includes/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
  25  */
  26 interface Page {}
  27
  28 /**
  29  * 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 implements Page, 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
  55          */
  56         protected $mId = null;
  57
  58         /**
  59          * @var int; one of the READ_* constants
  60          */
  61         protected $mDataLoadedFrom = self::READ_NONE;
  62
  63         /**
  64          * @var Title
  65          */
  66         protected $mRedirectTarget = null;
  67
  68         /**
  69          * @var Revision
  70          */
  71         protected $mLastRevision = null;
  72
  73         /**
  74          * @var string; timestamp of the current revision or empty string if not loaded
  75          */
  76         protected $mTimestamp = '';
  77
  78         /**
  79          * @var string
  80          */
  81         protected $mTouched = '19700101000000';
  82
  83         /**
  84          * @var int|null
  85          */
  86         protected $mCounter = null;
  87
  88         /**
  89          * Constructor and clear the article
  90          * @param $title Title Reference to a Title object.
  91          */
  92         public function __construct( Title $title ) {
  93                 $this->mTitle = $title;
  94         }
  95
  96         /**
  97          * Create a WikiPage object of the appropriate class for the given title.
  98          *
  99          * @param $title Title
 100          * @throws MWException
 101          * @return WikiPage object of the appropriate type
 102          */
 103         public static function factory( Title $title ) {
 104                 $ns = $title->getNamespace();
 105
 106                 if ( $ns == NS_MEDIA ) {
 107                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 108                 } elseif ( $ns < 0 ) {
 109                         throw new MWException( "Invalid or virtual namespace $ns given." );
 110                 }
 111
 112                 switch ( $ns ) {
 113                         case NS_FILE:
 114                                 $page = new WikiFilePage( $title );
 115                                 break;
 116                         case NS_CATEGORY:
 117                                 $page = new WikiCategoryPage( $title );
 118                                 break;
 119                         default:
 120                                 $page = new WikiPage( $title );
 121                 }
 122
 123                 return $page;
 124         }
 125
 126         /**
 127          * Constructor from a page id
 128          *
 129          * @param int $id article ID to load
 130          * @param string|int $from one of the following values:
 131          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 132          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 133          *
 134          * @return WikiPage|null
 135          */
 136         public static function newFromID( $id, $from = 'fromdb' ) {
 137                 $from = self::convertSelectType( $from );
 138                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 139                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 140                 if ( !$row ) {
 141                         return null;
 142                 }
 143                 return self::newFromRow( $row, $from );
 144         }
 145
 146         /**
 147          * Constructor from a database row
 148          *
 149          * @since 1.20
 150          * @param $row object: database row containing at least fields returned
 151          *        by selectFields().
 152          * @param string|int $from source of $data:
 153          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 154          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 155          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 156          * @return WikiPage
 157          */
 158         public static function newFromRow( $row, $from = 'fromdb' ) {
 159                 $page = self::factory( Title::newFromRow( $row ) );
 160                 $page->loadFromRow( $row, $from );
 161                 return $page;
 162         }
 163
 164         /**
 165          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 166          *
 167          * @param $type object|string|int
 168          * @return mixed
 169          */
 170         private static function convertSelectType( $type ) {
 171                 switch ( $type ) {
 172                 case 'fromdb':
 173                         return self::READ_NORMAL;
 174                 case 'fromdbmaster':
 175                         return self::READ_LATEST;
 176                 case 'forupdate':
 177                         return self::READ_LOCKING;
 178                 default:
 179                         // It may already be an integer or whatever else
 180                         return $type;
 181                 }
 182         }
 183
 184         /**
 185          * Returns overrides for action handlers.
 186          * Classes listed here will be used instead of the default one when
 187          * (and only when) $wgActions[$action] === true. This allows subclasses
 188          * to override the default behavior.
 189          *
 190          * @todo Move this UI stuff somewhere else
 191          *
 192          * @return Array
 193          */
 194         public function getActionOverrides() {
 195                 $content_handler = $this->getContentHandler();
 196                 return $content_handler->getActionOverrides();
 197         }
 198
 199         /**
 200          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 201          *
 202          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 203          *
 204          * @return ContentHandler
 205          *
 206          * @since 1.21
 207          */
 208         public function getContentHandler() {
 209                 return ContentHandler::getForModelID( $this->getContentModel() );
 210         }
 211
 212         /**
 213          * Get the title object of the article
 214          * @return Title object of this page
 215          */
 216         public function getTitle() {
 217                 return $this->mTitle;
 218         }
 219
 220         /**
 221          * Clear the object
 222          * @return void
 223          */
 224         public function clear() {
 225                 $this->mDataLoaded = false;
 226                 $this->mDataLoadedFrom = self::READ_NONE;
 227
 228                 $this->clearCacheFields();
 229         }
 230
 231         /**
 232          * Clear the object cache fields
 233          * @return void
 234          */
 235         protected function clearCacheFields() {
 236                 $this->mId = null;
 237                 $this->mCounter = null;
 238                 $this->mRedirectTarget = null; // Title object if set
 239                 $this->mLastRevision = null; // Latest revision
 240                 $this->mTouched = '19700101000000';
 241                 $this->mTimestamp = '';
 242                 $this->mIsRedirect = false;
 243                 $this->mLatest = false;
 244                 $this->mPreparedEdit = false;
 245         }
 246
 247         /**
 248          * Return the list of revision fields that should be selected to create
 249          * a new page.
 250          *
 251          * @return array
 252          */
 253         public static function selectFields() {
 254                 global $wgContentHandlerUseDB;
 255
 256                 $fields = array(
 257                         'page_id',
 258                         'page_namespace',
 259                         'page_title',
 260                         'page_restrictions',
 261                         'page_counter',
 262                         'page_is_redirect',
 263                         'page_is_new',
 264                         'page_random',
 265                         'page_touched',
 266                         'page_latest',
 267                         'page_len',
 268                 );
 269
 270                 if ( $wgContentHandlerUseDB ) {
 271                         $fields[] = 'page_content_model';
 272                 }
 273
 274                 return $fields;
 275         }
 276
 277         /**
 278          * Fetch a page record with the given conditions
 279          * @param $dbr DatabaseBase object
 280          * @param $conditions Array
 281          * @param $options Array
 282          * @return mixed Database result resource, or false on failure
 283          */
 284         protected function pageData( $dbr, $conditions, $options = array() ) {
 285                 $fields = self::selectFields();
 286
 287                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 288
 289                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 290
 291                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 292
 293                 return $row;
 294         }
 295
 296         /**
 297          * Fetch a page record matching the Title object's namespace and title
 298          * using a sanitized title string
 299          *
 300          * @param $dbr DatabaseBase object
 301          * @param $title Title object
 302          * @param $options Array
 303          * @return mixed Database result resource, or false on failure
 304          */
 305         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 306                 return $this->pageData( $dbr, array(
 307                         'page_namespace' => $title->getNamespace(),
 308                         'page_title' => $title->getDBkey() ), $options );
 309         }
 310
 311         /**
 312          * Fetch a page record matching the requested ID
 313          *
 314          * @param $dbr DatabaseBase
 315          * @param $id Integer
 316          * @param $options Array
 317          * @return mixed Database result resource, or false on failure
 318          */
 319         public function pageDataFromId( $dbr, $id, $options = array() ) {
 320                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 321         }
 322
 323         /**
 324          * Set the general counter, title etc data loaded from
 325          * some source.
 326          *
 327          * @param $from object|string|int One of the following:
 328          *        - A DB query result object
 329          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 330          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 331          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 332          *
 333          * @return void
 334          */
 335         public function loadPageData( $from = 'fromdb' ) {
 336                 $from = self::convertSelectType( $from );
 337                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 338                         // We already have the data from the correct location, no need to load it twice.
 339                         return;
 340                 }
 341
 342                 if ( $from === self::READ_LOCKING ) {
 343                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 344                 } elseif ( $from === self::READ_LATEST ) {
 345                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 346                 } elseif ( $from === self::READ_NORMAL ) {
 347                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 348                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 349                         // Note that DB also stores the master position in the session and checks it.
 350                         $touched = $this->getCachedLastEditTime();
 351                         if ( $touched ) { // key set
 352                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 353                                         $from = self::READ_LATEST;
 354                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 355                                 }
 356                         }
 357                 } else {
 358                         // No idea from where the caller got this data, assume slave database.
 359                         $data = $from;
 360                         $from = self::READ_NORMAL;
 361                 }
 362
 363                 $this->loadFromRow( $data, $from );
 364         }
 365
 366         /**
 367          * Load the object from a database row
 368          *
 369          * @since 1.20
 370          * @param $data object: database row containing at least fields returned
 371          *        by selectFields()
 372          * @param string|int $from One of the following:
 373          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 374          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 375          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 376          *          the master DB using SELECT FOR UPDATE
 377          */
 378         public function loadFromRow( $data, $from ) {
 379                 $lc = LinkCache::singleton();
 380                 $lc->clearLink( $this->mTitle );
 381
 382                 if ( $data ) {
 383                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 384
 385                         $this->mTitle->loadFromRow( $data );
 386
 387                         // Old-fashioned restrictions
 388                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 389
 390                         $this->mId = intval( $data->page_id );
 391                         $this->mCounter = intval( $data->page_counter );
 392                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 393                         $this->mIsRedirect = intval( $data->page_is_redirect );
 394                         $this->mLatest = intval( $data->page_latest );
 395                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 396                         // Double-check the ID of any cached latest Revision object for consistency.
 397                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 398                                 $this->mLastRevision = null;
 399                                 $this->mTimestamp = '';
 400                         }
 401                 } else {
 402                         $lc->addBadLinkObj( $this->mTitle );
 403
 404                         $this->mTitle->loadFromRow( false );
 405
 406                         $this->clearCacheFields();
 407
 408                         $this->mId = 0;
 409                 }
 410
 411                 $this->mDataLoaded = true;
 412                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 413         }
 414
 415         /**
 416          * @return int Page ID
 417          */
 418         public function getId() {
 419                 if ( !$this->mDataLoaded ) {
 420                         $this->loadPageData();
 421                 }
 422                 return $this->mId;
 423         }
 424
 425         /**
 426          * @return bool Whether or not the page exists in the database
 427          */
 428         public function exists() {
 429                 if ( !$this->mDataLoaded ) {
 430                         $this->loadPageData();
 431                 }
 432                 return $this->mId > 0;
 433         }
 434
 435         /**
 436          * Check if this page is something we're going to be showing
 437          * some sort of sensible content for. If we return false, page
 438          * views (plain action=view) will return an HTTP 404 response,
 439          * so spiders and robots can know they're following a bad link.
 440          *
 441          * @return bool
 442          */
 443         public function hasViewableContent() {
 444                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 445         }
 446
 447         /**
 448          * @return int The view count for the page
 449          */
 450         public function getCount() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454
 455                 return $this->mCounter;
 456         }
 457
 458         /**
 459          * Tests if the article content represents a redirect
 460          *
 461          * @return bool
 462          */
 463         public function isRedirect() {
 464                 $content = $this->getContent();
 465                 if ( !$content ) {
 466                         return false;
 467                 }
 468
 469                 return $content->isRedirect();
 470         }
 471
 472         /**
 473          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 474          *
 475          * Will use the revisions actual content model if the page exists,
 476          * and the page's default if the page doesn't exist yet.
 477          *
 478          * @return String
 479          *
 480          * @since 1.21
 481          */
 482         public function getContentModel() {
 483                 if ( $this->exists() ) {
 484                         // look at the revision's actual content model
 485                         $rev = $this->getRevision();
 486
 487                         if ( $rev !== null ) {
 488                                 return $rev->getContentModel();
 489                         } else {
 490                                 $title = $this->mTitle->getPrefixedDBkey();
 491                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 492                         }
 493                 }
 494
 495                 // use the default model for this page
 496                 return $this->mTitle->getContentModel();
 497         }
 498
 499         /**
 500          * Loads page_touched and returns a value indicating if it should be used
 501          * @return boolean true if not a redirect
 502          */
 503         public function checkTouched() {
 504                 if ( !$this->mDataLoaded ) {
 505                         $this->loadPageData();
 506                 }
 507                 return !$this->mIsRedirect;
 508         }
 509
 510         /**
 511          * Get the page_touched field
 512          * @return string containing GMT timestamp
 513          */
 514         public function getTouched() {
 515                 if ( !$this->mDataLoaded ) {
 516                         $this->loadPageData();
 517                 }
 518                 return $this->mTouched;
 519         }
 520
 521         /**
 522          * Get the page_latest field
 523          * @return integer rev_id of current revision
 524          */
 525         public function getLatest() {
 526                 if ( !$this->mDataLoaded ) {
 527                         $this->loadPageData();
 528                 }
 529                 return (int)$this->mLatest;
 530         }
 531
 532         /**
 533          * Get the Revision object of the oldest revision
 534          * @return Revision|null
 535          */
 536         public function getOldestRevision() {
 537                 wfProfileIn( __METHOD__ );
 538
 539                 // Try using the slave database first, then try the master
 540                 $continue = 2;
 541                 $db = wfGetDB( DB_SLAVE );
 542                 $revSelectFields = Revision::selectFields();
 543
 544                 $row = null;
 545                 while ( $continue ) {
 546                         $row = $db->selectRow(
 547                                 array( 'page', 'revision' ),
 548                                 $revSelectFields,
 549                                 array(
 550                                         'page_namespace' => $this->mTitle->getNamespace(),
 551                                         'page_title' => $this->mTitle->getDBkey(),
 552                                         'rev_page = page_id'
 553                                 ),
 554                                 __METHOD__,
 555                                 array(
 556                                         'ORDER BY' => 'rev_timestamp ASC'
 557                                 )
 558                         );
 559
 560                         if ( $row ) {
 561                                 $continue = 0;
 562                         } else {
 563                                 $db = wfGetDB( DB_MASTER );
 564                                 $continue--;
 565                         }
 566                 }
 567
 568                 wfProfileOut( __METHOD__ );
 569                 return $row ? Revision::newFromRow( $row ) : null;
 570         }
 571
 572         /**
 573          * Loads everything except the text
 574          * This isn't necessary for all uses, so it's only done if needed.
