includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20
  21         /**
  22          * @var RequestContext
  23          */
  24         protected $mContext;
  25
  26         var $mContent;                    // !<
  27         var $mContentLoaded = false;      // !<
  28         var $mCounter = -1;               // !< Not loaded
  29         var $mDataLoaded = false;         // !<
  30         var $mIsRedirect = false;         // !<
  31         var $mLatest = false;             // !<
  32         var $mOldId;                      // !<
  33         var $mPreparedEdit = false;
  34
  35         /**
  36          * @var Title
  37          */
  38         var $mRedirectedFrom = null;
  39
  40         /**
  41          * @var Title
  42          */
  43         var $mRedirectTarget = null;
  44
  45         /**
  46          * @var mixed: boolean false or URL string
  47          */
  48         var $mRedirectUrl = false;        // !<
  49         var $mRevIdFetched = 0;           // !<
  50
  51         /**
  52          * @var Revision
  53          */
  54         var $mLastRevision = null;
  55
  56         /**
  57          * @var Revision
  58          */
  59         var $mRevision = null;
  60
  61         var $mTimestamp = '';             // !<
  62         var $mTitle;                      // !< Title object
  63         var $mTouched = '19700101000000'; // !<
  64
  65         /**
  66          * @var ParserOptions: ParserOptions object for $wgUser articles
  67          */
  68         var $mParserOptions;
  69
  70         /**
  71          * @var ParserOutput
  72          */
  73         var $mParserOutput;
  74
  75         /**@}}*/
  76
  77         /**
  78          * Constructor and clear the article
  79          * @param $title Title Reference to a Title object.
  80          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  81          */
  82         public function __construct( Title $title, $oldId = null ) {
  83                 // @todo FIXME: Does the reference play any role here?
  84                 $this->mTitle =& $title;
  85                 $this->mOldId = $oldId;
  86         }
  87
  88         /**
  89          * Create an Article object of the appropriate class for the given page.
  90          *
  91          * @param $title Title
  92          * @param $context RequestContext
  93          * @return Article object
  94          */
  95         public static function newFromTitle( $title, RequestContext $context ) {
  96                 if ( NS_MEDIA == $title->getNamespace() ) {
  97                         // FIXME: where should this go?
  98                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
  99                 }
 100
 101                 $article = null;
 102                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 103                 if ( $article ) {
 104                         $article->setContext( $context );
 105                         return $article;
 106                 }
 107
 108                 switch( $title->getNamespace() ) {
 109                         case NS_FILE:
 110                                 $page = new ImagePage( $title );
 111                                 break;
 112                         case NS_CATEGORY:
 113                                 $page = new CategoryPage( $title );
 114                                 break;
 115                         default:
 116                                 $page = new Article( $title );
 117                 }
 118                 $page->setContext( $context );
 119                 return $page;
 120         }
 121
 122         /**
 123          * Constructor from an page id
 124          * @param $id Int article ID to load
 125          */
 126         public static function newFromID( $id ) {
 127                 $t = Title::newFromID( $id );
 128                 # @todo FIXME: Doesn't inherit right
 129                 return $t == null ? null : new self( $t );
 130                 # return $t == null ? null : new static( $t ); // PHP 5.3
 131         }
 132
 133         /**
 134          * Tell the page view functions that this view was redirected
 135          * from another page on the wiki.
 136          * @param $from Title object.
 137          */
 138         public function setRedirectedFrom( Title $from ) {
 139                 $this->mRedirectedFrom = $from;
 140         }
 141
 142         /**
 143          * If this page is a redirect, get its target
 144          *
 145          * The target will be fetched from the redirect table if possible.
 146          * If this page doesn't have an entry there, call insertRedirect()
 147          * @return Title|mixed object, or null if this page is not a redirect
 148          */
 149         public function getRedirectTarget() {
 150                 if ( !$this->mTitle->isRedirect() ) {
 151                         return null;
 152                 }
 153
 154                 if ( $this->mRedirectTarget !== null ) {
 155                         return $this->mRedirectTarget;
 156                 }
 157
 158                 # Query the redirect table
 159                 $dbr = wfGetDB( DB_SLAVE );
 160                 $row = $dbr->selectRow( 'redirect',
 161                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 162                         array( 'rd_from' => $this->getID() ),
 163                         __METHOD__
 164                 );
 165
 166                 // rd_fragment and rd_interwiki were added later, populate them if empty
 167                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 168                         return $this->mRedirectTarget = Title::makeTitle(
 169                                 $row->rd_namespace, $row->rd_title,
 170                                 $row->rd_fragment, $row->rd_interwiki );
 171                 }
 172
 173                 # This page doesn't have an entry in the redirect table
 174                 return $this->mRedirectTarget = $this->insertRedirect();
 175         }
 176
 177         /**
 178          * Insert an entry for this page into the redirect table.
 179          *
 180          * Don't call this function directly unless you know what you're doing.
 181          * @return Title object or null if not a redirect
 182          */
 183         public function insertRedirect() {
 184                 // recurse through to only get the final target
 185                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 186                 if ( !$retval ) {
 187                         return null;
 188                 }
 189                 $this->insertRedirectEntry( $retval );
 190                 return $retval;
 191         }
 192
 193         /**
 194          * Insert or update the redirect table entry for this page to indicate
 195          * it redirects to $rt .
 196          * @param $rt Title redirect target
 197          */
 198         public function insertRedirectEntry( $rt ) {
 199                 $dbw = wfGetDB( DB_MASTER );
 200                 $dbw->replace( 'redirect', array( 'rd_from' ),
 201                         array(
 202                                 'rd_from' => $this->getID(),
 203                                 'rd_namespace' => $rt->getNamespace(),
 204                                 'rd_title' => $rt->getDBkey(),
 205                                 'rd_fragment' => $rt->getFragment(),
 206                                 'rd_interwiki' => $rt->getInterwiki(),
 207                         ),
 208                         __METHOD__
 209                 );
 210         }
 211
 212         /**
 213          * Get the Title object or URL this page redirects to
 214          *
 215          * @return mixed false, Title of in-wiki target, or string with URL
 216          */
 217         public function followRedirect() {
 218                 return $this->getRedirectURL( $this->getRedirectTarget() );
 219         }
 220
 221         /**
 222          * Get the Title object this text redirects to
 223          *
 224          * @param $text string article content containing redirect info
 225          * @return mixed false, Title of in-wiki target, or string with URL
 226          * @deprecated since 1.17
 227          */
 228         public function followRedirectText( $text ) {
 229                 // recurse through to only get the final target
 230                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 231         }
 232
 233         /**
 234          * Get the Title object or URL to use for a redirect. We use Title
 235          * objects for same-wiki, non-special redirects and URLs for everything
 236          * else.
 237          * @param $rt Title Redirect target
 238          * @return mixed false, Title object of local target, or string with URL
 239          */
 240         public function getRedirectURL( $rt ) {
 241                 if ( $rt ) {
 242                         if ( $rt->getInterwiki() != '' ) {
 243                                 if ( $rt->isLocal() ) {
 244                                         // Offsite wikis need an HTTP redirect.
 245                                         //
 246                                         // This can be hard to reverse and may produce loops,
 247                                         // so they may be disabled in the site configuration.
 248                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 249                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 250                                 }
 251                         } else {
 252                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 253                                         // Gotta handle redirects to special pages differently:
 254                                         // Fill the HTTP response "Location" header and ignore
 255                                         // the rest of the page we're on.
 256                                         //
 257                                         // This can be hard to reverse, so they may be disabled.
 258                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 259                                                 // rolleyes
 260                                         } else {
 261                                                 return $rt->getFullURL();
 262                                         }
 263                                 }
 264
 265                                 return $rt;
 266                         }
 267                 }
 268
 269                 // No or invalid redirect
 270                 return false;
 271         }
 272
 273         /**
 274          * Get the title object of the article
 275          * @return Title object of this page
 276          */
 277         public function getTitle() {
 278                 return $this->mTitle;
 279         }
 280
 281         /**
 282          * Clear the object
 283          * @todo FIXME: Shouldn't this be public?
 284          * @private
 285          */
 286         public function clear() {
 287                 $this->mDataLoaded    = false;
 288                 $this->mContentLoaded = false;
 289
 290                 $this->mCounter = -1; # Not loaded
 291                 $this->mRedirectedFrom = null; # Title object if set
 292                 $this->mRedirectTarget = null; # Title object if set
 293                 $this->mLastRevision = null; # Latest revision
 294                 $this->mTimestamp = '';
 295                 $this->mTouched = '19700101000000';
 296                 $this->mIsRedirect = false;
 297                 $this->mRevIdFetched = 0;
 298                 $this->mRedirectUrl = false;
 299                 $this->mLatest = false;
 300                 $this->mPreparedEdit = false;
 301         }
 302
 303         /**
 304          * Note that getContent/loadContent do not follow redirects anymore.
 305          * If you need to fetch redirectable content easily, try
 306          * the shortcut in Article::followRedirect()
 307          *
 308          * This function has side effects! Do not use this function if you
 309          * only want the real revision text if any.
 310          *
 311          * @return Return the text of this revision
 312          */
 313         public function getContent() {
 314                 global $wgUser;
 315
 316                 wfProfileIn( __METHOD__ );
 317
 318                 if ( $this->getID() === 0 ) {
 319                         # If this is a MediaWiki:x message, then load the messages
 320                         # and return the message value for x.
 321                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 322                                 $text = $this->mTitle->getDefaultMessageText();
 323                                 if ( $text === false ) {
 324                                         $text = '';
 325                                 }
 326                         } else {
 327                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 328                         }
 329                         wfProfileOut( __METHOD__ );
 330
 331                         return $text;
 332                 } else {
 333                         $this->loadContent();
 334                         wfProfileOut( __METHOD__ );
 335
 336                         return $this->mContent;
 337                 }
 338         }
 339
 340         /**
 341          * Get the text of the current revision. No side-effects...
 342          *
 343          * @return Return the text of the current revision
 344          */
 345         public function getRawText() {
 346                 // Check process cache for current revision
 347                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 348                         return $this->mContent;
 349                 }
 350
 351                 $rev = Revision::newFromTitle( $this->mTitle );
 352                 $text = $rev ? $rev->getRawText() : false;
 353
 354                 return $text;
 355         }
 356
 357         /**
 358          * Get the text that needs to be saved in order to undo all revisions
 359          * between $undo and $undoafter. Revisions must belong to the same page,
 360          * must exist and must not be deleted
 361          * @param $undo Revision
 362          * @param $undoafter Revision Must be an earlier revision than $undo
 363          * @return mixed string on success, false on failure
 364          */
 365         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 366                 $cur_text = $this->getRawText();
 367                 if ( $cur_text === false ) {
 368                         return false; // no page
 369                 }
 370                 $undo_text = $undo->getText();
 371                 $undoafter_text = $undoafter->getText();
 372
 373                 if ( $cur_text == $undo_text ) {
 374                         # No use doing a merge if it's just a straight revert.
 375                         return $undoafter_text;
 376                 }
 377
 378                 $undone_text = '';
 379
 380                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 381                         return false;
 382                 }
 383
 384                 return $undone_text;
 385         }
 386
 387         /**
 388          * @return int The oldid of the article that is to be shown, 0 for the
 389          *             current revision
 390          */
 391         public function getOldID() {
 392                 if ( is_null( $this->mOldId ) ) {
 393                         $this->mOldId = $this->getOldIDFromRequest();
 394                 }
 395
 396                 return $this->mOldId;
 397         }
 398
 399         /**
 400          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 401          *
 402          * @return int The old id for the request
 403          */
 404         public function getOldIDFromRequest() {
 405                 global $wgRequest;
 406
 407                 $this->mRedirectUrl = false;
 408
 409                 $oldid = $wgRequest->getVal( 'oldid' );
 410
 411                 if ( isset( $oldid ) ) {
 412                         $oldid = intval( $oldid );
 413                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 414                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 415                                 if ( $nextid ) {
 416                                         $oldid = $nextid;
 417                                 } else {
 418                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 419                                 }
 420                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 421                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 422                                 if ( $previd ) {
 423                                         $oldid = $previd;
 424                                 }
 425                         }
 426                 }
 427
 428                 if ( !$oldid ) {
 429                         $oldid = 0;
 430                 }
 431
 432                 return $oldid;
 433         }
 434
 435         /**
 436          * Load the revision (including text) into this object
 437          */
 438         function loadContent() {
 439                 if ( $this->mContentLoaded ) {
 440                         return;
 441                 }
 442
 443                 wfProfileIn( __METHOD__ );
 444
 445                 $this->fetchContent( $this->getOldID() );
 446
 447                 wfProfileOut( __METHOD__ );
 448         }
 449
 450         /**
 451          * Return the list of revision fields that should be selected to create
 452          * a new page.
 453          */
 454         public static function selectFields() {
 455                 return array(
 456                         'page_id',
 457                         'page_namespace',
 458                         'page_title',
 459                         'page_restrictions',
 460                         'page_counter',
 461                         'page_is_redirect',
 462                         'page_is_new',
 463                         'page_random',
 464                         'page_touched',
 465                         'page_latest',
 466                         'page_len',
 467                 );
 468         }
 469
 470         /**
 471          * Fetch a page record with the given conditions
 472          * @param $dbr DatabaseBase object
 473          * @param $conditions Array
 474          * @return mixed Database result resource, or false on failure
 475          */
 476         protected function pageData( $dbr, $conditions ) {
 477                 $fields = self::selectFields();
 478
 479                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 480
 481                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 482
 483                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 484
 485                 return $row;
 486         }
 487
 488         /**
 489          * Fetch a page record matching the Title object's namespace and title
 490          * using a sanitized title string
 491          *
 492          * @param $dbr DatabaseBase object
 493          * @param $title Title object
 494          * @return mixed Database result resource, or false on failure
 495          */
 496         protected function pageDataFromTitle( $dbr, $title ) {
 497                 return $this->pageData( $dbr, array(
 498                         'page_namespace' => $title->getNamespace(),
 499                         'page_title'     => $title->getDBkey() ) );
 500         }
 501
 502         /**
 503          * Fetch a page record matching the requested ID
 504          *
 505          * @param $dbr DatabaseBase
 506          * @param $id Integer
 507          * @return mixed Database result resource, or false on failure
 508          */
 509         protected function pageDataFromId( $dbr, $id ) {
 510                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 511         }
 512
 513         /**
 514          * Set the general counter, title etc data loaded from
 515          * some source.
 516          *
 517          * @param $data Object|String $res->fetchObject() object or the string "fromdb" to reload
 518          */
 519         public function loadPageData( $data = 'fromdb' ) {
 520                 if ( $data === 'fromdb' ) {
 521                         $dbr = wfGetDB( DB_SLAVE );
 522                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 523                 }
 524
 525                 $lc = LinkCache::singleton();
 526
 527                 if ( $data ) {
 528                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 529
 530                         $this->mTitle->mArticleID = intval( $data->page_id );
 531
 532                         # Old-fashioned restrictions
 533                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 534
 535                         $this->mCounter     = intval( $data->page_counter );
 536                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 537                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 538                         $this->mLatest      = intval( $data->page_latest );
 539                 } else {
 540                         $lc->addBadLinkObj( $this->mTitle );
 541                         $this->mTitle->mArticleID = 0;
 542                 }
 543
 544                 $this->mDataLoaded = true;
 545         }
 546
 547         /**
 548          * Get text of an article from database
 549          * Does *NOT* follow redirects.
 550          *
 551          * @param $oldid Int: 0 for whatever the latest revision is
 552          * @return mixed string containing article contents, or false if null
 553          */
 554         function fetchContent( $oldid = 0 ) {
 555                 if ( $this->mContentLoaded ) {
 556                         return $this->mContent;
 557                 }
 558
 559                 # Pre-fill content with error message so that if something
 560                 # fails we'll have something telling us what we intended.
