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         public 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                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $res = $dbr->select( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID()),
  90                         __METHOD__
  91                 );
  92                 if( $row = $dbr->fetchObject($res) ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirect( $text );
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 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                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * This function returns the text of a section, specified by a number ($section).
 234          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 235          * the first section before any such heading (section 0).
 236          *
 237          * If a section contains subsections, these are also returned.
 238          *
 239          * @param $text String: text to look in
 240          * @param $section Integer: section number
 241          * @return string text of the requested section
 242          * @deprecated
 243          */
 244         public function getSection( $text, $section ) {
 245                 global $wgParser;
 246                 return $wgParser->getSection( $text, $section );
 247         }
 248
 249         /**
 250          * @return int The oldid of the article that is to be shown, 0 for the
 251          *             current revision
 252          */
 253         public function getOldID() {
 254                 if( is_null( $this->mOldId ) ) {
 255                         $this->mOldId = $this->getOldIDFromRequest();
 256                 }
 257                 return $this->mOldId;
 258         }
 259
 260         /**
 261          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 262          *
 263          * @return int The old id for the request
 264          */
 265         public function getOldIDFromRequest() {
 266                 global $wgRequest;
 267                 $this->mRedirectUrl = false;
 268                 $oldid = $wgRequest->getVal( 'oldid' );
 269                 if( isset( $oldid ) ) {
 270                         $oldid = intval( $oldid );
 271                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 272                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 273                                 if( $nextid  ) {
 274                                         $oldid = $nextid;
 275                                 } else {
 276                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 277                                 }
 278                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 279                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 280                                 if( $previd ) {
 281                                         $oldid = $previd;
 282                                 }
 283                         }
 284                 }
 285                 if( !$oldid ) {
 286                         $oldid = 0;
 287                 }
 288                 return $oldid;
 289         }
 290
 291         /**
 292          * Load the revision (including text) into this object
 293          */
 294         function loadContent() {
 295                 if( $this->mContentLoaded ) return;
 296                 wfProfileIn( __METHOD__ );
 297                 # Query variables :P
 298                 $oldid = $this->getOldID();
 299                 # Pre-fill content with error message so that if something
 300                 # fails we'll have something telling us what we intended.
 301                 $this->mOldId = $oldid;
 302                 $this->fetchContent( $oldid );
 303                 wfProfileOut( __METHOD__ );
 304         }
 305
 306
 307         /**
 308          * Fetch a page record with the given conditions
 309          * @param $dbr Database object
 310          * @param $conditions Array
 311          */
 312         protected function pageData( $dbr, $conditions ) {
 313                 $fields = array(
 314                                 'page_id',
 315                                 'page_namespace',
 316                                 'page_title',
 317                                 'page_restrictions',
 318                                 'page_counter',
 319                                 'page_is_redirect',
 320                                 'page_is_new',
 321                                 'page_random',
 322                                 'page_touched',
 323                                 'page_latest',
 324                                 'page_len',
 325                 );
 326                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 327                 $row = $dbr->selectRow(
 328                         'page',
 329                         $fields,
 330                         $conditions,
 331                         __METHOD__
 332                 );
 333                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 334                 return $row ;
 335         }
 336
 337         /**
 338          * @param $dbr Database object
 339          * @param $title Title object
 340          */
 341         public function pageDataFromTitle( $dbr, $title ) {
 342                 return $this->pageData( $dbr, array(
 343                         'page_namespace' => $title->getNamespace(),
 344                         'page_title'     => $title->getDBkey() ) );
 345         }
 346
 347         /**
 348          * @param $dbr Database
 349          * @param $id Integer
 350          */
 351         protected function pageDataFromId( $dbr, $id ) {
 352                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 353         }
 354
 355         /**
 356          * Set the general counter, title etc data loaded from
 357          * some source.
 358          *
 359          * @param $data Database row object or "fromdb"
 360          */
 361         public function loadPageData( $data = 'fromdb' ) {
 362                 if( $data === 'fromdb' ) {
 363                         $dbr = wfGetDB( DB_MASTER );
 364                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 365                 }
 366
 367                 $lc = LinkCache::singleton();
 368                 if( $data ) {
 369                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 370
 371                         $this->mTitle->mArticleID = $data->page_id;
 372
 373                         # Old-fashioned restrictions
 374                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 375
 376                         $this->mCounter     = $data->page_counter;
 377                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 378                         $this->mIsRedirect  = $data->page_is_redirect;
 379                         $this->mLatest      = $data->page_latest;
 380                 } else {
 381                         if( is_object( $this->mTitle ) ) {
 382                                 $lc->addBadLinkObj( $this->mTitle );
 383                         }
 384                         $this->mTitle->mArticleID = 0;
 385                 }
 386
 387                 $this->mDataLoaded  = true;
 388         }
 389
 390         /**
 391          * Get text of an article from database
 392          * Does *NOT* follow redirects.
 393          * @param $oldid Int: 0 for whatever the latest revision is
 394          * @return string
 395          */
 396         function fetchContent( $oldid = 0 ) {
 397                 if( $this->mContentLoaded ) {
 398                         return $this->mContent;
 399                 }
 400
 401                 $dbr = wfGetDB( DB_MASTER );
 402
 403                 # Pre-fill content with error message so that if something
 404                 # fails we'll have something telling us what we intended.
 405                 $t = $this->mTitle->getPrefixedText();
 406                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 407                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 408
 409                 if( $oldid ) {
 410                         $revision = Revision::newFromId( $oldid );
 411                         if( is_null( $revision ) ) {
 412                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 413                                 return false;
 414                         }
 415                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 416                         if( !$data ) {
 417                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 418                                 return false;
 419                         }
 420                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 421                         $this->loadPageData( $data );
 422                 } else {
 423                         if( !$this->mDataLoaded ) {
 424                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 425                                 if( !$data ) {
 426                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 427                                         return false;
 428                                 }
 429                                 $this->loadPageData( $data );
 430                         }
 431                         $revision = Revision::newFromId( $this->mLatest );
 432                         if( is_null( $revision ) ) {
 433                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 434                                 return false;
 435                         }
 436                 }
 437
 438                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 439                 // We should instead work with the Revision object when we need it...
 440                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 441
 442                 $this->mUser      = $revision->getUser();
 443                 $this->mUserText  = $revision->getUserText();
 444                 $this->mComment   = $revision->getComment();
 445                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 446
 447                 $this->mRevIdFetched = $revision->getId();
 448                 $this->mContentLoaded = true;
 449                 $this->mRevision =& $revision;
 450
 451                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 452
 453                 return $this->mContent;
 454         }
 455
 456         /**
 457          * Read/write accessor to select FOR UPDATE
 458          *
 459          * @param $x Mixed: FIXME
 460          */
 461         public function forUpdate( $x = NULL ) {
 462                 return wfSetVar( $this->mForUpdate, $x );
 463         }
 464
 465         /**
 466          * Get the database which should be used for reads
 467          *
 468          * @return Database
 469          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 470          */
 471         function getDB() {
 472                 wfDeprecated( __METHOD__ );
 473                 return wfGetDB( DB_MASTER );
 474         }
 475
 476         /**
 477          * Get options for all SELECT statements
 478          *
 479          * @param $options Array: an optional options array which'll be appended to
 480          *                       the default
 481          * @return Array: options
 482          */
 483         protected function getSelectOptions( $options = '' ) {
 484                 if( $this->mForUpdate ) {
 485                         if( is_array( $options ) ) {
 486                                 $options[] = 'FOR UPDATE';
 487                         } else {
 488                                 $options = 'FOR UPDATE';
 489                         }
 490                 }
 491                 return $options;
 492         }
 493
 494         /**
 495          * @return int Page ID
 496          */
 497         public function getID() {
 498                 if( $this->mTitle ) {
 499                         return $this->mTitle->getArticleID();
 500                 } else {
 501                         return 0;
 502                 }
 503         }
 504
 505         /**
 506          * @return bool Whether or not the page exists in the database
 507          */
 508         public function exists() {
 509                 return $this->getId() > 0;
 510         }
 511
 512         /**
 513          * Check if this page is something we're going to be showing
 514          * some sort of sensible content for. If we return false, page
 515          * views (plain action=view) will return an HTTP 404 response,
 516          * so spiders and robots can know they're following a bad link.
 517          *
 518          * @return bool
 519          */
 520         public function hasViewableContent() {
 521                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 522         }
 523
 524         /**
 525          * @return int The view count for the page
 526          */
 527         public function getCount() {
 528                 if( -1 == $this->mCounter ) {
 529                         $id = $this->getID();
 530                         if( $id == 0 ) {
 531                                 $this->mCounter = 0;
 532                         } else {
 533                                 $dbr = wfGetDB( DB_SLAVE );
 534                                 $this->mCounter = $dbr->selectField( 'page',
 535                                         'page_counter',
 536                                         array( 'page_id' => $id ),
 537                                         __METHOD__,
 538                                         $this->getSelectOptions()
 539                                 );
 540                         }
 541                 }
 542                 return $this->mCounter;
 543         }
 544
 545         /**
 546          * Determine whether a page  would be suitable for being counted as an
 547          * article in the site_stats table based on the title & its content
 548          *
 549          * @param $text String: text to analyze
 550          * @return bool
 551          */
 552         public function isCountable( $text ) {
 553                 global $wgUseCommaCount;
 554
 555                 $token = $wgUseCommaCount ? ',' : '[[';
 556                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 557         }
 558
 559         /**
 560          * Tests if the article text represents a redirect
 561          *
 562          * @param $text String: FIXME
 563          * @return bool
 564          */
 565         public function isRedirect( $text = false ) {
 566                 if( $text === false ) {
 567                         if( $this->mDataLoaded ) {
 568                                 return $this->mIsRedirect;
 569                         }
 570                         // Apparently loadPageData was never called
 571                         $this->loadContent();
 572                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 573                 } else {
 574                         $titleObj = Title::newFromRedirect( $text );
 575                 }
 576                 return $titleObj !== NULL;
 577         }
 578
 579         /**
 580          * Returns true if the currently-referenced revision is the current edit
 581          * to this page (and it exists).
 582          * @return bool
 583          */
 584         public function isCurrent() {
 585                 # If no oldid, this is the current version.
 586                 if( $this->getOldID() == 0 ) {
 587                         return true;
 588                 }
 589                 return $this->exists() && isset($this->mRevision) && $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          */
 596         protected function loadLastEdit() {
 597                 if( -1 != $this->mUser )
 598                         return;
 599
 600                 # New or non-existent articles have no user information
 601                 $id = $this->getID();
 602                 if( 0 == $id ) return;
 603
 604                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 605                 if( !is_null( $this->mLastRevision ) ) {
 606                         $this->mUser      = $this->mLastRevision->getUser();
 607                         $this->mUserText  = $this->mLastRevision->getUserText();
 608                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 609                         $this->mComment   = $this->mLastRevision->getComment();
 610                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 611                         $this->mRevIdFetched = $this->mLastRevision->getId();
 612                 }
 613         }
 614
 615         public function getTimestamp() {
 616                 // Check if the field has been filled by ParserCache::get()
 617                 if( !$this->mTimestamp ) {
 618                         $this->loadLastEdit();
 619                 }
 620                 return wfTimestamp(TS_MW, $this->mTimestamp);
 621         }
 622
 623         public function getUser() {
 624                 $this->loadLastEdit();
 625                 return $this->mUser;
 626         }
 627
 628         public function getUserText() {
 629                 $this->loadLastEdit();
 630                 return $this->mUserText;
 631         }
 632
 633         public function getComment() {
 634                 $this->loadLastEdit();
 635                 return $this->mComment;
 636         }
 637
 638         public function getMinorEdit() {
 639                 $this->loadLastEdit();
 640                 return $this->mMinorEdit;
 641         }
 642
 643         /* Use this to fetch the rev ID used on page views */
 644         public function getRevIdFetched() {
 645                 $this->loadLastEdit();
 646                 return $this->mRevIdFetched;
 647         }
 648
 649         /**
 650          * @param $limit Integer: default 0.
 651          * @param $offset Integer: default 0.