 575          */
 576         protected function loadLastEdit() {
 577                 if ( $this->mLastRevision !== null ) {
 578                         return; // already loaded
 579                 }
 580
 581                 $latest = $this->getLatest();
 582                 if ( !$latest ) {
 583                         return; // page doesn't exist or is missing page_latest info
 584                 }
 585
 586                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 587                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 588                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 589                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 590                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 591                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 592                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 593                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 594                 if ( $revision ) { // sanity
 595                         $this->setLastEdit( $revision );
 596                 }
 597         }
 598
 599         /**
 600          * Set the latest revision
 601          */
 602         protected function setLastEdit( Revision $revision ) {
 603                 $this->mLastRevision = $revision;
 604                 $this->mTimestamp = $revision->getTimestamp();
 605         }
 606
 607         /**
 608          * Get the latest revision
 609          * @return Revision|null
 610          */
 611         public function getRevision() {
 612                 $this->loadLastEdit();
 613                 if ( $this->mLastRevision ) {
 614                         return $this->mLastRevision;
 615                 }
 616                 return null;
 617         }
 618
 619         /**
 620          * Get the content of the current revision. No side-effects...
 621          *
 622          * @param $audience Integer: one of:
 623          *      Revision::FOR_PUBLIC       to be displayed to all users
 624          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 625          *      Revision::RAW              get the text regardless of permissions
 626          * @param $user User object to check for, only if FOR_THIS_USER is passed
 627          *              to the $audience parameter
 628          * @return Content|null The content of the current revision
 629          *
 630          * @since 1.21
 631          */
 632         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 633                 $this->loadLastEdit();
 634                 if ( $this->mLastRevision ) {
 635                         return $this->mLastRevision->getContent( $audience, $user );
 636                 }
 637                 return null;
 638         }
 639
 640         /**
 641          * Get the text of the current revision. No side-effects...
 642          *
 643          * @param $audience Integer: one of:
 644          *      Revision::FOR_PUBLIC       to be displayed to all users
 645          *      Revision::FOR_THIS_USER    to be displayed to the given user
 646          *      Revision::RAW              get the text regardless of permissions
 647          * @param $user User object to check for, only if FOR_THIS_USER is passed
 648          *              to the $audience parameter
 649          * @return String|false The text of the current revision
 650          * @deprecated as of 1.21, getContent() should be used instead.
 651          */
 652         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo deprecated, replace usage!
 653                 ContentHandler::deprecated( __METHOD__, '1.21' );
 654
 655                 $this->loadLastEdit();
 656                 if ( $this->mLastRevision ) {
 657                         return $this->mLastRevision->getText( $audience, $user );
 658                 }
 659                 return false;
 660         }
 661
 662         /**
 663          * Get the text of the current revision. No side-effects...
 664          *
 665          * @return String|bool The text of the current revision. False on failure
 666          * @deprecated as of 1.21, getContent() should be used instead.
 667          */
 668         public function getRawText() {
 669                 ContentHandler::deprecated( __METHOD__, '1.21' );
 670
 671                 return $this->getText( Revision::RAW );
 672         }
 673
 674         /**
 675          * @return string MW timestamp of last article revision
 676          */
 677         public function getTimestamp() {
 678                 // Check if the field has been filled by WikiPage::setTimestamp()
 679                 if ( !$this->mTimestamp ) {
 680                         $this->loadLastEdit();
 681                 }
 682
 683                 return wfTimestamp( TS_MW, $this->mTimestamp );
 684         }
 685
 686         /**
 687          * Set the page timestamp (use only to avoid DB queries)
 688          * @param string $ts MW timestamp of last article revision
 689          * @return void
 690          */
 691         public function setTimestamp( $ts ) {
 692                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 693         }
 694
 695         /**
 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 int user ID for the user that made the last article revision
 703          */
 704         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 705                 $this->loadLastEdit();
 706                 if ( $this->mLastRevision ) {
 707                         return $this->mLastRevision->getUser( $audience, $user );
 708                 } else {
 709                         return -1;
 710                 }
 711         }
 712
 713         /**
 714          * Get the User object of the user who created the page
 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 User|null
 722          */
 723         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 724                 $revision = $this->getOldestRevision();
 725                 if ( $revision ) {
 726                         $userName = $revision->getUserText( $audience, $user );
 727                         return User::newFromName( $userName, false );
 728                 } else {
 729                         return null;
 730                 }
 731         }
 732
 733         /**
 734          * @param $audience Integer: one of:
 735          *      Revision::FOR_PUBLIC       to be displayed to all users
 736          *      Revision::FOR_THIS_USER    to be displayed to the given user
 737          *      Revision::RAW              get the text regardless of permissions
 738          * @param $user User object to check for, only if FOR_THIS_USER is passed
 739          *              to the $audience parameter
 740          * @return string username of the user that made the last article revision
 741          */
 742         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 743                 $this->loadLastEdit();
 744                 if ( $this->mLastRevision ) {
 745                         return $this->mLastRevision->getUserText( $audience, $user );
 746                 } else {
 747                         return '';
 748                 }
 749         }
 750
 751         /**
 752          * @param $audience Integer: one of:
 753          *      Revision::FOR_PUBLIC       to be displayed to all users
 754          *      Revision::FOR_THIS_USER    to be displayed to the given user
 755          *      Revision::RAW              get the text regardless of permissions
 756          * @param $user User object to check for, only if FOR_THIS_USER is passed
 757          *              to the $audience parameter
 758          * @return string Comment stored for the last article revision
 759          */
 760         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 761                 $this->loadLastEdit();
 762                 if ( $this->mLastRevision ) {
 763                         return $this->mLastRevision->getComment( $audience, $user );
 764                 } else {
 765                         return '';
 766                 }
 767         }
 768
 769         /**
 770          * Returns true if last revision was marked as "minor edit"
 771          *
 772          * @return boolean Minor edit indicator for the last article revision.
 773          */
 774         public function getMinorEdit() {
 775                 $this->loadLastEdit();
 776                 if ( $this->mLastRevision ) {
 777                         return $this->mLastRevision->isMinor();
 778                 } else {
 779                         return false;
 780                 }
 781         }
 782
 783         /**
 784          * Get the cached timestamp for the last time the page changed.
 785          * This is only used to help handle slave lag by comparing to page_touched.
 786          * @return string MW timestamp
 787          */
 788         protected function getCachedLastEditTime() {
 789                 global $wgMemc;
 790                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 791                 return $wgMemc->get( $key );
 792         }
 793
 794         /**
 795          * Set the cached timestamp for the last time the page changed.
 796          * This is only used to help handle slave lag by comparing to page_touched.
 797          * @param $timestamp string
 798          * @return void
 799          */
 800         public function setCachedLastEditTime( $timestamp ) {
 801                 global $wgMemc;
 802                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 803                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 804         }
 805
 806         /**
 807          * Determine whether a page would be suitable for being counted as an
 808          * article in the site_stats table based on the title & its content
 809          *
 810          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 811          *        if false, the current database state will be used
 812          * @return Boolean
 813          */
 814         public function isCountable( $editInfo = false ) {
 815                 global $wgArticleCountMethod;
 816
 817                 if ( !$this->mTitle->isContentPage() ) {
 818                         return false;
 819                 }
 820
 821                 if ( $editInfo ) {
 822                         $content = $editInfo->pstContent;
 823                 } else {
 824                         $content = $this->getContent();
 825                 }
 826
 827                 if ( !$content || $content->isRedirect() ) {
 828                         return false;
 829                 }
 830
 831                 $hasLinks = null;
 832
 833                 if ( $wgArticleCountMethod === 'link' ) {
 834                         // nasty special case to avoid re-parsing to detect links
 835
 836                         if ( $editInfo ) {
 837                                 // ParserOutput::getLinks() is a 2D array of page links, so
 838                                 // to be really correct we would need to recurse in the array
 839                                 // but the main array should only have items in it if there are
 840                                 // links.
 841                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 842                         } else {
 843                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 844                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 845                         }
 846                 }
 847
 848                 return $content->isCountable( $hasLinks );
 849         }
 850
 851         /**
 852          * If this page is a redirect, get its target
 853          *
 854          * The target will be fetched from the redirect table if possible.
 855          * If this page doesn't have an entry there, call insertRedirect()
 856          * @return Title|mixed object, or null if this page is not a redirect
 857          */
 858         public function getRedirectTarget() {
 859                 if ( !$this->mTitle->isRedirect() ) {
 860                         return null;
 861                 }
 862
 863                 if ( $this->mRedirectTarget !== null ) {
 864                         return $this->mRedirectTarget;
 865                 }
 866
 867                 // Query the redirect table
 868                 $dbr = wfGetDB( DB_SLAVE );
 869                 $row = $dbr->selectRow( 'redirect',
 870                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 871                         array( 'rd_from' => $this->getId() ),
 872                         __METHOD__
 873                 );
 874
 875                 // rd_fragment and rd_interwiki were added later, populate them if empty
 876                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 877                         return $this->mRedirectTarget = Title::makeTitle(
 878                                 $row->rd_namespace, $row->rd_title,
 879                                 $row->rd_fragment, $row->rd_interwiki );
 880                 }
 881
 882                 // This page doesn't have an entry in the redirect table
 883                 return $this->mRedirectTarget = $this->insertRedirect();
 884         }
 885
 886         /**
 887          * Insert an entry for this page into the redirect table.
 888          *
 889          * Don't call this function directly unless you know what you're doing.
 890          * @return Title object or null if not a redirect
 891          */
 892         public function insertRedirect() {
 893                 // recurse through to only get the final target
 894                 $content = $this->getContent();
 895                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 896                 if ( !$retval ) {
 897                         return null;
 898                 }
 899                 $this->insertRedirectEntry( $retval );
 900                 return $retval;
 901         }
 902
 903         /**
 904          * Insert or update the redirect table entry for this page to indicate
 905          * it redirects to $rt .
 906          * @param $rt Title redirect target
 907          */
 908         public function insertRedirectEntry( $rt ) {
 909                 $dbw = wfGetDB( DB_MASTER );
 910                 $dbw->replace( 'redirect', array( 'rd_from' ),
 911                         array(
 912                                 'rd_from' => $this->getId(),
 913                                 'rd_namespace' => $rt->getNamespace(),
 914                                 'rd_title' => $rt->getDBkey(),
 915                                 'rd_fragment' => $rt->getFragment(),
 916                                 'rd_interwiki' => $rt->getInterwiki(),
 917                         ),
 918                         __METHOD__
 919                 );
 920         }
 921
 922         /**
 923          * Get the Title object or URL this page redirects to
 924          *
 925          * @return mixed false, Title of in-wiki target, or string with URL
 926          */
 927         public function followRedirect() {
 928                 return $this->getRedirectURL( $this->getRedirectTarget() );
 929         }
 930
 931         /**
 932          * Get the Title object or URL to use for a redirect. We use Title
 933          * objects for same-wiki, non-special redirects and URLs for everything
 934          * else.
 935          * @param $rt Title Redirect target
 936          * @return mixed false, Title object of local target, or string with URL
 937          */
 938         public function getRedirectURL( $rt ) {
 939                 if ( !$rt ) {
 940                         return false;
 941                 }
 942
 943                 if ( $rt->isExternal() ) {
 944                         if ( $rt->isLocal() ) {
 945                                 // Offsite wikis need an HTTP redirect.
 946                                 //
 947                                 // This can be hard to reverse and may produce loops,
 948                                 // so they may be disabled in the site configuration.
 949                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 950                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 951                         } else {
 952                                 // External pages pages without "local" bit set are not valid
 953                                 // redirect targets
 954                                 return false;
 955                         }
 956                 }
 957
 958                 if ( $rt->isSpecialPage() ) {
 959                         // Gotta handle redirects to special pages differently:
 960                         // Fill the HTTP response "Location" header and ignore
 961                         // the rest of the page we're on.
 962                         //
 963                         // Some pages are not valid targets
 964                         if ( $rt->isValidRedirectTarget() ) {
 965                                 return $rt->getFullURL();
 966                         } else {
 967                                 return false;
 968                         }
 969                 }
 970
 971                 return $rt;
 972         }
 973
 974         /**
 975          * Get a list of users who have edited this article, not including the user who made
 976          * the most recent revision, which you can get from $article->getUser() if you want it
 977          * @return UserArrayFromResult
 978          */
 979         public function getContributors() {
 980                 // @todo FIXME: This is expensive; cache this info somewhere.