 561                 $t = $this->mTitle->getPrefixedText();
 562                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 563                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 564
 565                 if ( $oldid ) {
 566                         $revision = Revision::newFromId( $oldid );
 567                         if ( $revision === null ) {
 568                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 569                                 return false;
 570                         }
 571
 572                         if ( !$this->mDataLoaded || $this->getID() != $revision->getPage() ) {
 573                                 $data = $this->pageDataFromId( wfGetDB( DB_SLAVE ), $revision->getPage() );
 574
 575                                 if ( !$data ) {
 576                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 577                                         return false;
 578                                 }
 579
 580                                 $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 581                                 $this->loadPageData( $data );
 582                         }
 583                 } else {
 584                         if ( !$this->mDataLoaded ) {
 585                                 $this->loadPageData();
 586                         }
 587
 588                         if ( $this->mLatest === false ) {
 589                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 590                                 return false;
 591                         }
 592
 593                         $revision = Revision::newFromId( $this->mLatest );
 594                         if ( $revision === null ) {
 595                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 596                                 return false;
 597                         }
 598                 }
 599
 600                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 601                 // We should instead work with the Revision object when we need it...
 602                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 603
 604                 if ( $revision->getId() == $this->mLatest ) {
 605                         $this->setLastEdit( $revision );
 606                 }
 607
 608                 $this->mRevIdFetched = $revision->getId();
 609                 $this->mContentLoaded = true;
 610                 $this->mRevision =& $revision;
 611
 612                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 613
 614                 return $this->mContent;
 615         }
 616
 617         /**
 618          * No-op
 619          * @deprecated since 1.18
 620          */
 621         public function forUpdate() {
 622                 wfDeprecated( __METHOD__ );
 623         }
 624
 625         /**
 626          * @return int Page ID
 627          */
 628         public function getID() {
 629                 return $this->mTitle->getArticleID();
 630         }
 631
 632         /**
 633          * @return bool Whether or not the page exists in the database
 634          */
 635         public function exists() {
 636                 return $this->getId() > 0;
 637         }
 638
 639         /**
 640          * Check if this page is something we're going to be showing
 641          * some sort of sensible content for. If we return false, page
 642          * views (plain action=view) will return an HTTP 404 response,
 643          * so spiders and robots can know they're following a bad link.
 644          *
 645          * @return bool
 646          */
 647         public function hasViewableContent() {
 648                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 649         }
 650
 651         /**
 652          * @return int The view count for the page
 653          */
 654         public function getCount() {
 655                 if ( -1 == $this->mCounter ) {
 656                         $id = $this->getID();
 657
 658                         if ( $id == 0 ) {
 659                                 $this->mCounter = 0;
 660                         } else {
 661                                 $dbr = wfGetDB( DB_SLAVE );
 662                                 $this->mCounter = $dbr->selectField( 'page',
 663                                         'page_counter',
 664                                         array( 'page_id' => $id ),
 665                                         __METHOD__
 666                                 );
 667                         }
 668                 }
 669
 670                 return $this->mCounter;
 671         }
 672
 673         /**
 674          * Determine whether a page would be suitable for being counted as an
 675          * article in the site_stats table based on the title & its content
 676          *
 677          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 678          *        if false, the current database state will be used
 679          * @return Boolean
 680          */
 681         public function isCountable( $editInfo = false ) {
 682                 global $wgArticleCountMethod;
 683
 684                 if ( !$this->mTitle->isContentPage() ) {
 685                         return false;
 686                 }
 687
 688                 $text = $editInfo ? $editInfo->pst : false;
 689
 690                 if ( $this->isRedirect( $text ) ) {
 691                         return false;
 692                 }
 693
 694                 switch ( $wgArticleCountMethod ) {
 695                 case 'any':
 696                         return true;
 697                 case 'comma':
 698                         if ( $text === false ) {
 699                                 $text = $this->getRawText();
 700                         }
 701                         return strpos( $text,  ',' ) !== false;
 702                 case 'link':
 703                         if ( $editInfo ) {
 704                                 // ParserOutput::getLinks() is a 2D array of page links, so
 705                                 // to be really correct we would need to recurse in the array
 706                                 // but the main array should only have items in it if there are
 707                                 // links.
 708                                 return (bool)count( $editInfo->output->getLinks() );
 709                         } else {
 710                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 711                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 712                         }
 713                 }
 714         }
 715
 716         /**
 717          * Tests if the article text represents a redirect
 718          *
 719          * @param $text mixed string containing article contents, or boolean
 720          * @return bool
 721          */
 722         public function isRedirect( $text = false ) {
 723                 if ( $text === false ) {
 724                         if ( !$this->mDataLoaded ) {
 725                                 $this->loadPageData();
 726                         }
 727
 728                         return (bool)$this->mIsRedirect;
 729                 } else {
 730                         return Title::newFromRedirect( $text ) !== null;
 731                 }
 732         }
 733
 734         /**
 735          * Returns true if the currently-referenced revision is the current edit
 736          * to this page (and it exists).
 737          * @return bool
 738          */
 739         public function isCurrent() {
 740                 # If no oldid, this is the current version.
 741                 if ( $this->getOldID() == 0 ) {
 742                         return true;
 743                 }
 744
 745                 return $this->exists() && $this->mRevision && $this->mRevision->isCurrent();
 746         }
 747
 748         /**
 749          * Loads everything except the text
 750          * This isn't necessary for all uses, so it's only done if needed.
 751          */
 752         protected function loadLastEdit() {
 753                 if ( $this->mLastRevision !== null ) {
 754                         return; // already loaded
 755                 }
 756
 757                 # New or non-existent articles have no user information
 758                 $id = $this->getID();
 759                 if ( 0 == $id ) {
 760                         return;
 761                 }
 762
 763                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 764                 if ( $revision ) {
 765                         $this->setLastEdit( $revision );
 766                 }
 767         }
 768
 769         /**
 770          * Set the latest revision
 771          */
 772         protected function setLastEdit( Revision $revision ) {
 773                 $this->mLastRevision = $revision;
 774                 $this->mTimestamp = $revision->getTimestamp();
 775         }
 776
 777         /**
 778          * @return string GMT timestamp of last article revision
 779          */
 780         public function getTimestamp() {
 781                 // Check if the field has been filled by ParserCache::get()
 782                 if ( !$this->mTimestamp ) {
 783                         $this->loadLastEdit();
 784                 }
 785                 return wfTimestamp( TS_MW, $this->mTimestamp );
 786         }
 787
 788         /**
 789          * @param $audience Integer: one of:
 790          *      Revision::FOR_PUBLIC       to be displayed to all users
 791          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 792          *      Revision::RAW              get the text regardless of permissions
 793          * @return int user ID for the user that made the last article revision
 794          */
 795         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 796                 $this->loadLastEdit();
 797                 if ( $this->mLastRevision ) {
 798                         return $this->mLastRevision->getUser( $audience );
 799                 } else {
 800                         return -1;
 801                 }
 802         }
 803
 804         /**
 805          * @param $audience Integer: one of:
 806          *      Revision::FOR_PUBLIC       to be displayed to all users
 807          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 808          *      Revision::RAW              get the text regardless of permissions
 809          * @return string username of the user that made the last article revision
 810          */
 811         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 812                 $this->loadLastEdit();
 813                 if ( $this->mLastRevision ) {
 814                         return $this->mLastRevision->getUserText( $audience );
 815                 } else {
 816                         return '';
 817                 }
 818         }
 819
 820         /**
 821          * @param $audience Integer: one of:
 822          *      Revision::FOR_PUBLIC       to be displayed to all users
 823          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 824          *      Revision::RAW              get the text regardless of permissions
 825          * @return string Comment stored for the last article revision
 826          */
 827         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 828                 $this->loadLastEdit();
 829                 if ( $this->mLastRevision ) {
 830                         return $this->mLastRevision->getComment( $audience );
 831                 } else {
 832                         return '';
 833                 }
 834         }
 835
 836         /**
 837          * Returns true if last revision was marked as "minor edit"
 838          *
 839          * @return boolean Minor edit indicator for the last article revision.
 840          */
 841         public function getMinorEdit() {
 842                 $this->loadLastEdit();
 843                 if ( $this->mLastRevision ) {
 844                         return $this->mLastRevision->isMinor();
 845                 } else {
 846                         return false;
 847                 }
 848         }
 849
 850         /**
 851          * Use this to fetch the rev ID used on page views
 852          *
 853          * @return int revision ID of last article revision
 854          */
 855         public function getRevIdFetched() {
 856                 if ( $this->mRevIdFetched ) {
 857                         return $this->mRevIdFetched;
 858                 } else {
 859                         return $this->getLatest();
 860                 }
 861         }
 862
 863         /**
 864          * Get a list of users who have edited this article, not including the user who made
 865          * the most recent revision, which you can get from $article->getUser() if you want it
 866          * @return UserArrayFromResult
 867          */
 868         public function getContributors() {
 869                 # @todo FIXME: This is expensive; cache this info somewhere.
 870
 871                 $dbr = wfGetDB( DB_SLAVE );
 872
 873                 if ( $dbr->implicitGroupby() ) {
 874                         $realNameField = 'user_real_name';
 875                 } else {
 876                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 877                 }
 878
 879                 $tables = array( 'revision', 'user' );
 880
 881                 $fields = array(
 882                         'rev_user as user_id',
 883                         'rev_user_text AS user_name',
 884                         $realNameField,
 885                         'MAX(rev_timestamp) AS timestamp',
 886                 );
 887
 888                 $conds = array( 'rev_page' => $this->getId() );
 889
 890                 // The user who made the top revision gets credited as "this page was last edited by
 891                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 892                 $user = $this->getUser();
 893                 if ( $user ) {
 894                         $conds[] = "rev_user != $user";
 895                 } else {
 896                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 897                 }
 898
 899                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 900
 901                 $jconds = array(
 902                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 903                 );
 904
 905                 $options = array(
 906                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 907                         'ORDER BY' => 'timestamp DESC',
 908                 );
 909
 910                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 911                 return new UserArrayFromResult( $res );
 912         }
 913
 914         /**
 915          * This is the default action of the index.php entry point: just view the
 916          * page of the given title.
 917          */
 918         public function view() {
 919                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 920                 global $wgUseFileCache, $wgUseETag;
 921
 922                 wfProfileIn( __METHOD__ );
 923
 924                 # Get variables from query string
 925                 $oldid = $this->getOldID();
 926
 927                 # getOldID may want us to redirect somewhere else
 928                 if ( $this->mRedirectUrl ) {
 929                         $wgOut->redirect( $this->mRedirectUrl );
 930                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 931                         wfProfileOut( __METHOD__ );
 932
 933                         return;
 934                 }
 935
 936                 $wgOut->setArticleFlag( true );
 937                 # Set page title (may be overridden by DISPLAYTITLE)
 938                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 939
 940                 # If we got diff in the query, we want to see a diff page instead of the article.
 941                 if ( $wgRequest->getCheck( 'diff' ) ) {
 942                         wfDebug( __METHOD__ . ": showing diff page\n" );
 943                         $this->showDiffPage();
 944                         wfProfileOut( __METHOD__ );
 945
 946                         return;
 947                 }
 948
 949                 # Allow frames by default
 950                 $wgOut->allowClickjacking();
 951
 952                 $parserCache = ParserCache::singleton();
 953
 954                 $parserOptions = $this->getParserOptions();
 955                 # Render printable version, use printable version cache
 956                 if ( $wgOut->isPrintable() ) {
 957                         $parserOptions->setIsPrintable( true );
 958                         $parserOptions->setEditSection( false );
 959                 } elseif ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 960                         $parserOptions->setEditSection( false );
 961                 }
 962
 963                 # Try client and file cache
 964                 if ( $oldid === 0 && $this->checkTouched() ) {
 965                         if ( $wgUseETag ) {
 966                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 967                         }
 968
 969                         # Is it client cached?
 970                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 971                                 wfDebug( __METHOD__ . ": done 304\n" );
 972                                 wfProfileOut( __METHOD__ );
 973
 974                                 return;
 975                         # Try file cache
 976                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 977                                 wfDebug( __METHOD__ . ": done file cache\n" );
 978                                 # tell wgOut that output is taken care of
 979                                 $wgOut->disable();
 980                                 $this->viewUpdates();
 981                                 wfProfileOut( __METHOD__ );
 982
 983                                 return;
 984                         }
 985                 }
 986
 987                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 988                         $parserOptions->setEditSection( false );
 989                 }
 990
 991                 # Should the parser cache be used?
 992                 $useParserCache = $this->useParserCache( $oldid );
 993                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 994                 if ( $wgUser->getStubThreshold() ) {
 995                         wfIncrStats( 'pcache_miss_stub' );
 996                 }
 997
 998                 $wasRedirected = $this->showRedirectedFromHeader();
 999                 $this->showNamespaceHeader();
1000
1001                 # Iterate through the possible ways of constructing the output text.
1002                 # Keep going until $outputDone is set, or we run out of things to do.
1003                 $pass = 0;
1004                 $outputDone = false;
1005                 $this->mParserOutput = false;
1006
1007                 while ( !$outputDone && ++$pass ) {
1008                         switch( $pass ) {
1009                                 case 1:
1010                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
1011                                         break;
1012                                 case 2:
1013                                         # Try the parser cache
1014                                         if ( $useParserCache ) {
1015                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
1016
1017                                                 if ( $this->mParserOutput !== false ) {
1018                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
1019                                                         $wgOut->addParserOutput( $this->mParserOutput );
1020                                                         # Ensure that UI elements requiring revision ID have
1021                                                         # the correct version information.
1022                                                         $wgOut->setRevisionId( $this->mLatest );
1023                                                         $outputDone = true;
1024                                                 }
1025                                         }
1026                                         break;
1027                                 case 3:
1028                                         $text = $this->getContent();
1029                                         if ( $text === false || $this->getID() == 0 ) {
1030                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
1031                                                 $this->showMissingArticle();
1032                                                 wfProfileOut( __METHOD__ );
1033                                                 return;
1034                                         }
1035
1036                                         # Another whitelist check in case oldid is altering the title
1037                                         if ( !$this->mTitle->userCanRead() ) {
1038                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
1039                                                 $wgOut->loginToUse();
1040                                                 $wgOut->output();
1041                                                 $wgOut->disable();
1042                                                 wfProfileOut( __METHOD__ );
1043                                                 return;
1044                                         }
1045
1046                                         # Are we looking at an old revision
1047                                         if ( $oldid && !is_null( $this->mRevision ) ) {
1048                                                 $this->setOldSubtitle( $oldid );
1049
1050                                                 if ( !$this->showDeletedRevisionHeader() ) {
1051                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
1052                                                         wfProfileOut( __METHOD__ );
1053                                                         return;
1054                                                 }
1055
1056                                                 # If this "old" version is the current, then try the parser cache...
1057                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
1058                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
1059                                                         if ( $this->mParserOutput ) {
1060                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
1061                                                                 $wgOut->addParserOutput( $this->mParserOutput );
1062                                                                 $wgOut->setRevisionId( $this->mLatest );
1063                                                                 $outputDone = true;
1064                                                                 break;
1065                                                         }
1066                                                 }
1067                                         }
1068
1069                                         # Ensure that UI elements requiring revision ID have
1070                                         # the correct version information.
1071                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
1072
1073                                         # Pages containing custom CSS or JavaScript get special treatment
1074                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
1075                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
1076                                                 $this->showCssOrJsPage();
1077                                                 $outputDone = true;
1078                                         } else {
1079                                                 $rt = Title::newFromRedirectArray( $text );
1080                                                 if ( $rt ) {
1081                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
1082                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
1083                                                         # Don't append the subtitle if this was an old revision
1084                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
1085                                                         # Parse just to get categories, displaytitle, etc.
1086                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
1087                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
1088                                                         $outputDone = true;
1089                                                 }
1090                                         }
1091                                         break;
1092                                 case 4:
1093                                         # Run the parse, protected by a pool counter
1094                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1095
1096                                         $key = $parserCache->getKey( $this, $parserOptions );
1097                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1098
1099                                         if ( !$poolArticleView->execute() ) {
1100                                                 # Connection or timeout error
1101                                                 wfProfileOut( __METHOD__ );
1102                                                 return;
1103                                         } else {
1104                                                 $outputDone = true;
1105                                         }
1106                                         break;
1107                                 # Should be unreachable, but just in case...
1108                                 default:
1109                                         break 2;
1110                         }
1111                 }
1112
1113                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1114                 if ( $this->mParserOutput ) {
1115                         $titleText = $this->mParserOutput->getTitleText();
1116
1117                         if ( strval( $titleText ) !== '' ) {
1118                                 $wgOut->setPageTitle( $titleText );
1119                         }
1120                 }
1121
1122                 # For the main page, overwrite the <title> element with the con-
1123                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1124                 # that's not empty).
