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  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61
  62                 return $t == null ? null : new Article( $t );
  63         }
  64
  65         /**
  66          * Tell the page view functions that this view was redirected
  67          * from another page on the wiki.
  68          * @param $from Title object.
  69          */
  70         function setRedirectedFrom( $from ) {
  71                 $this->mRedirectedFrom = $from;
  72         }
  73
  74         /**
  75          * If this page is a redirect, get its target
  76          *
  77          * The target will be fetched from the redirect table if possible.
  78          * If this page doesn't have an entry there, call insertRedirect()
  79          * @return mixed Title object, or null if this page is not a redirect
  80          */
  81         public function getRedirectTarget() {
  82                 if(!$this->mTitle || !$this->mTitle->isRedirect())
  83                         return null;
  84                 if(!is_null($this->mRedirectTarget))
  85                         return $this->mRedirectTarget;
  86
  87                 # Query the redirect table
  88                 $dbr = wfGetDB(DB_SLAVE);
  89                 $res = $dbr->select('redirect',
  90                                 array('rd_namespace', 'rd_title'),
  91                                 array('rd_from' => $this->getID()),
  92                                 __METHOD__
  93                 );
  94                 $row = $dbr->fetchObject($res);
  95                 if($row)
  96                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  97
  98                 # This page doesn't have an entry in the redirect table
  99                 return $this->mRedirectTarget = $this->insertRedirect();
 100         }
 101
 102         /**
 103          * Insert an entry for this page into the redirect table.
 104          *
 105          * Don't call this function directly unless you know what you're doing.
 106          * @return Title object
 107          */
 108         public function insertRedirect() {
 109                 $retval = Title::newFromRedirect($this->getContent());
 110                 if(!$retval)
 111                         return null;
 112                 $dbw = wfGetDB(DB_MASTER);
 113                 $dbw->replace('redirect', array('rd_from'), array(
 114                                 'rd_from' => $this->getID(),
 115                                 'rd_namespace' => $retval->getNamespace(),
 116                                 'rd_title' => $retval->getDBKey()
 117                 ), __METHOD__);
 118                 return $retval;
 119         }
 120
 121         /**
 122          * Get the Title object this page redirects to
 123          *
 124          * @return mixed false, Title of in-wiki target, or string with URL
 125          */
 126         public function followRedirect() {
 127                 $text = $this->getContent();
 128                 return $this->followRedirectText( $text );
 129         }
 130
 131         /**
 132          * Get the Title object this text redirects to
 133          *
 134          * @return mixed false, Title of in-wiki target, or string with URL
 135          */
 136         public function followRedirectText( $text ) {
 137                 $rt = Title::newFromRedirect( $text );
 138                 # process if title object is valid and not special:userlogout
 139                 if( $rt ) {
 140                         if( $rt->getInterwiki() != '' ) {
 141                                 if( $rt->isLocal() ) {
 142                                         // Offsite wikis need an HTTP redirect.
 143                                         //
 144                                         // This can be hard to reverse and may produce loops,
 145                                         // so they may be disabled in the site configuration.
 146
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157
 158                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 159                                                 // rolleyes
 160                                         } else {
 161                                                 return $rt->getFullURL();
 162                                         }
 163                                 }
 164                                 return $rt;
 165                         }
 166                 }
 167                 // No or invalid redirect
 168                 return false;
 169         }
 170
 171         /**
 172          * get the title object of the article
 173          */
 174         function getTitle() {
 175                 return $this->mTitle;
 176         }
 177
 178         /**
 179           * Clear the object
 180           * @private
 181           */
 182         function clear() {
 183                 $this->mDataLoaded    = false;
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 187                 $this->mRedirectedFrom = null; # Title object if set
 188                 $this->mRedirectTarget = null; # Title object if set
 189                 $this->mUserText =
 190                 $this->mTimestamp = $this->mComment = '';
 191                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 192                 $this->mTouched = '19700101000000';
 193                 $this->mForUpdate = false;
 194                 $this->mIsRedirect = false;
 195                 $this->mRevIdFetched = 0;
 196                 $this->mRedirectUrl = false;
 197                 $this->mLatest = false;
 198                 $this->mPreparedEdit = false;
 199         }
 200
 201         /**
 202          * Note that getContent/loadContent do not follow redirects anymore.
 203          * If you need to fetch redirectable content easily, try
 204          * the shortcut in Article::followContent()
 205          * FIXME
 206          * @todo There are still side-effects in this!
 207          *        In general, you should use the Revision class, not Article,
 208          *        to fetch text for purposes other than page views.
 209          *
 210          * @return Return the text of this revision
 211         */
 212         function getContent() {
 213                 global $wgUser, $wgOut, $wgMessageCache;
 214
 215                 wfProfileIn( __METHOD__ );
 216
 217                 if ( 0 == $this->getID() ) {
 218                         wfProfileOut( __METHOD__ );
 219                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 220
 221                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 222                                 $wgMessageCache->loadAllMessages();
 223                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 224                         } else {
 225                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 226                         }
 227
 228                         return "<div class='noarticletext'>\n$ret\n</div>";
 229                 } else {
 230                         $this->loadContent();
 231                         wfProfileOut( __METHOD__ );
 232                         return $this->mContent;
 233                 }
 234         }
 235
 236         /**
 237          * This function returns the text of a section, specified by a number ($section).
 238          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 239          * the first section before any such heading (section 0).
 240          *
 241          * If a section contains subsections, these are also returned.
 242          *
 243          * @param $text String: text to look in
 244          * @param $section Integer: section number
 245          * @return string text of the requested section
 246          * @deprecated
 247          */
 248         function getSection($text,$section) {
 249                 global $wgParser;
 250                 return $wgParser->getSection( $text, $section );
 251         }
 252
 253         /**
 254          * @return int The oldid of the article that is to be shown, 0 for the
 255          *             current revision
 256          */
 257         function getOldID() {
 258                 if ( is_null( $this->mOldId ) ) {
 259                         $this->mOldId = $this->getOldIDFromRequest();
 260                 }
 261                 return $this->mOldId;
 262         }
 263
 264         /**
 265          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 266          *
 267          * @return int The old id for the request
 268          */
 269         public function getOldIDFromRequest() {
 270                 global $wgRequest;
 271                 $this->mRedirectUrl = false;
 272                 $oldid = $wgRequest->getVal( 'oldid' );
 273                 if ( isset( $oldid ) ) {
 274                         $oldid = intval( $oldid );
 275                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 276                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 277                                 if ( $nextid  ) {
 278                                         $oldid = $nextid;
 279                                 } else {
 280                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 281                                 }
 282                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 283                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 284                                 if ( $previd ) {
 285                                         $oldid = $previd;
 286                                 } else {
 287                                         # TODO
 288                                 }
 289                         }
 290                         # unused:
 291                         # $lastid = $oldid;
 292                 }
 293
 294                 if ( !$oldid ) {
 295                         $oldid = 0;
 296                 }
 297                 return $oldid;
 298         }
 299
 300         /**
 301          * Load the revision (including text) into this object
 302          */
 303         function loadContent() {
 304                 if ( $this->mContentLoaded ) return;
 305
 306                 # Query variables :P
 307                 $oldid = $this->getOldID();
 308
 309                 # Pre-fill content with error message so that if something
 310                 # fails we'll have something telling us what we intended.
 311                 $this->mOldId = $oldid;
 312                 $this->fetchContent( $oldid );
 313         }
 314
 315
 316         /**
 317          * Fetch a page record with the given conditions
 318          * @param Database $dbr
 319          * @param array    $conditions
 320          * @private
 321          */
 322         function pageData( $dbr, $conditions ) {
 323                 $fields = array(
 324                                 'page_id',
 325                                 'page_namespace',
 326                                 'page_title',
 327                                 'page_restrictions',
 328                                 'page_counter',
 329                                 'page_is_redirect',
 330                                 'page_is_new',
 331                                 'page_random',
 332                                 'page_touched',
 333                                 'page_latest',
 334                                 'page_len',
 335                 );
 336                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 337                 $row = $dbr->selectRow(
 338                         'page',
 339                         $fields,
 340                         $conditions,
 341                         __METHOD__
 342                 );
 343                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 344                 return $row ;
 345         }
 346
 347         /**
 348          * @param Database $dbr
 349          * @param Title $title
 350          */
 351         function pageDataFromTitle( $dbr, $title ) {
 352                 return $this->pageData( $dbr, array(
 353                         'page_namespace' => $title->getNamespace(),
 354                         'page_title'     => $title->getDBkey() ) );
 355         }
 356
 357         /**
 358          * @param Database $dbr
 359          * @param int $id
 360          */
 361         function pageDataFromId( $dbr, $id ) {
 362                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 363         }
 364
 365         /**
 366          * Set the general counter, title etc data loaded from
 367          * some source.
 368          *
 369          * @param object $data
 370          * @private
 371          */
 372         function loadPageData( $data = 'fromdb' ) {
 373                 if ( $data === 'fromdb' ) {
 374                         $dbr = wfGetDB( DB_MASTER );
 375                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 376                 }
 377
 378                 $lc = LinkCache::singleton();
 379                 if ( $data ) {
 380                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 381
 382                         $this->mTitle->mArticleID = $data->page_id;
 383
 384                         # Old-fashioned restrictions.
 385                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 386
 387                         $this->mCounter     = $data->page_counter;
 388                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 389                         $this->mIsRedirect  = $data->page_is_redirect;
 390                         $this->mLatest      = $data->page_latest;
 391                 } else {
 392                         if ( is_object( $this->mTitle ) ) {
 393                                 $lc->addBadLinkObj( $this->mTitle );
 394                         }
 395                         $this->mTitle->mArticleID = 0;
 396                 }
 397
 398                 $this->mDataLoaded  = true;
 399         }
 400
 401         /**
 402          * Get text of an article from database
 403          * Does *NOT* follow redirects.
 404          * @param int $oldid 0 for whatever the latest revision is
 405          * @return string
 406          */
 407         function fetchContent( $oldid = 0 ) {
 408                 if ( $this->mContentLoaded ) {
 409                         return $this->mContent;
 410                 }
 411
 412                 $dbr = wfGetDB( DB_MASTER );
 413
 414                 # Pre-fill content with error message so that if something
 415                 # fails we'll have something telling us what we intended.
 416                 $t = $this->mTitle->getPrefixedText();
 417                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 418                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 419
 420                 if( $oldid ) {
 421                         $revision = Revision::newFromId( $oldid );
 422                         if( is_null( $revision ) ) {
 423                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 424                                 return false;
 425                         }
 426                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 427                         if( !$data ) {
 428                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 429                                 return false;
 430                         }
 431                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 432                         $this->loadPageData( $data );
 433                 } else {
 434                         if( !$this->mDataLoaded ) {
 435                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 436                                 if( !$data ) {
 437                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 438                                         return false;
 439                                 }
 440                                 $this->loadPageData( $data );
 441                         }
 442                         $revision = Revision::newFromId( $this->mLatest );
 443                         if( is_null( $revision ) ) {
 444                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 445                                 return false;
 446                         }
 447                 }
 448
 449                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 450                 // We should instead work with the Revision object when we need it...
 451                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 452
 453                 $this->mUser      = $revision->getUser();
 454                 $this->mUserText  = $revision->getUserText();
 455                 $this->mComment   = $revision->getComment();
 456                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 457
 458                 $this->mRevIdFetched = $revision->getId();
 459                 $this->mContentLoaded = true;
 460                 $this->mRevision =& $revision;
 461
 462                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 463
 464                 return $this->mContent;
 465         }
 466
 467         /**
 468          * Read/write accessor to select FOR UPDATE
 469          *
 470          * @param $x Mixed: FIXME
 471          */
 472         function forUpdate( $x = NULL ) {
 473                 return wfSetVar( $this->mForUpdate, $x );
 474         }
 475
 476         /**
 477          * Get the database which should be used for reads
 478          *
 479          * @return Database
 480          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 481          */
 482         function getDB() {
 483                 wfDeprecated( __METHOD__ );
 484                 return wfGetDB( DB_MASTER );
 485         }
 486
 487         /**
 488          * Get options for all SELECT statements
 489          *
 490          * @param $options Array: an optional options array which'll be appended to
 491          *                       the default
 492          * @return Array: options
 493          */
 494         function getSelectOptions( $options = '' ) {
 495                 if ( $this->mForUpdate ) {
 496                         if ( is_array( $options ) ) {
 497                                 $options[] = 'FOR UPDATE';
 498                         } else {
 499                                 $options = 'FOR UPDATE';
 500                         }
 501                 }
 502                 return $options;
 503         }
 504
 505         /**
 506          * @return int Page ID
 507          */
 508         function getID() {
 509                 if( $this->mTitle ) {
 510                         return $this->mTitle->getArticleID();
 511                 } else {
 512                         return 0;
 513                 }
 514         }
 515
 516         /**
 517          * @return bool Whether or not the page exists in the database
 518          */
 519         function exists() {
 520                 return $this->getId() != 0;
 521         }
 522
 523         /**
 524          * @return int The view count for the page
 525          */
 526         function getCount() {
 527                 if ( -1 == $this->mCounter ) {
 528                         $id = $this->getID();
 529                         if ( $id == 0 ) {
 530                                 $this->mCounter = 0;
 531                         } else {
 532                                 $dbr = wfGetDB( DB_SLAVE );
 533                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 534                                         'Article::getCount', $this->getSelectOptions() );
 535                         }
 536                 }
 537                 return $this->mCounter;
 538         }
 539
 540         /**
 541          * Determine whether a page  would be suitable for being counted as an
 542          * article in the site_stats table based on the title & its content
 543          *
 544          * @param $text String: text to analyze
 545          * @return bool
 546          */
 547         function isCountable( $text ) {
 548                 global $wgUseCommaCount;
 549
 550                 $token = $wgUseCommaCount ? ',' : '[[';
 551                 return
 552                         $this->mTitle->isContentPage()
 553                         && !$this->isRedirect( $text )
 554                         && in_string( $token, $text );
 555         }
 556
 557         /**
 558          * Tests if the article text represents a redirect
 559          *
 560          * @param $text String: FIXME
 561          * @return bool
 562          */
 563         function isRedirect( $text = false ) {
 564                 if ( $text === false ) {
 565                         if ( $this->mDataLoaded )
 566                                 return $this->mIsRedirect;
 567
 568                         // Apparently loadPageData was never called
 569                         $this->loadContent();
 570                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 571                 } else {
 572                         $titleObj = Title::newFromRedirect( $text );
 573                 }
 574                 return $titleObj !== NULL;
 575         }
 576
 577         /**
 578          * Returns true if the currently-referenced revision is the current edit
 579          * to this page (and it exists).