 981
 982                 $dbr = wfGetDB( DB_SLAVE );
 983
 984                 if ( $dbr->implicitGroupby() ) {
 985                         $realNameField = 'user_real_name';
 986                 } else {
 987                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 988                 }
 989
 990                 $tables = array( 'revision', 'user' );
 991
 992                 $fields = array(
 993                         'user_id' => 'rev_user',
 994                         'user_name' => 'rev_user_text',
 995                         $realNameField,
 996                         'timestamp' => 'MAX(rev_timestamp)',
 997                 );
 998
 999                 $conds = array( 'rev_page' => $this->getId() );
1000
1001                 // The user who made the top revision gets credited as "this page was last edited by
1002                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1003                 $user = $this->getUser();
1004                 if ( $user ) {
1005                         $conds[] = "rev_user != $user";
1006                 } else {
1007                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1008                 }
1009
1010                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1011
1012                 $jconds = array(
1013                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1014                 );
1015
1016                 $options = array(
1017                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1018                         'ORDER BY' => 'timestamp DESC',
1019                 );
1020
1021                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1022                 return new UserArrayFromResult( $res );
1023         }
1024
1025         /**
1026          * Get the last N authors
1027          * @param int $num Number of revisions to get
1028          * @param int|string $revLatest the latest rev_id, selected from the master (optional)
1029          * @return array Array of authors, duplicates not removed
1030          */
1031         public function getLastNAuthors( $num, $revLatest = 0 ) {
1032                 wfProfileIn( __METHOD__ );
1033                 // First try the slave
1034                 // If that doesn't have the latest revision, try the master
1035                 $continue = 2;
1036                 $db = wfGetDB( DB_SLAVE );
1037
1038                 do {
1039                         $res = $db->select( array( 'page', 'revision' ),
1040                                 array( 'rev_id', 'rev_user_text' ),
1041                                 array(
1042                                         'page_namespace' => $this->mTitle->getNamespace(),
1043                                         'page_title' => $this->mTitle->getDBkey(),
1044                                         'rev_page = page_id'
1045                                 ), __METHOD__,
1046                                 array(
1047                                         'ORDER BY' => 'rev_timestamp DESC',
1048                                         'LIMIT' => $num
1049                                 )
1050                         );
1051
1052                         if ( !$res ) {
1053                                 wfProfileOut( __METHOD__ );
1054                                 return array();
1055                         }
1056
1057                         $row = $db->fetchObject( $res );
1058
1059                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1060                                 $db = wfGetDB( DB_MASTER );
1061                                 $continue--;
1062                         } else {
1063                                 $continue = 0;
1064                         }
1065                 } while ( $continue );
1066
1067                 $authors = array( $row->rev_user_text );
1068
1069                 foreach ( $res as $row ) {
1070                         $authors[] = $row->rev_user_text;
1071                 }
1072
1073                 wfProfileOut( __METHOD__ );
1074                 return $authors;
1075         }
1076
1077         /**
1078          * Should the parser cache be used?
1079          *
1080          * @param $parserOptions ParserOptions to check
1081          * @param $oldid int
1082          * @return boolean
1083          */
1084         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1085                 global $wgEnableParserCache;
1086
1087                 return $wgEnableParserCache
1088                         && $parserOptions->getStubThreshold() == 0
1089                         && $this->exists()
1090                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1091                         && $this->getContentHandler()->isParserCacheSupported();
1092         }
1093
1094         /**
1095          * Get a ParserOutput for the given ParserOptions and revision ID.
1096          * The parser cache will be used if possible.
1097          *
1098          * @since 1.19
1099          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1100          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1101          *               get the current revision (default value)
1102          *
1103          * @return ParserOutput or false if the revision was not found
1104          */
1105         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1106                 wfProfileIn( __METHOD__ );
1107
1108                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1109                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1110                 if ( $parserOptions->getStubThreshold() ) {
1111                         wfIncrStats( 'pcache_miss_stub' );
1112                 }
1113
1114                 if ( $useParserCache ) {
1115                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1116                         if ( $parserOutput !== false ) {
1117                                 wfProfileOut( __METHOD__ );
1118                                 return $parserOutput;
1119                         }
1120                 }
1121
1122                 if ( $oldid === null || $oldid === 0 ) {
1123                         $oldid = $this->getLatest();
1124                 }
1125
1126                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1127                 $pool->execute();
1128
1129                 wfProfileOut( __METHOD__ );
1130
1131                 return $pool->getParserOutput();
1132         }
1133
1134         /**
1135          * Do standard deferred updates after page view
1136          * @param $user User The relevant user
1137          */
1138         public function doViewUpdates( User $user ) {
1139                 global $wgDisableCounters;
1140                 if ( wfReadOnly() ) {
1141                         return;
1142                 }
1143
1144                 // Don't update page view counters on views from bot users (bug 14044)
1145                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1146                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1147                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1148                 }
1149
1150                 // Update newtalk / watchlist notification status
1151                 $user->clearNotification( $this->mTitle );
1152         }
1153
1154         /**
1155          * Perform the actions of a page purging
1156          * @return bool
1157          */
1158         public function doPurge() {
1159                 global $wgUseSquid;
1160
1161                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1162                         return false;
1163                 }
1164
1165                 // Invalidate the cache
1166                 $this->mTitle->invalidateCache();
1167
1168                 if ( $wgUseSquid ) {
1169                         // Commit the transaction before the purge is sent
1170                         $dbw = wfGetDB( DB_MASTER );
1171                         $dbw->commit( __METHOD__ );
1172
1173                         // Send purge
1174                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1175                         $update->doUpdate();
1176                 }
1177
1178                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1179                         // @todo move this logic to MessageCache
1180
1181                         if ( $this->exists() ) {
1182                                 // NOTE: use transclusion text for messages.
1183                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1184
1185                                 $content = $this->getContent();
1186                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1187
1188                                 if ( $text === null ) {
1189                                         $text = false;
1190                                 }
1191                         } else {
1192                                 $text = false;
1193                         }
1194
1195                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1196                 }
1197                 return true;
1198         }
1199
1200         /**
1201          * Insert a new empty page record for this article.
1202          * This *must* be followed up by creating a revision
1203          * and running $this->updateRevisionOn( ... );
1204          * or else the record will be left in a funky state.
1205          * Best if all done inside a transaction.
1206          *
1207          * @param $dbw DatabaseBase
1208          * @return int The newly created page_id key, or false if the title already existed
1209          */
1210         public function insertOn( $dbw ) {
1211                 wfProfileIn( __METHOD__ );
1212
1213                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1214                 $dbw->insert( 'page', array(
1215                         'page_id'           => $page_id,
1216                         'page_namespace'    => $this->mTitle->getNamespace(),
1217                         'page_title'        => $this->mTitle->getDBkey(),
1218                         'page_counter'      => 0,
1219                         'page_restrictions' => '',
1220                         'page_is_redirect'  => 0, // Will set this shortly...
1221                         'page_is_new'       => 1,
1222                         'page_random'       => wfRandom(),
1223                         'page_touched'      => $dbw->timestamp(),
1224                         'page_latest'       => 0, // Fill this in shortly...
1225                         'page_len'          => 0, // Fill this in shortly...
1226                 ), __METHOD__, 'IGNORE' );
1227
1228                 $affected = $dbw->affectedRows();
1229
1230                 if ( $affected ) {
1231                         $newid = $dbw->insertId();
1232                         $this->mId = $newid;
1233                         $this->mTitle->resetArticleID( $newid );
1234                 }
1235                 wfProfileOut( __METHOD__ );
1236
1237                 return $affected ? $newid : false;
1238         }
1239
1240         /**
1241          * Update the page record to point to a newly saved revision.
1242          *
1243          * @param $dbw DatabaseBase: object
1244          * @param $revision Revision: For ID number, and text used to set
1245          *                  length and redirect status fields
1246          * @param $lastRevision Integer: if given, will not overwrite the page field
1247          *                      when different from the currently set value.
1248          *                      Giving 0 indicates the new page flag should be set
1249          *                      on.
1250          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1251          *                           removing rows in redirect table.
1252          * @return bool true on success, false on failure
1253          * @private
1254          */
1255         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1256                 global $wgContentHandlerUseDB;
1257
1258                 wfProfileIn( __METHOD__ );
1259
1260                 $content = $revision->getContent();
1261                 $len = $content ? $content->getSize() : 0;
1262                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1263
1264                 $conditions = array( 'page_id' => $this->getId() );
1265
1266                 if ( !is_null( $lastRevision ) ) {
1267                         // An extra check against threads stepping on each other
1268                         $conditions['page_latest'] = $lastRevision;
1269                 }
1270
1271                 $now = wfTimestampNow();
1272                 $row = array( /* SET */
1273                         'page_latest'      => $revision->getId(),
1274                         'page_touched'     => $dbw->timestamp( $now ),
1275                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1276                         'page_is_redirect' => $rt !== null ? 1 : 0,
1277                         'page_len'         => $len,
1278                 );
1279
1280                 if ( $wgContentHandlerUseDB ) {
1281                         $row['page_content_model'] = $revision->getContentModel();
1282                 }
1283
1284                 $dbw->update( 'page',
1285                         $row,
1286                         $conditions,
1287                         __METHOD__ );
1288
1289                 $result = $dbw->affectedRows() > 0;
1290                 if ( $result ) {
1291                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1292                         $this->setLastEdit( $revision );
1293                         $this->setCachedLastEditTime( $now );
1294                         $this->mLatest = $revision->getId();
1295                         $this->mIsRedirect = (bool)$rt;
1296                         // Update the LinkCache.
1297                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1298                                                                                                         $this->mLatest, $revision->getContentModel() );
1299                 }
1300
1301                 wfProfileOut( __METHOD__ );
1302                 return $result;
1303         }
1304
1305         /**
1306          * Add row to the redirect table if this is a redirect, remove otherwise.
1307          *
1308          * @param $dbw DatabaseBase
1309          * @param $redirectTitle Title object pointing to the redirect target,
1310          *                       or NULL if this is not a redirect
1311          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1312          *                           removing rows in redirect table.
1313          * @return bool true on success, false on failure
1314          * @private
1315          */
1316         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1317                 // Always update redirects (target link might have changed)
1318                 // Update/Insert if we don't know if the last revision was a redirect or not
1319                 // Delete if changing from redirect to non-redirect
1320                 $isRedirect = !is_null( $redirectTitle );
1321
1322                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1323                         return true;
1324                 }
1325
1326                 wfProfileIn( __METHOD__ );
1327                 if ( $isRedirect ) {
1328                         $this->insertRedirectEntry( $redirectTitle );
1329                 } else {
1330                         // This is not a redirect, remove row from redirect table
1331                         $where = array( 'rd_from' => $this->getId() );
1332                         $dbw->delete( 'redirect', $where, __METHOD__ );
1333                 }
1334
1335                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1336                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1337                 }
1338                 wfProfileOut( __METHOD__ );
1339
1340                 return ( $dbw->affectedRows() != 0 );
1341         }
1342
1343         /**
1344          * If the given revision is newer than the currently set page_latest,
1345          * update the page record. Otherwise, do nothing.
1346          *
1347          * @param $dbw DatabaseBase object
1348          * @param $revision Revision object
1349          * @return mixed
1350          */
1351         public function updateIfNewerOn( $dbw, $revision ) {
1352                 wfProfileIn( __METHOD__ );
1353
1354                 $row = $dbw->selectRow(
1355                         array( 'revision', 'page' ),
1356                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1357                         array(
1358                                 'page_id' => $this->getId(),
1359                                 'page_latest=rev_id' ),
1360                         __METHOD__ );
1361
1362                 if ( $row ) {
1363                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1364                                 wfProfileOut( __METHOD__ );
1365                                 return false;
1366                         }
1367                         $prev = $row->rev_id;
1368                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1369                 } else {
1370                         // No or missing previous revision; mark the page as new
1371                         $prev = 0;
1372                         $lastRevIsRedirect = null;
1373                 }
1374
1375                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1376
1377                 wfProfileOut( __METHOD__ );
1378                 return $ret;
1379         }
1380
1381         /**
1382          * Get the content that needs to be saved in order to undo all revisions
1383          * between $undo and $undoafter. Revisions must belong to the same page,
1384          * must exist and must not be deleted
1385          * @param $undo Revision
1386          * @param $undoafter Revision Must be an earlier revision than $undo
1387          * @return mixed string on success, false on failure
1388          * @since 1.21
1389          * Before we had the Content object, this was done in getUndoText
1390          */
1391         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1392                 $handler = $undo->getContentHandler();
1393                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1394         }
1395
1396         /**
1397          * Get the text that needs to be saved in order to undo all revisions
1398          * between $undo and $undoafter. Revisions must belong to the same page,
1399          * must exist and must not be deleted
1400          * @param $undo Revision
1401          * @param $undoafter Revision Must be an earlier revision than $undo
1402          * @return mixed string on success, false on failure
1403          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1404          */
1405         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1406                 ContentHandler::deprecated( __METHOD__, '1.21' );
1407
1408                 $this->loadLastEdit();
1409
1410                 if ( $this->mLastRevision ) {
1411                         if ( is_null( $undoafter ) ) {
1412                                 $undoafter = $undo->getPrevious();
1413                         }
1414
1415                         $handler = $this->getContentHandler();
1416                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1417
1418                         if ( !$undone ) {
1419                                 return false;
1420                         } else {
1421                                 return ContentHandler::getContentText( $undone );
1422                         }
1423                 }
1424
1425                 return false;
1426         }
1427
1428         /**
1429          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1430          * @param string $text new text of the section
1431          * @param string $sectionTitle new section's subject, only if $section is 'new'
1432          * @param string $edittime revision timestamp or null to use the current revision
1433          * @throws MWException
1434          * @return String new complete article text, or null if error
1435          *
1436          * @deprecated since 1.21, use replaceSectionContent() instead
1437          */
1438         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1439                 ContentHandler::deprecated( __METHOD__, '1.21' );
1440
1441                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1442                         // Whole-page edit; let the whole text through
1443                         return $text;
1444                 }
1445
1446                 if ( !$this->supportsSections() ) {
1447                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1448                 }
1449
1450                 // could even make section title, but that's not required.
