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                                 $wgOut->disable();
 850                                 wfProfileOut( __METHOD__ );
 851                                 return;
 852                         }
 853
 854                         # For ?curid=x urls, disallow indexing
 855                         if( $wgRequest->getInt('curid') )
 856                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 857
 858                         # We're looking at an old revision
 859                         if( !empty( $oldid ) ) {
 860                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 861                                 if( is_null( $this->mRevision ) ) {
 862                                         // FIXME: This would be a nice place to load the 'no such page' text.
 863                                 } else {
 864                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 865                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 866                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 867                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 868                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 869                                                         wfProfileOut( __METHOD__ );
 870                                                         return;
 871                                                 } else {
 872                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 873                                                         // and we are allowed to see...
 874                                                 }
 875                                         }
 876                                 }
 877                         }
 878
 879                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 880
 881                          // Pages containing custom CSS or JavaScript get special treatment
 882                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 883                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 884                                 // Give hooks a chance to customise the output
 885                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 886                                         // Wrap the whole lot in a <pre> and don't parse
 887                                         $m = array();
 888                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 889                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 890                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 891                                         $wgOut->addHTML( "\n</pre>\n" );
 892                                 }
 893                         } else if( $rt = Title::newFromRedirect( $text ) ) {
 894                                 # Don't append the subtitle if this was an old revision
 895                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 896                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 897                                 $wgOut->addParserOutputNoText( $parseout );
 898                         } else if( $pcache ) {
 899                                 # Display content and save to parser cache
 900                                 $this->outputWikiText( $text );
 901                         } else {
 902                                 # Display content, don't attempt to save to parser cache
 903                                 # Don't show section-edit links on old revisions... this way lies madness.
 904                                 if( !$this->isCurrent() ) {
 905                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 906                                 }
 907                                 # Display content and don't save to parser cache
 908                                 # With timing hack -- TS 2006-07-26
 909                                 $time = -wfTime();
 910                                 $this->outputWikiText( $text, false );
 911                                 $time += wfTime();
 912
 913                                 # Timing hack
 914                                 if( $time > 3 ) {
 915                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 916                                                 $this->mTitle->getPrefixedDBkey()));
 917                                 }
 918
 919                                 if( !$this->isCurrent() ) {
 920                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 921                                 }
 922                         }
 923                 }
 924                 /* title may have been set from the cache */
 925                 $t = $wgOut->getPageTitle();
 926                 if( empty( $t ) ) {
 927                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 928
 929                         # For the main page, overwrite the <title> element with the con-
 930                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 931                         # that's not empty).
 932                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 933                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 934                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 935                         }
 936                 }
 937
 938                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 939                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 940                         $wgOut->addWikiMsg('anontalkpagetext');
 941                 }
 942
 943                 # If we have been passed an &rcid= parameter, we want to give the user a
 944                 # chance to mark this new article as patrolled.
 945                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->userCan('patrol') ) {
 946                         $wgOut->addHTML(
 947                                 "<div class='patrollink'>" .
 948                                         wfMsgHtml( 'markaspatrolledlink',
 949                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 950                                                 "action=markpatrolled&rcid=$rcid" )
 951                                         ) .
 952                                 '</div>'
 953                          );
 954                 }
 955
 956                 # Trackbacks
 957                 if( $wgUseTrackbacks ) {
 958                         $this->addTrackbacks();
 959                 }
 960
 961                 $this->viewUpdates();
 962                 wfProfileOut( __METHOD__ );
 963         }
 964
 965         protected function showDeletionLog() {
 966                 global $wgUser, $wgOut;
 967                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 968                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 969                 if( $pager->getNumRows() > 0 ) {
 970                         $pager->mLimit = 10;
 971                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
 972                         $wgOut->addWikiMsg( 'deleted-notice' );
 973                         $wgOut->addHTML(
 974                                 $loglist->beginLogEventsList() .
 975                                 $pager->getBody() .
 976                                 $loglist->endLogEventsList()
 977                         );
 978                         if( $pager->getNumRows() > 10 ) {
 979                                 $wgOut->addHTML( $wgUser->getSkin()->link(
 980                                         SpecialPage::getTitleFor( 'Log' ),
 981                                         wfMsgHtml( 'deletelog-fulllog' ),
 982                                         array(),
 983                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
 984                                 ) );
 985                         }
 986                         $wgOut->addHTML( '</div>' );
 987                 }
 988         }
 989
 990         /*
 991         * Should the parser cache be used?
 992         */
 993         protected function useParserCache( $oldid ) {
 994                 global $wgUser, $wgEnableParserCache;
 995
 996                 return $wgEnableParserCache
 997                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 998                         && $this->exists()
 999                         && empty( $oldid )
1000                         && !$this->mTitle->isCssOrJsPage()
1001                         && !$this->mTitle->isCssJsSubpage();
1002         }
1003
1004         /**
1005          * View redirect
1006          * @param $target Title object of destination to redirect
1007          * @param $appendSubtitle Boolean [optional]
1008          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1009          */
1010         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1011                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1012                 # Display redirect
1013                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1014                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
1015
1016                 if( $appendSubtitle ) {
1017                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1018                 }
1019                 $sk = $wgUser->getSkin();
1020                 if( $forceKnown ) {
1021                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1022                 } else {
1023                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
1024                 }
1025                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1026                         '<span class="redirectText">'.$link.'</span>';
1027
1028         }
1029
1030         public function addTrackbacks() {
1031                 global $wgOut, $wgUser;
1032                 $dbr = wfGetDB( DB_SLAVE );
1033                 $tbs = $dbr->select( 'trackbacks',
1034                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1035                         array('tb_page' => $this->getID() )
1036                 );
1037                 if( !$dbr->numRows($tbs) ) return;
1038
1039                 $tbtext = "";
1040                 while( $o = $dbr->fetchObject($tbs) ) {
1041                         $rmvtxt = "";
1042                         if( $wgUser->isAllowed( 'trackback' ) ) {
1043                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1044                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1045                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1046                         }
1047                         $tbtext .= "\n";
1048                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1049                                         $o->tb_title,
1050                                         $o->tb_url,
1051                                         $o->tb_ex,
1052                                         $o->tb_name,
1053                                         $rmvtxt);
1054                 }
1055                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1056                 $this->mTitle->invalidateCache();
1057         }
1058
1059         public function deletetrackback() {
1060                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1061                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1062                         $wgOut->addWikiMsg( 'sessionfailure' );
1063                         return;
1064                 }
1065
1066                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1067                 if( count($permission_errors) ) {
1068                         $wgOut->showPermissionsErrorPage( $permission_errors );
1069                         return;
1070                 }
1071
1072                 $db = wfGetDB( DB_MASTER );
1073                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1074
1075                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1076                 $this->mTitle->invalidateCache();
1077         }
1078
1079         public function render() {
1080                 global $wgOut;
1081                 $wgOut->setArticleBodyOnly(true);
1082                 $this->view();
1083         }
1084
1085         /**
1086          * Handle action=purge
1087          */
1088         public function purge() {
1089                 global $wgUser, $wgRequest, $wgOut;
1090                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1091                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1092                                 $this->doPurge();
1093                                 $this->view();
1094                         }
1095                 } else {
1096                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1097                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1098                         $form = "<form method=\"post\" action=\"$action\">\n" .
1099                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1100                                         "</form>\n";
1101                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1102                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1103                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1104                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1105                         $wgOut->addHTML( $top . $form . $bottom );
1106                 }
1107         }
1108
1109         /**
1110          * Perform the actions of a page purging
1111          */
1112         public function doPurge() {
1113                 global $wgUseSquid;
1114                 // Invalidate the cache
1115                 $this->mTitle->invalidateCache();
1116
1117                 if( $wgUseSquid ) {
1118                         // Commit the transaction before the purge is sent
1119                         $dbw = wfGetDB( DB_MASTER );
1120                         $dbw->immediateCommit();
1121
1122                         // Send purge
1123                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1124                         $update->doUpdate();
1125                 }
1126                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1127                         global $wgMessageCache;
1128                         if( $this->getID() == 0 ) {
1129                                 $text = false;
1130                         } else {
1131                                 $text = $this->getContent();
1132                         }
1133                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1134                 }
1135         }
1136
1137         /**
1138          * Insert a new empty page record for this article.
1139          * This *must* be followed up by creating a revision
1140          * and running $this->updateToLatest( $rev_id );
1141          * or else the record will be left in a funky state.
1142          * Best if all done inside a transaction.
1143          *
1144          * @param $dbw Database
1145          * @return int The newly created page_id key, or false if the title already existed
1146          * @private
1147          */
1148         public function insertOn( $dbw ) {
1149                 wfProfileIn( __METHOD__ );
1150
1151                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1152                 $dbw->insert( 'page', array(
1153                         'page_id'           => $page_id,
1154                         'page_namespace'    => $this->mTitle->getNamespace(),
1155                         'page_title'        => $this->mTitle->getDBkey(),
1156                         'page_counter'      => 0,
1157                         'page_restrictions' => '',
1158                         'page_is_redirect'  => 0, # Will set this shortly...
1159                         'page_is_new'       => 1,
1160                         'page_random'       => wfRandom(),
1161                         'page_touched'      => $dbw->timestamp(),
1162                         'page_latest'       => 0, # Fill this in shortly...
1163                         'page_len'          => 0, # Fill this in shortly...
1164                 ), __METHOD__, 'IGNORE' );
1165
1166                 $affected = $dbw->affectedRows();
1167                 if( $affected ) {
1168                         $newid = $dbw->insertId();
1169                         $this->mTitle->resetArticleId( $newid );
1170                 }
1171                 wfProfileOut( __METHOD__ );
1172                 return $affected ? $newid : false;
1173         }
1174
1175         /**
1176          * Update the page record to point to a newly saved revision.
1177          *
1178          * @param $dbw Database object
1179          * @param $revision Revision: For ID number, and text used to set
1180                             length and redirect status fields
1181          * @param $lastRevision Integer: if given, will not overwrite the page field
1182          *                      when different from the currently set value.