 580          * @return bool
 581          */
 582         function isCurrent() {
 583                 # If no oldid, this is the current version.
 584                 if ($this->getOldID() == 0)
 585                         return true;
 586
 587                 return $this->exists() &&
 588                         isset( $this->mRevision ) &&
 589                         $this->mRevision->isCurrent();
 590         }
 591
 592         /**
 593          * Loads everything except the text
 594          * This isn't necessary for all uses, so it's only done if needed.
 595          * @private
 596          */
 597         function loadLastEdit() {
 598                 if ( -1 != $this->mUser )
 599                         return;
 600
 601                 # New or non-existent articles have no user information
 602                 $id = $this->getID();
 603                 if ( 0 == $id ) return;
 604
 605                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 606                 if( !is_null( $this->mLastRevision ) ) {
 607                         $this->mUser      = $this->mLastRevision->getUser();
 608                         $this->mUserText  = $this->mLastRevision->getUserText();
 609                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 610                         $this->mComment   = $this->mLastRevision->getComment();
 611                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 612                         $this->mRevIdFetched = $this->mLastRevision->getId();
 613                 }
 614         }
 615
 616         function getTimestamp() {
 617                 // Check if the field has been filled by ParserCache::get()
 618                 if ( !$this->mTimestamp ) {
 619                         $this->loadLastEdit();
 620                 }
 621                 return wfTimestamp(TS_MW, $this->mTimestamp);
 622         }
 623
 624         function getUser() {
 625                 $this->loadLastEdit();
 626                 return $this->mUser;
 627         }
 628
 629         function getUserText() {
 630                 $this->loadLastEdit();
 631                 return $this->mUserText;
 632         }
 633
 634         function getComment() {
 635                 $this->loadLastEdit();
 636                 return $this->mComment;
 637         }
 638
 639         function getMinorEdit() {
 640                 $this->loadLastEdit();
 641                 return $this->mMinorEdit;
 642         }
 643
 644         function getRevIdFetched() {
 645                 $this->loadLastEdit();
 646                 return $this->mRevIdFetched;
 647         }
 648
 649         /**
 650          * @param $limit Integer: default 0.
 651          * @param $offset Integer: default 0.
 652          */
 653         function getContributors($limit = 0, $offset = 0) {
 654                 # XXX: this is expensive; cache this info somewhere.
 655
 656                 $contribs = array();
 657                 $dbr = wfGetDB( DB_SLAVE );
 658                 $revTable = $dbr->tableName( 'revision' );
 659                 $userTable = $dbr->tableName( 'user' );
 660                 $user = $this->getUser();
 661                 $pageId = $this->getId();
 662
 663                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 664                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 665                         WHERE rev_page = $pageId
 666                         AND rev_user != $user
 667                         GROUP BY rev_user, rev_user_text, user_real_name
 668                         ORDER BY timestamp DESC";
 669
 670                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 671                 if ($offset > 0) { $sql .= ' OFFSET '.$offset; }
 672
 673                 $sql .= ' '. $this->getSelectOptions();
 674
 675                 $res = $dbr->query($sql, __METHOD__ );
 676
 677                 return new UserArrayFromResult( $res );
 678         }
 679
 680         /**
 681          * This is the default action of the script: just view the page of
 682          * the given title.
 683         */
 684         function view() {
 685                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 686                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 687                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 688                 global $wgDefaultRobotPolicy;
 689                 $sk = $wgUser->getSkin();
 690
 691                 wfProfileIn( __METHOD__ );
 692
 693                 $parserCache = ParserCache::singleton();
 694                 $ns = $this->mTitle->getNamespace(); # shortcut
 695
 696                 # Get variables from query string
 697                 $oldid = $this->getOldID();
 698
 699                 # getOldID may want us to redirect somewhere else
 700                 if ( $this->mRedirectUrl ) {
 701                         $wgOut->redirect( $this->mRedirectUrl );
 702                         wfProfileOut( __METHOD__ );
 703                         return;
 704                 }
 705
 706                 $diff = $wgRequest->getVal( 'diff' );
 707                 $rcid = $wgRequest->getVal( 'rcid' );
 708                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 709                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 710                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 711
 712                 $wgOut->setArticleFlag( true );
 713
 714                 # Discourage indexing of printable versions, but encourage following
 715                 if( $wgOut->isPrintable() ) {
 716                         $policy = 'noindex,follow';
 717                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 718                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 719                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 720                         # Honour customised robot policies for this namespace
 721                         $policy = $wgNamespaceRobotPolicies[$ns];
 722                 } else {
 723                         $policy = $wgDefaultRobotPolicy;
 724                 }
 725                 $wgOut->setRobotPolicy( $policy );
 726
 727                 # If we got diff and oldid in the query, we want to see a
 728                 # diff page instead of the article.
 729
 730                 if ( !is_null( $diff ) ) {
 731                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 732
 733                         $diff = $wgRequest->getVal( 'diff' );
 734                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 735                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 736                         // DifferenceEngine directly fetched the revision:
 737                         $this->mRevIdFetched = $de->mNewid;
 738                         $de->showDiffPage( $diffOnly );
 739
 740                         // Needed to get the page's current revision
 741                         $this->loadPageData();
 742                         if( $diff == 0 || $diff == $this->mLatest ) {
 743                                 # Run view updates for current revision only
 744                                 $this->viewUpdates();
 745                         }
 746                         wfProfileOut( __METHOD__ );
 747                         return;
 748                 }
 749
 750                 if ( empty( $oldid ) && $this->checkTouched() ) {
 751                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 752
 753                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 754                                 wfProfileOut( __METHOD__ );
 755                                 return;
 756                         } else if ( $this->tryFileCache() ) {
 757                                 # tell wgOut that output is taken care of
 758                                 $wgOut->disable();
 759                                 $this->viewUpdates();
 760                                 wfProfileOut( __METHOD__ );
 761                                 return;
 762                         }
 763                 }
 764
 765                 # Should the parser cache be used?
 766                 $pcache = $this->useParserCache( $oldid );
 767                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 768                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 769                         wfIncrStats( 'pcache_miss_stub' );
 770                 }
 771
 772                 $wasRedirected = false;
 773                 if ( isset( $this->mRedirectedFrom ) ) {
 774                         // This is an internally redirected page view.
 775                         // We'll need a backlink to the source page for navigation.
 776                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 777                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 778                                 $s = wfMsg( 'redirectedfrom', $redir );
 779                                 $wgOut->setSubtitle( $s );
 780
 781                                 // Set the fragment if one was specified in the redirect
 782                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 783                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 784                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 785                                 }
 786                                 $wasRedirected = true;
 787                         }
 788                 } elseif ( !empty( $rdfrom ) ) {
 789                         // This is an externally redirected view, from some other wiki.
 790                         // If it was reported from a trusted site, supply a backlink.
 791                         global $wgRedirectSources;
 792                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 793                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 794                                 $s = wfMsg( 'redirectedfrom', $redir );
 795                                 $wgOut->setSubtitle( $s );
 796                                 $wasRedirected = true;
 797                         }
 798                 }
 799
 800                 $outputDone = false;
 801                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 802                 if ( $pcache ) {
 803                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 804                                 // Ensure that UI elements requiring revision ID have
 805                                 // the correct version information.
 806                                 $wgOut->setRevisionId( $this->mLatest );
 807                                 $outputDone = true;
 808                         }
 809                 }
 810                 # Fetch content and check for errors
 811                 if ( !$outputDone ) {
 812                         # If the article does not exist and was deleted, show the log
 813                         if ($this->getID() == 0) {
 814                                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 815                                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 816                                 $count = $pager->getNumRows();
 817                                 if( $count > 0 ) {
 818                                         $pager->mLimit = 10;
 819                                         $wgOut->addHtml( '<div class="mw-warning-with-logexcerpt">' );
 820                                         $wgOut->addWikiMsg( 'deleted-notice' );
 821                                         $wgOut->addHTML(
 822                                                 $loglist->beginLogEventsList() .
 823                                                 $pager->getBody() .
 824                                                 $loglist->endLogEventsList()
 825                                         );
 826                                         if($count > 10){
 827                                                 $wgOut->addHtml( $wgUser->getSkin()->link(
 828                                                         SpecialPage::getTitleFor( 'Log' ),
 829                                                         wfMsgHtml( 'deletelog-fulllog' ),
 830                                                         array(),
 831                                                         array(
 832                                                                 'type' => 'delete',
 833                                                                 'page' => $this->mTitle->getPrefixedText() ) ) );
 834                                         }
 835                                         $wgOut->addHtml( '</div>' );
 836                                 }
 837                         }
 838                         $text = $this->getContent();
 839                         if ( $text === false ) {
 840                                 # Failed to load, replace text with error message
 841                                 $t = $this->mTitle->getPrefixedText();
 842                                 if( $oldid ) {
 843                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 844                                         $text = wfMsg( 'missing-article', $t, $d );
 845                                 } else {
 846                                         $text = wfMsg( 'noarticletext' );
 847                                 }
 848                         }
 849
 850                         # Another whitelist check in case oldid is altering the title
 851                         if ( !$this->mTitle->userCanRead() ) {
 852                                 $wgOut->loginToUse();
 853                                 $wgOut->output();
 854                                 wfProfileOut( __METHOD__ );
 855                                 exit;
 856                         }
 857
 858                         # We're looking at an old revision
 859                         if ( !empty( $oldid ) ) {
 860                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 861                                 if( is_null( $this->mRevision ) ) {
 862                                         // FIXME: This would be a nice place to load the 'no such page' text.
 863                                 } else {
 864                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 865                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 866                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 867                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 868                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 869                                                         wfProfileOut( __METHOD__ );
 870                                                         return;
 871                                                 } else {
 872                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 873                                                         // and we are allowed to see...
 874                                                 }
 875                                         }
 876                                 }
 877                         }
 878
 879                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 880
 881                          // Pages containing custom CSS or JavaScript get special treatment
 882                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 883                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 884                                 // Give hooks a chance to customise the output
 885                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 886                                         // Wrap the whole lot in a <pre> and don't parse
 887                                         $m = array();
 888                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 889                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 890                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 891                                         $wgOut->addHtml( "\n</pre>\n" );
 892                                 }
 893                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 894                                 # Don't append the subtitle if this was an old revision
 895                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 896                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 897                                 $wgOut->addParserOutputNoText( $parseout );
 898                         } else if ( $pcache ) {
 899                                 # Display content and save to parser cache
 900                                 $this->outputWikiText( $text );
 901                         } else {
 902                                 # Display content, don't attempt to save to parser cache
 903                                 # Don't show section-edit links on old revisions... this way lies madness.
 904                                 if( !$this->isCurrent() ) {
 905                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 906                                 }
 907                                 # Display content and don't save to parser cache
 908                                 # With timing hack -- TS 2006-07-26
 909                                 $time = -wfTime();
 910                                 $this->outputWikiText( $text, false );
 911                                 $time += wfTime();
 912
 913                                 # Timing hack
 914                                 if ( $time > 3 ) {
 915                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 916                                                 $this->mTitle->getPrefixedDBkey()));
 917                                 }
 918
 919                                 if( !$this->isCurrent() ) {
 920                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 921                                 }
 922                         }
 923                 }
 924                 /* title may have been set from the cache */
 925                 $t = $wgOut->getPageTitle();
 926                 if( empty( $t ) ) {
 927                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 928
 929                         # For the main page, overwrite the <title> element with the con-
 930                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 931                         # that's not empty).
 932                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 933                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 934                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 935                         }
 936                 }
 937
 938                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 939                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 940                         $wgOut->addWikiMsg('anontalkpagetext');
 941                 }
 942
 943                 # If we have been passed an &rcid= parameter, we want to give the user a
 944                 # chance to mark this new article as patrolled.
 945                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 946                         $wgOut->addHTML(
 947                                 "<div class='patrollink'>" .
