includes/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
  25  */
  26 abstract class Page {}
  27
  28 /**
  29  * Class representing a MediaWiki article and history.
  30  *
  31  * Some fields are public only for backwards-compatibility. Use accessors.
  32  * In the past, this class was part of Article.php and everything was public.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class WikiPage extends Page implements IDBAccessObject {
  37         // Constants for $mDataLoadedFrom and related
  38
  39         /**
  40          * @var Title
  41          */
  42         public $mTitle = null;
  43
  44         /**@{{
  45          * @protected
  46          */
  47         public $mDataLoaded = false;         // !< Boolean
  48         public $mIsRedirect = false;         // !< Boolean
  49         public $mLatest = false;             // !< Integer (false means "not loaded")
  50         public $mPreparedEdit = false;       // !< Array
  51         /**@}}*/
  52
  53         /**
  54          * @var int; one of the READ_* constants
  55          */
  56         protected $mDataLoadedFrom = self::READ_NONE;
  57
  58         /**
  59          * @var Title
  60          */
  61         protected $mRedirectTarget = null;
  62
  63         /**
  64          * @var Revision
  65          */
  66         protected $mLastRevision = null;
  67
  68         /**
  69          * @var string; timestamp of the current revision or empty string if not loaded
  70          */
  71         protected $mTimestamp = '';
  72
  73         /**
  74          * @var string
  75          */
  76         protected $mTouched = '19700101000000';
  77
  78         /**
  79          * @var int|null
  80          */
  81         protected $mCounter = null;
  82
  83         /**
  84          * Constructor and clear the article
  85          * @param $title Title Reference to a Title object.
  86          */
  87         public function __construct( Title $title ) {
  88                 $this->mTitle = $title;
  89         }
  90
  91         /**
  92          * Create a WikiPage object of the appropriate class for the given title.
  93          *
  94          * @param $title Title
  95          * @throws MWException
  96          * @return WikiPage object of the appropriate type
  97          */
  98         public static function factory( Title $title ) {
  99                 $ns = $title->getNamespace();
 100
 101                 if ( $ns == NS_MEDIA ) {
 102                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 103                 } elseif ( $ns < 0 ) {
 104                         throw new MWException( "Invalid or virtual namespace $ns given." );
 105                 }
 106
 107                 switch ( $ns ) {
 108                         case NS_FILE:
 109                                 $page = new WikiFilePage( $title );
 110                                 break;
 111                         case NS_CATEGORY:
 112                                 $page = new WikiCategoryPage( $title );
 113                                 break;
 114                         default:
 115                                 $page = new WikiPage( $title );
 116                 }
 117
 118                 return $page;
 119         }
 120
 121         /**
 122          * Constructor from a page id
 123          *
 124          * @param $id Int article ID to load
 125          * @param $from string|int one of the following values:
 126          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 127          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 128          *
 129          * @return WikiPage|null
 130          */
 131         public static function newFromID( $id, $from = 'fromdb' ) {
 132                 $from = self::convertSelectType( $from );
 133                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 134                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 135                 if ( !$row ) {
 136                         return null;
 137                 }
 138                 return self::newFromRow( $row, $from );
 139         }
 140
 141         /**
 142          * Constructor from a database row
 143          *
 144          * @since 1.20
 145          * @param $row object: database row containing at least fields returned
 146          *        by selectFields().
 147          * @param $from string|int: source of $data:
 148          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 150          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 151          * @return WikiPage
 152          */
 153         public static function newFromRow( $row, $from = 'fromdb' ) {
 154                 $page = self::factory( Title::newFromRow( $row ) );
 155                 $page->loadFromRow( $row, $from );
 156                 return $page;
 157         }
 158
 159         /**
 160          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 161          *
 162          * @param $type object|string|int
 163          * @return mixed
 164          */
 165         private static function convertSelectType( $type ) {
 166                 switch ( $type ) {
 167                 case 'fromdb':
 168                         return self::READ_NORMAL;
 169                 case 'fromdbmaster':
 170                         return self::READ_LATEST;
 171                 case 'forupdate':
 172                         return self::READ_LOCKING;
 173                 default:
 174                         // It may already be an integer or whatever else
 175                         return $type;
 176                 }
 177         }
 178
 179         /**
 180          * Returns overrides for action handlers.
 181          * Classes listed here will be used instead of the default one when
 182          * (and only when) $wgActions[$action] === true. This allows subclasses
 183          * to override the default behavior.
 184          *
 185          * @todo: move this UI stuff somewhere else
 186          *
 187          * @return Array
 188          */
 189         public function getActionOverrides() {
 190                 return array();
 191         }
 192
 193         /**
 194          * Get the title object of the article
 195          * @return Title object of this page
 196          */
 197         public function getTitle() {
 198                 return $this->mTitle;
 199         }
 200
 201         /**
 202          * Clear the object
 203          * @return void
 204          */
 205         public function clear() {
 206                 $this->mDataLoaded = false;
 207                 $this->mDataLoadedFrom = self::READ_NONE;
 208
 209                 $this->clearCacheFields();
 210         }
 211
 212         /**
 213          * Clear the object cache fields
 214          * @return void
 215          */
 216         protected function clearCacheFields() {
 217                 $this->mCounter = null;
 218                 $this->mRedirectTarget = null; # Title object if set
 219                 $this->mLastRevision = null; # Latest revision
 220                 $this->mTouched = '19700101000000';
 221                 $this->mTimestamp = '';
 222                 $this->mIsRedirect = false;
 223                 $this->mLatest = false;
 224                 $this->mPreparedEdit = false;
 225         }
 226
 227         /**
 228          * Return the list of revision fields that should be selected to create
 229          * a new page.
 230          *
 231          * @return array
 232          */
 233         public static function selectFields() {
 234                 return array(
 235                         'page_id',
 236                         'page_namespace',
 237                         'page_title',
 238                         'page_restrictions',
 239                         'page_counter',
 240                         'page_is_redirect',
 241                         'page_is_new',
 242                         'page_random',
 243                         'page_touched',
 244                         'page_latest',
 245                         'page_len',
 246                 );
 247         }
 248
 249         /**
 250          * Fetch a page record with the given conditions
 251          * @param $dbr DatabaseBase object
 252          * @param $conditions Array
 253          * @param $options Array
 254          * @return mixed Database result resource, or false on failure
 255          */
 256         protected function pageData( $dbr, $conditions, $options = array() ) {
 257                 $fields = self::selectFields();
 258
 259                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 260
 261                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 262
 263                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 264
 265                 return $row;
 266         }
 267
 268         /**
 269          * Fetch a page record matching the Title object's namespace and title
 270          * using a sanitized title string
 271          *
 272          * @param $dbr DatabaseBase object
 273          * @param $title Title object
 274          * @param $options Array
 275          * @return mixed Database result resource, or false on failure
 276          */
 277         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 278                 return $this->pageData( $dbr, array(
 279                         'page_namespace' => $title->getNamespace(),
 280                         'page_title'     => $title->getDBkey() ), $options );
 281         }
 282
 283         /**
 284          * Fetch a page record matching the requested ID
 285          *
 286          * @param $dbr DatabaseBase
 287          * @param $id Integer
 288          * @param $options Array
 289          * @return mixed Database result resource, or false on failure
 290          */
 291         public function pageDataFromId( $dbr, $id, $options = array() ) {
 292                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 293         }
 294
 295         /**
 296          * Set the general counter, title etc data loaded from
 297          * some source.
 298          *
 299          * @param $from object|string|int One of the following:
 300          *        - A DB query result object
 301          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 302          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 303          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 304          *
 305          * @return void
 306          */
 307         public function loadPageData( $from = 'fromdb' ) {
 308                 $from = self::convertSelectType( $from );
 309                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 310                         // We already have the data from the correct location, no need to load it twice.
 311                         return;
 312                 }
 313
 314                 if ( $from === self::READ_LOCKING ) {
 315                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 316                 } elseif ( $from === self::READ_LATEST ) {
 317                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 318                 } elseif ( $from === self::READ_NORMAL ) {
 319                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 320                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 321                         # Note that DB also stores the master position in the session and checks it.
 322                         $touched = $this->getCachedLastEditTime();
 323                         if ( $touched ) { // key set
 324                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 325                                         $from = self::READ_LATEST;
 326                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 327                                 }
 328                         }
 329                 } else {
 330                         // No idea from where the caller got this data, assume slave database.
 331                         $data = $from;
 332                         $from = self::READ_NORMAL;
 333                 }
 334
 335                 $this->loadFromRow( $data, $from );
 336         }
 337
 338         /**
 339          * Load the object from a database row
 340          *
 341          * @since 1.20
 342          * @param $data object: database row containing at least fields returned
 343          *        by selectFields()
 344          * @param $from string|int One of the following:
 345          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 346          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 347          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 348          *          the master DB using SELECT FOR UPDATE
 349          */
 350         public function loadFromRow( $data, $from ) {
 351                 $lc = LinkCache::singleton();
 352
 353                 if ( $data ) {
 354                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 355
 356                         $this->mTitle->loadFromRow( $data );
 357
 358                         # Old-fashioned restrictions
 359                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 360
 361                         $this->mCounter     = intval( $data->page_counter );
 362                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 363                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 364                         $this->mLatest      = intval( $data->page_latest );
 365                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 366                         // Double-check the ID of any cached latest Revision object for consistency.
 367                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 368                                 $this->mLastRevision = null;
 369                                 $this->mTimestamp = '';
 370                         }
 371                 } else {
 372                         $lc->addBadLinkObj( $this->mTitle );
 373
 374                         $this->mTitle->loadFromRow( false );
 375
 376                         $this->clearCacheFields();
 377                 }
 378
 379                 $this->mDataLoaded = true;
 380                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 381         }
 382
 383         /**
 384          * @return int Page ID
 385          */
 386         public function getId() {
 387                 return $this->mTitle->getArticleID();
 388         }
 389
 390         /**
 391          * @return bool Whether or not the page exists in the database
 392          */
 393         public function exists() {
 394                 return $this->mTitle->exists();
 395         }
 396
 397         /**
 398          * Check if this page is something we're going to be showing
 399          * some sort of sensible content for. If we return false, page
 400          * views (plain action=view) will return an HTTP 404 response,
 401          * so spiders and robots can know they're following a bad link.
 402          *
 403          * @return bool
 404          */
 405         public function hasViewableContent() {
 406                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 407         }
 408
 409         /**
 410          * @return int The view count for the page
 411          */
 412         public function getCount() {
 413                 if ( !$this->mDataLoaded ) {
 414                         $this->loadPageData();
 415                 }
 416
 417                 return $this->mCounter;
 418         }
 419
 420         /**
 421          * Tests if the article text represents a redirect
 422          *
 423          * @param $text mixed string containing article contents, or boolean
 424          * @return bool
 425          */
 426         public function isRedirect( $text = false ) {
 427                 if ( $text === false ) {
 428                         if ( !$this->mDataLoaded ) {
 429                                 $this->loadPageData();
 430                         }
 431
 432                         return (bool)$this->mIsRedirect;
 433                 } else {
 434                         return Title::newFromRedirect( $text ) !== null;
 435                 }
 436         }
 437
 438         /**
 439          * Loads page_touched and returns a value indicating if it should be used
 440          * @return boolean true if not a redirect
 441          */
 442         public function checkTouched() {
 443                 if ( !$this->mDataLoaded ) {
 444                         $this->loadPageData();
 445                 }
 446                 return !$this->mIsRedirect;
 447         }
 448
 449         /**
 450          * Get the page_touched field
 451          * @return string containing GMT timestamp
 452          */
 453         public function getTouched() {
 454                 if ( !$this->mDataLoaded ) {
 455                         $this->loadPageData();
 456                 }
 457                 return $this->mTouched;
 458         }
 459
 460         /**
 461          * Get the page_latest field
 462          * @return integer rev_id of current revision
 463          */
 464         public function getLatest() {
 465                 if ( !$this->mDataLoaded ) {
 466                         $this->loadPageData();
 467                 }
 468                 return (int)$this->mLatest;
 469         }
 470
 471         /**
 472          * Get the Revision object of the oldest revision
 473          * @return Revision|null
 474          */
 475         public function getOldestRevision() {
 476                 wfProfileIn( __METHOD__ );
 477
 478                 // Try using the slave database first, then try the master
 479                 $continue = 2;
 480                 $db = wfGetDB( DB_SLAVE );
 481                 $revSelectFields = Revision::selectFields();
 482
 483                 while ( $continue ) {
 484                         $row = $db->selectRow(
 485                                 array( 'page', 'revision' ),
 486                                 $revSelectFields,
 487                                 array(
 488                                         'page_namespace' => $this->mTitle->getNamespace(),
 489                                         'page_title' => $this->mTitle->getDBkey(),
 490                                         'rev_page = page_id'
 491                                 ),
 492                                 __METHOD__,
 493                                 array(
 494                                         'ORDER BY' => 'rev_timestamp ASC'
 495                                 )
 496                         );
 497
 498                         if ( $row ) {
 499                                 $continue = 0;
 500                         } else {
 501                                 $db = wfGetDB( DB_MASTER );
 502                                 $continue--;
 503                         }
 504                 }
 505
 506                 wfProfileOut( __METHOD__ );
 507                 return $row ? Revision::newFromRow( $row ) : null;
 508         }
 509
 510         /**
 511          * Loads everything except the text
 512          * This isn't necessary for all uses, so it's only done if needed.