 652          */
 653         public function getContributors($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         public function view() {
 685                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 686                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 687                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 688                 global $wgDefaultRobotPolicy;
 689
 690                 wfProfileIn( __METHOD__ );
 691
 692                 # Get variables from query string
 693                 $oldid = $this->getOldID();
 694
 695                 # Try file cache
 696                 if( $oldid === 0 && $this->checkTouched() ) {
 697                         global $wgUseETag;
 698                         if( $wgUseETag ) {
 699                                 $parserCache = ParserCache::singleton();
 700                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 701                         }
 702                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 703                                 wfProfileOut( __METHOD__ );
 704                                 return;
 705                         } else if( $this->tryFileCache() ) {
 706                                 # tell wgOut that output is taken care of
 707                                 $wgOut->disable();
 708                                 $this->viewUpdates();
 709                                 wfProfileOut( __METHOD__ );
 710                                 return;
 711                         }
 712                 }
 713
 714                 $ns = $this->mTitle->getNamespace(); # shortcut
 715                 $sk = $wgUser->getSkin();
 716
 717                 # getOldID may want us to redirect somewhere else
 718                 if( $this->mRedirectUrl ) {
 719                         $wgOut->redirect( $this->mRedirectUrl );
 720                         wfProfileOut( __METHOD__ );
 721                         return;
 722                 }
 723
 724                 $diff = $wgRequest->getVal( 'diff' );
 725                 $rcid = $wgRequest->getVal( 'rcid' );
 726                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 727                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 728                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 729                 $return404 = false;
 730
 731                 $wgOut->setArticleFlag( true );
 732
 733                 # Discourage indexing of printable versions, but encourage following
 734                 if( $wgOut->isPrintable() ) {
 735                         $policy = 'noindex,follow';
 736                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 737                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 738                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 739                         # Honour customised robot policies for this namespace
 740                         $policy = $wgNamespaceRobotPolicies[$ns];
 741                 } else {
 742                         $policy = $wgDefaultRobotPolicy;
 743                 }
 744                 $wgOut->setRobotPolicy( $policy );
 745
 746                 # If we got diff and oldid in the query, we want to see a
 747                 # diff page instead of the article.
 748
 749                 if( !is_null( $diff ) ) {
 750                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 751
 752                         $diff = $wgRequest->getVal( 'diff' );
 753                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 754                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 755                         // DifferenceEngine directly fetched the revision:
 756                         $this->mRevIdFetched = $de->mNewid;
 757                         $de->showDiffPage( $diffOnly );
 758
 759                         // Needed to get the page's current revision
 760                         $this->loadPageData();
 761                         if( $diff == 0 || $diff == $this->mLatest ) {
 762                                 # Run view updates for current revision only
 763                                 $this->viewUpdates();
 764                         }
 765                         wfProfileOut( __METHOD__ );
 766                         return;
 767                 }
 768
 769                 # Should the parser cache be used?
 770                 $pcache = $this->useParserCache( $oldid );
 771                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 772                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 773                         wfIncrStats( 'pcache_miss_stub' );
 774                 }
 775
 776                 $wasRedirected = false;
 777                 if( isset( $this->mRedirectedFrom ) ) {
 778                         // This is an internally redirected page view.
 779                         // We'll need a backlink to the source page for navigation.
 780                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 781                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 782                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 783                                 $wgOut->setSubtitle( $s );
 784
 785                                 // Set the fragment if one was specified in the redirect
 786                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 787                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 788                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 789                                 }
 790                                 $wasRedirected = true;
 791                         }
 792                 } elseif( !empty( $rdfrom ) ) {
 793                         // This is an externally redirected view, from some other wiki.
 794                         // If it was reported from a trusted site, supply a backlink.
 795                         global $wgRedirectSources;
 796                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 797                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 798                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 799                                 $wgOut->setSubtitle( $s );
 800                                 $wasRedirected = true;
 801                         }
 802                 }
 803
 804                 $outputDone = false;
 805                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 806                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 807                         // Ensure that UI elements requiring revision ID have
 808                         // the correct version information.
 809                         $wgOut->setRevisionId( $this->mLatest );
 810                         $outputDone = true;
 811                 }
 812                 # Fetch content and check for errors
 813                 if( !$outputDone ) {
 814                         # If the article does not exist and was deleted, show the log
 815                         if( $this->getID() == 0 ) {
 816                                 $this->showDeletionLog();
 817                         }
 818                         $text = $this->getContent();
 819                         if( $text === false ) {
 820                                 # Failed to load, replace text with error message
 821                                 $t = $this->mTitle->getPrefixedText();
 822                                 if( $oldid ) {
 823                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 824                                         $text = wfMsg( 'missing-article', $t, $d );
 825                                 } else {
 826                                         $text = wfMsg( 'noarticletext' );
 827                                 }
 828                         }
 829
 830                         # Non-existent pages
 831                         if( $this->getID() === 0 ) {
 832                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 833                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 834                                 if( !$this->hasViewableContent() ) {
 835                                         // If there's no backing content, send a 404 Not Found
 836                                         // for better machine handling of broken links.
 837                                         $return404 = true;
 838                                 }
 839                         }
 840
 841                         if( $return404 ) {
 842                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 843                         }
 844
 845                         # Another whitelist check in case oldid is altering the title
 846                         if( !$this->mTitle->userCanRead() ) {
 847                                 $wgOut->loginToUse();
 848                                 $wgOut->output();
 849                                 wfProfileOut( __METHOD__ );
 850                                 exit;
 851                         }
 852
 853                         # We're looking at an old revision
 854                         if( !empty( $oldid ) ) {
 855                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 856                                 if( is_null( $this->mRevision ) ) {
 857                                         // FIXME: This would be a nice place to load the 'no such page' text.
 858                                 } else {
 859                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 860                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 861                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 862                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 863                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 864                                                         wfProfileOut( __METHOD__ );
 865                                                         return;
 866                                                 } else {
 867                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 868                                                         // and we are allowed to see...
 869                                                 }
 870                                         }
 871                                 }
 872                         }
 873
 874                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 875
 876                          // Pages containing custom CSS or JavaScript get special treatment
 877                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 878                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 879                                 // Give hooks a chance to customise the output
 880                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 881                                         // Wrap the whole lot in a <pre> and don't parse
 882                                         $m = array();
 883                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 884                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 885                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 886                                         $wgOut->addHTML( "\n</pre>\n" );
 887                                 }
 888                         } else if( $rt = Title::newFromRedirect( $text ) ) {
 889                                 # Don't append the subtitle if this was an old revision
 890                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 891                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 892                                 $wgOut->addParserOutputNoText( $parseout );
 893                         } else if( $pcache ) {
 894                                 # Display content and save to parser cache
 895                                 $this->outputWikiText( $text );
 896                         } else {
 897                                 # Display content, don't attempt to save to parser cache
 898                                 # Don't show section-edit links on old revisions... this way lies madness.
 899                                 if( !$this->isCurrent() ) {
 900                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 901                                 }
 902                                 # Display content and don't save to parser cache
 903                                 # With timing hack -- TS 2006-07-26
 904                                 $time = -wfTime();
 905                                 $this->outputWikiText( $text, false );
 906                                 $time += wfTime();
 907
 908                                 # Timing hack
 909                                 if( $time > 3 ) {
 910                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 911                                                 $this->mTitle->getPrefixedDBkey()));
 912                                 }
 913
 914                                 if( !$this->isCurrent() ) {
 915                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 916                                 }
 917                         }
 918                 }
 919                 /* title may have been set from the cache */
 920                 $t = $wgOut->getPageTitle();
 921                 if( empty( $t ) ) {
 922                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 923
 924                         # For the main page, overwrite the <title> element with the con-
 925                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 926                         # that's not empty).
 927                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 928                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 929                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 930                         }
 931                 }
 932
 933                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 934                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 935                         $wgOut->addWikiMsg('anontalkpagetext');
 936                 }
 937
 938                 # If we have been passed an &rcid= parameter, we want to give the user a
 939                 # chance to mark this new article as patrolled.
 940                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->userCan('patrol') ) {
 941                         $wgOut->addHTML(
 942                                 "<div class='patrollink'>" .
 943                                         wfMsgHtml( 'markaspatrolledlink',
 944                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 945                                                 "action=markpatrolled&rcid=$rcid" )
 946                                         ) .
 947                                 '</div>'
 948                          );
 949                 }
 950
 951                 # Trackbacks
 952                 if( $wgUseTrackbacks ) {
 953                         $this->addTrackbacks();
 954                 }
 955
 956                 $this->viewUpdates();
 957                 wfProfileOut( __METHOD__ );
 958         }
 959
 960         protected function showDeletionLog() {
 961                 global $wgUser, $wgOut;
 962                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 963                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 964                 if( $pager->getNumRows() > 0 ) {
 965                         $pager->mLimit = 10;
 966                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
 967                         $wgOut->addWikiMsg( 'deleted-notice' );
 968                         $wgOut->addHTML(
 969                                 $loglist->beginLogEventsList() .
 970                                 $pager->getBody() .
 971                                 $loglist->endLogEventsList()
 972                         );
 973                         if( $pager->getNumRows() > 10 ) {
 974                                 $wgOut->addHTML( $wgUser->getSkin()->link(
 975                                         SpecialPage::getTitleFor( 'Log' ),
 976                                         wfMsgHtml( 'deletelog-fulllog' ),
 977                                         array(),
 978                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
 979                                 ) );
 980                         }
 981                         $wgOut->addHTML( '</div>' );
 982                 }
 983         }
 984
 985         /*
 986         * Should the parser cache be used?
 987         */
 988         protected function useParserCache( $oldid ) {
 989                 global $wgUser, $wgEnableParserCache;
 990
 991                 return $wgEnableParserCache
 992                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 993                         && $this->exists()
 994                         && empty( $oldid )
 995                         && !$this->mTitle->isCssOrJsPage()
 996                         && !$this->mTitle->isCssJsSubpage();
 997         }
 998
 999         /**
1000          * View redirect
1001          * @param $target Title object of destination to redirect
1002          * @param $appendSubtitle Boolean [optional]
1003          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1004          */
1005         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1006                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1007                 # Display redirect
1008                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1009                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
1010
1011                 if( $appendSubtitle ) {
1012                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1013                 }
1014                 $sk = $wgUser->getSkin();
1015                 if( $forceKnown ) {
1016                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1017                 } else {
1018                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1019                 }
1020                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1021                         '<span class="redirectText">'.$link.'</span>';
1022
1023         }
1024
1025         public function addTrackbacks() {
1026                 global $wgOut, $wgUser;
1027                 $dbr = wfGetDB( DB_SLAVE );
1028                 $tbs = $dbr->select( 'trackbacks',
1029                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1030                         array('tb_page' => $this->getID() )
1031                 );
1032                 if( !$dbr->numRows($tbs) ) return;
1033
1034                 $tbtext = "";
1035                 while( $o = $dbr->fetchObject($tbs) ) {
1036                         $rmvtxt = "";
1037                         if( $wgUser->isAllowed( 'trackback' ) ) {
1038                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1039                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1040                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1041                         }
1042                         $tbtext .= "\n";
1043                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1044                                         $o->tb_title,
1045                                         $o->tb_url,
1046                                         $o->tb_ex,
1047                                         $o->tb_name,
1048                                         $rmvtxt);
1049                 }
1050                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1051                 $this->mTitle->invalidateCache();
1052         }
1053
1054         public function deletetrackback() {
1055                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1056                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1057                         $wgOut->addWikiMsg( 'sessionfailure' );
1058                         return;
1059                 }
1060
1061                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1062                 if( count($permission_errors) ) {
1063                         $wgOut->showPermissionsErrorPage( $permission_errors );
1064                         return;
1065                 }
1066
1067                 $db = wfGetDB( DB_MASTER );
1068                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1069
1070                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1071                 $this->mTitle->invalidateCache();
1072         }
1073
1074         public function render() {
1075                 global $wgOut;
1076                 $wgOut->setArticleBodyOnly(true);
1077                 $this->view();
1078         }
1079
1080         /**
1081          * Handle action=purge
1082          */
1083         public function purge() {
1084                 global $wgUser, $wgRequest, $wgOut;
1085                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1086                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1087                                 $this->doPurge();
1088                                 $this->view();
1089                         }
1090                 } else {
1091                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1092                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1093                         $form = "<form method=\"post\" action=\"$action\">\n" .
