 332                         // We already have the data from the correct location, no need to load it twice.
 333                         return;
 334                 }
 335
 336                 if ( $from === self::READ_LOCKING ) {
 337                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 338                 } elseif ( $from === self::READ_LATEST ) {
 339                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 340                 } elseif ( $from === self::READ_NORMAL ) {
 341                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 342                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 343                         # Note that DB also stores the master position in the session and checks it.
 344                         $touched = $this->getCachedLastEditTime();
 345                         if ( $touched ) { // key set
 346                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 347                                         $from = self::READ_LATEST;
 348                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 349                                 }
 350                         }
 351                 } else {
 352                         // No idea from where the caller got this data, assume slave database.
 353                         $data = $from;
 354                         $from = self::READ_NORMAL;
 355                 }
 356
 357                 $this->loadFromRow( $data, $from );
 358         }
 359
 360         /**
 361          * Load the object from a database row
 362          *
 363          * @since 1.20
 364          * @param $data object: database row containing at least fields returned
 365          *        by selectFields()
 366          * @param $from string|int One of the following:
 367          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 368          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 369          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 370          *          the master DB using SELECT FOR UPDATE
 371          */
 372         public function loadFromRow( $data, $from ) {
 373                 $lc = LinkCache::singleton();
 374
 375                 if ( $data ) {
 376                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 377
 378                         $this->mTitle->loadFromRow( $data );
 379
 380                         # Old-fashioned restrictions
 381                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 382
 383                         $this->mCounter     = intval( $data->page_counter );
 384                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 385                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 386                         $this->mLatest      = intval( $data->page_latest );
 387                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 388                         // Double-check the ID of any cached latest Revision object for consistency.
 389                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 390                                 $this->mLastRevision = null;
 391                                 $this->mTimestamp = '';
 392                         }
 393                 } else {
 394                         $lc->addBadLinkObj( $this->mTitle );
 395
 396                         $this->mTitle->loadFromRow( false );
 397
 398                         $this->clearCacheFields();
 399                 }
 400
 401                 $this->mDataLoaded = true;
 402                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 403         }
 404
 405         /**
 406          * @return int Page ID
 407          */
 408         public function getId() {
 409                 return $this->mTitle->getArticleID();
 410         }
 411
 412         /**
 413          * @return bool Whether or not the page exists in the database
 414          */
 415         public function exists() {
 416                 return $this->mTitle->exists();
 417         }
 418
 419         /**
 420          * Check if this page is something we're going to be showing
 421          * some sort of sensible content for. If we return false, page
 422          * views (plain action=view) will return an HTTP 404 response,
 423          * so spiders and robots can know they're following a bad link.
 424          *
 425          * @return bool
 426          */
 427         public function hasViewableContent() {
 428                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 429         }
 430
 431         /**
 432          * @return int The view count for the page
 433          */
 434         public function getCount() {
 435                 if ( !$this->mDataLoaded ) {
 436                         $this->loadPageData();
 437                 }
 438
 439                 return $this->mCounter;
 440         }
 441
 442         /**
 443          * Tests if the article content represents a redirect
 444          *
 445          * @return bool
 446          */
 447         public function isRedirect( ) {
 448                 $content = $this->getContent();
 449                 if ( !$content ) return false;
 450
 451                 return $content->isRedirect();
 452         }
 453
 454         /**
 455          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 456          *
 457          * Will use the revisions actual content model if the page exists,
 458          * and the page's default if the page doesn't exist yet.
 459          *
 460          * @return String
 461          *
 462          * @since 1.21
 463          */
 464         public function getContentModel() {
 465                 if ( $this->exists() ) {
 466                         # look at the revision's actual content model
 467                         $rev = $this->getRevision();
 468
 469                         if ( $rev !== null ) {
 470                                 return $rev->getContentModel();
 471                         } else {
 472                                 $title = $this->mTitle->getPrefixedDBkey();
 473                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 474                         }
 475                 }
 476
 477                 # use the default model for this page
 478                 return $this->mTitle->getContentModel();
 479         }
 480
 481         /**
 482          * Loads page_touched and returns a value indicating if it should be used
 483          * @return boolean true if not a redirect
 484          */
 485         public function checkTouched() {
 486                 if ( !$this->mDataLoaded ) {
 487                         $this->loadPageData();
 488                 }
 489                 return !$this->mIsRedirect;
 490         }
 491
 492         /**
 493          * Get the page_touched field
 494          * @return string containing GMT timestamp
 495          */
 496         public function getTouched() {
 497                 if ( !$this->mDataLoaded ) {
 498                         $this->loadPageData();
 499                 }
 500                 return $this->mTouched;
 501         }
 502
 503         /**
 504          * Get the page_latest field
 505          * @return integer rev_id of current revision
 506          */
 507         public function getLatest() {
 508                 if ( !$this->mDataLoaded ) {
 509                         $this->loadPageData();
 510                 }
 511                 return (int)$this->mLatest;
 512         }
 513
 514         /**
 515          * Get the Revision object of the oldest revision
 516          * @return Revision|null
 517          */
 518         public function getOldestRevision() {
 519                 wfProfileIn( __METHOD__ );
 520
 521                 // Try using the slave database first, then try the master
 522                 $continue = 2;
 523                 $db = wfGetDB( DB_SLAVE );
 524                 $revSelectFields = Revision::selectFields();
 525
 526                 while ( $continue ) {
 527                         $row = $db->selectRow(
 528                                 array( 'page', 'revision' ),
 529                                 $revSelectFields,
 530                                 array(
 531                                         'page_namespace' => $this->mTitle->getNamespace(),
 532                                         'page_title' => $this->mTitle->getDBkey(),
 533                                         'rev_page = page_id'
 534                                 ),
 535                                 __METHOD__,
 536                                 array(
 537                                         'ORDER BY' => 'rev_timestamp ASC'
 538                                 )
 539                         );
 540
 541                         if ( $row ) {
 542                                 $continue = 0;
 543                         } else {
 544                                 $db = wfGetDB( DB_MASTER );
 545                                 $continue--;
 546                         }
 547                 }
 548
 549                 wfProfileOut( __METHOD__ );
 550                 return $row ? Revision::newFromRow( $row ) : null;
 551         }
 552
 553         /**
 554          * Loads everything except the text
 555          * This isn't necessary for all uses, so it's only done if needed.
 556          */
 557         protected function loadLastEdit() {
 558                 if ( $this->mLastRevision !== null ) {
 559                         return; // already loaded
 560                 }
 561
 562                 $latest = $this->getLatest();
 563                 if ( !$latest ) {
 564                         return; // page doesn't exist or is missing page_latest info
 565                 }
 566
 567                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 568                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 569                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 570                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 571                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 572                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 573                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 574                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 575                 if ( $revision ) { // sanity
 576                         $this->setLastEdit( $revision );
 577                 }
 578         }
 579
 580         /**
 581          * Set the latest revision
 582          */
 583         protected function setLastEdit( Revision $revision ) {
 584                 $this->mLastRevision = $revision;
 585                 $this->mTimestamp = $revision->getTimestamp();
 586         }
 587
 588         /**
 589          * Get the latest revision
 590          * @return Revision|null
 591          */
 592         public function getRevision() {
 593                 $this->loadLastEdit();
 594                 if ( $this->mLastRevision ) {
 595                         return $this->mLastRevision;
 596                 }
 597                 return null;
 598         }
 599
 600         /**
 601          * Get the content of the current revision. No side-effects...
 602          *
 603          * @param $audience Integer: one of:
 604          *      Revision::FOR_PUBLIC       to be displayed to all users
 605          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 606          *      Revision::RAW              get the text regardless of permissions
 607          * @param $user User object to check for, only if FOR_THIS_USER is passed
 608          *              to the $audience parameter
 609          * @return Content|null The content of the current revision
 610          *
 611          * @since 1.21
 612          */
 613         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 614                 $this->loadLastEdit();
 615                 if ( $this->mLastRevision ) {
 616                         return $this->mLastRevision->getContent( $audience );
 617                 }
 618                 return null;
 619         }
 620
 621         /**
 622          * Get the text of the current revision. No side-effects...
 623          *
 624          * @param $audience Integer: one of:
 625          *      Revision::FOR_PUBLIC       to be displayed to all users
 626          *      Revision::FOR_THIS_USER    to be displayed to the given user
 627          *      Revision::RAW              get the text regardless of permissions
 628          * @param $user User object to check for, only if FOR_THIS_USER is passed
 629          *              to the $audience parameter
 630          * @return String|false The text of the current revision
 631          * @deprecated as of 1.21, getContent() should be used instead.
 632          */
 633         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { #@todo: deprecated, replace usage!
 634                 ContentHandler::deprecated( __METHOD__, '1.21' );
 635
 636                 $this->loadLastEdit();
 637                 if ( $this->mLastRevision ) {
 638                         return $this->mLastRevision->getText( $audience, $user );
 639                 }
 640                 return false;
 641         }
 642
 643         /**
 644          * Get the text of the current revision. No side-effects...
 645          *
 646          * @return String|bool The text of the current revision. False on failure
 647          * @deprecated as of 1.21, getContent() should be used instead.
 648          */
 649         public function getRawText() {
 650                 ContentHandler::deprecated( __METHOD__, '1.21' );
 651
 652                 return $this->getText( Revision::RAW );
 653         }
 654
 655         /**
 656          * @return string MW timestamp of last article revision
 657          */
 658         public function getTimestamp() {
 659                 // Check if the field has been filled by WikiPage::setTimestamp()
 660                 if ( !$this->mTimestamp ) {
 661                         $this->loadLastEdit();
 662                 }
 663
 664                 return wfTimestamp( TS_MW, $this->mTimestamp );
 665         }
 666
 667         /**
 668          * Set the page timestamp (use only to avoid DB queries)
 669          * @param $ts string MW timestamp of last article revision
 670          * @return void
 671          */
 672         public function setTimestamp( $ts ) {
 673                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 674         }
 675
 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 int user ID for the user that made the last article revision
 684          */
 685         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 686                 $this->loadLastEdit();
 687                 if ( $this->mLastRevision ) {
 688                         return $this->mLastRevision->getUser( $audience, $user );
 689                 } else {
 690                         return -1;
 691                 }
 692         }
 693
 694         /**
 695          * Get the User object of the user who created the page
 696          * @param $audience Integer: one of:
 697          *      Revision::FOR_PUBLIC       to be displayed to all users
 698          *      Revision::FOR_THIS_USER    to be displayed to the given user
 699          *      Revision::RAW              get the text regardless of permissions
 700          * @param $user User object to check for, only if FOR_THIS_USER is passed
 701          *              to the $audience parameter
 702          * @return User|null
 703          */
 704         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 705                 $revision = $this->getOldestRevision();
 706                 if ( $revision ) {
 707                         $userName = $revision->getUserText( $audience, $user );
 708                         return User::newFromName( $userName, false );
 709                 } else {
 710                         return null;
 711                 }
 712         }
 713
 714         /**
 715          * @param $audience Integer: one of:
 716          *      Revision::FOR_PUBLIC       to be displayed to all users
 717          *      Revision::FOR_THIS_USER    to be displayed to the given user
 718          *      Revision::RAW              get the text regardless of permissions
 719          * @param $user User object to check for, only if FOR_THIS_USER is passed
 720          *              to the $audience parameter
 721          * @return string username of the user that made the last article revision
 722          */
 723         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 724                 $this->loadLastEdit();
 725                 if ( $this->mLastRevision ) {
 726                         return $this->mLastRevision->getUserText( $audience, $user );
 727                 } else {
 728                         return '';
 729                 }
 730         }
 731
 732         /**
 733          * @param $audience Integer: one of:
 734          *      Revision::FOR_PUBLIC       to be displayed to all users
 735          *      Revision::FOR_THIS_USER    to be displayed to the given user
 736          *      Revision::RAW              get the text regardless of permissions
 737          * @param $user User object to check for, only if FOR_THIS_USER is passed
 738          *              to the $audience parameter
 739          * @return string Comment stored for the last article revision
 740          */
 741         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 742                 $this->loadLastEdit();
 743                 if ( $this->mLastRevision ) {
 744                         return $this->mLastRevision->getComment( $audience, $user );
 745                 } else {
 746                         return '';
 747                 }
 748         }
 749
 750         /**
 751          * Returns true if last revision was marked as "minor edit"
 752          *
 753          * @return boolean Minor edit indicator for the last article revision.