 513          */
 514         protected function loadLastEdit() {
 515                 if ( $this->mLastRevision !== null ) {
 516                         return; // already loaded
 517                 }
 518
 519                 $latest = $this->getLatest();
 520                 if ( !$latest ) {
 521                         return; // page doesn't exist or is missing page_latest info
 522                 }
 523
 524                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 525                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 526                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 527                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 528                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 529                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 530                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 531                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 532                 if ( $revision ) { // sanity
 533                         $this->setLastEdit( $revision );
 534                 }
 535         }
 536
 537         /**
 538          * Set the latest revision
 539          */
 540         protected function setLastEdit( Revision $revision ) {
 541                 $this->mLastRevision = $revision;
 542                 $this->mTimestamp = $revision->getTimestamp();
 543         }
 544
 545         /**
 546          * Get the latest revision
 547          * @return Revision|null
 548          */
 549         public function getRevision() {
 550                 $this->loadLastEdit();
 551                 if ( $this->mLastRevision ) {
 552                         return $this->mLastRevision;
 553                 }
 554                 return null;
 555         }
 556
 557         /**
 558          * Get the text of the current revision. No side-effects...
 559          *
 560          * @param $audience Integer: one of:
 561          *      Revision::FOR_PUBLIC       to be displayed to all users
 562          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 563          *      Revision::RAW              get the text regardless of permissions
 564          * @return String|bool The text of the current revision. False on failure
 565          */
 566         public function getText( $audience = Revision::FOR_PUBLIC ) {
 567                 $this->loadLastEdit();
 568                 if ( $this->mLastRevision ) {
 569                         return $this->mLastRevision->getText( $audience );
 570                 }
 571                 return false;
 572         }
 573
 574         /**
 575          * Get the text of the current revision. No side-effects...
 576          *
 577          * @return String|bool The text of the current revision. False on failure
 578          */
 579         public function getRawText() {
 580                 $this->loadLastEdit();
 581                 if ( $this->mLastRevision ) {
 582                         return $this->mLastRevision->getRawText();
 583                 }
 584                 return false;
 585         }
 586
 587         /**
 588          * @return string MW timestamp of last article revision
 589          */
 590         public function getTimestamp() {
 591                 // Check if the field has been filled by WikiPage::setTimestamp()
 592                 if ( !$this->mTimestamp ) {
 593                         $this->loadLastEdit();
 594                 }
 595
 596                 return wfTimestamp( TS_MW, $this->mTimestamp );
 597         }
 598
 599         /**
 600          * Set the page timestamp (use only to avoid DB queries)
 601          * @param $ts string MW timestamp of last article revision
 602          * @return void
 603          */
 604         public function setTimestamp( $ts ) {
 605                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 606         }
 607
 608         /**
 609          * @param $audience Integer: one of:
 610          *      Revision::FOR_PUBLIC       to be displayed to all users
 611          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 612          *      Revision::RAW              get the text regardless of permissions
 613          * @return int user ID for the user that made the last article revision
 614          */
 615         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 616                 $this->loadLastEdit();
 617                 if ( $this->mLastRevision ) {
 618                         return $this->mLastRevision->getUser( $audience );
 619                 } else {
 620                         return -1;
 621                 }
 622         }
 623
 624         /**
 625          * Get the User object of the user who created the page
 626          * @param $audience Integer: one of:
 627          *      Revision::FOR_PUBLIC       to be displayed to all users
 628          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 629          *      Revision::RAW              get the text regardless of permissions
 630          * @return User|null
 631          */
 632         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 633                 $revision = $this->getOldestRevision();
 634                 if ( $revision ) {
 635                         $userName = $revision->getUserText( $audience );
 636                         return User::newFromName( $userName, false );
 637                 } else {
 638                         return null;
 639                 }
 640         }
 641
 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 $wgUser
 646          *      Revision::RAW              get the text regardless of permissions
 647          * @return string username of the user that made the last article revision
 648          */
 649         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 650                 $this->loadLastEdit();
 651                 if ( $this->mLastRevision ) {
 652                         return $this->mLastRevision->getUserText( $audience );
 653                 } else {
 654                         return '';
 655                 }
 656         }
 657
 658         /**
 659          * @param $audience Integer: one of:
 660          *      Revision::FOR_PUBLIC       to be displayed to all users
 661          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 662          *      Revision::RAW              get the text regardless of permissions
 663          * @return string Comment stored for the last article revision
 664          */
 665         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 666                 $this->loadLastEdit();
 667                 if ( $this->mLastRevision ) {
 668                         return $this->mLastRevision->getComment( $audience );
 669                 } else {
 670                         return '';
 671                 }
 672         }
 673
 674         /**
 675          * Returns true if last revision was marked as "minor edit"
 676          *
 677          * @return boolean Minor edit indicator for the last article revision.
 678          */
 679         public function getMinorEdit() {
 680                 $this->loadLastEdit();
 681                 if ( $this->mLastRevision ) {
 682                         return $this->mLastRevision->isMinor();
 683                 } else {
 684                         return false;
 685                 }
 686         }
 687
 688         /**
 689          * Get the cached timestamp for the last time the page changed.
 690          * This is only used to help handle slave lag by comparing to page_touched.
 691          * @return string MW timestamp
 692          */
 693         protected function getCachedLastEditTime() {
 694                 global $wgMemc;
 695                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 696                 return $wgMemc->get( $key );
 697         }
 698
 699         /**
 700          * Set the cached timestamp for the last time the page changed.
 701          * This is only used to help handle slave lag by comparing to page_touched.
 702          * @param $timestamp string
 703          * @return void
 704          */
 705         public function setCachedLastEditTime( $timestamp ) {
 706                 global $wgMemc;
 707                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 708                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 709         }
 710
 711         /**
 712          * Determine whether a page would be suitable for being counted as an
 713          * article in the site_stats table based on the title & its content
 714          *
 715          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 716          *        if false, the current database state will be used
 717          * @return Boolean
 718          */
 719         public function isCountable( $editInfo = false ) {
 720                 global $wgArticleCountMethod;
 721
 722                 if ( !$this->mTitle->isContentPage() ) {
 723                         return false;
 724                 }
 725
 726                 $text = $editInfo ? $editInfo->pst : false;
 727
 728                 if ( $this->isRedirect( $text ) ) {
 729                         return false;
 730                 }
 731
 732                 switch ( $wgArticleCountMethod ) {
 733                 case 'any':
 734                         return true;
 735                 case 'comma':
 736                         if ( $text === false ) {
 737                                 $text = $this->getRawText();
 738                         }
 739                         return strpos( $text,  ',' ) !== false;
 740                 case 'link':
 741                         if ( $editInfo ) {
 742                                 // ParserOutput::getLinks() is a 2D array of page links, so
 743                                 // to be really correct we would need to recurse in the array
 744                                 // but the main array should only have items in it if there are
 745                                 // links.
 746                                 return (bool)count( $editInfo->output->getLinks() );
 747                         } else {
 748                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 749                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 750                         }
 751                 }
 752         }
 753
 754         /**
 755          * If this page is a redirect, get its target
 756          *
 757          * The target will be fetched from the redirect table if possible.
 758          * If this page doesn't have an entry there, call insertRedirect()
 759          * @return Title|mixed object, or null if this page is not a redirect
 760          */
 761         public function getRedirectTarget() {
 762                 if ( !$this->mTitle->isRedirect() ) {
 763                         return null;
 764                 }
 765
 766                 if ( $this->mRedirectTarget !== null ) {
 767                         return $this->mRedirectTarget;
 768                 }
 769
 770                 # Query the redirect table
 771                 $dbr = wfGetDB( DB_SLAVE );
 772                 $row = $dbr->selectRow( 'redirect',
 773                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 774                         array( 'rd_from' => $this->getId() ),
 775                         __METHOD__
 776                 );
 777
 778                 // rd_fragment and rd_interwiki were added later, populate them if empty
 779                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 780                         return $this->mRedirectTarget = Title::makeTitle(
 781                                 $row->rd_namespace, $row->rd_title,
 782                                 $row->rd_fragment, $row->rd_interwiki );
 783                 }
 784
 785                 # This page doesn't have an entry in the redirect table
 786                 return $this->mRedirectTarget = $this->insertRedirect();
 787         }
 788
 789         /**
 790          * Insert an entry for this page into the redirect table.
 791          *
 792          * Don't call this function directly unless you know what you're doing.
 793          * @return Title object or null if not a redirect
 794          */
 795         public function insertRedirect() {
 796                 // recurse through to only get the final target
 797                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 798                 if ( !$retval ) {
 799                         return null;
 800                 }
 801                 $this->insertRedirectEntry( $retval );
 802                 return $retval;
 803         }
 804
 805         /**
 806          * Insert or update the redirect table entry for this page to indicate
 807          * it redirects to $rt .
 808          * @param $rt Title redirect target
 809          */
 810         public function insertRedirectEntry( $rt ) {
 811                 $dbw = wfGetDB( DB_MASTER );
 812                 $dbw->replace( 'redirect', array( 'rd_from' ),
 813                         array(
 814                                 'rd_from'      => $this->getId(),
 815                                 'rd_namespace' => $rt->getNamespace(),
 816                                 'rd_title'     => $rt->getDBkey(),
 817                                 'rd_fragment'  => $rt->getFragment(),
 818                                 'rd_interwiki' => $rt->getInterwiki(),
 819                         ),
 820                         __METHOD__
 821                 );
 822         }
 823
 824         /**
 825          * Get the Title object or URL this page redirects to
 826          *
 827          * @return mixed false, Title of in-wiki target, or string with URL
 828          */
 829         public function followRedirect() {
 830                 return $this->getRedirectURL( $this->getRedirectTarget() );
 831         }
 832
 833         /**
 834          * Get the Title object or URL to use for a redirect. We use Title
 835          * objects for same-wiki, non-special redirects and URLs for everything
 836          * else.
 837          * @param $rt Title Redirect target
 838          * @return mixed false, Title object of local target, or string with URL
 839          */
 840         public function getRedirectURL( $rt ) {
 841                 if ( !$rt ) {
 842                         return false;
 843                 }
 844
 845                 if ( $rt->isExternal() ) {
 846                         if ( $rt->isLocal() ) {
 847                                 // Offsite wikis need an HTTP redirect.
 848                                 //
 849                                 // This can be hard to reverse and may produce loops,
 850                                 // so they may be disabled in the site configuration.