1183          *                      Giving 0 indicates the new page flag should be set
1184          *                      on.
1185          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1186          *                                                       removing rows in redirect table.
1187          * @return bool true on success, false on failure
1188          * @private
1189          */
1190         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1191                 wfProfileIn( __METHOD__ );
1192
1193                 $text = $revision->getText();
1194                 $rt = Title::newFromRedirect( $text );
1195
1196                 $conditions = array( 'page_id' => $this->getId() );
1197                 if( !is_null( $lastRevision ) ) {
1198                         # An extra check against threads stepping on each other
1199                         $conditions['page_latest'] = $lastRevision;
1200                 }
1201
1202                 $dbw->update( 'page',
1203                         array( /* SET */
1204                                 'page_latest'      => $revision->getId(),
1205                                 'page_touched'     => $dbw->timestamp(),
1206                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1207                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1208                                 'page_len'         => strlen( $text ),
1209                         ),
1210                         $conditions,
1211                         __METHOD__ );
1212
1213                 $result = $dbw->affectedRows() != 0;
1214                 if( $result ) {
1215                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1216                 }
1217
1218                 wfProfileOut( __METHOD__ );
1219                 return $result;
1220         }
1221
1222         /**
1223          * Add row to the redirect table if this is a redirect, remove otherwise.
1224          *
1225          * @param $dbw Database
1226          * @param $redirectTitle a title object pointing to the redirect target,
1227          *                                               or NULL if this is not a redirect
1228          * @param $lastRevIsRedirect If given, will optimize adding and
1229          *                                                       removing rows in redirect table.
1230          * @return bool true on success, false on failure
1231          * @private
1232          */
1233         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1234                 // Always update redirects (target link might have changed)
1235                 // Update/Insert if we don't know if the last revision was a redirect or not
1236                 // Delete if changing from redirect to non-redirect
1237                 $isRedirect = !is_null($redirectTitle);
1238                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1239                         wfProfileIn( __METHOD__ );
1240                         if( $isRedirect ) {
1241                                 // This title is a redirect, Add/Update row in the redirect table
1242                                 $set = array( /* SET */
1243                                         'rd_namespace' => $redirectTitle->getNamespace(),
1244                                         'rd_title'     => $redirectTitle->getDBkey(),
1245                                         'rd_from'      => $this->getId(),
1246                                 );
1247                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1248                         } else {
1249                                 // This is not a redirect, remove row from redirect table
1250                                 $where = array( 'rd_from' => $this->getId() );
1251                                 $dbw->delete( 'redirect', $where, __METHOD__);
1252                         }
1253                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1254                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1255                         }
1256                         wfProfileOut( __METHOD__ );
1257                         return ( $dbw->affectedRows() != 0 );
1258                 }
1259                 return true;
1260         }
1261
1262         /**
1263          * If the given revision is newer than the currently set page_latest,
1264          * update the page record. Otherwise, do nothing.
1265          *
1266          * @param $dbw Database object
1267          * @param $revision Revision object
1268          */
1269         public function updateIfNewerOn( &$dbw, $revision ) {
1270                 wfProfileIn( __METHOD__ );
1271                 $row = $dbw->selectRow(
1272                         array( 'revision', 'page' ),
1273                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1274                         array(
1275                                 'page_id' => $this->getId(),
1276                                 'page_latest=rev_id' ),
1277                         __METHOD__ );
1278                 if( $row ) {
1279                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1280                                 wfProfileOut( __METHOD__ );
1281                                 return false;
1282                         }
1283                         $prev = $row->rev_id;
1284                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1285                 } else {
1286                         # No or missing previous revision; mark the page as new
1287                         $prev = 0;
1288                         $lastRevIsRedirect = null;
1289                 }
1290                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1291                 wfProfileOut( __METHOD__ );
1292                 return $ret;
1293         }
1294
1295         /**
1296          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1297          * @return string Complete article text, or null if error
1298          */
1299         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1300                 wfProfileIn( __METHOD__ );
1301                 if( strval( $section ) == '' ) {
1302                         // Whole-page edit; let the whole text through
1303                 } else {
1304                         if( is_null($edittime) ) {
1305                                 $rev = Revision::newFromTitle( $this->mTitle );
1306                         } else {
1307                                 $dbw = wfGetDB( DB_MASTER );
1308                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1309                         }
1310                         if( !$rev ) {
1311                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1312                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1313                                 return null;
1314                         }
1315                         $oldtext = $rev->getText();
1316
1317                         if( $section == 'new' ) {
1318                                 # Inserting a new section
1319                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1320                                 $text = strlen( trim( $oldtext ) ) > 0
1321                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1322                                                 : "{$subject}{$text}";
1323                         } else {
1324                                 # Replacing an existing section; roll out the big guns
1325                                 global $wgParser;
1326                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1327                         }
1328                 }
1329                 wfProfileOut( __METHOD__ );
1330                 return $text;
1331         }
1332
1333         /**
1334          * @deprecated use Article::doEdit()
1335          */
1336         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1337                 wfDeprecated( __METHOD__ );
1338                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1339                         ( $isminor ? EDIT_MINOR : 0 ) |
1340                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1341                         ( $bot ? EDIT_FORCE_BOT : 0 );
1342
1343                 # If this is a comment, add the summary as headline
1344                 if( $comment && $summary != "" ) {
1345                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1346                 }
1347
1348                 $this->doEdit( $text, $summary, $flags );
1349
1350                 $dbw = wfGetDB( DB_MASTER );
1351                 if($watchthis) {
1352                         if(!$this->mTitle->userIsWatching()) {
1353                                 $dbw->begin();
1354                                 $this->doWatch();
1355                                 $dbw->commit();
1356                         }
1357                 } else {
1358                         if( $this->mTitle->userIsWatching() ) {
1359                                 $dbw->begin();
1360                                 $this->doUnwatch();
1361                                 $dbw->commit();
1362                         }
1363                 }
1364                 $this->doRedirect( $this->isRedirect( $text ) );
1365         }
1366
1367         /**
1368          * @deprecated use Article::doEdit()
1369          */
1370         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1371                 wfDeprecated( __METHOD__ );
1372                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1373                         ( $minor ? EDIT_MINOR : 0 ) |
1374                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1375
1376                 $status = $this->doEdit( $text, $summary, $flags );
1377                 if( !$status->isOK() ) {
1378                         return false;
1379                 }
1380
1381                 $dbw = wfGetDB( DB_MASTER );
1382                 if( $watchthis ) {
1383                         if(!$this->mTitle->userIsWatching()) {
1384                                 $dbw->begin();
1385                                 $this->doWatch();
1386                                 $dbw->commit();
1387                         }
1388                 } else {
1389                         if( $this->mTitle->userIsWatching() ) {
1390                                 $dbw->begin();
1391                                 $this->doUnwatch();
1392                                 $dbw->commit();
1393                         }
1394                 }
1395
1396                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1397                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1398
1399                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1400                 return true;
1401         }
1402
1403         /**
1404          * Article::doEdit()
1405          *
1406          * Change an existing article or create a new article. Updates RC and all necessary caches,
1407          * optionally via the deferred update array.
1408          *
1409          * $wgUser must be set before calling this function.
1410          *
1411          * @param $text String: new text
1412          * @param $summary String: edit summary
1413          * @param $flags Integer bitfield:
1414          *      EDIT_NEW
1415          *          Article is known or assumed to be non-existent, create a new one
1416          *      EDIT_UPDATE
1417          *          Article is known or assumed to be pre-existing, update it
1418          *      EDIT_MINOR
1419          *          Mark this edit minor, if the user is allowed to do so
1420          *      EDIT_SUPPRESS_RC
1421          *          Do not log the change in recentchanges
1422          *      EDIT_FORCE_BOT
1423          *          Mark the edit a "bot" edit regardless of user rights
1424          *      EDIT_DEFER_UPDATES
1425          *          Defer some of the updates until the end of index.php
1426          *      EDIT_AUTOSUMMARY
1427          *          Fill in blank summaries with generated text where possible
1428          *
1429          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1430          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1431          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1432          * edit-already-exists error will be returned. These two conditions are also possible with
1433          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1434          *
1435          * @param $baseRevId the revision ID this edit was based off, if any
1436          * @param $user Optional user object, $wgUser will be used if not passed
1437          *
1438          * @return Status object. Possible errors:
1439          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1440          *     edit-gone-missing:       In update mode, but the article didn't exist
1441          *     edit-conflict:           In update mode, the article changed unexpectedly
1442          *     edit-no-change:          Warning that the text was the same as before
1443          *     edit-already-exists:     In creation mode, but the article already exists
1444          *
1445          *  Extensions may define additional errors.
1446          *
1447          *  $return->value will contain an associative array with members as follows:
1448          *     new:                     Boolean indicating if the function attempted to create a new article
1449          *     revision:                The revision object for the inserted revision, or null
1450          *
1451          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1452          */
1453         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1454                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1455
1456                 # Low-level sanity check
1457                 if( $this->mTitle->getText() == '' ) {
1458                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1459                 }
1460
1461                 wfProfileIn( __METHOD__ );
1462
1463                 $user = is_null($user) ? $wgUser : $user;
1464                 $status = Status::newGood( array() );
1465
1466                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1467                 $this->loadPageData();
1468
1469                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1470                         $aid = $this->mTitle->getArticleID();
1471                         if( $aid ) {
1472                                 $flags |= EDIT_UPDATE;
1473                         } else {
1474                                 $flags |= EDIT_NEW;
1475                         }
1476                 }
1477
1478                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1479                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1480                 {
1481                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1482                         wfProfileOut( __METHOD__ );
1483                         if( $status->isOK() ) {
1484                                 $status->fatal( 'edit-hook-aborted');
1485                         }
1486                         return $status;
1487                 }
1488
1489                 # Silently ignore EDIT_MINOR if not allowed
1490                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1491                 $bot = $flags & EDIT_FORCE_BOT;
1492
1493                 $oldtext = $this->getContent();
1494                 $oldsize = strlen( $oldtext );
1495
1496                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1497                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1498                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1499                 }
1500
1501                 $editInfo = $this->prepareTextForEdit( $text );
1502                 $text = $editInfo->pst;
1503                 $newsize = strlen( $text );
1504
1505                 $dbw = wfGetDB( DB_MASTER );
1506                 $now = wfTimestampNow();
1507
1508                 if( $flags & EDIT_UPDATE ) {
1509                         # Update article, but only if changed.