 948                                         wfMsgHtml( 'markaspatrolledlink',
 949                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 950                                                 "action=markpatrolled&rcid=$rcid" )
 951                                         ) .
 952                                 '</div>'
 953                          );
 954                 }
 955
 956                 # Trackbacks
 957                 if ($wgUseTrackbacks)
 958                         $this->addTrackbacks();
 959
 960                 $this->viewUpdates();
 961                 wfProfileOut( __METHOD__ );
 962         }
 963
 964         /*
 965         * Should the parser cache be used?
 966         */
 967         protected function useParserCache( $oldid ) {
 968                 global $wgUser, $wgEnableParserCache;
 969
 970                 return $wgEnableParserCache
 971                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 972                         && $this->exists()
 973                         && empty( $oldid )
 974                         && !$this->mTitle->isCssOrJsPage()
 975                         && !$this->mTitle->isCssJsSubpage();
 976         }
 977
 978         /**
 979          * View redirect
 980          * @param Title $target Title of destination to redirect
 981          * @param Bool  $appendSubtitle Object[optional]
 982          * @param Bool  $forceKnown Should the image be shown as a bluelink regardless of existence?
 983          */
 984         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 985                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 986
 987                 # Display redirect
 988                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 989                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 990
 991                 if( $appendSubtitle ) {
 992                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 993                 }
 994                 $sk = $wgUser->getSkin();
 995                 if ( $forceKnown )
 996                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 997                 else
 998                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 999
1000                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1001                         '<span class="redirectText">'.$link.'</span>';
1002
1003         }
1004
1005         function addTrackbacks() {
1006                 global $wgOut, $wgUser;
1007
1008                 $dbr = wfGetDB(DB_SLAVE);
1009                 $tbs = $dbr->select(
1010                                 /* FROM   */ 'trackbacks',
1011                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1012                                 /* WHERE  */ array('tb_page' => $this->getID())
1013                 );
1014
1015                 if (!$dbr->numrows($tbs))
1016                         return;
1017
1018                 $tbtext = "";
1019                 while ($o = $dbr->fetchObject($tbs)) {
1020                         $rmvtxt = "";
1021                         if ($wgUser->isAllowed( 'trackback' )) {
1022                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
1023                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1024                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1025                         }
1026                         $tbtext .= "\n";
1027                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1028                                         $o->tb_title,
1029                                         $o->tb_url,
1030                                         $o->tb_ex,
1031                                         $o->tb_name,
1032                                         $rmvtxt);
1033                 }
1034                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1035         }
1036
1037         function deletetrackback() {
1038                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1039
1040                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
1041                         $wgOut->addWikiMsg( 'sessionfailure' );
1042                         return;
1043                 }
1044
1045                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1046
1047                 if (count($permission_errors)>0)
1048                 {
1049                         $wgOut->showPermissionsErrorPage( $permission_errors );
1050                         return;
1051                 }
1052
1053                 $db = wfGetDB(DB_MASTER);
1054                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1055                 $wgTitle->invalidateCache();
1056                 $wgOut->addWikiMsg('trackbackdeleteok');
1057         }
1058
1059         function render() {
1060                 global $wgOut;
1061
1062                 $wgOut->setArticleBodyOnly(true);
1063                 $this->view();
1064         }
1065
1066         /**
1067          * Handle action=purge
1068          */
1069         function purge() {
1070                 global $wgUser, $wgRequest, $wgOut;
1071
1072                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1073                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1074                                 $this->doPurge();
1075                                 $this->view();
1076                         }
1077                 } else {
1078                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1079                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1080                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1081                         $msg = str_replace( '$1',
1082                                 "<form method=\"post\" action=\"$action\">\n" .
1083                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1084                                 "</form>\n", $msg );
1085
1086                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1087                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1088                         $wgOut->addHTML( $msg );
1089                 }
1090         }
1091
1092         /**
1093          * Perform the actions of a page purging
1094          */
1095         function doPurge() {
1096                 global $wgUseSquid;
1097                 // Invalidate the cache
1098                 $this->mTitle->invalidateCache();
1099
1100                 if ( $wgUseSquid ) {
1101                         // Commit the transaction before the purge is sent
1102                         $dbw = wfGetDB( DB_MASTER );
1103                         $dbw->immediateCommit();
1104
1105                         // Send purge
1106                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1107                         $update->doUpdate();
1108                 }
1109                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1110                         global $wgMessageCache;
1111                         if ( $this->getID() == 0 ) {
1112                                 $text = false;
1113                         } else {
1114                                 $text = $this->getContent();
1115                         }
1116                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1117                 }
1118         }
1119
1120         /**
1121          * Insert a new empty page record for this article.
1122          * This *must* be followed up by creating a revision
1123          * and running $this->updateToLatest( $rev_id );
1124          * or else the record will be left in a funky state.
1125          * Best if all done inside a transaction.
1126          *
1127          * @param Database $dbw
1128          * @return int     The newly created page_id key, or false if the title already existed
1129          * @private
1130          */
1131         function insertOn( $dbw ) {
1132                 wfProfileIn( __METHOD__ );
1133
1134                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1135                 $dbw->insert( 'page', array(
1136                         'page_id'           => $page_id,
1137                         'page_namespace'    => $this->mTitle->getNamespace(),
1138                         'page_title'        => $this->mTitle->getDBkey(),
1139                         'page_counter'      => 0,
1140                         'page_restrictions' => '',
1141                         'page_is_redirect'  => 0, # Will set this shortly...
1142                         'page_is_new'       => 1,
1143                         'page_random'       => wfRandom(),
1144                         'page_touched'      => $dbw->timestamp(),
1145                         'page_latest'       => 0, # Fill this in shortly...
1146                         'page_len'          => 0, # Fill this in shortly...
1147                 ), __METHOD__, 'IGNORE' );
1148
1149                 $affected = $dbw->affectedRows();
1150                 if ( $affected ) {
1151                         $newid = $dbw->insertId();
1152                         $this->mTitle->resetArticleId( $newid );
1153                 }
1154                 wfProfileOut( __METHOD__ );
1155                 return $affected ? $newid : false;
1156         }
1157
1158         /**
1159          * Update the page record to point to a newly saved revision.
1160          *
1161          * @param Database $dbw
1162          * @param Revision $revision For ID number, and text used to set
1163                                      length and redirect status fields
1164          * @param int $lastRevision If given, will not overwrite the page field
1165          *                          when different from the currently set value.
1166          *                          Giving 0 indicates the new page flag should
1167          *                          be set on.
1168          * @param bool $lastRevIsRedirect If given, will optimize adding and
1169          *                                                      removing rows in redirect table.
1170          * @return bool true on success, false on failure
1171          * @private
1172          */
1173         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1174                 wfProfileIn( __METHOD__ );
1175
1176                 $text = $revision->getText();
1177                 $rt = Title::newFromRedirect( $text );
1178
1179                 $conditions = array( 'page_id' => $this->getId() );
1180                 if( !is_null( $lastRevision ) ) {
1181                         # An extra check against threads stepping on each other
1182                         $conditions['page_latest'] = $lastRevision;
1183                 }
1184
1185                 $dbw->update( 'page',
1186                         array( /* SET */
1187                                 'page_latest'      => $revision->getId(),
1188                                 'page_touched'     => $dbw->timestamp(),
1189                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1190                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1191                                 'page_len'         => strlen( $text ),
1192                         ),
1193                         $conditions,
1194                         __METHOD__ );
1195
1196                 $result = $dbw->affectedRows() != 0;
1197
1198                 if ($result) {
1199                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1200                 }
1201
1202                 wfProfileOut( __METHOD__ );
1203                 return $result;
1204         }
1205
1206         /**
1207          * Add row to the redirect table if this is a redirect, remove otherwise.
1208          *
1209          * @param Database $dbw
1210          * @param $redirectTitle a title object pointing to the redirect target,
1211          *                                                      or NULL if this is not a redirect
1212          * @param bool $lastRevIsRedirect If given, will optimize adding and
1213          *                                                      removing rows in redirect table.
1214          * @return bool true on success, false on failure
1215          * @private
1216          */
1217         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1218
1219                 // Always update redirects (target link might have changed)
1220                 // Update/Insert if we don't know if the last revision was a redirect or not
1221                 // Delete if changing from redirect to non-redirect
1222                 $isRedirect = !is_null($redirectTitle);
1223                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1224
1225                         wfProfileIn( __METHOD__ );
1226
1227                         if ($isRedirect) {
1228
1229                                 // This title is a redirect, Add/Update row in the redirect table
1230                                 $set = array( /* SET */
1231                                         'rd_namespace' => $redirectTitle->getNamespace(),
1232                                         'rd_title'     => $redirectTitle->getDBkey(),
1233                                         'rd_from'      => $this->getId(),
1234                                 );
1235
1236                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1237                         } else {
1238                                 // This is not a redirect, remove row from redirect table
1239                                 $where = array( 'rd_from' => $this->getId() );
1240                                 $dbw->delete( 'redirect', $where, __METHOD__);
1241                         }
1242
1243                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1244                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1245                         wfProfileOut( __METHOD__ );
1246                         return ( $dbw->affectedRows() != 0 );
1247                 }
1248
1249                 return true;
1250         }
1251
1252         /**
1253          * If the given revision is newer than the currently set page_latest,
1254          * update the page record. Otherwise, do nothing.
1255          *
1256          * @param Database $dbw
1257          * @param Revision $revision
1258          */
1259         function updateIfNewerOn( &$dbw, $revision ) {
1260                 wfProfileIn( __METHOD__ );
1261
1262                 $row = $dbw->selectRow(
1263                         array( 'revision', 'page' ),
1264                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1265                         array(
1266                                 'page_id' => $this->getId(),
1267                                 'page_latest=rev_id' ),
1268                         __METHOD__ );
1269                 if( $row ) {
1270                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1271                                 wfProfileOut( __METHOD__ );
1272                                 return false;
1273                         }
1274                         $prev = $row->rev_id;
1275                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1276                 } else {
1277                         # No or missing previous revision; mark the page as new
1278                         $prev = 0;
1279                         $lastRevIsRedirect = null;
1280                 }
1281
1282                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1283                 wfProfileOut( __METHOD__ );
1284                 return $ret;
1285         }
1286
1287         /**
1288          * @return string Complete article text, or null if error
1289          */
1290         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1291                 wfProfileIn( __METHOD__ );
1292
1293                 if( $section == '' ) {
1294                         // Whole-page edit; let the text through unmolested.
1295                 } else {
1296                         if( is_null( $edittime ) ) {
1297                                 $rev = Revision::newFromTitle( $this->mTitle );
1298                         } else {
1299                                 $dbw = wfGetDB( DB_MASTER );
1300                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1301                         }
1302                         if( is_null( $rev ) ) {
1303                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1304                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1305                                 return null;
1306                         }
1307                         $oldtext = $rev->getText();
1308
1309                         if( $section == 'new' ) {
1310                                 # Inserting a new section
1311                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1312                                 $text = strlen( trim( $oldtext ) ) > 0
1313                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1314                                                 : "{$subject}{$text}";
1315                         } else {
1316                                 # Replacing an existing section; roll out the big guns
1317                                 global $wgParser;
1318                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1319                         }
1320
1321                 }
1322
1323                 wfProfileOut( __METHOD__ );
1324                 return $text;
1325         }
1326
1327         /**
1328          * @deprecated use Article::doEdit()
1329          */
1330         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1331                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1332                         ( $isminor ? EDIT_MINOR : 0 ) |
1333                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1334                         ( $bot ? EDIT_FORCE_BOT : 0 );
1335
1336                 # If this is a comment, add the summary as headline
1337                 if ( $comment && $summary != "" ) {
1338                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1339                 }
1340
1341                 $this->doEdit( $text, $summary, $flags );
1342
1343                 $dbw = wfGetDB( DB_MASTER );
1344                 if ($watchthis) {
1345                         if (!$this->mTitle->userIsWatching()) {
1346                                 $dbw->begin();
1347                                 $this->doWatch();
1348                                 $dbw->commit();
1349                         }
1350                 } else {
1351                         if ( $this->mTitle->userIsWatching() ) {
1352                                 $dbw->begin();
1353                                 $this->doUnwatch();
1354                                 $dbw->commit();
1355                         }
1356                 }
1357                 $this->doRedirect( $this->isRedirect( $text ) );
1358         }
1359
1360         /**
1361          * @deprecated use Article::doEdit()
1362          */
1363         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1364                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1365                         ( $minor ? EDIT_MINOR : 0 ) |
1366                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1367
1368                 $status = $this->doEdit( $text, $summary, $flags );
1369                 if ( !$status->isOK() ) {
1370                         return false;
1371                 }
1372
1373                 $dbw = wfGetDB( DB_MASTER );
1374                 if ($watchthis) {
1375                         if (!$this->mTitle->userIsWatching()) {
1376                                 $dbw->begin();
1377                                 $this->doWatch();
1378                                 $dbw->commit();
1379                         }
1380                 } else {
1381                         if ( $this->mTitle->userIsWatching() ) {
1382                                 $dbw->begin();
1383                                 $this->doUnwatch();
1384                                 $dbw->commit();
1385                         }
1386                 }
1387
1388                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1389                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1390
1391                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1392                 return true;
1393         }
1394
1395         /**
1396          * Article::doEdit()
1397          *
1398          * Change an existing article or create a new article. Updates RC and all necessary caches,
1399          * optionally via the deferred update array.