1094                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1095                                         "</form>\n";
1096                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1097                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1098                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1099                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1100                         $wgOut->addHTML( $top . $form . $bottom );
1101                 }
1102         }
1103
1104         /**
1105          * Perform the actions of a page purging
1106          */
1107         public function doPurge() {
1108                 global $wgUseSquid;
1109                 // Invalidate the cache
1110                 $this->mTitle->invalidateCache();
1111
1112                 if( $wgUseSquid ) {
1113                         // Commit the transaction before the purge is sent
1114                         $dbw = wfGetDB( DB_MASTER );
1115                         $dbw->immediateCommit();
1116
1117                         // Send purge
1118                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1119                         $update->doUpdate();
1120                 }
1121                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1122                         global $wgMessageCache;
1123                         if( $this->getID() == 0 ) {
1124                                 $text = false;
1125                         } else {
1126                                 $text = $this->getContent();
1127                         }
1128                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1129                 }
1130         }
1131
1132         /**
1133          * Insert a new empty page record for this article.
1134          * This *must* be followed up by creating a revision
1135          * and running $this->updateToLatest( $rev_id );
1136          * or else the record will be left in a funky state.
1137          * Best if all done inside a transaction.
1138          *
1139          * @param $dbw Database
1140          * @return int The newly created page_id key, or false if the title already existed
1141          * @private
1142          */
1143         public function insertOn( $dbw ) {
1144                 wfProfileIn( __METHOD__ );
1145
1146                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1147                 $dbw->insert( 'page', array(
1148                         'page_id'           => $page_id,
1149                         'page_namespace'    => $this->mTitle->getNamespace(),
1150                         'page_title'        => $this->mTitle->getDBkey(),
1151                         'page_counter'      => 0,
1152                         'page_restrictions' => '',
1153                         'page_is_redirect'  => 0, # Will set this shortly...
1154                         'page_is_new'       => 1,
1155                         'page_random'       => wfRandom(),
1156                         'page_touched'      => $dbw->timestamp(),
1157                         'page_latest'       => 0, # Fill this in shortly...
1158                         'page_len'          => 0, # Fill this in shortly...
1159                 ), __METHOD__, 'IGNORE' );
1160
1161                 $affected = $dbw->affectedRows();
1162                 if( $affected ) {
1163                         $newid = $dbw->insertId();
1164                         $this->mTitle->resetArticleId( $newid );
1165                 }
1166                 wfProfileOut( __METHOD__ );
1167                 return $affected ? $newid : false;
1168         }
1169
1170         /**
1171          * Update the page record to point to a newly saved revision.
1172          *
1173          * @param $dbw Database object
1174          * @param $revision Revision: For ID number, and text used to set
1175                             length and redirect status fields
1176          * @param $lastRevision Integer: if given, will not overwrite the page field
1177          *                      when different from the currently set value.
1178          *                      Giving 0 indicates the new page flag should be set
1179          *                      on.
1180          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1181          *                                                       removing rows in redirect table.
1182          * @return bool true on success, false on failure
1183          * @private
1184          */
1185         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1186                 wfProfileIn( __METHOD__ );
1187
1188                 $text = $revision->getText();
1189                 $rt = Title::newFromRedirect( $text );
1190
1191                 $conditions = array( 'page_id' => $this->getId() );
1192                 if( !is_null( $lastRevision ) ) {
1193                         # An extra check against threads stepping on each other
1194                         $conditions['page_latest'] = $lastRevision;
1195                 }
1196
1197                 $dbw->update( 'page',
1198                         array( /* SET */
1199                                 'page_latest'      => $revision->getId(),
1200                                 'page_touched'     => $dbw->timestamp(),
1201                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1202                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1203                                 'page_len'         => strlen( $text ),
1204                         ),
1205                         $conditions,
1206                         __METHOD__ );
1207
1208                 $result = $dbw->affectedRows() != 0;
1209                 if( $result ) {
1210                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1211                 }
1212
1213                 wfProfileOut( __METHOD__ );
1214                 return $result;
1215         }
1216
1217         /**
1218          * Add row to the redirect table if this is a redirect, remove otherwise.
1219          *
1220          * @param $dbw Database
1221          * @param $redirectTitle a title object pointing to the redirect target,
1222          *                                               or NULL if this is not a redirect
1223          * @param $lastRevIsRedirect If given, will optimize adding and
1224          *                                                       removing rows in redirect table.
1225          * @return bool true on success, false on failure
1226          * @private
1227          */
1228         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1229                 // Always update redirects (target link might have changed)
1230                 // Update/Insert if we don't know if the last revision was a redirect or not
1231                 // Delete if changing from redirect to non-redirect
1232                 $isRedirect = !is_null($redirectTitle);
1233                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1234                         wfProfileIn( __METHOD__ );
1235                         if( $isRedirect ) {
1236                                 // This title is a redirect, Add/Update row in the redirect table
1237                                 $set = array( /* SET */
1238                                         'rd_namespace' => $redirectTitle->getNamespace(),
1239                                         'rd_title'     => $redirectTitle->getDBkey(),
1240                                         'rd_from'      => $this->getId(),
1241                                 );
1242                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1243                         } else {
1244                                 // This is not a redirect, remove row from redirect table
1245                                 $where = array( 'rd_from' => $this->getId() );
1246                                 $dbw->delete( 'redirect', $where, __METHOD__);
1247                         }
1248                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1249                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1250                         }
1251                         wfProfileOut( __METHOD__ );
1252                         return ( $dbw->affectedRows() != 0 );
1253                 }
1254                 return true;
1255         }
1256
1257         /**
1258          * If the given revision is newer than the currently set page_latest,
1259          * update the page record. Otherwise, do nothing.
1260          *
1261          * @param $dbw Database object
1262          * @param $revision Revision object
1263          */
1264         public function updateIfNewerOn( &$dbw, $revision ) {
1265                 wfProfileIn( __METHOD__ );
1266                 $row = $dbw->selectRow(
1267                         array( 'revision', 'page' ),
1268                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1269                         array(
1270                                 'page_id' => $this->getId(),
1271                                 'page_latest=rev_id' ),
1272                         __METHOD__ );
1273                 if( $row ) {
1274                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1275                                 wfProfileOut( __METHOD__ );
1276                                 return false;
1277                         }
1278                         $prev = $row->rev_id;
1279                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1280                 } else {
1281                         # No or missing previous revision; mark the page as new
1282                         $prev = 0;
1283                         $lastRevIsRedirect = null;
1284                 }
1285                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1286                 wfProfileOut( __METHOD__ );
1287                 return $ret;
1288         }
1289
1290         /**
1291          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1292          * @return string Complete article text, or null if error
1293          */
1294         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1295                 wfProfileIn( __METHOD__ );
1296                 if( strval( $section ) == '' ) {
1297                         // Whole-page edit; let the whole text through
1298                 } else {
1299                         if( is_null($edittime) ) {
1300                                 $rev = Revision::newFromTitle( $this->mTitle );
1301                         } else {
1302                                 $dbw = wfGetDB( DB_MASTER );
1303                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1304                         }
1305                         if( !$rev ) {
1306                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1307                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1308                                 return null;
1309                         }
1310                         $oldtext = $rev->getText();
1311
1312                         if( $section == 'new' ) {
1313                                 # Inserting a new section
1314                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1315                                 $text = strlen( trim( $oldtext ) ) > 0
1316                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1317                                                 : "{$subject}{$text}";
1318                         } else {
1319                                 # Replacing an existing section; roll out the big guns
1320                                 global $wgParser;
1321                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1322                         }
1323                 }
1324                 wfProfileOut( __METHOD__ );
1325                 return $text;
1326         }
1327
1328         /**
1329          * @deprecated use Article::doEdit()
1330          */
1331         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1332                 wfDeprecated( __METHOD__ );
1333                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1334                         ( $isminor ? EDIT_MINOR : 0 ) |
1335                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1336                         ( $bot ? EDIT_FORCE_BOT : 0 );
1337
1338                 # If this is a comment, add the summary as headline
1339                 if( $comment && $summary != "" ) {
1340                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1341                 }
1342
1343                 $this->doEdit( $text, $summary, $flags );
1344
1345                 $dbw = wfGetDB( DB_MASTER );
1346                 if($watchthis) {
1347                         if(!$this->mTitle->userIsWatching()) {
1348                                 $dbw->begin();
1349                                 $this->doWatch();
1350                                 $dbw->commit();
1351                         }
1352                 } else {
1353                         if( $this->mTitle->userIsWatching() ) {
1354                                 $dbw->begin();
1355                                 $this->doUnwatch();
1356                                 $dbw->commit();
1357                         }
1358                 }
1359                 $this->doRedirect( $this->isRedirect( $text ) );
1360         }
1361
1362         /**
1363          * @deprecated use Article::doEdit()
1364          */
1365         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1366                 wfDeprecated( __METHOD__ );
1367                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1368                         ( $minor ? EDIT_MINOR : 0 ) |
1369                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1370
1371                 $status = $this->doEdit( $text, $summary, $flags );
1372                 if( !$status->isOK() ) {
1373                         return false;
1374                 }
1375
1376                 $dbw = wfGetDB( DB_MASTER );
1377                 if( $watchthis ) {
1378                         if(!$this->mTitle->userIsWatching()) {
1379                                 $dbw->begin();
1380                                 $this->doWatch();
1381                                 $dbw->commit();
1382                         }
1383                 } else {
1384                         if( $this->mTitle->userIsWatching() ) {
1385                                 $dbw->begin();
1386                                 $this->doUnwatch();
1387                                 $dbw->commit();
1388                         }
1389                 }
1390
1391                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1392                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1393
1394                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1395                 return true;
1396         }
1397
1398         /**
1399          * Article::doEdit()
1400          *
1401          * Change an existing article or create a new article. Updates RC and all necessary caches,
1402          * optionally via the deferred update array.
1403          *
1404          * $wgUser must be set before calling this function.
1405          *
1406          * @param $text String: new text
1407          * @param $summary String: edit summary
1408          * @param $flags Integer bitfield:
1409          *      EDIT_NEW
1410          *          Article is known or assumed to be non-existent, create a new one
1411          *      EDIT_UPDATE
1412          *          Article is known or assumed to be pre-existing, update it
1413          *      EDIT_MINOR
1414          *          Mark this edit minor, if the user is allowed to do so
1415          *      EDIT_SUPPRESS_RC
1416          *          Do not log the change in recentchanges
1417          *      EDIT_FORCE_BOT
1418          *          Mark the edit a "bot" edit regardless of user rights
1419          *      EDIT_DEFER_UPDATES
1420          *          Defer some of the updates until the end of index.php
1421          *      EDIT_AUTOSUMMARY
1422          *          Fill in blank summaries with generated text where possible
1423          *
1424          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1425          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1426          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1427          * edit-already-exists error will be returned. These two conditions are also possible with
1428          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1429          *
1430          * @param $baseRevId the revision ID this edit was based off, if any
1431          * @param $user Optional user object, $wgUser will be used if not passed
1432          *
1433          * @return Status object. Possible errors:
1434          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1435          *     edit-gone-missing:       In update mode, but the article didn't exist
1436          *     edit-conflict:           In update mode, the article changed unexpectedly
1437          *     edit-no-change:          Warning that the text was the same as before
1438          *     edit-already-exists:     In creation mode, but the article already exists
1439          *
1440          *  Extensions may define additional errors.