 851                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 852                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 853                         } else {
 854                                 // External pages pages without "local" bit set are not valid
 855                                 // redirect targets
 856                                 return false;
 857                         }
 858                 }
 859
 860                 if ( $rt->isSpecialPage() ) {
 861                         // Gotta handle redirects to special pages differently:
 862                         // Fill the HTTP response "Location" header and ignore
 863                         // the rest of the page we're on.
 864                         //
 865                         // Some pages are not valid targets
 866                         if ( $rt->isValidRedirectTarget() ) {
 867                                 return $rt->getFullURL();
 868                         } else {
 869                                 return false;
 870                         }
 871                 }
 872
 873                 return $rt;
 874         }
 875
 876         /**
 877          * Get a list of users who have edited this article, not including the user who made
 878          * the most recent revision, which you can get from $article->getUser() if you want it
 879          * @return UserArrayFromResult
 880          */
 881         public function getContributors() {
 882                 # @todo FIXME: This is expensive; cache this info somewhere.
 883
 884                 $dbr = wfGetDB( DB_SLAVE );
 885
 886                 if ( $dbr->implicitGroupby() ) {
 887                         $realNameField = 'user_real_name';
 888                 } else {
 889                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 890                 }
 891
 892                 $tables = array( 'revision', 'user' );
 893
 894                 $fields = array(
 895                         'user_id' => 'rev_user',
 896                         'user_name' => 'rev_user_text',
 897                         $realNameField,
 898                         'timestamp' => 'MAX(rev_timestamp)',
 899                 );
 900
 901                 $conds = array( 'rev_page' => $this->getId() );
 902
 903                 // The user who made the top revision gets credited as "this page was last edited by
 904                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 905                 $user = $this->getUser();
 906                 if ( $user ) {
 907                         $conds[] = "rev_user != $user";
 908                 } else {
 909                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 910                 }
 911
 912                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 913
 914                 $jconds = array(
 915                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 916                 );
 917
 918                 $options = array(
 919                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 920                         'ORDER BY' => 'timestamp DESC',
 921                 );
 922
 923                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 924                 return new UserArrayFromResult( $res );
 925         }
 926
 927         /**
 928          * Get the last N authors
 929          * @param $num Integer: number of revisions to get
 930          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 931          * @return array Array of authors, duplicates not removed
 932          */
 933         public function getLastNAuthors( $num, $revLatest = 0 ) {
 934                 wfProfileIn( __METHOD__ );
 935                 // First try the slave
 936                 // If that doesn't have the latest revision, try the master
 937                 $continue = 2;
 938                 $db = wfGetDB( DB_SLAVE );
 939
 940                 do {
 941                         $res = $db->select( array( 'page', 'revision' ),
 942                                 array( 'rev_id', 'rev_user_text' ),
 943                                 array(
 944                                         'page_namespace' => $this->mTitle->getNamespace(),
 945                                         'page_title' => $this->mTitle->getDBkey(),
 946                                         'rev_page = page_id'
 947                                 ), __METHOD__,
 948                                 array(
 949                                         'ORDER BY' => 'rev_timestamp DESC',
 950                                         'LIMIT' => $num
 951                                 )
 952                         );
 953
 954                         if ( !$res ) {
 955                                 wfProfileOut( __METHOD__ );
 956                                 return array();
 957                         }
 958
 959                         $row = $db->fetchObject( $res );
 960
 961                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
 962                                 $db = wfGetDB( DB_MASTER );
 963                                 $continue--;
 964                         } else {
 965                                 $continue = 0;
 966                         }
 967                 } while ( $continue );
 968
 969                 $authors = array( $row->rev_user_text );
 970
 971                 foreach ( $res as $row ) {
 972                         $authors[] = $row->rev_user_text;
 973                 }
 974
 975                 wfProfileOut( __METHOD__ );
 976                 return $authors;
 977         }
 978
 979         /**
 980          * Should the parser cache be used?
 981          *
 982          * @param $parserOptions ParserOptions to check
 983          * @param $oldid int
 984          * @return boolean
 985          */
 986         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
 987                 global $wgEnableParserCache;
 988
 989                 return $wgEnableParserCache
 990                         && $parserOptions->getStubThreshold() == 0
 991                         && $this->mTitle->exists()
 992                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
 993                         && $this->mTitle->isWikitextPage();
 994         }
 995
 996         /**
 997          * Get a ParserOutput for the given ParserOptions and revision ID.
 998          * The parser cache will be used if possible.
 999          *
1000          * @since 1.19
1001          * @param $parserOptions ParserOptions to use for the parse operation
1002          * @param $oldid Revision ID to get the text from, passing null or 0 will
1003          *               get the current revision (default value)
1004          * @return ParserOutput or false if the revision was not found
1005          */
1006         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1007                 wfProfileIn( __METHOD__ );
1008
1009                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1010                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1011                 if ( $parserOptions->getStubThreshold() ) {
1012                         wfIncrStats( 'pcache_miss_stub' );
1013                 }
1014
1015                 if ( $useParserCache ) {
1016                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1017                         if ( $parserOutput !== false ) {
1018                                 wfProfileOut( __METHOD__ );
1019                                 return $parserOutput;
1020                         }
1021                 }
1022
1023                 if ( $oldid === null || $oldid === 0 ) {
1024                         $oldid = $this->getLatest();
1025                 }
1026
1027                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1028                 $pool->execute();
1029
1030                 wfProfileOut( __METHOD__ );
1031
1032                 return $pool->getParserOutput();
1033         }
1034
1035         /**
1036          * Do standard deferred updates after page view
1037          * @param $user User The relevant user
1038          */
1039         public function doViewUpdates( User $user ) {
1040                 global $wgDisableCounters;
1041                 if ( wfReadOnly() ) {
1042                         return;
1043                 }
1044
1045                 # Don't update page view counters on views from bot users (bug 14044)
1046                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1047                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1048                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1049                 }
1050
1051                 # Update newtalk / watchlist notification status
1052                 $user->clearNotification( $this->mTitle );
1053         }
1054
1055         /**
1056          * Perform the actions of a page purging
1057          * @return bool
1058          */
1059         public function doPurge() {
1060                 global $wgUseSquid;
1061
1062                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1063                         return false;
1064                 }
1065
1066                 // Invalidate the cache
1067                 $this->mTitle->invalidateCache();
1068                 $this->clear();
1069
1070                 if ( $wgUseSquid ) {
1071                         // Commit the transaction before the purge is sent
1072                         $dbw = wfGetDB( DB_MASTER );
1073                         $dbw->commit( __METHOD__ );
1074
1075                         // Send purge
1076                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1077                         $update->doUpdate();
1078                 }
1079
1080                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1081                         if ( $this->mTitle->exists() ) {
1082                                 $text = $this->getRawText();
1083                         } else {
1084                                 $text = false;
1085                         }
1086
1087                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1088                 }
1089                 return true;
1090         }
1091
1092         /**
1093          * Insert a new empty page record for this article.
1094          * This *must* be followed up by creating a revision
1095          * and running $this->updateRevisionOn( ... );
1096          * or else the record will be left in a funky state.
1097          * Best if all done inside a transaction.
1098          *
1099          * @param $dbw DatabaseBase
1100          * @return int The newly created page_id key, or false if the title already existed
1101          */
1102         public function insertOn( $dbw ) {
1103                 wfProfileIn( __METHOD__ );
1104
1105                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1106                 $dbw->insert( 'page', array(
1107                         'page_id'           => $page_id,
1108                         'page_namespace'    => $this->mTitle->getNamespace(),
1109                         'page_title'        => $this->mTitle->getDBkey(),
1110                         'page_counter'      => 0,
1111                         'page_restrictions' => '',
1112                         'page_is_redirect'  => 0, # Will set this shortly...
1113                         'page_is_new'       => 1,
1114                         'page_random'       => wfRandom(),
1115                         'page_touched'      => $dbw->timestamp(),
1116                         'page_latest'       => 0, # Fill this in shortly...
1117                         'page_len'          => 0, # Fill this in shortly...
1118                 ), __METHOD__, 'IGNORE' );
1119
1120                 $affected = $dbw->affectedRows();
1121
1122                 if ( $affected ) {
1123                         $newid = $dbw->insertId();
1124                         $this->mTitle->resetArticleID( $newid );
1125                 }
1126                 wfProfileOut( __METHOD__ );
1127
1128                 return $affected ? $newid : false;
1129         }
1130
1131         /**
1132          * Update the page record to point to a newly saved revision.
1133          *
1134          * @param $dbw DatabaseBase: object
1135          * @param $revision Revision: For ID number, and text used to set
1136          *                  length and redirect status fields
1137          * @param $lastRevision Integer: if given, will not overwrite the page field
1138          *                      when different from the currently set value.
1139          *                      Giving 0 indicates the new page flag should be set
1140          *                      on.
1141          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1142          *                           removing rows in redirect table.
1143          * @return bool true on success, false on failure
1144          * @private
1145          */
1146         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1147                 wfProfileIn( __METHOD__ );
1148
1149                 $text = $revision->getText();
1150                 $len = strlen( $text );
1151                 $rt = Title::newFromRedirectRecurse( $text );
1152
1153                 $conditions = array( 'page_id' => $this->getId() );
1154
1155                 if ( !is_null( $lastRevision ) ) {
1156                         # An extra check against threads stepping on each other
1157                         $conditions['page_latest'] = $lastRevision;
1158                 }
1159
1160                 $now = wfTimestampNow();
1161                 $dbw->update( 'page',
1162                         array( /* SET */
1163                                 'page_latest'      => $revision->getId(),
1164                                 'page_touched'     => $dbw->timestamp( $now ),
1165                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1166                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1167                                 'page_len'         => $len,
1168                         ),
1169                         $conditions,
1170                         __METHOD__ );
1171
1172                 $result = $dbw->affectedRows() > 0;
1173                 if ( $result ) {
1174                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1175                         $this->setLastEdit( $revision );
1176                         $this->setCachedLastEditTime( $now );
1177                         $this->mLatest = $revision->getId();
1178                         $this->mIsRedirect = (bool)$rt;
1179                         # Update the LinkCache.
1180                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1181                 }
1182
1183                 wfProfileOut( __METHOD__ );
1184                 return $result;
1185         }
1186
1187         /**
1188          * Add row to the redirect table if this is a redirect, remove otherwise.
1189          *
1190          * @param $dbw DatabaseBase
1191          * @param $redirectTitle Title object pointing to the redirect target,
1192          *                       or NULL if this is not a redirect
1193          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1194          *                           removing rows in redirect table.
1195          * @return bool true on success, false on failure
1196          * @private
1197          */
1198         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1199                 // Always update redirects (target link might have changed)
1200                 // Update/Insert if we don't know if the last revision was a redirect or not
1201                 // Delete if changing from redirect to non-redirect
1202                 $isRedirect = !is_null( $redirectTitle );
1203
1204                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1205                         return true;
1206                 }
1207
1208                 wfProfileIn( __METHOD__ );
1209                 if ( $isRedirect ) {
1210                         $this->insertRedirectEntry( $redirectTitle );
1211                 } else {
1212                         // This is not a redirect, remove row from redirect table
1213                         $where = array( 'rd_from' => $this->getId() );
1214                         $dbw->delete( 'redirect', $where, __METHOD__ );
1215                 }
1216
1217                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1218                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1219                 }
1220                 wfProfileOut( __METHOD__ );
1221
1222                 return ( $dbw->affectedRows() != 0 );
1223         }
1224
1225         /**
1226          * If the given revision is newer than the currently set page_latest,
1227          * update the page record. Otherwise, do nothing.