1451                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1452
1453                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1454
1455                 return ContentHandler::getContentText( $newContent );
1456         }
1457
1458         /**
1459          * Returns true iff this page's content model supports sections.
1460          *
1461          * @return boolean whether sections are supported.
1462          *
1463          * @todo The skin should check this and not offer section functionality if sections are not supported.
1464          * @todo The EditPage should check this and not offer section functionality if sections are not supported.
1465          */
1466         public function supportsSections() {
1467                 return $this->getContentHandler()->supportsSections();
1468         }
1469
1470         /**
1471          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1472          * @param $sectionContent Content: new content of the section
1473          * @param string $sectionTitle new section's subject, only if $section is 'new'
1474          * @param string $edittime revision timestamp or null to use the current revision
1475          *
1476          * @throws MWException
1477          * @return Content new complete article content, or null if error
1478          *
1479          * @since 1.21
1480          */
1481         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1482                 wfProfileIn( __METHOD__ );
1483
1484                 if ( strval( $section ) == '' ) {
1485                         // Whole-page edit; let the whole text through
1486                         $newContent = $sectionContent;
1487                 } else {
1488                         if ( !$this->supportsSections() ) {
1489                                 wfProfileOut( __METHOD__ );
1490                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1491                         }
1492
1493                         // Bug 30711: always use current version when adding a new section
1494                         if ( is_null( $edittime ) || $section == 'new' ) {
1495                                 $oldContent = $this->getContent();
1496                         } else {
1497                                 $dbw = wfGetDB( DB_MASTER );
1498                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1499
1500                                 if ( !$rev ) {
1501                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1502                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1503                                         wfProfileOut( __METHOD__ );
1504                                         return null;
1505                                 }
1506
1507                                 $oldContent = $rev->getContent();
1508                         }
1509
1510                         if ( ! $oldContent ) {
1511                                 wfDebug( __METHOD__ . ": no page text\n" );
1512                                 wfProfileOut( __METHOD__ );
1513                                 return null;
1514                         }
1515
1516                         // FIXME: $oldContent might be null?
1517                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1518                 }
1519
1520                 wfProfileOut( __METHOD__ );
1521                 return $newContent;
1522         }
1523
1524         /**
1525          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1526          * @param $flags Int
1527          * @return Int updated $flags
1528          */
1529         function checkFlags( $flags ) {
1530                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1531                         if ( $this->exists() ) {
1532                                 $flags |= EDIT_UPDATE;
1533                         } else {
1534                                 $flags |= EDIT_NEW;
1535                         }
1536                 }
1537
1538                 return $flags;
1539         }
1540
1541         /**
1542          * Change an existing article or create a new article. Updates RC and all necessary caches,
1543          * optionally via the deferred update array.
1544          *
1545          * @param string $text new text
1546          * @param string $summary edit summary
1547          * @param $flags Integer bitfield:
1548          *      EDIT_NEW
1549          *          Article is known or assumed to be non-existent, create a new one
1550          *      EDIT_UPDATE
1551          *          Article is known or assumed to be pre-existing, update it
1552          *      EDIT_MINOR
1553          *          Mark this edit minor, if the user is allowed to do so
1554          *      EDIT_SUPPRESS_RC
1555          *          Do not log the change in recentchanges
1556          *      EDIT_FORCE_BOT
1557          *          Mark the edit a "bot" edit regardless of user rights
1558          *      EDIT_DEFER_UPDATES
1559          *          Defer some of the updates until the end of index.php
1560          *      EDIT_AUTOSUMMARY
1561          *          Fill in blank summaries with generated text where possible
1562          *
1563          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1564          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1565          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1566          * edit-already-exists error will be returned. These two conditions are also possible with
1567          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1568          *
1569          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1570          * @param $user User the user doing the edit
1571          *
1572          * @throws MWException
1573          * @return Status object. Possible errors:
1574          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1575          *     edit-gone-missing:       In update mode, but the article didn't exist
1576          *     edit-conflict:           In update mode, the article changed unexpectedly
1577          *     edit-no-change:          Warning that the text was the same as before
1578          *     edit-already-exists:     In creation mode, but the article already exists
1579          *
1580          *  Extensions may define additional errors.
1581          *
1582          *  $return->value will contain an associative array with members as follows:
1583          *     new:                     Boolean indicating if the function attempted to create a new article
1584          *     revision:                The revision object for the inserted revision, or null
1585          *
1586          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1587          *
1588          * @deprecated since 1.21: use doEditContent() instead.
1589          */
1590         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1591                 ContentHandler::deprecated( __METHOD__, '1.21' );
1592
1593                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1594
1595                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1596         }
1597
1598         /**
1599          * Change an existing article or create a new article. Updates RC and all necessary caches,
1600          * optionally via the deferred update array.
1601          *
1602          * @param $content Content: new content
1603          * @param string $summary edit summary
1604          * @param $flags Integer bitfield:
1605          *      EDIT_NEW
1606          *          Article is known or assumed to be non-existent, create a new one
1607          *      EDIT_UPDATE
1608          *          Article is known or assumed to be pre-existing, update it
1609          *      EDIT_MINOR
1610          *          Mark this edit minor, if the user is allowed to do so
1611          *      EDIT_SUPPRESS_RC
1612          *          Do not log the change in recentchanges
1613          *      EDIT_FORCE_BOT
1614          *          Mark the edit a "bot" edit regardless of user rights
1615          *      EDIT_DEFER_UPDATES
1616          *          Defer some of the updates until the end of index.php
1617          *      EDIT_AUTOSUMMARY
1618          *          Fill in blank summaries with generated text where possible
1619          *
1620          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1621          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1622          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1623          * edit-already-exists error will be returned. These two conditions are also possible with
1624          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1625          *
1626          * @param bool|int $baseRevId the revision ID this edit was based off, if any
1627          * @param $user User the user doing the edit
1628          * @param $serialisation_format String: format for storing the content in the database
1629          *
1630          * @throws MWException
1631          * @return Status object. Possible errors:
1632          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1633          *     edit-gone-missing:       In update mode, but the article didn't exist
1634          *     edit-conflict:           In update mode, the article changed unexpectedly
1635          *     edit-no-change:          Warning that the text was the same as before
1636          *     edit-already-exists:     In creation mode, but the article already exists
1637          *
1638          *  Extensions may define additional errors.
1639          *
1640          *  $return->value will contain an associative array with members as follows:
1641          *     new:                     Boolean indicating if the function attempted to create a new article
1642          *     revision:                The revision object for the inserted revision, or null
1643          *
1644          * @since 1.21
1645          */
1646         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1647                                                                    User $user = null, $serialisation_format = null ) {
1648                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1649
1650                 // Low-level sanity check
1651                 if ( $this->mTitle->getText() === '' ) {
1652                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1653                 }
1654
1655                 wfProfileIn( __METHOD__ );
1656
1657                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1658                         wfProfileOut( __METHOD__ );
1659                         return Status::newFatal( 'content-not-allowed-here',
1660                                 ContentHandler::getLocalizedName( $content->getModel() ),
1661                                 $this->getTitle()->getPrefixedText() );
1662                 }
1663
1664                 $user = is_null( $user ) ? $wgUser : $user;
1665                 $status = Status::newGood( array() );
1666
1667                 // Load the data from the master database if needed.
1668                 // The caller may already loaded it from the master or even loaded it using
1669                 // SELECT FOR UPDATE, so do not override that using clear().
1670                 $this->loadPageData( 'fromdbmaster' );
1671
1672                 $flags = $this->checkFlags( $flags );
1673
1674                 // handle hook
1675                 $hook_args = array( &$this, &$user, &$content, &$summary,
1676                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1677
1678                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1679                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1680
1681                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1682
1683                         if ( $status->isOK() ) {
1684                                 $status->fatal( 'edit-hook-aborted' );
1685                         }
1686
1687                         wfProfileOut( __METHOD__ );
1688                         return $status;
1689                 }
1690
1691                 // Silently ignore EDIT_MINOR if not allowed
1692                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1693                 $bot = $flags & EDIT_FORCE_BOT;
1694
1695                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1696
1697                 $oldsize = $old_content ? $old_content->getSize() : 0;
1698                 $oldid = $this->getLatest();
1699                 $oldIsRedirect = $this->isRedirect();
1700                 $oldcountable = $this->isCountable();
1701
1702                 $handler = $content->getContentHandler();
1703
1704                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1705                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1706                         if ( !$old_content ) {
1707                                 $old_content = null;
1708                         }
1709                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1710                 }
1711
1712                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1713                 $serialized = $editInfo->pst;
1714
1715                 /**
1716                  * @var Content $content
1717                  */
1718                 $content = $editInfo->pstContent;
1719                 $newsize = $content->getSize();
1720
1721                 $dbw = wfGetDB( DB_MASTER );
1722                 $now = wfTimestampNow();
1723                 $this->mTimestamp = $now;
1724
1725                 if ( $flags & EDIT_UPDATE ) {
1726                         // Update article, but only if changed.
1727                         $status->value['new'] = false;
1728
1729                         if ( !$oldid ) {
1730                                 // Article gone missing
1731                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1732                                 $status->fatal( 'edit-gone-missing' );
1733
1734                                 wfProfileOut( __METHOD__ );
1735                                 return $status;
1736                         } elseif ( !$old_content ) {
1737                                 // Sanity check for bug 37225
1738                                 wfProfileOut( __METHOD__ );
1739                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1740                         }
1741
1742                         $revision = new Revision( array(
1743                                 'page'       => $this->getId(),
1744                                 'title'      => $this->getTitle(), // for determining the default content model
1745                                 'comment'    => $summary,
1746                                 'minor_edit' => $isminor,
1747                                 'text'       => $serialized,
1748                                 'len'        => $newsize,
1749                                 'parent_id'  => $oldid,
1750                                 'user'       => $user->getId(),
1751                                 'user_text'  => $user->getName(),
1752                                 'timestamp'  => $now,
1753                                 'content_model' => $content->getModel(),
1754                                 'content_format' => $serialisation_format,
1755                         ) ); // XXX: pass content object?!
1756
1757                         $changed = !$content->equals( $old_content );
1758
1759                         if ( $changed ) {
1760                                 if ( !$content->isValid() ) {
1761                                         wfProfileOut( __METHOD__ );
1762                                         throw new MWException( "New content failed validity check!" );
1763                                 }
1764
1765                                 $dbw->begin( __METHOD__ );
1766
1767                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1768                                 $status->merge( $prepStatus );
1769
1770                                 if ( !$status->isOK() ) {
1771                                         $dbw->rollback( __METHOD__ );
1772
1773                                         wfProfileOut( __METHOD__ );
1774                                         return $status;
1775                                 }
1776
1777                                 $revisionId = $revision->insertOn( $dbw );
1778
1779                                 // Update page
1780                                 //
1781                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1782                                 // during the course of this function. This makes sure that EditPage can detect
1783                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1784                                 // before this function is called. A previous function used a separate query, this
1785                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1786                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1787
1788                                 if ( !$ok ) {
1789                                         // Belated edit conflict! Run away!!
1790                                         $status->fatal( 'edit-conflict' );
1791
1792                                         $dbw->rollback( __METHOD__ );
1793
1794                                         wfProfileOut( __METHOD__ );
1795                                         return $status;
1796                                 }
1797
1798                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1799                                 // Update recentchanges
1800                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1801                                         // Mark as patrolled if the user can do so
1802                                         $patrolled = $wgUseRCPatrol && !count(
1803                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1804                                         // Add RC row to the DB
1805                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1806                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1807                                                 $revisionId, $patrolled
1808                                         );
1809
1810                                         // Log auto-patrolled edits
1811                                         if ( $patrolled ) {
1812                                                 PatrolLog::record( $rc, true, $user );
1813                                         }
1814                                 }
1815                                 $user->incEditCount();
1816                                 $dbw->commit( __METHOD__ );
1817                         } else {
1818                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1819                                 // related variables correctly
1820                                 $revision->setId( $this->getLatest() );
1821                         }
1822
1823                         // Update links tables, site stats, etc.