1441          *
1442          *  $return->value will contain an associative array with members as follows:
1443          *     new:                     Boolean indicating if the function attempted to create a new article
1444          *     revision:                The revision object for the inserted revision, or null
1445          *
1446          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1447          */
1448         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1449                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1450
1451                 # Low-level sanity check
1452                 if( $this->mTitle->getText() == '' ) {
1453                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1454                 }
1455
1456                 wfProfileIn( __METHOD__ );
1457
1458                 $user = is_null($user) ? $wgUser : $user;
1459                 $status = Status::newGood( array() );
1460
1461                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1462                 $this->loadPageData();
1463
1464                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1465                         $aid = $this->mTitle->getArticleID();
1466                         if( $aid ) {
1467                                 $flags |= EDIT_UPDATE;
1468                         } else {
1469                                 $flags |= EDIT_NEW;
1470                         }
1471                 }
1472
1473                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1474                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1475                 {
1476                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1477                         wfProfileOut( __METHOD__ );
1478                         if( $status->isOK() ) {
1479                                 $status->fatal( 'edit-hook-aborted');
1480                         }
1481                         return $status;
1482                 }
1483
1484                 # Silently ignore EDIT_MINOR if not allowed
1485                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1486                 $bot = $flags & EDIT_FORCE_BOT;
1487
1488                 $oldtext = $this->getContent();
1489                 $oldsize = strlen( $oldtext );
1490
1491                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1492                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1493                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1494                 }
1495
1496                 $editInfo = $this->prepareTextForEdit( $text );
1497                 $text = $editInfo->pst;
1498                 $newsize = strlen( $text );
1499
1500                 $dbw = wfGetDB( DB_MASTER );
1501                 $now = wfTimestampNow();
1502
1503                 if( $flags & EDIT_UPDATE ) {
1504                         # Update article, but only if changed.
1505                         $status->value['new'] = false;
1506                         # Make sure the revision is either completely inserted or not inserted at all
1507                         if( !$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                                         global $wgUseRCPatrol;
1561                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1562                                         # Update recentchanges
1563                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1564                                                 # Mark as patrolled if the user can do so
1565                                                 $patrolled = $wgUseRCPatrol && $user->isAllowed('autopatrol');
1566                                                 # Add RC row to the DB
1567                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1568                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1569                                                         $revisionId, $patrolled
1570                                                 );
1571                                                 # Log auto-patrolled edits
1572                                                 if( $patrolled ) {
1573                                                         PatrolLog::record( $rc, true );
1574                                                 }
1575                                         }
1576                                         $user->incEditCount();
1577                                         $dbw->commit();
1578                                 }
1579                         } else {
1580                                 $status->warning( 'edit-no-change' );
1581                                 $revision = null;
1582                                 // Keep the same revision ID, but do some updates on it
1583                                 $revisionId = $this->getRevIdFetched();
1584                                 // Update page_touched, this is usually implicit in the page update
1585                                 // Other cache updates are done in onArticleEdit()
1586                                 $this->mTitle->invalidateCache();
1587                         }
1588
1589                         if( !$wgDBtransactions ) {
1590                                 ignore_user_abort( $userAbort );
1591                         }
1592                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1593                         if( !$status->isOK() ) {
1594                                 wfProfileOut( __METHOD__ );
1595                                 return $status;
1596                         }
1597
1598                         # Invalidate cache of this article and all pages using this article
1599                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1600                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1601                         # Update links tables, site stats, etc.
1602                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1603                 } else {
1604                         # Create new article
1605                         $status->value['new'] = true;
1606
1607                         # Set statistics members
1608                         # We work out if it's countable after PST to avoid counter drift
1609                         # when articles are created with {{subst:}}
1610                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1611                         $this->mTotalAdjustment = 1;
1612
1613                         $dbw->begin();
1614
1615                         # Add the page record; stake our claim on this title!
1616                         # This will return false if the article already exists
1617                         $newid = $this->insertOn( $dbw );
1618
1619                         if( $newid === false ) {
1620                                 $dbw->rollback();
1621                                 $status->fatal( 'edit-already-exists' );
1622                                 wfProfileOut( __METHOD__ );
1623                                 return $status;
1624                         }
1625
1626                         # Save the revision text...
1627                         $revision = new Revision( array(
1628                                 'page'       => $newid,
1629                                 'comment'    => $summary,
1630                                 'minor_edit' => $isminor,
1631                                 'text'       => $text,
1632                                 'user'       => $user->getId(),
1633                                 'user_text'  => $user->getName(),
1634                                 ) );
1635                         $revisionId = $revision->insertOn( $dbw );
1636
1637                         $this->mTitle->resetArticleID( $newid );
1638
1639                         # Update the page record with revision data
1640                         $this->updateRevisionOn( $dbw, $revision, 0 );
1641
1642                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1643                         # Update recentchanges
1644                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1645                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1646                                 # Mark as patrolled if the user can do so
1647                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $user->isAllowed('autopatrol');
1648                                 # Add RC row to the DB
1649                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1650                                         '', strlen($text), $revisionId, $patrolled );
1651                                 # Log auto-patrolled edits
1652                                 if( $patrolled ) {
1653                                         PatrolLog::record( $rc, true );
1654                                 }
1655                         }
1656                         $user->incEditCount();
1657                         $dbw->commit();
1658
1659                         # Update links, etc.
1660                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1661
1662                         # Clear caches
1663                         Article::onArticleCreate( $this->mTitle );
1664
1665                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1666                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1667                 }
1668
1669                 # Do updates right now unless deferral was requested
1670                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1671                         wfDoUpdates();
1672                 }
1673
1674                 // Return the new revision (or null) to the caller
1675                 $status->value['revision'] = $revision;
1676
1677                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1678                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1679
1680                 wfProfileOut( __METHOD__ );
1681                 return $status;
1682         }
1683
1684         /**
1685          * @deprecated wrapper for doRedirect
1686          */
1687         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1688                 wfDeprecated( __METHOD__ );
1689                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1690         }
1691
1692         /**
1693          * Output a redirect back to the article.
1694          * This is typically used after an edit.
1695          *
1696          * @param $noRedir Boolean: add redirect=no
1697          * @param $sectionAnchor String: section to redirect to, including "#"
1698          * @param $extraQuery String: extra query params
1699          */
1700         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1701                 global $wgOut;
1702                 if( $noRedir ) {
1703                         $query = 'redirect=no';
1704                         if( $extraQuery )
1705                                 $query .= "&$query";
1706                 } else {
1707                         $query = $extraQuery;
1708                 }
1709                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1710         }
1711
1712         /**
1713          * Mark this particular edit/page as patrolled
1714          */
1715         public function markpatrolled() {
1716                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1717                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1718
1719                 # If we haven't been given an rc_id value, we can't do anything
1720                 $rcid = (int) $wgRequest->getVal('rcid');
1721                 $rc = RecentChange::newFromId($rcid);
1722                 if( is_null($rc) ) {
1723                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1724                         return;
1725                 }
1726
1727                 #It would be nice to see where the user had actually come from, but for now just guess
1728                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1729                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1730
1731                 $dbw = wfGetDB( DB_MASTER );
1732                 $errors = $rc->doMarkPatrolled();
1733
1734                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1735                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1736                         return;
1737                 }
1738
1739                 if( in_array(array('hookaborted'), $errors) ) {
1740                         // The hook itself has handled any output
1741                         return;
1742                 }
1743
1744                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1745                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1746                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1747                         $wgOut->returnToMain( false, $return );
1748                         return;
1749                 }
1750
1751                 if( !empty($errors) ) {
1752                         $wgOut->showPermissionsErrorPage( $errors );
1753                         return;
1754                 }
1755
1756                 # Inform the user
1757                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1758                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1759                 $wgOut->returnToMain( false, $return );
1760         }
1761
1762         /**
1763          * User-interface handler for the "watch" action
1764          */
1765
1766         public function watch() {
1767                 global $wgUser, $wgOut;
1768                 if( $wgUser->isAnon() ) {
1769                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1770                         return;
1771                 }
1772                 if( wfReadOnly() ) {
1773                         $wgOut->readOnlyPage();
1774                         return;
1775                 }
1776                 if( $this->doWatch() ) {
1777                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1778                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1779                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1780                 }
1781                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1782         }
1783
1784         /**
1785          * Add this page to $wgUser's watchlist
1786          * @return bool true on successful watch operation
1787          */
1788         public function doWatch() {
1789                 global $wgUser;
1790                 if( $wgUser->isAnon() ) {
1791                         return false;
1792                 }
1793                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1794                         $wgUser->addWatch( $this->mTitle );
1795                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1796                 }
1797                 return false;
1798         }
1799
1800         /**
1801          * User interface handler for the "unwatch" action.
1802          */
1803         public function unwatch() {
1804                 global $wgUser, $wgOut;
1805                 if( $wgUser->isAnon() ) {
1806                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1807                         return;
1808                 }
1809                 if( wfReadOnly() ) {
1810                         $wgOut->readOnlyPage();
1811                         return;
1812                 }
1813                 if( $this->doUnwatch() ) {
1814                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1815                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1816                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1817                 }
1818                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1819         }
1820
1821         /**
1822          * Stop watching a page
1823          * @return bool true on successful unwatch
1824          */
1825         public function doUnwatch() {
1826                 global $wgUser;
1827                 if( $wgUser->isAnon() ) {
1828                         return false;
1829                 }
1830                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1831                         $wgUser->removeWatch( $this->mTitle );
1832                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1833                 }
1834                 return false;
1835         }
1836
1837         /**
1838          * action=protect handler
1839          */
1840         public function protect() {
1841                 $form = new ProtectionForm( $this );
1842                 $form->execute();
1843         }
1844
1845         /**
1846          * action=unprotect handler (alias)
1847          */
1848         public function unprotect() {
1849                 $this->protect();
1850         }
1851
1852         /**
1853          * Update the article's restriction field, and leave a log entry.
1854          *
1855          * @param $limit Array: set of restriction keys
1856          * @param $reason String
1857          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1858          * @param $expiry Array: per restriction type expiration
1859          * @return bool true on success
1860          */
1861         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1862                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1863
1864                 $id = $this->mTitle->getArticleID();
1865                 if( $id <= 0 || wfReadOnly() || !$this->mTitle->userCan('protect') ) {
1866                         return false;
1867                 }
1868
1869                 if( !$cascade ) {
1870                         $cascade = false;
1871                 }
1872
1873                 // Take this opportunity to purge out expired restrictions
1874                 Title::purgeExpiredRestrictions();
1875
1876                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1877                 # we expect a single selection, but the schema allows otherwise.
1878                 $current = array();
1879                 $updated = Article::flattenRestrictions( $limit );
1880                 $changed = false;
1881                 foreach( $wgRestrictionTypes as $action ) {
1882                         if( isset( $expiry[$action] ) ) {
1883                                 # Get current restrictions on $action
1884                                 $aLimits = $this->mTitle->getRestrictions( $action );
1885                                 $current[$action] = implode( '', $aLimits );
1886                                 # Are any actual restrictions being dealt with here?
1887                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1888                                 # If something changed, we need to log it. Checking $aRChanged
1889                                 # assures that "unprotecting" a page that is not protected does
1890                                 # not log just because the expiry was "changed".
1891                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1892                                         $changed = true;
1893                                 }
1894                         }
1895                 }
1896
1897                 $current = Article::flattenRestrictions( $current );
1898
1899                 $changed = ($changed || $current != $updated );
1900                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1901                 $protect = ( $updated != '' );
1902
1903                 # If nothing's changed, do nothing
1904                 if( $changed ) {
1905                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1906
1907                                 $dbw = wfGetDB( DB_MASTER );
1908
1909                                 # Prepare a null revision to be added to the history
1910                                 $modified = $current != '' && $protect;
1911                                 if( $protect ) {
1912                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1913                                 } else {
1914                                         $comment_type = 'unprotectedarticle';
1915                                 }
1916                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1917
1918                                 # Only restrictions with the 'protect' right can cascade...