 754          */
 755         public function getMinorEdit() {
 756                 $this->loadLastEdit();
 757                 if ( $this->mLastRevision ) {
 758                         return $this->mLastRevision->isMinor();
 759                 } else {
 760                         return false;
 761                 }
 762         }
 763
 764         /**
 765          * Get the cached timestamp for the last time the page changed.
 766          * This is only used to help handle slave lag by comparing to page_touched.
 767          * @return string MW timestamp
 768          */
 769         protected function getCachedLastEditTime() {
 770                 global $wgMemc;
 771                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 772                 return $wgMemc->get( $key );
 773         }
 774
 775         /**
 776          * Set the cached timestamp for the last time the page changed.
 777          * This is only used to help handle slave lag by comparing to page_touched.
 778          * @param $timestamp string
 779          * @return void
 780          */
 781         public function setCachedLastEditTime( $timestamp ) {
 782                 global $wgMemc;
 783                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 784                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 785         }
 786
 787         /**
 788          * Determine whether a page would be suitable for being counted as an
 789          * article in the site_stats table based on the title & its content
 790          *
 791          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 792          *        if false, the current database state will be used
 793          * @return Boolean
 794          */
 795         public function isCountable( $editInfo = false ) {
 796                 global $wgArticleCountMethod;
 797
 798                 if ( !$this->mTitle->isContentPage() ) {
 799                         return false;
 800                 }
 801
 802                 if ( $editInfo ) {
 803                         $content = $editInfo->pstContent;
 804                 } else {
 805                         $content = $this->getContent();
 806                 }
 807
 808                 if ( !$content || $content->isRedirect( ) ) {
 809                         return false;
 810                 }
 811
 812                 $hasLinks = null;
 813
 814                 if ( $wgArticleCountMethod === 'link' ) {
 815                         # nasty special case to avoid re-parsing to detect links
 816
 817                         if ( $editInfo ) {
 818                                 // ParserOutput::getLinks() is a 2D array of page links, so
 819                                 // to be really correct we would need to recurse in the array
 820                                 // but the main array should only have items in it if there are
 821                                 // links.
 822                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 823                         } else {
 824                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 825                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 826                         }
 827                 }
 828
 829                 return $content->isCountable( $hasLinks );
 830         }
 831
 832         /**
 833          * If this page is a redirect, get its target
 834          *
 835          * The target will be fetched from the redirect table if possible.
 836          * If this page doesn't have an entry there, call insertRedirect()
 837          * @return Title|mixed object, or null if this page is not a redirect
 838          */
 839         public function getRedirectTarget() {
 840                 if ( !$this->mTitle->isRedirect() ) {
 841                         return null;
 842                 }
 843
 844                 if ( $this->mRedirectTarget !== null ) {
 845                         return $this->mRedirectTarget;
 846                 }
 847
 848                 # Query the redirect table
 849                 $dbr = wfGetDB( DB_SLAVE );
 850                 $row = $dbr->selectRow( 'redirect',
 851                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 852                         array( 'rd_from' => $this->getId() ),
 853                         __METHOD__
 854                 );
 855
 856                 // rd_fragment and rd_interwiki were added later, populate them if empty
 857                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 858                         return $this->mRedirectTarget = Title::makeTitle(
 859                                 $row->rd_namespace, $row->rd_title,
 860                                 $row->rd_fragment, $row->rd_interwiki );
 861                 }
 862
 863                 # This page doesn't have an entry in the redirect table
 864                 return $this->mRedirectTarget = $this->insertRedirect();
 865         }
 866
 867         /**
 868          * Insert an entry for this page into the redirect table.
 869          *
 870          * Don't call this function directly unless you know what you're doing.
 871          * @return Title object or null if not a redirect
 872          */
 873         public function insertRedirect() {
 874                 // recurse through to only get the final target
 875                 $content = $this->getContent();
 876                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 877                 if ( !$retval ) {
 878                         return null;
 879                 }
 880                 $this->insertRedirectEntry( $retval );
 881                 return $retval;
 882         }
 883
 884         /**
 885          * Insert or update the redirect table entry for this page to indicate
 886          * it redirects to $rt .
 887          * @param $rt Title redirect target
 888          */
 889         public function insertRedirectEntry( $rt ) {
 890                 $dbw = wfGetDB( DB_MASTER );
 891                 $dbw->replace( 'redirect', array( 'rd_from' ),
 892                         array(
 893                                 'rd_from'      => $this->getId(),
 894                                 'rd_namespace' => $rt->getNamespace(),
 895                                 'rd_title'     => $rt->getDBkey(),
 896                                 'rd_fragment'  => $rt->getFragment(),
 897                                 'rd_interwiki' => $rt->getInterwiki(),
 898                         ),
 899                         __METHOD__
 900                 );
 901         }
 902
 903         /**
 904          * Get the Title object or URL this page redirects to
 905          *
 906          * @return mixed false, Title of in-wiki target, or string with URL
 907          */
 908         public function followRedirect() {
 909                 return $this->getRedirectURL( $this->getRedirectTarget() );
 910         }
 911
 912         /**
 913          * Get the Title object or URL to use for a redirect. We use Title
 914          * objects for same-wiki, non-special redirects and URLs for everything
 915          * else.
 916          * @param $rt Title Redirect target
 917          * @return mixed false, Title object of local target, or string with URL
 918          */
 919         public function getRedirectURL( $rt ) {
 920                 if ( !$rt ) {
 921                         return false;
 922                 }
 923
 924                 if ( $rt->isExternal() ) {
 925                         if ( $rt->isLocal() ) {
 926                                 // Offsite wikis need an HTTP redirect.
 927                                 //
 928                                 // This can be hard to reverse and may produce loops,
 929                                 // so they may be disabled in the site configuration.
 930                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 931                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 932                         } else {
 933                                 // External pages pages without "local" bit set are not valid
 934                                 // redirect targets
 935                                 return false;
 936                         }
 937                 }
 938
 939                 if ( $rt->isSpecialPage() ) {
 940                         // Gotta handle redirects to special pages differently:
 941                         // Fill the HTTP response "Location" header and ignore
 942                         // the rest of the page we're on.
 943                         //
 944                         // Some pages are not valid targets
 945                         if ( $rt->isValidRedirectTarget() ) {
 946                                 return $rt->getFullURL();
 947                         } else {
 948                                 return false;
 949                         }
 950                 }
 951
 952                 return $rt;
 953         }
 954
 955         /**
 956          * Get a list of users who have edited this article, not including the user who made
 957          * the most recent revision, which you can get from $article->getUser() if you want it
 958          * @return UserArrayFromResult
 959          */
 960         public function getContributors() {
 961                 # @todo FIXME: This is expensive; cache this info somewhere.
 962
 963                 $dbr = wfGetDB( DB_SLAVE );
 964
 965                 if ( $dbr->implicitGroupby() ) {
 966                         $realNameField = 'user_real_name';
 967                 } else {
 968                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 969                 }
 970
 971                 $tables = array( 'revision', 'user' );
 972
 973                 $fields = array(
 974                         'user_id' => 'rev_user',
 975                         'user_name' => 'rev_user_text',
 976                         $realNameField,
 977                         'timestamp' => 'MAX(rev_timestamp)',
 978                 );
 979
 980                 $conds = array( 'rev_page' => $this->getId() );
 981
 982                 // The user who made the top revision gets credited as "this page was last edited by
 983                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 984                 $user = $this->getUser();
 985                 if ( $user ) {
 986                         $conds[] = "rev_user != $user";
 987                 } else {
 988                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 989                 }
 990
 991                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 992
 993                 $jconds = array(
 994                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 995                 );
 996
 997                 $options = array(
 998                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 999                         'ORDER BY' => 'timestamp DESC',
1000                 );
1001
1002                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1003                 return new UserArrayFromResult( $res );
1004         }
1005
1006         /**
1007          * Get the last N authors
1008          * @param $num Integer: number of revisions to get
1009          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1010          * @return array Array of authors, duplicates not removed
1011          */
1012         public function getLastNAuthors( $num, $revLatest = 0 ) {
1013                 wfProfileIn( __METHOD__ );
1014                 // First try the slave
1015                 // If that doesn't have the latest revision, try the master
1016                 $continue = 2;
1017                 $db = wfGetDB( DB_SLAVE );
1018
1019                 do {
1020                         $res = $db->select( array( 'page', 'revision' ),
1021                                 array( 'rev_id', 'rev_user_text' ),
1022                                 array(
1023                                         'page_namespace' => $this->mTitle->getNamespace(),
1024                                         'page_title' => $this->mTitle->getDBkey(),
1025                                         'rev_page = page_id'
1026                                 ), __METHOD__,
1027                                 array(
1028                                         'ORDER BY' => 'rev_timestamp DESC',
1029                                         'LIMIT' => $num
1030                                 )
1031                         );
1032
1033                         if ( !$res ) {
1034                                 wfProfileOut( __METHOD__ );
1035                                 return array();
1036                         }
1037
1038                         $row = $db->fetchObject( $res );
1039
1040                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1041                                 $db = wfGetDB( DB_MASTER );
1042                                 $continue--;
1043                         } else {
1044                                 $continue = 0;
1045                         }
1046                 } while ( $continue );
1047
1048                 $authors = array( $row->rev_user_text );
1049
1050                 foreach ( $res as $row ) {
1051                         $authors[] = $row->rev_user_text;
1052                 }
1053
1054                 wfProfileOut( __METHOD__ );
1055                 return $authors;
1056         }
1057
1058         /**
1059          * Should the parser cache be used?
1060          *
1061          * @param $parserOptions ParserOptions to check
1062          * @param $oldid int
1063          * @return boolean
1064          */
1065         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1066                 global $wgEnableParserCache;
1067
1068                 return $wgEnableParserCache
1069                         && $parserOptions->getStubThreshold() == 0
1070                         && $this->mTitle->exists()
1071                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1072                         && $this->getContentHandler()->isParserCacheSupported();
1073         }
1074
1075         /**
1076          * Get a ParserOutput for the given ParserOptions and revision ID.
1077          * The parser cache will be used if possible.