1400          *
1401          * $wgUser must be set before calling this function.
1402          *
1403          * @param string $text New text
1404          * @param string $summary Edit summary
1405          * @param integer $flags bitfield:
1406          *      EDIT_NEW
1407          *          Article is known or assumed to be non-existent, create a new one
1408          *      EDIT_UPDATE
1409          *          Article is known or assumed to be pre-existing, update it
1410          *      EDIT_MINOR
1411          *          Mark this edit minor, if the user is allowed to do so
1412          *      EDIT_SUPPRESS_RC
1413          *          Do not log the change in recentchanges
1414          *      EDIT_FORCE_BOT
1415          *          Mark the edit a "bot" edit regardless of user rights
1416          *      EDIT_DEFER_UPDATES
1417          *          Defer some of the updates until the end of index.php
1418          *      EDIT_AUTOSUMMARY
1419          *          Fill in blank summaries with generated text where possible
1420          *
1421          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1422          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1423          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1424          * edit-already-exists error will be returned. These two conditions are also possible with
1425          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1426          *
1427          * @param $baseRevId, the revision ID this edit was based off, if any
1428          *
1429          * @return Status object. Possible errors:
1430          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1431          *     edit-gone-missing:       In update mode, but the article didn't exist
1432          *     edit-conflict:           In update mode, the article changed unexpectedly
1433          *     edit-no-change:          Warning that the text was the same as before
1434          *     edit-already-exists:     In creation mode, but the article already exists
1435          *
1436          *  Extensions may define additional errors.
1437          *
1438          *  $return->value will contain an associative array with members as follows:
1439          *     new:                     Boolean indicating if the function attempted to create a new article
1440          *     revision:                The revision object for the inserted revision, or null
1441          *
1442          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1443          */
1444         function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1445                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1446
1447                 # Low-level sanity check
1448                 if( $this->mTitle->getText() == '' ) {
1449                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1450                 }
1451
1452                 wfProfileIn( __METHOD__ );
1453
1454                 if ($user == null) {
1455                         $user = $wgUser;
1456                 }
1457                 $status = Status::newGood( array() );
1458
1459                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1460                 $this->loadPageData();
1461
1462                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1463                         $aid = $this->mTitle->getArticleID();
1464                         if ( $aid ) {
1465                                 $flags |= EDIT_UPDATE;
1466                         } else {
1467                                 $flags |= EDIT_NEW;
1468                         }
1469                 }
1470
1471                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text,
1472                         &$summary, $flags & EDIT_MINOR,
1473                         null, null, &$flags, &$status ) ) )
1474                 {
1475                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1476                         wfProfileOut( __METHOD__ );
1477                         if ( $status->isOK() ) {
1478                                 $status->fatal( 'edit-hook-aborted');
1479                         }
1480                         return $status;
1481                 }
1482
1483                 # Silently ignore EDIT_MINOR if not allowed
1484                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1485                 $bot = $flags & EDIT_FORCE_BOT;
1486
1487                 $oldtext = $this->getContent();
1488                 $oldsize = strlen( $oldtext );
1489
1490                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1491                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1492                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1493                 }
1494
1495                 $editInfo = $this->prepareTextForEdit( $text );
1496                 $text = $editInfo->pst;
1497                 $newsize = strlen( $text );
1498
1499                 $dbw = wfGetDB( DB_MASTER );
1500                 $now = wfTimestampNow();
1501
1502                 if ( $flags & EDIT_UPDATE ) {
1503                         # Update article, but only if changed.
1504                         $status->value['new'] = false;
1505
1506                         # Make sure the revision is either completely inserted or not inserted at all
1507                         if( !$wgDBtransactions ) {
1508                                 $userAbort = ignore_user_abort( true );
1509                         }
1510
1511                         $revisionId = 0;
1512
1513                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1514
1515                         if ( $changed ) {
1516                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1517                                   - (int)$this->isCountable( $oldtext );
1518                                 $this->mTotalAdjustment = 0;
1519
1520                                 if ( !$this->mLatest ) {
1521                                         # Article gone missing
1522                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1523                                         $status->fatal( 'edit-gone-missing' );
1524                                         wfProfileOut( __METHOD__ );
1525                                         return $status;
1526                                 }
1527
1528                                 $revision = new Revision( array(
1529                                         'page'       => $this->getId(),
1530                                         'comment'    => $summary,
1531                                         'minor_edit' => $isminor,
1532                                         'text'       => $text,
1533                                         'parent_id'  => $this->mLatest,
1534                                         'user'       => $user->getId(),
1535                                         'user_text'  => $user->getName(),
1536                                         ) );
1537
1538                                 $dbw->begin();
1539                                 $revisionId = $revision->insertOn( $dbw );
1540
1541                                 # Update page
1542                                 #
1543                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1544                                 # during the course of this function. This makes sure that EditPage can detect
1545                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1546                                 # before this function is called. A previous function used a separate query, this
1547                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1548                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1549
1550                                 if( !$ok ) {
1551                                         /* Belated edit conflict! Run away!! */
1552                                         $status->fatal( 'edit-conflict' );
1553                                         # Delete the invalid revision if the DB is not transactional
1554                                         if ( !$wgDBtransactions ) {
1555                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1556                                         }
1557                                         $revisionId = 0;
1558                                         $dbw->rollback();
1559                                 } else {
1560                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId ) );
1561
1562                                         # Update recentchanges
1563                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1564                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1565                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1566                                                         $revisionId );
1567
1568                                                 # Mark as patrolled if the user can do so
1569                                                 if( $GLOBALS['wgUseRCPatrol'] && $user->isAllowed( 'autopatrol' ) ) {
1570                                                         RecentChange::markPatrolled( $rc, true );
1571                                                 }
1572                                         }
1573                                         $user->incEditCount();
1574                                         $dbw->commit();
1575                                 }
1576                         } else {
1577                                 $status->warning( 'edit-no-change' );
1578                                 $revision = null;
1579                                 // Keep the same revision ID, but do some updates on it
1580                                 $revisionId = $this->getRevIdFetched();
1581                                 // Update page_touched, this is usually implicit in the page update
1582                                 // Other cache updates are done in onArticleEdit()
1583                                 $this->mTitle->invalidateCache();
1584                         }
1585
1586                         if( !$wgDBtransactions ) {
1587                                 ignore_user_abort( $userAbort );
1588                         }
1589                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1590                         if ( !$status->isOK() ) {
1591                                 wfProfileOut( __METHOD__ );
1592                                 return $status;
1593                         }
1594
1595                         # Invalidate cache of this article and all pages using this article
1596                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1597                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1598                         # Update links tables, site stats, etc.
1599                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1600                 } else {
1601                         # Create new article
1602                         $status->value['new'] = true;
1603
1604                         # Set statistics members
1605                         # We work out if it's countable after PST to avoid counter drift
1606                         # when articles are created with {{subst:}}
1607                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1608                         $this->mTotalAdjustment = 1;
1609
1610                         $dbw->begin();
1611
1612                         # Add the page record; stake our claim on this title!
1613                         # This will return false if the article already exists
1614                         $newid = $this->insertOn( $dbw );
1615
1616                         if ( $newid === false ) {
1617                                 $dbw->rollback();
1618                                 $status->fatal( 'edit-already-exists' );
1619                                 wfProfileOut( __METHOD__ );
1620                                 return $status;
1621                         }
1622
1623                         # Save the revision text...
1624                         $revision = new Revision( array(
1625                                 'page'       => $newid,
1626                                 'comment'    => $summary,
1627                                 'minor_edit' => $isminor,
1628                                 'text'       => $text,
1629                                 'user'       => $user->getId(),
1630                                 'user_text'  => $user->getName(),
1631                                 ) );
1632                         $revisionId = $revision->insertOn( $dbw );
1633
1634                         $this->mTitle->resetArticleID( $newid );
1635
1636                         # Update the page record with revision data
1637                         $this->updateRevisionOn( $dbw, $revision, 0 );
1638
1639                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
1640
1641                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1642                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1643                                   '', strlen( $text ), $revisionId );
1644                                 # Mark as patrolled if the user can
1645                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $user->isAllowed( 'autopatrol' ) ) {
1646                                         RecentChange::markPatrolled( $rc, true );
1647                                 }
1648                         }
1649                         $user->incEditCount();
1650                         $dbw->commit();
1651
1652                         # Update links, etc.
1653                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1654
1655                         # Clear caches
1656                         Article::onArticleCreate( $this->mTitle );
1657
1658                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1659                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1660                 }
1661
1662                 # Do updates right now unless deferral was requested
1663                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1664                         wfDoUpdates();
1665                 }
1666
1667                 // Return the new revision (or null) to the caller
1668                 $status->value['revision'] = $revision;
1669
1670                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1671                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1672
1673                 wfProfileOut( __METHOD__ );
1674                 return $status;
1675         }
1676
1677         /**
1678          * @deprecated wrapper for doRedirect
1679          */
1680         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1681                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1682         }
1683
1684         /**
1685          * Output a redirect back to the article.
1686          * This is typically used after an edit.
1687          *
1688          * @param boolean $noRedir Add redirect=no
1689          * @param string $sectionAnchor section to redirect to, including "#"
1690          * @param string $extraQuery, extra query params
1691          */
1692         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1693                 global $wgOut;
1694                 if ( $noRedir ) {
1695                         $query = 'redirect=no';
1696                         if( $extraQuery )
1697                                 $query .= "&$query";
1698                 } else {
1699                         $query = $extraQuery;
1700                 }
1701                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1702         }
1703
1704         /**
1705          * Mark this particular edit/page as patrolled
1706          */
1707         function markpatrolled() {
1708                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1709                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1710
1711                 # If we haven't been given an rc_id value, we can't do anything
1712                 $rcid = (int) $wgRequest->getVal('rcid');
1713                 $rc = RecentChange::newFromId($rcid);
1714                 if ( is_null($rc) ) {
1715                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1716                         return;
1717                 }
1718
1719                 #It would be nice to see where the user had actually come from, but for now just guess
1720                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1721                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1722
1723                 $dbw = wfGetDB( DB_MASTER );
1724                 $errors = $rc->doMarkPatrolled();
1725
1726                 if ( in_array(array('rcpatroldisabled'), $errors) ) {
1727                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1728                         return;
1729                 }
1730
1731                 if ( in_array(array('hookaborted'), $errors) ) {
1732                         // The hook itself has handled any output
1733                         return;
1734                 }
1735
1736                 if ( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1737                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1738                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1739                         $wgOut->returnToMain( false, $return );
1740                         return;
1741                 }
1742
1743                 if ( !empty($errors) ) {
1744                         $wgOut->showPermissionsErrorPage( $errors );
1745                         return;
1746                 }
1747
1748                 # Inform the user
1749                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1750                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1751                 $wgOut->returnToMain( false, $return );
1752         }
1753
1754         /**
1755          * User-interface handler for the "watch" action
1756          */
1757
1758         function watch() {
1759
1760                 global $wgUser, $wgOut;
1761
1762                 if ( $wgUser->isAnon() ) {
1763                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1764                         return;
1765                 }
1766                 if ( wfReadOnly() ) {
1767                         $wgOut->readOnlyPage();
1768                         return;
1769                 }
1770
1771                 if( $this->doWatch() ) {
1772                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1773                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1774
1775                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1776                 }
1777
1778                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1779         }
1780
1781         /**
1782          * Add this page to $wgUser's watchlist
1783          * @return bool true on successful watch operation
1784          */
1785         function doWatch() {
1786                 global $wgUser;
1787                 if( $wgUser->isAnon() ) {
1788                         return false;
1789                 }
1790
1791                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1792                         $wgUser->addWatch( $this->mTitle );
1793
1794                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1795                 }
1796
1797                 return false;
1798         }
1799
1800         /**
1801          * User interface handler for the "unwatch" action.
1802          */
1803         function unwatch() {
1804
1805                 global $wgUser, $wgOut;
1806
1807                 if ( $wgUser->isAnon() ) {
1808                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1809                         return;
1810                 }
1811                 if ( wfReadOnly() ) {
1812                         $wgOut->readOnlyPage();
1813                         return;
1814                 }
1815
1816                 if( $this->doUnwatch() ) {
1817                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1818                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1819
1820                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1821                 }
1822
1823                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1824         }
1825
1826         /**
1827          * Stop watching a page
1828          * @return bool true on successful unwatch
1829          */
1830         function doUnwatch() {
1831                 global $wgUser;
1832                 if( $wgUser->isAnon() ) {
1833                         return false;
1834                 }
1835
1836                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1837                         $wgUser->removeWatch( $this->mTitle );
1838
1839                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1840                 }
1841
1842                 return false;
1843         }
1844
1845         /**
1846          * action=protect handler
1847          */
1848         function protect() {
1849                 $form = new ProtectionForm( $this );
1850                 $form->execute();
1851         }
1852
1853         /**
1854          * action=unprotect handler (alias)
1855          */
1856         function unprotect() {
1857                 $this->protect();
1858         }
1859
1860         /**
1861          * Update the article's restriction field, and leave a log entry.