1919                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1920                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1921                                 # The schema allows multiple restrictions
1922                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
1923                                         $cascade = false;
1924                                 $cascade_description = '';
1925                                 if( $cascade ) {
1926                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1927                                 }
1928
1929                                 if( $reason )
1930                                         $comment .= ": $reason";
1931
1932                                 $editComment = $comment;
1933                                 $encodedExpiry = array();
1934                                 $protect_description = '';
1935                                 foreach( $limit as $action => $restrictions  ) {
1936                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1937                                         if( $restrictions != '' ) {
1938                                                 $protect_description .= "[$action=$restrictions] (";
1939                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1940                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1941                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1942                                                 } else {
1943                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1944                                                 }
1945                                                 $protect_description .= ') ';
1946                                         }
1947                                 }
1948                                 $protect_description = trim($protect_description);
1949
1950                                 if( $protect_description && $protect )
1951                                         $editComment .= " ($protect_description)";
1952                                 if( $cascade )
1953                                         $editComment .= "$cascade_description";
1954                                 # Update restrictions table
1955                                 foreach( $limit as $action => $restrictions ) {
1956                                         if($restrictions != '' ) {
1957                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1958                                                         array( 'pr_page' => $id,
1959                                                                 'pr_type' => $action,
1960                                                                 'pr_level' => $restrictions,
1961                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1962                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1963                                         } else {
1964                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1965                                                         'pr_type' => $action ), __METHOD__ );
1966                                         }
1967                                 }
1968
1969                                 # Insert a null revision
1970                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1971                                 $nullRevId = $nullRevision->insertOn( $dbw );
1972
1973                                 $latest = $this->getLatest();
1974                                 # Update page record
1975                                 $dbw->update( 'page',
1976                                         array( /* SET */
1977                                                 'page_touched' => $dbw->timestamp(),
1978                                                 'page_restrictions' => '',
1979                                                 'page_latest' => $nullRevId
1980                                         ), array( /* WHERE */
1981                                                 'page_id' => $id
1982                                         ), 'Article::protect'
1983                                 );
1984
1985                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
1986                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1987
1988                                 # Update the protection log
1989                                 $log = new LogPage( 'protect' );
1990                                 if( $protect ) {
1991                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1992                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1993                                 } else {
1994                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1995                                 }
1996
1997                         } # End hook
1998                 } # End "changed" check
1999
2000                 return true;
2001         }
2002
2003         /**
2004          * Take an array of page restrictions and flatten it to a string
2005          * suitable for insertion into the page_restrictions field.
2006          * @param $limit Array
2007          * @return String
2008          */
2009         protected static function flattenRestrictions( $limit ) {
2010                 if( !is_array( $limit ) ) {
2011                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2012                 }
2013                 $bits = array();
2014                 ksort( $limit );
2015                 foreach( $limit as $action => $restrictions ) {
2016                         if( $restrictions != '' ) {
2017                                 $bits[] = "$action=$restrictions";
2018                         }
2019                 }
2020                 return implode( ':', $bits );
2021         }
2022
2023         /**
2024          * Auto-generates a deletion reason
2025          * @param &$hasHistory Boolean: whether the page has a history
2026          */
2027         public function generateReason( &$hasHistory ) {
2028                 global $wgContLang;
2029                 $dbw = wfGetDB( DB_MASTER );
2030                 // Get the last revision
2031                 $rev = Revision::newFromTitle( $this->mTitle );
2032                 if( is_null( $rev ) )
2033                         return false;
2034
2035                 // Get the article's contents
2036                 $contents = $rev->getText();
2037                 $blank = false;
2038                 // If the page is blank, use the text from the previous revision,
2039                 // which can only be blank if there's a move/import/protect dummy revision involved
2040                 if( $contents == '' ) {
2041                         $prev = $rev->getPrevious();
2042                         if( $prev )     {
2043                                 $contents = $prev->getText();
2044                                 $blank = true;
2045                         }
2046                 }
2047
2048                 // Find out if there was only one contributor
2049                 // Only scan the last 20 revisions
2050                 $limit = 20;
2051                 $res = $dbw->select( 'revision', 'rev_user_text',
2052                         array( 'rev_page' => $this->getID() ), __METHOD__,
2053                         array( 'LIMIT' => $limit )
2054                 );
2055                 if( $res === false )
2056                         // This page has no revisions, which is very weird
2057                         return false;
2058                 if( $res->numRows() > 1 )
2059                                 $hasHistory = true;
2060                 else
2061                                 $hasHistory = false;
2062                 $row = $dbw->fetchObject( $res );
2063                 $onlyAuthor = $row->rev_user_text;
2064                 // Try to find a second contributor
2065                 foreach( $res as $row ) {
2066                         if( $row->rev_user_text != $onlyAuthor ) {
2067                                 $onlyAuthor = false;
2068                                 break;
2069                         }
2070                 }
2071                 $dbw->freeResult( $res );
2072
2073                 // Generate the summary with a '$1' placeholder
2074                 if( $blank ) {
2075                         // The current revision is blank and the one before is also
2076                         // blank. It's just not our lucky day
2077                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2078                 } else {
2079                         if( $onlyAuthor )
2080                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2081                         else
2082                                 $reason = wfMsgForContent( 'excontent', '$1' );
2083                 }
2084
2085                 if( $reason == '-' ) {
2086                         // Allow these UI messages to be blanked out cleanly
2087                         return '';
2088                 }
2089
2090                 // Replace newlines with spaces to prevent uglyness
2091                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2092                 // Calculate the maximum amount of chars to get
2093                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2094                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2095                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2096                 // Remove possible unfinished links
2097                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2098                 // Now replace the '$1' placeholder
2099                 $reason = str_replace( '$1', $contents, $reason );
2100                 return $reason;
2101         }
2102
2103
2104         /*
2105          * UI entry point for page deletion
2106          */
2107         public function delete() {
2108                 global $wgUser, $wgOut, $wgRequest;
2109
2110                 $confirm = $wgRequest->wasPosted() &&
2111                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2112
2113                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2114                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2115
2116                 $reason = $this->DeleteReasonList;
2117
2118                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2119                         // Entry from drop down menu + additional comment
2120                         $reason .= ': ' . $this->DeleteReason;
2121                 } elseif( $reason == 'other' ) {
2122                         $reason = $this->DeleteReason;
2123                 }
2124                 # Flag to hide all contents of the archived revisions
2125                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2126
2127                 # This code desperately needs to be totally rewritten
2128
2129                 # Read-only check...
2130                 if( wfReadOnly() ) {
2131                         $wgOut->readOnlyPage();
2132                         return;
2133                 }
2134
2135                 # Check permissions
2136                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2137
2138                 if( count( $permission_errors ) > 0 ) {
2139                         $wgOut->showPermissionsErrorPage( $permission_errors );
2140                         return;
2141                 }
2142
2143                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2144
2145                 # Better double-check that it hasn't been deleted yet!
2146                 $dbw = wfGetDB( DB_MASTER );
2147                 $conds = $this->mTitle->pageCond();
2148                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2149                 if( $latest === false ) {
2150                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2151                         return;
2152                 }
2153
2154                 # Hack for big sites
2155                 $bigHistory = $this->isBigDeletion();
2156                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2157                         global $wgLang, $wgDeleteRevisionsLimit;
2158                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2159                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2160                         return;
2161                 }
2162
2163                 if( $confirm ) {
2164                         $this->doDelete( $reason, $suppress );
2165                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2166                                 $this->doWatch();
2167                         } elseif( $this->mTitle->userIsWatching() ) {
2168                                 $this->doUnwatch();
2169                         }
2170                         return;
2171                 }
2172
2173                 // Generate deletion reason
2174                 $hasHistory = false;
2175                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2176
2177                 // If the page has a history, insert a warning
2178                 if( $hasHistory && !$confirm ) {
2179                         $skin = $wgUser->getSkin();
2180                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2181                         if( $bigHistory ) {
2182                                 global $wgLang, $wgDeleteRevisionsLimit;
2183                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2184                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2185                         }
2186                 }
2187
2188                 return $this->confirmDelete( $reason );
2189         }
2190
2191         /**
2192          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2193          */
2194         public function isBigDeletion() {
2195                 global $wgDeleteRevisionsLimit;
2196                 if( $wgDeleteRevisionsLimit ) {
2197                         $revCount = $this->estimateRevisionCount();
2198                         return $revCount > $wgDeleteRevisionsLimit;
2199                 }
2200                 return false;
2201         }
2202
2203         /**
2204          * @return int approximate revision count
2205          */
2206         public function estimateRevisionCount() {
2207                 $dbr = wfGetDB( DB_SLAVE );
2208                 // For an exact count...
2209                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2210                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2211                 return $dbr->estimateRowCount( 'revision', '*',
2212                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2213         }
2214
2215         /**
2216          * Get the last N authors
2217          * @param $num Integer: number of revisions to get
2218          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2219          * @return array Array of authors, duplicates not removed
2220          */
2221         public function getLastNAuthors( $num, $revLatest = 0 ) {
2222                 wfProfileIn( __METHOD__ );
2223                 // First try the slave
2224                 // If that doesn't have the latest revision, try the master
2225                 $continue = 2;
2226                 $db = wfGetDB( DB_SLAVE );
2227                 do {
2228                         $res = $db->select( array( 'page', 'revision' ),
2229                                 array( 'rev_id', 'rev_user_text' ),
2230                                 array(
2231                                         'page_namespace' => $this->mTitle->getNamespace(),
2232                                         'page_title' => $this->mTitle->getDBkey(),
2233                                         'rev_page = page_id'
2234                                 ), __METHOD__, $this->getSelectOptions( array(
2235                                         'ORDER BY' => 'rev_timestamp DESC',
2236                                         'LIMIT' => $num
2237                                 ) )
2238                         );
2239                         if( !$res ) {
2240                                 wfProfileOut( __METHOD__ );
2241                                 return array();
2242                         }
2243                         $row = $db->fetchObject( $res );
2244                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2245                                 $db = wfGetDB( DB_MASTER );
2246                                 $continue--;
2247                         } else {
2248                                 $continue = 0;
2249                         }
2250                 } while ( $continue );
2251
2252                 $authors = array( $row->rev_user_text );
2253                 while ( $row = $db->fetchObject( $res ) ) {
2254                         $authors[] = $row->rev_user_text;
2255                 }
2256                 wfProfileOut( __METHOD__ );
2257                 return $authors;
2258         }
2259
2260         /**
2261          * Output deletion confirmation dialog
2262          * @param $reason String: prefilled reason
2263          */
2264         public function confirmDelete( $reason ) {
2265                 global $wgOut, $wgUser;
2266
2267                 wfDebug( "Article::confirmDelete\n" );
2268
2269                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2270                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2271                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2272
2273                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2274                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2275                                         <td></td>
2276                                         <td class='mw-input'>" .
2277                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2278                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2279                                         "</td>
2280                                 </tr>";
2281                 } else {
2282                         $suppress = '';
2283                 }
2284                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2285
2286                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2287                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2288                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2289                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2290                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2291                         "<tr id=\"wpDeleteReasonListRow\">
2292                                 <td class='mw-label'>" .
2293                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2294                                 "</td>
2295                                 <td class='mw-input'>" .
2296                                         Xml::listDropDown( 'wpDeleteReasonList',
2297                                                 wfMsgForContent( 'deletereason-dropdown' ),
2298                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2299                                 "</td>
2300                         </tr>
2301                         <tr id=\"wpDeleteReasonRow\">
2302                                 <td class='mw-label'>" .
2303                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2304                                 "</td>
2305                                 <td class='mw-input'>" .
2306                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2307                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2308                                 "</td>
2309                         </tr>
2310                         <tr>
2311                                 <td></td>
2312                                 <td class='mw-input'>" .
2313                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2314                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2315                                 "</td>
2316                         </tr>
2317                         $suppress
2318                         <tr>
2319                                 <td></td>
2320                                 <td class='mw-submit'>" .
2321                                         Xml::submitButton( wfMsg( 'deletepage' ),
2322                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2323                                 "</td>
2324                         </tr>" .
2325                         Xml::closeElement( 'table' ) .
2326                         Xml::closeElement( 'fieldset' ) .
2327                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2328                         Xml::closeElement( 'form' );
2329
2330                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2331                                 $skin = $wgUser->getSkin();
2332                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2333                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2334                         }
2335
2336                 $wgOut->addHTML( $form );
2337                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2338         }
2339
2340         /**
2341          * Perform a deletion and output success or failure messages
2342          */
2343         public function doDelete( $reason, $suppress = false ) {
2344                 global $wgOut, $wgUser;
2345                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2346
2347                 $error = '';
2348                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2349                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2350                                 $deleted = $this->mTitle->getPrefixedText();
2351
2352                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2353                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2354
2355                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2356
2357                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2358                                 $wgOut->returnToMain( false );
2359                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2360                         } else {
2361                                 if( $error == '' )
2362                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2363                                 else
2364                                         $wgOut->showFatalError( $error );
2365                         }
2366                 }
2367         }
2368
2369         /**
2370          * Back-end article deletion
2371          * Deletes the article with database consistency, writes logs, purges caches
2372          * Returns success
2373          */
2374         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2375                 global $wgUseSquid, $wgDeferredUpdateList;
2376                 global $wgUseTrackbacks;
2377
2378                 wfDebug( __METHOD__."\n" );
2379
2380                 $dbw = wfGetDB( DB_MASTER );
2381                 $ns = $this->mTitle->getNamespace();
2382                 $t = $this->mTitle->getDBkey();
2383                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2384
2385                 if( $t == '' || $id == 0 ) {
2386                         return false;
2387                 }
2388
2389                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2390                 array_push( $wgDeferredUpdateList, $u );
2391
2392                 // Bitfields to further suppress the content
2393                 if( $suppress ) {
2394                         $bitfield = 0;
2395                         // This should be 15...