1125                 # This message always exists because it is in the i18n files
1126                 if ( $this->mTitle->equals( Title::newMainPage() ) ) {
1127                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
1128                         if ( !$msg->isDisabled() ) {
1129                                 $wgOut->setHTMLTitle( $msg->title( $this->mTitle )->text() );
1130                         }
1131                 }
1132
1133                 # Now that we've filled $this->mParserOutput, we know whether
1134                 # there are any __NOINDEX__ tags on the page
1135                 $policy = $this->getRobotPolicy( 'view' );
1136                 $wgOut->setIndexPolicy( $policy['index'] );
1137                 $wgOut->setFollowPolicy( $policy['follow'] );
1138
1139                 $this->showViewFooter();
1140                 $this->viewUpdates();
1141                 wfProfileOut( __METHOD__ );
1142         }
1143
1144         /**
1145          * Show a diff page according to current request variables. For use within
1146          * Article::view() only, other callers should use the DifferenceEngine class.
1147          */
1148         public function showDiffPage() {
1149                 global $wgRequest, $wgUser;
1150
1151                 $diff = $wgRequest->getVal( 'diff' );
1152                 $rcid = $wgRequest->getVal( 'rcid' );
1153                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1154                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1155                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1156                 $oldid = $this->getOldID();
1157
1158                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1159                 // DifferenceEngine directly fetched the revision:
1160                 $this->mRevIdFetched = $de->mNewid;
1161                 $de->showDiffPage( $diffOnly );
1162
1163                 if ( $diff == 0 || $diff == $this->getLatest() ) {
1164                         # Run view updates for current revision only
1165                         $this->viewUpdates();
1166                 }
1167         }
1168
1169         /**
1170          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1171          * Article::view() only.
1172          *
1173          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1174          * page views.
1175          */
1176         protected function showCssOrJsPage() {
1177                 global $wgOut;
1178
1179                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1180
1181                 // Give hooks a chance to customise the output
1182                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1183                         // Wrap the whole lot in a <pre> and don't parse
1184                         $m = array();
1185                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1186                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1187                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1188                         $wgOut->addHTML( "\n</pre>\n" );
1189                 }
1190         }
1191
1192         /**
1193          * Get the robot policy to be used for the current view
1194          * @param $action String the action= GET parameter
1195          * @return Array the policy that should be set
1196          * TODO: actions other than 'view'
1197          */
1198         public function getRobotPolicy( $action ) {
1199                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1200                 global $wgDefaultRobotPolicy, $wgRequest;
1201
1202                 $ns = $this->mTitle->getNamespace();
1203
1204                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1205                         # Don't index user and user talk pages for blocked users (bug 11443)
1206                         if ( !$this->mTitle->isSubpage() ) {
1207                                 if ( Block::newFromTarget( null, $this->mTitle->getText() ) instanceof Block ) {
1208                                         return array(
1209                                                 'index'  => 'noindex',
1210                                                 'follow' => 'nofollow'
1211                                         );
1212                                 }
1213                         }
1214                 }
1215
1216                 if ( $this->getID() === 0 || $this->getOldID() ) {
1217                         # Non-articles (special pages etc), and old revisions
1218                         return array(
1219                                 'index'  => 'noindex',
1220                                 'follow' => 'nofollow'
1221                         );
1222                 } elseif ( $wgOut->isPrintable() ) {
1223                         # Discourage indexing of printable versions, but encourage following
1224                         return array(
1225                                 'index'  => 'noindex',
1226                                 'follow' => 'follow'
1227                         );
1228                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1229                         # For ?curid=x urls, disallow indexing
1230                         return array(
1231                                 'index'  => 'noindex',
1232                                 'follow' => 'follow'
1233                         );
1234                 }
1235
1236                 # Otherwise, construct the policy based on the various config variables.
1237                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1238
1239                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1240                         # Honour customised robot policies for this namespace
1241                         $policy = array_merge(
1242                                 $policy,
1243                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1244                         );
1245                 }
1246                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1247                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1248                         # a final sanity check that we have really got the parser output.
1249                         $policy = array_merge(
1250                                 $policy,
1251                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1252                         );
1253                 }
1254
1255                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1256                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1257                         $policy = array_merge(
1258                                 $policy,
1259                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1260                         );
1261                 }
1262
1263                 return $policy;
1264         }
1265
1266         /**
1267          * Converts a String robot policy into an associative array, to allow
1268          * merging of several policies using array_merge().
1269          * @param $policy Mixed, returns empty array on null/false/'', transparent
1270          *            to already-converted arrays, converts String.
1271          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1272          */
1273         public static function formatRobotPolicy( $policy ) {
1274                 if ( is_array( $policy ) ) {
1275                         return $policy;
1276                 } elseif ( !$policy ) {
1277                         return array();
1278                 }
1279
1280                 $policy = explode( ',', $policy );
1281                 $policy = array_map( 'trim', $policy );
1282
1283                 $arr = array();
1284                 foreach ( $policy as $var ) {
1285                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1286                                 $arr['index'] = $var;
1287                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1288                                 $arr['follow'] = $var;
1289                         }
1290                 }
1291
1292                 return $arr;
1293         }
1294
1295         /**
1296          * If this request is a redirect view, send "redirected from" subtitle to
1297          * $wgOut. Returns true if the header was needed, false if this is not a
1298          * redirect view. Handles both local and remote redirects.
1299          *
1300          * @return boolean
1301          */
1302         public function showRedirectedFromHeader() {
1303                 global $wgOut, $wgRequest, $wgRedirectSources;
1304
1305                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1306
1307                 if ( isset( $this->mRedirectedFrom ) ) {
1308                         // This is an internally redirected page view.
1309                         // We'll need a backlink to the source page for navigation.
1310                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1311                                 $redir = Linker::link(
1312                                         $this->mRedirectedFrom,
1313                                         null,
1314                                         array(),
1315                                         array( 'redirect' => 'no' ),
1316                                         array( 'known', 'noclasses' )
1317                                 );
1318
1319                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1320                                 $wgOut->setSubtitle( $s );
1321
1322                                 // Set the fragment if one was specified in the redirect
1323                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1324                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1325                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1326                                 }
1327
1328                                 // Add a <link rel="canonical"> tag
1329                                 $wgOut->addLink( array( 'rel' => 'canonical',
1330                                         'href' => $this->mTitle->getLocalURL() )
1331                                 );
1332
1333                                 return true;
1334                         }
1335                 } elseif ( $rdfrom ) {
1336                         // This is an externally redirected view, from some other wiki.
1337                         // If it was reported from a trusted site, supply a backlink.
1338                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1339                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1340                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1341                                 $wgOut->setSubtitle( $s );
1342
1343                                 return true;
1344                         }
1345                 }
1346
1347                 return false;
1348         }
1349
1350         /**
1351          * Show a header specific to the namespace currently being viewed, like
1352          * [[MediaWiki:Talkpagetext]]. For Article::view().
1353          */
1354         public function showNamespaceHeader() {
1355                 global $wgOut;
1356
1357                 if ( $this->mTitle->isTalkPage() ) {
1358                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1359                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1360                         }
1361                 }
1362         }
1363
1364         /**
1365          * Show the footer section of an ordinary page view
1366          */
1367         public function showViewFooter() {
1368                 global $wgOut, $wgUseTrackbacks;
1369
1370                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1371                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1372                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1373                 }
1374
1375                 # If we have been passed an &rcid= parameter, we want to give the user a
1376                 # chance to mark this new article as patrolled.
1377                 $this->showPatrolFooter();
1378
1379                 # Trackbacks
1380                 if ( $wgUseTrackbacks ) {
1381                         $this->addTrackbacks();
1382                 }
1383
1384                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1385
1386         }
1387
1388         /**
1389          * If patrol is possible, output a patrol UI box. This is called from the
1390          * footer section of ordinary page views. If patrol is not possible or not
1391          * desired, does nothing.
1392          */
1393         public function showPatrolFooter() {
1394                 global $wgOut, $wgRequest, $wgUser;
1395
1396                 $rcid = $wgRequest->getVal( 'rcid' );
1397
1398                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1399                         return;
1400                 }
1401
1402                 $token = $wgUser->editToken( $rcid );
1403                 $wgOut->preventClickjacking();
1404
1405                 $wgOut->addHTML(
1406                         "<div class='patrollink'>" .
1407                                 wfMsgHtml(
1408                                         'markaspatrolledlink',
1409                                         Linker::link(
1410                                                 $this->mTitle,
1411                                                 wfMsgHtml( 'markaspatrolledtext' ),
1412                                                 array(),
1413                                                 array(
1414                                                         'action' => 'markpatrolled',
1415                                                         'rcid' => $rcid,
1416                                                         'token' => $token,
1417                                                 ),
1418                                                 array( 'known', 'noclasses' )
1419                                         )
1420                                 ) .
1421                         '</div>'
1422                 );
1423         }
1424
1425         /**
1426          * Show the error text for a missing article. For articles in the MediaWiki
1427          * namespace, show the default message text. To be called from Article::view().
1428          */
1429         public function showMissingArticle() {
1430                 global $wgOut, $wgRequest, $wgUser;
1431
1432                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1433                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1434                         $parts = explode( '/', $this->mTitle->getText() );
1435                         $rootPart = $parts[0];
1436                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1437                         $ip = User::isIP( $rootPart );
1438
1439                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1440                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1441                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1442                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1443                                 LogEventsList::showLogExtract(
1444                                         $wgOut,
1445                                         'block',
1446                                         $user->getUserPage()->getPrefixedText(),
1447                                         '',
1448                                         array(
1449                                                 'lim' => 1,
1450                                                 'showIfEmpty' => false,
1451                                                 'msgKey' => array(
1452                                                         'blocked-notice-logextract',
1453                                                         $user->getName() # Support GENDER in notice
1454                                                 )
1455                                         )
1456                                 );
1457                         }
1458                 }
1459
1460                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1461
1462                 # Show delete and move logs
1463                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1464                         array(  'lim' => 10,
1465                                 'conds' => array( "log_action != 'revision'" ),
1466                                 'showIfEmpty' => false,
1467                                 'msgKey' => array( 'moveddeleted-notice' ) )
1468                 );
1469
1470                 # Show error message
1471                 $oldid = $this->getOldID();
1472                 if ( $oldid ) {
1473                         $text = wfMsgNoTrans( 'missing-article',
1474                                 $this->mTitle->getPrefixedText(),
1475                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1476                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1477                         // Use the default message text
1478                         $text = $this->mTitle->getDefaultMessageText();
1479                 } else {
1480                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1481                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1482                         $errors = array_merge( $createErrors, $editErrors );
1483
1484                         if ( !count( $errors ) ) {
1485                                 $text = wfMsgNoTrans( 'noarticletext' );
1486                         } else {
1487                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1488                         }
1489                 }
1490                 $text = "<div class='noarticletext'>\n$text\n</div>";
1491
1492                 if ( !$this->hasViewableContent() ) {
1493                         // If there's no backing content, send a 404 Not Found
1494                         // for better machine handling of broken links.
1495                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
1496                 }
1497
1498                 $wgOut->addWikiText( $text );
1499         }
1500
1501         /**
1502          * If the revision requested for view is deleted, check permissions.
1503          * Send either an error message or a warning header to $wgOut.
1504          *
1505          * @return boolean true if the view is allowed, false if not.
1506          */
1507         public function showDeletedRevisionHeader() {
1508                 global $wgOut, $wgRequest;
1509
1510                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1511                         // Not deleted
1512                         return true;
1513                 }
1514
1515                 // If the user is not allowed to see it...
1516                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1517                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1518                                 'rev-deleted-text-permission' );
1519
1520                         return false;
1521                 // If the user needs to confirm that they want to see it...
1522                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1523                         # Give explanation and add a link to view the revision...
1524                         $oldid = intval( $this->getOldID() );
1525                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1526                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1527                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1528                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1529                                 array( $msg, $link ) );
1530
1531                         return false;
1532                 // We are allowed to see...
1533                 } else {
1534                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1535                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1536                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1537
1538                         return true;
1539                 }
1540         }
1541
1542         /**
1543          * Should the parser cache be used?
1544          *
1545          * @return boolean
1546          */
1547         public function useParserCache( $oldid ) {
1548                 global $wgUser, $wgEnableParserCache;
1549
1550                 return $wgEnableParserCache
1551                         && $wgUser->getStubThreshold() == 0
1552                         && $this->exists()
1553                         && empty( $oldid )
1554                         && !$this->mTitle->isCssOrJsPage()
1555                         && !$this->mTitle->isCssJsSubpage();
1556         }
1557
1558         /**
1559          * Execute the uncached parse for action=view
1560          */
1561         public function doViewParse() {
1562                 global $wgOut;
1563
1564                 $oldid = $this->getOldID();
1565                 $parserOptions = $this->getParserOptions();
1566
1567                 # Render printable version, use printable version cache
1568                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1569
1570                 # Don't show section-edit links on old revisions... this way lies madness.
1571                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1572                         $parserOptions->setEditSection( false );
1573                 }
1574
1575                 $useParserCache = $this->useParserCache( $oldid );
1576                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1577
1578                 return true;
1579         }
1580
1581         /**
1582          * Try to fetch an expired entry from the parser cache. If it is present,
1583          * output it and return true. If it is not present, output nothing and
1584          * return false. This is used as a callback function for
1585          * PoolCounter::executeProtected().
1586          *
1587          * @return boolean
1588          */
1589         public function tryDirtyCache() {
1590                 global $wgOut;
1591                 $parserCache = ParserCache::singleton();
1592                 $options = $this->getParserOptions();
1593
1594                 if ( $wgOut->isPrintable() ) {
1595                         $options->setIsPrintable( true );
1596                         $options->setEditSection( false );
1597                 }
1598
1599                 $output = $parserCache->getDirty( $this, $options );
1600
1601                 if ( $output ) {
1602                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1603                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1604                         $wgOut->setSquidMaxage( 0 );
1605                         $this->mParserOutput = $output;
1606                         $wgOut->addParserOutput( $output );
1607                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1608
1609                         return true;
1610                 } else {
1611                         wfDebugLog( 'dirty', "dirty missing\n" );
1612                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1613
1614                         return false;
1615                 }
1616         }
1617
1618         /**
1619          * View redirect
1620          *
1621          * @param $target Title|Array of destination(s) to redirect
1622          * @param $appendSubtitle Boolean [optional]
1623          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1624          * @return string containing HMTL with redirect link
1625          */
1626         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1627                 global $wgOut, $wgStylePath;
1628
1629                 if ( !is_array( $target ) ) {
1630                         $target = array( $target );
1631                 }
1632
1633                 $imageDir = wfUILang()->getDir();
1634
1635                 if ( $appendSubtitle ) {
1636                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1637                 }
1638
1639                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1640                 $title = array_shift( $target );
1641
1642                 if ( $forceKnown ) {
1643                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1644                 } else {
1645                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1646                 }
1647
1648                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1649                 $alt = wfUILang()->isRTL() ? '←' : '→';
1650                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1651                 foreach ( $target as $rt ) {
1652                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1653                         if ( $forceKnown ) {
1654                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1655                         } else {
1656                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1657                         }
1658                 }
1659
1660                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1661                 return '<div class="redirectMsg">' .