1228          *
1229          * @param $dbw DatabaseBase object
1230          * @param $revision Revision object
1231          * @return mixed
1232          */
1233         public function updateIfNewerOn( $dbw, $revision ) {
1234                 wfProfileIn( __METHOD__ );
1235
1236                 $row = $dbw->selectRow(
1237                         array( 'revision', 'page' ),
1238                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1239                         array(
1240                                 'page_id' => $this->getId(),
1241                                 'page_latest=rev_id' ),
1242                         __METHOD__ );
1243
1244                 if ( $row ) {
1245                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1246                                 wfProfileOut( __METHOD__ );
1247                                 return false;
1248                         }
1249                         $prev = $row->rev_id;
1250                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1251                 } else {
1252                         # No or missing previous revision; mark the page as new
1253                         $prev = 0;
1254                         $lastRevIsRedirect = null;
1255                 }
1256
1257                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1258
1259                 wfProfileOut( __METHOD__ );
1260                 return $ret;
1261         }
1262
1263         /**
1264          * Get the text that needs to be saved in order to undo all revisions
1265          * between $undo and $undoafter. Revisions must belong to the same page,
1266          * must exist and must not be deleted
1267          * @param $undo Revision
1268          * @param $undoafter Revision Must be an earlier revision than $undo
1269          * @return mixed string on success, false on failure
1270          */
1271         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1272                 $cur_text = $this->getRawText();
1273                 if ( $cur_text === false ) {
1274                         return false; // no page
1275                 }
1276                 $undo_text = $undo->getText();
1277                 $undoafter_text = $undoafter->getText();
1278
1279                 if ( $cur_text == $undo_text ) {
1280                         # No use doing a merge if it's just a straight revert.
1281                         return $undoafter_text;
1282                 }
1283
1284                 $undone_text = '';
1285
1286                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
1287                         return false;
1288                 }
1289
1290                 return $undone_text;
1291         }
1292
1293         /**
1294          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1295          * @param $text String: new text of the section
1296          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1297          * @param $edittime String: revision timestamp or null to use the current revision
1298          * @return string Complete article text, or null if error
1299          */
1300         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1301                 wfProfileIn( __METHOD__ );
1302
1303                 if ( strval( $section ) == '' ) {
1304                         // Whole-page edit; let the whole text through
1305                 } else {
1306                         // Bug 30711: always use current version when adding a new section
1307                         if ( is_null( $edittime ) || $section == 'new' ) {
1308                                 $oldtext = $this->getRawText();
1309                                 if ( $oldtext === false ) {
1310                                         wfDebug( __METHOD__ . ": no page text\n" );
1311                                         wfProfileOut( __METHOD__ );
1312                                         return null;
1313                                 }
1314                         } else {
1315                                 $dbw = wfGetDB( DB_MASTER );
1316                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1317
1318                                 if ( !$rev ) {
1319                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1320                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1321                                         wfProfileOut( __METHOD__ );
1322                                         return null;
1323                                 }
1324
1325                                 $oldtext = $rev->getText();
1326                         }
1327
1328                         if ( $section == 'new' ) {
1329                                 # Inserting a new section
1330                                 $subject = $sectionTitle ? wfMessage( 'newsectionheaderdefaultlevel' )
1331                                         ->rawParams( $sectionTitle )->inContentLanguage()->text() . "\n\n" : '';
1332                                 if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
1333                                         $text = strlen( trim( $oldtext ) ) > 0
1334                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1335                                                 : "{$subject}{$text}";
1336                                 }
1337                         } else {
1338                                 # Replacing an existing section; roll out the big guns
1339                                 global $wgParser;
1340
1341                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1342                         }
1343                 }
1344
1345                 wfProfileOut( __METHOD__ );
1346                 return $text;
1347         }
1348
1349         /**
1350          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1351          * @param $flags Int
1352          * @return Int updated $flags
1353          */
1354         function checkFlags( $flags ) {
1355                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1356                         if ( $this->mTitle->getArticleID() ) {
1357                                 $flags |= EDIT_UPDATE;
1358                         } else {
1359                                 $flags |= EDIT_NEW;
1360                         }
1361                 }
1362
1363                 return $flags;
1364         }
1365
1366         /**
1367          * Change an existing article or create a new article. Updates RC and all necessary caches,
1368          * optionally via the deferred update array.
1369          *
1370          * @param $text String: new text
1371          * @param $summary String: edit summary
1372          * @param $flags Integer bitfield:
1373          *      EDIT_NEW
1374          *          Article is known or assumed to be non-existent, create a new one
1375          *      EDIT_UPDATE
1376          *          Article is known or assumed to be pre-existing, update it
1377          *      EDIT_MINOR
1378          *          Mark this edit minor, if the user is allowed to do so
1379          *      EDIT_SUPPRESS_RC
1380          *          Do not log the change in recentchanges
1381          *      EDIT_FORCE_BOT
1382          *          Mark the edit a "bot" edit regardless of user rights
1383          *      EDIT_DEFER_UPDATES
1384          *          Defer some of the updates until the end of index.php
1385          *      EDIT_AUTOSUMMARY
1386          *          Fill in blank summaries with generated text where possible
1387          *
1388          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1389          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1390          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1391          * edit-already-exists error will be returned. These two conditions are also possible with
1392          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1393          *
1394          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1395          * @param $user User the user doing the edit
1396          *
1397          * @throws MWException
1398          * @return Status object. Possible errors:
1399          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1400          *     edit-gone-missing:       In update mode, but the article didn't exist
1401          *     edit-conflict:           In update mode, the article changed unexpectedly
1402          *     edit-no-change:          Warning that the text was the same as before
1403          *     edit-already-exists:     In creation mode, but the article already exists
1404          *
1405          *  Extensions may define additional errors.
1406          *
1407          *  $return->value will contain an associative array with members as follows:
1408          *     new:                     Boolean indicating if the function attempted to create a new article
1409          *     revision:                The revision object for the inserted revision, or null
1410          *
1411          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1412          */
1413         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1414                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1415
1416                 # Low-level sanity check
1417                 if ( $this->mTitle->getText() === '' ) {
1418                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1419                 }
1420
1421                 wfProfileIn( __METHOD__ );
1422
1423                 $user = is_null( $user ) ? $wgUser : $user;
1424                 $status = Status::newGood( array() );
1425
1426                 // Load the data from the master database if needed.
1427                 // The caller may already loaded it from the master or even loaded it using
1428                 // SELECT FOR UPDATE, so do not override that using clear().
1429                 $this->loadPageData( 'fromdbmaster' );
1430
1431                 $flags = $this->checkFlags( $flags );
1432
1433                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1434                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1435                 {
1436                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1437
1438                         if ( $status->isOK() ) {
1439                                 $status->fatal( 'edit-hook-aborted' );
1440                         }
1441
1442                         wfProfileOut( __METHOD__ );
1443                         return $status;
1444                 }
1445
1446                 # Silently ignore EDIT_MINOR if not allowed
1447                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1448                 $bot = $flags & EDIT_FORCE_BOT;
1449
1450                 $oldtext = $this->getRawText(); // current revision
1451                 $oldsize = strlen( $oldtext );
1452                 $oldid = $this->getLatest();
1453                 $oldIsRedirect = $this->isRedirect();
1454                 $oldcountable = $this->isCountable();
1455
1456                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1457                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1458                         $summary = self::getAutosummary( $oldtext, $text, $flags );
1459                 }
1460
1461                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1462                 $text = $editInfo->pst;
1463                 $newsize = strlen( $text );
1464
1465                 $dbw = wfGetDB( DB_MASTER );
1466                 $now = wfTimestampNow();
1467                 $this->mTimestamp = $now;
1468
1469                 if ( $flags & EDIT_UPDATE ) {
1470                         # Update article, but only if changed.
1471                         $status->value['new'] = false;
1472
1473                         if ( !$oldid ) {
1474                                 # Article gone missing
1475                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1476                                 $status->fatal( 'edit-gone-missing' );
1477
1478                                 wfProfileOut( __METHOD__ );
1479                                 return $status;
1480                         } elseif ( $oldtext === false ) {
1481                                 # Sanity check for bug 37225
1482                                 wfProfileOut( __METHOD__ );
1483                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1484                         }
1485
1486                         $revision = new Revision( array(
1487                                 'page'       => $this->getId(),
1488                                 'comment'    => $summary,
1489                                 'minor_edit' => $isminor,
1490                                 'text'       => $text,
1491                                 'parent_id'  => $oldid,
1492                                 'user'       => $user->getId(),
1493                                 'user_text'  => $user->getName(),
1494                                 'timestamp'  => $now
1495                         ) );
1496                         # Bug 37225: use accessor to get the text as Revision may trim it.
1497                         # After trimming, the text may be a duplicate of the current text.
1498                         $text = $revision->getText(); // sanity; EditPage should trim already
1499
1500                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1501
1502                         if ( $changed ) {
1503                                 $dbw->begin( __METHOD__ );
1504                                 $revisionId = $revision->insertOn( $dbw );
1505
1506                                 # Update page
1507                                 #
1508                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1509                                 # during the course of this function. This makes sure that EditPage can detect
1510                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1511                                 # before this function is called. A previous function used a separate query, this
1512                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1513                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1514
1515                                 if ( !$ok ) {
1516                                         # Belated edit conflict! Run away!!
1517                                         $status->fatal( 'edit-conflict' );
1518
1519                                         $dbw->rollback( __METHOD__ );
1520
1521                                         wfProfileOut( __METHOD__ );
1522                                         return $status;
1523                                 }
1524
1525                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1526                                 # Update recentchanges
1527                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1528                                         # Mark as patrolled if the user can do so
1529                                         $patrolled = $wgUseRCPatrol && !count(
1530                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1531                                         # Add RC row to the DB
1532                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1533                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1534                                                 $revisionId, $patrolled
1535                                         );
1536
1537                                         # Log auto-patrolled edits
1538                                         if ( $patrolled ) {
1539                                                 PatrolLog::record( $rc, true, $user );
1540                                         }
1541                                 }
1542                                 $user->incEditCount();
1543                                 $dbw->commit( __METHOD__ );
1544                         } else {
1545                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1546                                 // related variables correctly
1547                                 $revision->setId( $this->getLatest() );
1548                         }
1549
1550                         # Update links tables, site stats, etc.
1551                         $this->doEditUpdates( $revision, $user, array( 'changed' => $changed,
1552                                 'oldcountable' => $oldcountable ) );
1553
1554                         if ( !$changed ) {
1555                                 $status->warning( 'edit-no-change' );
1556                                 $revision = null;
1557                                 // Update page_touched, this is usually implicit in the page update
1558                                 // Other cache updates are done in onArticleEdit()
1559                                 $this->mTitle->invalidateCache();
1560                         }
1561                 } else {
1562                         # Create new article
1563                         $status->value['new'] = true;
1564
1565                         $dbw->begin( __METHOD__ );
1566
1567                         # Add the page record; stake our claim on this title!
1568                         # This will return false if the article already exists
1569                         $newid = $this->insertOn( $dbw );
1570
1571                         if ( $newid === false ) {
1572                                 $dbw->rollback( __METHOD__ );
1573                                 $status->fatal( 'edit-already-exists' );
1574
1575                                 wfProfileOut( __METHOD__ );
1576                                 return $status;
1577                         }
1578
1579                         # Save the revision text...
1580                         $revision = new Revision( array(
1581                                 'page'       => $newid,
1582                                 'comment'    => $summary,
1583                                 'minor_edit' => $isminor,
1584                                 'text'       => $text,
1585                                 'user'       => $user->getId(),
1586                                 'user_text'  => $user->getName(),
1587                                 'timestamp'  => $now
1588                         ) );
1589                         $revisionId = $revision->insertOn( $dbw );
1590
1591                         # Bug 37225: use accessor to get the text as Revision may trim it
1592                         $text = $revision->getText(); // sanity; EditPage should trim already
1593
1594                         # Update the page record with revision data
1595                         $this->updateRevisionOn( $dbw, $revision, 0 );
1596
1597                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1598
1599                         # Update recentchanges
1600                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1601                                 # Mark as patrolled if the user can do so
1602                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1603                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1604                                 # Add RC row to the DB
1605                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1606                                         '', strlen( $text ), $revisionId, $patrolled );
1607
1608                                 # Log auto-patrolled edits
1609                                 if ( $patrolled ) {
1610                                         PatrolLog::record( $rc, true, $user );
1611                                 }
1612                         }
1613                         $user->incEditCount();
1614                         $dbw->commit( __METHOD__ );
1615
1616                         # Update links, etc.
