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