1662                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1663                         '<span class="redirectText">' . $link . '</span></div>';
1664         }
1665
1666         /**
1667          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1668          */
1669         public function addTrackbacks() {
1670                 global $wgOut;
1671
1672                 $dbr = wfGetDB( DB_SLAVE );
1673                 $tbs = $dbr->select( 'trackbacks',
1674                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1675                         array( 'tb_page' => $this->getID() )
1676                 );
1677
1678                 if ( !$dbr->numRows( $tbs ) ) {
1679                         return;
1680                 }
1681
1682                 $wgOut->preventClickjacking();
1683
1684                 $tbtext = "";
1685                 foreach ( $tbs as $o ) {
1686                         $rmvtxt = "";
1687
1688                         if ( $wgOut->getUser()->isAllowed( 'trackback' ) ) {
1689                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1690                                         $o->tb_id . "&token=" . urlencode( $wgOut->getUser()->editToken() ) );
1691                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1692                         }
1693
1694                         $tbtext .= "\n";
1695                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1696                                         $o->tb_title,
1697                                         $o->tb_url,
1698                                         $o->tb_ex,
1699                                         $o->tb_name,
1700                                         $rmvtxt );
1701                 }
1702
1703                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1704         }
1705
1706         /**
1707          * Removes trackback record for current article from trackbacks table
1708          * @deprecated since 1.19
1709          */
1710         public function deletetrackback() {
1711                 return Action::factory( 'deletetrackback', $this )->show();
1712         }
1713
1714         /**
1715          * Handle action=render
1716          */
1717
1718         public function render() {
1719                 global $wgOut;
1720
1721                 $wgOut->setArticleBodyOnly( true );
1722                 $this->view();
1723         }
1724
1725         /**
1726          * Handle action=purge
1727          */
1728         public function purge() {
1729                 return Action::factory( 'purge', $this )->show();
1730         }
1731
1732         /**
1733          * Perform the actions of a page purging
1734          */
1735         public function doPurge() {
1736                 global $wgUseSquid;
1737
1738                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1739                         return false;
1740                 }
1741
1742                 // Invalidate the cache
1743                 $this->mTitle->invalidateCache();
1744                 $this->clear();
1745
1746                 if ( $wgUseSquid ) {
1747                         // Commit the transaction before the purge is sent
1748                         $dbw = wfGetDB( DB_MASTER );
1749                         $dbw->commit();
1750
1751                         // Send purge
1752                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1753                         $update->doUpdate();
1754                 }
1755
1756                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1757                         if ( $this->getID() == 0 ) {
1758                                 $text = false;
1759                         } else {
1760                                 $text = $this->getRawText();
1761                         }
1762
1763                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1764                 }
1765         }
1766
1767         /**
1768          * Mark this particular edit/page as patrolled
1769          * @deprecated since 1.19
1770          */
1771         public function markpatrolled() {
1772                 Action::factory( 'markpatrolled', $this )->show();
1773         }
1774
1775         /**
1776          * User-interface handler for the "watch" action.
1777          * Requires Request to pass a token as of 1.19.
1778          * @deprecated since 1.18
1779          */
1780         public function watch() {
1781                 Action::factory( 'watch', $this )->show();
1782         }
1783
1784         /**
1785          * Add this page to $wgUser's watchlist
1786          *
1787          * This is safe to be called multiple times
1788          *
1789          * @return bool true on successful watch operation
1790          * @deprecated since 1.18
1791          */
1792         public function doWatch() {
1793                 global $wgUser;
1794                 return WatchAction::doWatch( $this->mTitle, $wgUser );
1795         }
1796
1797         /**
1798          * User interface handler for the "unwatch" action.
1799          * Requires Request to pass a token as of 1.19.
1800          * @deprecated since 1.18
1801          */
1802         public function unwatch() {
1803                 Action::factory( 'unwatch', $this )->show();
1804         }
1805
1806         /**
1807          * Stop watching a page
1808          * @return bool true on successful unwatch
1809          * @deprecated since 1.18
1810          */
1811         public function doUnwatch() {
1812                 global $wgUser;
1813                 return WatchAction::doUnwatch( $this->mTitle, $wgUser );
1814         }
1815
1816         /**
1817          * action=protect handler
1818          */
1819         public function protect() {
1820                 $form = new ProtectionForm( $this );
1821                 $form->execute();
1822         }
1823
1824         /**
1825          * action=unprotect handler (alias)
1826          */
1827         public function unprotect() {
1828                 $this->protect();
1829         }
1830
1831         /**
1832          * Info about this page
1833          * Called for ?action=info when $wgAllowPageInfo is on.
1834          */
1835         public function info() {
1836                 Action::factory( 'info', $this )->show();
1837         }
1838
1839         /**
1840          * Insert a new empty page record for this article.
1841          * This *must* be followed up by creating a revision
1842          * and running $this->updateRevisionOn( ... );
1843          * or else the record will be left in a funky state.
1844          * Best if all done inside a transaction.
1845          *
1846          * @param $dbw DatabaseBase
1847          * @return int The newly created page_id key, or false if the title already existed
1848          * @private
1849          */
1850         public function insertOn( $dbw ) {
1851                 wfProfileIn( __METHOD__ );
1852
1853                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1854                 $dbw->insert( 'page', array(
1855                         'page_id'           => $page_id,
1856                         'page_namespace'    => $this->mTitle->getNamespace(),
1857                         'page_title'        => $this->mTitle->getDBkey(),
1858                         'page_counter'      => 0,
1859                         'page_restrictions' => '',
1860                         'page_is_redirect'  => 0, # Will set this shortly...
1861                         'page_is_new'       => 1,
1862                         'page_random'       => wfRandom(),
1863                         'page_touched'      => $dbw->timestamp(),
1864                         'page_latest'       => 0, # Fill this in shortly...
1865                         'page_len'          => 0, # Fill this in shortly...
1866                 ), __METHOD__, 'IGNORE' );
1867
1868                 $affected = $dbw->affectedRows();
1869
1870                 if ( $affected ) {
1871                         $newid = $dbw->insertId();
1872                         $this->mTitle->resetArticleID( $newid );
1873                 }
1874                 wfProfileOut( __METHOD__ );
1875
1876                 return $affected ? $newid : false;
1877         }
1878
1879         /**
1880          * Update the page record to point to a newly saved revision.
1881          *
1882          * @param $dbw DatabaseBase: object
1883          * @param $revision Revision: For ID number, and text used to set
1884                                                 length and redirect status fields
1885          * @param $lastRevision Integer: if given, will not overwrite the page field
1886          *                      when different from the currently set value.
1887          *                      Giving 0 indicates the new page flag should be set
1888          *                      on.
1889          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1890          *                           removing rows in redirect table.
1891          * @return bool true on success, false on failure
1892          * @private
1893          */
1894         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1895                 wfProfileIn( __METHOD__ );
1896
1897                 $text = $revision->getText();
1898                 $rt = Title::newFromRedirectRecurse( $text );
1899
1900                 $conditions = array( 'page_id' => $this->getId() );
1901
1902                 if ( !is_null( $lastRevision ) ) {
1903                         # An extra check against threads stepping on each other
1904                         $conditions['page_latest'] = $lastRevision;
1905                 }
1906
1907                 $dbw->update( 'page',
1908                         array( /* SET */
1909                                 'page_latest'      => $revision->getId(),
1910                                 'page_touched'     => $dbw->timestamp(),
1911                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1912                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1913                                 'page_len'         => strlen( $text ),
1914                         ),
1915                         $conditions,
1916                         __METHOD__ );
1917
1918                 $result = $dbw->affectedRows() != 0;
1919                 if ( $result ) {
1920                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1921                 }
1922
1923                 wfProfileOut( __METHOD__ );
1924                 return $result;
1925         }
1926
1927         /**
1928          * Add row to the redirect table if this is a redirect, remove otherwise.
1929          *
1930          * @param $dbw DatabaseBase
1931          * @param $redirectTitle Title object pointing to the redirect target,
1932          *                       or NULL if this is not a redirect
1933          * @param $lastRevIsRedirect If given, will optimize adding and
1934          *                           removing rows in redirect table.
1935          * @return bool true on success, false on failure
1936          * @private
1937          */
1938         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1939                 // Always update redirects (target link might have changed)
1940                 // Update/Insert if we don't know if the last revision was a redirect or not
1941                 // Delete if changing from redirect to non-redirect
1942                 $isRedirect = !is_null( $redirectTitle );
1943
1944                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1945                         return true;
1946                 }
1947
1948                 wfProfileIn( __METHOD__ );
1949                 if ( $isRedirect ) {
1950                         $this->insertRedirectEntry( $redirectTitle );
1951                 } else {
1952                         // This is not a redirect, remove row from redirect table
1953                         $where = array( 'rd_from' => $this->getId() );
1954                         $dbw->delete( 'redirect', $where, __METHOD__ );
1955                 }
1956
1957                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1958                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1959                 }
1960                 wfProfileOut( __METHOD__ );
1961
1962                 return ( $dbw->affectedRows() != 0 );
1963         }
1964
1965         /**
1966          * If the given revision is newer than the currently set page_latest,
1967          * update the page record. Otherwise, do nothing.
1968          *
1969          * @param $dbw Database object
1970          * @param $revision Revision object
1971          * @return mixed
1972          */
1973         public function updateIfNewerOn( &$dbw, $revision ) {
1974                 wfProfileIn( __METHOD__ );
1975
1976                 $row = $dbw->selectRow(
1977                         array( 'revision', 'page' ),
1978                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1979                         array(
1980                                 'page_id' => $this->getId(),
1981                                 'page_latest=rev_id' ),
1982                         __METHOD__ );
1983
1984                 if ( $row ) {
1985                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1986                                 wfProfileOut( __METHOD__ );
1987                                 return false;
1988                         }
1989                         $prev = $row->rev_id;
1990                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1991                 } else {
1992                         # No or missing previous revision; mark the page as new
1993                         $prev = 0;
1994                         $lastRevIsRedirect = null;
1995                 }
1996
1997                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1998
1999                 wfProfileOut( __METHOD__ );
2000                 return $ret;
2001         }
2002
2003         /**
2004          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
2005          * @param $text String: new text of the section
2006          * @param $summary String: new section's subject, only if $section is 'new'
2007          * @param $edittime String: revision timestamp or null to use the current revision
2008          * @return string Complete article text, or null if error
2009          */
2010         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
2011                 wfProfileIn( __METHOD__ );
2012
2013                 if ( strval( $section ) == '' ) {
2014                         // Whole-page edit; let the whole text through
2015                 } else {
2016                         if ( is_null( $edittime ) ) {
2017                                 $rev = Revision::newFromTitle( $this->mTitle );
2018                         } else {
2019                                 $dbw = wfGetDB( DB_MASTER );
2020                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
2021                         }
2022
2023                         if ( !$rev ) {
2024                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
2025                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
2026                                 wfProfileOut( __METHOD__ );
2027                                 return null;
2028                         }
2029
2030                         $oldtext = $rev->getText();
2031
2032                         if ( $section == 'new' ) {
2033                                 # Inserting a new section
2034                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
2035                                 $text = strlen( trim( $oldtext ) ) > 0
2036                                                 ? "{$oldtext}\n\n{$subject}{$text}"
2037                                                 : "{$subject}{$text}";
2038                         } else {
2039                                 # Replacing an existing section; roll out the big guns
2040                                 global $wgParser;
2041
2042                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
2043                         }
2044                 }
2045
2046                 wfProfileOut( __METHOD__ );
2047                 return $text;
2048         }
2049
2050         /**
2051          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
2052          * @param $flags Int
2053          * @return Int updated $flags
2054          */
2055         function checkFlags( $flags ) {
2056                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2057                         if ( $this->mTitle->getArticleID() ) {
2058                                 $flags |= EDIT_UPDATE;
2059                         } else {
2060                                 $flags |= EDIT_NEW;
2061                         }
2062                 }
2063
2064                 return $flags;
2065         }
2066
2067         /**
2068          * Article::doEdit()
2069          *
2070          * Change an existing article or create a new article. Updates RC and all necessary caches,
2071          * optionally via the deferred update array.
2072          *
2073          * $wgUser must be set before calling this function.
2074          *
2075          * @param $text String: new text
2076          * @param $summary String: edit summary
2077          * @param $flags Integer bitfield:
2078          *      EDIT_NEW
2079          *          Article is known or assumed to be non-existent, create a new one
2080          *      EDIT_UPDATE
2081          *          Article is known or assumed to be pre-existing, update it
2082          *      EDIT_MINOR
2083          *          Mark this edit minor, if the user is allowed to do so
2084          *      EDIT_SUPPRESS_RC
2085          *          Do not log the change in recentchanges
2086          *      EDIT_FORCE_BOT
2087          *          Mark the edit a "bot" edit regardless of user rights
2088          *      EDIT_DEFER_UPDATES
2089          *          Defer some of the updates until the end of index.php
2090          *      EDIT_AUTOSUMMARY
2091          *          Fill in blank summaries with generated text where possible
2092          *
2093          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2094          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2095          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2096          * edit-already-exists error will be returned. These two conditions are also possible with
2097          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2098          *
2099          * @param $baseRevId the revision ID this edit was based off, if any
2100          * @param $user User (optional), $wgUser will be used if not passed
2101          *
2102          * @return Status object. Possible errors:
2103          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2104          *     edit-gone-missing:       In update mode, but the article didn't exist
2105          *     edit-conflict:           In update mode, the article changed unexpectedly
2106          *     edit-no-change:          Warning that the text was the same as before
2107          *     edit-already-exists:     In creation mode, but the article already exists
2108          *
2109          *  Extensions may define additional errors.
2110          *
2111          *  $return->value will contain an associative array with members as follows:
2112          *     new:                     Boolean indicating if the function attempted to create a new article
2113          *     revision:                The revision object for the inserted revision, or null
2114          *
2115          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2116          */
2117         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2118                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2119
2120                 # Low-level sanity check
2121                 if ( $this->mTitle->getText() === '' ) {
2122                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2123                 }
2124
2125                 wfProfileIn( __METHOD__ );
2126
2127                 $user = is_null( $user ) ? $wgUser : $user;
2128                 $status = Status::newGood( array() );
2129
2130                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2131                 $this->loadPageData();
2132
2133                 $flags = $this->checkFlags( $flags );
2134
2135                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2136                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2137                 {
2138                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2139
2140                         if ( $status->isOK() ) {
2141                                 $status->fatal( 'edit-hook-aborted' );
2142                         }
2143
2144                         wfProfileOut( __METHOD__ );
2145                         return $status;
2146                 }
2147
2148                 # Silently ignore EDIT_MINOR if not allowed
2149                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2150                 $bot = $flags & EDIT_FORCE_BOT;
2151
2152                 $oldtext = $this->getRawText(); // current revision
2153                 $oldsize = strlen( $oldtext );
2154
2155                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2156                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2157                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2158                 }
2159
2160                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
2161                 $text = $editInfo->pst;
2162                 $newsize = strlen( $text );
2163
2164                 $dbw = wfGetDB( DB_MASTER );
2165                 $now = wfTimestampNow();
2166                 $this->mTimestamp = $now;
2167
2168                 if ( $flags & EDIT_UPDATE ) {
2169                         # Update article, but only if changed.
2170                         $status->value['new'] = false;
2171
2172                         # Make sure the revision is either completely inserted or not inserted at all
2173                         if ( !$wgDBtransactions ) {
2174                                 $userAbort = ignore_user_abort( true );
2175                         }
2176
2177                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2178
2179                         if ( $changed ) {
2180                                 if ( !$this->mLatest ) {
2181                                         # Article gone missing
2182                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2183                                         $status->fatal( 'edit-gone-missing' );
2184
2185                                         wfProfileOut( __METHOD__ );
2186                                         return $status;
2187                                 }
2188
2189                                 $revision = new Revision( array(
2190                                         'page'       => $this->getId(),
2191                                         'comment'    => $summary,
2192                                         'minor_edit' => $isminor,
2193                                         'text'       => $text,
2194                                         'parent_id'  => $this->mLatest,
2195                                         'user'       => $user->getId(),
2196                                         'user_text'  => $user->getName(),
2197                                         'timestamp'  => $now
2198                                 ) );
2199
2200                                 $dbw->begin();
2201                                 $revisionId = $revision->insertOn( $dbw );
2202
2203                                 # Update page
2204                                 #
2205                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2206                                 # during the course of this function. This makes sure that EditPage can detect
2207                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2208                                 # before this function is called. A previous function used a separate query, this
2209                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2210                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2211
2212                                 if ( !$ok ) {
2213                                         /* Belated edit conflict! Run away!! */
2214                                         $status->fatal( 'edit-conflict' );
2215
2216                                         # Delete the invalid revision if the DB is not transactional
2217                                         if ( !$wgDBtransactions ) {
2218                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2219                                         }
2220
2221                                         $revisionId = 0;
2222                                         $dbw->rollback();
2223                                 } else {
2224                                         global $wgUseRCPatrol;
2225                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2226                                         # Update recentchanges
2227                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2228                                                 # Mark as patrolled if the user can do so
2229                                                 $patrolled = $wgUseRCPatrol && !count(
2230                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2231                                                 # Add RC row to the DB
2232                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2233                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2234                                                         $revisionId, $patrolled
2235                                                 );
2236
2237                                                 # Log auto-patrolled edits
2238                                                 if ( $patrolled ) {
2239                                                         PatrolLog::record( $rc, true );
2240                                                 }
2241                                         }
2242                                         $user->incEditCount();
2243                                         $dbw->commit();
2244                                 }
2245                         } else {
2246                                 $status->warning( 'edit-no-change' );
2247                                 $revision = null;
2248                                 // Keep the same revision ID, but do some updates on it
2249                                 $revisionId = $this->getLatest();
2250                                 // Update page_touched, this is usually implicit in the page update
2251                                 // Other cache updates are done in onArticleEdit()
2252                                 $this->mTitle->invalidateCache();
2253                         }
2254
2255                         if ( !$wgDBtransactions ) {
2256                                 ignore_user_abort( $userAbort );
2257                         }
2258
2259                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2260                         if ( !$status->isOK() ) {
2261                                 wfProfileOut( __METHOD__ );
2262                                 return $status;
2263                         }
2264
2265                         # Invalidate cache of this article and all pages using this article
2266                         # as a template. Partly deferred.