1617                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1618
1619                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1620                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1621                 }
1622
1623                 # Do updates right now unless deferral was requested
1624                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1625                         DeferredUpdates::doUpdates();
1626                 }
1627
1628                 // Return the new revision (or null) to the caller
1629                 $status->value['revision'] = $revision;
1630
1631                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1632                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1633
1634                 # Promote user to any groups they meet the criteria for
1635                 $user->addAutopromoteOnceGroups( 'onEdit' );
1636
1637                 wfProfileOut( __METHOD__ );
1638                 return $status;
1639         }
1640
1641         /**
1642          * Get parser options suitable for rendering the primary article wikitext
1643          *
1644          * @param IContextSource|User|string $context One of the following:
1645          *        - IContextSource: Use the User and the Language of the provided
1646          *          context
1647          *        - User: Use the provided User object and $wgLang for the language,
1648          *          so use an IContextSource object if possible.
1649          *        - 'canonical': Canonical options (anonymous user with default
1650          *          preferences and content language).
1651          * @return ParserOptions
1652          */
1653         public function makeParserOptions( $context ) {
1654                 global $wgContLang;
1655
1656                 if ( $context instanceof IContextSource ) {
1657                         $options = ParserOptions::newFromContext( $context );
1658                 } elseif ( $context instanceof User ) { // settings per user (even anons)
1659                         $options = ParserOptions::newFromUser( $context );
1660                 } else { // canonical settings
1661                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1662                 }
1663
1664                 if ( $this->getTitle()->isConversionTable() ) {
1665                         $options->disableContentConversion();
1666                 }
1667
1668                 $options->enableLimitReport(); // show inclusion/loop reports
1669                 $options->setTidy( true ); // fix bad HTML
1670
1671                 return $options;
1672         }
1673
1674         /**
1675          * Prepare text which is about to be saved.
1676          * Returns a stdclass with source, pst and output members
1677          * @return bool|object
1678          */
1679         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1680                 global $wgParser, $wgContLang, $wgUser;
1681                 $user = is_null( $user ) ? $wgUser : $user;
1682                 // @TODO fixme: check $user->getId() here???
1683                 if ( $this->mPreparedEdit
1684                         && $this->mPreparedEdit->newText == $text
1685                         && $this->mPreparedEdit->revid == $revid
1686                 ) {
1687                         // Already prepared
1688                         return $this->mPreparedEdit;
1689                 }
1690
1691                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1692                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1693
1694                 $edit = (object)array();
1695                 $edit->revid = $revid;
1696                 $edit->newText = $text;
1697                 $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
1698                 $edit->popts = $this->makeParserOptions( 'canonical' );
1699                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1700                 $edit->oldText = $this->getRawText();
1701
1702                 $this->mPreparedEdit = $edit;
1703
1704                 return $edit;
1705         }
1706
1707         /**
1708          * Do standard deferred updates after page edit.
1709          * Update links tables, site stats, search index and message cache.
1710          * Purges pages that include this page if the text was changed here.
1711          * Every 100th edit, prune the recent changes table.
1712          *
1713          * @private
1714          * @param $revision Revision object
1715          * @param $user User object that did the revision
1716          * @param $options Array of options, following indexes are used:
1717          * - changed: boolean, whether the revision changed the content (default true)
1718          * - created: boolean, whether the revision created the page (default false)
1719          * - oldcountable: boolean or null (default null):
1720          *   - boolean: whether the page was counted as an article before that
1721          *     revision, only used in changed is true and created is false
1722          *   - null: don't change the article count
1723          */
1724         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1725                 global $wgEnableParserCache;
1726
1727                 wfProfileIn( __METHOD__ );
1728
1729                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1730                 $text = $revision->getText();
1731
1732                 # Parse the text
1733                 # Be careful not to double-PST: $text is usually already PST-ed once
1734                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1735                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1736                         $editInfo = $this->prepareTextForEdit( $text, $revision->getId(), $user );
1737                 } else {
1738                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1739                         $editInfo = $this->mPreparedEdit;
1740                 }
1741
1742                 # Save it to the parser cache
1743                 if ( $wgEnableParserCache ) {
1744                         $parserCache = ParserCache::singleton();
1745                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1746                 }
1747
1748                 # Update the links tables and other secondary data
1749                 $updates = $editInfo->output->getSecondaryDataUpdates( $this->mTitle );
1750                 DataUpdate::runUpdates( $updates );
1751
1752                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1753
1754                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1755                         if ( 0 == mt_rand( 0, 99 ) ) {
1756                                 // Flush old entries from the `recentchanges` table; we do this on
1757                                 // random requests so as to avoid an increase in writes for no good reason
1758                                 global $wgRCMaxAge;
1759
1760                                 $dbw = wfGetDB( DB_MASTER );
1761                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1762                                 $dbw->delete(
1763                                         'recentchanges',
1764                                         array( "rc_timestamp < '$cutoff'" ),
1765                                         __METHOD__
1766                                 );
1767                         }
1768                 }
1769
1770                 if ( !$this->mTitle->exists() ) {
1771                         wfProfileOut( __METHOD__ );
1772                         return;
1773                 }
1774
1775                 $id = $this->getId();
1776                 $title = $this->mTitle->getPrefixedDBkey();
1777                 $shortTitle = $this->mTitle->getDBkey();
1778
1779                 if ( !$options['changed'] ) {
1780                         $good = 0;
1781                         $total = 0;
1782                 } elseif ( $options['created'] ) {
1783                         $good = (int)$this->isCountable( $editInfo );
1784                         $total = 1;
1785                 } elseif ( $options['oldcountable'] !== null ) {
1786                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
1787                         $total = 0;
1788                 } else {
1789                         $good = 0;
1790                         $total = 0;
1791                 }
1792
1793                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
1794                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
1795
1796                 # If this is another user's talk page, update newtalk.
1797                 # Don't do this if $options['changed'] = false (null-edits) nor if
1798                 # it's a minor edit and the user doesn't want notifications for those.
1799                 if ( $options['changed']
1800                         && $this->mTitle->getNamespace() == NS_USER_TALK
1801                         && $shortTitle != $user->getTitleKey()
1802                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
1803                 ) {
1804                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1805                                 $other = User::newFromName( $shortTitle, false );
1806                                 if ( !$other ) {
1807                                         wfDebug( __METHOD__ . ": invalid username\n" );
1808                                 } elseif ( User::isIP( $shortTitle ) ) {
1809                                         // An anonymous user
1810                                         $other->setNewtalk( true, $revision );
1811                                 } elseif ( $other->isLoggedIn() ) {
1812                                         $other->setNewtalk( true, $revision );
1813                                 } else {
1814                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1815                                 }
1816                         }
1817                 }
1818
1819                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1820                         MessageCache::singleton()->replace( $shortTitle, $text );
1821                 }
1822
1823                 if( $options['created'] ) {
1824                         self::onArticleCreate( $this->mTitle );
1825                 } else {
1826                         self::onArticleEdit( $this->mTitle );
1827                 }
1828
1829                 wfProfileOut( __METHOD__ );
1830         }
1831
1832         /**
1833          * Edit an article without doing all that other stuff
1834          * The article must already exist; link tables etc
1835          * are not updated, caches are not flushed.
1836          *
1837          * @param $text String: text submitted
1838          * @param $user User The relevant user
1839          * @param $comment String: comment submitted
1840          * @param $minor Boolean: whereas it's a minor modification
1841          */
1842         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
1843                 wfProfileIn( __METHOD__ );
1844
1845                 $dbw = wfGetDB( DB_MASTER );
1846                 $revision = new Revision( array(
1847                         'page'       => $this->getId(),
1848                         'text'       => $text,
1849                         'comment'    => $comment,
1850                         'minor_edit' => $minor ? 1 : 0,
1851                 ) );
1852                 $revision->insertOn( $dbw );
1853                 $this->updateRevisionOn( $dbw, $revision );
1854
1855                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1856
1857                 wfProfileOut( __METHOD__ );
1858         }
1859
1860         /**
1861          * Update the article's restriction field, and leave a log entry.
1862          * This works for protection both existing and non-existing pages.
1863          *
1864          * @param $limit Array: set of restriction keys
1865          * @param $reason String
1866          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1867          * @param $expiry Array: per restriction type expiration
1868          * @param $user User The user updating the restrictions
1869          * @return Status
1870          */
1871         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
1872                 global $wgContLang;
1873
1874                 if ( wfReadOnly() ) {
1875                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
1876                 }
1877
1878                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1879
1880                 $id = $this->mTitle->getArticleID();
1881
1882                 if ( !$cascade ) {
1883                         $cascade = false;
1884                 }
1885
1886                 // Take this opportunity to purge out expired restrictions
1887                 Title::purgeExpiredRestrictions();
1888
1889                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1890                 # we expect a single selection, but the schema allows otherwise.
1891                 $isProtected = false;
1892                 $protect = false;
1893                 $changed = false;
1894
1895                 $dbw = wfGetDB( DB_MASTER );
1896
1897                 foreach ( $restrictionTypes as $action ) {
1898                         if ( !isset( $expiry[$action] ) ) {
1899                                 $expiry[$action] = $dbw->getInfinity();
1900                         }
1901                         if ( !isset( $limit[$action] ) ) {
1902                                 $limit[$action] = '';
1903                         } elseif ( $limit[$action] != '' ) {
1904                                 $protect = true;
1905                         }
1906
1907                         # Get current restrictions on $action
1908                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
1909                         if ( $current != '' ) {
1910                                 $isProtected = true;
1911                         }
1912
1913                         if ( $limit[$action] != $current ) {
1914                                 $changed = true;
1915                         } elseif ( $limit[$action] != '' ) {
1916                                 # Only check expiry change if the action is actually being
1917                                 # protected, since expiry does nothing on an not-protected
1918                                 # action.
1919                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
1920                                         $changed = true;
1921                                 }
1922                         }
1923                 }
1924
1925                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
1926                         $changed = true;
1927                 }
1928
1929                 # If nothing's changed, do nothing
1930                 if ( !$changed ) {
1931                         return Status::newGood();
1932                 }
1933
1934                 if ( !$protect ) { # No protection at all means unprotection
1935                         $revCommentMsg = 'unprotectedarticle';
1936                         $logAction = 'unprotect';
1937                 } elseif ( $isProtected ) {
1938                         $revCommentMsg = 'modifiedarticleprotection';
1939                         $logAction = 'modify';
1940                 } else {
1941                         $revCommentMsg = 'protectedarticle';
1942                         $logAction = 'protect';
1943                 }
1944
1945                 $encodedExpiry = array();
1946                 $protectDescription = '';
1947                 foreach ( $limit as $action => $restrictions ) {
1948                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1949                         if ( $restrictions != '' ) {
1950                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
1951                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1952                                         $protectDescription .= wfMessage(
1953                                                 'protect-expiring',
1954                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1955                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1956                                                 $wgContLang->time( $expiry[$action], false, false )
1957                                         )->inContentLanguage()->text();
1958                                 } else {
1959                                         $protectDescription .= wfMessage( 'protect-expiry-indefinite' )
1960                                                 ->inContentLanguage()->text();
1961                                 }
1962
1963                                 $protectDescription .= ') ';
1964                         }
1965                 }
1966                 $protectDescription = trim( $protectDescription );
1967
1968                 if ( $id ) { # Protection of existing page
1969                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1970                                 return Status::newGood();
1971                         }
1972
1973                         # Only restrictions with the 'protect' right can cascade...