1078          *
1079          * @since 1.19
1080          * @param $parserOptions ParserOptions to use for the parse operation
1081          * @param $oldid Revision ID to get the text from, passing null or 0 will
1082          *               get the current revision (default value)
1083          *
1084          * @return ParserOutput or false if the revision was not found
1085          */
1086         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1087                 wfProfileIn( __METHOD__ );
1088
1089                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1090                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1091                 if ( $parserOptions->getStubThreshold() ) {
1092                         wfIncrStats( 'pcache_miss_stub' );
1093                 }
1094
1095                 if ( $useParserCache ) {
1096                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1097                         if ( $parserOutput !== false ) {
1098                                 wfProfileOut( __METHOD__ );
1099                                 return $parserOutput;
1100                         }
1101                 }
1102
1103                 if ( $oldid === null || $oldid === 0 ) {
1104                         $oldid = $this->getLatest();
1105                 }
1106
1107                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1108                 $pool->execute();
1109
1110                 wfProfileOut( __METHOD__ );
1111
1112                 return $pool->getParserOutput();
1113         }
1114
1115         /**
1116          * Do standard deferred updates after page view
1117          * @param $user User The relevant user
1118          */
1119         public function doViewUpdates( User $user ) {
1120                 global $wgDisableCounters;
1121                 if ( wfReadOnly() ) {
1122                         return;
1123                 }
1124
1125                 # Don't update page view counters on views from bot users (bug 14044)
1126                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1127                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1128                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1129                 }
1130
1131                 # Update newtalk / watchlist notification status
1132                 $user->clearNotification( $this->mTitle );
1133         }
1134
1135         /**
1136          * Perform the actions of a page purging
1137          * @return bool
1138          */
1139         public function doPurge() {
1140                 global $wgUseSquid;
1141
1142                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1143                         return false;
1144                 }
1145
1146                 // Invalidate the cache
1147                 $this->mTitle->invalidateCache();
1148                 $this->clear();
1149
1150                 if ( $wgUseSquid ) {
1151                         // Commit the transaction before the purge is sent
1152                         $dbw = wfGetDB( DB_MASTER );
1153                         $dbw->commit( __METHOD__ );
1154
1155                         // Send purge
1156                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1157                         $update->doUpdate();
1158                 }
1159
1160                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1161                         //@todo: move this logic to MessageCache
1162
1163                         if ( $this->mTitle->exists() ) {
1164                                 // NOTE: use transclusion text for messages.
1165                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1166
1167                                 $content = $this->getContent();
1168                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1169
1170                                 if ( $text === null ) $text = false;
1171                         } else {
1172                                 $text = false;
1173                         }
1174
1175                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1176                 }
1177                 return true;
1178         }
1179
1180         /**
1181          * Insert a new empty page record for this article.
1182          * This *must* be followed up by creating a revision
1183          * and running $this->updateRevisionOn( ... );
1184          * or else the record will be left in a funky state.
1185          * Best if all done inside a transaction.
1186          *
1187          * @param $dbw DatabaseBase
1188          * @return int The newly created page_id key, or false if the title already existed
1189          */
1190         public function insertOn( $dbw ) {
1191                 wfProfileIn( __METHOD__ );
1192
1193                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1194                 $dbw->insert( 'page', array(
1195                         'page_id'           => $page_id,
1196                         'page_namespace'    => $this->mTitle->getNamespace(),
1197                         'page_title'        => $this->mTitle->getDBkey(),
1198                         'page_counter'      => 0,
1199                         'page_restrictions' => '',
1200                         'page_is_redirect'  => 0, # Will set this shortly...
1201                         'page_is_new'       => 1,
1202                         'page_random'       => wfRandom(),
1203                         'page_touched'      => $dbw->timestamp(),
1204                         'page_latest'       => 0, # Fill this in shortly...
1205                         'page_len'          => 0, # Fill this in shortly...
1206                 ), __METHOD__, 'IGNORE' );
1207
1208                 $affected = $dbw->affectedRows();
1209
1210                 if ( $affected ) {
1211                         $newid = $dbw->insertId();
1212                         $this->mTitle->resetArticleID( $newid );
1213                 }
1214                 wfProfileOut( __METHOD__ );
1215
1216                 return $affected ? $newid : false;
1217         }
1218
1219         /**
1220          * Update the page record to point to a newly saved revision.
1221          *
1222          * @param $dbw DatabaseBase: object
1223          * @param $revision Revision: For ID number, and text used to set
1224          *                  length and redirect status fields
1225          * @param $lastRevision Integer: if given, will not overwrite the page field
1226          *                      when different from the currently set value.
1227          *                      Giving 0 indicates the new page flag should be set
1228          *                      on.
1229          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1230          *                           removing rows in redirect table.
1231          * @return bool true on success, false on failure
1232          * @private
1233          */
1234         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1235                 global $wgContentHandlerUseDB;
1236
1237                 wfProfileIn( __METHOD__ );
1238
1239                 $content = $revision->getContent();
1240                 $len = $content ? $content->getSize() : 0;
1241                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1242
1243                 $conditions = array( 'page_id' => $this->getId() );
1244
1245                 if ( !is_null( $lastRevision ) ) {
1246                         # An extra check against threads stepping on each other
1247                         $conditions['page_latest'] = $lastRevision;
1248                 }
1249
1250                 $now = wfTimestampNow();
1251                 $row = array( /* SET */
1252                         'page_latest'      => $revision->getId(),
1253                         'page_touched'     => $dbw->timestamp( $now ),
1254                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1255                         'page_is_redirect' => $rt !== null ? 1 : 0,
1256                         'page_len'         => $len,
1257                 );
1258
1259                 if ( $wgContentHandlerUseDB ) {
1260                         $row[ 'page_content_model' ] = $revision->getContentModel();
1261                 }
1262
1263                 $dbw->update( 'page',
1264                         $row,
1265                         $conditions,
1266                         __METHOD__ );
1267
1268                 $result = $dbw->affectedRows() > 0;
1269                 if ( $result ) {
1270                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1271                         $this->setLastEdit( $revision );
1272                         $this->setCachedLastEditTime( $now );
1273                         $this->mLatest = $revision->getId();
1274                         $this->mIsRedirect = (bool)$rt;
1275                         # Update the LinkCache.
1276                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1277                                                                                                         $this->mLatest, $revision->getContentModel() );
1278                 }
1279
1280                 wfProfileOut( __METHOD__ );
1281                 return $result;
1282         }
1283
1284         /**
1285          * Add row to the redirect table if this is a redirect, remove otherwise.
1286          *
1287          * @param $dbw DatabaseBase
1288          * @param $redirectTitle Title object pointing to the redirect target,
1289          *                       or NULL if this is not a redirect
1290          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1291          *                           removing rows in redirect table.
1292          * @return bool true on success, false on failure
1293          * @private
1294          */
1295         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1296                 // Always update redirects (target link might have changed)
1297                 // Update/Insert if we don't know if the last revision was a redirect or not
1298                 // Delete if changing from redirect to non-redirect
1299                 $isRedirect = !is_null( $redirectTitle );
1300
1301                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1302                         return true;
1303                 }
1304
1305                 wfProfileIn( __METHOD__ );
1306                 if ( $isRedirect ) {
1307                         $this->insertRedirectEntry( $redirectTitle );
1308                 } else {
1309                         // This is not a redirect, remove row from redirect table
1310                         $where = array( 'rd_from' => $this->getId() );
1311                         $dbw->delete( 'redirect', $where, __METHOD__ );
1312                 }
1313
1314                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1315                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1316                 }
1317                 wfProfileOut( __METHOD__ );
1318
1319                 return ( $dbw->affectedRows() != 0 );
1320         }
1321
1322         /**
1323          * If the given revision is newer than the currently set page_latest,
1324          * update the page record. Otherwise, do nothing.
1325          *
1326          * @param $dbw DatabaseBase object
1327          * @param $revision Revision object
1328          * @return mixed
1329          */
1330         public function updateIfNewerOn( $dbw, $revision ) {
1331                 wfProfileIn( __METHOD__ );
1332
1333                 $row = $dbw->selectRow(
1334                         array( 'revision', 'page' ),
1335                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1336                         array(
1337                                 'page_id' => $this->getId(),
1338                                 'page_latest=rev_id' ),
1339                         __METHOD__ );
1340
1341                 if ( $row ) {
1342                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1343                                 wfProfileOut( __METHOD__ );
1344                                 return false;
1345                         }
1346                         $prev = $row->rev_id;
1347                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1348                 } else {
1349                         # No or missing previous revision; mark the page as new
1350                         $prev = 0;
1351                         $lastRevIsRedirect = null;
1352                 }
1353
1354                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1355
1356                 wfProfileOut( __METHOD__ );
1357                 return $ret;
1358         }
1359
1360         /**
1361          * Get the content that needs to be saved in order to undo all revisions
1362          * between $undo and $undoafter. Revisions must belong to the same page,
1363          * must exist and must not be deleted
1364          * @param $undo Revision
1365          * @param $undoafter Revision Must be an earlier revision than $undo
1366          * @return mixed string on success, false on failure
1367          * @since 1.21
1368          * Before we had the Content object, this was done in getUndoText
1369          */
1370         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1371                 $handler = $undo->getContentHandler();
1372                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1373         }
1374
1375         /**
1376          * Get the text that needs to be saved in order to undo all revisions
1377          * between $undo and $undoafter. Revisions must belong to the same page,
1378          * must exist and must not be deleted
1379          * @param $undo Revision
1380          * @param $undoafter Revision Must be an earlier revision than $undo
1381          * @return mixed string on success, false on failure
1382          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1383          */
1384         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1385                 ContentHandler::deprecated( __METHOD__, '1.21' );
1386
1387                 $this->loadLastEdit();
1388
1389                 if ( $this->mLastRevision ) {
1390                         if ( is_null( $undoafter ) ) {
1391                                 $undoafter = $undo->getPrevious();
1392                         }
1393
1394                         $handler = $this->getContentHandler();
1395                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1396
1397                         if ( !$undone ) {
1398                                 return false;
1399                         } else {
1400                                 return ContentHandler::getContentText( $undone );
1401                         }
1402                 }
1403
1404                 return false;
1405         }
1406
1407         /**
1408          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1409          * @param $text String: new text of the section
1410          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1411          * @param $edittime String: revision timestamp or null to use the current revision
1412          * @throws MWException
1413          * @return String new complete article text, or null if error
1414          *
1415          * @deprecated since 1.21, use replaceSectionContent() instead
1416          */
1417         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1418                 ContentHandler::deprecated( __METHOD__, '1.21' );
1419
1420                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1421                         // Whole-page edit; let the whole text through
1422                         return $text;
1423                 }
1424
1425                 if ( !$this->supportsSections() ) {
1426                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1427                 }
1428
1429                 # could even make section title, but that's not required.
1430                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1431
1432                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1433
1434                 return ContentHandler::getContentText( $newContent );
1435         }
1436
1437         /**
1438          * Returns true iff this page's content model supports sections.
1439          *
1440          * @return boolean whether sections are supported.
1441          *
1442          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1443          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1444          */
1445         public function supportsSections() {
1446                 return $this->getContentHandler()->supportsSections();
1447         }
1448
1449         /**
1450          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1451          * @param $sectionContent Content: new content of the section
1452          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1453          * @param $edittime String: revision timestamp or null to use the current revision
1454          *
1455          * @throws MWException
1456          * @return Content new complete article content, or null if error
1457          *
1458          * @since 1.21
1459          */
1460         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1461                 wfProfileIn( __METHOD__ );
1462
1463                 if ( strval( $section ) == '' ) {
1464                         // Whole-page edit; let the whole text through
1465                         $newContent = $sectionContent;
1466                 } else {
1467                         if ( !$this->supportsSections() ) {
1468                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1469                         }
1470
1471                         // Bug 30711: always use current version when adding a new section
1472                         if ( is_null( $edittime ) || $section == 'new' ) {
1473                                 $oldContent = $this->getContent();
1474                         } else {
1475                                 $dbw = wfGetDB( DB_MASTER );
1476                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1477
1478                                 if ( !$rev ) {
1479                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1480                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1481                                         wfProfileOut( __METHOD__ );
1482                                         return null;
1483                                 }
1484
1485                                 $oldContent = $rev->getContent();
1486                         }
1487
1488                         if ( ! $oldContent ) {
1489                                 wfDebug( __METHOD__ . ": no page text\n" );
1490                                 wfProfileOut( __METHOD__ );
1491                                 return null;
1492                         }
1493
1494                         //FIXME: $oldContent might be null?