1510                         $status->value['new'] = false;
1511                         # Make sure the revision is either completely inserted or not inserted at all
1512                         if( !$wgDBtransactions ) {
1513                                 $userAbort = ignore_user_abort( true );
1514                         }
1515
1516                         $revisionId = 0;
1517
1518                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1519
1520                         if( $changed ) {
1521                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1522                                   - (int)$this->isCountable( $oldtext );
1523                                 $this->mTotalAdjustment = 0;
1524
1525                                 if( !$this->mLatest ) {
1526                                         # Article gone missing
1527                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1528                                         $status->fatal( 'edit-gone-missing' );
1529                                         wfProfileOut( __METHOD__ );
1530                                         return $status;
1531                                 }
1532
1533                                 $revision = new Revision( array(
1534                                         'page'       => $this->getId(),
1535                                         'comment'    => $summary,
1536                                         'minor_edit' => $isminor,
1537                                         'text'       => $text,
1538                                         'parent_id'  => $this->mLatest,
1539                                         'user'       => $user->getId(),
1540                                         'user_text'  => $user->getName(),
1541                                         ) );
1542
1543                                 $dbw->begin();
1544                                 $revisionId = $revision->insertOn( $dbw );
1545
1546                                 # Update page
1547                                 #
1548                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1549                                 # during the course of this function. This makes sure that EditPage can detect
1550                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1551                                 # before this function is called. A previous function used a separate query, this
1552                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1553                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1554
1555                                 if( !$ok ) {
1556                                         /* Belated edit conflict! Run away!! */
1557                                         $status->fatal( 'edit-conflict' );
1558                                         # Delete the invalid revision if the DB is not transactional
1559                                         if( !$wgDBtransactions ) {
1560                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1561                                         }
1562                                         $revisionId = 0;
1563                                         $dbw->rollback();
1564                                 } else {
1565                                         global $wgUseRCPatrol;
1566                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1567                                         # Update recentchanges
1568                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1569                                                 # Mark as patrolled if the user can do so
1570                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1571                                                 # Add RC row to the DB
1572                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1573                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1574                                                         $revisionId, $patrolled
1575                                                 );
1576                                                 # Log auto-patrolled edits
1577                                                 if( $patrolled ) {
1578                                                         PatrolLog::record( $rc, true );
1579                                                 }
1580                                         }
1581                                         $user->incEditCount();
1582                                         $dbw->commit();
1583                                 }
1584                         } else {
1585                                 $status->warning( 'edit-no-change' );
1586                                 $revision = null;
1587                                 // Keep the same revision ID, but do some updates on it
1588                                 $revisionId = $this->getRevIdFetched();
1589                                 // Update page_touched, this is usually implicit in the page update
1590                                 // Other cache updates are done in onArticleEdit()
1591                                 $this->mTitle->invalidateCache();
1592                         }
1593
1594                         if( !$wgDBtransactions ) {
1595                                 ignore_user_abort( $userAbort );
1596                         }
1597                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1598                         if( !$status->isOK() ) {
1599                                 wfProfileOut( __METHOD__ );
1600                                 return $status;
1601                         }
1602
1603                         # Invalidate cache of this article and all pages using this article
1604                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1605                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1606                         # Update links tables, site stats, etc.
1607                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1608                 } else {
1609                         # Create new article
1610                         $status->value['new'] = true;
1611
1612                         # Set statistics members
1613                         # We work out if it's countable after PST to avoid counter drift
1614                         # when articles are created with {{subst:}}
1615                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1616                         $this->mTotalAdjustment = 1;
1617
1618                         $dbw->begin();
1619
1620                         # Add the page record; stake our claim on this title!
1621                         # This will return false if the article already exists
1622                         $newid = $this->insertOn( $dbw );
1623
1624                         if( $newid === false ) {
1625                                 $dbw->rollback();
1626                                 $status->fatal( 'edit-already-exists' );
1627                                 wfProfileOut( __METHOD__ );
1628                                 return $status;
1629                         }
1630
1631                         # Save the revision text...
1632                         $revision = new Revision( array(
1633                                 'page'       => $newid,
1634                                 'comment'    => $summary,
1635                                 'minor_edit' => $isminor,
1636                                 'text'       => $text,
1637                                 'user'       => $user->getId(),
1638                                 'user_text'  => $user->getName(),
1639                                 ) );
1640                         $revisionId = $revision->insertOn( $dbw );
1641
1642                         $this->mTitle->resetArticleID( $newid );
1643
1644                         # Update the page record with revision data
1645                         $this->updateRevisionOn( $dbw, $revision, 0 );
1646
1647                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1648                         # Update recentchanges
1649                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1650                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1651                                 # Mark as patrolled if the user can do so
1652                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1653                                 # Add RC row to the DB
1654                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1655                                         '', strlen($text), $revisionId, $patrolled );
1656                                 # Log auto-patrolled edits
1657                                 if( $patrolled ) {
1658                                         PatrolLog::record( $rc, true );
1659                                 }
1660                         }
1661                         $user->incEditCount();
1662                         $dbw->commit();
1663
1664                         # Update links, etc.
1665                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1666
1667                         # Clear caches
1668                         Article::onArticleCreate( $this->mTitle );
1669
1670                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1671                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1672                 }
1673
1674                 # Do updates right now unless deferral was requested
1675                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1676                         wfDoUpdates();
1677                 }
1678
1679                 // Return the new revision (or null) to the caller
1680                 $status->value['revision'] = $revision;
1681
1682                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1683                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1684
1685                 wfProfileOut( __METHOD__ );
1686                 return $status;
1687         }
1688
1689         /**
1690          * @deprecated wrapper for doRedirect
1691          */
1692         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1693                 wfDeprecated( __METHOD__ );
1694                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1695         }
1696
1697         /**
1698          * Output a redirect back to the article.
1699          * This is typically used after an edit.
1700          *
1701          * @param $noRedir Boolean: add redirect=no
1702          * @param $sectionAnchor String: section to redirect to, including "#"
1703          * @param $extraQuery String: extra query params
1704          */
1705         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1706                 global $wgOut;
1707                 if( $noRedir ) {
1708                         $query = 'redirect=no';
1709                         if( $extraQuery )
1710                                 $query .= "&$query";
1711                 } else {
1712                         $query = $extraQuery;
1713                 }
1714                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1715         }
1716
1717         /**
1718          * Mark this particular edit/page as patrolled
1719          */
1720         public function markpatrolled() {
1721                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1722                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1723
1724                 # If we haven't been given an rc_id value, we can't do anything
1725                 $rcid = (int) $wgRequest->getVal('rcid');
1726                 $rc = RecentChange::newFromId($rcid);
1727                 if( is_null($rc) ) {
1728                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1729                         return;
1730                 }
1731
1732                 #It would be nice to see where the user had actually come from, but for now just guess
1733                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1734                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1735
1736                 $dbw = wfGetDB( DB_MASTER );
1737                 $errors = $rc->doMarkPatrolled();
1738
1739                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1740                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1741                         return;
1742                 }
1743
1744                 if( in_array(array('hookaborted'), $errors) ) {
1745                         // The hook itself has handled any output
1746                         return;
1747                 }
1748
1749                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1750                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1751                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1752                         $wgOut->returnToMain( false, $return );
1753                         return;
1754                 }
1755
1756                 if( !empty($errors) ) {
1757                         $wgOut->showPermissionsErrorPage( $errors );
1758                         return;
1759                 }
1760
1761                 # Inform the user
1762                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1763                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1764                 $wgOut->returnToMain( false, $return );
1765         }
1766
1767         /**
1768          * User-interface handler for the "watch" action
1769          */
1770
1771         public function watch() {
1772                 global $wgUser, $wgOut;
1773                 if( $wgUser->isAnon() ) {
1774                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1775                         return;
1776                 }
1777                 if( wfReadOnly() ) {
1778                         $wgOut->readOnlyPage();
1779                         return;
1780                 }
1781                 if( $this->doWatch() ) {
1782                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1783                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1784                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1785                 }
1786                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1787         }
1788
1789         /**
1790          * Add this page to $wgUser's watchlist
1791          * @return bool true on successful watch operation
1792          */
1793         public function doWatch() {
1794                 global $wgUser;
1795                 if( $wgUser->isAnon() ) {
1796                         return false;
1797                 }
1798                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1799                         $wgUser->addWatch( $this->mTitle );
1800                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1801                 }
1802                 return false;
1803         }
1804
1805         /**
1806          * User interface handler for the "unwatch" action.
1807          */
1808         public function unwatch() {
1809                 global $wgUser, $wgOut;
1810                 if( $wgUser->isAnon() ) {
1811                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1812                         return;
1813                 }
1814                 if( wfReadOnly() ) {
1815                         $wgOut->readOnlyPage();
1816                         return;
1817                 }
1818                 if( $this->doUnwatch() ) {
1819                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1820                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1821                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1822                 }
1823                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1824         }
1825
1826         /**
1827          * Stop watching a page
1828          * @return bool true on successful unwatch
1829          */
1830         public function doUnwatch() {
1831                 global $wgUser;
1832                 if( $wgUser->isAnon() ) {
1833                         return false;
1834                 }
1835                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1836                         $wgUser->removeWatch( $this->mTitle );
1837                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1838                 }
1839                 return false;
1840         }
1841
1842         /**
1843          * action=protect handler
1844          */
1845         public function protect() {
1846                 $form = new ProtectionForm( $this );
1847                 $form->execute();
1848         }
1849
1850         /**
1851          * action=unprotect handler (alias)
1852          */
1853         public function unprotect() {
1854                 $this->protect();
1855         }
1856
1857         /**
1858          * Update the article's restriction field, and leave a log entry.