2267                         Article::onArticleEdit( $this->mTitle );
2268                         # Update links tables, site stats, etc.
2269                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
2270                 } else {
2271                         # Create new article
2272                         $status->value['new'] = true;
2273
2274                         $dbw->begin();
2275
2276                         # Add the page record; stake our claim on this title!
2277                         # This will return false if the article already exists
2278                         $newid = $this->insertOn( $dbw );
2279
2280                         if ( $newid === false ) {
2281                                 $dbw->rollback();
2282                                 $status->fatal( 'edit-already-exists' );
2283
2284                                 wfProfileOut( __METHOD__ );
2285                                 return $status;
2286                         }
2287
2288                         # Save the revision text...
2289                         $revision = new Revision( array(
2290                                 'page'       => $newid,
2291                                 'comment'    => $summary,
2292                                 'minor_edit' => $isminor,
2293                                 'text'       => $text,
2294                                 'user'       => $user->getId(),
2295                                 'user_text'  => $user->getName(),
2296                                 'timestamp'  => $now
2297                         ) );
2298                         $revisionId = $revision->insertOn( $dbw );
2299
2300                         $this->mTitle->resetArticleID( $newid );
2301                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
2302                         # @todo FIXME?
2303                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
2304
2305                         # Update the page record with revision data
2306                         $this->updateRevisionOn( $dbw, $revision, 0 );
2307
2308                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2309
2310                         # Update recentchanges
2311                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2312                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2313
2314                                 # Mark as patrolled if the user can do so
2315                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2316                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2317                                 # Add RC row to the DB
2318                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2319                                         '', strlen( $text ), $revisionId, $patrolled );
2320
2321                                 # Log auto-patrolled edits
2322                                 if ( $patrolled ) {
2323                                         PatrolLog::record( $rc, true );
2324                                 }
2325                         }
2326                         $user->incEditCount();
2327                         $dbw->commit();
2328
2329                         # Update links, etc.
2330                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user, true );
2331
2332                         # Clear caches
2333                         Article::onArticleCreate( $this->mTitle );
2334
2335                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2336                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2337                 }
2338
2339                 # Do updates right now unless deferral was requested
2340                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2341                         wfDoUpdates();
2342                 }
2343
2344                 // Return the new revision (or null) to the caller
2345                 $status->value['revision'] = $revision;
2346
2347                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2348                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2349
2350                 # Promote user to any groups they meet the criteria for
2351                 $user->addAutopromoteOnceGroups( 'onEdit' );
2352
2353                 wfProfileOut( __METHOD__ );
2354                 return $status;
2355         }
2356
2357         /**
2358          * Output a redirect back to the article.
2359          * This is typically used after an edit.
2360          *
2361          * @deprecated in 1.19; call $wgOut->redirect() directly
2362          * @param $noRedir Boolean: add redirect=no
2363          * @param $sectionAnchor String: section to redirect to, including "#"
2364          * @param $extraQuery String: extra query params
2365          */
2366         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2367                 wfDeprecated( __METHOD__ );
2368                 global $wgOut;
2369
2370                 if ( $noRedir ) {
2371                         $query = 'redirect=no';
2372                         if ( $extraQuery )
2373                                 $query .= "&$extraQuery";
2374                 } else {
2375                         $query = $extraQuery;
2376                 }
2377
2378                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2379         }
2380
2381         /**
2382          * Update the article's restriction field, and leave a log entry.
2383          *
2384          * @param $limit Array: set of restriction keys
2385          * @param $reason String
2386          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2387          * @param $expiry Array: per restriction type expiration
2388          * @return bool true on success
2389          */
2390         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2391                 global $wgUser, $wgContLang;
2392
2393                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2394
2395                 $id = $this->mTitle->getArticleID();
2396
2397                 if ( $id <= 0 ) {
2398                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2399                         return false;
2400                 }
2401
2402                 if ( wfReadOnly() ) {
2403                         wfDebug( "updateRestrictions failed: read-only\n" );
2404                         return false;
2405                 }
2406
2407                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2408                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2409                         return false;
2410                 }
2411
2412                 if ( !$cascade ) {
2413                         $cascade = false;
2414                 }
2415
2416                 // Take this opportunity to purge out expired restrictions
2417                 Title::purgeExpiredRestrictions();
2418
2419                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2420                 # we expect a single selection, but the schema allows otherwise.
2421                 $current = array();
2422                 $updated = Article::flattenRestrictions( $limit );
2423                 $changed = false;
2424
2425                 foreach ( $restrictionTypes as $action ) {
2426                         if ( isset( $expiry[$action] ) ) {
2427                                 # Get current restrictions on $action
2428                                 $aLimits = $this->mTitle->getRestrictions( $action );
2429                                 $current[$action] = implode( '', $aLimits );
2430                                 # Are any actual restrictions being dealt with here?
2431                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2432
2433                                 # If something changed, we need to log it. Checking $aRChanged
2434                                 # assures that "unprotecting" a page that is not protected does
2435                                 # not log just because the expiry was "changed".
2436                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2437                                         $changed = true;
2438                                 }
2439                         }
2440                 }
2441
2442                 $current = Article::flattenRestrictions( $current );
2443
2444                 $changed = ( $changed || $current != $updated );
2445                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2446                 $protect = ( $updated != '' );
2447
2448                 # If nothing's changed, do nothing
2449                 if ( $changed ) {
2450                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2451                                 $dbw = wfGetDB( DB_MASTER );
2452
2453                                 # Prepare a null revision to be added to the history
2454                                 $modified = $current != '' && $protect;
2455
2456                                 if ( $protect ) {
2457                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2458                                 } else {
2459                                         $comment_type = 'unprotectedarticle';
2460                                 }
2461
2462                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2463
2464                                 # Only restrictions with the 'protect' right can cascade...
2465                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2466                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2467
2468                                 # The schema allows multiple restrictions
2469                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2470                                         $cascade = false;
2471                                 }
2472
2473                                 $cascade_description = '';
2474
2475                                 if ( $cascade ) {
2476                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2477                                 }
2478
2479                                 if ( $reason ) {
2480                                         $comment .= ": $reason";
2481                                 }
2482
2483                                 $editComment = $comment;
2484                                 $encodedExpiry = array();
2485                                 $protect_description = '';
2486                                 foreach ( $limit as $action => $restrictions ) {
2487                                         if ( !isset( $expiry[$action] ) )
2488                                                 $expiry[$action] = $dbw->getInfinity();
2489
2490                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2491                                         if ( $restrictions != '' ) {
2492                                                 $protect_description .= "[$action=$restrictions] (";
2493                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2494                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2495                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2496                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2497                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2498                                                 } else {
2499                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2500                                                 }
2501
2502                                                 $protect_description .= ') ';
2503                                         }
2504                                 }
2505                                 $protect_description = trim( $protect_description );
2506
2507                                 if ( $protect_description && $protect ) {
2508                                         $editComment .= " ($protect_description)";
2509                                 }
2510
2511                                 if ( $cascade ) {
2512                                         $editComment .= "$cascade_description";
2513                                 }
2514
2515                                 # Update restrictions table
2516                                 foreach ( $limit as $action => $restrictions ) {
2517                                         if ( $restrictions != '' ) {
2518                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2519                                                         array( 'pr_page' => $id,
2520                                                                 'pr_type' => $action,
2521                                                                 'pr_level' => $restrictions,
2522                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2523                                                                 'pr_expiry' => $encodedExpiry[$action]
2524                                                         ),
2525                                                         __METHOD__
2526                                                 );
2527                                         } else {
2528                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2529                                                         'pr_type' => $action ), __METHOD__ );
2530                                         }
2531                                 }
2532
2533                                 # Insert a null revision
2534                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2535                                 $nullRevId = $nullRevision->insertOn( $dbw );
2536
2537                                 $latest = $this->getLatest();
2538                                 # Update page record
2539                                 $dbw->update( 'page',
2540                                         array( /* SET */
2541                                                 'page_touched' => $dbw->timestamp(),
2542                                                 'page_restrictions' => '',
2543                                                 'page_latest' => $nullRevId
2544                                         ), array( /* WHERE */
2545                                                 'page_id' => $id
2546                                         ), 'Article::protect'
2547                                 );
2548
2549                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2550                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2551
2552                                 # Update the protection log
2553                                 $log = new LogPage( 'protect' );
2554                                 if ( $protect ) {
2555                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2556                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2557                                 } else {
2558                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2559                                 }
2560                         } # End hook
2561                 } # End "changed" check
2562
2563                 return true;
2564         }
2565
2566         /**
2567          * Take an array of page restrictions and flatten it to a string
2568          * suitable for insertion into the page_restrictions field.
2569          * @param $limit Array
2570          * @return String
2571          */
2572         protected static function flattenRestrictions( $limit ) {
2573                 if ( !is_array( $limit ) ) {
2574                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2575                 }
2576
2577                 $bits = array();
2578                 ksort( $limit );
2579
2580                 foreach ( $limit as $action => $restrictions ) {
2581                         if ( $restrictions != '' ) {
2582                                 $bits[] = "$action=$restrictions";
2583                         }
2584                 }
2585
2586                 return implode( ':', $bits );
2587         }
2588
2589         /**
2590          * Auto-generates a deletion reason
2591          *
2592          * @param &$hasHistory Boolean: whether the page has a history
2593          * @return mixed String containing deletion reason or empty string, or boolean false
2594          *    if no revision occurred
2595          */
2596         public function generateReason( &$hasHistory ) {
2597                 global $wgContLang;
2598
2599                 $dbw = wfGetDB( DB_MASTER );
2600                 // Get the last revision
2601                 $rev = Revision::newFromTitle( $this->mTitle );
2602
2603                 if ( is_null( $rev ) ) {
2604                         return false;
2605                 }
2606
2607                 // Get the article's contents
2608                 $contents = $rev->getText();
2609                 $blank = false;
2610
2611                 // If the page is blank, use the text from the previous revision,
2612                 // which can only be blank if there's a move/import/protect dummy revision involved
2613                 if ( $contents == '' ) {
2614                         $prev = $rev->getPrevious();
2615
2616                         if ( $prev )    {
2617                                 $contents = $prev->getText();
2618                                 $blank = true;
2619                         }
2620                 }
2621
2622                 // Find out if there was only one contributor
2623                 // Only scan the last 20 revisions
2624                 $res = $dbw->select( 'revision', 'rev_user_text',
2625                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2626                         __METHOD__,
2627                         array( 'LIMIT' => 20 )
2628                 );
2629
2630                 if ( $res === false ) {
2631                         // This page has no revisions, which is very weird
2632                         return false;
2633                 }
2634
2635                 $hasHistory = ( $res->numRows() > 1 );
2636                 $row = $dbw->fetchObject( $res );
2637
2638                 if ( $row ) { // $row is false if the only contributor is hidden
2639                         $onlyAuthor = $row->rev_user_text;
2640                         // Try to find a second contributor
2641                         foreach ( $res as $row ) {
2642                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2643                                         $onlyAuthor = false;
2644                                         break;
2645                                 }
2646                         }
2647                 } else {
2648                         $onlyAuthor = false;
2649                 }
2650
2651                 // Generate the summary with a '$1' placeholder
2652                 if ( $blank ) {
2653                         // The current revision is blank and the one before is also
2654                         // blank. It's just not our lucky day
2655                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2656                 } else {
2657                         if ( $onlyAuthor ) {
2658                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2659                         } else {
2660                                 $reason = wfMsgForContent( 'excontent', '$1' );
2661                         }
2662                 }
2663
2664                 if ( $reason == '-' ) {
2665                         // Allow these UI messages to be blanked out cleanly
2666                         return '';
2667                 }
2668
2669                 // Replace newlines with spaces to prevent uglyness
2670                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2671                 // Calculate the maximum amount of chars to get
2672                 // Max content length = max comment length - length of the comment (excl. $1)
2673                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2674                 $contents = $wgContLang->truncate( $contents, $maxLength );
2675                 // Remove possible unfinished links
2676                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2677                 // Now replace the '$1' placeholder
2678                 $reason = str_replace( '$1', $contents, $reason );
2679
2680                 return $reason;
2681         }
2682
2683
2684         /**
2685          * UI entry point for page deletion
2686          */
2687         public function delete() {
2688                 global $wgOut, $wgRequest;
2689
2690                 $confirm = $wgRequest->wasPosted() &&
2691                                 $wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2692
2693                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2694                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2695
2696                 $reason = $this->DeleteReasonList;
2697
2698                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2699                         // Entry from drop down menu + additional comment
2700                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2701                 } elseif ( $reason == 'other' ) {
2702                         $reason = $this->DeleteReason;
2703                 }
2704
2705                 # Flag to hide all contents of the archived revisions
2706                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgOut->getUser()->isAllowed( 'suppressrevision' );
2707
2708                 # This code desperately needs to be totally rewritten
2709
2710                 # Read-only check...
2711                 if ( wfReadOnly() ) {
2712                         $wgOut->readOnlyPage();
2713
2714                         return;
2715                 }
2716
2717                 # Check permissions
2718                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
2719
2720                 if ( count( $permission_errors ) > 0 ) {
2721                         $wgOut->showPermissionsErrorPage( $permission_errors );
2722
2723                         return;
2724                 }
2725
2726                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2727
2728                 # Better double-check that it hasn't been deleted yet!
2729                 $dbw = wfGetDB( DB_MASTER );
2730                 $conds = $this->mTitle->pageCond();
2731                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2732                 if ( $latest === false ) {
2733                         $wgOut->showFatalError(
2734                                 Html::rawElement(
2735                                         'div',
2736                                         array( 'class' => 'error mw-error-cannotdelete' ),
2737                                         wfMsgExt( 'cannotdelete', array( 'parse' ),
2738                                                 wfEscapeWikiText( $this->mTitle->getPrefixedText() ) )
2739                                 )
2740                         );
2741                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2742                         LogEventsList::showLogExtract(
2743                                 $wgOut,
2744                                 'delete',
2745                                 $this->mTitle->getPrefixedText()
2746                         );
2747
2748                         return;
2749                 }
2750
2751                 # Hack for big sites
2752                 $bigHistory = $this->isBigDeletion();
2753                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2754                         global $wgLang, $wgDeleteRevisionsLimit;
2755
2756                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2757                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2758
2759                         return;
2760                 }
2761
2762                 if ( $confirm ) {
2763                         $this->doDelete( $reason, $suppress );
2764
2765                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgOut->getUser()->isLoggedIn() ) {
2766                                 $this->doWatch();
2767                         } elseif ( $this->mTitle->userIsWatching() ) {
2768                                 $this->doUnwatch();
2769                         }
2770
2771                         return;
2772                 }
2773
2774                 // Generate deletion reason
2775                 $hasHistory = false;
2776                 if ( !$reason ) {
2777                         $reason = $this->generateReason( $hasHistory );
2778                 }
2779
2780                 // If the page has a history, insert a warning
2781                 if ( $hasHistory && !$confirm ) {
2782                         global $wgLang;
2783
2784                         $revisions = $this->estimateRevisionCount();
2785                         // @todo FIXME: i18n issue/patchwork message
2786                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2787                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2788                                 wfMsgHtml( 'word-separator' ) . Linker::link( $this->mTitle,
2789                                         wfMsgHtml( 'history' ),
2790                                         array( 'rel' => 'archives' ),
2791                                         array( 'action' => 'history' ) ) .