1495                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1496                 }
1497
1498                 wfProfileOut( __METHOD__ );
1499                 return $newContent;
1500         }
1501
1502         /**
1503          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1504          * @param $flags Int
1505          * @return Int updated $flags
1506          */
1507         function checkFlags( $flags ) {
1508                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1509                         if ( $this->mTitle->getArticleID() ) {
1510                                 $flags |= EDIT_UPDATE;
1511                         } else {
1512                                 $flags |= EDIT_NEW;
1513                         }
1514                 }
1515
1516                 return $flags;
1517         }
1518
1519         /**
1520          * Change an existing article or create a new article. Updates RC and all necessary caches,
1521          * optionally via the deferred update array.
1522          *
1523          * @param $text String: new text
1524          * @param $summary String: edit summary
1525          * @param $flags Integer bitfield:
1526          *      EDIT_NEW
1527          *          Article is known or assumed to be non-existent, create a new one
1528          *      EDIT_UPDATE
1529          *          Article is known or assumed to be pre-existing, update it
1530          *      EDIT_MINOR
1531          *          Mark this edit minor, if the user is allowed to do so
1532          *      EDIT_SUPPRESS_RC
1533          *          Do not log the change in recentchanges
1534          *      EDIT_FORCE_BOT
1535          *          Mark the edit a "bot" edit regardless of user rights
1536          *      EDIT_DEFER_UPDATES
1537          *          Defer some of the updates until the end of index.php
1538          *      EDIT_AUTOSUMMARY
1539          *          Fill in blank summaries with generated text where possible
1540          *
1541          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1542          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1543          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1544          * edit-already-exists error will be returned. These two conditions are also possible with
1545          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1546          *
1547          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1548          * @param $user User the user doing the edit
1549          *
1550          * @throws MWException
1551          * @return Status object. Possible errors:
1552          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1553          *     edit-gone-missing:       In update mode, but the article didn't exist
1554          *     edit-conflict:           In update mode, the article changed unexpectedly
1555          *     edit-no-change:          Warning that the text was the same as before
1556          *     edit-already-exists:     In creation mode, but the article already exists
1557          *
1558          *  Extensions may define additional errors.
1559          *
1560          *  $return->value will contain an associative array with members as follows:
1561          *     new:                     Boolean indicating if the function attempted to create a new article
1562          *     revision:                The revision object for the inserted revision, or null
1563          *
1564          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1565          *
1566          * @deprecated since 1.21: use doEditContent() instead.
1567          */
1568         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1569                 ContentHandler::deprecated( __METHOD__, '1.21' );
1570
1571                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1572
1573                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1574         }
1575
1576         /**
1577          * Change an existing article or create a new article. Updates RC and all necessary caches,
1578          * optionally via the deferred update array.
1579          *
1580          * @param $content Content: new content
1581          * @param $summary String: edit summary
1582          * @param $flags Integer bitfield:
1583          *      EDIT_NEW
1584          *          Article is known or assumed to be non-existent, create a new one
1585          *      EDIT_UPDATE
1586          *          Article is known or assumed to be pre-existing, update it
1587          *      EDIT_MINOR
1588          *          Mark this edit minor, if the user is allowed to do so
1589          *      EDIT_SUPPRESS_RC
1590          *          Do not log the change in recentchanges
1591          *      EDIT_FORCE_BOT
1592          *          Mark the edit a "bot" edit regardless of user rights
1593          *      EDIT_DEFER_UPDATES
1594          *          Defer some of the updates until the end of index.php
1595          *      EDIT_AUTOSUMMARY
1596          *          Fill in blank summaries with generated text where possible
1597          *
1598          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1599          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1600          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1601          * edit-already-exists error will be returned. These two conditions are also possible with
1602          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1603          *
1604          * @param bool|\the $baseRevId the revision ID this edit was based off, if any
1605          * @param $user User the user doing the edit
1606          * @param $serialisation_format String: format for storing the content in the database
1607          *
1608          * @throws MWException
1609          * @return Status object. Possible errors:
1610          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1611          *     edit-gone-missing:       In update mode, but the article didn't exist
1612          *     edit-conflict:           In update mode, the article changed unexpectedly
1613          *     edit-no-change:          Warning that the text was the same as before
1614          *     edit-already-exists:     In creation mode, but the article already exists
1615          *
1616          *  Extensions may define additional errors.
1617          *
1618          *  $return->value will contain an associative array with members as follows:
1619          *     new:                     Boolean indicating if the function attempted to create a new article
1620          *     revision:                The revision object for the inserted revision, or null
1621          *
1622          * @since 1.21
1623          */
1624         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1625                                                                    User $user = null, $serialisation_format = null ) {
1626                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1627
1628                 # Low-level sanity check
1629                 if ( $this->mTitle->getText() === '' ) {
1630                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1631                 }
1632
1633                 wfProfileIn( __METHOD__ );
1634
1635                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1636                         wfProfileOut( __METHOD__ );
1637                         return Status::newFatal( 'content-not-allowed-here',
1638                                 ContentHandler::getLocalizedName( $content->getModel() ),
1639                                 $this->getTitle()->getPrefixedText() );
1640                 }
1641
1642                 $user = is_null( $user ) ? $wgUser : $user;
1643                 $status = Status::newGood( array() );
1644
1645                 // Load the data from the master database if needed.
1646                 // The caller may already loaded it from the master or even loaded it using
1647                 // SELECT FOR UPDATE, so do not override that using clear().
1648                 $this->loadPageData( 'fromdbmaster' );
1649
1650                 $flags = $this->checkFlags( $flags );
1651
1652                 # handle hook
1653                 $hook_args = array( &$this, &$user, &$content, &$summary,
1654                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1655
1656                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1657                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1658
1659                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1660
1661                         if ( $status->isOK() ) {
1662                                 $status->fatal( 'edit-hook-aborted' );
1663                         }
1664
1665                         wfProfileOut( __METHOD__ );
1666                         return $status;
1667                 }
1668
1669                 # Silently ignore EDIT_MINOR if not allowed
1670                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1671                 $bot = $flags & EDIT_FORCE_BOT;
1672
1673                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1674
1675                 $oldsize = $old_content ? $old_content->getSize() : 0;
1676                 $oldid = $this->getLatest();
1677                 $oldIsRedirect = $this->isRedirect();
1678                 $oldcountable = $this->isCountable();
1679
1680                 $handler = $content->getContentHandler();
1681
1682                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1683                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1684                         if ( !$old_content ) $old_content = null;
1685                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1686                 }
1687
1688                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1689                 $serialized = $editInfo->pst;
1690                 $content = $editInfo->pstContent;
1691                 $newsize =  $content->getSize();
1692
1693                 $dbw = wfGetDB( DB_MASTER );
1694                 $now = wfTimestampNow();
1695                 $this->mTimestamp = $now;
1696
1697                 if ( $flags & EDIT_UPDATE ) {
1698                         # Update article, but only if changed.
1699                         $status->value['new'] = false;
1700
1701                         if ( !$oldid ) {
1702                                 # Article gone missing
1703                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1704                                 $status->fatal( 'edit-gone-missing' );
1705
1706                                 wfProfileOut( __METHOD__ );
1707                                 return $status;
1708                         } elseif ( !$old_content ) {
1709                                 # Sanity check for bug 37225
1710                                 wfProfileOut( __METHOD__ );
1711                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1712                         }
1713
1714                         $revision = new Revision( array(
1715                                 'page'       => $this->getId(),
1716                                 'title'      => $this->getTitle(), // for determining the default content model
1717                                 'comment'    => $summary,
1718                                 'minor_edit' => $isminor,
1719                                 'text'       => $serialized,
1720                                 'len'        => $newsize,
1721                                 'parent_id'  => $oldid,
1722                                 'user'       => $user->getId(),
1723                                 'user_text'  => $user->getName(),
1724                                 'timestamp'  => $now,
1725                                 'content_model' => $content->getModel(),
1726                                 'content_format' => $serialisation_format,
1727                         ) ); #XXX: pass content object?!
1728
1729                         $changed = !$content->equals( $old_content );
1730
1731                         if ( $changed ) {
1732                                 if ( !$content->isValid() ) {
1733                                         throw new MWException( "New content failed validity check!" );
1734                                 }
1735
1736                                 $dbw->begin( __METHOD__ );
1737
1738                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1739                                 $status->merge( $prepStatus );
1740
1741                                 if ( !$status->isOK() ) {
1742                                         $dbw->rollback( __METHOD__ );
1743
1744                                         wfProfileOut( __METHOD__ );
1745                                         return $status;
1746                                 }
1747
1748                                 $revisionId = $revision->insertOn( $dbw );
1749
1750                                 # Update page
1751                                 #
1752                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1753                                 # during the course of this function. This makes sure that EditPage can detect
1754                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1755                                 # before this function is called. A previous function used a separate query, this
1756                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1757                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1758
1759                                 if ( !$ok ) {
1760                                         # Belated edit conflict! Run away!!
1761                                         $status->fatal( 'edit-conflict' );
1762
1763                                         $dbw->rollback( __METHOD__ );
1764
1765                                         wfProfileOut( __METHOD__ );
1766                                         return $status;
1767                                 }
1768
1769                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1770                                 # Update recentchanges
1771                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1772                                         # Mark as patrolled if the user can do so
1773                                         $patrolled = $wgUseRCPatrol && !count(
1774                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1775                                         # Add RC row to the DB
1776                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1777                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1778                                                 $revisionId, $patrolled
1779                                         );
1780
1781                                         # Log auto-patrolled edits
1782                                         if ( $patrolled ) {
1783                                                 PatrolLog::record( $rc, true, $user );
1784                                         }
1785                                 }
1786                                 $user->incEditCount();
1787                                 $dbw->commit( __METHOD__ );
1788                         } else {
1789                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1790                                 // related variables correctly
1791                                 $revision->setId( $this->getLatest() );
1792                         }
1793
1794                         # Update links tables, site stats, etc.
1795                         $this->doEditUpdates(
1796                                 $revision,
1797                                 $user,
1798                                 array(
1799                                         'changed' => $changed,
1800                                         'oldcountable' => $oldcountable
1801                                 )
1802                         );
1803
1804                         if ( !$changed ) {
1805                                 $status->warning( 'edit-no-change' );
1806                                 $revision = null;
1807                                 // Update page_touched, this is usually implicit in the page update
1808                                 // Other cache updates are done in onArticleEdit()
1809                                 $this->mTitle->invalidateCache();
1810                         }
1811                 } else {
1812                         # Create new article
1813                         $status->value['new'] = true;
1814
1815                         $dbw->begin( __METHOD__ );
1816
1817                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1818                         $status->merge( $prepStatus );
1819
1820                         if ( !$status->isOK() ) {
1821                                 $dbw->rollback( __METHOD__ );
1822
1823                                 wfProfileOut( __METHOD__ );
1824                                 return $status;
1825                         }
1826
1827                         $status->merge( $prepStatus );
1828
1829                         # Add the page record; stake our claim on this title!
1830                         # This will return false if the article already exists
1831                         $newid = $this->insertOn( $dbw );
1832
1833                         if ( $newid === false ) {
1834                                 $dbw->rollback( __METHOD__ );
1835                                 $status->fatal( 'edit-already-exists' );
1836
1837                                 wfProfileOut( __METHOD__ );
1838                                 return $status;
1839                         }
1840
1841                         # Save the revision text...