1859          *
1860          * @param $limit Array: set of restriction keys
1861          * @param $reason String
1862          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1863          * @param $expiry Array: per restriction type expiration
1864          * @return bool true on success
1865          */
1866         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1867                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1868
1869                 $id = $this->mTitle->getArticleID();
1870                 if( $id <= 0 || wfReadOnly() || !$this->mTitle->userCan('protect') ) {
1871                         return false;
1872                 }
1873
1874                 if( !$cascade ) {
1875                         $cascade = false;
1876                 }
1877
1878                 // Take this opportunity to purge out expired restrictions
1879                 Title::purgeExpiredRestrictions();
1880
1881                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1882                 # we expect a single selection, but the schema allows otherwise.
1883                 $current = array();
1884                 $updated = Article::flattenRestrictions( $limit );
1885                 $changed = false;
1886                 foreach( $wgRestrictionTypes as $action ) {
1887                         if( isset( $expiry[$action] ) ) {
1888                                 # Get current restrictions on $action
1889                                 $aLimits = $this->mTitle->getRestrictions( $action );
1890                                 $current[$action] = implode( '', $aLimits );
1891                                 # Are any actual restrictions being dealt with here?
1892                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1893                                 # If something changed, we need to log it. Checking $aRChanged
1894                                 # assures that "unprotecting" a page that is not protected does
1895                                 # not log just because the expiry was "changed".
1896                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1897                                         $changed = true;
1898                                 }
1899                         }
1900                 }
1901
1902                 $current = Article::flattenRestrictions( $current );
1903
1904                 $changed = ($changed || $current != $updated );
1905                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1906                 $protect = ( $updated != '' );
1907
1908                 # If nothing's changed, do nothing
1909                 if( $changed ) {
1910                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1911
1912                                 $dbw = wfGetDB( DB_MASTER );
1913
1914                                 # Prepare a null revision to be added to the history
1915                                 $modified = $current != '' && $protect;
1916                                 if( $protect ) {
1917                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1918                                 } else {
1919                                         $comment_type = 'unprotectedarticle';
1920                                 }
1921                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1922
1923                                 # Only restrictions with the 'protect' right can cascade...
1924                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1925                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1926                                 # The schema allows multiple restrictions
1927                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
1928                                         $cascade = false;
1929                                 $cascade_description = '';
1930                                 if( $cascade ) {
1931                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1932                                 }
1933
1934                                 if( $reason )
1935                                         $comment .= ": $reason";
1936
1937                                 $editComment = $comment;
1938                                 $encodedExpiry = array();
1939                                 $protect_description = '';
1940                                 foreach( $limit as $action => $restrictions  ) {
1941                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1942                                         if( $restrictions != '' ) {
1943                                                 $protect_description .= "[$action=$restrictions] (";
1944                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1945                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1946                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1947                                                 } else {
1948                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1949                                                 }
1950                                                 $protect_description .= ') ';
1951                                         }
1952                                 }
1953                                 $protect_description = trim($protect_description);
1954
1955                                 if( $protect_description && $protect )
1956                                         $editComment .= " ($protect_description)";
1957                                 if( $cascade )
1958                                         $editComment .= "$cascade_description";
1959                                 # Update restrictions table
1960                                 foreach( $limit as $action => $restrictions ) {
1961                                         if($restrictions != '' ) {
1962                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1963                                                         array( 'pr_page' => $id,
1964                                                                 'pr_type' => $action,
1965                                                                 'pr_level' => $restrictions,
1966                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1967                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1968                                         } else {
1969                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1970                                                         'pr_type' => $action ), __METHOD__ );
1971                                         }
1972                                 }
1973
1974                                 # Insert a null revision
1975                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1976                                 $nullRevId = $nullRevision->insertOn( $dbw );
1977
1978                                 $latest = $this->getLatest();
1979                                 # Update page record
1980                                 $dbw->update( 'page',
1981                                         array( /* SET */
1982                                                 'page_touched' => $dbw->timestamp(),
1983                                                 'page_restrictions' => '',
1984                                                 'page_latest' => $nullRevId
1985                                         ), array( /* WHERE */
1986                                                 'page_id' => $id
1987                                         ), 'Article::protect'
1988                                 );
1989
1990                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
1991                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1992
1993                                 # Update the protection log
1994                                 $log = new LogPage( 'protect' );
1995                                 if( $protect ) {
1996                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1997                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1998                                 } else {
1999                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2000                                 }
2001
2002                         } # End hook
2003                 } # End "changed" check
2004
2005                 return true;
2006         }
2007
2008         /**
2009          * Take an array of page restrictions and flatten it to a string
2010          * suitable for insertion into the page_restrictions field.
2011          * @param $limit Array
2012          * @return String
2013          */
2014         protected static function flattenRestrictions( $limit ) {
2015                 if( !is_array( $limit ) ) {
2016                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2017                 }
2018                 $bits = array();
2019                 ksort( $limit );
2020                 foreach( $limit as $action => $restrictions ) {
2021                         if( $restrictions != '' ) {
2022                                 $bits[] = "$action=$restrictions";
2023                         }
2024                 }
2025                 return implode( ':', $bits );
2026         }
2027
2028         /**
2029          * Auto-generates a deletion reason
2030          * @param &$hasHistory Boolean: whether the page has a history
2031          */
2032         public function generateReason( &$hasHistory ) {
2033                 global $wgContLang;
2034                 $dbw = wfGetDB( DB_MASTER );
2035                 // Get the last revision
2036                 $rev = Revision::newFromTitle( $this->mTitle );
2037                 if( is_null( $rev ) )
2038                         return false;
2039
2040                 // Get the article's contents
2041                 $contents = $rev->getText();
2042                 $blank = false;
2043                 // If the page is blank, use the text from the previous revision,
2044                 // which can only be blank if there's a move/import/protect dummy revision involved
2045                 if( $contents == '' ) {
2046                         $prev = $rev->getPrevious();
2047                         if( $prev )     {
2048                                 $contents = $prev->getText();
2049                                 $blank = true;
2050                         }
2051                 }
2052
2053                 // Find out if there was only one contributor
2054                 // Only scan the last 20 revisions
2055                 $limit = 20;
2056                 $res = $dbw->select( 'revision', 'rev_user_text',
2057                         array( 'rev_page' => $this->getID() ), __METHOD__,
2058                         array( 'LIMIT' => $limit )
2059                 );
2060                 if( $res === false )
2061                         // This page has no revisions, which is very weird
2062                         return false;
2063                 if( $res->numRows() > 1 )
2064                                 $hasHistory = true;
2065                 else
2066                                 $hasHistory = false;
2067                 $row = $dbw->fetchObject( $res );
2068                 $onlyAuthor = $row->rev_user_text;
2069                 // Try to find a second contributor
2070                 foreach( $res as $row ) {
2071                         if( $row->rev_user_text != $onlyAuthor ) {
2072                                 $onlyAuthor = false;
2073                                 break;
2074                         }
2075                 }
2076                 $dbw->freeResult( $res );
2077
2078                 // Generate the summary with a '$1' placeholder
2079                 if( $blank ) {
2080                         // The current revision is blank and the one before is also
2081                         // blank. It's just not our lucky day
2082                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2083                 } else {
2084                         if( $onlyAuthor )
2085                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2086                         else
2087                                 $reason = wfMsgForContent( 'excontent', '$1' );
2088                 }
2089
2090                 if( $reason == '-' ) {
2091                         // Allow these UI messages to be blanked out cleanly
2092                         return '';
2093                 }
2094
2095                 // Replace newlines with spaces to prevent uglyness
2096                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2097                 // Calculate the maximum amount of chars to get
2098                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2099                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2100                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2101                 // Remove possible unfinished links
2102                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2103                 // Now replace the '$1' placeholder
2104                 $reason = str_replace( '$1', $contents, $reason );
2105                 return $reason;
2106         }
2107
2108
2109         /*
2110          * UI entry point for page deletion
2111          */
2112         public function delete() {
2113                 global $wgUser, $wgOut, $wgRequest;
2114
2115                 $confirm = $wgRequest->wasPosted() &&
2116                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2117
2118                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2119                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2120
2121                 $reason = $this->DeleteReasonList;
2122
2123                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2124                         // Entry from drop down menu + additional comment
2125                         $reason .= ': ' . $this->DeleteReason;
2126                 } elseif( $reason == 'other' ) {
2127                         $reason = $this->DeleteReason;
2128                 }
2129                 # Flag to hide all contents of the archived revisions
2130                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2131
2132                 # This code desperately needs to be totally rewritten
2133
2134                 # Read-only check...
2135                 if( wfReadOnly() ) {
2136                         $wgOut->readOnlyPage();
2137                         return;
2138                 }
2139
2140                 # Check permissions
2141                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2142
2143                 if( count( $permission_errors ) > 0 ) {
2144                         $wgOut->showPermissionsErrorPage( $permission_errors );
2145                         return;
2146                 }
2147
2148                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2149
2150                 # Better double-check that it hasn't been deleted yet!
2151                 $dbw = wfGetDB( DB_MASTER );
2152                 $conds = $this->mTitle->pageCond();
2153                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2154                 if( $latest === false ) {
2155                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2156                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2157                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2158                         return;
2159                 }
2160
2161                 # Hack for big sites
2162                 $bigHistory = $this->isBigDeletion();
2163                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2164                         global $wgLang, $wgDeleteRevisionsLimit;
2165                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2166                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2167                         return;
2168                 }
2169
2170                 if( $confirm ) {
2171                         $this->doDelete( $reason, $suppress );
2172                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2173                                 $this->doWatch();
2174                         } elseif( $this->mTitle->userIsWatching() ) {
2175                                 $this->doUnwatch();
2176                         }
2177                         return;
2178                 }
2179
2180                 // Generate deletion reason
2181                 $hasHistory = false;
2182                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2183
2184                 // If the page has a history, insert a warning
2185                 if( $hasHistory && !$confirm ) {
2186                         $skin = $wgUser->getSkin();
2187                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2188                         if( $bigHistory ) {
2189                                 global $wgLang, $wgDeleteRevisionsLimit;
2190                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2191                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2192                         }
2193                 }
2194
2195                 return $this->confirmDelete( $reason );
2196         }
2197
2198         /**
2199          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2200          */
2201         public function isBigDeletion() {
2202                 global $wgDeleteRevisionsLimit;
2203                 if( $wgDeleteRevisionsLimit ) {
2204                         $revCount = $this->estimateRevisionCount();
2205                         return $revCount > $wgDeleteRevisionsLimit;
2206                 }
2207                 return false;
2208         }
2209
2210         /**
2211          * @return int approximate revision count
2212          */
2213         public function estimateRevisionCount() {
2214                 $dbr = wfGetDB( DB_SLAVE );
2215                 // For an exact count...