1862          *
1863          * @param array $limit set of restriction keys
1864          * @param string $reason
1865          * @return bool true on success
1866          */
1867         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = array() ) {
1868                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1869
1870                 $id = $this->mTitle->getArticleID();
1871                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1872                         return false;
1873                 }
1874
1875                 if( !$cascade ) {
1876                         $cascade = false;
1877                 }
1878
1879                 // Take this opportunity to purge out expired restrictions
1880                 Title::purgeExpiredRestrictions();
1881
1882                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1883                 # we expect a single selection, but the schema allows otherwise.
1884                 $current = array();
1885                 $updated = Article::flattenRestrictions( $limit );
1886                 $changed = false;
1887                 foreach( $wgRestrictionTypes as $action ) {
1888                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1889                         $changed = ($changed || ($this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action]) );
1890                 }
1891
1892                 $current = Article::flattenRestrictions( $current );
1893
1894                 $changed = ($changed || ( $current != $updated ) );
1895                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1896                 $protect = ( $updated != '' );
1897
1898                 # If nothing's changed, do nothing
1899                 if( $changed ) {
1900                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1901
1902                                 $dbw = wfGetDB( DB_MASTER );
1903
1904                                 # Prepare a null revision to be added to the history
1905                                 $modified = $current != '' && $protect;
1906                                 if( $protect ) {
1907                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1908                                 } else {
1909                                         $comment_type = 'unprotectedarticle';
1910                                 }
1911                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1912
1913                                 # Only restrictions with the 'protect' right can cascade...
1914                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1915                                 foreach( $limit as $action => $restriction ) {
1916                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1917                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1918                                                 $cascade = false;
1919                                                 break;
1920                                         }
1921                                 }
1922                                 $cascade_description = '';
1923                                 if( $cascade ) {
1924                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1925                                 }
1926
1927                                 if( $reason )
1928                                         $comment .= ": $reason";
1929
1930                                 $editComment = $comment;
1931                                 $encodedExpiry = array();
1932                                 $protect_description = '';
1933                                 foreach( $limit as $action => $restrictions  ) {
1934                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1935                                         if( $restrictions != '' ) {
1936                                                 $protect_description .= "[$action=$restrictions] (";
1937                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1938                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1939                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1940                                                 } else {
1941                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1942                                                 }
1943                                                 $protect_description .= ') ';
1944                                         }
1945                                 }
1946                                 $protect_description = trim($protect_description);
1947
1948                                 if( $protect_description && $protect )
1949                                         $editComment .= " ($protect_description)";
1950                                 if( $cascade )
1951                                         $editComment .= "$cascade_description";
1952                                 # Update restrictions table
1953                                 foreach( $limit as $action => $restrictions ) {
1954                                         if ($restrictions != '' ) {
1955                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1956                                                         array( 'pr_page' => $id,
1957                                                                 'pr_type' => $action,
1958                                                                 'pr_level' => $restrictions,
1959                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1960                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1961                                         } else {
1962                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1963                                                         'pr_type' => $action ), __METHOD__ );
1964                                         }
1965                                 }
1966
1967                                 # Insert a null revision
1968                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1969                                 $nullRevId = $nullRevision->insertOn( $dbw );
1970
1971                                 $latest = $this->getLatest();
1972                                 # Update page record
1973                                 $dbw->update( 'page',
1974                                         array( /* SET */
1975                                                 'page_touched' => $dbw->timestamp(),
1976                                                 'page_restrictions' => '',
1977                                                 'page_latest' => $nullRevId
1978                                         ), array( /* WHERE */
1979                                                 'page_id' => $id
1980                                         ), 'Article::protect'
1981                                 );
1982
1983                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest) );
1984                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1985
1986                                 # Update the protection log
1987                                 $log = new LogPage( 'protect' );
1988                                 if( $protect ) {
1989                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1990                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1991                                 } else {
1992                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1993                                 }
1994
1995                         } # End hook
1996                 } # End "changed" check
1997
1998                 return true;
1999         }
2000
2001         /**
2002          * Take an array of page restrictions and flatten it to a string
2003          * suitable for insertion into the page_restrictions field.
2004          * @param array $limit
2005          * @return string
2006          * @private
2007          */
2008         function flattenRestrictions( $limit ) {
2009                 if( !is_array( $limit ) ) {
2010                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2011                 }
2012                 $bits = array();
2013                 ksort( $limit );
2014                 foreach( $limit as $action => $restrictions ) {
2015                         if( $restrictions != '' ) {
2016                                 $bits[] = "$action=$restrictions";
2017                         }
2018                 }
2019                 return implode( ':', $bits );
2020         }
2021
2022         /**
2023          * Auto-generates a deletion reason
2024          * @param bool &$hasHistory Whether the page has a history
2025          */
2026         public function generateReason( &$hasHistory ) {
2027                 global $wgContLang;
2028                 $dbw = wfGetDB( DB_MASTER );
2029                 // Get the last revision
2030                 $rev = Revision::newFromTitle( $this->mTitle );
2031                 if( is_null( $rev ) )
2032                         return false;
2033
2034                 // Get the article's contents
2035                 $contents = $rev->getText();
2036                 $blank = false;
2037                 // If the page is blank, use the text from the previous revision,
2038                 // which can only be blank if there's a move/import/protect dummy revision involved
2039                 if( $contents == '' ) {
2040                         $prev = $rev->getPrevious();
2041                         if( $prev )     {
2042                                 $contents = $prev->getText();
2043                                 $blank = true;
2044                         }
2045                 }
2046
2047                 // Find out if there was only one contributor
2048                 // Only scan the last 20 revisions
2049                 $limit = 20;
2050                 $res = $dbw->select( 'revision', 'rev_user_text',
2051                         array( 'rev_page' => $this->getID() ), __METHOD__,
2052                         array( 'LIMIT' => $limit )
2053                 );
2054                 if( $res === false )
2055                         // This page has no revisions, which is very weird
2056                         return false;
2057                 if( $res->numRows() > 1 )
2058                                 $hasHistory = true;
2059                 else
2060                                 $hasHistory = false;
2061                 $row = $dbw->fetchObject( $res );
2062                 $onlyAuthor = $row->rev_user_text;
2063                 // Try to find a second contributor
2064                 foreach( $res as $row ) {
2065                         if( $row->rev_user_text != $onlyAuthor ) {
2066                                 $onlyAuthor = false;
2067                                 break;
2068                         }
2069                 }
2070                 $dbw->freeResult( $res );
2071
2072                 // Generate the summary with a '$1' placeholder
2073                 if( $blank ) {
2074                         // The current revision is blank and the one before is also
2075                         // blank. It's just not our lucky day
2076                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2077                 } else {
2078                         if( $onlyAuthor )
2079                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2080                         else
2081                                 $reason = wfMsgForContent( 'excontent', '$1' );
2082                 }
2083
2084                 // Replace newlines with spaces to prevent uglyness
2085                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2086                 // Calculate the maximum amount of chars to get
2087                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2088                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2089                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2090                 // Remove possible unfinished links
2091                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2092                 // Now replace the '$1' placeholder
2093                 $reason = str_replace( '$1', $contents, $reason );
2094                 return $reason;
2095         }
2096
2097
2098         /*
2099          * UI entry point for page deletion
2100          */
2101         function delete() {
2102                 global $wgUser, $wgOut, $wgRequest;
2103
2104                 $confirm = $wgRequest->wasPosted() &&
2105                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2106
2107                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2108                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2109
2110                 $reason = $this->DeleteReasonList;
2111
2112                 if ( $reason != 'other' && $this->DeleteReason != '') {
2113                         // Entry from drop down menu + additional comment
2114                         $reason .= ': ' . $this->DeleteReason;
2115                 } elseif ( $reason == 'other' ) {
2116                         $reason = $this->DeleteReason;
2117                 }
2118                 # Flag to hide all contents of the archived revisions
2119                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2120
2121                 # This code desperately needs to be totally rewritten
2122
2123                 # Read-only check...
2124                 if ( wfReadOnly() ) {
2125                         $wgOut->readOnlyPage();
2126                         return;
2127                 }
2128
2129                 # Check permissions
2130                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2131
2132                 if (count($permission_errors)>0) {
2133                         $wgOut->showPermissionsErrorPage( $permission_errors );
2134                         return;
2135                 }
2136
2137                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2138
2139                 # Better double-check that it hasn't been deleted yet!
2140                 $dbw = wfGetDB( DB_MASTER );
2141                 $conds = $this->mTitle->pageCond();
2142                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2143                 if ( $latest === false ) {
2144                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2145                         return;
2146                 }
2147
2148                 # Hack for big sites
2149                 $bigHistory = $this->isBigDeletion();
2150                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2151                         global $wgLang, $wgDeleteRevisionsLimit;
2152                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2153                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2154                         return;
2155                 }
2156
2157                 if( $confirm ) {
2158                         $this->doDelete( $reason, $suppress );
2159                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2160                                 $this->doWatch();
2161                         } elseif( $this->mTitle->userIsWatching() ) {
2162                                 $this->doUnwatch();
2163                         }
2164                         return;
2165                 }
2166
2167                 // Generate deletion reason
2168                 $hasHistory = false;
2169                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2170
2171                 // If the page has a history, insert a warning
2172                 if( $hasHistory && !$confirm ) {
2173                         $skin=$wgUser->getSkin();
2174                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2175                         if( $bigHistory ) {
2176                                 global $wgLang, $wgDeleteRevisionsLimit;
2177                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2178                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2179                         }
2180                 }
2181
2182                 return $this->confirmDelete( $reason );
2183         }
2184
2185         /**
2186          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2187          */
2188         function isBigDeletion() {
2189                 global $wgDeleteRevisionsLimit;
2190                 if( $wgDeleteRevisionsLimit ) {
2191                         $revCount = $this->estimateRevisionCount();
2192                         return $revCount > $wgDeleteRevisionsLimit;
2193                 }
2194                 return false;
2195         }
2196
2197         /**
2198          * @return int approximate revision count
2199          */
2200         function estimateRevisionCount() {
2201                 $dbr = wfGetDB( DB_SLAVE );
2202                 // For an exact count...
2203                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2204                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2205                 return $dbr->estimateRowCount( 'revision', '*',
2206                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2207         }
2208
2209         /**
2210          * Get the last N authors
2211          * @param int $num Number of revisions to get
2212          * @param string $revLatest The latest rev_id, selected from the master (optional)
2213          * @return array Array of authors, duplicates not removed
2214          */
2215         function getLastNAuthors( $num, $revLatest = 0 ) {
2216                 wfProfileIn( __METHOD__ );
2217
2218                 // First try the slave
2219                 // If that doesn't have the latest revision, try the master
2220                 $continue = 2;
2221                 $db = wfGetDB( DB_SLAVE );
2222                 do {
2223                         $res = $db->select( array( 'page', 'revision' ),
2224                                 array( 'rev_id', 'rev_user_text' ),
2225                                 array(
2226                                         'page_namespace' => $this->mTitle->getNamespace(),
2227                                         'page_title' => $this->mTitle->getDBkey(),
2228                                         'rev_page = page_id'
2229                                 ), __METHOD__, $this->getSelectOptions( array(
2230                                         'ORDER BY' => 'rev_timestamp DESC',
2231                                         'LIMIT' => $num
2232                                 ) )
2233                         );
2234                         if ( !$res ) {
2235                                 wfProfileOut( __METHOD__ );
2236                                 return array();
2237                         }
2238                         $row = $db->fetchObject( $res );
2239                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2240                                 $db = wfGetDB( DB_MASTER );
2241                                 $continue--;
2242                         } else {
2243                                 $continue = 0;
2244                         }
2245                 } while ( $continue );
2246
2247                 $authors = array( $row->rev_user_text );
2248                 while ( $row = $db->fetchObject( $res ) ) {
2249                         $authors[] = $row->rev_user_text;
2250                 }
2251                 wfProfileOut( __METHOD__ );
2252                 return $authors;
2253         }
2254
2255         /**
2256          * Output deletion confirmation dialog
2257          * @param $reason string Prefilled reason
2258          */
2259         function confirmDelete( $reason ) {
2260                 global $wgOut, $wgUser;
2261
2262                 wfDebug( "Article::confirmDelete\n" );
2263
2264                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2265                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2266                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2267
2268                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2269                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2270                                         <td></td>
2271                                         <td class='mw-input'>" .
2272                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2273                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2274                                         "</td>
2275                                 </tr>";
2276                 } else {
2277                         $suppress = '';
2278                 }
2279                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2280
2281                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2282                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2283                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2284                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2285                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2286                         "<tr id=\"wpDeleteReasonListRow\">
2287                                 <td class='mw-label'>" .
2288                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2289                                 "</td>
2290                                 <td class='mw-input'>" .
2291                                         Xml::listDropDown( 'wpDeleteReasonList',
2292                                                 wfMsgForContent( 'deletereason-dropdown' ),
2293                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2294                                 "</td>
2295                         </tr>
2296                         <tr id=\"wpDeleteReasonRow\">
2297                                 <td class='mw-label'>" .
2298                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2299                                 "</td>
2300                                 <td class='mw-input'>" .
2301                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2302                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2303                                 "</td>
2304                         </tr>
2305                         <tr>
2306                                 <td></td>
2307                                 <td class='mw-input'>" .