1824                         $this->doEditUpdates(
1825                                 $revision,
1826                                 $user,
1827                                 array(
1828                                         'changed' => $changed,
1829                                         'oldcountable' => $oldcountable
1830                                 )
1831                         );
1832
1833                         if ( !$changed ) {
1834                                 $status->warning( 'edit-no-change' );
1835                                 $revision = null;
1836                                 // Update page_touched, this is usually implicit in the page update
1837                                 // Other cache updates are done in onArticleEdit()
1838                                 $this->mTitle->invalidateCache();
1839                         }
1840                 } else {
1841                         // Create new article
1842                         $status->value['new'] = true;
1843
1844                         $dbw->begin( __METHOD__ );
1845
1846                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1847                         $status->merge( $prepStatus );
1848
1849                         if ( !$status->isOK() ) {
1850                                 $dbw->rollback( __METHOD__ );
1851
1852                                 wfProfileOut( __METHOD__ );
1853                                 return $status;
1854                         }
1855
1856                         $status->merge( $prepStatus );
1857
1858                         // Add the page record; stake our claim on this title!
1859                         // This will return false if the article already exists
1860                         $newid = $this->insertOn( $dbw );
1861
1862                         if ( $newid === false ) {
1863                                 $dbw->rollback( __METHOD__ );
1864                                 $status->fatal( 'edit-already-exists' );
1865
1866                                 wfProfileOut( __METHOD__ );
1867                                 return $status;
1868                         }
1869
1870                         // Save the revision text...
1871                         $revision = new Revision( array(
1872                                 'page'       => $newid,
1873                                 'title'      => $this->getTitle(), // for determining the default content model
1874                                 'comment'    => $summary,
1875                                 'minor_edit' => $isminor,
1876                                 'text'       => $serialized,
1877                                 'len'        => $newsize,
1878                                 'user'       => $user->getId(),
1879                                 'user_text'  => $user->getName(),
1880                                 'timestamp'  => $now,
1881                                 'content_model' => $content->getModel(),
1882                                 'content_format' => $serialisation_format,
1883                         ) );
1884                         $revisionId = $revision->insertOn( $dbw );
1885
1886                         // Bug 37225: use accessor to get the text as Revision may trim it
1887                         $content = $revision->getContent(); // sanity; get normalized version
1888
1889                         if ( $content ) {
1890                                 $newsize = $content->getSize();
1891                         }
1892
1893                         // Update the page record with revision data
1894                         $this->updateRevisionOn( $dbw, $revision, 0 );
1895
1896                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1897
1898                         // Update recentchanges
1899                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1900                                 // Mark as patrolled if the user can do so
1901                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1902                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1903                                 // Add RC row to the DB
1904                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1905                                         '', $newsize, $revisionId, $patrolled );
1906
1907                                 // Log auto-patrolled edits
1908                                 if ( $patrolled ) {
1909                                         PatrolLog::record( $rc, true, $user );
1910                                 }
1911                         }
1912                         $user->incEditCount();
1913                         $dbw->commit( __METHOD__ );
1914
1915                         // Update links, etc.
1916                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1917
1918                         $hook_args = array( &$this, &$user, $content, $summary,
1919                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1920
1921                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1922                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1923                 }
1924
1925                 // Do updates right now unless deferral was requested
1926                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1927                         DeferredUpdates::doUpdates();
1928                 }
1929
1930                 // Return the new revision (or null) to the caller
1931                 $status->value['revision'] = $revision;
1932
1933                 $hook_args = array( &$this, &$user, $content, $summary,
1934                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1935
1936                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1937                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1938
1939                 // Promote user to any groups they meet the criteria for
1940                 $user->addAutopromoteOnceGroups( 'onEdit' );
1941
1942                 wfProfileOut( __METHOD__ );
1943                 return $status;
1944         }
1945
1946         /**
1947          * Get parser options suitable for rendering the primary article wikitext
1948          *
1949          * @see ContentHandler::makeParserOptions
1950          *
1951          * @param IContextSource|User|string $context One of the following:
1952          *        - IContextSource: Use the User and the Language of the provided
1953          *          context
1954          *        - User: Use the provided User object and $wgLang for the language,
1955          *          so use an IContextSource object if possible.
1956          *        - 'canonical': Canonical options (anonymous user with default
1957          *          preferences and content language).
1958          * @return ParserOptions
1959          */
1960         public function makeParserOptions( $context ) {
1961                 $options = $this->getContentHandler()->makeParserOptions( $context );
1962
1963                 if ( $this->getTitle()->isConversionTable() ) {
1964                         // @todo ConversionTable should become a separate content model, so we don't need special cases like this one.
1965                         $options->disableContentConversion();
1966                 }
1967
1968                 return $options;
1969         }
1970
1971         /**
1972          * Prepare text which is about to be saved.
1973          * Returns a stdclass with source, pst and output members
1974          *
1975          * @deprecated in 1.21: use prepareContentForEdit instead.
1976          */
1977         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1978                 ContentHandler::deprecated( __METHOD__, '1.21' );
1979                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1980                 return $this->prepareContentForEdit( $content, $revid, $user );
1981         }
1982
1983         /**
1984          * Prepare content which is about to be saved.
1985          * Returns a stdclass with source, pst and output members
1986          *
1987          * @param \Content $content
1988          * @param null $revid
1989          * @param null|\User $user
1990          * @param null $serialization_format
1991          *
1992          * @return bool|object
1993          *
1994          * @since 1.21
1995          */
1996         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1997                 global $wgContLang, $wgUser;
1998                 $user = is_null( $user ) ? $wgUser : $user;
1999                 //XXX: check $user->getId() here???
2000
2001                 if ( $this->mPreparedEdit
2002                         && $this->mPreparedEdit->newContent
2003                         && $this->mPreparedEdit->newContent->equals( $content )
2004                         && $this->mPreparedEdit->revid == $revid
2005                         && $this->mPreparedEdit->format == $serialization_format
2006                         // XXX: also check $user here?
2007                 ) {
2008                         // Already prepared
2009                         return $this->mPreparedEdit;
2010                 }
2011
2012                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2013                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2014
2015                 $edit = (object)array();
2016                 $edit->revid = $revid;
2017
2018                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2019
2020                 $edit->format = $serialization_format;
2021                 $edit->popts = $this->makeParserOptions( 'canonical' );
2022                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2023
2024                 $edit->newContent = $content;
2025                 $edit->oldContent = $this->getContent( Revision::RAW );
2026
2027                 // NOTE: B/C for hooks! don't use these fields!
2028                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2029                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2030                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2031
2032                 $this->mPreparedEdit = $edit;
2033                 return $edit;
2034         }
2035
2036         /**
2037          * Do standard deferred updates after page edit.
2038          * Update links tables, site stats, search index and message cache.
2039          * Purges pages that include this page if the text was changed here.
2040          * Every 100th edit, prune the recent changes table.
2041          *
2042          * @param $revision Revision object
2043          * @param $user User object that did the revision
2044          * @param array $options of options, following indexes are used:
2045          * - changed: boolean, whether the revision changed the content (default true)
2046          * - created: boolean, whether the revision created the page (default false)
2047          * - oldcountable: boolean or null (default null):
2048          *   - boolean: whether the page was counted as an article before that
2049          *     revision, only used in changed is true and created is false
2050          *   - null: don't change the article count
2051          */
2052         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2053                 global $wgEnableParserCache;
2054
2055                 wfProfileIn( __METHOD__ );
2056
2057                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2058                 $content = $revision->getContent();
2059
2060                 // Parse the text
2061                 // Be careful not to do pre-save transform twice: $text is usually
2062                 // already pre-save transformed once.
2063                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2064                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2065                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2066                 } else {
2067                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2068                         $editInfo = $this->mPreparedEdit;
2069                 }
2070
2071                 // Save it to the parser cache
2072                 if ( $wgEnableParserCache ) {
2073                         $parserCache = ParserCache::singleton();
2074                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2075                 }
2076
2077                 // Update the links tables and other secondary data
2078                 if ( $content ) {
2079                         $recursive = $options['changed']; // bug 50785
2080                         $updates = $content->getSecondaryDataUpdates(
2081                                 $this->getTitle(), null, $recursive, $editInfo->output );
2082                         DataUpdate::runUpdates( $updates );
2083                 }
2084
2085                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2086
2087                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2088                         if ( 0 == mt_rand( 0, 99 ) ) {
2089                                 // Flush old entries from the `recentchanges` table; we do this on
2090                                 // random requests so as to avoid an increase in writes for no good reason
2091                                 RecentChange::purgeExpiredChanges();
2092                         }
2093                 }
2094
2095                 if ( !$this->exists() ) {
2096                         wfProfileOut( __METHOD__ );
2097                         return;
2098                 }
2099
2100                 $id = $this->getId();
2101                 $title = $this->mTitle->getPrefixedDBkey();
2102                 $shortTitle = $this->mTitle->getDBkey();
2103
2104                 if ( !$options['changed'] ) {
2105                         $good = 0;
2106                         $total = 0;
2107                 } elseif ( $options['created'] ) {
2108                         $good = (int)$this->isCountable( $editInfo );
2109                         $total = 1;
2110                 } elseif ( $options['oldcountable'] !== null ) {
2111                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2112                         $total = 0;
2113                 } else {
2114                         $good = 0;
2115                         $total = 0;
2116                 }
2117
2118                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2119                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2120
2121                 // If this is another user's talk page, update newtalk.
2122                 // Don't do this if $options['changed'] = false (null-edits) nor if
2123                 // it's a minor edit and the user doesn't want notifications for those.
2124                 if ( $options['changed']
2125                         && $this->mTitle->getNamespace() == NS_USER_TALK
2126                         && $shortTitle != $user->getTitleKey()
2127                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2128                 ) {
2129                         $recipient = User::newFromName( $shortTitle, false );
2130                         if ( !$recipient ) {
2131                                 wfDebug( __METHOD__ . ": invalid username\n" );
2132                         } else {
2133                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2134                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2135                                         if ( User::isIP( $shortTitle ) ) {
2136                                                 // An anonymous user
2137                                                 $recipient->setNewtalk( true, $revision );
2138                                         } elseif ( $recipient->isLoggedIn() ) {
2139                                                 $recipient->setNewtalk( true, $revision );
2140                                         } else {
2141                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2142                                         }
2143                                 }
2144                         }
2145                 }
2146
2147                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2148                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2149                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2150                         if ( $msgtext === false || $msgtext === null ) {
2151                                 $msgtext = '';
2152                         }
2153
2154                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2155                 }
2156
2157                 if ( $options['created'] ) {
2158                         self::onArticleCreate( $this->mTitle );
2159                 } else {
2160                         self::onArticleEdit( $this->mTitle );
2161                 }
2162
2163                 wfProfileOut( __METHOD__ );
2164         }
2165
2166         /**
2167          * Edit an article without doing all that other stuff
2168          * The article must already exist; link tables etc
2169          * are not updated, caches are not flushed.
2170          *
2171          * @param string $text text submitted
2172          * @param $user User The relevant user
2173          * @param string $comment comment submitted
2174          * @param $minor Boolean: whereas it's a minor modification
2175          *
2176          * @deprecated since 1.21, use doEditContent() instead.
2177          */
2178         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2179                 ContentHandler::deprecated( __METHOD__, "1.21" );
2180
2181                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2182                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2183         }
2184
2185         /**
2186          * Edit an article without doing all that other stuff
2187          * The article must already exist; link tables etc
2188          * are not updated, caches are not flushed.
2189          *
2190          * @param $content Content: content submitted
2191          * @param $user User The relevant user
2192          * @param string $comment comment submitted
2193          * @param $serialisation_format String: format for storing the content in the database
2194          * @param $minor Boolean: whereas it's a minor modification
2195          */
2196         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2197                 wfProfileIn( __METHOD__ );
2198
2199                 $serialized = $content->serialize( $serialisation_format );
2200
2201                 $dbw = wfGetDB( DB_MASTER );
2202                 $revision = new Revision( array(
2203                         'title'      => $this->getTitle(), // for determining the default content model
2204                         'page'       => $this->getId(),
2205                         'text'       => $serialized,
2206                         'length'     => $content->getSize(),
2207                         'comment'    => $comment,
2208                         'minor_edit' => $minor ? 1 : 0,
2209                 ) ); // XXX: set the content object?
2210                 $revision->insertOn( $dbw );
2211                 $this->updateRevisionOn( $dbw, $revision );
2212
2213                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2214
2215                 wfProfileOut( __METHOD__ );
2216         }
2217
2218         /**
2219          * Update the article's restriction field, and leave a log entry.
2220          * This works for protection both existing and non-existing pages.
2221          *
2222          * @param array $limit set of restriction keys
2223          * @param array $expiry per restriction type expiration
2224          * @param int &$cascade Set to false if cascading protection isn't allowed.
2225          * @param string $reason
2226          * @param User $user The user updating the restrictions
2227          * @return Status
2228          */
2229         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2230                 global $wgCascadingRestrictionLevels;
2231
2232                 if ( wfReadOnly() ) {
2233                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2234                 }
2235
2236                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2237
2238                 $id = $this->getId();
2239
2240                 if ( !$cascade ) {
2241                         $cascade = false;
2242                 }
2243
2244                 // Take this opportunity to purge out expired restrictions
2245                 Title::purgeExpiredRestrictions();
2246
2247                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2248                 // we expect a single selection, but the schema allows otherwise.