2216                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2217                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2218                 return $dbr->estimateRowCount( 'revision', '*',
2219                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2220         }
2221
2222         /**
2223          * Get the last N authors
2224          * @param $num Integer: number of revisions to get
2225          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2226          * @return array Array of authors, duplicates not removed
2227          */
2228         public function getLastNAuthors( $num, $revLatest = 0 ) {
2229                 wfProfileIn( __METHOD__ );
2230                 // First try the slave
2231                 // If that doesn't have the latest revision, try the master
2232                 $continue = 2;
2233                 $db = wfGetDB( DB_SLAVE );
2234                 do {
2235                         $res = $db->select( array( 'page', 'revision' ),
2236                                 array( 'rev_id', 'rev_user_text' ),
2237                                 array(
2238                                         'page_namespace' => $this->mTitle->getNamespace(),
2239                                         'page_title' => $this->mTitle->getDBkey(),
2240                                         'rev_page = page_id'
2241                                 ), __METHOD__, $this->getSelectOptions( array(
2242                                         'ORDER BY' => 'rev_timestamp DESC',
2243                                         'LIMIT' => $num
2244                                 ) )
2245                         );
2246                         if( !$res ) {
2247                                 wfProfileOut( __METHOD__ );
2248                                 return array();
2249                         }
2250                         $row = $db->fetchObject( $res );
2251                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2252                                 $db = wfGetDB( DB_MASTER );
2253                                 $continue--;
2254                         } else {
2255                                 $continue = 0;
2256                         }
2257                 } while ( $continue );
2258
2259                 $authors = array( $row->rev_user_text );
2260                 while ( $row = $db->fetchObject( $res ) ) {
2261                         $authors[] = $row->rev_user_text;
2262                 }
2263                 wfProfileOut( __METHOD__ );
2264                 return $authors;
2265         }
2266
2267         /**
2268          * Output deletion confirmation dialog
2269          * @param $reason String: prefilled reason
2270          */
2271         public function confirmDelete( $reason ) {
2272                 global $wgOut, $wgUser;
2273
2274                 wfDebug( "Article::confirmDelete\n" );
2275
2276                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2277                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2278                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2279
2280                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2281                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2282                                         <td></td>
2283                                         <td class='mw-input'>" .
2284                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2285                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2286                                         "</td>
2287                                 </tr>";
2288                 } else {
2289                         $suppress = '';
2290                 }
2291                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2292
2293                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2294                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2295                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2296                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2297                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2298                         "<tr id=\"wpDeleteReasonListRow\">
2299                                 <td class='mw-label'>" .
2300                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2301                                 "</td>
2302                                 <td class='mw-input'>" .
2303                                         Xml::listDropDown( 'wpDeleteReasonList',
2304                                                 wfMsgForContent( 'deletereason-dropdown' ),
2305                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2306                                 "</td>
2307                         </tr>
2308                         <tr id=\"wpDeleteReasonRow\">
2309                                 <td class='mw-label'>" .
2310                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2311                                 "</td>
2312                                 <td class='mw-input'>" .
2313                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2314                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2315                                 "</td>
2316                         </tr>
2317                         <tr>
2318                                 <td></td>
2319                                 <td class='mw-input'>" .
2320                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2321                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2322                                 "</td>
2323                         </tr>
2324                         $suppress
2325                         <tr>
2326                                 <td></td>
2327                                 <td class='mw-submit'>" .
2328                                         Xml::submitButton( wfMsg( 'deletepage' ),
2329                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2330                                 "</td>
2331                         </tr>" .
2332                         Xml::closeElement( 'table' ) .
2333                         Xml::closeElement( 'fieldset' ) .
2334                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2335                         Xml::closeElement( 'form' );
2336
2337                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2338                                 $skin = $wgUser->getSkin();
2339                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2340                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2341                         }
2342
2343                 $wgOut->addHTML( $form );
2344                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2345         }
2346
2347         /**
2348          * Perform a deletion and output success or failure messages
2349          */
2350         public function doDelete( $reason, $suppress = false ) {
2351                 global $wgOut, $wgUser;
2352                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2353
2354                 $error = '';
2355                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2356                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2357                                 $deleted = $this->mTitle->getPrefixedText();
2358
2359                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2360                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2361
2362                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2363
2364                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2365                                 $wgOut->returnToMain( false );
2366                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2367                         } else {
2368                                 if( $error == '' ) {
2369                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2370                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2371                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2372                                 } else {
2373                                         $wgOut->showFatalError( $error );
2374                                 }
2375                         }
2376                 }
2377         }
2378
2379         /**
2380          * Back-end article deletion
2381          * Deletes the article with database consistency, writes logs, purges caches
2382          * Returns success
2383          */
2384         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2385                 global $wgUseSquid, $wgDeferredUpdateList;
2386                 global $wgUseTrackbacks;
2387
2388                 wfDebug( __METHOD__."\n" );
2389
2390                 $dbw = wfGetDB( DB_MASTER );
2391                 $ns = $this->mTitle->getNamespace();
2392                 $t = $this->mTitle->getDBkey();
2393                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2394
2395                 if( $t == '' || $id == 0 ) {
2396                         return false;
2397                 }
2398
2399                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2400                 array_push( $wgDeferredUpdateList, $u );
2401
2402                 // Bitfields to further suppress the content
2403                 if( $suppress ) {
2404                         $bitfield = 0;
2405                         // This should be 15...
2406                         $bitfield |= Revision::DELETED_TEXT;
2407                         $bitfield |= Revision::DELETED_COMMENT;
2408                         $bitfield |= Revision::DELETED_USER;
2409                         $bitfield |= Revision::DELETED_RESTRICTED;
2410                 } else {
2411                         $bitfield = 'rev_deleted';
2412                 }
2413
2414                 $dbw->begin();
2415                 // For now, shunt the revision data into the archive table.
2416                 // Text is *not* removed from the text table; bulk storage
2417                 // is left intact to avoid breaking block-compression or
2418                 // immutable storage schemes.
2419                 //
2420                 // For backwards compatibility, note that some older archive
2421                 // table entries will have ar_text and ar_flags fields still.
2422                 //
2423                 // In the future, we may keep revisions and mark them with
2424                 // the rev_deleted field, which is reserved for this purpose.
2425                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2426                         array(
2427                                 'ar_namespace'  => 'page_namespace',
2428                                 'ar_title'      => 'page_title',
2429                                 'ar_comment'    => 'rev_comment',
2430                                 'ar_user'       => 'rev_user',
2431                                 'ar_user_text'  => 'rev_user_text',
2432                                 'ar_timestamp'  => 'rev_timestamp',
2433                                 'ar_minor_edit' => 'rev_minor_edit',
2434                                 'ar_rev_id'     => 'rev_id',
2435                                 'ar_text_id'    => 'rev_text_id',
2436                                 'ar_text'       => '\'\'', // Be explicit to appease
2437                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2438                                 'ar_len'        => 'rev_len',
2439                                 'ar_page_id'    => 'page_id',
2440                                 'ar_deleted'    => $bitfield
2441                         ), array(
2442                                 'page_id' => $id,
2443                                 'page_id = rev_page'
2444                         ), __METHOD__
2445                 );
2446
2447                 # Delete restrictions for it
2448                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2449
2450                 # Now that it's safely backed up, delete it
2451                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2452                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2453                 if( !$ok ) {
2454                         $dbw->rollback();
2455                         return false;
2456                 }
2457
2458                 # If using cascading deletes, we can skip some explicit deletes
2459                 if( !$dbw->cascadingDeletes() ) {
2460                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2461
2462                         if($wgUseTrackbacks)
2463                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2464
2465                         # Delete outgoing links
2466                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2467                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2468                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2469                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2470                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2471                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2472                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2473                 }
2474
2475                 # If using cleanup triggers, we can skip some manual deletes
2476                 if( !$dbw->cleanupTriggers() ) {
2477                         # Clean up recentchanges entries...
2478                         $dbw->delete( 'recentchanges',
2479                                 array( 'rc_type != '.RC_LOG,
2480                                         'rc_namespace' => $this->mTitle->getNamespace(),
2481                                         'rc_title' => $this->mTitle->getDBKey() ),
2482                                 __METHOD__ );
2483                         $dbw->delete( 'recentchanges',
2484                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2485                                 __METHOD__ );
2486                 }
2487
2488                 # Clear caches
2489                 Article::onArticleDelete( $this->mTitle );
2490
2491                 # Fix category table counts
2492                 $cats = array();
2493                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2494                 foreach( $res as $row ) {
2495                         $cats []= $row->cl_to;
2496                 }
2497                 $this->updateCategoryCounts( array(), $cats );
2498
2499                 # Clear the cached article id so the interface doesn't act like we exist
2500                 $this->mTitle->resetArticleID( 0 );
2501                 $this->mTitle->mArticleID = 0;
2502
2503                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2504                 $logtype = $suppress ? 'suppress' : 'delete';
2505                 $log = new LogPage( $logtype );
2506
2507                 # Make sure logging got through
2508                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2509
2510                 $dbw->commit();
2511
2512                 return true;
2513         }
2514
2515         /**
2516          * Roll back the most recent consecutive set of edits to a page
2517          * from the same user; fails if there are no eligible edits to
2518          * roll back to, e.g. user is the sole contributor. This function
2519          * performs permissions checks on $wgUser, then calls commitRollback()
2520          * to do the dirty work
2521          *
2522          * @param $fromP String: Name of the user whose edits to rollback.