2396                         $bitfield |= Revision::DELETED_TEXT;
2397                         $bitfield |= Revision::DELETED_COMMENT;
2398                         $bitfield |= Revision::DELETED_USER;
2399                         $bitfield |= Revision::DELETED_RESTRICTED;
2400                 } else {
2401                         $bitfield = 'rev_deleted';
2402                 }
2403
2404                 $dbw->begin();
2405                 // For now, shunt the revision data into the archive table.
2406                 // Text is *not* removed from the text table; bulk storage
2407                 // is left intact to avoid breaking block-compression or
2408                 // immutable storage schemes.
2409                 //
2410                 // For backwards compatibility, note that some older archive
2411                 // table entries will have ar_text and ar_flags fields still.
2412                 //
2413                 // In the future, we may keep revisions and mark them with
2414                 // the rev_deleted field, which is reserved for this purpose.
2415                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2416                         array(
2417                                 'ar_namespace'  => 'page_namespace',
2418                                 'ar_title'      => 'page_title',
2419                                 'ar_comment'    => 'rev_comment',
2420                                 'ar_user'       => 'rev_user',
2421                                 'ar_user_text'  => 'rev_user_text',
2422                                 'ar_timestamp'  => 'rev_timestamp',
2423                                 'ar_minor_edit' => 'rev_minor_edit',
2424                                 'ar_rev_id'     => 'rev_id',
2425                                 'ar_text_id'    => 'rev_text_id',
2426                                 'ar_text'       => '\'\'', // Be explicit to appease
2427                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2428                                 'ar_len'        => 'rev_len',
2429                                 'ar_page_id'    => 'page_id',
2430                                 'ar_deleted'    => $bitfield
2431                         ), array(
2432                                 'page_id' => $id,
2433                                 'page_id = rev_page'
2434                         ), __METHOD__
2435                 );
2436
2437                 # Delete restrictions for it
2438                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2439
2440                 # Now that it's safely backed up, delete it
2441                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2442                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2443                 if( !$ok ) {
2444                         $dbw->rollback();
2445                         return false;
2446                 }
2447
2448                 # If using cascading deletes, we can skip some explicit deletes
2449                 if( !$dbw->cascadingDeletes() ) {
2450                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2451
2452                         if($wgUseTrackbacks)
2453                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2454
2455                         # Delete outgoing links
2456                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2457                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2458                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2459                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2460                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2461                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2462                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2463                 }
2464
2465                 # If using cleanup triggers, we can skip some manual deletes
2466                 if( !$dbw->cleanupTriggers() ) {
2467                         # Clean up recentchanges entries...
2468                         $dbw->delete( 'recentchanges',
2469                                 array( 'rc_type != '.RC_LOG,
2470                                         'rc_namespace' => $this->mTitle->getNamespace(),
2471                                         'rc_title' => $this->mTitle->getDBKey() ),
2472                                 __METHOD__ );
2473                         $dbw->delete( 'recentchanges',
2474                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2475                                 __METHOD__ );
2476                 }
2477
2478                 # Clear caches
2479                 Article::onArticleDelete( $this->mTitle );
2480
2481                 # Fix category table counts
2482                 $cats = array();
2483                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2484                 foreach( $res as $row ) {
2485                         $cats []= $row->cl_to;
2486                 }
2487                 $this->updateCategoryCounts( array(), $cats );
2488
2489                 # Clear the cached article id so the interface doesn't act like we exist
2490                 $this->mTitle->resetArticleID( 0 );
2491                 $this->mTitle->mArticleID = 0;
2492
2493                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2494                 $logtype = $suppress ? 'suppress' : 'delete';
2495                 $log = new LogPage( $logtype );
2496
2497                 # Make sure logging got through
2498                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2499
2500                 $dbw->commit();
2501
2502                 return true;
2503         }
2504
2505         /**
2506          * Roll back the most recent consecutive set of edits to a page
2507          * from the same user; fails if there are no eligible edits to
2508          * roll back to, e.g. user is the sole contributor. This function
2509          * performs permissions checks on $wgUser, then calls commitRollback()
2510          * to do the dirty work
2511          *
2512          * @param $fromP String: Name of the user whose edits to rollback.
2513          * @param $summary String: Custom summary. Set to default summary if empty.
2514          * @param $token String: Rollback token.
2515          * @param $bot Boolean: If true, mark all reverted edits as bot.
2516          *
2517          * @param $resultDetails Array: contains result-specific array of additional values
2518          *    'alreadyrolled' : 'current' (rev)
2519          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2520          *
2521          * @return array of errors, each error formatted as
2522          *   array(messagekey, param1, param2, ...).
2523          * On success, the array is empty.  This array can also be passed to
2524          * OutputPage::showPermissionsErrorPage().
2525          */
2526         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2527                 global $wgUser;
2528                 $resultDetails = null;
2529
2530                 # Check permissions
2531                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2532                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2533                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2534
2535                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2536                         $errors[] = array( 'sessionfailure' );
2537
2538                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2539                         $errors[] = array( 'actionthrottledtext' );
2540                 }
2541                 # If there were errors, bail out now
2542                 if( !empty( $errors ) )
2543                         return $errors;
2544
2545                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2546         }
2547
2548         /**
2549          * Backend implementation of doRollback(), please refer there for parameter
2550          * and return value documentation
2551          *
2552          * NOTE: This function does NOT check ANY permissions, it just commits the
2553          * rollback to the DB Therefore, you should only call this function direct-
2554          * ly if you want to use custom permissions checks. If you don't, use
2555          * doRollback() instead.
2556          */
2557         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2558                 global $wgUseRCPatrol, $wgUser, $wgLang;
2559                 $dbw = wfGetDB( DB_MASTER );
2560
2561                 if( wfReadOnly() ) {
2562                         return array( array( 'readonlytext' ) );
2563                 }
2564
2565                 # Get the last editor
2566                 $current = Revision::newFromTitle( $this->mTitle );
2567                 if( is_null( $current ) ) {
2568                         # Something wrong... no page?
2569                         return array(array('notanarticle'));
2570                 }
2571
2572                 $from = str_replace( '_', ' ', $fromP );
2573                 if( $from != $current->getUserText() ) {
2574                         $resultDetails = array( 'current' => $current );
2575                         return array(array('alreadyrolled',
2576                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2577                                 htmlspecialchars($fromP),
2578                                 htmlspecialchars($current->getUserText())
2579                         ));
2580                 }
2581
2582                 # Get the last edit not by this guy
2583                 $user = intval( $current->getUser() );
2584                 $user_text = $dbw->addQuotes( $current->getUserText() );
2585                 $s = $dbw->selectRow( 'revision',
2586                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2587                         array(  'rev_page' => $current->getPage(),
2588                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2589                         ), __METHOD__,
2590                         array(  'USE INDEX' => 'page_timestamp',
2591                                 'ORDER BY'  => 'rev_timestamp DESC' )
2592                         );
2593                 if( $s === false ) {
2594                         # No one else ever edited this page
2595                         return array(array('cantrollback'));
2596                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2597                         # Only admins can see this text
2598                         return array(array('notvisiblerev'));
2599                 }
2600
2601                 $set = array();
2602                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2603                         # Mark all reverted edits as bot
2604                         $set['rc_bot'] = 1;
2605                 }
2606                 if( $wgUseRCPatrol ) {
2607                         # Mark all reverted edits as patrolled
2608                         $set['rc_patrolled'] = 1;
2609                 }
2610
2611                 if( $set ) {
2612                         $dbw->update( 'recentchanges', $set,
2613                                         array( /* WHERE */
2614                                                 'rc_cur_id' => $current->getPage(),
2615                                                 'rc_user_text' => $current->getUserText(),
2616                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2617                                         ), __METHOD__
2618                                 );
2619                 }
2620
2621                 # Generate the edit summary if necessary
2622                 $target = Revision::newFromId( $s->rev_id );
2623                 if( empty( $summary ) ){
2624                         $summary = wfMsgForContent( 'revertpage' );
2625                 }
2626
2627                 # Allow the custom summary to use the same args as the default message
2628                 $args = array(
2629                         $target->getUserText(), $from, $s->rev_id,
2630                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2631                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2632                 );
2633                 $summary = wfMsgReplaceArgs( $summary, $args );
2634
2635                 # Save
2636                 $flags = EDIT_UPDATE;
2637
2638                 if( $wgUser->isAllowed('minoredit') )
2639                         $flags |= EDIT_MINOR;
2640
2641                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2642                         $flags |= EDIT_FORCE_BOT;
2643                 # Actually store the edit
2644                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2645                 if( !empty( $status->value['revision'] ) ) {
2646                         $revId = $status->value['revision']->getId();
2647                 } else {
2648                         $revId = false;
2649                 }
2650
2651                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2652
2653                 $resultDetails = array(
2654                         'summary' => $summary,
2655                         'current' => $current,
2656                         'target' => $target,
2657                         'newid' => $revId
2658                 );
2659                 return array();
2660         }
2661
2662         /**
2663          * User interface for rollback operations
2664          */
2665         public function rollback() {
2666                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2667                 $details = null;
2668
2669                 $result = $this->doRollback(
2670                         $wgRequest->getVal( 'from' ),
2671                         $wgRequest->getText( 'summary' ),
2672                         $wgRequest->getVal( 'token' ),
2673                         $wgRequest->getBool( 'bot' ),
2674                         $details
2675                 );
2676
2677                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2678                         $wgOut->rateLimited();
2679                         return;
2680                 }
2681                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2682                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2683                         $errArray = $result[0];
2684                         $errMsg = array_shift( $errArray );
2685                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2686                         if( isset( $details['current'] ) ){
2687                                 $current = $details['current'];
2688                                 if( $current->getComment() != '' ) {
2689                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2690                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2691                                 }
2692                         }
2693                         return;
2694                 }
2695                 # Display permissions errors before read-only message -- there's no
2696                 # point in misleading the user into thinking the inability to rollback
2697                 # is only temporary.
2698                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2699                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2700                         # move any 'readonlytext' error manually.
2701                         $out = array();
2702                         foreach( $result as $error ) {
2703                                 if( $error != array( 'readonlytext' ) ) {
2704                                         $out []= $error;
2705                                 }
2706                         }
2707                         $wgOut->showPermissionsErrorPage( $out );
2708                         return;
2709                 }
2710                 if( $result == array( array( 'readonlytext' ) ) ) {
2711                         $wgOut->readOnlyPage();
2712                         return;
2713                 }
2714
2715                 $current = $details['current'];
2716                 $target = $details['target'];
2717                 $newId = $details['newid'];
2718                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2719                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2720                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2721                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2722                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2723                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2724                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2725                 $wgOut->returnToMain( false, $this->mTitle );
2726
2727                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2728                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2729                         $de->showDiff( '', '' );
2730                 }
2731         }
2732
2733
2734         /**
2735          * Do standard deferred updates after page view
2736          */
2737         public function viewUpdates() {
2738                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2739                 # Don't update page view counters on views from bot users (bug 14044)
2740                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2741                         Article::incViewCount( $this->getID() );
2742                         $u = new SiteStatsUpdate( 1, 0, 0 );
2743                         array_push( $wgDeferredUpdateList, $u );
2744                 }
2745                 # Update newtalk / watchlist notification status
2746                 $wgUser->clearNotification( $this->mTitle );
2747         }
2748
2749         /**
2750          * Prepare text which is about to be saved.