2249                 $isProtected = false;
2250                 $protect = false;
2251                 $changed = false;
2252
2253                 $dbw = wfGetDB( DB_MASTER );
2254
2255                 foreach ( $restrictionTypes as $action ) {
2256                         if ( !isset( $expiry[$action] ) ) {
2257                                 $expiry[$action] = $dbw->getInfinity();
2258                         }
2259                         if ( !isset( $limit[$action] ) ) {
2260                                 $limit[$action] = '';
2261                         } elseif ( $limit[$action] != '' ) {
2262                                 $protect = true;
2263                         }
2264
2265                         // Get current restrictions on $action
2266                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2267                         if ( $current != '' ) {
2268                                 $isProtected = true;
2269                         }
2270
2271                         if ( $limit[$action] != $current ) {
2272                                 $changed = true;
2273                         } elseif ( $limit[$action] != '' ) {
2274                                 // Only check expiry change if the action is actually being
2275                                 // protected, since expiry does nothing on an not-protected
2276                                 // action.
2277                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2278                                         $changed = true;
2279                                 }
2280                         }
2281                 }
2282
2283                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2284                         $changed = true;
2285                 }
2286
2287                 // If nothing has changed, do nothing
2288                 if ( !$changed ) {
2289                         return Status::newGood();
2290                 }
2291
2292                 if ( !$protect ) { // No protection at all means unprotection
2293                         $revCommentMsg = 'unprotectedarticle';
2294                         $logAction = 'unprotect';
2295                 } elseif ( $isProtected ) {
2296                         $revCommentMsg = 'modifiedarticleprotection';
2297                         $logAction = 'modify';
2298                 } else {
2299                         $revCommentMsg = 'protectedarticle';
2300                         $logAction = 'protect';
2301                 }
2302
2303                 if ( $id ) { // Protection of existing page
2304                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2305                                 return Status::newGood();
2306                         }
2307
2308                         // Only certain restrictions can cascade...
2309                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2310                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2311                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2312                         }
2313                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2314                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2315                         }
2316
2317                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2318                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2319                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2320                         }
2321                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2322                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2323                         }
2324
2325                         // The schema allows multiple restrictions
2326                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2327                                 $cascade = false;
2328                         }
2329
2330                         // insert null revision to identify the page protection change as edit summary
2331                         $latest = $this->getLatest();
2332                         $nullRevision = $this->insertProtectNullRevision( $revCommentMsg, $limit, $expiry, $cascade, $reason );
2333                         if ( $nullRevision === null ) {
2334                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2335                         }
2336
2337                         // Update restrictions table
2338                         foreach ( $limit as $action => $restrictions ) {
2339                                 if ( $restrictions != '' ) {
2340                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2341                                                 array( 'pr_page' => $id,
2342                                                         'pr_type' => $action,
2343                                                         'pr_level' => $restrictions,
2344                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2345                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2346                                                 ),
2347                                                 __METHOD__
2348                                         );
2349                                 } else {
2350                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2351                                                 'pr_type' => $action ), __METHOD__ );
2352                                 }
2353                         }
2354
2355                         // Clear out legacy restriction fields
2356                         $dbw->update(
2357                                 'page',
2358                                 array( 'page_restrictions' => '' ),
2359                                 array( 'page_id' => $id ),
2360                                 __METHOD__
2361                         );
2362
2363                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2364                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2365                 } else { // Protection of non-existing page (also known as "title protection")
2366                         // Cascade protection is meaningless in this case
2367                         $cascade = false;
2368
2369                         if ( $limit['create'] != '' ) {
2370                                 $dbw->replace( 'protected_titles',
2371                                         array( array( 'pt_namespace', 'pt_title' ) ),
2372                                         array(
2373                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2374                                                 'pt_title' => $this->mTitle->getDBkey(),
2375                                                 'pt_create_perm' => $limit['create'],
2376                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2377                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2378                                                 'pt_user' => $user->getId(),
2379                                                 'pt_reason' => $reason,
2380                                         ), __METHOD__
2381                                 );
2382                         } else {
2383                                 $dbw->delete( 'protected_titles',
2384                                         array(
2385                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2386                                                 'pt_title' => $this->mTitle->getDBkey()
2387                                         ), __METHOD__
2388                                 );
2389                         }
2390                 }
2391
2392                 $this->mTitle->flushRestrictions();
2393                 InfoAction::invalidateCache( $this->mTitle );
2394
2395                 if ( $logAction == 'unprotect' ) {
2396                         $params = array();
2397                 } else {
2398                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2399                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2400                 }
2401
2402                 // Update the protection log
2403                 $log = new LogPage( 'protect' );
2404                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $params, $user );
2405
2406                 return Status::newGood();
2407         }
2408
2409         /**
2410          * Insert a new null revision for this page.
2411          *
2412          * @param string $revCommentMsg comment message key for the revision
2413          * @param array $limit set of restriction keys
2414          * @param array $expiry per restriction type expiration
2415          * @param int $cascade Set to false if cascading protection isn't allowed.
2416          * @param string $reason
2417          * @return Revision|null on error
2418          */
2419         public function insertProtectNullRevision( $revCommentMsg, array $limit, array $expiry, $cascade, $reason ) {
2420                 global $wgContLang;
2421                 $dbw = wfGetDB( DB_MASTER );
2422
2423                 // Prepare a null revision to be added to the history
2424                 $editComment = $wgContLang->ucfirst(
2425                         wfMessage(
2426                                 $revCommentMsg,
2427                                 $this->mTitle->getPrefixedText()
2428                         )->inContentLanguage()->text()
2429                 );
2430                 if ( $reason ) {
2431                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2432                 }
2433                 $protectDescription = $this->protectDescription( $limit, $expiry );
2434                 if ( $protectDescription ) {
2435                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2436                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2437                 }
2438                 if ( $cascade ) {
2439                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2440                         $editComment .= wfMessage( 'brackets' )->params(
2441                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2442                         )->inContentLanguage()->text();
2443                 }
2444
2445                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true );
2446                 if ( $nullRev ) {
2447                         $nullRev->insertOn( $dbw );
2448
2449                         // Update page record and touch page
2450                         $oldLatest = $nullRev->getParentId();
2451                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2452                 }
2453
2454                 return $nullRev;
2455         }
2456
2457         /**
2458          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2459          * @return string
2460          */
2461         protected function formatExpiry( $expiry ) {
2462                 global $wgContLang;
2463                 $dbr = wfGetDB( DB_SLAVE );
2464
2465                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2466                 if ( $encodedExpiry != 'infinity' ) {
2467                         return wfMessage(
2468                                 'protect-expiring',
2469                                 $wgContLang->timeanddate( $expiry, false, false ),
2470                                 $wgContLang->date( $expiry, false, false ),
2471                                 $wgContLang->time( $expiry, false, false )
2472                         )->inContentLanguage()->text();
2473                 } else {
2474                         return wfMessage( 'protect-expiry-indefinite' )
2475                                 ->inContentLanguage()->text();
2476                 }
2477         }
2478
2479         /**
2480          * Builds the description to serve as comment for the edit.
2481          *
2482          * @param array $limit set of restriction keys
2483          * @param array $expiry per restriction type expiration
2484          * @return string
2485          */
2486         public function protectDescription( array $limit, array $expiry ) {
2487                 $protectDescription = '';
2488
2489                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2490                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2491                         # All possible message keys are listed here for easier grepping:
2492                         # * restriction-create
2493                         # * restriction-edit
2494                         # * restriction-move
2495                         # * restriction-upload
2496                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2497                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2498                         # with '' filtered out. All possible message keys are listed below:
2499                         # * protect-level-autoconfirmed
2500                         # * protect-level-sysop
2501                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2502
2503                         $expiryText = $this->formatExpiry( $expiry[$action] );
2504
2505                         if ( $protectDescription !== '' ) {
2506                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2507                         }
2508                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2509                                 ->params( $actionText, $restrictionsText, $expiryText )
2510                                 ->inContentLanguage()->text();
2511                 }
2512
2513                 return $protectDescription;
2514         }
2515
2516         /**
2517          * Builds the description to serve as comment for the log entry.
2518          *
2519          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2520          * protect description text. Keep them in old format to avoid breaking compatibility.
2521          * TODO: Fix protection log to store structured description and format it on-the-fly.
2522          *
2523          * @param array $limit set of restriction keys
2524          * @param array $expiry per restriction type expiration
2525          * @return string
2526          */
2527         public function protectDescriptionLog( array $limit, array $expiry ) {
2528                 global $wgContLang;
2529
2530                 $protectDescriptionLog = '';
2531
2532                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2533                         $expiryText = $this->formatExpiry( $expiry[$action] );
2534                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2535                 }
2536
2537                 return trim( $protectDescriptionLog );
2538         }
2539
2540         /**
2541          * Take an array of page restrictions and flatten it to a string
2542          * suitable for insertion into the page_restrictions field.
2543          * @param $limit Array
2544          * @throws MWException
2545          * @return String
2546          */
2547         protected static function flattenRestrictions( $limit ) {
2548                 if ( !is_array( $limit ) ) {
2549                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2550                 }
2551
2552                 $bits = array();
2553                 ksort( $limit );
2554
2555                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2556                         $bits[] = "$action=$restrictions";
2557                 }
2558
2559                 return implode( ':', $bits );
2560         }
2561
2562         /**
2563          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2564          * backwards compatibility, if you care about error reporting you should use
2565          * doDeleteArticleReal() instead.
2566          *
2567          * Deletes the article with database consistency, writes logs, purges caches
2568          *
2569          * @param string $reason delete reason for deletion log
2570          * @param $suppress boolean suppress all revisions and log the deletion in
2571          *        the suppression log instead of the deletion log
2572          * @param int $id article ID
2573          * @param $commit boolean defaults to true, triggers transaction end
2574          * @param &$error Array of errors to append to
2575          * @param $user User The deleting user
2576          * @return boolean true if successful
2577          */
2578         public function doDeleteArticle(
2579                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2580         ) {
2581                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2582                 return $status->isGood();
2583         }
2584
2585         /**
2586          * Back-end article deletion
2587          * Deletes the article with database consistency, writes logs, purges caches
2588          *
2589          * @since 1.19
2590          *
2591          * @param string $reason delete reason for deletion log
2592          * @param $suppress boolean suppress all revisions and log the deletion in
2593          *        the suppression log instead of the deletion log
2594          * @param int $id article ID
2595          * @param $commit boolean defaults to true, triggers transaction end
2596          * @param &$error Array of errors to append to
2597          * @param $user User The deleting user
2598          * @return Status: Status object; if successful, $status->value is the log_id of the
2599          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2600          *                 found, $status is a non-fatal 'cannotdelete' error
2601          */
2602         public function doDeleteArticleReal(
2603                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2604         ) {
2605                 global $wgUser, $wgContentHandlerUseDB;
2606
2607                 wfDebug( __METHOD__ . "\n" );
2608
2609                 $status = Status::newGood();
2610
2611                 if ( $this->mTitle->getDBkey() === '' ) {
2612                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2613                         return $status;
2614                 }
2615
2616                 $user = is_null( $user ) ? $wgUser : $user;
2617                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2618                         if ( $status->isOK() ) {
2619                                 // Hook aborted but didn't set a fatal status
2620                                 $status->fatal( 'delete-hook-aborted' );
2621                         }
2622                         return $status;
2623                 }
2624
2625                 if ( $id == 0 ) {
2626                         $this->loadPageData( 'forupdate' );
2627                         $id = $this->getID();
2628                         if ( $id == 0 ) {
2629                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2630                                 return $status;
2631                         }
2632                 }
2633
2634                 // Bitfields to further suppress the content
2635                 if ( $suppress ) {
2636                         $bitfield = 0;
2637                         // This should be 15...
2638                         $bitfield |= Revision::DELETED_TEXT;
2639                         $bitfield |= Revision::DELETED_COMMENT;
2640                         $bitfield |= Revision::DELETED_USER;
2641                         $bitfield |= Revision::DELETED_RESTRICTED;
2642                 } else {
2643                         $bitfield = 'rev_deleted';
2644                 }
2645
2646                 // we need to remember the old content so we can use it to generate all deletion updates.
2647                 $content = $this->getContent( Revision::RAW );
2648
2649                 $dbw = wfGetDB( DB_MASTER );
2650                 $dbw->begin( __METHOD__ );
2651                 // For now, shunt the revision data into the archive table.
2652                 // Text is *not* removed from the text table; bulk storage
2653                 // is left intact to avoid breaking block-compression or
2654                 // immutable storage schemes.
2655                 //
2656                 // For backwards compatibility, note that some older archive
2657                 // table entries will have ar_text and ar_flags fields still.
2658                 //
2659                 // In the future, we may keep revisions and mark them with
2660                 // the rev_deleted field, which is reserved for this purpose.