2308                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2309                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2310                                 "</td>
2311                         </tr>
2312                         $suppress
2313                         <tr>
2314                                 <td></td>
2315                                 <td class='mw-submit'>" .
2316                                         Xml::submitButton( wfMsg( 'deletepage' ),
2317                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2318                                 "</td>
2319                         </tr>" .
2320                         Xml::closeElement( 'table' ) .
2321                         Xml::closeElement( 'fieldset' ) .
2322                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2323                         Xml::closeElement( 'form' );
2324
2325                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2326                                 $skin = $wgUser->getSkin();
2327                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2328                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2329                         }
2330
2331                 $wgOut->addHTML( $form );
2332                 $this->showLogExtract( $wgOut );
2333         }
2334
2335
2336         /**
2337          * Show relevant lines from the deletion log
2338          */
2339         function showLogExtract( $out ) {
2340                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2341                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2342         }
2343
2344
2345         /**
2346          * Perform a deletion and output success or failure messages
2347          */
2348         function doDelete( $reason, $suppress = false ) {
2349                 global $wgOut, $wgUser;
2350                 wfDebug( __METHOD__."\n" );
2351
2352                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2353
2354                 $error = '';
2355
2356                 if ( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2357                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2358                                 $deleted = $this->mTitle->getPrefixedText();
2359
2360                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2361                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2362
2363                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2364
2365                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2366                                 $wgOut->returnToMain( false );
2367                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2368                         } else {
2369                                 if ($error = '')
2370                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2371                                 else
2372                                         $wgOut->showFatalError( $error );
2373                         }
2374                 }
2375         }
2376
2377         /**
2378          * Back-end article deletion
2379          * Deletes the article with database consistency, writes logs, purges caches
2380          * Returns success
2381          */
2382         function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2383                 global $wgUseSquid, $wgDeferredUpdateList;
2384                 global $wgUseTrackbacks;
2385
2386                 wfDebug( __METHOD__."\n" );
2387
2388                 $dbw = wfGetDB( DB_MASTER );
2389                 $ns = $this->mTitle->getNamespace();
2390                 $t = $this->mTitle->getDBkey();
2391                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2392
2393                 if ( $t == '' || $id == 0 ) {
2394                         return false;
2395                 }
2396
2397                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2398                 array_push( $wgDeferredUpdateList, $u );
2399
2400                 // Bitfields to further suppress the content
2401                 if ( $suppress ) {
2402                         $bitfield = 0;
2403                         // This should be 15...
2404                         $bitfield |= Revision::DELETED_TEXT;
2405                         $bitfield |= Revision::DELETED_COMMENT;
2406                         $bitfield |= Revision::DELETED_USER;
2407                         $bitfield |= Revision::DELETED_RESTRICTED;
2408                 } else {
2409                         $bitfield = 'rev_deleted';
2410                 }
2411
2412                 $dbw->begin();
2413                 // For now, shunt the revision data into the archive table.
2414                 // Text is *not* removed from the text table; bulk storage
2415                 // is left intact to avoid breaking block-compression or
2416                 // immutable storage schemes.
2417                 //
2418                 // For backwards compatibility, note that some older archive
2419                 // table entries will have ar_text and ar_flags fields still.
2420                 //
2421                 // In the future, we may keep revisions and mark them with
2422                 // the rev_deleted field, which is reserved for this purpose.
2423                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2424                         array(
2425                                 'ar_namespace'  => 'page_namespace',
2426                                 'ar_title'      => 'page_title',
2427                                 'ar_comment'    => 'rev_comment',
2428                                 'ar_user'       => 'rev_user',
2429                                 'ar_user_text'  => 'rev_user_text',
2430                                 'ar_timestamp'  => 'rev_timestamp',
2431                                 'ar_minor_edit' => 'rev_minor_edit',
2432                                 'ar_rev_id'     => 'rev_id',
2433                                 'ar_text_id'    => 'rev_text_id',
2434                                 'ar_text'       => '\'\'', // Be explicit to appease
2435                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2436                                 'ar_len'        => 'rev_len',
2437                                 'ar_page_id'    => 'page_id',
2438                                 'ar_deleted'    => $bitfield
2439                         ), array(
2440                                 'page_id' => $id,
2441                                 'page_id = rev_page'
2442                         ), __METHOD__
2443                 );
2444
2445                 # Delete restrictions for it
2446                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2447
2448                 # Now that it's safely backed up, delete it
2449                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2450                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2451                 if( !$ok ) {
2452                         $dbw->rollback();
2453                         return false;
2454                 }
2455
2456                 # If using cascading deletes, we can skip some explicit deletes
2457                 if ( !$dbw->cascadingDeletes() ) {
2458                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2459
2460                         if ($wgUseTrackbacks)
2461                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2462
2463                         # Delete outgoing links
2464                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2465                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2466                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2467                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2468                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2469                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2470                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2471                 }
2472
2473                 # If using cleanup triggers, we can skip some manual deletes
2474                 if ( !$dbw->cleanupTriggers() ) {
2475                         # Clean up recentchanges entries...
2476                         $dbw->delete( 'recentchanges',
2477                                 array( 'rc_type != '.RC_LOG,
2478                                         'rc_namespace' => $this->mTitle->getNamespace(),
2479                                         'rc_title' => $this->mTitle->getDBKey() ),
2480                                 __METHOD__ );
2481                         $dbw->delete( 'recentchanges',
2482                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2483                                 __METHOD__ );
2484                 }
2485
2486                 # Clear caches
2487                 Article::onArticleDelete( $this->mTitle );
2488
2489                 # Fix category table counts
2490                 $cats = array();
2491                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2492                 foreach( $res as $row ) {
2493                         $cats []= $row->cl_to;
2494                 }
2495                 $this->updateCategoryCounts( array(), $cats );
2496
2497                 # Clear the cached article id so the interface doesn't act like we exist
2498                 $this->mTitle->resetArticleID( 0 );
2499                 $this->mTitle->mArticleID = 0;
2500
2501                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2502                 $logtype = $suppress ? 'suppress' : 'delete';
2503                 $log = new LogPage( $logtype );
2504
2505                 # Make sure logging got through
2506                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2507
2508                 $dbw->commit();
2509
2510                 return true;
2511         }
2512
2513         /**
2514          * Roll back the most recent consecutive set of edits to a page
2515          * from the same user; fails if there are no eligible edits to
2516          * roll back to, e.g. user is the sole contributor. This function
2517          * performs permissions checks on $wgUser, then calls commitRollback()
2518          * to do the dirty work
2519          *
2520          * @param string $fromP - Name of the user whose edits to rollback.
2521          * @param string $summary - Custom summary. Set to default summary if empty.
2522          * @param string $token - Rollback token.
2523          * @param bool   $bot - If true, mark all reverted edits as bot.
2524          *
2525          * @param array $resultDetails contains result-specific array of additional values
2526          *    'alreadyrolled' : 'current' (rev)
2527          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2528          *
2529          * @return array of errors, each error formatted as
2530          *   array(messagekey, param1, param2, ...).
2531          * On success, the array is empty.  This array can also be passed to
2532          * OutputPage::showPermissionsErrorPage().
2533          */
2534         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2535                 global $wgUser;
2536                 $resultDetails = null;
2537
2538                 # Check permissions
2539                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2540                         $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2541                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2542                         $errors[] = array( 'sessionfailure' );
2543
2544                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2545                         $errors[] = array( 'actionthrottledtext' );
2546                 }
2547                 # If there were errors, bail out now
2548                 if(!empty($errors))
2549                         return $errors;
2550
2551                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2552         }
2553
2554         /**
2555          * Backend implementation of doRollback(), please refer there for parameter
2556          * and return value documentation
2557          *
2558          * NOTE: This function does NOT check ANY permissions, it just commits the
2559          * rollback to the DB Therefore, you should only call this function direct-
2560          * ly if you want to use custom permissions checks. If you don't, use
2561          * doRollback() instead.
2562          */
2563         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2564                 global $wgUseRCPatrol, $wgUser, $wgLang;
2565                 $dbw = wfGetDB( DB_MASTER );
2566
2567                 if( wfReadOnly() ) {
2568                         return array( array( 'readonlytext' ) );
2569                 }
2570
2571                 # Get the last editor
2572                 $current = Revision::newFromTitle( $this->mTitle );
2573                 if( is_null( $current ) ) {
2574                         # Something wrong... no page?
2575                         return array(array('notanarticle'));
2576                 }
2577
2578                 $from = str_replace( '_', ' ', $fromP );
2579                 if( $from != $current->getUserText() ) {
2580                         $resultDetails = array( 'current' => $current );
2581                         return array(array('alreadyrolled',
2582                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2583                                 htmlspecialchars($fromP),
2584                                 htmlspecialchars($current->getUserText())
2585                         ));
2586                 }
2587
2588                 # Get the last edit not by this guy
2589                 $user = intval( $current->getUser() );
2590                 $user_text = $dbw->addQuotes( $current->getUserText() );
2591                 $s = $dbw->selectRow( 'revision',
2592                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2593                         array(  'rev_page' => $current->getPage(),
2594                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2595                         ), __METHOD__,
2596                         array(  'USE INDEX' => 'page_timestamp',
2597                                 'ORDER BY'  => 'rev_timestamp DESC' )
2598                         );
2599                 if( $s === false ) {
2600                         # No one else ever edited this page
2601                         return array(array('cantrollback'));
2602                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2603                         # Only admins can see this text
2604                         return array(array('notvisiblerev'));
2605                 }
2606
2607                 $set = array();
2608                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2609                         # Mark all reverted edits as bot
2610                         $set['rc_bot'] = 1;
2611                 }
2612                 if ( $wgUseRCPatrol ) {
2613                         # Mark all reverted edits as patrolled
2614                         $set['rc_patrolled'] = 1;
2615                 }
2616
2617                 if ( $set ) {
2618                         $dbw->update( 'recentchanges', $set,
2619                                         array( /* WHERE */
2620                                                 'rc_cur_id' => $current->getPage(),
2621                                                 'rc_user_text' => $current->getUserText(),
2622                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2623                                         ), __METHOD__
2624                                 );
2625                 }
2626
2627                 # Generate the edit summary if necessary
2628                 $target = Revision::newFromId( $s->rev_id );
2629                 if( empty( $summary ) ){
2630                         $summary = wfMsgForContent( 'revertpage' );
2631                 }
2632
2633                 # Allow the custom summary to use the same args as the default message
2634                 $args = array(
2635                         $target->getUserText(), $from, $s->rev_id,
2636                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2637                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2638                 );
2639                 $summary = wfMsgReplaceArgs( $summary, $args );
2640
2641                 # Save
2642                 $flags = EDIT_UPDATE;
2643
2644                 if( $wgUser->isAllowed('minoredit') )
2645                         $flags |= EDIT_MINOR;
2646
2647                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2648                         $flags |= EDIT_FORCE_BOT;
2649                 # Actually store the edit
2650                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2651                 if ( !empty( $status->value['revision'] ) ) {
2652                         $revId = $status->value['revision']->getId();
2653                 } else {
2654                         $revId = false;
2655                 }
2656
2657                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2658
2659                 $resultDetails = array(
2660                         'summary' => $summary,
2661                         'current' => $current,
2662                         'target' => $target,
2663                         'newid' => $revId
2664                 );
2665                 return array();
2666         }
2667
2668         /**
2669          * User interface for rollback operations
2670          */
2671         function rollback() {
2672                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2673                 $details = null;
2674
2675                 $result = $this->doRollback(
2676                         $wgRequest->getVal( 'from' ),
2677                         $wgRequest->getText( 'summary' ),
2678                         $wgRequest->getVal( 'token' ),
2679                         $wgRequest->getBool( 'bot' ),
2680                         $details
2681                 );
2682
2683                 if( in_array( array( 'blocked' ), $result ) ) {
2684                         $wgOut->blockedPage();
2685                         return;
2686                 }
2687                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2688                         $wgOut->rateLimited();
2689                         return;
2690                 }
2691                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2692                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2693                         $errArray = $result[0];
2694                         $errMsg = array_shift( $errArray );
2695                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2696                         if( isset( $details['current'] ) ){
2697                                 $current = $details['current'];
2698                                 if( $current->getComment() != '' ) {
2699                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2700                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2701                                 }
2702                         }
2703                         return;
2704                 }
2705                 # Display permissions errors before read-only message -- there's no
2706                 # point in misleading the user into thinking the inability to rollback
2707                 # is only temporary.
2708                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2709                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2710                         # move any 'readonlytext' error manually.