1842                         $revision = new Revision( array(
1843                                 'page'       => $newid,
1844                                 'title'      => $this->getTitle(), // for determining the default content model
1845                                 'comment'    => $summary,
1846                                 'minor_edit' => $isminor,
1847                                 'text'       => $serialized,
1848                                 'len'        => $newsize,
1849                                 'user'       => $user->getId(),
1850                                 'user_text'  => $user->getName(),
1851                                 'timestamp'  => $now,
1852                                 'content_model' => $content->getModel(),
1853                                 'content_format' => $serialisation_format,
1854                         ) );
1855                         $revisionId = $revision->insertOn( $dbw );
1856
1857                         # Bug 37225: use accessor to get the text as Revision may trim it
1858                         $content = $revision->getContent(); // sanity; get normalized version
1859
1860                         if ( $content ) {
1861                                 $newsize = $content->getSize();
1862                         }
1863
1864                         # Update the page record with revision data
1865                         $this->updateRevisionOn( $dbw, $revision, 0 );
1866
1867                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1868
1869                         # Update recentchanges
1870                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1871                                 # Mark as patrolled if the user can do so
1872                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1873                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1874                                 # Add RC row to the DB
1875                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1876                                         '', $newsize, $revisionId, $patrolled );
1877
1878                                 # Log auto-patrolled edits
1879                                 if ( $patrolled ) {
1880                                         PatrolLog::record( $rc, true, $user );
1881                                 }
1882                         }
1883                         $user->incEditCount();
1884                         $dbw->commit( __METHOD__ );
1885
1886                         # Update links, etc.
1887                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1888
1889                         $hook_args = array( &$this, &$user, $content, $summary,
1890                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1891
1892                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1893                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1894                 }
1895
1896                 # Do updates right now unless deferral was requested
1897                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1898                         DeferredUpdates::doUpdates();
1899                 }
1900
1901                 // Return the new revision (or null) to the caller
1902                 $status->value['revision'] = $revision;
1903
1904                 $hook_args = array( &$this, &$user, $content, $summary,
1905                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1906
1907                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1908                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1909
1910                 # Promote user to any groups they meet the criteria for
1911                 $user->addAutopromoteOnceGroups( 'onEdit' );
1912
1913                 wfProfileOut( __METHOD__ );
1914                 return $status;
1915         }
1916
1917         /**
1918          * Get parser options suitable for rendering the primary article wikitext
1919          *
1920          * @see ContentHandler::makeParserOptions
1921          *
1922          * @param IContextSource|User|string $context One of the following:
1923          *        - IContextSource: Use the User and the Language of the provided
1924          *          context
1925          *        - User: Use the provided User object and $wgLang for the language,
1926          *          so use an IContextSource object if possible.
1927          *        - 'canonical': Canonical options (anonymous user with default
1928          *          preferences and content language).
1929          * @return ParserOptions
1930          */
1931         public function makeParserOptions( $context ) {
1932                 $options = $this->getContentHandler()->makeParserOptions( $context );
1933
1934                 if ( $this->getTitle()->isConversionTable() ) {
1935                         //@todo: ConversionTable should become a separate content model, so we don't need special cases like this one.
1936                         $options->disableContentConversion();
1937                 }
1938
1939                 return $options;
1940         }
1941
1942         /**
1943          * Prepare text which is about to be saved.
1944          * Returns a stdclass with source, pst and output members
1945          *
1946          * @deprecated in 1.21: use prepareContentForEdit instead.
1947          */
1948         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1949                 ContentHandler::deprecated( __METHOD__, '1.21' );
1950                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1951                 return $this->prepareContentForEdit( $content, $revid , $user );
1952         }
1953
1954         /**
1955          * Prepare content which is about to be saved.
1956          * Returns a stdclass with source, pst and output members
1957          *
1958          * @param \Content $content
1959          * @param null $revid
1960          * @param null|\User $user
1961          * @param null $serialization_format
1962          *
1963          * @return bool|object
1964          *
1965          * @since 1.21
1966          */
1967         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1968                 global $wgContLang, $wgUser;
1969                 $user = is_null( $user ) ? $wgUser : $user;
1970                 //XXX: check $user->getId() here???
1971
1972                 if ( $this->mPreparedEdit
1973                         && $this->mPreparedEdit->newContent
1974                         && $this->mPreparedEdit->newContent->equals( $content )
1975                         && $this->mPreparedEdit->revid == $revid
1976                         && $this->mPreparedEdit->format == $serialization_format
1977                         #XXX: also check $user here?
1978                 ) {
1979                         // Already prepared
1980                         return $this->mPreparedEdit;
1981                 }
1982
1983                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1984                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1985
1986                 $edit = (object)array();
1987                 $edit->revid = $revid;
1988
1989                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
1990
1991                 $edit->format = $serialization_format;
1992                 $edit->popts = $this->makeParserOptions( 'canonical' );
1993                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
1994
1995                 $edit->newContent = $content;
1996                 $edit->oldContent = $this->getContent( Revision::RAW );
1997
1998                 #NOTE: B/C for hooks! don't use these fields!
1999                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2000                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2001                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2002
2003                 $this->mPreparedEdit = $edit;
2004                 return $edit;
2005         }
2006
2007         /**
2008          * Do standard deferred updates after page edit.
2009          * Update links tables, site stats, search index and message cache.
2010          * Purges pages that include this page if the text was changed here.
2011          * Every 100th edit, prune the recent changes table.
2012          *
2013          * @param $revision Revision object
2014          * @param $user User object that did the revision
2015          * @param $options Array of options, following indexes are used:
2016          * - changed: boolean, whether the revision changed the content (default true)
2017          * - created: boolean, whether the revision created the page (default false)
2018          * - oldcountable: boolean or null (default null):
2019          *   - boolean: whether the page was counted as an article before that
2020          *     revision, only used in changed is true and created is false
2021          *   - null: don't change the article count
2022          */
2023         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2024                 global $wgEnableParserCache;
2025
2026                 wfProfileIn( __METHOD__ );
2027
2028                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2029                 $content = $revision->getContent();
2030
2031                 # Parse the text
2032                 # Be careful not to double-PST: $text is usually already PST-ed once
2033                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2034                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2035                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2036                 } else {
2037                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2038                         $editInfo = $this->mPreparedEdit;
2039                 }
2040
2041                 # Save it to the parser cache
2042                 if ( $wgEnableParserCache ) {
2043                         $parserCache = ParserCache::singleton();
2044                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2045                 }
2046
2047                 # Update the links tables and other secondary data
2048                 if ( $content ) {
2049                         $updates = $content->getSecondaryDataUpdates( $this->getTitle(), null, true, $editInfo->output );
2050                         DataUpdate::runUpdates( $updates );
2051                 }
2052
2053                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2054
2055                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2056                         if ( 0 == mt_rand( 0, 99 ) ) {
2057                                 // Flush old entries from the `recentchanges` table; we do this on
2058                                 // random requests so as to avoid an increase in writes for no good reason
2059                                 global $wgRCMaxAge;
2060
2061                                 $dbw = wfGetDB( DB_MASTER );
2062                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2063                                 $dbw->delete(
2064                                         'recentchanges',
2065                                         array( "rc_timestamp < '$cutoff'" ),
2066                                         __METHOD__
2067                                 );
2068                         }
2069                 }
2070
2071                 if ( !$this->mTitle->exists() ) {
2072                         wfProfileOut( __METHOD__ );
2073                         return;
2074                 }
2075
2076                 $id = $this->getId();
2077                 $title = $this->mTitle->getPrefixedDBkey();
2078                 $shortTitle = $this->mTitle->getDBkey();
2079
2080                 if ( !$options['changed'] ) {
2081                         $good = 0;
2082                         $total = 0;
2083                 } elseif ( $options['created'] ) {
2084                         $good = (int)$this->isCountable( $editInfo );
2085                         $total = 1;
2086                 } elseif ( $options['oldcountable'] !== null ) {
2087                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2088                         $total = 0;
2089                 } else {
2090                         $good = 0;
2091                         $total = 0;
2092                 }
2093
2094                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2095                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
2096                 #@TODO: let the search engine decide what to do with the content object
2097
2098                 # If this is another user's talk page, update newtalk.
2099                 # Don't do this if $options['changed'] = false (null-edits) nor if
2100                 # it's a minor edit and the user doesn't want notifications for those.
2101                 if ( $options['changed']
2102                         && $this->mTitle->getNamespace() == NS_USER_TALK
2103                         && $shortTitle != $user->getTitleKey()
2104                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2105                 ) {
2106                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2107                                 $other = User::newFromName( $shortTitle, false );
2108                                 if ( !$other ) {
2109                                         wfDebug( __METHOD__ . ": invalid username\n" );
2110                                 } elseif ( User::isIP( $shortTitle ) ) {
2111                                         // An anonymous user
2112                                         $other->setNewtalk( true, $revision );
2113                                 } elseif ( $other->isLoggedIn() ) {
2114                                         $other->setNewtalk( true, $revision );
2115                                 } else {
2116                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2117                                 }
2118                         }
2119                 }
2120
2121                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2122                         #XXX: could skip pseudo-messages like js/css here, based on content model.
2123                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2124                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2125
2126                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2127                 }
2128
2129                 if( $options['created'] ) {
2130                         self::onArticleCreate( $this->mTitle );
2131                 } else {
2132                         self::onArticleEdit( $this->mTitle );
2133                 }
2134
2135                 wfProfileOut( __METHOD__ );
2136         }
2137
2138         /**
2139          * Edit an article without doing all that other stuff
2140          * The article must already exist; link tables etc
2141          * are not updated, caches are not flushed.
2142          *
2143          * @param $text String: text submitted
2144          * @param $user User The relevant user
2145          * @param $comment String: comment submitted
2146          * @param $minor Boolean: whereas it's a minor modification
2147          *
2148          * @deprecated since 1.21, use doEditContent() instead.
2149          */
2150         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2151                 ContentHandler::deprecated( __METHOD__, "1.21" );
2152
2153                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2154                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2155         }
2156
2157         /**
2158          * Edit an article without doing all that other stuff
2159          * The article must already exist; link tables etc
2160          * are not updated, caches are not flushed.
2161          *
2162          * @param $content Content: content submitted
2163          * @param $user User The relevant user
2164          * @param $comment String: comment submitted
2165          * @param $serialisation_format String: format for storing the content in the database
2166          * @param $minor Boolean: whereas it's a minor modification
2167          */
2168         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2169                 wfProfileIn( __METHOD__ );
2170
2171                 $serialized = $content->serialize( $serialisation_format );
2172
2173                 $dbw = wfGetDB( DB_MASTER );
2174                 $revision = new Revision( array(
2175                         'title'      => $this->getTitle(), // for determining the default content model
2176                         'page'       => $this->getId(),
2177                         'text'       => $serialized,
2178                         'length'     => $content->getSize(),
2179                         'comment'    => $comment,
2180                         'minor_edit' => $minor ? 1 : 0,
2181                 ) ); #XXX: set the content object?
2182                 $revision->insertOn( $dbw );
2183                 $this->updateRevisionOn( $dbw, $revision );
2184
2185                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2186
2187                 wfProfileOut( __METHOD__ );
2188         }
2189
2190         /**
2191          * Update the article's restriction field, and leave a log entry.
2192          * This works for protection both existing and non-existing pages.
2193          *
2194          * @param $limit Array: set of restriction keys
2195          * @param $reason String
2196          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2197          * @param $expiry Array: per restriction type expiration
2198          * @param $user User The user updating the restrictions
2199          * @return Status
2200          */
2201         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2202                 global $wgContLang;
2203
2204                 if ( wfReadOnly() ) {
2205                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2206                 }
2207
2208                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2209
2210                 $id = $this->mTitle->getArticleID();
2211
2212                 if ( !$cascade ) {
2213                         $cascade = false;
2214                 }
2215
2216                 // Take this opportunity to purge out expired restrictions
2217                 Title::purgeExpiredRestrictions();
2218
2219                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2220                 # we expect a single selection, but the schema allows otherwise.