2523          * @param $summary String: Custom summary. Set to default summary if empty.
2524          * @param $token String: Rollback token.
2525          * @param $bot Boolean: If true, mark all reverted edits as bot.
2526          *
2527          * @param $resultDetails Array: contains result-specific array of additional values
2528          *    'alreadyrolled' : 'current' (rev)
2529          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2530          *
2531          * @return array of errors, each error formatted as
2532          *   array(messagekey, param1, param2, ...).
2533          * On success, the array is empty.  This array can also be passed to
2534          * OutputPage::showPermissionsErrorPage().
2535          */
2536         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2537                 global $wgUser;
2538                 $resultDetails = null;
2539
2540                 # Check permissions
2541                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2542                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2543                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2544
2545                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2546                         $errors[] = array( 'sessionfailure' );
2547
2548                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2549                         $errors[] = array( 'actionthrottledtext' );
2550                 }
2551                 # If there were errors, bail out now
2552                 if( !empty( $errors ) )
2553                         return $errors;
2554
2555                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2556         }
2557
2558         /**
2559          * Backend implementation of doRollback(), please refer there for parameter
2560          * and return value documentation
2561          *
2562          * NOTE: This function does NOT check ANY permissions, it just commits the
2563          * rollback to the DB Therefore, you should only call this function direct-
2564          * ly if you want to use custom permissions checks. If you don't, use
2565          * doRollback() instead.
2566          */
2567         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2568                 global $wgUseRCPatrol, $wgUser, $wgLang;
2569                 $dbw = wfGetDB( DB_MASTER );
2570
2571                 if( wfReadOnly() ) {
2572                         return array( array( 'readonlytext' ) );
2573                 }
2574
2575                 # Get the last editor
2576                 $current = Revision::newFromTitle( $this->mTitle );
2577                 if( is_null( $current ) ) {
2578                         # Something wrong... no page?
2579                         return array(array('notanarticle'));
2580                 }
2581
2582                 $from = str_replace( '_', ' ', $fromP );
2583                 if( $from != $current->getUserText() ) {
2584                         $resultDetails = array( 'current' => $current );
2585                         return array(array('alreadyrolled',
2586                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2587                                 htmlspecialchars($fromP),
2588                                 htmlspecialchars($current->getUserText())
2589                         ));
2590                 }
2591
2592                 # Get the last edit not by this guy
2593                 $user = intval( $current->getUser() );
2594                 $user_text = $dbw->addQuotes( $current->getUserText() );
2595                 $s = $dbw->selectRow( 'revision',
2596                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2597                         array(  'rev_page' => $current->getPage(),
2598                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2599                         ), __METHOD__,
2600                         array(  'USE INDEX' => 'page_timestamp',
2601                                 'ORDER BY'  => 'rev_timestamp DESC' )
2602                         );
2603                 if( $s === false ) {
2604                         # No one else ever edited this page
2605                         return array(array('cantrollback'));
2606                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2607                         # Only admins can see this text
2608                         return array(array('notvisiblerev'));
2609                 }
2610
2611                 $set = array();
2612                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2613                         # Mark all reverted edits as bot
2614                         $set['rc_bot'] = 1;
2615                 }
2616                 if( $wgUseRCPatrol ) {
2617                         # Mark all reverted edits as patrolled
2618                         $set['rc_patrolled'] = 1;
2619                 }
2620
2621                 if( $set ) {
2622                         $dbw->update( 'recentchanges', $set,
2623                                         array( /* WHERE */
2624                                                 'rc_cur_id' => $current->getPage(),
2625                                                 'rc_user_text' => $current->getUserText(),
2626                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2627                                         ), __METHOD__
2628                                 );
2629                 }
2630
2631                 # Generate the edit summary if necessary
2632                 $target = Revision::newFromId( $s->rev_id );
2633                 if( empty( $summary ) ){
2634                         $summary = wfMsgForContent( 'revertpage' );
2635                 }
2636
2637                 # Allow the custom summary to use the same args as the default message
2638                 $args = array(
2639                         $target->getUserText(), $from, $s->rev_id,
2640                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2641                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2642                 );
2643                 $summary = wfMsgReplaceArgs( $summary, $args );
2644
2645                 # Save
2646                 $flags = EDIT_UPDATE;
2647
2648                 if( $wgUser->isAllowed('minoredit') )
2649                         $flags |= EDIT_MINOR;
2650
2651                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2652                         $flags |= EDIT_FORCE_BOT;
2653                 # Actually store the edit
2654                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2655                 if( !empty( $status->value['revision'] ) ) {
2656                         $revId = $status->value['revision']->getId();
2657                 } else {
2658                         $revId = false;
2659                 }
2660
2661                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2662
2663                 $resultDetails = array(
2664                         'summary' => $summary,
2665                         'current' => $current,
2666                         'target' => $target,
2667                         'newid' => $revId
2668                 );
2669                 return array();
2670         }
2671
2672         /**
2673          * User interface for rollback operations
2674          */
2675         public function rollback() {
2676                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2677                 $details = null;
2678
2679                 $result = $this->doRollback(
2680                         $wgRequest->getVal( 'from' ),
2681                         $wgRequest->getText( 'summary' ),
2682                         $wgRequest->getVal( 'token' ),
2683                         $wgRequest->getBool( 'bot' ),
2684                         $details
2685                 );
2686
2687                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2688                         $wgOut->rateLimited();
2689                         return;
2690                 }
2691                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2692                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2693                         $errArray = $result[0];
2694                         $errMsg = array_shift( $errArray );
2695                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2696                         if( isset( $details['current'] ) ){
2697                                 $current = $details['current'];
2698                                 if( $current->getComment() != '' ) {
2699                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2700                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2701                                 }
2702                         }
2703                         return;
2704                 }
2705                 # Display permissions errors before read-only message -- there's no
2706                 # point in misleading the user into thinking the inability to rollback
2707                 # is only temporary.
2708                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2709                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2710                         # move any 'readonlytext' error manually.
2711                         $out = array();
2712                         foreach( $result as $error ) {
2713                                 if( $error != array( 'readonlytext' ) ) {
2714                                         $out []= $error;
2715                                 }
2716                         }
2717                         $wgOut->showPermissionsErrorPage( $out );
2718                         return;
2719                 }
2720                 if( $result == array( array( 'readonlytext' ) ) ) {
2721                         $wgOut->readOnlyPage();
2722                         return;
2723                 }
2724
2725                 $current = $details['current'];
2726                 $target = $details['target'];
2727                 $newId = $details['newid'];
2728                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2729                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2730                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2731                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2732                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2733                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2734                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2735                 $wgOut->returnToMain( false, $this->mTitle );
2736
2737                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2738                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2739                         $de->showDiff( '', '' );
2740                 }
2741         }
2742
2743
2744         /**
2745          * Do standard deferred updates after page view
2746          */
2747         public function viewUpdates() {
2748                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2749                 # Don't update page view counters on views from bot users (bug 14044)
2750                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2751                         Article::incViewCount( $this->getID() );
2752                         $u = new SiteStatsUpdate( 1, 0, 0 );
2753                         array_push( $wgDeferredUpdateList, $u );
2754                 }
2755                 # Update newtalk / watchlist notification status
2756                 $wgUser->clearNotification( $this->mTitle );
2757         }
2758
2759         /**
2760          * Prepare text which is about to be saved.
2761          * Returns a stdclass with source, pst and output members
2762          */
2763         public function prepareTextForEdit( $text, $revid=null ) {
2764                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2765                         // Already prepared
2766                         return $this->mPreparedEdit;
2767                 }
2768                 global $wgParser;
2769                 $edit = (object)array();
2770                 $edit->revid = $revid;
2771                 $edit->newText = $text;
2772                 $edit->pst = $this->preSaveTransform( $text );
2773                 $options = new ParserOptions;
2774                 $options->setTidy( true );
2775                 $options->enableLimitReport();
2776                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2777                 $edit->oldText = $this->getContent();
2778                 $this->mPreparedEdit = $edit;
2779                 return $edit;
2780         }
2781
2782         /**
2783          * Do standard deferred updates after page edit.
2784          * Update links tables, site stats, search index and message cache.
2785          * Purges pages that include this page if the text was changed here.
2786          * Every 100th edit, prune the recent changes table.
2787          *
2788          * @private
2789          * @param $text New text of the article
2790          * @param $summary Edit summary
2791          * @param $minoredit Minor edit
2792          * @param $timestamp_of_pagechange Timestamp associated with the page change
2793          * @param $newid rev_id value of the new revision
2794          * @param $changed Whether or not the content actually changed
2795          */
2796         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2797                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2798
2799                 wfProfileIn( __METHOD__ );
2800
2801                 # Parse the text
2802                 # Be careful not to double-PST: $text is usually already PST-ed once
2803                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2804                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2805                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2806                 } else {
2807                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2808                         $editInfo = $this->mPreparedEdit;
2809                 }
2810
2811                 # Save it to the parser cache
2812                 if( $wgEnableParserCache ) {
2813                         $parserCache = ParserCache::singleton();
2814                         $parserCache->save( $editInfo->output, $this, $wgUser );
2815                 }
2816
2817                 # Update the links tables
2818                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2819                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2820                 $u->doUpdate();
2821
2822                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2823
2824                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2825                         if( 0 == mt_rand( 0, 99 ) ) {
2826                                 // Flush old entries from the `recentchanges` table; we do this on
2827                                 // random requests so as to avoid an increase in writes for no good reason
2828                                 global $wgRCMaxAge;
2829                                 $dbw = wfGetDB( DB_MASTER );
2830                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2831                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2832                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2833                                 $dbw->query( $sql );
2834                         }
2835                 }
2836
2837                 $id = $this->getID();
2838                 $title = $this->mTitle->getPrefixedDBkey();
2839                 $shortTitle = $this->mTitle->getDBkey();
2840
2841                 if( 0 == $id ) {
2842                         wfProfileOut( __METHOD__ );
2843                         return;
2844                 }
2845
2846                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2847                 array_push( $wgDeferredUpdateList, $u );
2848                 $u = new SearchUpdate( $id, $title, $text );
2849                 array_push( $wgDeferredUpdateList, $u );
2850
2851                 # If this is another user's talk page, update newtalk
2852                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2853                 # load of user talk pages and piss people off, nor if it's a minor edit
2854                 # by a properly-flagged bot.