2711                         $out = array();
2712                         foreach( $result as $error ) {
2713                                 if( $error != array( 'readonlytext' ) ) {
2714                                         $out []= $error;
2715                                 }
2716                         }
2717                         $wgOut->showPermissionsErrorPage( $out );
2718                         return;
2719                 }
2720                 if( $result == array( array('readonlytext') ) ) {
2721                         $wgOut->readOnlyPage();
2722                         return;
2723                 }
2724
2725                 $current = $details['current'];
2726                 $target = $details['target'];
2727                 $newId = $details['newid'];
2728                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2729                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2730                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2731                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2732                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2733                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2734                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2735                 $wgOut->returnToMain( false, $this->mTitle );
2736
2737                 if( !$wgRequest->getBool( 'hidediff', false ) ) {
2738                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2739                         $de->showDiff( '', '' );
2740                 }
2741         }
2742
2743
2744         /**
2745          * Do standard deferred updates after page view
2746          * @private
2747          */
2748         function viewUpdates() {
2749                 global $wgDeferredUpdateList, $wgUser;
2750
2751                 if ( 0 != $this->getID() ) {
2752                         # Don't update page view counters on views from bot users (bug 14044)
2753                         global $wgDisableCounters;
2754                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2755                                 Article::incViewCount( $this->getID() );
2756                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2757                                 array_push( $wgDeferredUpdateList, $u );
2758                         }
2759                 }
2760
2761                 # Update newtalk / watchlist notification status
2762                 $wgUser->clearNotification( $this->mTitle );
2763         }
2764
2765         /**
2766          * Prepare text which is about to be saved.
2767          * Returns a stdclass with source, pst and output members
2768          */
2769         function prepareTextForEdit( $text, $revid=null ) {
2770                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2771                         // Already prepared
2772                         return $this->mPreparedEdit;
2773                 }
2774                 global $wgParser;
2775                 $edit = (object)array();
2776                 $edit->revid = $revid;
2777                 $edit->newText = $text;
2778                 $edit->pst = $this->preSaveTransform( $text );
2779                 $options = new ParserOptions;
2780                 $options->setTidy( true );
2781                 $options->enableLimitReport();
2782                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2783                 $edit->oldText = $this->getContent();
2784                 $this->mPreparedEdit = $edit;
2785                 return $edit;
2786         }
2787
2788         /**
2789          * Do standard deferred updates after page edit.
2790          * Update links tables, site stats, search index and message cache.
2791          * Purges pages that include this page if the text was changed here.
2792          * Every 100th edit, prune the recent changes table.
2793          *
2794          * @private
2795          * @param $text New text of the article
2796          * @param $summary Edit summary
2797          * @param $minoredit Minor edit
2798          * @param $timestamp_of_pagechange Timestamp associated with the page change
2799          * @param $newid rev_id value of the new revision
2800          * @param $changed Whether or not the content actually changed
2801          */
2802         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2803                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2804
2805                 wfProfileIn( __METHOD__ );
2806
2807                 # Parse the text
2808                 # Be careful not to double-PST: $text is usually already PST-ed once
2809                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2810                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2811                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2812                 } else {
2813                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2814                         $editInfo = $this->mPreparedEdit;
2815                 }
2816
2817                 # Save it to the parser cache
2818                 if ( $wgEnableParserCache ) {
2819                         $parserCache = ParserCache::singleton();
2820                         $parserCache->save( $editInfo->output, $this, $wgUser );
2821                 }
2822
2823                 # Update the links tables
2824                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2825                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2826                 $u->doUpdate();
2827
2828                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2829
2830                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2831                         if ( 0 == mt_rand( 0, 99 ) ) {
2832                                 // Flush old entries from the `recentchanges` table; we do this on
2833                                 // random requests so as to avoid an increase in writes for no good reason
2834                                 global $wgRCMaxAge;
2835                                 $dbw = wfGetDB( DB_MASTER );
2836                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2837                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2838                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2839                                 $dbw->query( $sql );
2840                         }
2841                 }
2842
2843                 $id = $this->getID();
2844                 $title = $this->mTitle->getPrefixedDBkey();
2845                 $shortTitle = $this->mTitle->getDBkey();
2846
2847                 if ( 0 == $id ) {
2848                         wfProfileOut( __METHOD__ );
2849                         return;
2850                 }
2851
2852                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2853                 array_push( $wgDeferredUpdateList, $u );
2854                 $u = new SearchUpdate( $id, $title, $text );
2855                 array_push( $wgDeferredUpdateList, $u );
2856
2857                 # If this is another user's talk page, update newtalk
2858                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2859                 # load of user talk pages and piss people off, nor if it's a minor edit
2860                 # by a properly-flagged bot.
2861                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2862                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2863                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2864                                 $other = User::newFromName( $shortTitle, false );
2865                                 if ( !$other ) {
2866                                         wfDebug( __METHOD__.": invalid username\n" );
2867                                 } elseif( User::isIP( $shortTitle ) ) {
2868                                         // An anonymous user
2869                                         $other->setNewtalk( true );
2870                                 } elseif( $other->isLoggedIn() ) {
2871                                         $other->setNewtalk( true );
2872                                 } else {
2873                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2874                                 }
2875                         }
2876                 }
2877
2878                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2879                         $wgMessageCache->replace( $shortTitle, $text );
2880                 }
2881
2882                 wfProfileOut( __METHOD__ );
2883         }
2884
2885         /**
2886          * Perform article updates on a special page creation.
2887          *
2888          * @param Revision $rev
2889          *
2890          * @todo This is a shitty interface function. Kill it and replace the
2891          * other shitty functions like editUpdates and such so it's not needed
2892          * anymore.
2893          */
2894         function createUpdates( $rev ) {
2895                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2896                 $this->mTotalAdjustment = 1;
2897                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2898                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2899         }
2900
2901         /**
2902          * Generate the navigation links when browsing through an article revisions
2903          * It shows the information as:
2904          *   Revision as of \<date\>; view current revision
2905          *   \<- Previous version | Next Version -\>
2906          *
2907          * @private
2908          * @param string $oldid         Revision ID of this article revision
2909          */
2910         function setOldSubtitle( $oldid=0 ) {
2911                 global $wgLang, $wgOut, $wgUser;
2912
2913                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2914                                 return;
2915                 }
2916
2917                 $revision = Revision::newFromId( $oldid );
2918
2919                 $current = ( $oldid == $this->mLatest );
2920                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2921                 $sk = $wgUser->getSkin();
2922                 $lnk = $current
2923                         ? wfMsg( 'currentrevisionlink' )
2924                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2925                 $curdiff = $current
2926                         ? wfMsg( 'diff' )
2927                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2928                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2929                 $prevlink = $prev
2930                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2931                         : wfMsg( 'previousrevision' );
2932                 $prevdiff = $prev
2933                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2934                         : wfMsg( 'diff' );
2935                 $nextlink = $current
2936                         ? wfMsg( 'nextrevision' )
2937                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2938                 $nextdiff = $current
2939                         ? wfMsg( 'diff' )
2940                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2941
2942                 $cdel='';
2943                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2944                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2945                         if( $revision->isCurrent() ) {
2946                         // We don't handle top deleted edits too well
2947                                 $cdel = wfMsgHtml('rev-delundel');
2948                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2949                         // If revision was hidden from sysops
2950                                 $cdel = wfMsgHtml('rev-delundel');
2951                         } else {
2952                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2953                                         wfMsgHtml('rev-delundel'),
2954                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2955                                         '&oldid=' . urlencode( $oldid ) );
2956                                 // Bolden oversighted content
2957                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2958                                         $cdel = "<strong>$cdel</strong>";
2959                         }
2960                         $cdel = "(<small>$cdel</small>) ";
2961                 }
2962                 # Show user links if allowed to see them. Normally they
2963                 # are hidden regardless, but since we can already see the text here...
2964                 $userlinks = $sk->revUserTools( $revision, false );
2965
2966                 $m = wfMsg( 'revision-info-current' );
2967                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2968                         ? 'revision-info-current'
2969                         : 'revision-info';
2970
2971                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2972
2973                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff,
2974                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2975                 $wgOut->setSubtitle( $r );
2976         }
2977
2978         /**
2979          * This function is called right before saving the wikitext,
2980          * so we can do things like signatures and links-in-context.
2981          *
2982          * @param string $text
2983          */
2984         function preSaveTransform( $text ) {
2985                 global $wgParser, $wgUser;
2986                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2987         }
2988
2989         /* Caching functions */
2990
2991         /**
2992          * checkLastModified returns true if it has taken care of all
2993          * output to the client that is necessary for this request.
2994          * (that is, it has sent a cached version of the page)
2995          */
2996         function tryFileCache() {
2997                 static $called = false;
2998                 if( $called ) {
2999                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3000                         return false;
3001                 }
3002                 $called = true;
3003                 if( $this->isFileCacheable() ) {
3004                         $touched = $this->mTouched;
3005                         $cache = new HTMLFileCache( $this->mTitle );
3006                         if( $cache->isFileCacheGood( $touched ) ) {
3007                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3008                                 $cache->loadFromFileCache();
3009                                 return true;
3010                         } else {
3011                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3012                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3013                         }
3014                 } else {
3015                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3016                 }
3017                 return false;
3018         }
3019
3020         /**
3021          * Check if the page can be cached
3022          * @return bool
3023          */
3024         function isFileCacheable() {
3025                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
3026                 // Get all query values
3027                 $queryVals = $wgRequest->getValues();
3028                 foreach( $queryVals as $query => $val ) {
3029                         if( $query == 'title' || ($query == 'action' && $val == 'view') ) {
3030                                 // Normal page view in query form
3031                         } else {
3032                                 return false;
3033                         }
3034                 }
3035                 // Check for non-standard user language; this covers uselang,
3036                 // and extensions for auto-detecting user language.
3037                 $ulang = $wgLang->getCode();
3038                 $clang = $wgContLang->getCode();
3039
3040                 $cacheable = $wgUseFileCache
3041                         && (!$wgShowIPinHeader)
3042                         && ($this->getID() > 0)
3043                         && ($wgUser->isAnon())
3044                         && (!$wgUser->getNewtalk())
3045                         && (!$this->mRedirectedFrom)
3046                         && ($ulang === $clang);
3047                 // Extension may have reason to disable file caching on some pages.
3048                 if( $cacheable ) {
3049                         $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3050                 }
3051                 return $cacheable;
3052         }
3053
3054         /**
3055          * Loads page_touched and returns a value indicating if it should be used
3056          *
3057          */
3058         function checkTouched() {
3059                 if( !$this->mDataLoaded ) {
3060                         $this->loadPageData();
3061                 }
3062                 return !$this->mIsRedirect;
3063         }
3064
3065         /**
3066          * Get the page_touched field
3067          */
3068         function getTouched() {
3069                 # Ensure that page data has been loaded
3070                 if( !$this->mDataLoaded ) {
3071                         $this->loadPageData();
3072                 }
3073                 return $this->mTouched;
3074         }
3075
3076         /**
3077          * Get the page_latest field
3078          */
3079         function getLatest() {
3080                 if ( !$this->mDataLoaded ) {
3081                         $this->loadPageData();
3082                 }
3083                 return $this->mLatest;
3084         }
3085
3086         /**
3087          * Edit an article without doing all that other stuff
3088          * The article must already exist; link tables etc
3089          * are not updated, caches are not flushed.
3090          *
3091          * @param string $text text submitted
3092          * @param string $comment comment submitted
3093          * @param bool $minor whereas it's a minor modification
3094          */
3095         function quickEdit( $text, $comment = '', $minor = 0 ) {
3096                 wfProfileIn( __METHOD__ );
3097
3098                 $dbw = wfGetDB( DB_MASTER );
3099                 $revision = new Revision( array(
3100                         'page'       => $this->getId(),
3101                         'text'       => $text,
3102                         'comment'    => $comment,
3103                         'minor_edit' => $minor ? 1 : 0,
3104                         ) );
3105                 $revision->insertOn( $dbw );
3106                 $this->updateRevisionOn( $dbw, $revision );
3107
3108                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
3109
3110                 wfProfileOut( __METHOD__ );
3111         }
3112
3113         /**
3114          * Used to increment the view counter
3115          *
3116          * @static
3117          * @param integer $id article id
3118          */
3119         function incViewCount( $id ) {
3120                 $id = intval( $id );
3121                 global $wgHitcounterUpdateFreq, $wgDBtype;
3122
3123                 $dbw = wfGetDB( DB_MASTER );
3124                 $pageTable = $dbw->tableName( 'page' );
3125                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3126                 $acchitsTable = $dbw->tableName( 'acchits' );
3127
3128                 if( $wgHitcounterUpdateFreq <= 1 ) {
3129                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3130                         return;
3131                 }
3132
3133                 # Not important enough to warrant an error page in case of failure
3134                 $oldignore = $dbw->ignoreErrors( true );
3135
3136                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3137
3138                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3139                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3140                         # Most of the time (or on SQL errors), skip row count check
3141                         $dbw->ignoreErrors( $oldignore );
3142                         return;
3143                 }
3144
3145                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3146                 $row = $dbw->fetchObject( $res );
3147                 $rown = intval( $row->n );
3148                 if( $rown >= $wgHitcounterUpdateFreq ){
3149                         wfProfileIn( 'Article::incViewCount-collect' );
3150                         $old_user_abort = ignore_user_abort( true );
3151
3152                         if ($wgDBtype == 'mysql')
3153                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3154                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3155                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3156                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3157                                 'GROUP BY hc_id');
3158                         $dbw->query("DELETE FROM $hitcounterTable");
3159                         if ($wgDBtype == 'mysql') {
3160                                 $dbw->query('UNLOCK TABLES');
3161                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3162                                         'WHERE page_id = hc_id');
3163                         }
3164                         else {
3165                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3166                                         "FROM $acchitsTable WHERE page_id = hc_id");
3167                         }
3168                         $dbw->query("DROP TABLE $acchitsTable");
3169
3170                         ignore_user_abort( $old_user_abort );
3171                         wfProfileOut( 'Article::incViewCount-collect' );
3172                 }
3173                 $dbw->ignoreErrors( $oldignore );
3174         }
3175
3176         /**#@+
3177          * The onArticle*() functions are supposed to be a kind of hooks
3178          * which should be called whenever any of the specified actions
3179          * are done.