2221                 $isProtected = false;
2222                 $protect = false;
2223                 $changed = false;
2224
2225                 $dbw = wfGetDB( DB_MASTER );
2226
2227                 foreach ( $restrictionTypes as $action ) {
2228                         if ( !isset( $expiry[$action] ) ) {
2229                                 $expiry[$action] = $dbw->getInfinity();
2230                         }
2231                         if ( !isset( $limit[$action] ) ) {
2232                                 $limit[$action] = '';
2233                         } elseif ( $limit[$action] != '' ) {
2234                                 $protect = true;
2235                         }
2236
2237                         # Get current restrictions on $action
2238                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2239                         if ( $current != '' ) {
2240                                 $isProtected = true;
2241                         }
2242
2243                         if ( $limit[$action] != $current ) {
2244                                 $changed = true;
2245                         } elseif ( $limit[$action] != '' ) {
2246                                 # Only check expiry change if the action is actually being
2247                                 # protected, since expiry does nothing on an not-protected
2248                                 # action.
2249                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2250                                         $changed = true;
2251                                 }
2252                         }
2253                 }
2254
2255                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2256                         $changed = true;
2257                 }
2258
2259                 # If nothing's changed, do nothing
2260                 if ( !$changed ) {
2261                         return Status::newGood();
2262                 }
2263
2264                 if ( !$protect ) { # No protection at all means unprotection
2265                         $revCommentMsg = 'unprotectedarticle';
2266                         $logAction = 'unprotect';
2267                 } elseif ( $isProtected ) {
2268                         $revCommentMsg = 'modifiedarticleprotection';
2269                         $logAction = 'modify';
2270                 } else {
2271                         $revCommentMsg = 'protectedarticle';
2272                         $logAction = 'protect';
2273                 }
2274
2275                 $encodedExpiry = array();
2276                 $protectDescription = '';
2277                 foreach ( $limit as $action => $restrictions ) {
2278                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2279                         if ( $restrictions != '' ) {
2280                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2281                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2282                                         $protectDescription .= wfMessage(
2283                                                 'protect-expiring',
2284                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2285                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2286                                                 $wgContLang->time( $expiry[$action], false, false )
2287                                         )->inContentLanguage()->text();
2288                                 } else {
2289                                         $protectDescription .= wfMessage( 'protect-expiry-indefinite' )
2290                                                 ->inContentLanguage()->text();
2291                                 }
2292
2293                                 $protectDescription .= ') ';
2294                         }
2295                 }
2296                 $protectDescription = trim( $protectDescription );
2297
2298                 if ( $id ) { # Protection of existing page
2299                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2300                                 return Status::newGood();
2301                         }
2302
2303                         # Only restrictions with the 'protect' right can cascade...
2304                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2305                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2306
2307                         # The schema allows multiple restrictions
2308                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2309                                 $cascade = false;
2310                         }
2311
2312                         # Update restrictions table
2313                         foreach ( $limit as $action => $restrictions ) {
2314                                 if ( $restrictions != '' ) {
2315                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2316                                                 array( 'pr_page' => $id,
2317                                                         'pr_type' => $action,
2318                                                         'pr_level' => $restrictions,
2319                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2320                                                         'pr_expiry' => $encodedExpiry[$action]
2321                                                 ),
2322                                                 __METHOD__
2323                                         );
2324                                 } else {
2325                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2326                                                 'pr_type' => $action ), __METHOD__ );
2327                                 }
2328                         }
2329
2330                         # Prepare a null revision to be added to the history
2331                         $editComment = $wgContLang->ucfirst(
2332                                 wfMessage(
2333                                         $revCommentMsg,
2334                                         $this->mTitle->getPrefixedText()
2335                                 )->inContentLanguage()->text()
2336                         );
2337                         if ( $reason ) {
2338                                 $editComment .= ": $reason";
2339                         }
2340                         if ( $protectDescription ) {
2341                                 $editComment .= " ($protectDescription)";
2342                         }
2343                         if ( $cascade ) {
2344                                 // FIXME: Should use 'brackets' message.
2345                                 $editComment .= ' [' . wfMessage( 'protect-summary-cascade' )
2346                                         ->inContentLanguage()->text() . ']';
2347                         }
2348
2349                         # Insert a null revision
2350                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2351                         $nullRevId = $nullRevision->insertOn( $dbw );
2352
2353                         $latest = $this->getLatest();
2354                         # Update page record
2355                         $dbw->update( 'page',
2356                                 array( /* SET */
2357                                         'page_touched' => $dbw->timestamp(),
2358                                         'page_restrictions' => '',
2359                                         'page_latest' => $nullRevId
2360                                 ), array( /* WHERE */
2361                                         'page_id' => $id
2362                                 ), __METHOD__
2363                         );
2364
2365                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2366                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2367                 } else { # Protection of non-existing page (also known as "title protection")
2368                         # Cascade protection is meaningless in this case
2369                         $cascade = false;
2370
2371                         if ( $limit['create'] != '' ) {
2372                                 $dbw->replace( 'protected_titles',
2373                                         array( array( 'pt_namespace', 'pt_title' ) ),
2374                                         array(
2375                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2376                                                 'pt_title' => $this->mTitle->getDBkey(),
2377                                                 'pt_create_perm' => $limit['create'],
2378                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2379                                                 'pt_expiry' => $encodedExpiry['create'],
2380                                                 'pt_user' => $user->getId(),
2381                                                 'pt_reason' => $reason,
2382                                         ), __METHOD__
2383                                 );
2384                         } else {
2385                                 $dbw->delete( 'protected_titles',
2386                                         array(
2387                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2388                                                 'pt_title' => $this->mTitle->getDBkey()
2389                                         ), __METHOD__
2390                                 );
2391                         }
2392                 }
2393
2394                 $this->mTitle->flushRestrictions();
2395
2396                 if ( $logAction == 'unprotect' ) {
2397                         $logParams = array();
2398                 } else {
2399                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2400                 }
2401
2402                 # Update the protection log
2403                 $log = new LogPage( 'protect' );
2404                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2405
2406                 return Status::newGood();
2407         }
2408
2409         /**
2410          * Take an array of page restrictions and flatten it to a string
2411          * suitable for insertion into the page_restrictions field.
2412          * @param $limit Array
2413          * @throws MWException
2414          * @return String
2415          */
2416         protected static function flattenRestrictions( $limit ) {
2417                 if ( !is_array( $limit ) ) {
2418                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2419                 }
2420
2421                 $bits = array();
2422                 ksort( $limit );
2423
2424                 foreach ( $limit as $action => $restrictions ) {
2425                         if ( $restrictions != '' ) {
2426                                 $bits[] = "$action=$restrictions";
2427                         }
2428                 }
2429
2430                 return implode( ':', $bits );
2431         }
2432
2433         /**
2434          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2435          * backwards compatibility, if you care about error reporting you should use
2436          * doDeleteArticleReal() instead.
2437          *
2438          * Deletes the article with database consistency, writes logs, purges caches
2439          *
2440          * @param $reason string delete reason for deletion log
2441          * @param $suppress boolean suppress all revisions and log the deletion in
2442          *        the suppression log instead of the deletion log
2443          * @param $id int article ID
2444          * @param $commit boolean defaults to true, triggers transaction end
2445          * @param &$error Array of errors to append to
2446          * @param $user User The deleting user
2447          * @return boolean true if successful
2448          */
2449         public function doDeleteArticle(
2450                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2451         ) {
2452                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2453                 return $status->isGood();
2454         }
2455
2456         /**
2457          * Back-end article deletion
2458          * Deletes the article with database consistency, writes logs, purges caches
2459          *
2460          * @since 1.19
2461          *
2462          * @param $reason string delete reason for deletion log
2463          * @param $suppress boolean suppress all revisions and log the deletion in
2464          *        the suppression log instead of the deletion log
2465          * @param $id int article ID
2466          * @param $commit boolean defaults to true, triggers transaction end
2467          * @param &$error Array of errors to append to
2468          * @param $user User The deleting user
2469          * @return Status: Status object; if successful, $status->value is the log_id of the
2470          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2471          *                 found, $status is a non-fatal 'cannotdelete' error
2472          */
2473         public function doDeleteArticleReal(
2474                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2475         ) {
2476                 global $wgUser, $wgContentHandlerUseDB;
2477
2478                 wfDebug( __METHOD__ . "\n" );
2479
2480                 $status = Status::newGood();
2481
2482                 if ( $this->mTitle->getDBkey() === '' ) {
2483                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2484                         return $status;
2485                 }
2486
2487                 $user = is_null( $user ) ? $wgUser : $user;
2488                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2489                         if ( $status->isOK() ) {
2490                                 // Hook aborted but didn't set a fatal status
2491                                 $status->fatal( 'delete-hook-aborted' );
2492                         }
2493                         return $status;
2494                 }
2495
2496                 if ( $id == 0 ) {
2497                         $this->loadPageData( 'forupdate' );
2498                         $id = $this->getID();
2499                         if ( $id == 0 ) {
2500                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2501                                 return $status;
2502                         }
2503                 }
2504
2505                 // Bitfields to further suppress the content
2506                 if ( $suppress ) {
2507                         $bitfield = 0;
2508                         // This should be 15...
2509                         $bitfield |= Revision::DELETED_TEXT;
2510                         $bitfield |= Revision::DELETED_COMMENT;
2511                         $bitfield |= Revision::DELETED_USER;
2512                         $bitfield |= Revision::DELETED_RESTRICTED;
2513                 } else {
2514                         $bitfield = 'rev_deleted';
2515                 }
2516
2517                 // we need to remember the old content so we can use it to generate all deletion updates.
2518                 $content = $this->getContent( Revision::RAW );
2519
2520                 $dbw = wfGetDB( DB_MASTER );
2521                 $dbw->begin( __METHOD__ );
2522                 // For now, shunt the revision data into the archive table.
2523                 // Text is *not* removed from the text table; bulk storage
2524                 // is left intact to avoid breaking block-compression or
2525                 // immutable storage schemes.
2526                 //
2527                 // For backwards compatibility, note that some older archive
2528                 // table entries will have ar_text and ar_flags fields still.
2529                 //
2530                 // In the future, we may keep revisions and mark them with
2531                 // the rev_deleted field, which is reserved for this purpose.
2532
2533                 $row = array(
2534                         'ar_namespace'  => 'page_namespace',
2535                         'ar_title'      => 'page_title',
2536                         'ar_comment'    => 'rev_comment',
2537                         'ar_user'       => 'rev_user',
2538                         'ar_user_text'  => 'rev_user_text',
2539                         'ar_timestamp'  => 'rev_timestamp',
2540                         'ar_minor_edit' => 'rev_minor_edit',
2541                         'ar_rev_id'     => 'rev_id',
2542                         'ar_parent_id'  => 'rev_parent_id',
2543                         'ar_text_id'    => 'rev_text_id',
2544                         'ar_text'       => '\'\'', // Be explicit to appease
2545                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2546                         'ar_len'        => 'rev_len',
2547                         'ar_page_id'    => 'page_id',
2548                         'ar_deleted'    => $bitfield,
2549                         'ar_sha1'       => 'rev_sha1',
2550                 );
2551
2552                 if ( $wgContentHandlerUseDB ) {
2553                         $row[ 'ar_content_model' ] = 'rev_content_model';
2554                         $row[ 'ar_content_format' ] = 'rev_content_format';
2555                 }
2556
2557                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2558                         $row,
2559                         array(
2560                                 'page_id' => $id,
2561                                 'page_id = rev_page'
2562                         ), __METHOD__
2563                 );
2564
2565                 # Now that it's safely backed up, delete it
2566                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2567                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2568
2569                 if ( !$ok ) {
2570                         $dbw->rollback( __METHOD__ );
2571                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2572                         return $status;
2573                 }
2574
2575                 $this->doDeleteUpdates( $id, $content );
2576
2577                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2578                 $logtype = $suppress ? 'suppress' : 'delete';
2579
2580                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2581                 $logEntry->setPerformer( $user );
2582                 $logEntry->setTarget( $this->mTitle );
2583                 $logEntry->setComment( $reason );
2584                 $logid = $logEntry->insert();
2585                 $logEntry->publish( $logid );
2586
2587                 if ( $commit ) {
2588                         $dbw->commit( __METHOD__ );
2589                 }
2590
2591                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2592                 $status->value = $logid;
2593                 return $status;
2594         }
2595
2596         /**
2597          * Do some database updates after deletion
2598          *
2599          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2600          * @param $content Content: optional page content to be used when determining the required updates.