2792                                 '</strong>'
2793                         );
2794
2795                         if ( $bigHistory ) {
2796                                 global $wgDeleteRevisionsLimit;
2797                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2798                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2799                         }
2800                 }
2801
2802                 return $this->confirmDelete( $reason );
2803         }
2804
2805         /**
2806          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2807          */
2808         public function isBigDeletion() {
2809                 global $wgDeleteRevisionsLimit;
2810
2811                 if ( $wgDeleteRevisionsLimit ) {
2812                         $revCount = $this->estimateRevisionCount();
2813
2814                         return $revCount > $wgDeleteRevisionsLimit;
2815                 }
2816
2817                 return false;
2818         }
2819
2820         /**
2821          * @return int approximate revision count
2822          */
2823         public function estimateRevisionCount() {
2824                 $dbr = wfGetDB( DB_SLAVE );
2825
2826                 // For an exact count...
2827                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2828                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2829                 return $dbr->estimateRowCount( 'revision', '*',
2830                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2831         }
2832
2833         /**
2834          * Get the last N authors
2835          * @param $num Integer: number of revisions to get
2836          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2837          * @return array Array of authors, duplicates not removed
2838          */
2839         public function getLastNAuthors( $num, $revLatest = 0 ) {
2840                 wfProfileIn( __METHOD__ );
2841                 // First try the slave
2842                 // If that doesn't have the latest revision, try the master
2843                 $continue = 2;
2844                 $db = wfGetDB( DB_SLAVE );
2845
2846                 do {
2847                         $res = $db->select( array( 'page', 'revision' ),
2848                                 array( 'rev_id', 'rev_user_text' ),
2849                                 array(
2850                                         'page_namespace' => $this->mTitle->getNamespace(),
2851                                         'page_title' => $this->mTitle->getDBkey(),
2852                                         'rev_page = page_id'
2853                                 ), __METHOD__,
2854                                 array(
2855                                         'ORDER BY' => 'rev_timestamp DESC',
2856                                         'LIMIT' => $num
2857                                 )
2858                         );
2859
2860                         if ( !$res ) {
2861                                 wfProfileOut( __METHOD__ );
2862                                 return array();
2863                         }
2864
2865                         $row = $db->fetchObject( $res );
2866
2867                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2868                                 $db = wfGetDB( DB_MASTER );
2869                                 $continue--;
2870                         } else {
2871                                 $continue = 0;
2872                         }
2873                 } while ( $continue );
2874
2875                 $authors = array( $row->rev_user_text );
2876
2877                 foreach ( $res as $row ) {
2878                         $authors[] = $row->rev_user_text;
2879                 }
2880
2881                 wfProfileOut( __METHOD__ );
2882                 return $authors;
2883         }
2884
2885         /**
2886          * Output deletion confirmation dialog
2887          * @todo FIXME: Move to another file?
2888          * @param $reason String: prefilled reason
2889          */
2890         public function confirmDelete( $reason ) {
2891                 global $wgOut;
2892
2893                 wfDebug( "Article::confirmDelete\n" );
2894
2895                 $deleteBackLink = Linker::linkKnown( $this->mTitle );
2896                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2897                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2898                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2899
2900                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2901
2902                 if ( $wgOut->getUser()->isAllowed( 'suppressrevision' ) ) {
2903                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
2904                                         <td></td>
2905                                         <td class='mw-input'><strong>" .
2906                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2907                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2908                                         "</strong></td>
2909                                 </tr>";
2910                 } else {
2911                         $suppress = '';
2912                 }
2913                 $checkWatch = $wgOut->getUser()->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2914
2915                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2916                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2917                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2918                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2919                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2920                         "<tr id=\"wpDeleteReasonListRow\">
2921                                 <td class='mw-label'>" .
2922                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2923                                 "</td>
2924                                 <td class='mw-input'>" .
2925                                         Xml::listDropDown( 'wpDeleteReasonList',
2926                                                 wfMsgForContent( 'deletereason-dropdown' ),
2927                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2928                                 "</td>
2929                         </tr>
2930                         <tr id=\"wpDeleteReasonRow\">
2931                                 <td class='mw-label'>" .
2932                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2933                                 "</td>
2934                                 <td class='mw-input'>" .
2935                                 Html::input( 'wpReason', $reason, 'text', array(
2936                                         'size' => '60',
2937                                         'maxlength' => '255',
2938                                         'tabindex' => '2',
2939                                         'id' => 'wpReason',
2940                                         'autofocus'
2941                                 ) ) .
2942                                 "</td>
2943                         </tr>";
2944
2945                 # Disallow watching if user is not logged in
2946                 if ( $wgOut->getUser()->isLoggedIn() ) {
2947                         $form .= "
2948                         <tr>
2949                                 <td></td>
2950                                 <td class='mw-input'>" .
2951                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2952                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2953                                 "</td>
2954                         </tr>";
2955                 }
2956
2957                 $form .= "
2958                         $suppress
2959                         <tr>
2960                                 <td></td>
2961                                 <td class='mw-submit'>" .
2962                                         Xml::submitButton( wfMsg( 'deletepage' ),
2963                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2964                                 "</td>
2965                         </tr>" .
2966                         Xml::closeElement( 'table' ) .
2967                         Xml::closeElement( 'fieldset' ) .
2968                         Html::hidden( 'wpEditToken', $wgOut->getUser()->editToken() ) .
2969                         Xml::closeElement( 'form' );
2970
2971                         if ( $wgOut->getUser()->isAllowed( 'editinterface' ) ) {
2972                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2973                                 $link = Linker::link(
2974                                         $title,
2975                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2976                                         array(),
2977                                         array( 'action' => 'edit' )
2978                                 );
2979                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2980                         }
2981
2982                 $wgOut->addHTML( $form );
2983                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2984                 LogEventsList::showLogExtract( $wgOut, 'delete',
2985                         $this->mTitle->getPrefixedText()
2986                 );
2987         }
2988
2989         /**
2990          * Perform a deletion and output success or failure messages
2991          */
2992         public function doDelete( $reason, $suppress = false ) {
2993                 global $wgOut;
2994
2995                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
2996
2997                 $error = '';
2998                 if ( $this->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
2999                         $deleted = $this->mTitle->getPrefixedText();
3000
3001                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3002                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
3003
3004                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3005
3006                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
3007                         $wgOut->returnToMain( false );
3008                 } else {
3009                         if ( $error == '' ) {
3010                                 $wgOut->showFatalError(
3011                                         Html::rawElement(
3012                                                 'div',
3013                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3014                                                 wfMsgExt( 'cannotdelete', array( 'parse' ),
3015                                                         wfEscapeWikiText( $this->mTitle->getPrefixedText() ) )
3016                                         )
3017                                 );
3018
3019                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3020
3021                                 LogEventsList::showLogExtract(
3022                                         $wgOut,
3023                                         'delete',
3024                                         $this->mTitle->getPrefixedText()
3025                                 );
3026                         } else {
3027                                 $wgOut->showFatalError( $error );
3028                         }
3029                 }
3030         }
3031
3032         /**
3033          * Back-end article deletion
3034          * Deletes the article with database consistency, writes logs, purges caches
3035          *
3036          * @param $reason string delete reason for deletion log
3037          * @param suppress bitfield
3038          *      Revision::DELETED_TEXT
3039          *      Revision::DELETED_COMMENT
3040          *      Revision::DELETED_USER
3041          *      Revision::DELETED_RESTRICTED
3042          * @param $id int article ID
3043          * @param $commit boolean defaults to true, triggers transaction end
3044          * @return boolean true if successful
3045          */
3046         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
3047                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3048                 global $wgUser;
3049
3050                 wfDebug( __METHOD__ . "\n" );
3051
3052                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3053                         return false;
3054                 }
3055                 $dbw = wfGetDB( DB_MASTER );
3056                 $t = $this->mTitle->getDBkey();
3057                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3058
3059                 if ( $t === '' || $id == 0 ) {
3060                         return false;
3061                 }
3062
3063                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
3064                 array_push( $wgDeferredUpdateList, $u );
3065
3066                 // Bitfields to further suppress the content
3067                 if ( $suppress ) {
3068                         $bitfield = 0;
3069                         // This should be 15...
3070                         $bitfield |= Revision::DELETED_TEXT;
3071                         $bitfield |= Revision::DELETED_COMMENT;
3072                         $bitfield |= Revision::DELETED_USER;
3073                         $bitfield |= Revision::DELETED_RESTRICTED;
3074                 } else {
3075                         $bitfield = 'rev_deleted';
3076                 }
3077
3078                 $dbw->begin();
3079                 // For now, shunt the revision data into the archive table.
3080                 // Text is *not* removed from the text table; bulk storage
3081                 // is left intact to avoid breaking block-compression or
3082                 // immutable storage schemes.
3083                 //
3084                 // For backwards compatibility, note that some older archive
3085                 // table entries will have ar_text and ar_flags fields still.
3086                 //
3087                 // In the future, we may keep revisions and mark them with
3088                 // the rev_deleted field, which is reserved for this purpose.
3089                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3090                         array(
3091                                 'ar_namespace'  => 'page_namespace',
3092                                 'ar_title'      => 'page_title',
3093                                 'ar_comment'    => 'rev_comment',
3094                                 'ar_user'       => 'rev_user',
3095                                 'ar_user_text'  => 'rev_user_text',
3096                                 'ar_timestamp'  => 'rev_timestamp',
3097                                 'ar_minor_edit' => 'rev_minor_edit',
3098                                 'ar_rev_id'     => 'rev_id',
3099                                 'ar_text_id'    => 'rev_text_id',
3100                                 'ar_text'       => '\'\'', // Be explicit to appease
3101                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3102                                 'ar_len'        => 'rev_len',
3103                                 'ar_page_id'    => 'page_id',
3104                                 'ar_deleted'    => $bitfield
3105                         ), array(
3106                                 'page_id' => $id,
3107                                 'page_id = rev_page'
3108                         ), __METHOD__
3109                 );
3110
3111                 # Delete restrictions for it
3112                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3113
3114                 # Now that it's safely backed up, delete it
3115                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3116                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3117
3118                 if ( !$ok ) {
3119                         $dbw->rollback();
3120                         return false;
3121                 }
3122
3123                 # Fix category table counts
3124                 $cats = array();
3125                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3126
3127                 foreach ( $res as $row ) {
3128                         $cats [] = $row->cl_to;
3129                 }
3130
3131                 $this->updateCategoryCounts( array(), $cats );
3132
3133                 # If using cascading deletes, we can skip some explicit deletes
3134                 if ( !$dbw->cascadingDeletes() ) {
3135                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3136
3137                         if ( $wgUseTrackbacks )
3138                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3139
3140                         # Delete outgoing links
3141                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3142                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3143                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3144                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3145                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3146                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3147                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
3148                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3149                 }
3150
3151                 # If using cleanup triggers, we can skip some manual deletes
3152                 if ( !$dbw->cleanupTriggers() ) {
3153                         # Clean up recentchanges entries...
3154                         $dbw->delete( 'recentchanges',
3155                                 array( 'rc_type != ' . RC_LOG,
3156                                         'rc_namespace' => $this->mTitle->getNamespace(),
3157                                         'rc_title' => $this->mTitle->getDBkey() ),
3158                                 __METHOD__ );
3159                         $dbw->delete( 'recentchanges',
3160                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3161                                 __METHOD__ );
3162                 }
3163
3164                 # Clear caches
3165                 Article::onArticleDelete( $this->mTitle );
3166
3167                 # Clear the cached article id so the interface doesn't act like we exist
3168                 $this->mTitle->resetArticleID( 0 );
3169
3170                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3171                 $logtype = $suppress ? 'suppress' : 'delete';
3172                 $log = new LogPage( $logtype );
3173
3174                 # Make sure logging got through
3175                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3176
3177                 if ( $commit ) {
3178                         $dbw->commit();
3179                 }
3180
3181                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3182                 return true;
3183         }
3184
3185         /**
3186          * Roll back the most recent consecutive set of edits to a page
3187          * from the same user; fails if there are no eligible edits to
3188          * roll back to, e.g. user is the sole contributor. This function
3189          * performs permissions checks on $wgUser, then calls commitRollback()
3190          * to do the dirty work
3191          *
3192          * @param $fromP String: Name of the user whose edits to rollback.
3193          * @param $summary String: Custom summary. Set to default summary if empty.
3194          * @param $token String: Rollback token.
3195          * @param $bot Boolean: If true, mark all reverted edits as bot.
3196          *
3197          * @param $resultDetails Array: contains result-specific array of additional values
3198          *    'alreadyrolled' : 'current' (rev)
3199          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3200          *
3201          * @return array of errors, each error formatted as
3202          *   array(messagekey, param1, param2, ...).
3203          * On success, the array is empty.  This array can also be passed to
3204          * OutputPage::showPermissionsErrorPage().
3205          */
3206         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3207                 global $wgUser;
3208
3209                 $resultDetails = null;
3210
3211                 # Check permissions
3212                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3213                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3214                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3215
3216                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3217                         $errors[] = array( 'sessionfailure' );
3218                 }
3219
3220                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3221                         $errors[] = array( 'actionthrottledtext' );
3222                 }
3223
3224                 # If there were errors, bail out now
3225                 if ( !empty( $errors ) ) {
3226                         return $errors;
3227                 }
3228
3229                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3230         }
3231
3232         /**
3233          * Backend implementation of doRollback(), please refer there for parameter
3234          * and return value documentation
3235          *
3236          * NOTE: This function does NOT check ANY permissions, it just commits the
3237          * rollback to the DB Therefore, you should only call this function direct-
3238          * ly if you want to use custom permissions checks. If you don't, use
3239          * doRollback() instead.
3240          */
3241         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3242                 global $wgUseRCPatrol, $wgUser, $wgLang;
3243
3244                 $dbw = wfGetDB( DB_MASTER );
3245
3246                 if ( wfReadOnly() ) {
3247                         return array( array( 'readonlytext' ) );
3248                 }
3249
3250                 # Get the last editor
3251                 $current = Revision::newFromTitle( $this->mTitle );
3252                 if ( is_null( $current ) ) {
3253                         # Something wrong... no page?
3254                         return array( array( 'notanarticle' ) );
3255                 }
3256
3257                 $from = str_replace( '_', ' ', $fromP );
3258                 # User name given should match up with the top revision.
3259                 # If the user was deleted then $from should be empty.
3260                 if ( $from != $current->getUserText() ) {
3261                         $resultDetails = array( 'current' => $current );
3262                         return array( array( 'alreadyrolled',
3263                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3264                                 htmlspecialchars( $fromP ),
3265                                 htmlspecialchars( $current->getUserText() )
3266                         ) );
3267                 }
3268
3269                 # Get the last edit not by this guy...