1974                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1975                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1976
1977                         # The schema allows multiple restrictions
1978                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1979                                 $cascade = false;
1980                         }
1981
1982                         # Update restrictions table
1983                         foreach ( $limit as $action => $restrictions ) {
1984                                 if ( $restrictions != '' ) {
1985                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1986                                                 array( 'pr_page' => $id,
1987                                                         'pr_type' => $action,
1988                                                         'pr_level' => $restrictions,
1989                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1990                                                         'pr_expiry' => $encodedExpiry[$action]
1991                                                 ),
1992                                                 __METHOD__
1993                                         );
1994                                 } else {
1995                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1996                                                 'pr_type' => $action ), __METHOD__ );
1997                                 }
1998                         }
1999
2000                         # Prepare a null revision to be added to the history
2001                         $editComment = $wgContLang->ucfirst(
2002                                 wfMessage(
2003                                         $revCommentMsg,
2004                                         $this->mTitle->getPrefixedText()
2005                                 )->inContentLanguage()->text()
2006                         );
2007                         if ( $reason ) {
2008                                 $editComment .= ": $reason";
2009                         }
2010                         if ( $protectDescription ) {
2011                                 $editComment .= " ($protectDescription)";
2012                         }
2013                         if ( $cascade ) {
2014                                 // FIXME: Should use 'brackets' message.
2015                                 $editComment .= ' [' . wfMessage( 'protect-summary-cascade' )
2016                                         ->inContentLanguage()->text() . ']';
2017                         }
2018
2019                         # Insert a null revision
2020                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2021                         $nullRevId = $nullRevision->insertOn( $dbw );
2022
2023                         $latest = $this->getLatest();
2024                         # Update page record
2025                         $dbw->update( 'page',
2026                                 array( /* SET */
2027                                         'page_touched' => $dbw->timestamp(),
2028                                         'page_restrictions' => '',
2029                                         'page_latest' => $nullRevId
2030                                 ), array( /* WHERE */
2031                                         'page_id' => $id
2032                                 ), __METHOD__
2033                         );
2034
2035                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2036                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2037                 } else { # Protection of non-existing page (also known as "title protection")
2038                         # Cascade protection is meaningless in this case
2039                         $cascade = false;
2040
2041                         if ( $limit['create'] != '' ) {
2042                                 $dbw->replace( 'protected_titles',
2043                                         array( array( 'pt_namespace', 'pt_title' ) ),
2044                                         array(
2045                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2046                                                 'pt_title' => $this->mTitle->getDBkey(),
2047                                                 'pt_create_perm' => $limit['create'],
2048                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2049                                                 'pt_expiry' => $encodedExpiry['create'],
2050                                                 'pt_user' => $user->getId(),
2051                                                 'pt_reason' => $reason,
2052                                         ), __METHOD__
2053                                 );
2054                         } else {
2055                                 $dbw->delete( 'protected_titles',
2056                                         array(
2057                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2058                                                 'pt_title' => $this->mTitle->getDBkey()
2059                                         ), __METHOD__
2060                                 );
2061                         }
2062                 }
2063
2064                 $this->mTitle->flushRestrictions();
2065
2066                 if ( $logAction == 'unprotect' ) {
2067                         $logParams = array();
2068                 } else {
2069                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2070                 }
2071
2072                 # Update the protection log
2073                 $log = new LogPage( 'protect' );
2074                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2075
2076                 return Status::newGood();
2077         }
2078
2079         /**
2080          * Take an array of page restrictions and flatten it to a string
2081          * suitable for insertion into the page_restrictions field.
2082          * @param $limit Array
2083          * @throws MWException
2084          * @return String
2085          */
2086         protected static function flattenRestrictions( $limit ) {
2087                 if ( !is_array( $limit ) ) {
2088                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2089                 }
2090
2091                 $bits = array();
2092                 ksort( $limit );
2093
2094                 foreach ( $limit as $action => $restrictions ) {
2095                         if ( $restrictions != '' ) {
2096                                 $bits[] = "$action=$restrictions";
2097                         }
2098                 }
2099
2100                 return implode( ':', $bits );
2101         }
2102
2103         /**
2104          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2105          * backwards compatibility, if you care about error reporting you should use
2106          * doDeleteArticleReal() instead.
2107          *
2108          * Deletes the article with database consistency, writes logs, purges caches
2109          *
2110          * @param $reason string delete reason for deletion log
2111          * @param $suppress boolean suppress all revisions and log the deletion in
2112          *        the suppression log instead of the deletion log
2113          * @param $id int article ID
2114          * @param $commit boolean defaults to true, triggers transaction end
2115          * @param &$error Array of errors to append to
2116          * @param $user User The deleting user
2117          * @return boolean true if successful
2118          */
2119         public function doDeleteArticle(
2120                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2121         ) {
2122                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2123                 return $status->isGood();
2124         }
2125
2126         /**
2127          * Back-end article deletion
2128          * Deletes the article with database consistency, writes logs, purges caches
2129          *
2130          * @since 1.19
2131          *
2132          * @param $reason string delete reason for deletion log
2133          * @param $suppress boolean suppress all revisions and log the deletion in
2134          *        the suppression log instead of the deletion log
2135          * @param $commit boolean defaults to true, triggers transaction end
2136          * @param &$error Array of errors to append to
2137          * @param $user User The deleting user
2138          * @return Status: Status object; if successful, $status->value is the log_id of the
2139          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2140          *                 found, $status is a non-fatal 'cannotdelete' error
2141          */
2142         public function doDeleteArticleReal(
2143                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2144         ) {
2145                 global $wgUser;
2146
2147                 wfDebug( __METHOD__ . "\n" );
2148
2149                 $status = Status::newGood();
2150
2151                 if ( $this->mTitle->getDBkey() === '' ) {
2152                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2153                         return $status;
2154                 }
2155
2156                 $user = is_null( $user ) ? $wgUser : $user;
2157                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2158                         if ( $status->isOK() ) {
2159                                 // Hook aborted but didn't set a fatal status
2160                                 $status->fatal( 'delete-hook-aborted' );
2161                         }
2162                         return $status;
2163                 }
2164
2165                 if ( $id == 0 ) {
2166                         $this->loadPageData( 'forupdate' );
2167                         $id = $this->getID();
2168                         if ( $id == 0 ) {
2169                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2170                                 return $status;
2171                         }
2172                 }
2173
2174                 // Bitfields to further suppress the content
2175                 if ( $suppress ) {
2176                         $bitfield = 0;
2177                         // This should be 15...
2178                         $bitfield |= Revision::DELETED_TEXT;
2179                         $bitfield |= Revision::DELETED_COMMENT;
2180                         $bitfield |= Revision::DELETED_USER;
2181                         $bitfield |= Revision::DELETED_RESTRICTED;
2182                 } else {
2183                         $bitfield = 'rev_deleted';
2184                 }
2185
2186                 $dbw = wfGetDB( DB_MASTER );
2187                 $dbw->begin( __METHOD__ );
2188                 // For now, shunt the revision data into the archive table.
2189                 // Text is *not* removed from the text table; bulk storage
2190                 // is left intact to avoid breaking block-compression or
2191                 // immutable storage schemes.
2192                 //
2193                 // For backwards compatibility, note that some older archive
2194                 // table entries will have ar_text and ar_flags fields still.
2195                 //
2196                 // In the future, we may keep revisions and mark them with
2197                 // the rev_deleted field, which is reserved for this purpose.
2198                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2199                         array(
2200                                 'ar_namespace'  => 'page_namespace',
2201                                 'ar_title'      => 'page_title',
2202                                 'ar_comment'    => 'rev_comment',
2203                                 'ar_user'       => 'rev_user',
2204                                 'ar_user_text'  => 'rev_user_text',
2205                                 'ar_timestamp'  => 'rev_timestamp',
2206                                 'ar_minor_edit' => 'rev_minor_edit',
2207                                 'ar_rev_id'     => 'rev_id',
2208                                 'ar_parent_id'  => 'rev_parent_id',
2209                                 'ar_text_id'    => 'rev_text_id',
2210                                 'ar_text'       => '\'\'', // Be explicit to appease
2211                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2212                                 'ar_len'        => 'rev_len',
2213                                 'ar_page_id'    => 'page_id',
2214                                 'ar_deleted'    => $bitfield,
2215                                 'ar_sha1'       => 'rev_sha1'
2216                         ), array(
2217                                 'page_id' => $id,
2218                                 'page_id = rev_page'
2219                         ), __METHOD__
2220                 );
2221
2222                 # Now that it's safely backed up, delete it
2223                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2224                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2225
2226                 if ( !$ok ) {
2227                         $dbw->rollback( __METHOD__ );
2228                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2229                         return $status;
2230                 }
2231
2232                 $this->doDeleteUpdates( $id );
2233
2234                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2235                 $logtype = $suppress ? 'suppress' : 'delete';
2236
2237                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2238                 $logEntry->setPerformer( $user );
2239                 $logEntry->setTarget( $this->mTitle );
2240                 $logEntry->setComment( $reason );
2241                 $logid = $logEntry->insert();
2242                 $logEntry->publish( $logid );
2243
2244                 if ( $commit ) {
2245                         $dbw->commit( __METHOD__ );
2246                 }
2247
2248                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2249                 $status->value = $logid;
2250                 return $status;
2251         }
2252
2253         /**
2254          * Do some database updates after deletion
2255          *
2256          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2257          */
2258         public function doDeleteUpdates( $id ) {
2259                 # update site status
2260                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2261
2262                 # remove secondary indexes, etc
2263                 $updates = $this->getDeletionUpdates( );
2264                 DataUpdate::runUpdates( $updates );
2265
2266                 # Clear caches
2267                 WikiPage::onArticleDelete( $this->mTitle );
2268
2269                 # Reset this object
2270                 $this->clear();
2271
2272                 # Clear the cached article id so the interface doesn't act like we exist
2273                 $this->mTitle->resetArticleID( 0 );
2274         }
2275
2276         public function getDeletionUpdates() {
2277                 $updates = array(
2278                         new LinksDeletionUpdate( $this ),
2279                 );
2280
2281                 //@todo: make a hook to add update objects
2282                 //NOTE: deletion updates will be determined by the ContentHandler in the future
2283                 return $updates;
2284         }
2285
2286         /**
2287          * Roll back the most recent consecutive set of edits to a page
2288          * from the same user; fails if there are no eligible edits to
2289          * roll back to, e.g. user is the sole contributor. This function
2290          * performs permissions checks on $user, then calls commitRollback()
2291          * to do the dirty work
2292          *
2293          * @todo: seperate the business/permission stuff out from backend code
2294          *
2295          * @param $fromP String: Name of the user whose edits to rollback.
2296          * @param $summary String: Custom summary. Set to default summary if empty.
2297          * @param $token String: Rollback token.
2298          * @param $bot Boolean: If true, mark all reverted edits as bot.
2299          *
2300          * @param $resultDetails Array: contains result-specific array of additional values
2301          *    'alreadyrolled' : 'current' (rev)
2302          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2303          *
2304          * @param $user User The user performing the rollback
2305          * @return array of errors, each error formatted as
2306          *   array(messagekey, param1, param2, ...).
2307          * On success, the array is empty.  This array can also be passed to
2308          * OutputPage::showPermissionsErrorPage().
2309          */
2310         public function doRollback(
2311                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2312         ) {
2313                 $resultDetails = null;
2314
2315                 # Check permissions
2316                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2317                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2318                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2319
2320                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2321                         $errors[] = array( 'sessionfailure' );
2322                 }
2323
2324                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2325                         $errors[] = array( 'actionthrottledtext' );
2326                 }
2327
2328                 # If there were errors, bail out now
2329                 if ( !empty( $errors ) ) {
2330                         return $errors;
2331                 }
2332
2333                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2334         }
2335
2336         /**
2337          * Backend implementation of doRollback(), please refer there for parameter
2338          * and return value documentation
2339          *
2340          * NOTE: This function does NOT check ANY permissions, it just commits the
2341          * rollback to the DB. Therefore, you should only call this function direct-
2342          * ly if you want to use custom permissions checks. If you don't, use
2343          * doRollback() instead.
2344          * @param $fromP String: Name of the user whose edits to rollback.
2345          * @param $summary String: Custom summary. Set to default summary if empty.
2346          * @param $bot Boolean: If true, mark all reverted edits as bot.