2751          * Returns a stdclass with source, pst and output members
2752          */
2753         public function prepareTextForEdit( $text, $revid=null ) {
2754                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2755                         // Already prepared
2756                         return $this->mPreparedEdit;
2757                 }
2758                 global $wgParser;
2759                 $edit = (object)array();
2760                 $edit->revid = $revid;
2761                 $edit->newText = $text;
2762                 $edit->pst = $this->preSaveTransform( $text );
2763                 $options = new ParserOptions;
2764                 $options->setTidy( true );
2765                 $options->enableLimitReport();
2766                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2767                 $edit->oldText = $this->getContent();
2768                 $this->mPreparedEdit = $edit;
2769                 return $edit;
2770         }
2771
2772         /**
2773          * Do standard deferred updates after page edit.
2774          * Update links tables, site stats, search index and message cache.
2775          * Purges pages that include this page if the text was changed here.
2776          * Every 100th edit, prune the recent changes table.
2777          *
2778          * @private
2779          * @param $text New text of the article
2780          * @param $summary Edit summary
2781          * @param $minoredit Minor edit
2782          * @param $timestamp_of_pagechange Timestamp associated with the page change
2783          * @param $newid rev_id value of the new revision
2784          * @param $changed Whether or not the content actually changed
2785          */
2786         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2787                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2788
2789                 wfProfileIn( __METHOD__ );
2790
2791                 # Parse the text
2792                 # Be careful not to double-PST: $text is usually already PST-ed once
2793                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2794                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2795                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2796                 } else {
2797                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2798                         $editInfo = $this->mPreparedEdit;
2799                 }
2800
2801                 # Save it to the parser cache
2802                 if( $wgEnableParserCache ) {
2803                         $parserCache = ParserCache::singleton();
2804                         $parserCache->save( $editInfo->output, $this, $wgUser );
2805                 }
2806
2807                 # Update the links tables
2808                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2809                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2810                 $u->doUpdate();
2811
2812                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2813
2814                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2815                         if( 0 == mt_rand( 0, 99 ) ) {
2816                                 // Flush old entries from the `recentchanges` table; we do this on
2817                                 // random requests so as to avoid an increase in writes for no good reason
2818                                 global $wgRCMaxAge;
2819                                 $dbw = wfGetDB( DB_MASTER );
2820                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2821                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2822                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2823                                 $dbw->query( $sql );
2824                         }
2825                 }
2826
2827                 $id = $this->getID();
2828                 $title = $this->mTitle->getPrefixedDBkey();
2829                 $shortTitle = $this->mTitle->getDBkey();
2830
2831                 if( 0 == $id ) {
2832                         wfProfileOut( __METHOD__ );
2833                         return;
2834                 }
2835
2836                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2837                 array_push( $wgDeferredUpdateList, $u );
2838                 $u = new SearchUpdate( $id, $title, $text );
2839                 array_push( $wgDeferredUpdateList, $u );
2840
2841                 # If this is another user's talk page, update newtalk
2842                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2843                 # load of user talk pages and piss people off, nor if it's a minor edit
2844                 # by a properly-flagged bot.
2845                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2846                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2847                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2848                                 $other = User::newFromName( $shortTitle, false );
2849                                 if( !$other ) {
2850                                         wfDebug( __METHOD__.": invalid username\n" );
2851                                 } elseif( User::isIP( $shortTitle ) ) {
2852                                         // An anonymous user
2853                                         $other->setNewtalk( true );
2854                                 } elseif( $other->isLoggedIn() ) {
2855                                         $other->setNewtalk( true );
2856                                 } else {
2857                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2858                                 }
2859                         }
2860                 }
2861
2862                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2863                         $wgMessageCache->replace( $shortTitle, $text );
2864                 }
2865
2866                 wfProfileOut( __METHOD__ );
2867         }
2868
2869         /**
2870          * Perform article updates on a special page creation.
2871          *
2872          * @param $rev Revision object
2873          *
2874          * @todo This is a shitty interface function. Kill it and replace the
2875          * other shitty functions like editUpdates and such so it's not needed
2876          * anymore.
2877          */
2878         public function createUpdates( $rev ) {
2879                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2880                 $this->mTotalAdjustment = 1;
2881                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2882                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2883         }
2884
2885         /**
2886          * Generate the navigation links when browsing through an article revisions
2887          * It shows the information as:
2888          *   Revision as of \<date\>; view current revision
2889          *   \<- Previous version | Next Version -\>
2890          *
2891          * @param $oldid String: revision ID of this article revision
2892          */
2893         public function setOldSubtitle( $oldid = 0 ) {
2894                 global $wgLang, $wgOut, $wgUser;
2895
2896                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
2897                         return;
2898                 }
2899
2900                 $revision = Revision::newFromId( $oldid );
2901
2902                 $current = ( $oldid == $this->mLatest );
2903                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2904                 $sk = $wgUser->getSkin();
2905                 $lnk = $current
2906                         ? wfMsgHtml( 'currentrevisionlink' )
2907                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
2908                 $curdiff = $current
2909                         ? wfMsgHtml( 'diff' )
2910                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
2911                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2912                 $prevlink = $prev
2913                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2914                         : wfMsgHtml( 'previousrevision' );
2915                 $prevdiff = $prev
2916                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
2917                         : wfMsgHtml( 'diff' );
2918                 $nextlink = $current
2919                         ? wfMsgHtml( 'nextrevision' )
2920                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2921                 $nextdiff = $current
2922                         ? wfMsgHtml( 'diff' )
2923                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
2924
2925                 $cdel='';
2926                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2927                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2928                         if( $revision->isCurrent() ) {
2929                         // We don't handle top deleted edits too well
2930                                 $cdel = wfMsgHtml( 'rev-delundel' );
2931                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2932                         // If revision was hidden from sysops
2933                                 $cdel = wfMsgHtml( 'rev-delundel' );
2934                         } else {
2935                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2936                                         wfMsgHtml('rev-delundel'),
2937                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2938                                         '&oldid=' . urlencode( $oldid ) );
2939                                 // Bolden oversighted content
2940                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2941                                         $cdel = "<strong>$cdel</strong>";
2942                         }
2943                         $cdel = "(<small>$cdel</small>) ";
2944                 }
2945                 # Show user links if allowed to see them. Normally they
2946                 # are hidden regardless, but since we can already see the text here...
2947                 $userlinks = $sk->revUserTools( $revision, false );
2948
2949                 $m = wfMsg( 'revision-info-current' );
2950                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2951                         ? 'revision-info-current'
2952                         : 'revision-info';
2953
2954                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ), $td, $userlinks, $revision->getID() ) . "</div>\n" .
2955
2956                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgHtml( 'revision-nav', $prevdiff,
2957                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2958                 $wgOut->setSubtitle( $r );
2959         }
2960
2961         /**
2962          * This function is called right before saving the wikitext,
2963          * so we can do things like signatures and links-in-context.
2964          *
2965          * @param $text String
2966          */
2967         public function preSaveTransform( $text ) {
2968                 global $wgParser, $wgUser;
2969                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2970         }
2971
2972         /* Caching functions */
2973
2974         /**
2975          * checkLastModified returns true if it has taken care of all
2976          * output to the client that is necessary for this request.
2977          * (that is, it has sent a cached version of the page)
2978          */
2979         protected function tryFileCache() {
2980                 static $called = false;
2981                 if( $called ) {
2982                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2983                         return false;
2984                 }
2985                 $called = true;
2986                 if( $this->isFileCacheable() ) {
2987                         $cache = new HTMLFileCache( $this->mTitle );
2988                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
2989                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2990                                 $cache->loadFromFileCache();
2991                                 return true;
2992                         } else {
2993                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2994                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2995                         }
2996                 } else {
2997                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2998                 }
2999                 return false;
3000         }
3001
3002         /**
3003          * Check if the page can be cached
3004          * @return bool
3005          */
3006         public function isFileCacheable() {
3007                 $cacheable = false;
3008                 if( HTMLFileCache::useFileCache() ) {
3009                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3010                         // Extension may have reason to disable file caching on some pages.
3011                         if( $cacheable ) {
3012                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3013                         }
3014                 }
3015                 return $cacheable;
3016         }
3017
3018         /**
3019          * Loads page_touched and returns a value indicating if it should be used
3020          *
3021          */
3022         public function checkTouched() {
3023                 if( !$this->mDataLoaded ) {
3024                         $this->loadPageData();
3025                 }
3026                 return !$this->mIsRedirect;
3027         }
3028
3029         /**
3030          * Get the page_touched field
3031          */
3032         public function getTouched() {
3033                 # Ensure that page data has been loaded
3034                 if( !$this->mDataLoaded ) {
3035                         $this->loadPageData();
3036                 }
3037                 return $this->mTouched;
3038         }
3039
3040         /**
3041          * Get the page_latest field
3042          */
3043         public function getLatest() {
3044                 if( !$this->mDataLoaded ) {
3045                         $this->loadPageData();
3046                 }
3047                 return $this->mLatest;
3048         }
3049
3050         /**
3051          * Edit an article without doing all that other stuff
3052          * The article must already exist; link tables etc
3053          * are not updated, caches are not flushed.
3054          *
3055          * @param $text String: text submitted
3056          * @param $comment String: comment submitted
3057          * @param $minor Boolean: whereas it's a minor modification
3058          */
3059         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3060                 wfProfileIn( __METHOD__ );
3061
3062                 $dbw = wfGetDB( DB_MASTER );
3063                 $revision = new Revision( array(
3064                         'page'       => $this->getId(),
3065                         'text'       => $text,
3066                         'comment'    => $comment,
3067                         'minor_edit' => $minor ? 1 : 0,
3068                         ) );
3069                 $revision->insertOn( $dbw );
3070                 $this->updateRevisionOn( $dbw, $revision );
3071
3072                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3073
3074                 wfProfileOut( __METHOD__ );
3075         }
3076
3077         /**
3078          * Used to increment the view counter
3079          *
3080          * @param $id Integer: article id
3081          */
3082         public static function incViewCount( $id ) {
3083                 $id = intval( $id );
3084                 global $wgHitcounterUpdateFreq, $wgDBtype;
3085
3086                 $dbw = wfGetDB( DB_MASTER );
3087                 $pageTable = $dbw->tableName( 'page' );
3088                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3089                 $acchitsTable = $dbw->tableName( 'acchits' );
3090
3091                 if( $wgHitcounterUpdateFreq <= 1 ) {
3092                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3093                         return;
3094                 }
3095
3096                 # Not important enough to warrant an error page in case of failure
3097                 $oldignore = $dbw->ignoreErrors( true );
3098
3099                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3100
3101                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3102                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3103                         # Most of the time (or on SQL errors), skip row count check
3104                         $dbw->ignoreErrors( $oldignore );
3105                         return;
3106                 }
3107
3108                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3109                 $row = $dbw->fetchObject( $res );
3110                 $rown = intval( $row->n );
3111                 if( $rown >= $wgHitcounterUpdateFreq ){
3112                         wfProfileIn( 'Article::incViewCount-collect' );
3113                         $old_user_abort = ignore_user_abort( true );
3114
3115                         if($wgDBtype == 'mysql')
3116                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3117                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3118                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3119                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3120                                 'GROUP BY hc_id');
3121                         $dbw->query("DELETE FROM $hitcounterTable");
3122                         if($wgDBtype == 'mysql') {
3123                                 $dbw->query('UNLOCK TABLES');
3124                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3125                                         'WHERE page_id = hc_id');
3126                         }
3127                         else {
3128                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3129                                         "FROM $acchitsTable WHERE page_id = hc_id");
3130                         }
3131                         $dbw->query("DROP TABLE $acchitsTable");
3132
3133                         ignore_user_abort( $old_user_abort );
3134                         wfProfileOut( 'Article::incViewCount-collect' );
3135                 }
3136                 $dbw->ignoreErrors( $oldignore );
3137         }
3138
3139         /**#@+
3140          * The onArticle*() functions are supposed to be a kind of hooks
3141          * which should be called whenever any of the specified actions
3142          * are done.
3143          *
3144          * This is a good place to put code to clear caches, for instance.
3145          *
3146          * This is called on page move and undelete, as well as edit
3147          *
3148          * @param $title a title object
3149          */
3150
3151         public static function onArticleCreate( $title ) {
3152                 # Update existence markers on article/talk tabs...