2601          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2602          */
2603         public function doDeleteUpdates( $id, Content $content = null ) {
2604                 # update site status
2605                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2606
2607                 # remove secondary indexes, etc
2608                 $updates = $this->getDeletionUpdates( $content );
2609                 DataUpdate::runUpdates( $updates );
2610
2611                 # Clear caches
2612                 WikiPage::onArticleDelete( $this->mTitle );
2613
2614                 # Reset this object
2615                 $this->clear();
2616
2617                 # Clear the cached article id so the interface doesn't act like we exist
2618                 $this->mTitle->resetArticleID( 0 );
2619         }
2620
2621         /**
2622          * Roll back the most recent consecutive set of edits to a page
2623          * from the same user; fails if there are no eligible edits to
2624          * roll back to, e.g. user is the sole contributor. This function
2625          * performs permissions checks on $user, then calls commitRollback()
2626          * to do the dirty work
2627          *
2628          * @todo: seperate the business/permission stuff out from backend code
2629          *
2630          * @param $fromP String: Name of the user whose edits to rollback.
2631          * @param $summary String: Custom summary. Set to default summary if empty.
2632          * @param $token String: Rollback token.
2633          * @param $bot Boolean: If true, mark all reverted edits as bot.
2634          *
2635          * @param $resultDetails Array: contains result-specific array of additional values
2636          *    'alreadyrolled' : 'current' (rev)
2637          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2638          *
2639          * @param $user User The user performing the rollback
2640          * @return array of errors, each error formatted as
2641          *   array(messagekey, param1, param2, ...).
2642          * On success, the array is empty.  This array can also be passed to
2643          * OutputPage::showPermissionsErrorPage().
2644          */
2645         public function doRollback(
2646                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2647         ) {
2648                 $resultDetails = null;
2649
2650                 # Check permissions
2651                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2652                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2653                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2654
2655                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2656                         $errors[] = array( 'sessionfailure' );
2657                 }
2658
2659                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2660                         $errors[] = array( 'actionthrottledtext' );
2661                 }
2662
2663                 # If there were errors, bail out now
2664                 if ( !empty( $errors ) ) {
2665                         return $errors;
2666                 }
2667
2668                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2669         }
2670
2671         /**
2672          * Backend implementation of doRollback(), please refer there for parameter
2673          * and return value documentation
2674          *
2675          * NOTE: This function does NOT check ANY permissions, it just commits the
2676          * rollback to the DB. Therefore, you should only call this function direct-
2677          * ly if you want to use custom permissions checks. If you don't, use
2678          * doRollback() instead.
2679          * @param $fromP String: Name of the user whose edits to rollback.
2680          * @param $summary String: Custom summary. Set to default summary if empty.
2681          * @param $bot Boolean: If true, mark all reverted edits as bot.
2682          *
2683          * @param $resultDetails Array: contains result-specific array of additional values
2684          * @param $guser User The user performing the rollback
2685          * @return array
2686          */
2687         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2688                 global $wgUseRCPatrol, $wgContLang;
2689
2690                 $dbw = wfGetDB( DB_MASTER );
2691
2692                 if ( wfReadOnly() ) {
2693                         return array( array( 'readonlytext' ) );
2694                 }
2695
2696                 # Get the last editor
2697                 $current = $this->getRevision();
2698                 if ( is_null( $current ) ) {
2699                         # Something wrong... no page?
2700                         return array( array( 'notanarticle' ) );
2701                 }
2702
2703                 $from = str_replace( '_', ' ', $fromP );
2704                 # User name given should match up with the top revision.
2705                 # If the user was deleted then $from should be empty.
2706                 if ( $from != $current->getUserText() ) {
2707                         $resultDetails = array( 'current' => $current );
2708                         return array( array( 'alreadyrolled',
2709                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2710                                 htmlspecialchars( $fromP ),
2711                                 htmlspecialchars( $current->getUserText() )
2712                         ) );
2713                 }
2714
2715                 # Get the last edit not by this guy...
2716                 # Note: these may not be public values
2717                 $user = intval( $current->getRawUser() );
2718                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2719                 $s = $dbw->selectRow( 'revision',
2720                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2721                         array( 'rev_page' => $current->getPage(),
2722                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2723                         ), __METHOD__,
2724                         array( 'USE INDEX' => 'page_timestamp',
2725                                 'ORDER BY' => 'rev_timestamp DESC' )
2726                         );
2727                 if ( $s === false ) {
2728                         # No one else ever edited this page
2729                         return array( array( 'cantrollback' ) );
2730                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2731                         # Only admins can see this text
2732                         return array( array( 'notvisiblerev' ) );
2733                 }
2734
2735                 $set = array();
2736                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2737                         # Mark all reverted edits as bot
2738                         $set['rc_bot'] = 1;
2739                 }
2740
2741                 if ( $wgUseRCPatrol ) {
2742                         # Mark all reverted edits as patrolled
2743                         $set['rc_patrolled'] = 1;
2744                 }
2745
2746                 if ( count( $set ) ) {
2747                         $dbw->update( 'recentchanges', $set,
2748                                 array( /* WHERE */
2749                                         'rc_cur_id' => $current->getPage(),
2750                                         'rc_user_text' => $current->getUserText(),
2751                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2752                                 ), __METHOD__
2753                         );
2754                 }
2755
2756                 # Generate the edit summary if necessary
2757                 $target = Revision::newFromId( $s->rev_id );
2758                 if ( empty( $summary ) ) {
2759                         if ( $from == '' ) { // no public user name
2760                                 $summary = wfMessage( 'revertpage-nouser' );
2761                         } else {
2762                                 $summary = wfMessage( 'revertpage' );
2763                         }
2764                 }
2765
2766                 # Allow the custom summary to use the same args as the default message
2767                 $args = array(
2768                         $target->getUserText(), $from, $s->rev_id,
2769                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2770                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2771                 );
2772                 if( $summary instanceof Message ) {
2773                         $summary = $summary->params( $args )->inContentLanguage()->text();
2774                 } else {
2775                         $summary = wfMsgReplaceArgs( $summary, $args );
2776                 }
2777
2778                 # Truncate for whole multibyte characters.
2779                 $summary = $wgContLang->truncate( $summary, 255 );
2780
2781                 # Save
2782                 $flags = EDIT_UPDATE;
2783
2784                 if ( $guser->isAllowed( 'minoredit' ) ) {
2785                         $flags |= EDIT_MINOR;
2786                 }
2787
2788                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2789                         $flags |= EDIT_FORCE_BOT;
2790                 }
2791
2792                 # Actually store the edit
2793                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2794
2795                 if ( !$status->isOK() ) {
2796                         return $status->getErrorsArray();
2797                 }
2798
2799                 if ( !empty( $status->value['revision'] ) ) {
2800                         $revId = $status->value['revision']->getId();
2801                 } else {
2802                         $revId = false;
2803                 }
2804
2805                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2806
2807                 $resultDetails = array(
2808                         'summary' => $summary,
2809                         'current' => $current,
2810                         'target'  => $target,
2811                         'newid'   => $revId
2812                 );
2813
2814                 return array();
2815         }
2816
2817         /**
2818          * The onArticle*() functions are supposed to be a kind of hooks
2819          * which should be called whenever any of the specified actions
2820          * are done.
2821          *
2822          * This is a good place to put code to clear caches, for instance.
2823          *
2824          * This is called on page move and undelete, as well as edit
2825          *
2826          * @param $title Title object
2827          */
2828         public static function onArticleCreate( $title ) {
2829                 # Update existence markers on article/talk tabs...
2830                 if ( $title->isTalkPage() ) {
2831                         $other = $title->getSubjectPage();
2832                 } else {
2833                         $other = $title->getTalkPage();
2834                 }
2835
2836                 $other->invalidateCache();
2837                 $other->purgeSquid();
2838
2839                 $title->touchLinks();
2840                 $title->purgeSquid();
2841                 $title->deleteTitleProtection();
2842         }
2843
2844         /**
2845          * Clears caches when article is deleted
2846          *
2847          * @param $title Title
2848          */
2849         public static function onArticleDelete( $title ) {
2850                 # Update existence markers on article/talk tabs...
2851                 if ( $title->isTalkPage() ) {
2852                         $other = $title->getSubjectPage();
2853                 } else {
2854                         $other = $title->getTalkPage();
2855                 }
2856
2857                 $other->invalidateCache();
2858                 $other->purgeSquid();
2859
2860                 $title->touchLinks();
2861                 $title->purgeSquid();
2862
2863                 # File cache
2864                 HTMLFileCache::clearFileCache( $title );
2865
2866                 # Messages
2867                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2868                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2869                 }
2870
2871                 # Images
2872                 if ( $title->getNamespace() == NS_FILE ) {
2873                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2874                         $update->doUpdate();
2875                 }
2876
2877                 # User talk pages
2878                 if ( $title->getNamespace() == NS_USER_TALK ) {
2879                         $user = User::newFromName( $title->getText(), false );
2880                         if ( $user ) {
2881                                 $user->setNewtalk( false );
2882                         }
2883                 }
2884
2885                 # Image redirects
2886                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2887         }
2888
2889         /**
2890          * Purge caches on page update etc
2891          *
2892          * @param $title Title object
2893          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2894          */
2895         public static function onArticleEdit( $title ) {
2896                 // Invalidate caches of articles which include this page
2897                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2898
2899
2900                 // Invalidate the caches of all pages which redirect here
2901                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2902
2903                 # Purge squid for this page only
2904                 $title->purgeSquid();
2905
2906                 # Clear file cache for this page only
2907                 HTMLFileCache::clearFileCache( $title );
2908         }
2909
2910         /**#@-*/
2911
2912         /**
2913          * Returns a list of hidden categories this page is a member of.
2914          * Uses the page_props and categorylinks tables.
2915          *
2916          * @return Array of Title objects
2917          */
2918         public function getHiddenCategories() {
2919                 $result = array();
2920                 $id = $this->mTitle->getArticleID();
2921
2922                 if ( $id == 0 ) {
2923                         return array();
2924                 }
2925
2926                 $dbr = wfGetDB( DB_SLAVE );
2927                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2928                         array( 'cl_to' ),
2929                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2930                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2931                         __METHOD__ );
2932
2933                 if ( $res !== false ) {
2934                         foreach ( $res as $row ) {
2935                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2936                         }
2937                 }
2938
2939                 return $result;
2940         }
2941
2942         /**
2943         * Return an applicable autosummary if one exists for the given edit.
2944         * @param $oldtext String|null: the previous text of the page.
2945         * @param $newtext String|null: The submitted text of the page.
2946         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2947         * @return string An appropriate autosummary, or an empty string.
2948         *
2949         * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2950         */
2951         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2952                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2953
2954                 ContentHandler::deprecated( __METHOD__, '1.21' );
2955
2956                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2957                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2958                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2959
2960                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2961         }
2962
2963         /**
2964          * Auto-generates a deletion reason
2965          *
2966          * @param &$hasHistory Boolean: whether the page has a history
2967          * @return mixed String containing deletion reason or empty string, or boolean false
2968          *    if no revision occurred
2969          */
2970         public function getAutoDeleteReason( &$hasHistory ) {
2971                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2972         }
2973
2974         /**
2975          * Update all the appropriate counts in the category table, given that
2976          * we've added the categories $added and deleted the categories $deleted.