2347          *
2348          * @param $resultDetails Array: contains result-specific array of additional values
2349          * @param $guser User The user performing the rollback
2350          * @return array
2351          */
2352         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2353                 global $wgUseRCPatrol, $wgContLang;
2354
2355                 $dbw = wfGetDB( DB_MASTER );
2356
2357                 if ( wfReadOnly() ) {
2358                         return array( array( 'readonlytext' ) );
2359                 }
2360
2361                 # Get the last editor
2362                 $current = $this->getRevision();
2363                 if ( is_null( $current ) ) {
2364                         # Something wrong... no page?
2365                         return array( array( 'notanarticle' ) );
2366                 }
2367
2368                 $from = str_replace( '_', ' ', $fromP );
2369                 # User name given should match up with the top revision.
2370                 # If the user was deleted then $from should be empty.
2371                 if ( $from != $current->getUserText() ) {
2372                         $resultDetails = array( 'current' => $current );
2373                         return array( array( 'alreadyrolled',
2374                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2375                                 htmlspecialchars( $fromP ),
2376                                 htmlspecialchars( $current->getUserText() )
2377                         ) );
2378                 }
2379
2380                 # Get the last edit not by this guy...
2381                 # Note: these may not be public values
2382                 $user = intval( $current->getRawUser() );
2383                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2384                 $s = $dbw->selectRow( 'revision',
2385                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2386                         array( 'rev_page' => $current->getPage(),
2387                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2388                         ), __METHOD__,
2389                         array( 'USE INDEX' => 'page_timestamp',
2390                                 'ORDER BY' => 'rev_timestamp DESC' )
2391                         );
2392                 if ( $s === false ) {
2393                         # No one else ever edited this page
2394                         return array( array( 'cantrollback' ) );
2395                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2396                         # Only admins can see this text
2397                         return array( array( 'notvisiblerev' ) );
2398                 }
2399
2400                 $set = array();
2401                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2402                         # Mark all reverted edits as bot
2403                         $set['rc_bot'] = 1;
2404                 }
2405
2406                 if ( $wgUseRCPatrol ) {
2407                         # Mark all reverted edits as patrolled
2408                         $set['rc_patrolled'] = 1;
2409                 }
2410
2411                 if ( count( $set ) ) {
2412                         $dbw->update( 'recentchanges', $set,
2413                                 array( /* WHERE */
2414                                         'rc_cur_id' => $current->getPage(),
2415                                         'rc_user_text' => $current->getUserText(),
2416                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2417                                 ), __METHOD__
2418                         );
2419                 }
2420
2421                 # Generate the edit summary if necessary
2422                 $target = Revision::newFromId( $s->rev_id );
2423                 if ( empty( $summary ) ) {
2424                         if ( $from == '' ) { // no public user name
2425                                 $summary = wfMessage( 'revertpage-nouser' );
2426                         } else {
2427                                 $summary = wfMessage( 'revertpage' );
2428                         }
2429                 }
2430
2431                 # Allow the custom summary to use the same args as the default message
2432                 $args = array(
2433                         $target->getUserText(), $from, $s->rev_id,
2434                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2435                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2436                 );
2437                 if( $summary instanceof Message ) {
2438                         $summary = $summary->params( $args )->inContentLanguage()->text();
2439                 } else {
2440                         $summary = wfMsgReplaceArgs( $summary, $args );
2441                 }
2442
2443                 # Truncate for whole multibyte characters.
2444                 $summary = $wgContLang->truncate( $summary, 255 );
2445
2446                 # Save
2447                 $flags = EDIT_UPDATE;
2448
2449                 if ( $guser->isAllowed( 'minoredit' ) ) {
2450                         $flags |= EDIT_MINOR;
2451                 }
2452
2453                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2454                         $flags |= EDIT_FORCE_BOT;
2455                 }
2456
2457                 # Actually store the edit
2458                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId(), $guser );
2459                 if ( !empty( $status->value['revision'] ) ) {
2460                         $revId = $status->value['revision']->getId();
2461                 } else {
2462                         $revId = false;
2463                 }
2464
2465                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2466
2467                 $resultDetails = array(
2468                         'summary' => $summary,
2469                         'current' => $current,
2470                         'target'  => $target,
2471                         'newid'   => $revId
2472                 );
2473
2474                 return array();
2475         }
2476
2477         /**
2478          * The onArticle*() functions are supposed to be a kind of hooks
2479          * which should be called whenever any of the specified actions
2480          * are done.
2481          *
2482          * This is a good place to put code to clear caches, for instance.
2483          *
2484          * This is called on page move and undelete, as well as edit
2485          *
2486          * @param $title Title object
2487          */
2488         public static function onArticleCreate( $title ) {
2489                 # Update existence markers on article/talk tabs...
2490                 if ( $title->isTalkPage() ) {
2491                         $other = $title->getSubjectPage();
2492                 } else {
2493                         $other = $title->getTalkPage();
2494                 }
2495
2496                 $other->invalidateCache();
2497                 $other->purgeSquid();
2498
2499                 $title->touchLinks();
2500                 $title->purgeSquid();
2501                 $title->deleteTitleProtection();
2502         }
2503
2504         /**
2505          * Clears caches when article is deleted
2506          *
2507          * @param $title Title
2508          */
2509         public static function onArticleDelete( $title ) {
2510                 # Update existence markers on article/talk tabs...
2511                 if ( $title->isTalkPage() ) {
2512                         $other = $title->getSubjectPage();
2513                 } else {
2514                         $other = $title->getTalkPage();
2515                 }
2516
2517                 $other->invalidateCache();
2518                 $other->purgeSquid();
2519
2520                 $title->touchLinks();
2521                 $title->purgeSquid();
2522
2523                 # File cache
2524                 HTMLFileCache::clearFileCache( $title );
2525
2526                 # Messages
2527                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2528                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2529                 }
2530
2531                 # Images
2532                 if ( $title->getNamespace() == NS_FILE ) {
2533                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2534                         $update->doUpdate();
2535                 }
2536
2537                 # User talk pages
2538                 if ( $title->getNamespace() == NS_USER_TALK ) {
2539                         $user = User::newFromName( $title->getText(), false );
2540                         if ( $user ) {
2541                                 $user->setNewtalk( false );
2542                         }
2543                 }
2544
2545                 # Image redirects
2546                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2547         }
2548
2549         /**
2550          * Purge caches on page update etc
2551          *
2552          * @param $title Title object
2553          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2554          */
2555         public static function onArticleEdit( $title ) {
2556                 // Invalidate caches of articles which include this page
2557                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2558
2559
2560                 // Invalidate the caches of all pages which redirect here
2561                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2562
2563                 # Purge squid for this page only
2564                 $title->purgeSquid();
2565
2566                 # Clear file cache for this page only
2567                 HTMLFileCache::clearFileCache( $title );
2568         }
2569
2570         /**#@-*/
2571
2572         /**
2573          * Returns a list of hidden categories this page is a member of.
2574          * Uses the page_props and categorylinks tables.
2575          *
2576          * @return Array of Title objects
2577          */
2578         public function getHiddenCategories() {
2579                 $result = array();
2580                 $id = $this->mTitle->getArticleID();
2581
2582                 if ( $id == 0 ) {
2583                         return array();
2584                 }
2585
2586                 $dbr = wfGetDB( DB_SLAVE );
2587                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2588                         array( 'cl_to' ),
2589                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2590                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2591                         __METHOD__ );
2592
2593                 if ( $res !== false ) {
2594                         foreach ( $res as $row ) {
2595                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2596                         }
2597                 }
2598
2599                 return $result;
2600         }
2601
2602         /**
2603         * Return an applicable autosummary if one exists for the given edit.
2604         * @param $oldtext String: the previous text of the page.
2605         * @param $newtext String: The submitted text of the page.
2606         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2607         * @return string An appropriate autosummary, or an empty string.
2608         */
2609         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2610                 global $wgContLang;
2611
2612                 # Decide what kind of autosummary is needed.
2613
2614                 # Redirect autosummaries
2615                 $ot = Title::newFromRedirect( $oldtext );
2616                 $rt = Title::newFromRedirect( $newtext );
2617
2618                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2619                         $truncatedtext = $wgContLang->truncate(
2620                                 str_replace( "\n", ' ', $newtext ),
2621                                 max( 0, 255
2622                                         - strlen( wfMessage( 'autoredircomment' )->inContentLanguage()->text() )
2623                                         - strlen( $rt->getFullText() )
2624                                 ) );
2625                         return wfMessage( 'autoredircomment', $rt->getFullText() )
2626                                 ->rawParams( $truncatedtext )->inContentLanguage()->text();
2627                 }
2628
2629                 # New page autosummaries
2630                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2631                         # If they're making a new article, give its text, truncated, in the summary.
2632
2633                         $truncatedtext = $wgContLang->truncate(
2634                                 str_replace( "\n", ' ', $newtext ),
2635                                 max( 0, 200 - strlen( wfMessage( 'autosumm-new' )->inContentLanguage()->text() ) ) );
2636
2637                         return wfMessage( 'autosumm-new' )->rawParams( $truncatedtext )
2638                                 ->inContentLanguage()->text();
2639                 }
2640
2641                 # Blanking autosummaries
2642                 if ( $oldtext != '' && $newtext == '' ) {
2643                         return wfMessage( 'autosumm-blank' )->inContentLanguage()->text();
2644                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2645                         # Removing more than 90% of the article
2646
2647                         $truncatedtext = $wgContLang->truncate(
2648                                 $newtext,
2649                                 max( 0, 200 - strlen( wfMessage( 'autosumm-replace' )->inContentLanguage()->text() ) ) );
2650
2651                         return wfMessage( 'autosumm-replace' )->rawParams( $truncatedtext )
2652                                 ->inContentLanguage()->text();
2653                 }
2654
2655                 # If we reach this point, there's no applicable autosummary for our case, so our
2656                 # autosummary is empty.
2657                 return '';
2658         }
2659
2660         /**
2661          * Auto-generates a deletion reason
2662          *
2663          * @param &$hasHistory Boolean: whether the page has a history
2664          * @return mixed String containing deletion reason or empty string, or boolean false
2665          *    if no revision occurred
2666          */
2667         public function getAutoDeleteReason( &$hasHistory ) {
2668                 global $wgContLang;
2669
2670                 // Get the last revision
2671                 $rev = $this->getRevision();
2672
2673                 if ( is_null( $rev ) ) {
2674                         return false;
2675                 }
2676
2677                 // Get the article's contents
2678                 $contents = $rev->getText();
2679                 $blank = false;
2680
2681                 // If the page is blank, use the text from the previous revision,
2682                 // which can only be blank if there's a move/import/protect dummy revision involved
2683                 if ( $contents == '' ) {
2684                         $prev = $rev->getPrevious();
2685
2686                         if ( $prev )    {
2687                                 $contents = $prev->getText();
2688                                 $blank = true;
2689                         }
2690                 }
2691
2692                 $dbw = wfGetDB( DB_MASTER );
2693
2694                 // Find out if there was only one contributor
2695                 // Only scan the last 20 revisions
2696                 $res = $dbw->select( 'revision', 'rev_user_text',
2697                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2698                         __METHOD__,
2699                         array( 'LIMIT' => 20 )
2700                 );
2701
2702                 if ( $res === false ) {
2703                         // This page has no revisions, which is very weird
2704                         return false;
2705                 }
2706
2707                 $hasHistory = ( $res->numRows() > 1 );
2708                 $row = $dbw->fetchObject( $res );
2709
2710                 if ( $row ) { // $row is false if the only contributor is hidden
2711                         $onlyAuthor = $row->rev_user_text;
2712                         // Try to find a second contributor
2713                         foreach ( $res as $row ) {
2714                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2715                                         $onlyAuthor = false;
2716                                         break;
2717                                 }
2718                         }
2719                 } else {
2720                         $onlyAuthor = false;
2721                 }
2722
2723                 // Generate the summary with a '$1' placeholder
2724                 if ( $blank ) {
2725                         // The current revision is blank and the one before is also
2726                         // blank. It's just not our lucky day
2727                         $reason = wfMessage( 'exbeforeblank', '$1' )->inContentLanguage()->text();
2728                 } else {
2729                         if ( $onlyAuthor ) {
2730                                 $reason = wfMessage(
2731                                         'excontentauthor',
2732                                         '$1',
2733                                         $onlyAuthor
2734                                 )->inContentLanguage()->text();
2735                         } else {
2736                                 $reason = wfMessage( 'excontent', '$1' )->inContentLanguage()->text();
2737                         }
2738                 }
2739
2740                 if ( $reason == '-' ) {
2741                         // Allow these UI messages to be blanked out cleanly
2742                         return '';
2743                 }
2744
2745                 // Replace newlines with spaces to prevent uglyness
2746                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2747                 // Calculate the maximum amount of chars to get
2748                 // Max content length = max comment length - length of the comment (excl. $1)
2749                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2750                 $contents = $wgContLang->truncate( $contents, $maxLength );
2751                 // Remove possible unfinished links
2752                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2753                 // Now replace the '$1' placeholder
2754                 $reason = str_replace( '$1', $contents, $reason );
2755
2756                 return $reason;
2757         }
2758
2759         /**
2760          * Update all the appropriate counts in the category table, given that
2761          * we've added the categories $added and deleted the categories $deleted.