2855                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2856                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2857                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2858                                 $other = User::newFromName( $shortTitle, false );
2859                                 if( !$other ) {
2860                                         wfDebug( __METHOD__.": invalid username\n" );
2861                                 } elseif( User::isIP( $shortTitle ) ) {
2862                                         // An anonymous user
2863                                         $other->setNewtalk( true );
2864                                 } elseif( $other->isLoggedIn() ) {
2865                                         $other->setNewtalk( true );
2866                                 } else {
2867                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2868                                 }
2869                         }
2870                 }
2871
2872                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2873                         $wgMessageCache->replace( $shortTitle, $text );
2874                 }
2875
2876                 wfProfileOut( __METHOD__ );
2877         }
2878
2879         /**
2880          * Perform article updates on a special page creation.
2881          *
2882          * @param $rev Revision object
2883          *
2884          * @todo This is a shitty interface function. Kill it and replace the
2885          * other shitty functions like editUpdates and such so it's not needed
2886          * anymore.
2887          */
2888         public function createUpdates( $rev ) {
2889                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2890                 $this->mTotalAdjustment = 1;
2891                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2892                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2893         }
2894
2895         /**
2896          * Generate the navigation links when browsing through an article revisions
2897          * It shows the information as:
2898          *   Revision as of \<date\>; view current revision
2899          *   \<- Previous version | Next Version -\>
2900          *
2901          * @param $oldid String: revision ID of this article revision
2902          */
2903         public function setOldSubtitle( $oldid = 0 ) {
2904                 global $wgLang, $wgOut, $wgUser;
2905
2906                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
2907                         return;
2908                 }
2909
2910                 $revision = Revision::newFromId( $oldid );
2911
2912                 $current = ( $oldid == $this->mLatest );
2913                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2914                 $sk = $wgUser->getSkin();
2915                 $lnk = $current
2916                         ? wfMsgHtml( 'currentrevisionlink' )
2917                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
2918                 $curdiff = $current
2919                         ? wfMsgHtml( 'diff' )
2920                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
2921                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2922                 $prevlink = $prev
2923                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2924                         : wfMsgHtml( 'previousrevision' );
2925                 $prevdiff = $prev
2926                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
2927                         : wfMsgHtml( 'diff' );
2928                 $nextlink = $current
2929                         ? wfMsgHtml( 'nextrevision' )
2930                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2931                 $nextdiff = $current
2932                         ? wfMsgHtml( 'diff' )
2933                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
2934
2935                 $cdel='';
2936                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2937                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2938                         if( $revision->isCurrent() ) {
2939                         // We don't handle top deleted edits too well
2940                                 $cdel = wfMsgHtml( 'rev-delundel' );
2941                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2942                         // If revision was hidden from sysops
2943                                 $cdel = wfMsgHtml( 'rev-delundel' );
2944                         } else {
2945                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2946                                         wfMsgHtml('rev-delundel'),
2947                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2948                                         '&oldid=' . urlencode( $oldid ) );
2949                                 // Bolden oversighted content
2950                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2951                                         $cdel = "<strong>$cdel</strong>";
2952                         }
2953                         $cdel = "(<small>$cdel</small>) ";
2954                 }
2955                 # Show user links if allowed to see them. Normally they
2956                 # are hidden regardless, but since we can already see the text here...
2957                 $userlinks = $sk->revUserTools( $revision, false );
2958
2959                 $m = wfMsg( 'revision-info-current' );
2960                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2961                         ? 'revision-info-current'
2962                         : 'revision-info';
2963
2964                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ), $td, $userlinks, $revision->getID() ) . "</div>\n" .
2965
2966                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgHtml( 'revision-nav', $prevdiff,
2967                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2968                 $wgOut->setSubtitle( $r );
2969         }
2970
2971         /**
2972          * This function is called right before saving the wikitext,
2973          * so we can do things like signatures and links-in-context.
2974          *
2975          * @param $text String
2976          */
2977         public function preSaveTransform( $text ) {
2978                 global $wgParser, $wgUser;
2979                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2980         }
2981
2982         /* Caching functions */
2983
2984         /**
2985          * checkLastModified returns true if it has taken care of all
2986          * output to the client that is necessary for this request.
2987          * (that is, it has sent a cached version of the page)
2988          */
2989         protected function tryFileCache() {
2990                 static $called = false;
2991                 if( $called ) {
2992                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2993                         return false;
2994                 }
2995                 $called = true;
2996                 if( $this->isFileCacheable() ) {
2997                         $cache = new HTMLFileCache( $this->mTitle );
2998                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
2999                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3000                                 $cache->loadFromFileCache();
3001                                 return true;
3002                         } else {
3003                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3004                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3005                         }
3006                 } else {
3007                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3008                 }
3009                 return false;
3010         }
3011
3012         /**
3013          * Check if the page can be cached
3014          * @return bool
3015          */
3016         public function isFileCacheable() {
3017                 $cacheable = false;
3018                 if( HTMLFileCache::useFileCache() ) {
3019                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3020                         // Extension may have reason to disable file caching on some pages.
3021                         if( $cacheable ) {
3022                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3023                         }
3024                 }
3025                 return $cacheable;
3026         }
3027
3028         /**
3029          * Loads page_touched and returns a value indicating if it should be used
3030          *
3031          */
3032         public function checkTouched() {
3033                 if( !$this->mDataLoaded ) {
3034                         $this->loadPageData();
3035                 }
3036                 return !$this->mIsRedirect;
3037         }
3038
3039         /**
3040          * Get the page_touched field
3041          */
3042         public function getTouched() {
3043                 # Ensure that page data has been loaded
3044                 if( !$this->mDataLoaded ) {
3045                         $this->loadPageData();
3046                 }
3047                 return $this->mTouched;
3048         }
3049
3050         /**
3051          * Get the page_latest field
3052          */
3053         public function getLatest() {
3054                 if( !$this->mDataLoaded ) {
3055                         $this->loadPageData();
3056                 }
3057                 return $this->mLatest;
3058         }
3059
3060         /**
3061          * Edit an article without doing all that other stuff
3062          * The article must already exist; link tables etc
3063          * are not updated, caches are not flushed.
3064          *
3065          * @param $text String: text submitted
3066          * @param $comment String: comment submitted
3067          * @param $minor Boolean: whereas it's a minor modification
3068          */
3069         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3070                 wfProfileIn( __METHOD__ );
3071
3072                 $dbw = wfGetDB( DB_MASTER );
3073                 $revision = new Revision( array(
3074                         'page'       => $this->getId(),
3075                         'text'       => $text,
3076                         'comment'    => $comment,
3077                         'minor_edit' => $minor ? 1 : 0,
3078                         ) );
3079                 $revision->insertOn( $dbw );
3080                 $this->updateRevisionOn( $dbw, $revision );
3081
3082                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3083
3084                 wfProfileOut( __METHOD__ );
3085         }
3086
3087         /**
3088          * Used to increment the view counter
3089          *
3090          * @param $id Integer: article id
3091          */
3092         public static function incViewCount( $id ) {
3093                 $id = intval( $id );
3094                 global $wgHitcounterUpdateFreq, $wgDBtype;
3095
3096                 $dbw = wfGetDB( DB_MASTER );
3097                 $pageTable = $dbw->tableName( 'page' );
3098                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3099                 $acchitsTable = $dbw->tableName( 'acchits' );
3100
3101                 if( $wgHitcounterUpdateFreq <= 1 ) {
3102                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3103                         return;
3104                 }
3105
3106                 # Not important enough to warrant an error page in case of failure
3107                 $oldignore = $dbw->ignoreErrors( true );
3108
3109                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3110
3111                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3112                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3113                         # Most of the time (or on SQL errors), skip row count check
3114                         $dbw->ignoreErrors( $oldignore );
3115                         return;
3116                 }
3117
3118                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3119                 $row = $dbw->fetchObject( $res );
3120                 $rown = intval( $row->n );
3121                 if( $rown >= $wgHitcounterUpdateFreq ){
3122                         wfProfileIn( 'Article::incViewCount-collect' );
3123                         $old_user_abort = ignore_user_abort( true );
3124
3125                         if($wgDBtype == 'mysql')
3126                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3127                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3128                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3129                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3130                                 'GROUP BY hc_id');
3131                         $dbw->query("DELETE FROM $hitcounterTable");
3132                         if($wgDBtype == 'mysql') {
3133                                 $dbw->query('UNLOCK TABLES');
3134                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3135                                         'WHERE page_id = hc_id');
3136                         }
3137                         else {
3138                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3139                                         "FROM $acchitsTable WHERE page_id = hc_id");
3140                         }
3141                         $dbw->query("DROP TABLE $acchitsTable");
3142
3143                         ignore_user_abort( $old_user_abort );
3144                         wfProfileOut( 'Article::incViewCount-collect' );
3145                 }
3146                 $dbw->ignoreErrors( $oldignore );
3147         }
3148
3149         /**#@+
3150          * The onArticle*() functions are supposed to be a kind of hooks
3151          * which should be called whenever any of the specified actions
3152          * are done.
3153          *
3154          * This is a good place to put code to clear caches, for instance.
3155          *
3156          * This is called on page move and undelete, as well as edit
3157          *
3158          * @param $title a title object
3159          */
3160
3161         public static function onArticleCreate( $title ) {
3162                 # Update existence markers on article/talk tabs...