3180          *
3181          * This is a good place to put code to clear caches, for instance.
3182          *
3183          * This is called on page move and undelete, as well as edit
3184          * @static
3185          * @param $title_obj a title object
3186          */
3187
3188         public static function onArticleCreate( $title ) {
3189                 # Update existence markers on article/talk tabs...
3190                 if ( $title->isTalkPage() ) {
3191                         $other = $title->getSubjectPage();
3192                 } else {
3193                         $other = $title->getTalkPage();
3194                 }
3195                 $other->invalidateCache();
3196                 $other->purgeSquid();
3197
3198                 $title->touchLinks();
3199                 $title->purgeSquid();
3200                 $title->deleteTitleProtection();
3201         }
3202
3203         public static function onArticleDelete( $title ) {
3204                 global $wgUseFileCache, $wgMessageCache;
3205                 # Update existence markers on article/talk tabs...
3206                 if( $title->isTalkPage() ) {
3207                         $other = $title->getSubjectPage();
3208                 } else {
3209                         $other = $title->getTalkPage();
3210                 }
3211                 $other->invalidateCache();
3212                 $other->purgeSquid();
3213
3214                 $title->touchLinks();
3215                 $title->purgeSquid();
3216
3217                 # File cache
3218                 if ( $wgUseFileCache ) {
3219                         $cm = new HTMLFileCache( $title );
3220                         @unlink( $cm->fileCacheName() );
3221                 }
3222
3223                 # Messages
3224                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3225                         $wgMessageCache->replace( $title->getDBkey(), false );
3226                 }
3227                 # Images
3228                 if( $title->getNamespace() == NS_IMAGE ) {
3229                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3230                         $update->doUpdate();
3231                 }
3232                 # User talk pages
3233                 if( $title->getNamespace() == NS_USER_TALK ) {
3234                         $user = User::newFromName( $title->getText(), false );
3235                         $user->setNewtalk( false );
3236                 }
3237         }
3238
3239         /**
3240          * Purge caches on page update etc
3241          */
3242         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3243                 global $wgDeferredUpdateList, $wgUseFileCache;
3244
3245                 // Invalidate caches of articles which include this page
3246                 if( $transclusions !== 'skiptransclusions' )
3247                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3248
3249                 // Invalidate the caches of all pages which redirect here
3250                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3251
3252                 # Purge squid for this page only
3253                 $title->purgeSquid();
3254
3255                 # Clear file cache for this page only
3256                 if ( $wgUseFileCache ) {
3257                         $cm = new HTMLFileCache( $title );
3258                         @unlink( $cm->fileCacheName() );
3259                 }
3260         }
3261
3262         /**#@-*/
3263
3264         /**
3265          * Overriden by ImagePage class, only present here to avoid a fatal error
3266          * Called for ?action=revert
3267          */
3268         public function revert(){
3269                 global $wgOut;
3270                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3271         }
3272
3273         /**
3274          * Info about this page
3275          * Called for ?action=info when $wgAllowPageInfo is on.
3276          *
3277          * @public
3278          */
3279         function info() {
3280                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3281
3282                 if ( !$wgAllowPageInfo ) {
3283                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3284                         return;
3285                 }
3286
3287                 $page = $this->mTitle->getSubjectPage();
3288
3289                 $wgOut->setPagetitle( $page->getPrefixedText() );
3290                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3291                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3292
3293                 if( !$this->mTitle->exists() ) {
3294                         $wgOut->addHtml( '<div class="noarticletext">' );
3295                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3296                                 // This doesn't quite make sense; the user is asking for
3297                                 // information about the _page_, not the message... -- RC
3298                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3299                         } else {
3300                                 $msg = $wgUser->isLoggedIn()
3301                                         ? 'noarticletext'
3302                                         : 'noarticletextanon';
3303                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3304                         }
3305                         $wgOut->addHtml( '</div>' );
3306                 } else {
3307                         $dbr = wfGetDB( DB_SLAVE );
3308                         $wl_clause = array(
3309                                 'wl_title'     => $page->getDBkey(),
3310                                 'wl_namespace' => $page->getNamespace() );
3311                         $numwatchers = $dbr->selectField(
3312                                 'watchlist',
3313                                 'COUNT(*)',
3314                                 $wl_clause,
3315                                 __METHOD__,
3316                                 $this->getSelectOptions() );
3317
3318                         $pageInfo = $this->pageCountInfo( $page );
3319                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3320
3321                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3322                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3323                         if( $talkInfo ) {
3324                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3325                         }
3326                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3327                         if( $talkInfo ) {
3328                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3329                         }
3330                         $wgOut->addHTML( '</ul>' );
3331
3332                 }
3333         }
3334
3335         /**
3336          * Return the total number of edits and number of unique editors
3337          * on a given page. If page does not exist, returns false.
3338          *
3339          * @param Title $title
3340          * @return array
3341          * @private
3342          */
3343         function pageCountInfo( $title ) {
3344                 $id = $title->getArticleId();
3345                 if( $id == 0 ) {
3346                         return false;
3347                 }
3348
3349                 $dbr = wfGetDB( DB_SLAVE );
3350
3351                 $rev_clause = array( 'rev_page' => $id );
3352
3353                 $edits = $dbr->selectField(
3354                         'revision',
3355                         'COUNT(rev_page)',
3356                         $rev_clause,
3357                         __METHOD__,
3358                         $this->getSelectOptions() );
3359
3360                 $authors = $dbr->selectField(
3361                         'revision',
3362                         'COUNT(DISTINCT rev_user_text)',
3363                         $rev_clause,
3364                         __METHOD__,
3365                         $this->getSelectOptions() );
3366
3367                 return array( 'edits' => $edits, 'authors' => $authors );
3368         }
3369
3370         /**
3371          * Return a list of templates used by this article.
3372          * Uses the templatelinks table
3373          *
3374          * @return array Array of Title objects
3375          */
3376         public function getUsedTemplates() {
3377                 $result = array();
3378                 $id = $this->mTitle->getArticleID();
3379                 if( $id == 0 ) {
3380                         return array();
3381                 }
3382
3383                 $dbr = wfGetDB( DB_SLAVE );
3384                 $res = $dbr->select( array( 'templatelinks' ),
3385                         array( 'tl_namespace', 'tl_title' ),
3386                         array( 'tl_from' => $id ),
3387                         __METHOD__ );
3388                 if( false !== $res ) {
3389                         foreach( $res as $row ) {
3390                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3391                         }
3392                 }
3393                 $dbr->freeResult( $res );
3394                 return $result;
3395         }
3396
3397         /**
3398          * Returns a list of hidden categories this page is a member of.
3399          * Uses the page_props and categorylinks tables.
3400          *
3401          * @return array Array of Title objects
3402          */
3403         public function getHiddenCategories() {
3404                 $result = array();
3405                 $id = $this->mTitle->getArticleID();
3406                 if( $id == 0 ) {
3407                         return array();
3408                 }
3409
3410                 $dbr = wfGetDB( DB_SLAVE );
3411                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3412                         array( 'cl_to' ),
3413                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3414                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3415                         __METHOD__ );
3416                 if ( false !== $res ) {
3417                         foreach( $res as $row ) {
3418                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3419                         }
3420                 }
3421                 $dbr->freeResult( $res );
3422                 return $result;
3423         }
3424
3425         /**
3426         * Return an applicable autosummary if one exists for the given edit.
3427         * @param string $oldtext The previous text of the page.
3428         * @param string $newtext The submitted text of the page.
3429         * @param bitmask $flags A bitmask of flags submitted for the edit.
3430         * @return string An appropriate autosummary, or an empty string.
3431         */
3432         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3433                 # Decide what kind of autosummary is needed.
3434
3435                 # Redirect autosummaries
3436                 $rt = Title::newFromRedirect( $newtext );
3437                 if( is_object( $rt ) ) {
3438                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3439                 }
3440
3441                 # New page autosummaries
3442                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3443                         # If they're making a new article, give its text, truncated, in the summary.
3444                         global $wgContLang;
3445                         $truncatedtext = $wgContLang->truncate(
3446                                 str_replace("\n", ' ', $newtext),
3447                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3448                                 '...' );
3449                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3450                 }
3451
3452                 # Blanking autosummaries
3453                 if( $oldtext != '' && $newtext == '' ) {
3454                         return wfMsgForContent('autosumm-blank');
3455                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3456                         # Removing more than 90% of the article
3457                         global $wgContLang;
3458                         $truncatedtext = $wgContLang->truncate(
3459                                 $newtext,
3460                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3461                                 '...'
3462                         );
3463                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3464                 }
3465
3466                 # If we reach this point, there's no applicable autosummary for our case, so our
3467                 # autosummary is empty.
3468                 return '';
3469         }
3470
3471         /**
3472          * Add the primary page-view wikitext to the output buffer
3473          * Saves the text into the parser cache if possible.
3474          * Updates templatelinks if it is out of date.
3475          *
3476          * @param string  $text
3477          * @param bool    $cache
3478          */
3479         public function outputWikiText( $text, $cache = true ) {
3480                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3481
3482                 $popts = $wgOut->parserOptions();
3483                 $popts->setTidy(true);
3484                 $popts->enableLimitReport();
3485                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3486                         $popts, true, true, $this->getRevIdFetched() );
3487                 $popts->setTidy(false);
3488                 $popts->enableLimitReport( false );
3489                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3490                         $parserCache = ParserCache::singleton();
3491                         $parserCache->save( $parserOutput, $this, $wgUser );
3492                 }
3493                 // Make sure file cache is not used on uncacheable content.
3494                 // Output that has magic words in it can still use the parser cache
3495                 // (if enabled), though it will generally expire sooner.
3496                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3497                         $wgUseFileCache = false;
3498                 }
3499
3500                 if ( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3501                         // templatelinks table may have become out of sync,
3502                         // especially if using variable-based transclusions.
3503                         // For paranoia, check if things have changed and if
3504                         // so apply updates to the database. This will ensure
3505                         // that cascaded protections apply as soon as the changes
3506                         // are visible.
3507
3508                         # Get templates from templatelinks
3509                         $id = $this->mTitle->getArticleID();
3510
3511                         $tlTemplates = array();
3512
3513                         $dbr = wfGetDB( DB_SLAVE );
3514                         $res = $dbr->select( array( 'templatelinks' ),
3515                                 array( 'tl_namespace', 'tl_title' ),
3516                                 array( 'tl_from' => $id ),
3517                                 __METHOD__ );
3518
3519                         global $wgContLang;
3520
3521                         if ( false !== $res ) {
3522                                 foreach( $res as $row ) {
3523                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3524                                 }
3525                         }
3526
3527                         # Get templates from parser output.
3528                         $poTemplates_allns = $parserOutput->getTemplates();
3529
3530                         $poTemplates = array ();
3531                         foreach ( $poTemplates_allns as $ns_templates ) {
3532                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3533                         }
3534
3535                         # Get the diff
3536                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3537
3538                         if ( count( $templates_diff ) > 0 ) {
3539                                 # Whee, link updates time.
3540                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3541                                 $u->doUpdate();
3542                         }
3543                 }
3544
3545                 $wgOut->addParserOutput( $parserOutput );
3546         }
3547
3548         /**
3549          * Update all the appropriate counts in the category table, given that
3550          * we've added the categories $added and deleted the categories $deleted.
3551          *
3552          * @param $added array   The names of categories that were added
3553          * @param $deleted array The names of categories that were deleted
3554          * @return null
3555          */
3556         public function updateCategoryCounts( $added, $deleted ) {
3557                 $ns = $this->mTitle->getNamespace();
3558                 $dbw = wfGetDB( DB_MASTER );
3559
3560                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3561                 # exist, we might legitimately not create it, but it's simpler to just
3562                 # create it and then give it a negative value, since the value is bogus
3563                 # anyway.
3564                 #
3565                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3566                 $insertCats = array_merge( $added, $deleted );
3567                 if( !$insertCats ) {
3568                         # Okay, nothing to do
3569                         return;
3570                 }
3571                 $insertRows = array();
3572                 foreach( $insertCats as $cat ) {
3573                         $insertRows[] = array( 'cat_title' => $cat );
3574                 }
3575                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3576
3577                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3578                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3579                 if( $ns == NS_CATEGORY ) {
3580                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3581                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3582                 } elseif( $ns == NS_IMAGE ) {
3583                         $addFields[]    = 'cat_files = cat_files + 1';
3584                         $removeFields[] = 'cat_files = cat_files - 1';
3585                 }
3586
3587                 if ( $added ) {
3588                         $dbw->update(
3589                                 'category',
3590                                 $addFields,
3591                                 array( 'cat_title' => $added ),
3592                                 __METHOD__
3593                         );
3594                 }
3595                 if ( $deleted ) {
3596                         $dbw->update(
3597                                 'category',
3598                                 $removeFields,
3599                                 array( 'cat_title' => $deleted ),
3600                                 __METHOD__
3601                         );
3602                 }
3603         }
3604 }