2977          *
2978          * @param $added array   The names of categories that were added
2979          * @param $deleted array The names of categories that were deleted
2980          */
2981         public function updateCategoryCounts( $added, $deleted ) {
2982                 $ns = $this->mTitle->getNamespace();
2983                 $dbw = wfGetDB( DB_MASTER );
2984
2985                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2986                 # exist, we might legitimately not create it, but it's simpler to just
2987                 # create it and then give it a negative value, since the value is bogus
2988                 # anyway.
2989                 #
2990                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2991                 $insertCats = array_merge( $added, $deleted );
2992                 if ( !$insertCats ) {
2993                         # Okay, nothing to do
2994                         return;
2995                 }
2996
2997                 $insertRows = array();
2998
2999                 foreach ( $insertCats as $cat ) {
3000                         $insertRows[] = array(
3001                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
3002                                 'cat_title' => $cat
3003                         );
3004                 }
3005                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3006
3007                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3008                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3009
3010                 if ( $ns == NS_CATEGORY ) {
3011                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3012                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3013                 } elseif ( $ns == NS_FILE ) {
3014                         $addFields[]    = 'cat_files = cat_files + 1';
3015                         $removeFields[] = 'cat_files = cat_files - 1';
3016                 }
3017
3018                 if ( $added ) {
3019                         $dbw->update(
3020                                 'category',
3021                                 $addFields,
3022                                 array( 'cat_title' => $added ),
3023                                 __METHOD__
3024                         );
3025                 }
3026
3027                 if ( $deleted ) {
3028                         $dbw->update(
3029                                 'category',
3030                                 $removeFields,
3031                                 array( 'cat_title' => $deleted ),
3032                                 __METHOD__
3033                         );
3034                 }
3035         }
3036
3037         /**
3038          * Updates cascading protections
3039          *
3040          * @param $parserOutput ParserOutput object for the current version
3041          */
3042         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3043                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3044                         return;
3045                 }
3046
3047                 // templatelinks table may have become out of sync,
3048                 // especially if using variable-based transclusions.
3049                 // For paranoia, check if things have changed and if
3050                 // so apply updates to the database. This will ensure
3051                 // that cascaded protections apply as soon as the changes
3052                 // are visible.
3053
3054                 # Get templates from templatelinks
3055                 $id = $this->mTitle->getArticleID();
3056
3057                 $tlTemplates = array();
3058
3059                 $dbr = wfGetDB( DB_SLAVE );
3060                 $res = $dbr->select( array( 'templatelinks' ),
3061                         array( 'tl_namespace', 'tl_title' ),
3062                         array( 'tl_from' => $id ),
3063                         __METHOD__
3064                 );
3065
3066                 foreach ( $res as $row ) {
3067                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3068                 }
3069
3070                 # Get templates from parser output.
3071                 $poTemplates = array();
3072                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3073                         foreach ( $templates as $dbk => $id ) {
3074                                 $poTemplates["$ns:$dbk"] = true;
3075                         }
3076                 }
3077
3078                 # Get the diff
3079                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3080
3081                 if ( count( $templates_diff ) > 0 ) {
3082                         # Whee, link updates time.
3083                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3084                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3085                         $u->doUpdate();
3086                 }
3087         }
3088
3089         /**
3090          * Return a list of templates used by this article.
3091          * Uses the templatelinks table
3092          *
3093          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3094          * @return Array of Title objects
3095          */
3096         public function getUsedTemplates() {
3097                 return $this->mTitle->getTemplateLinksFrom();
3098         }
3099
3100         /**
3101          * Perform article updates on a special page creation.
3102          *
3103          * @param $rev Revision object
3104          *
3105          * @todo This is a shitty interface function. Kill it and replace the
3106          * other shitty functions like doEditUpdates and such so it's not needed
3107          * anymore.
3108          * @deprecated since 1.18, use doEditUpdates()
3109          */
3110         public function createUpdates( $rev ) {
3111                 wfDeprecated( __METHOD__, '1.18' );
3112                 global $wgUser;
3113                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3114         }
3115
3116         /**
3117          * This function is called right before saving the wikitext,
3118          * so we can do things like signatures and links-in-context.
3119          *
3120          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3121          * @param $text String article contents
3122          * @param $user User object: user doing the edit
3123          * @param $popts ParserOptions object: parser options, default options for
3124          *               the user loaded if null given
3125          * @return string article contents with altered wikitext markup (signatures
3126          *      converted, {{subst:}}, templates, etc.)
3127          */
3128         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3129                 global $wgParser, $wgUser;
3130
3131                 wfDeprecated( __METHOD__, '1.19' );
3132
3133                 $user = is_null( $user ) ? $wgUser : $user;
3134
3135                 if ( $popts === null ) {
3136                         $popts = ParserOptions::newFromUser( $user );
3137                 }
3138
3139                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3140         }
3141
3142         /**
3143          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3144          *
3145          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3146          * @return bool
3147          */
3148         public function isBigDeletion() {
3149                 wfDeprecated( __METHOD__, '1.19' );
3150                 return $this->mTitle->isBigDeletion();
3151         }
3152
3153         /**
3154          * Get the  approximate revision count of this page.
3155          *
3156          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3157          * @return int
3158          */
3159         public function estimateRevisionCount() {
3160                 wfDeprecated( __METHOD__, '1.19' );
3161                 return $this->mTitle->estimateRevisionCount();
3162         }
3163
3164         /**
3165          * Update the article's restriction field, and leave a log entry.
3166          *
3167          * @deprecated since 1.19
3168          * @param $limit Array: set of restriction keys
3169          * @param $reason String
3170          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3171          * @param $expiry Array: per restriction type expiration
3172          * @param $user User The user updating the restrictions
3173          * @return bool true on success
3174          */
3175         public function updateRestrictions(
3176                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3177         ) {
3178                 global $wgUser;
3179
3180                 $user = is_null( $user ) ? $wgUser : $user;
3181
3182                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3183         }
3184
3185         /**
3186          * @deprecated since 1.18
3187          */
3188         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3189                 wfDeprecated( __METHOD__, '1.18' );
3190                 global $wgUser;
3191                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3192         }
3193
3194         /**
3195          * @deprecated since 1.18
3196          */
3197         public function viewUpdates() {
3198                 wfDeprecated( __METHOD__, '1.18' );
3199                 global $wgUser;
3200                 return $this->doViewUpdates( $wgUser );
3201         }
3202
3203         /**
3204          * @deprecated since 1.18
3205          * @param $oldid int
3206          * @return bool
3207          */
3208         public function useParserCache( $oldid ) {
3209                 wfDeprecated( __METHOD__, '1.18' );
3210                 global $wgUser;
3211                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3212         }
3213
3214         /**
3215          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3216          * about this page from secondary data stores such as links tables.
3217          *
3218          * @param Content|null $content optional Content object for determining the necessary updates
3219          * @return Array an array of DataUpdates objects
3220          */
3221         public function getDeletionUpdates( Content $content = null ) {
3222                 if ( !$content ) {
3223                         // load content object, which may be used to determine the necessary updates
3224                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3225                         $content = $this->getContent( Revision::RAW );
3226                 }
3227
3228                 if ( !$content ) {
3229                         $updates = array();
3230                 } else {
3231                         $updates = $content->getDeletionUpdates( $this );
3232                 }
3233
3234                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3235                 return $updates;
3236         }
3237
3238 }
3239
3240 class PoolWorkArticleView extends PoolCounterWork {
3241
3242         /**
3243          * @var Page
3244          */
3245         private $page;
3246
3247         /**
3248          * @var string
3249          */
3250         private $cacheKey;
3251
3252         /**
3253          * @var integer
3254          */
3255         private $revid;
3256
3257         /**
3258          * @var ParserOptions
3259          */
3260         private $parserOptions;
3261
3262         /**
3263          * @var Content|null
3264          */
3265         private $content = null;
3266
3267         /**
3268          * @var ParserOutput|bool
3269          */
3270         private $parserOutput = false;
3271
3272         /**
3273          * @var bool
3274          */
3275         private $isDirty = false;
3276
3277         /**
3278          * @var Status|bool
3279          */
3280         private $error = false;
3281
3282         /**
3283          * Constructor
3284          *
3285          * @param $page Page
3286          * @param $revid Integer: ID of the revision being parsed
3287          * @param $useParserCache Boolean: whether to use the parser cache
3288          * @param $parserOptions parserOptions to use for the parse operation
3289          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3290          */
3291         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3292                 if ( is_string($content) ) { #BC: old style call
3293                         $modelId = $page->getRevision()->getContentModel();
3294                         $format = $page->getRevision()->getContentFormat();
3295                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3296                 }
3297
3298                 $this->page = $page;
3299                 $this->revid = $revid;
3300                 $this->cacheable = $useParserCache;
3301                 $this->parserOptions = $parserOptions;
3302                 $this->content = $content;
3303                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3304                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3305         }
3306
3307         /**
3308          * Get the ParserOutput from this object, or false in case of failure
3309          *
3310          * @return ParserOutput
3311          */
3312         public function getParserOutput() {
3313                 return $this->parserOutput;
3314         }
3315
3316         /**
3317          * Get whether the ParserOutput is a dirty one (i.e. expired)
3318          *
3319          * @return bool
3320          */
3321         public function getIsDirty() {
3322                 return $this->isDirty;
3323         }
3324
3325         /**
3326          * Get a Status object in case of error or false otherwise
3327          *
3328          * @return Status|bool
3329          */
3330         public function getError() {
3331                 return $this->error;
3332         }
3333
3334         /**
3335          * @return bool
3336          */
3337         function doWork() {
3338                 global $wgUseFileCache;
3339
3340                 // @todo: several of the methods called on $this->page are not declared in Page, but present
3341                 //        in WikiPage and delegated by Article.
3342
3343                 $isCurrent = $this->revid === $this->page->getLatest();
3344
3345                 if ( $this->content !== null ) {
3346                         $content = $this->content;
3347                 } elseif ( $isCurrent ) {
3348                         #XXX: why use RAW audience here, and PUBLIC (default) below?
3349                         $content = $this->page->getContent( Revision::RAW );
3350                 } else {
3351                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3352
3353                         if ( $rev === null ) {
3354                                 $content = null;
3355                         } else {
3356                                 #XXX: why use PUBLIC audience here (default), and RAW above?
3357                                 $content = $rev->getContent();
3358                         }
3359                 }
3360
3361                 if ( $content === null ) {
3362                         return false;
3363                 }
3364
3365                 $time = - microtime( true );
3366                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3367                 $time += microtime( true );
3368
3369                 # Timing hack
3370                 if ( $time > 3 ) {
3371                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3372                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3373                 }
3374
3375                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3376                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3377                 }
3378
3379                 // Make sure file cache is not used on uncacheable content.
3380                 // Output that has magic words in it can still use the parser cache
3381                 // (if enabled), though it will generally expire sooner.
3382                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3383                         $wgUseFileCache = false;
3384                 }
3385
3386                 if ( $isCurrent ) {
3387                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3388                 }
3389
3390                 return true;
3391         }
3392
3393         /**
3394          * @return bool
3395          */
3396         function getCachedWork() {
3397                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3398
3399                 if ( $this->parserOutput === false ) {
3400                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3401                         return false;
3402                 } else {
3403                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3404                         return true;
3405                 }
3406         }
3407
3408         /**
3409          * @return bool
3410          */
3411         function fallback() {
3412                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3413
3414                 if ( $this->parserOutput === false ) {
3415                         wfDebugLog( 'dirty', "dirty missing\n" );
3416                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3417                         return false;
3418                 } else {
3419                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3420                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3421                         $this->isDirty = true;
3422                         return true;
3423                 }
3424         }
3425
3426         /**
3427          * @param $status Status
3428          * @return bool
3429          */
3430         function error( $status ) {
3431                 $this->error = $status;
3432                 return false;
3433         }
3434 }
3435