2661
2662                 $row = array(
2663                         'ar_namespace'  => 'page_namespace',
2664                         'ar_title'      => 'page_title',
2665                         'ar_comment'    => 'rev_comment',
2666                         'ar_user'       => 'rev_user',
2667                         'ar_user_text'  => 'rev_user_text',
2668                         'ar_timestamp'  => 'rev_timestamp',
2669                         'ar_minor_edit' => 'rev_minor_edit',
2670                         'ar_rev_id'     => 'rev_id',
2671                         'ar_parent_id'  => 'rev_parent_id',
2672                         'ar_text_id'    => 'rev_text_id',
2673                         'ar_text'       => '\'\'', // Be explicit to appease
2674                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2675                         'ar_len'        => 'rev_len',
2676                         'ar_page_id'    => 'page_id',
2677                         'ar_deleted'    => $bitfield,
2678                         'ar_sha1'       => 'rev_sha1',
2679                 );
2680
2681                 if ( $wgContentHandlerUseDB ) {
2682                         $row['ar_content_model'] = 'rev_content_model';
2683                         $row['ar_content_format'] = 'rev_content_format';
2684                 }
2685
2686                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2687                         $row,
2688                         array(
2689                                 'page_id' => $id,
2690                                 'page_id = rev_page'
2691                         ), __METHOD__
2692                 );
2693
2694                 // Now that it's safely backed up, delete it
2695                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2696                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2697
2698                 if ( !$ok ) {
2699                         $dbw->rollback( __METHOD__ );
2700                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2701                         return $status;
2702                 }
2703
2704                 if ( !$dbw->cascadingDeletes() ) {
2705                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2706                 }
2707
2708                 $this->doDeleteUpdates( $id, $content );
2709
2710                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2711                 $logtype = $suppress ? 'suppress' : 'delete';
2712
2713                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2714                 $logEntry->setPerformer( $user );
2715                 $logEntry->setTarget( $this->mTitle );
2716                 $logEntry->setComment( $reason );
2717                 $logid = $logEntry->insert();
2718                 $logEntry->publish( $logid );
2719
2720                 if ( $commit ) {
2721                         $dbw->commit( __METHOD__ );
2722                 }
2723
2724                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2725                 $status->value = $logid;
2726                 return $status;
2727         }
2728
2729         /**
2730          * Do some database updates after deletion
2731          *
2732          * @param int $id page_id value of the page being deleted
2733          * @param $content Content: optional page content to be used when determining the required updates.
2734          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2735          */
2736         public function doDeleteUpdates( $id, Content $content = null ) {
2737                 // update site status
2738                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2739
2740                 // remove secondary indexes, etc
2741                 $updates = $this->getDeletionUpdates( $content );
2742                 DataUpdate::runUpdates( $updates );
2743
2744                 // Clear caches
2745                 WikiPage::onArticleDelete( $this->mTitle );
2746
2747                 // Reset this object and the Title object
2748                 $this->loadFromRow( false, self::READ_LATEST );
2749
2750                 // Search engine
2751                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2752         }
2753
2754         /**
2755          * Roll back the most recent consecutive set of edits to a page
2756          * from the same user; fails if there are no eligible edits to
2757          * roll back to, e.g. user is the sole contributor. This function
2758          * performs permissions checks on $user, then calls commitRollback()
2759          * to do the dirty work
2760          *
2761          * @todo Separate the business/permission stuff out from backend code
2762          *
2763          * @param string $fromP Name of the user whose edits to rollback.
2764          * @param string $summary Custom summary. Set to default summary if empty.
2765          * @param string $token Rollback token.
2766          * @param $bot Boolean: If true, mark all reverted edits as bot.
2767          *
2768          * @param array $resultDetails contains result-specific array of additional values
2769          *    'alreadyrolled' : 'current' (rev)
2770          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2771          *
2772          * @param $user User The user performing the rollback
2773          * @return array of errors, each error formatted as
2774          *   array(messagekey, param1, param2, ...).
2775          * On success, the array is empty.  This array can also be passed to
2776          * OutputPage::showPermissionsErrorPage().
2777          */
2778         public function doRollback(
2779                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2780         ) {
2781                 $resultDetails = null;
2782
2783                 // Check permissions
2784                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2785                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2786                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2787
2788                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2789                         $errors[] = array( 'sessionfailure' );
2790                 }
2791
2792                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2793                         $errors[] = array( 'actionthrottledtext' );
2794                 }
2795
2796                 // If there were errors, bail out now
2797                 if ( !empty( $errors ) ) {
2798                         return $errors;
2799                 }
2800
2801                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2802         }
2803
2804         /**
2805          * Backend implementation of doRollback(), please refer there for parameter
2806          * and return value documentation
2807          *
2808          * NOTE: This function does NOT check ANY permissions, it just commits the
2809          * rollback to the DB. Therefore, you should only call this function direct-
2810          * ly if you want to use custom permissions checks. If you don't, use
2811          * doRollback() instead.
2812          * @param string $fromP Name of the user whose edits to rollback.
2813          * @param string $summary Custom summary. Set to default summary if empty.
2814          * @param $bot Boolean: If true, mark all reverted edits as bot.
2815          *
2816          * @param array $resultDetails contains result-specific array of additional values
2817          * @param $guser User The user performing the rollback
2818          * @return array
2819          */
2820         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2821                 global $wgUseRCPatrol, $wgContLang;
2822
2823                 $dbw = wfGetDB( DB_MASTER );
2824
2825                 if ( wfReadOnly() ) {
2826                         return array( array( 'readonlytext' ) );
2827                 }
2828
2829                 // Get the last editor
2830                 $current = $this->getRevision();
2831                 if ( is_null( $current ) ) {
2832                         // Something wrong... no page?
2833                         return array( array( 'notanarticle' ) );
2834                 }
2835
2836                 $from = str_replace( '_', ' ', $fromP );
2837                 // User name given should match up with the top revision.
2838                 // If the user was deleted then $from should be empty.
2839                 if ( $from != $current->getUserText() ) {
2840                         $resultDetails = array( 'current' => $current );
2841                         return array( array( 'alreadyrolled',
2842                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2843                                 htmlspecialchars( $fromP ),
2844                                 htmlspecialchars( $current->getUserText() )
2845                         ) );
2846                 }
2847
2848                 // Get the last edit not by this guy...
2849                 // Note: these may not be public values
2850                 $user = intval( $current->getRawUser() );
2851                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2852                 $s = $dbw->selectRow( 'revision',
2853                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2854                         array( 'rev_page' => $current->getPage(),
2855                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2856                         ), __METHOD__,
2857                         array( 'USE INDEX' => 'page_timestamp',
2858                                 'ORDER BY' => 'rev_timestamp DESC' )
2859                         );
2860                 if ( $s === false ) {
2861                         // No one else ever edited this page
2862                         return array( array( 'cantrollback' ) );
2863                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2864                         // Only admins can see this text
2865                         return array( array( 'notvisiblerev' ) );
2866                 }
2867
2868                 $set = array();
2869                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2870                         // Mark all reverted edits as bot
2871                         $set['rc_bot'] = 1;
2872                 }
2873
2874                 if ( $wgUseRCPatrol ) {
2875                         // Mark all reverted edits as patrolled
2876                         $set['rc_patrolled'] = 1;
2877                 }
2878
2879                 if ( count( $set ) ) {
2880                         $dbw->update( 'recentchanges', $set,
2881                                 array( /* WHERE */
2882                                         'rc_cur_id' => $current->getPage(),
2883                                         'rc_user_text' => $current->getUserText(),
2884                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2885                                 ), __METHOD__
2886                         );
2887                 }
2888
2889                 // Generate the edit summary if necessary
2890                 $target = Revision::newFromId( $s->rev_id );
2891                 if ( empty( $summary ) ) {
2892                         if ( $from == '' ) { // no public user name
2893                                 $summary = wfMessage( 'revertpage-nouser' );
2894                         } else {
2895                                 $summary = wfMessage( 'revertpage' );
2896                         }
2897                 }
2898
2899                 // Allow the custom summary to use the same args as the default message
2900                 $args = array(
2901                         $target->getUserText(), $from, $s->rev_id,
2902                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2903                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2904                 );
2905                 if ( $summary instanceof Message ) {
2906                         $summary = $summary->params( $args )->inContentLanguage()->text();
2907                 } else {
2908                         $summary = wfMsgReplaceArgs( $summary, $args );
2909                 }
2910
2911                 // Trim spaces on user supplied text
2912                 $summary = trim( $summary );
2913
2914                 // Truncate for whole multibyte characters.
2915                 $summary = $wgContLang->truncate( $summary, 255 );
2916
2917                 // Save
2918                 $flags = EDIT_UPDATE;
2919
2920                 if ( $guser->isAllowed( 'minoredit' ) ) {
2921                         $flags |= EDIT_MINOR;
2922                 }
2923
2924                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2925                         $flags |= EDIT_FORCE_BOT;
2926                 }
2927
2928                 // Actually store the edit
2929                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2930
2931                 if ( !$status->isOK() ) {
2932                         return $status->getErrorsArray();
2933                 }
2934
2935                 if ( !empty( $status->value['revision'] ) ) {
2936                         $revId = $status->value['revision']->getId();
2937                 } else {
2938                         $revId = false;
2939                 }
2940
2941                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2942
2943                 $resultDetails = array(
2944                         'summary' => $summary,
2945                         'current' => $current,
2946                         'target' => $target,
2947                         'newid' => $revId
2948                 );
2949
2950                 return array();
2951         }
2952
2953         /**
2954          * The onArticle*() functions are supposed to be a kind of hooks
2955          * which should be called whenever any of the specified actions
2956          * are done.
2957          *
2958          * This is a good place to put code to clear caches, for instance.
2959          *
2960          * This is called on page move and undelete, as well as edit
2961          *
2962          * @param $title Title object
2963          */
2964         public static function onArticleCreate( $title ) {
2965                 // Update existence markers on article/talk tabs...
2966                 if ( $title->isTalkPage() ) {
2967                         $other = $title->getSubjectPage();
2968                 } else {
2969                         $other = $title->getTalkPage();
2970                 }
2971
2972                 $other->invalidateCache();
2973                 $other->purgeSquid();
2974
2975                 $title->touchLinks();
2976                 $title->purgeSquid();
2977                 $title->deleteTitleProtection();
2978         }
2979
2980         /**
2981          * Clears caches when article is deleted
2982          *
2983          * @param $title Title
2984          */
2985         public static function onArticleDelete( $title ) {
2986                 // Update existence markers on article/talk tabs...
2987                 if ( $title->isTalkPage() ) {
2988                         $other = $title->getSubjectPage();
2989                 } else {
2990                         $other = $title->getTalkPage();
2991                 }
2992
2993                 $other->invalidateCache();
2994                 $other->purgeSquid();
2995
2996                 $title->touchLinks();
2997                 $title->purgeSquid();
2998
2999                 // File cache
3000                 HTMLFileCache::clearFileCache( $title );
3001                 InfoAction::invalidateCache( $title );
3002
3003                 // Messages
3004                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3005                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3006                 }
3007
3008                 // Images
3009                 if ( $title->getNamespace() == NS_FILE ) {
3010                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3011                         $update->doUpdate();
3012                 }
3013
3014                 // User talk pages
3015                 if ( $title->getNamespace() == NS_USER_TALK ) {
3016                         $user = User::newFromName( $title->getText(), false );
3017                         if ( $user ) {
3018                                 $user->setNewtalk( false );
3019                         }
3020                 }
3021
3022                 // Image redirects
3023                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3024         }
3025
3026         /**
3027          * Purge caches on page update etc
3028          *
3029          * @param $title Title object
3030          * @todo Verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3031          */
3032         public static function onArticleEdit( $title ) {
3033                 // Invalidate caches of articles which include this page
3034                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3035
3036                 // Invalidate the caches of all pages which redirect here
3037                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3038
3039                 // Purge squid for this page only
3040                 $title->purgeSquid();
3041
3042                 // Clear file cache for this page only
3043                 HTMLFileCache::clearFileCache( $title );
3044                 InfoAction::invalidateCache( $title );
3045         }
3046
3047         /**#@-*/
3048
3049         /**
3050          * Returns a list of categories this page is a member of.
3051          * Results will include hidden categories
3052          *
3053          * @return TitleArray
3054          */
3055         public function getCategories() {
3056                 $id = $this->getId();
3057                 if ( $id == 0 ) {
3058                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3059                 }
3060
3061                 $dbr = wfGetDB( DB_SLAVE );
3062                 $res = $dbr->select( 'categorylinks',
3063                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3064                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3065                         // as not being aliases, and NS_CATEGORY is numeric
3066                         array( 'cl_from' => $id ),
3067                         __METHOD__ );
3068
3069                 return TitleArray::newFromResult( $res );
3070         }
3071
3072         /**
3073          * Returns a list of hidden categories this page is a member of.
3074          * Uses the page_props and categorylinks tables.
3075          *
3076          * @return Array of Title objects
3077          */
3078         public function getHiddenCategories() {
3079                 $result = array();
3080                 $id = $this->getId();
3081
3082                 if ( $id == 0 ) {
3083                         return array();
3084                 }
3085
3086                 $dbr = wfGetDB( DB_SLAVE );
3087                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3088                         array( 'cl_to' ),
3089                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3090                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3091                         __METHOD__ );
3092
3093                 if ( $res !== false ) {
3094                         foreach ( $res as $row ) {
3095                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3096                         }
3097                 }
3098
3099                 return $result;
3100         }
3101
3102         /**
3103          * Return an applicable autosummary if one exists for the given edit.