3270                 # Note: these may not be public values
3271                 $user = intval( $current->getRawUser() );
3272                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3273                 $s = $dbw->selectRow( 'revision',
3274                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3275                         array( 'rev_page' => $current->getPage(),
3276                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3277                         ), __METHOD__,
3278                         array( 'USE INDEX' => 'page_timestamp',
3279                                 'ORDER BY' => 'rev_timestamp DESC' )
3280                         );
3281                 if ( $s === false ) {
3282                         # No one else ever edited this page
3283                         return array( array( 'cantrollback' ) );
3284                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3285                         # Only admins can see this text
3286                         return array( array( 'notvisiblerev' ) );
3287                 }
3288
3289                 $set = array();
3290                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3291                         # Mark all reverted edits as bot
3292                         $set['rc_bot'] = 1;
3293                 }
3294
3295                 if ( $wgUseRCPatrol ) {
3296                         # Mark all reverted edits as patrolled
3297                         $set['rc_patrolled'] = 1;
3298                 }
3299
3300                 if ( count( $set ) ) {
3301                         $dbw->update( 'recentchanges', $set,
3302                                 array( /* WHERE */
3303                                         'rc_cur_id' => $current->getPage(),
3304                                         'rc_user_text' => $current->getUserText(),
3305                                         "rc_timestamp > '{$s->rev_timestamp}'",
3306                                 ), __METHOD__
3307                         );
3308                 }
3309
3310                 # Generate the edit summary if necessary
3311                 $target = Revision::newFromId( $s->rev_id );
3312                 if ( empty( $summary ) ) {
3313                         if ( $from == '' ) { // no public user name
3314                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3315                         } else {
3316                                 $summary = wfMsgForContent( 'revertpage' );
3317                         }
3318                 }
3319
3320                 # Allow the custom summary to use the same args as the default message
3321                 $args = array(
3322                         $target->getUserText(), $from, $s->rev_id,
3323                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3324                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3325                 );
3326                 $summary = wfMsgReplaceArgs( $summary, $args );
3327
3328                 # Save
3329                 $flags = EDIT_UPDATE;
3330
3331                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3332                         $flags |= EDIT_MINOR;
3333                 }
3334
3335                 if ( $bot && ( $wgUser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3336                         $flags |= EDIT_FORCE_BOT;
3337                 }
3338
3339                 # Actually store the edit
3340                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3341                 if ( !empty( $status->value['revision'] ) ) {
3342                         $revId = $status->value['revision']->getId();
3343                 } else {
3344                         $revId = false;
3345                 }
3346
3347                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3348
3349                 $resultDetails = array(
3350                         'summary' => $summary,
3351                         'current' => $current,
3352                         'target'  => $target,
3353                         'newid'   => $revId
3354                 );
3355
3356                 return array();
3357         }
3358
3359         /**
3360          * User interface for rollback operations
3361          */
3362         public function rollback() {
3363                 global $wgUser, $wgOut, $wgRequest;
3364
3365                 $details = null;
3366
3367                 $result = $this->doRollback(
3368                         $wgRequest->getVal( 'from' ),
3369                         $wgRequest->getText( 'summary' ),
3370                         $wgRequest->getVal( 'token' ),
3371                         $wgRequest->getBool( 'bot' ),
3372                         $details
3373                 );
3374
3375                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3376                         $wgOut->rateLimited();
3377                         return;
3378                 }
3379
3380                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3381                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3382                         $errArray = $result[0];
3383                         $errMsg = array_shift( $errArray );
3384                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3385
3386                         if ( isset( $details['current'] ) ) {
3387                                 $current = $details['current'];
3388
3389                                 if ( $current->getComment() != '' ) {
3390                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3391                                                 Linker::formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3392                                 }
3393                         }
3394
3395                         return;
3396                 }
3397
3398                 # Display permissions errors before read-only message -- there's no
3399                 # point in misleading the user into thinking the inability to rollback
3400                 # is only temporary.
3401                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3402                         # array_diff is completely broken for arrays of arrays, sigh.
3403                         # Remove any 'readonlytext' error manually.
3404                         $out = array();
3405                         foreach ( $result as $error ) {
3406                                 if ( $error != array( 'readonlytext' ) ) {
3407                                         $out [] = $error;
3408                                 }
3409                         }
3410                         $wgOut->showPermissionsErrorPage( $out );
3411
3412                         return;
3413                 }
3414
3415                 if ( $result == array( array( 'readonlytext' ) ) ) {
3416                         $wgOut->readOnlyPage();
3417
3418                         return;
3419                 }
3420
3421                 $current = $details['current'];
3422                 $target = $details['target'];
3423                 $newId = $details['newid'];
3424                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3425                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3426
3427                 if ( $current->getUserText() === '' ) {
3428                         $old = wfMsg( 'rev-deleted-user' );
3429                 } else {
3430                         $old = Linker::userLink( $current->getUser(), $current->getUserText() )
3431                                 . Linker::userToolLinks( $current->getUser(), $current->getUserText() );
3432                 }
3433
3434                 $new = Linker::userLink( $target->getUser(), $target->getUserText() )
3435                         . Linker::userToolLinks( $target->getUser(), $target->getUserText() );
3436                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3437                 $wgOut->returnToMain( false, $this->mTitle );
3438
3439                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3440                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3441                         $de->showDiff( '', '' );
3442                 }
3443         }
3444
3445         /**
3446          * Do standard deferred updates after page view
3447          */
3448         public function viewUpdates() {
3449                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3450                 if ( wfReadOnly() ) {
3451                         return;
3452                 }
3453
3454                 # Don't update page view counters on views from bot users (bug 14044)
3455                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3456                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3457                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3458                 }
3459
3460                 # Update newtalk / watchlist notification status
3461                 $wgUser->clearNotification( $this->mTitle );
3462         }
3463
3464         /**
3465          * Prepare text which is about to be saved.
3466          * Returns a stdclass with source, pst and output members
3467          */
3468         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
3469                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3470                         // Already prepared
3471                         return $this->mPreparedEdit;
3472                 }
3473
3474                 global $wgParser;
3475
3476                 if( $user === null ) {
3477                         global $wgUser;
3478                         $user = $wgUser;
3479                 }
3480                 $popts = ParserOptions::newFromUser( $user );
3481                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
3482
3483                 $edit = (object)array();
3484                 $edit->revid = $revid;
3485                 $edit->newText = $text;
3486                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
3487                 $edit->popts = $this->getParserOptions( true );
3488                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3489                 $edit->oldText = $this->getRawText();
3490
3491                 $this->mPreparedEdit = $edit;
3492
3493                 return $edit;
3494         }
3495
3496         /**
3497          * Do standard deferred updates after page edit.
3498          * Update links tables, site stats, search index and message cache.
3499          * Purges pages that include this page if the text was changed here.
3500          * Every 100th edit, prune the recent changes table.
3501          *
3502          * @private
3503          * @param $text String: New text of the article
3504          * @param $summary String: Edit summary
3505          * @param $minoredit Boolean: Minor edit
3506          * @param $timestamp_of_pagechange String timestamp associated with the page change
3507          * @param $newid Integer: rev_id value of the new revision
3508          * @param $changed Boolean: Whether or not the content actually changed
3509          * @param $user User object: User doing the edit
3510          * @param $created Boolean: Whether the edit created the page
3511          */
3512         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid,
3513                 $changed = true, User $user = null, $created = false )
3514         {
3515                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
3516
3517                 wfProfileIn( __METHOD__ );
3518
3519                 # Parse the text
3520                 # Be careful not to double-PST: $text is usually already PST-ed once
3521                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3522                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3523                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
3524                 } else {
3525                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3526                         $editInfo = $this->mPreparedEdit;
3527                 }
3528
3529                 # Save it to the parser cache
3530                 if ( $wgEnableParserCache ) {
3531                         $parserCache = ParserCache::singleton();
3532                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3533                 }
3534
3535                 # Update the links tables
3536                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3537                 $u->doUpdate();
3538
3539                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3540
3541                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3542                         if ( 0 == mt_rand( 0, 99 ) ) {
3543                                 // Flush old entries from the `recentchanges` table; we do this on
3544                                 // random requests so as to avoid an increase in writes for no good reason
3545                                 global $wgRCMaxAge;
3546
3547                                 $dbw = wfGetDB( DB_MASTER );
3548                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3549                                 $dbw->delete(
3550                                         'recentchanges',
3551                                         array( "rc_timestamp < '$cutoff'" ),
3552                                         __METHOD__
3553                                 );
3554                         }
3555                 }
3556
3557                 $id = $this->getID();
3558                 $title = $this->mTitle->getPrefixedDBkey();
3559                 $shortTitle = $this->mTitle->getDBkey();
3560
3561                 if ( 0 == $id ) {
3562                         wfProfileOut( __METHOD__ );
3563                         return;
3564                 }
3565
3566                 if ( !$changed ) {
3567                         $good = 0;
3568                         $total = 0;
3569                 } elseif ( $created ) {
3570                         $good = (int)$this->isCountable( $editInfo );
3571                         $total = 1;
3572                 } else {
3573                         $good = (int)$this->isCountable( $editInfo ) - (int)$this->isCountable();
3574                         $total = 0;
3575                 }
3576
3577                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
3578                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
3579
3580                 # If this is another user's talk page, update newtalk
3581                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3582                 # load of user talk pages and piss people off, nor if it's a minor edit
3583                 # by a properly-flagged bot.
3584                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3585                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3586                 ) {
3587                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3588                                 $other = User::newFromName( $shortTitle, false );
3589                                 if ( !$other ) {
3590                                         wfDebug( __METHOD__ . ": invalid username\n" );
3591                                 } elseif ( User::isIP( $shortTitle ) ) {
3592                                         // An anonymous user
3593                                         $other->setNewtalk( true );
3594                                 } elseif ( $other->isLoggedIn() ) {
3595                                         $other->setNewtalk( true );
3596                                 } else {
3597                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3598                                 }
3599                         }
3600                 }
3601
3602                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3603                         MessageCache::singleton()->replace( $shortTitle, $text );
3604                 }
3605
3606                 wfProfileOut( __METHOD__ );
3607         }
3608
3609         /**
3610          * Perform article updates on a special page creation.
3611          *
3612          * @param $rev Revision object
3613          *
3614          * @todo This is a shitty interface function. Kill it and replace the
3615          * other shitty functions like editUpdates and such so it's not needed
3616          * anymore.
3617          */
3618         public function createUpdates( $rev ) {
3619                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3620                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true, null, true );
3621         }
3622
3623         /**
3624          * Generate the navigation links when browsing through an article revisions
3625          * It shows the information as:
3626          *   Revision as of \<date\>; view current revision
3627          *   \<- Previous version | Next Version -\>
3628          *
3629          * @param $oldid String: revision ID of this article revision
3630          */
3631         public function setOldSubtitle( $oldid = 0 ) {
3632                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3633
3634                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3635                         return;
3636                 }
3637
3638                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3639
3640                 # Cascade unhide param in links for easy deletion browsing
3641                 $extraParams = array();
3642                 if ( $wgRequest->getVal( 'unhide' ) ) {
3643                         $extraParams['unhide'] = 1;
3644                 }
3645
3646                 $revision = Revision::newFromId( $oldid );
3647                 $timestamp = $revision->getTimestamp();
3648
3649                 $current = ( $oldid == $this->mLatest );
3650                 $td = $wgLang->timeanddate( $timestamp, true );
3651                 $tddate = $wgLang->date( $timestamp, true );
3652                 $tdtime = $wgLang->time( $timestamp, true );
3653
3654                 $lnk = $current
3655                         ? wfMsgHtml( 'currentrevisionlink' )
3656                         : Linker::link(
3657                                 $this->mTitle,
3658                                 wfMsgHtml( 'currentrevisionlink' ),
3659                                 array(),
3660                                 $extraParams,
3661                                 array( 'known', 'noclasses' )
3662                         );
3663                 $curdiff = $current
3664                         ? wfMsgHtml( 'diff' )
3665                         : Linker::link(
3666                                 $this->mTitle,
3667                                 wfMsgHtml( 'diff' ),
3668                                 array(),
3669                                 array(
3670                                         'diff' => 'cur',
3671                                         'oldid' => $oldid
3672                                 ) + $extraParams,
3673                                 array( 'known', 'noclasses' )
3674                         );
3675                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3676                 $prevlink = $prev
3677                         ? Linker::link(
3678                                 $this->mTitle,
3679                                 wfMsgHtml( 'previousrevision' ),
3680                                 array(),
3681                                 array(
3682                                         'direction' => 'prev',
3683                                         'oldid' => $oldid
3684                                 ) + $extraParams,
3685                                 array( 'known', 'noclasses' )
3686                         )
3687                         : wfMsgHtml( 'previousrevision' );
3688                 $prevdiff = $prev
3689                         ? Linker::link(
3690                                 $this->mTitle,
3691                                 wfMsgHtml( 'diff' ),
3692                                 array(),
3693                                 array(
3694                                         'diff' => 'prev',
3695                                         'oldid' => $oldid
3696                                 ) + $extraParams,
3697                                 array( 'known', 'noclasses' )
3698                         )
3699                         : wfMsgHtml( 'diff' );
3700                 $nextlink = $current
3701                         ? wfMsgHtml( 'nextrevision' )
3702                         : Linker::link(
3703                                 $this->mTitle,
3704                                 wfMsgHtml( 'nextrevision' ),
3705                                 array(),
3706                                 array(
3707                                         'direction' => 'next',
3708                                         'oldid' => $oldid
3709                                 ) + $extraParams,
3710                                 array( 'known', 'noclasses' )
3711                         );
3712                 $nextdiff = $current
3713                         ? wfMsgHtml( 'diff' )
3714                         : Linker::link(
3715                                 $this->mTitle,
3716                                 wfMsgHtml( 'diff' ),
3717                                 array(),
3718                                 array(
3719                                         'diff' => 'next',
3720                                         'oldid' => $oldid
3721                                 ) + $extraParams,
3722                                 array( 'known', 'noclasses' )
3723                         );
3724
3725                 $cdel = '';
3726
3727                 // User can delete revisions or view deleted revisions...
3728                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3729                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3730                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3731                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3732                         } else {
3733                                 $query = array(
3734                                         'type'   => 'revision',
3735                                         'target' => $this->mTitle->getPrefixedDbkey(),
3736                                         'ids'    => $oldid
3737                                 );
3738                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3739                         }
3740                         $cdel .= ' ';
3741                 }
3742
3743                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3744                 $userlinks = Linker::revUserTools( $revision, !$unhide );
3745
3746                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
3747                         ? 'revision-info-current'
3748                         : 'revision-info';
3749
3750                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3751                         wfMsgExt(
3752                                 $infomsg,
3753                                 array( 'parseinline', 'replaceafter' ),
3754                                 $td,
3755                                 $userlinks,
3756                                 $revision->getID(),
3757                                 $tddate,
3758                                 $tdtime,
3759                                 $revision->getUser()
3760                         ) .
3761                         "</div>\n" .
3762                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3763                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3764
3765                 $wgOut->addHTML( $r );
3766         }
3767
3768         /**
3769          * This function is called right before saving the wikitext,
3770          * so we can do things like signatures and links-in-context.
3771          *
3772          * @param $text String article contents
3773          * @param $user User object: user doing the edit, $wgUser will be used if
3774          *              null is given
3775          * @param $popts ParserOptions object: parser options, default options for
3776          *               the user loaded if null given
3777          * @return string article contents with altered wikitext markup (signatures
3778          *      converted, {{subst:}}, templates, etc.)
3779          */
3780         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3781                 global $wgParser;
3782
3783                 if ( $user === null ) {
3784                         global $wgUser;
3785                         $user = $wgUser;
3786                 }
3787
3788                 if ( $popts === null ) {
3789                         $popts = ParserOptions::newFromUser( $user );
3790                 }
3791
3792                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3793         }
3794
3795         /* Caching functions */
3796
3797         /**
3798          * checkLastModified returns true if it has taken care of all
3799          * output to the client that is necessary for this request.
3800          * (that is, it has sent a cached version of the page)
3801          *
3802          * @return boolean true if cached version send, false otherwise
3803          */
3804         protected function tryFileCache() {
3805                 static $called = false;
3806
3807                 if ( $called ) {
3808                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3809                         return false;
3810                 }
3811
3812                 $called = true;
3813                 if ( $this->isFileCacheable() ) {
3814                         $cache = new HTMLFileCache( $this->mTitle );
3815                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3816                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3817                                 $cache->loadFromFileCache();
3818                                 return true;
3819                         } else {
3820                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3821                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3822                         }
3823                 } else {
3824                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3825                 }
3826
3827                 return false;
3828         }
3829
3830         /**
3831          * Check if the page can be cached
3832          * @return bool
3833          */
3834         public function isFileCacheable() {
3835                 $cacheable = false;
3836
3837                 if ( HTMLFileCache::useFileCache() ) {
3838                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3839                         // Extension may have reason to disable file caching on some pages.
3840                         if ( $cacheable ) {
3841                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3842                         }
3843                 }
3844
3845                 return $cacheable;
3846         }
3847
3848         /**
3849          * Loads page_touched and returns a value indicating if it should be used
3850          * @return boolean true if not a redirect
3851          */
3852         public function checkTouched() {
3853                 if ( !$this->mDataLoaded ) {
3854                         $this->loadPageData();
3855                 }
3856
3857                 return !$this->mIsRedirect;
3858         }
3859
3860         /**
3861          * Get the page_touched field
3862          * @return string containing GMT timestamp
3863          */
3864         public function getTouched() {
3865                 if ( !$this->mDataLoaded ) {
3866                         $this->loadPageData();
3867                 }
3868
3869                 return $this->mTouched;
3870         }
3871
3872         /**
3873          * Get the page_latest field
3874          * @return integer rev_id of current revision
3875          */
3876         public function getLatest() {
3877                 if ( !$this->mDataLoaded ) {
3878                         $this->loadPageData();
3879                 }
3880
3881                 return (int)$this->mLatest;
3882         }
3883
3884         /**
3885          * Edit an article without doing all that other stuff
3886          * The article must already exist; link tables etc
3887          * are not updated, caches are not flushed.