3153                 if( $title->isTalkPage() ) {
3154                         $other = $title->getSubjectPage();
3155                 } else {
3156                         $other = $title->getTalkPage();
3157                 }
3158                 $other->invalidateCache();
3159                 $other->purgeSquid();
3160
3161                 $title->touchLinks();
3162                 $title->purgeSquid();
3163                 $title->deleteTitleProtection();
3164         }
3165
3166         public static function onArticleDelete( $title ) {
3167                 global $wgMessageCache;
3168                 # Update existence markers on article/talk tabs...
3169                 if( $title->isTalkPage() ) {
3170                         $other = $title->getSubjectPage();
3171                 } else {
3172                         $other = $title->getTalkPage();
3173                 }
3174                 $other->invalidateCache();
3175                 $other->purgeSquid();
3176
3177                 $title->touchLinks();
3178                 $title->purgeSquid();
3179
3180                 # File cache
3181                 HTMLFileCache::clearFileCache( $title );
3182
3183                 # Messages
3184                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3185                         $wgMessageCache->replace( $title->getDBkey(), false );
3186                 }
3187                 # Images
3188                 if( $title->getNamespace() == NS_FILE ) {
3189                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3190                         $update->doUpdate();
3191                 }
3192                 # User talk pages
3193                 if( $title->getNamespace() == NS_USER_TALK ) {
3194                         $user = User::newFromName( $title->getText(), false );
3195                         $user->setNewtalk( false );
3196                 }
3197         }
3198
3199         /**
3200          * Purge caches on page update etc
3201          */
3202         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3203                 global $wgDeferredUpdateList;
3204
3205                 // Invalidate caches of articles which include this page
3206                 if( $transclusions !== 'skiptransclusions' )
3207                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3208
3209                 // Invalidate the caches of all pages which redirect here
3210                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3211
3212                 # Purge squid for this page only
3213                 $title->purgeSquid();
3214
3215                 # Clear file cache for this page only
3216                 HTMLFileCache::clearFileCache( $title );
3217         }
3218
3219         /**#@-*/
3220
3221         /**
3222          * Overriden by ImagePage class, only present here to avoid a fatal error
3223          * Called for ?action=revert
3224          */
3225         public function revert() {
3226                 global $wgOut;
3227                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3228         }
3229
3230         /**
3231          * Info about this page
3232          * Called for ?action=info when $wgAllowPageInfo is on.
3233          */
3234         public function info() {
3235                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3236
3237                 if( !$wgAllowPageInfo ) {
3238                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3239                         return;
3240                 }
3241
3242                 $page = $this->mTitle->getSubjectPage();
3243
3244                 $wgOut->setPagetitle( $page->getPrefixedText() );
3245                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3246                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3247
3248                 if( !$this->mTitle->exists() ) {
3249                         $wgOut->addHTML( '<div class="noarticletext">' );
3250                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3251                                 // This doesn't quite make sense; the user is asking for
3252                                 // information about the _page_, not the message... -- RC
3253                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3254                         } else {
3255                                 $msg = $wgUser->isLoggedIn()
3256                                         ? 'noarticletext'
3257                                         : 'noarticletextanon';
3258                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3259                         }
3260                         $wgOut->addHTML( '</div>' );
3261                 } else {
3262                         $dbr = wfGetDB( DB_SLAVE );
3263                         $wl_clause = array(
3264                                 'wl_title'     => $page->getDBkey(),
3265                                 'wl_namespace' => $page->getNamespace() );
3266                         $numwatchers = $dbr->selectField(
3267                                 'watchlist',
3268                                 'COUNT(*)',
3269                                 $wl_clause,
3270                                 __METHOD__,
3271                                 $this->getSelectOptions() );
3272
3273                         $pageInfo = $this->pageCountInfo( $page );
3274                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3275
3276                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3277                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3278                         if( $talkInfo ) {
3279                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3280                         }
3281                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3282                         if( $talkInfo ) {
3283                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3284                         }
3285                         $wgOut->addHTML( '</ul>' );
3286                 }
3287         }
3288
3289         /**
3290          * Return the total number of edits and number of unique editors
3291          * on a given page. If page does not exist, returns false.
3292          *
3293          * @param $title Title object
3294          * @return array
3295          */
3296         protected function pageCountInfo( $title ) {
3297                 $id = $title->getArticleId();
3298                 if( $id == 0 ) {
3299                         return false;
3300                 }
3301                 $dbr = wfGetDB( DB_SLAVE );
3302                 $rev_clause = array( 'rev_page' => $id );
3303                 $edits = $dbr->selectField(
3304                         'revision',
3305                         'COUNT(rev_page)',
3306                         $rev_clause,
3307                         __METHOD__,
3308                         $this->getSelectOptions()
3309                 );
3310                 $authors = $dbr->selectField(
3311                         'revision',
3312                         'COUNT(DISTINCT rev_user_text)',
3313                         $rev_clause,
3314                         __METHOD__,
3315                         $this->getSelectOptions()
3316                 );
3317                 return array( 'edits' => $edits, 'authors' => $authors );
3318         }
3319
3320         /**
3321          * Return a list of templates used by this article.
3322          * Uses the templatelinks table
3323          *
3324          * @return Array of Title objects
3325          */
3326         public function getUsedTemplates() {
3327                 $result = array();
3328                 $id = $this->mTitle->getArticleID();
3329                 if( $id == 0 ) {
3330                         return array();
3331                 }
3332                 $dbr = wfGetDB( DB_SLAVE );
3333                 $res = $dbr->select( array( 'templatelinks' ),
3334                         array( 'tl_namespace', 'tl_title' ),
3335                         array( 'tl_from' => $id ),
3336                         __METHOD__ );
3337                 if( $res !== false ) {
3338                         foreach( $res as $row ) {
3339                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3340                         }
3341                 }
3342                 $dbr->freeResult( $res );
3343                 return $result;
3344         }
3345
3346         /**
3347          * Returns a list of hidden categories this page is a member of.
3348          * Uses the page_props and categorylinks tables.
3349          *
3350          * @return Array of Title objects
3351          */
3352         public function getHiddenCategories() {
3353                 $result = array();
3354                 $id = $this->mTitle->getArticleID();
3355                 if( $id == 0 ) {
3356                         return array();
3357                 }
3358                 $dbr = wfGetDB( DB_SLAVE );
3359                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3360                         array( 'cl_to' ),
3361                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3362                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3363                         __METHOD__ );
3364                 if( $res !== false ) {
3365                         foreach( $res as $row ) {
3366                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3367                         }
3368                 }
3369                 $dbr->freeResult( $res );
3370                 return $result;
3371         }
3372
3373         /**
3374         * Return an applicable autosummary if one exists for the given edit.
3375         * @param $oldtext String: the previous text of the page.
3376         * @param $newtext String: The submitted text of the page.
3377         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3378         * @return string An appropriate autosummary, or an empty string.
3379         */
3380         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3381                 # Decide what kind of autosummary is needed.
3382
3383                 # Redirect autosummaries
3384                 $ot = Title::newFromRedirect( $oldtext );
3385                 $rt = Title::newFromRedirect( $newtext );
3386                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3387                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3388                 }
3389
3390                 # New page autosummaries
3391                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3392                         # If they're making a new article, give its text, truncated, in the summary.
3393                         global $wgContLang;
3394                         $truncatedtext = $wgContLang->truncate(
3395                                 str_replace("\n", ' ', $newtext),
3396                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3397                                 '...' );
3398                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3399                 }
3400
3401                 # Blanking autosummaries
3402                 if( $oldtext != '' && $newtext == '' ) {
3403                         return wfMsgForContent( 'autosumm-blank' );
3404                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3405                         # Removing more than 90% of the article
3406                         global $wgContLang;
3407                         $truncatedtext = $wgContLang->truncate(
3408                                 $newtext,
3409                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3410                                 '...'
3411                         );
3412                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3413                 }
3414
3415                 # If we reach this point, there's no applicable autosummary for our case, so our
3416                 # autosummary is empty.
3417                 return '';
3418         }
3419
3420         /**
3421          * Add the primary page-view wikitext to the output buffer
3422          * Saves the text into the parser cache if possible.
3423          * Updates templatelinks if it is out of date.
3424          *
3425          * @param $text String
3426          * @param $cache Boolean
3427          */
3428         public function outputWikiText( $text, $cache = true ) {
3429                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3430
3431                 $popts = $wgOut->parserOptions();
3432                 $popts->setTidy(true);
3433                 $popts->enableLimitReport();
3434                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3435                         $popts, true, true, $this->getRevIdFetched() );
3436                 $popts->setTidy(false);
3437                 $popts->enableLimitReport( false );
3438                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3439                         $parserCache = ParserCache::singleton();
3440                         $parserCache->save( $parserOutput, $this, $wgUser );
3441                 }
3442                 // Make sure file cache is not used on uncacheable content.
3443                 // Output that has magic words in it can still use the parser cache
3444                 // (if enabled), though it will generally expire sooner.
3445                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3446                         $wgUseFileCache = false;
3447                 }
3448
3449                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3450                         // templatelinks table may have become out of sync,
3451                         // especially if using variable-based transclusions.
3452                         // For paranoia, check if things have changed and if
3453                         // so apply updates to the database. This will ensure
3454                         // that cascaded protections apply as soon as the changes
3455                         // are visible.
3456
3457                         # Get templates from templatelinks
3458                         $id = $this->mTitle->getArticleID();
3459
3460                         $tlTemplates = array();
3461
3462                         $dbr = wfGetDB( DB_SLAVE );
3463                         $res = $dbr->select( array( 'templatelinks' ),
3464                                 array( 'tl_namespace', 'tl_title' ),
3465                                 array( 'tl_from' => $id ),
3466                                 __METHOD__ );
3467
3468                         global $wgContLang;
3469
3470                         if( $res !== false ) {
3471                                 foreach( $res as $row ) {
3472                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3473                                 }
3474                         }
3475
3476                         # Get templates from parser output.
3477                         $poTemplates_allns = $parserOutput->getTemplates();
3478
3479                         $poTemplates = array ();
3480                         foreach ( $poTemplates_allns as $ns_templates ) {
3481                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3482                         }
3483
3484                         # Get the diff
3485                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3486
3487                         if( count( $templates_diff ) > 0 ) {
3488                                 # Whee, link updates time.
3489                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3490                                 $u->doUpdate();
3491                         }
3492                 }
3493
3494                 $wgOut->addParserOutput( $parserOutput );
3495         }
3496
3497         /**
3498          * Update all the appropriate counts in the category table, given that
3499          * we've added the categories $added and deleted the categories $deleted.
3500          *
3501          * @param $added array   The names of categories that were added
3502          * @param $deleted array The names of categories that were deleted
3503          * @return null
3504          */
3505         public function updateCategoryCounts( $added, $deleted ) {
3506                 $ns = $this->mTitle->getNamespace();
3507                 $dbw = wfGetDB( DB_MASTER );
3508
3509                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3510                 # exist, we might legitimately not create it, but it's simpler to just
3511                 # create it and then give it a negative value, since the value is bogus
3512                 # anyway.
3513                 #
3514                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3515                 $insertCats = array_merge( $added, $deleted );
3516                 if( !$insertCats ) {
3517                         # Okay, nothing to do
3518                         return;
3519                 }
3520                 $insertRows = array();
3521                 foreach( $insertCats as $cat ) {
3522                         $insertRows[] = array( 'cat_title' => $cat );
3523                 }
3524                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3525
3526                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3527                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3528                 if( $ns == NS_CATEGORY ) {
3529                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3530                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3531                 } elseif( $ns == NS_FILE ) {
3532                         $addFields[]    = 'cat_files = cat_files + 1';
3533                         $removeFields[] = 'cat_files = cat_files - 1';
3534                 }
3535
3536                 if( $added ) {
3537                         $dbw->update(
3538                                 'category',
3539                                 $addFields,
3540                                 array( 'cat_title' => $added ),
3541                                 __METHOD__
3542                         );
3543                 }
3544                 if( $deleted ) {
3545                         $dbw->update(
3546                                 'category',
3547                                 $removeFields,
3548                                 array( 'cat_title' => $deleted ),
3549                                 __METHOD__
3550                         );
3551                 }
3552         }
3553 }