2762          *
2763          * @param $added array   The names of categories that were added
2764          * @param $deleted array The names of categories that were deleted
2765          */
2766         public function updateCategoryCounts( $added, $deleted ) {
2767                 $ns = $this->mTitle->getNamespace();
2768                 $dbw = wfGetDB( DB_MASTER );
2769
2770                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2771                 # exist, we might legitimately not create it, but it's simpler to just
2772                 # create it and then give it a negative value, since the value is bogus
2773                 # anyway.
2774                 #
2775                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2776                 $insertCats = array_merge( $added, $deleted );
2777                 if ( !$insertCats ) {
2778                         # Okay, nothing to do
2779                         return;
2780                 }
2781
2782                 $insertRows = array();
2783
2784                 foreach ( $insertCats as $cat ) {
2785                         $insertRows[] = array(
2786                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2787                                 'cat_title' => $cat
2788                         );
2789                 }
2790                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2791
2792                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2793                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2794
2795                 if ( $ns == NS_CATEGORY ) {
2796                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2797                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2798                 } elseif ( $ns == NS_FILE ) {
2799                         $addFields[]    = 'cat_files = cat_files + 1';
2800                         $removeFields[] = 'cat_files = cat_files - 1';
2801                 }
2802
2803                 if ( $added ) {
2804                         $dbw->update(
2805                                 'category',
2806                                 $addFields,
2807                                 array( 'cat_title' => $added ),
2808                                 __METHOD__
2809                         );
2810                 }
2811
2812                 if ( $deleted ) {
2813                         $dbw->update(
2814                                 'category',
2815                                 $removeFields,
2816                                 array( 'cat_title' => $deleted ),
2817                                 __METHOD__
2818                         );
2819                 }
2820         }
2821
2822         /**
2823          * Updates cascading protections
2824          *
2825          * @param $parserOutput ParserOutput object for the current version
2826          */
2827         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2828                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2829                         return;
2830                 }
2831
2832                 // templatelinks table may have become out of sync,
2833                 // especially if using variable-based transclusions.
2834                 // For paranoia, check if things have changed and if
2835                 // so apply updates to the database. This will ensure
2836                 // that cascaded protections apply as soon as the changes
2837                 // are visible.
2838
2839                 # Get templates from templatelinks
2840                 $id = $this->mTitle->getArticleID();
2841
2842                 $tlTemplates = array();
2843
2844                 $dbr = wfGetDB( DB_SLAVE );
2845                 $res = $dbr->select( array( 'templatelinks' ),
2846                         array( 'tl_namespace', 'tl_title' ),
2847                         array( 'tl_from' => $id ),
2848                         __METHOD__
2849                 );
2850
2851                 foreach ( $res as $row ) {
2852                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
2853                 }
2854
2855                 # Get templates from parser output.
2856                 $poTemplates = array();
2857                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
2858                         foreach ( $templates as $dbk => $id ) {
2859                                 $poTemplates["$ns:$dbk"] = true;
2860                         }
2861                 }
2862
2863                 # Get the diff
2864                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
2865
2866                 if ( count( $templates_diff ) > 0 ) {
2867                         # Whee, link updates time.
2868                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
2869                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
2870                         $u->doUpdate();
2871                 }
2872         }
2873
2874         /**
2875          * Return a list of templates used by this article.
2876          * Uses the templatelinks table
2877          *
2878          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
2879          * @return Array of Title objects
2880          */
2881         public function getUsedTemplates() {
2882                 return $this->mTitle->getTemplateLinksFrom();
2883         }
2884
2885         /**
2886          * Perform article updates on a special page creation.
2887          *
2888          * @param $rev Revision object
2889          *
2890          * @todo This is a shitty interface function. Kill it and replace the
2891          * other shitty functions like doEditUpdates and such so it's not needed
2892          * anymore.
2893          * @deprecated since 1.18, use doEditUpdates()
2894          */
2895         public function createUpdates( $rev ) {
2896                 wfDeprecated( __METHOD__, '1.18' );
2897                 global $wgUser;
2898                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
2899         }
2900
2901         /**
2902          * This function is called right before saving the wikitext,
2903          * so we can do things like signatures and links-in-context.
2904          *
2905          * @deprecated in 1.19; use Parser::preSaveTransform() instead
2906          * @param $text String article contents
2907          * @param $user User object: user doing the edit
2908          * @param $popts ParserOptions object: parser options, default options for
2909          *               the user loaded if null given
2910          * @return string article contents with altered wikitext markup (signatures
2911          *      converted, {{subst:}}, templates, etc.)
2912          */
2913         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2914                 global $wgParser, $wgUser;
2915
2916                 wfDeprecated( __METHOD__, '1.19' );
2917
2918                 $user = is_null( $user ) ? $wgUser : $user;
2919
2920                 if ( $popts === null ) {
2921                         $popts = ParserOptions::newFromUser( $user );
2922                 }
2923
2924                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2925         }
2926
2927         /**
2928          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
2929          *
2930          * @deprecated in 1.19; use Title::isBigDeletion() instead.
2931          * @return bool
2932          */
2933         public function isBigDeletion() {
2934                 wfDeprecated( __METHOD__, '1.19' );
2935                 return $this->mTitle->isBigDeletion();
2936         }
2937
2938         /**
2939          * Get the  approximate revision count of this page.
2940          *
2941          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
2942          * @return int
2943          */
2944         public function estimateRevisionCount() {
2945                 wfDeprecated( __METHOD__, '1.19' );
2946                 return $this->mTitle->estimateRevisionCount();
2947         }
2948
2949         /**
2950          * Update the article's restriction field, and leave a log entry.
2951          *
2952          * @deprecated since 1.19
2953          * @param $limit Array: set of restriction keys
2954          * @param $reason String
2955          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2956          * @param $expiry Array: per restriction type expiration
2957          * @param $user User The user updating the restrictions
2958          * @return bool true on success
2959          */
2960         public function updateRestrictions(
2961                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
2962         ) {
2963                 global $wgUser;
2964
2965                 $user = is_null( $user ) ? $wgUser : $user;
2966
2967                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
2968         }
2969
2970         /**
2971          * @deprecated since 1.18
2972          */
2973         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2974                 wfDeprecated( __METHOD__, '1.18' );
2975                 global $wgUser;
2976                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2977         }
2978
2979         /**
2980          * @deprecated since 1.18
2981          */
2982         public function viewUpdates() {
2983                 wfDeprecated( __METHOD__, '1.18' );
2984                 global $wgUser;
2985                 return $this->doViewUpdates( $wgUser );
2986         }
2987
2988         /**
2989          * @deprecated since 1.18
2990          * @param $oldid int
2991          * @return bool
2992          */
2993         public function useParserCache( $oldid ) {
2994                 wfDeprecated( __METHOD__, '1.18' );
2995                 global $wgUser;
2996                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
2997         }
2998 }
2999
3000 class PoolWorkArticleView extends PoolCounterWork {
3001
3002         /**
3003          * @var Page
3004          */
3005         private $page;
3006
3007         /**
3008          * @var string
3009          */
3010         private $cacheKey;
3011
3012         /**
3013          * @var integer
3014          */
3015         private $revid;
3016
3017         /**
3018          * @var ParserOptions
3019          */
3020         private $parserOptions;
3021
3022         /**
3023          * @var string|null
3024          */
3025         private $text;
3026
3027         /**
3028          * @var ParserOutput|bool
3029          */
3030         private $parserOutput = false;
3031
3032         /**
3033          * @var bool
3034          */
3035         private $isDirty = false;
3036
3037         /**
3038          * @var Status|bool
3039          */
3040         private $error = false;
3041
3042         /**
3043          * Constructor
3044          *
3045          * @param $page Page
3046          * @param $revid Integer: ID of the revision being parsed
3047          * @param $useParserCache Boolean: whether to use the parser cache
3048          * @param $parserOptions parserOptions to use for the parse operation
3049          * @param $text String: text to parse or null to load it
3050          */
3051         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
3052                 $this->page = $page;
3053                 $this->revid = $revid;
3054                 $this->cacheable = $useParserCache;
3055                 $this->parserOptions = $parserOptions;
3056                 $this->text = $text;
3057                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3058                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3059         }
3060
3061         /**
3062          * Get the ParserOutput from this object, or false in case of failure
3063          *
3064          * @return ParserOutput
3065          */
3066         public function getParserOutput() {
3067                 return $this->parserOutput;
3068         }
3069
3070         /**
3071          * Get whether the ParserOutput is a dirty one (i.e. expired)
3072          *
3073          * @return bool
3074          */
3075         public function getIsDirty() {
3076                 return $this->isDirty;
3077         }
3078
3079         /**
3080          * Get a Status object in case of error or false otherwise
3081          *
3082          * @return Status|bool
3083          */
3084         public function getError() {
3085                 return $this->error;
3086         }
3087
3088         /**
3089          * @return bool
3090          */
3091         function doWork() {
3092                 global $wgParser, $wgUseFileCache;
3093
3094                 $isCurrent = $this->revid === $this->page->getLatest();
3095
3096                 if ( $this->text !== null ) {
3097                         $text = $this->text;
3098                 } elseif ( $isCurrent ) {
3099                         $text = $this->page->getRawText();
3100                 } else {
3101                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3102                         if ( $rev === null ) {
3103                                 return false;
3104                         }
3105                         $text = $rev->getText();
3106                 }
3107
3108                 $time = - microtime( true );
3109                 $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
3110                         $this->parserOptions, true, true, $this->revid );
3111                 $time += microtime( true );
3112
3113                 # Timing hack
3114                 if ( $time > 3 ) {
3115                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3116                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3117                 }
3118
3119                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3120                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3121                 }
3122
3123                 // Make sure file cache is not used on uncacheable content.
3124                 // Output that has magic words in it can still use the parser cache
3125                 // (if enabled), though it will generally expire sooner.
3126                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3127                         $wgUseFileCache = false;
3128                 }
3129
3130                 if ( $isCurrent ) {
3131                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3132                 }
3133
3134                 return true;
3135         }
3136
3137         /**
3138          * @return bool
3139          */
3140         function getCachedWork() {
3141                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3142
3143                 if ( $this->parserOutput === false ) {
3144                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3145                         return false;
3146                 } else {
3147                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3148                         return true;
3149                 }
3150         }
3151
3152         /**
3153          * @return bool
3154          */
3155         function fallback() {
3156                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3157
3158                 if ( $this->parserOutput === false ) {
3159                         wfDebugLog( 'dirty', "dirty missing\n" );
3160                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3161                         return false;
3162                 } else {
3163                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3164                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3165                         $this->isDirty = true;
3166                         return true;
3167                 }
3168         }
3169
3170         /**
3171          * @param $status Status
3172          * @return bool
3173          */
3174         function error( $status ) {
3175                 $this->error = $status;
3176                 return false;
3177         }
3178 }