3888          *
3889          * @param $text String: text submitted
3890          * @param $comment String: comment submitted
3891          * @param $minor Boolean: whereas it's a minor modification
3892          */
3893         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3894                 wfProfileIn( __METHOD__ );
3895
3896                 $dbw = wfGetDB( DB_MASTER );
3897                 $revision = new Revision( array(
3898                         'page'       => $this->getId(),
3899                         'text'       => $text,
3900                         'comment'    => $comment,
3901                         'minor_edit' => $minor ? 1 : 0,
3902                         ) );
3903                 $revision->insertOn( $dbw );
3904                 $this->updateRevisionOn( $dbw, $revision );
3905
3906                 global $wgUser;
3907                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3908
3909                 wfProfileOut( __METHOD__ );
3910         }
3911
3912         /**
3913          * The onArticle*() functions are supposed to be a kind of hooks
3914          * which should be called whenever any of the specified actions
3915          * are done.
3916          *
3917          * This is a good place to put code to clear caches, for instance.
3918          *
3919          * This is called on page move and undelete, as well as edit
3920          *
3921          * @param $title Title object
3922          */
3923         public static function onArticleCreate( $title ) {
3924                 # Update existence markers on article/talk tabs...
3925                 if ( $title->isTalkPage() ) {
3926                         $other = $title->getSubjectPage();
3927                 } else {
3928                         $other = $title->getTalkPage();
3929                 }
3930
3931                 $other->invalidateCache();
3932                 $other->purgeSquid();
3933
3934                 $title->touchLinks();
3935                 $title->purgeSquid();
3936                 $title->deleteTitleProtection();
3937         }
3938
3939         /**
3940          * Clears caches when article is deleted
3941          *
3942          * @param $title Title
3943          */
3944         public static function onArticleDelete( $title ) {
3945                 # Update existence markers on article/talk tabs...
3946                 if ( $title->isTalkPage() ) {
3947                         $other = $title->getSubjectPage();
3948                 } else {
3949                         $other = $title->getTalkPage();
3950                 }
3951
3952                 $other->invalidateCache();
3953                 $other->purgeSquid();
3954
3955                 $title->touchLinks();
3956                 $title->purgeSquid();
3957
3958                 # File cache
3959                 HTMLFileCache::clearFileCache( $title );
3960
3961                 # Messages
3962                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3963                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3964                 }
3965
3966                 # Images
3967                 if ( $title->getNamespace() == NS_FILE ) {
3968                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3969                         $update->doUpdate();
3970                 }
3971
3972                 # User talk pages
3973                 if ( $title->getNamespace() == NS_USER_TALK ) {
3974                         $user = User::newFromName( $title->getText(), false );
3975                         $user->setNewtalk( false );
3976                 }
3977
3978                 # Image redirects
3979                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3980         }
3981
3982         /**
3983          * Purge caches on page update etc
3984          *
3985          * @param $title Title object
3986          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3987          */
3988         public static function onArticleEdit( $title ) {
3989                 global $wgDeferredUpdateList;
3990
3991                 // Invalidate caches of articles which include this page
3992                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3993
3994                 // Invalidate the caches of all pages which redirect here
3995                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3996
3997                 # Purge squid for this page only
3998                 $title->purgeSquid();
3999
4000                 # Clear file cache for this page only
4001                 HTMLFileCache::clearFileCache( $title );
4002         }
4003
4004         /**#@-*/
4005
4006         /**
4007          * Overriden by ImagePage class, only present here to avoid a fatal error
4008          * Called for ?action=revert
4009          */
4010         public function revert() {
4011                 global $wgOut;
4012                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4013         }
4014
4015         /**
4016          * Return a list of templates used by this article.
4017          * Uses the templatelinks table
4018          *
4019          * @return Array of Title objects
4020          */
4021         public function getUsedTemplates() {
4022                 $result = array();
4023                 $id = $this->mTitle->getArticleID();
4024
4025                 if ( $id == 0 ) {
4026                         return array();
4027                 }
4028
4029                 $dbr = wfGetDB( DB_SLAVE );
4030                 $res = $dbr->select( array( 'templatelinks' ),
4031                         array( 'tl_namespace', 'tl_title' ),
4032                         array( 'tl_from' => $id ),
4033                         __METHOD__ );
4034
4035                 if ( $res !== false ) {
4036                         foreach ( $res as $row ) {
4037                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4038                         }
4039                 }
4040
4041                 return $result;
4042         }
4043
4044         /**
4045          * Returns a list of hidden categories this page is a member of.
4046          * Uses the page_props and categorylinks tables.
4047          *
4048          * @return Array of Title objects
4049          */
4050         public function getHiddenCategories() {
4051                 $result = array();
4052                 $id = $this->mTitle->getArticleID();
4053
4054                 if ( $id == 0 ) {
4055                         return array();
4056                 }
4057
4058                 $dbr = wfGetDB( DB_SLAVE );
4059                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4060                         array( 'cl_to' ),
4061                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4062                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4063                         __METHOD__ );
4064
4065                 if ( $res !== false ) {
4066                         foreach ( $res as $row ) {
4067                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4068                         }
4069                 }
4070
4071                 return $result;
4072         }
4073
4074         /**
4075         * Return an applicable autosummary if one exists for the given edit.
4076         * @param $oldtext String: the previous text of the page.
4077         * @param $newtext String: The submitted text of the page.
4078         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
4079         * @return string An appropriate autosummary, or an empty string.
4080         */
4081         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4082                 global $wgContLang;
4083
4084                 # Decide what kind of autosummary is needed.
4085
4086                 # Redirect autosummaries
4087                 $ot = Title::newFromRedirect( $oldtext );
4088                 $rt = Title::newFromRedirect( $newtext );
4089
4090                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4091                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4092                 }
4093
4094                 # New page autosummaries
4095                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4096                         # If they're making a new article, give its text, truncated, in the summary.
4097
4098                         $truncatedtext = $wgContLang->truncate(
4099                                 str_replace( "\n", ' ', $newtext ),
4100                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4101
4102                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4103                 }
4104
4105                 # Blanking autosummaries
4106                 if ( $oldtext != '' && $newtext == '' ) {
4107                         return wfMsgForContent( 'autosumm-blank' );
4108                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4109                         # Removing more than 90% of the article
4110
4111                         $truncatedtext = $wgContLang->truncate(
4112                                 $newtext,
4113                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4114
4115                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4116                 }
4117
4118                 # If we reach this point, there's no applicable autosummary for our case, so our
4119                 # autosummary is empty.
4120                 return '';
4121         }
4122
4123         /**
4124          * Add the primary page-view wikitext to the output buffer
4125          * Saves the text into the parser cache if possible.
4126          * Updates templatelinks if it is out of date.
4127          *
4128          * @param $text String
4129          * @param $cache Boolean
4130          * @param $parserOptions mixed ParserOptions object, or boolean false
4131          */
4132         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4133                 global $wgOut;
4134
4135                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4136                 $wgOut->addParserOutput( $this->mParserOutput );
4137         }
4138
4139         /**
4140          * This does all the heavy lifting for outputWikitext, except it returns the parser
4141          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4142          * say, embedding thread pages within a discussion system (LiquidThreads)
4143          *
4144          * @param $text string
4145          * @param $cache boolean
4146          * @param $parserOptions parsing options, defaults to false
4147          * @return string containing parsed output
4148          */
4149         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4150                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4151
4152                 if ( !$parserOptions ) {
4153                         $parserOptions = $this->getParserOptions();
4154                 }
4155
4156                 $time = - wfTime();
4157                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4158                         $parserOptions, true, true, $this->getRevIdFetched() );
4159                 $time += wfTime();
4160
4161                 # Timing hack
4162                 if ( $time > 3 ) {
4163                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4164                                 $this->mTitle->getPrefixedDBkey() ) );
4165                 }
4166
4167                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4168                         $parserCache = ParserCache::singleton();
4169                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4170                 }
4171
4172                 // Make sure file cache is not used on uncacheable content.
4173                 // Output that has magic words in it can still use the parser cache
4174                 // (if enabled), though it will generally expire sooner.
4175                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4176                         $wgUseFileCache = false;
4177                 }
4178
4179                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4180
4181                 return $this->mParserOutput;
4182         }
4183
4184         /**
4185          * Get parser options suitable for rendering the primary article wikitext
4186          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
4187          * @return mixed ParserOptions object or boolean false
4188          */
4189         public function getParserOptions( $canonical = false ) {
4190                 global $wgUser, $wgLanguageCode;
4191
4192                 if ( !$this->mParserOptions || $canonical ) {
4193                         $user = !$canonical ? $wgUser : new User;
4194                         $parserOptions = new ParserOptions( $user );
4195                         $parserOptions->setTidy( true );
4196                         $parserOptions->enableLimitReport();
4197
4198                         if ( $canonical ) {
4199                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
4200                                 return $parserOptions;
4201                         }
4202                         $this->mParserOptions = $parserOptions;
4203                 }
4204                 // Clone to allow modifications of the return value without affecting cache
4205                 return clone $this->mParserOptions;
4206         }
4207
4208         /**
4209         * Get parser options suitable for rendering the primary article wikitext
4210         * @param User $user
4211         * @return ParserOptions
4212         */
4213         public function makeParserOptions( User $user ) {
4214                 $options = ParserOptions::newFromUser( $user );
4215                 $options->enableLimitReport(); // show inclusion/loop reports
4216                 $options->setTidy( true ); // fix bad HTML
4217                 return $options;
4218         }
4219
4220         /**
4221          * Updates cascading protections
4222          *
4223          * @param $parserOutput ParserOutput object, or boolean false
4224          **/
4225         protected function doCascadeProtectionUpdates( $parserOutput ) {
4226                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4227                         return;
4228                 }
4229
4230                 // templatelinks table may have become out of sync,
4231                 // especially if using variable-based transclusions.
4232                 // For paranoia, check if things have changed and if
4233                 // so apply updates to the database. This will ensure
4234                 // that cascaded protections apply as soon as the changes
4235                 // are visible.
4236
4237                 # Get templates from templatelinks
4238                 $id = $this->mTitle->getArticleID();
4239
4240                 $tlTemplates = array();
4241
4242                 $dbr = wfGetDB( DB_SLAVE );
4243                 $res = $dbr->select( array( 'templatelinks' ),
4244                         array( 'tl_namespace', 'tl_title' ),
4245                         array( 'tl_from' => $id ),
4246                         __METHOD__
4247                 );
4248
4249                 foreach ( $res as $row ) {
4250                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4251                 }
4252
4253                 # Get templates from parser output.
4254                 $poTemplates = array();
4255                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4256                         foreach ( $templates as $dbk => $id ) {
4257                                 $poTemplates["$ns:$dbk"] = true;
4258                         }
4259                 }
4260
4261                 # Get the diff
4262                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4263
4264                 if ( count( $templates_diff ) > 0 ) {
4265                         # Whee, link updates time.
4266                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4267                         $u->doUpdate();
4268                 }
4269         }
4270
4271         /**
4272          * Update all the appropriate counts in the category table, given that
4273          * we've added the categories $added and deleted the categories $deleted.
4274          *
4275          * @param $added array   The names of categories that were added
4276          * @param $deleted array The names of categories that were deleted
4277          */
4278         public function updateCategoryCounts( $added, $deleted ) {
4279                 $ns = $this->mTitle->getNamespace();
4280                 $dbw = wfGetDB( DB_MASTER );
4281
4282                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4283                 # exist, we might legitimately not create it, but it's simpler to just
4284                 # create it and then give it a negative value, since the value is bogus
4285                 # anyway.
4286                 #
4287                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4288                 $insertCats = array_merge( $added, $deleted );
4289                 if ( !$insertCats ) {
4290                         # Okay, nothing to do
4291                         return;
4292                 }
4293
4294                 $insertRows = array();
4295
4296                 foreach ( $insertCats as $cat ) {
4297                         $insertRows[] = array(
4298                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4299                                 'cat_title' => $cat
4300                         );
4301                 }
4302                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4303
4304                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4305                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4306
4307                 if ( $ns == NS_CATEGORY ) {
4308                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4309                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4310                 } elseif ( $ns == NS_FILE ) {
4311                         $addFields[]    = 'cat_files = cat_files + 1';
4312                         $removeFields[] = 'cat_files = cat_files - 1';
4313                 }
4314
4315                 if ( $added ) {
4316                         $dbw->update(
4317                                 'category',
4318                                 $addFields,
4319                                 array( 'cat_title' => $added ),
4320                                 __METHOD__
4321                         );
4322                 }
4323
4324                 if ( $deleted ) {
4325                         $dbw->update(
4326                                 'category',
4327                                 $removeFields,
4328                                 array( 'cat_title' => $deleted ),
4329                                 __METHOD__
4330                         );
4331                 }
4332         }
4333
4334         /**
4335          * Lightweight method to get the parser output for a page, checking the parser cache
4336          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4337          * consider, so it's not appropriate to use there.
4338          *
4339          * @since 1.16 (r52326) for LiquidThreads
4340          *
4341          * @param $oldid mixed integer Revision ID or null
4342          * @return ParserOutput or false if the given revsion ID is not found
4343          */
4344         public function getParserOutput( $oldid = null ) {
4345                 global $wgEnableParserCache, $wgUser;
4346
4347                 // Should the parser cache be used?
4348                 $useParserCache = $wgEnableParserCache &&
4349                         $wgUser->getStubThreshold() == 0 &&
4350                         $this->exists() &&
4351                         $oldid === null;
4352
4353                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4354
4355                 if ( $wgUser->getStubThreshold() ) {
4356                         wfIncrStats( 'pcache_miss_stub' );
4357                 }
4358
4359                 if ( $useParserCache ) {
4360                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4361                         if ( $parserOutput !== false ) {
4362                                 return $parserOutput;
4363                         }
4364                 }
4365
4366                 // Cache miss; parse and output it.
4367                 if ( $oldid === null ) {
4368                         $text = $this->getRawText();
4369                 } else {
4370                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4371                         if ( $rev === null ) {
4372                                 return false;
4373                         }
4374                         $text = $rev->getText();
4375                 }
4376
4377                 return $this->getOutputFromWikitext( $text, $useParserCache );
4378         }
4379
4380         /**
4381          * Sets the context this Article is executed in
4382          *
4383          * @param $context RequestContext
4384          * @since 1.18
4385          */
4386         public function setContext( $context ) {
4387                 $this->mContext = $context;
4388         }
4389
4390         /**
4391          * Gets the context this Article is executed in
4392          *
4393          * @return RequestContext
4394          * @since 1.18
4395          */
4396         public function getContext() {
4397                 if ( $this->mContext instanceof RequestContext ) {
4398                         return $this->mContext;
4399                 } else {
4400                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
4401                         return RequestContext::getMain();
4402                 }
4403         }
4404
4405 }
4406
4407 class PoolWorkArticleView extends PoolCounterWork {
4408
4409         /**
4410          * @var Article
4411          */
4412         private $mArticle;
4413
4414         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4415                 parent::__construct( 'ArticleView', $key );
4416                 $this->mArticle = $article;
4417                 $this->cacheable = $useParserCache;
4418                 $this->parserOptions = $parserOptions;
4419         }
4420
4421         function doWork() {
4422                 return $this->mArticle->doViewParse();
4423         }
4424
4425         function getCachedWork() {
4426                 global $wgOut;
4427
4428                 $parserCache = ParserCache::singleton();
4429                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4430
4431                 if ( $this->mArticle->mParserOutput !== false ) {
4432                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4433                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4434                         # Ensure that UI elements requiring revision ID have
4435                         # the correct version information.
4436                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4437                         return true;
4438                 }
4439                 return false;
4440         }
4441
4442         function fallback() {
4443                 return $this->mArticle->tryDirtyCache();
4444         }
4445
4446         /**
4447          * @param  $status Status
4448          */
4449         function error( $status ) {
4450                 global $wgOut;
4451
4452                 $wgOut->clearHTML(); // for release() errors
4453                 $wgOut->enableClientCache( false );
4454                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4455
4456                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4457                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4458
4459                 return false;
4460         }
4461 }