3104          * @param string|null $oldtext the previous text of the page.
3105          * @param string|null $newtext The submitted text of the page.
3106          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
3107          * @return string An appropriate autosummary, or an empty string.
3108          *
3109          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3110          */
3111         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3112                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
3113
3114                 ContentHandler::deprecated( __METHOD__, '1.21' );
3115
3116                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3117                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3118                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3119
3120                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3121         }
3122
3123         /**
3124          * Auto-generates a deletion reason
3125          *
3126          * @param &$hasHistory Boolean: whether the page has a history
3127          * @return mixed String containing deletion reason or empty string, or boolean false
3128          *    if no revision occurred
3129          */
3130         public function getAutoDeleteReason( &$hasHistory ) {
3131                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3132         }
3133
3134         /**
3135          * Update all the appropriate counts in the category table, given that
3136          * we've added the categories $added and deleted the categories $deleted.
3137          *
3138          * @param array $added   The names of categories that were added
3139          * @param array $deleted The names of categories that were deleted
3140          */
3141         public function updateCategoryCounts( array $added, array $deleted ) {
3142                 $that = $this;
3143                 $method = __METHOD__;
3144                 $dbw = wfGetDB( DB_MASTER );
3145
3146                 // Do this at the end of the commit to reduce lock wait timeouts
3147                 $dbw->onTransactionPreCommitOrIdle(
3148                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3149                                 $ns = $that->getTitle()->getNamespace();
3150
3151                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3152                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3153                                 if ( $ns == NS_CATEGORY ) {
3154                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3155                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3156                                 } elseif ( $ns == NS_FILE ) {
3157                                         $addFields[] = 'cat_files = cat_files + 1';
3158                                         $removeFields[] = 'cat_files = cat_files - 1';
3159                                 }
3160
3161                                 if ( count( $added ) ) {
3162                                         $insertRows = array();
3163                                         foreach ( $added as $cat ) {
3164                                                 $insertRows[] = array(
3165                                                         'cat_title'   => $cat,
3166                                                         'cat_pages'   => 1,
3167                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3168                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3169                                                 );
3170                                         }
3171                                         $dbw->upsert(
3172                                                 'category',
3173                                                 $insertRows,
3174                                                 array( 'cat_title' ),
3175                                                 $addFields,
3176                                                 $method
3177                                         );
3178                                 }
3179
3180                                 if ( count( $deleted ) ) {
3181                                         $dbw->update(
3182                                                 'category',
3183                                                 $removeFields,
3184                                                 array( 'cat_title' => $deleted ),
3185                                                 $method
3186                                         );
3187                                 }
3188
3189                                 foreach ( $added as $catName ) {
3190                                         $cat = Category::newFromName( $catName );
3191                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3192                                 }
3193
3194                                 foreach ( $deleted as $catName ) {
3195                                         $cat = Category::newFromName( $catName );
3196                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3197                                 }
3198                         }
3199                 );
3200         }
3201
3202         /**
3203          * Updates cascading protections
3204          *
3205          * @param $parserOutput ParserOutput object for the current version
3206          */
3207         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3208                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3209                         return;
3210                 }
3211
3212                 // templatelinks table may have become out of sync,
3213                 // especially if using variable-based transclusions.
3214                 // For paranoia, check if things have changed and if
3215                 // so apply updates to the database. This will ensure
3216                 // that cascaded protections apply as soon as the changes
3217                 // are visible.
3218
3219                 // Get templates from templatelinks
3220                 $id = $this->getId();
3221
3222                 $tlTemplates = array();
3223
3224                 $dbr = wfGetDB( DB_SLAVE );
3225                 $res = $dbr->select( array( 'templatelinks' ),
3226                         array( 'tl_namespace', 'tl_title' ),
3227                         array( 'tl_from' => $id ),
3228                         __METHOD__
3229                 );
3230
3231                 foreach ( $res as $row ) {
3232                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3233                 }
3234
3235                 // Get templates from parser output.
3236                 $poTemplates = array();
3237                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3238                         foreach ( $templates as $dbk => $id ) {
3239                                 $poTemplates["$ns:$dbk"] = true;
3240                         }
3241                 }
3242
3243                 // Get the diff
3244                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3245
3246                 if ( count( $templates_diff ) > 0 ) {
3247                         // Whee, link updates time.
3248                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3249                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3250                         $u->doUpdate();
3251                 }
3252         }
3253
3254         /**
3255          * Return a list of templates used by this article.
3256          * Uses the templatelinks table
3257          *
3258          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3259          * @return Array of Title objects
3260          */
3261         public function getUsedTemplates() {
3262                 return $this->mTitle->getTemplateLinksFrom();
3263         }
3264
3265         /**
3266          * Perform article updates on a special page creation.
3267          *
3268          * @param $rev Revision object
3269          *
3270          * @todo This is a shitty interface function. Kill it and replace the
3271          * other shitty functions like doEditUpdates and such so it's not needed
3272          * anymore.
3273          * @deprecated since 1.18, use doEditUpdates()
3274          */
3275         public function createUpdates( $rev ) {
3276                 wfDeprecated( __METHOD__, '1.18' );
3277                 global $wgUser;
3278                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3279         }
3280
3281         /**
3282          * This function is called right before saving the wikitext,
3283          * so we can do things like signatures and links-in-context.
3284          *
3285          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3286          * @param string $text article contents
3287          * @param $user User object: user doing the edit
3288          * @param $popts ParserOptions object: parser options, default options for
3289          *               the user loaded if null given
3290          * @return string article contents with altered wikitext markup (signatures
3291          *      converted, {{subst:}}, templates, etc.)
3292          */
3293         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3294                 global $wgParser, $wgUser;
3295
3296                 wfDeprecated( __METHOD__, '1.19' );
3297
3298                 $user = is_null( $user ) ? $wgUser : $user;
3299
3300                 if ( $popts === null ) {
3301                         $popts = ParserOptions::newFromUser( $user );
3302                 }
3303
3304                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3305         }
3306
3307         /**
3308          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3309          *
3310          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3311          * @return bool
3312          */
3313         public function isBigDeletion() {
3314                 wfDeprecated( __METHOD__, '1.19' );
3315                 return $this->mTitle->isBigDeletion();
3316         }
3317
3318         /**
3319          * Get the  approximate revision count of this page.
3320          *
3321          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3322          * @return int
3323          */
3324         public function estimateRevisionCount() {
3325                 wfDeprecated( __METHOD__, '1.19' );
3326                 return $this->mTitle->estimateRevisionCount();
3327         }
3328
3329         /**
3330          * Update the article's restriction field, and leave a log entry.
3331          *
3332          * @deprecated since 1.19
3333          * @param array $limit set of restriction keys
3334          * @param $reason String
3335          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3336          * @param array $expiry per restriction type expiration
3337          * @param $user User The user updating the restrictions
3338          * @return bool true on success
3339          */
3340         public function updateRestrictions(
3341                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3342         ) {
3343                 global $wgUser;
3344
3345                 $user = is_null( $user ) ? $wgUser : $user;
3346
3347                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3348         }
3349
3350         /**
3351          * @deprecated since 1.18
3352          */
3353         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3354                 wfDeprecated( __METHOD__, '1.18' );
3355                 global $wgUser;
3356                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3357         }
3358
3359         /**
3360          * @deprecated since 1.18
3361          */
3362         public function viewUpdates() {
3363                 wfDeprecated( __METHOD__, '1.18' );
3364                 global $wgUser;
3365                 $this->doViewUpdates( $wgUser );
3366         }
3367
3368         /**
3369          * @deprecated since 1.18
3370          * @param $oldid int
3371          * @return bool
3372          */
3373         public function useParserCache( $oldid ) {
3374                 wfDeprecated( __METHOD__, '1.18' );
3375                 global $wgUser;
3376                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3377         }
3378
3379         /**
3380          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3381          * about this page from secondary data stores such as links tables.
3382          *
3383          * @param Content|null $content optional Content object for determining the necessary updates
3384          * @return Array an array of DataUpdates objects
3385          */
3386         public function getDeletionUpdates( Content $content = null ) {
3387                 if ( !$content ) {
3388                         // load content object, which may be used to determine the necessary updates
3389                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3390                         $content = $this->getContent( Revision::RAW );
3391                 }
3392
3393                 if ( !$content ) {
3394                         $updates = array();
3395                 } else {
3396                         $updates = $content->getDeletionUpdates( $this );
3397                 }
3398
3399                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3400                 return $updates;
3401         }
3402
3403 }
3404
3405 class PoolWorkArticleView extends PoolCounterWork {
3406
3407         /**
3408          * @var Page
3409          */
3410         private $page;
3411
3412         /**
3413          * @var string
3414          */
3415         private $cacheKey;
3416
3417         /**
3418          * @var integer
3419          */
3420         private $revid;
3421
3422         /**
3423          * @var ParserOptions
3424          */
3425         private $parserOptions;
3426
3427         /**
3428          * @var Content|null
3429          */
3430         private $content = null;
3431
3432         /**
3433          * @var ParserOutput|bool
3434          */
3435         private $parserOutput = false;
3436
3437         /**
3438          * @var bool
3439          */
3440         private $isDirty = false;
3441
3442         /**
3443          * @var Status|bool
3444          */
3445         private $error = false;
3446
3447         /**
3448          * Constructor
3449          *
3450          * @param $page Page|WikiPage
3451          * @param $revid Integer: ID of the revision being parsed
3452          * @param $useParserCache Boolean: whether to use the parser cache
3453          * @param $parserOptions parserOptions to use for the parse operation
3454          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3455          */
3456         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3457                 if ( is_string( $content ) ) { // BC: old style call
3458                         $modelId = $page->getRevision()->getContentModel();
3459                         $format = $page->getRevision()->getContentFormat();
3460                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3461                 }
3462
3463                 $this->page = $page;
3464                 $this->revid = $revid;
3465                 $this->cacheable = $useParserCache;
3466                 $this->parserOptions = $parserOptions;
3467                 $this->content = $content;
3468                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3469                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3470         }
3471
3472         /**
3473          * Get the ParserOutput from this object, or false in case of failure
3474          *
3475          * @return ParserOutput
3476          */
3477         public function getParserOutput() {
3478                 return $this->parserOutput;
3479         }
3480
3481         /**
3482          * Get whether the ParserOutput is a dirty one (i.e. expired)
3483          *
3484          * @return bool
3485          */
3486         public function getIsDirty() {
3487                 return $this->isDirty;
3488         }
3489
3490         /**
3491          * Get a Status object in case of error or false otherwise
3492          *
3493          * @return Status|bool
3494          */
3495         public function getError() {
3496                 return $this->error;
3497         }
3498
3499         /**
3500          * @return bool
3501          */
3502         function doWork() {
3503                 global $wgUseFileCache;
3504
3505                 // @todo several of the methods called on $this->page are not declared in Page, but present
3506                 //        in WikiPage and delegated by Article.
3507
3508                 $isCurrent = $this->revid === $this->page->getLatest();
3509
3510                 if ( $this->content !== null ) {
3511                         $content = $this->content;
3512                 } elseif ( $isCurrent ) {
3513                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3514                         $content = $this->page->getContent( Revision::RAW );
3515                 } else {
3516                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3517
3518                         if ( $rev === null ) {
3519                                 $content = null;
3520                         } else {
3521                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3522                                 $content = $rev->getContent();
3523                         }
3524                 }
3525
3526                 if ( $content === null ) {
3527                         return false;
3528                 }
3529
3530                 // Reduce effects of race conditions for slow parses (bug 46014)
3531                 $cacheTime = wfTimestampNow();
3532
3533                 $time = - microtime( true );
3534                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3535                 $time += microtime( true );
3536
3537                 // Timing hack
3538                 if ( $time > 3 ) {
3539                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3540                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3541                 }
3542
3543                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3544                         ParserCache::singleton()->save(
3545                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime );
3546                 }
3547
3548                 // Make sure file cache is not used on uncacheable content.
3549                 // Output that has magic words in it can still use the parser cache
3550                 // (if enabled), though it will generally expire sooner.
3551                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3552                         $wgUseFileCache = false;
3553                 }
3554
3555                 if ( $isCurrent ) {
3556                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3557                 }
3558
3559                 return true;
3560         }
3561
3562         /**
3563          * @return bool
3564          */
3565         function getCachedWork() {
3566                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3567
3568                 if ( $this->parserOutput === false ) {
3569                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3570                         return false;
3571                 } else {
3572                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3573                         return true;
3574                 }
3575         }
3576
3577         /**
3578          * @return bool
3579          */
3580         function fallback() {
3581                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3582
3583                 if ( $this->parserOutput === false ) {
3584                         wfDebugLog( 'dirty', "dirty missing\n" );
3585                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3586                         return false;
3587                 } else {
3588                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3589                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3590                         $this->isDirty = true;
3591                         return true;
3592                 }
3593         }
3594
3595         /**
3596          * @param $status Status
3597          * @return bool
3598          */
3599         function error( $status ) {
3600                 $this->error = $status;
3601                 return false;
3602         }
3603 }