3163                 if( $title->isTalkPage() ) {
3164                         $other = $title->getSubjectPage();
3165                 } else {
3166                         $other = $title->getTalkPage();
3167                 }
3168                 $other->invalidateCache();
3169                 $other->purgeSquid();
3170
3171                 $title->touchLinks();
3172                 $title->purgeSquid();
3173                 $title->deleteTitleProtection();
3174         }
3175
3176         public static function onArticleDelete( $title ) {
3177                 global $wgMessageCache;
3178                 # Update existence markers on article/talk tabs...
3179                 if( $title->isTalkPage() ) {
3180                         $other = $title->getSubjectPage();
3181                 } else {
3182                         $other = $title->getTalkPage();
3183                 }
3184                 $other->invalidateCache();
3185                 $other->purgeSquid();
3186
3187                 $title->touchLinks();
3188                 $title->purgeSquid();
3189
3190                 # File cache
3191                 HTMLFileCache::clearFileCache( $title );
3192
3193                 # Messages
3194                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3195                         $wgMessageCache->replace( $title->getDBkey(), false );
3196                 }
3197                 # Images
3198                 if( $title->getNamespace() == NS_FILE ) {
3199                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3200                         $update->doUpdate();
3201                 }
3202                 # User talk pages
3203                 if( $title->getNamespace() == NS_USER_TALK ) {
3204                         $user = User::newFromName( $title->getText(), false );
3205                         $user->setNewtalk( false );
3206                 }
3207         }
3208
3209         /**
3210          * Purge caches on page update etc
3211          */
3212         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3213                 global $wgDeferredUpdateList;
3214
3215                 // Invalidate caches of articles which include this page
3216                 if( $transclusions !== 'skiptransclusions' )
3217                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3218
3219                 // Invalidate the caches of all pages which redirect here
3220                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3221
3222                 # Purge squid for this page only
3223                 $title->purgeSquid();
3224
3225                 # Clear file cache for this page only
3226                 HTMLFileCache::clearFileCache( $title );
3227         }
3228
3229         /**#@-*/
3230
3231         /**
3232          * Overriden by ImagePage class, only present here to avoid a fatal error
3233          * Called for ?action=revert
3234          */
3235         public function revert() {
3236                 global $wgOut;
3237                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3238         }
3239
3240         /**
3241          * Info about this page
3242          * Called for ?action=info when $wgAllowPageInfo is on.
3243          */
3244         public function info() {
3245                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3246
3247                 if( !$wgAllowPageInfo ) {
3248                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3249                         return;
3250                 }
3251
3252                 $page = $this->mTitle->getSubjectPage();
3253
3254                 $wgOut->setPagetitle( $page->getPrefixedText() );
3255                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3256                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3257
3258                 if( !$this->mTitle->exists() ) {
3259                         $wgOut->addHTML( '<div class="noarticletext">' );
3260                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3261                                 // This doesn't quite make sense; the user is asking for
3262                                 // information about the _page_, not the message... -- RC
3263                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3264                         } else {
3265                                 $msg = $wgUser->isLoggedIn()
3266                                         ? 'noarticletext'
3267                                         : 'noarticletextanon';
3268                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3269                         }
3270                         $wgOut->addHTML( '</div>' );
3271                 } else {
3272                         $dbr = wfGetDB( DB_SLAVE );
3273                         $wl_clause = array(
3274                                 'wl_title'     => $page->getDBkey(),
3275                                 'wl_namespace' => $page->getNamespace() );
3276                         $numwatchers = $dbr->selectField(
3277                                 'watchlist',
3278                                 'COUNT(*)',
3279                                 $wl_clause,
3280                                 __METHOD__,
3281                                 $this->getSelectOptions() );
3282
3283                         $pageInfo = $this->pageCountInfo( $page );
3284                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3285
3286                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3287                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3288                         if( $talkInfo ) {
3289                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3290                         }
3291                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3292                         if( $talkInfo ) {
3293                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3294                         }
3295                         $wgOut->addHTML( '</ul>' );
3296                 }
3297         }
3298
3299         /**
3300          * Return the total number of edits and number of unique editors
3301          * on a given page. If page does not exist, returns false.
3302          *
3303          * @param $title Title object
3304          * @return array
3305          */
3306         protected function pageCountInfo( $title ) {
3307                 $id = $title->getArticleId();
3308                 if( $id == 0 ) {
3309                         return false;
3310                 }
3311                 $dbr = wfGetDB( DB_SLAVE );
3312                 $rev_clause = array( 'rev_page' => $id );
3313                 $edits = $dbr->selectField(
3314                         'revision',
3315                         'COUNT(rev_page)',
3316                         $rev_clause,
3317                         __METHOD__,
3318                         $this->getSelectOptions()
3319                 );
3320                 $authors = $dbr->selectField(
3321                         'revision',
3322                         'COUNT(DISTINCT rev_user_text)',
3323                         $rev_clause,
3324                         __METHOD__,
3325                         $this->getSelectOptions()
3326                 );
3327                 return array( 'edits' => $edits, 'authors' => $authors );
3328         }
3329
3330         /**
3331          * Return a list of templates used by this article.
3332          * Uses the templatelinks table
3333          *
3334          * @return Array of Title objects
3335          */
3336         public function getUsedTemplates() {
3337                 $result = array();
3338                 $id = $this->mTitle->getArticleID();
3339                 if( $id == 0 ) {
3340                         return array();
3341                 }
3342                 $dbr = wfGetDB( DB_SLAVE );
3343                 $res = $dbr->select( array( 'templatelinks' ),
3344                         array( 'tl_namespace', 'tl_title' ),
3345                         array( 'tl_from' => $id ),
3346                         __METHOD__ );
3347                 if( $res !== false ) {
3348                         foreach( $res as $row ) {
3349                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3350                         }
3351                 }
3352                 $dbr->freeResult( $res );
3353                 return $result;
3354         }
3355
3356         /**
3357          * Returns a list of hidden categories this page is a member of.
3358          * Uses the page_props and categorylinks tables.
3359          *
3360          * @return Array of Title objects
3361          */
3362         public function getHiddenCategories() {
3363                 $result = array();
3364                 $id = $this->mTitle->getArticleID();
3365                 if( $id == 0 ) {
3366                         return array();
3367                 }
3368                 $dbr = wfGetDB( DB_SLAVE );
3369                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3370                         array( 'cl_to' ),
3371                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3372                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3373                         __METHOD__ );
3374                 if( $res !== false ) {
3375                         foreach( $res as $row ) {
3376                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3377                         }
3378                 }
3379                 $dbr->freeResult( $res );
3380                 return $result;
3381         }
3382
3383         /**
3384         * Return an applicable autosummary if one exists for the given edit.
3385         * @param $oldtext String: the previous text of the page.
3386         * @param $newtext String: The submitted text of the page.
3387         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3388         * @return string An appropriate autosummary, or an empty string.
3389         */
3390         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3391                 # Decide what kind of autosummary is needed.
3392
3393                 # Redirect autosummaries
3394                 $ot = Title::newFromRedirect( $oldtext );
3395                 $rt = Title::newFromRedirect( $newtext );
3396                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3397                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3398                 }
3399
3400                 # New page autosummaries
3401                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3402                         # If they're making a new article, give its text, truncated, in the summary.
3403                         global $wgContLang;
3404                         $truncatedtext = $wgContLang->truncate(
3405                                 str_replace("\n", ' ', $newtext),
3406                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3407                                 '...' );
3408                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3409                 }
3410
3411                 # Blanking autosummaries
3412                 if( $oldtext != '' && $newtext == '' ) {
3413                         return wfMsgForContent( 'autosumm-blank' );
3414                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3415                         # Removing more than 90% of the article
3416                         global $wgContLang;
3417                         $truncatedtext = $wgContLang->truncate(
3418                                 $newtext,
3419                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3420                                 '...'
3421                         );
3422                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3423                 }
3424
3425                 # If we reach this point, there's no applicable autosummary for our case, so our
3426                 # autosummary is empty.
3427                 return '';
3428         }
3429
3430         /**
3431          * Add the primary page-view wikitext to the output buffer
3432          * Saves the text into the parser cache if possible.
3433          * Updates templatelinks if it is out of date.
3434          *
3435          * @param $text String
3436          * @param $cache Boolean
3437          */
3438         public function outputWikiText( $text, $cache = true ) {
3439                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3440
3441                 $popts = $wgOut->parserOptions();
3442                 $popts->setTidy(true);
3443                 $popts->enableLimitReport();
3444                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3445                         $popts, true, true, $this->getRevIdFetched() );
3446                 $popts->setTidy(false);
3447                 $popts->enableLimitReport( false );
3448                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3449                         $parserCache = ParserCache::singleton();
3450                         $parserCache->save( $parserOutput, $this, $wgUser );
3451                 }
3452                 // Make sure file cache is not used on uncacheable content.
3453                 // Output that has magic words in it can still use the parser cache
3454                 // (if enabled), though it will generally expire sooner.
3455                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3456                         $wgUseFileCache = false;
3457                 }
3458
3459                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3460                         // templatelinks table may have become out of sync,
3461                         // especially if using variable-based transclusions.
3462                         // For paranoia, check if things have changed and if
3463                         // so apply updates to the database. This will ensure
3464                         // that cascaded protections apply as soon as the changes
3465                         // are visible.
3466
3467                         # Get templates from templatelinks
3468                         $id = $this->mTitle->getArticleID();
3469
3470                         $tlTemplates = array();
3471
3472                         $dbr = wfGetDB( DB_SLAVE );
3473                         $res = $dbr->select( array( 'templatelinks' ),
3474                                 array( 'tl_namespace', 'tl_title' ),
3475                                 array( 'tl_from' => $id ),
3476                                 __METHOD__ );
3477
3478                         global $wgContLang;
3479
3480                         if( $res !== false ) {
3481                                 foreach( $res as $row ) {
3482                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3483                                 }
3484                         }
3485
3486                         # Get templates from parser output.
3487                         $poTemplates_allns = $parserOutput->getTemplates();
3488
3489                         $poTemplates = array ();
3490                         foreach ( $poTemplates_allns as $ns_templates ) {
3491                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3492                         }
3493
3494                         # Get the diff
3495                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3496
3497                         if( count( $templates_diff ) > 0 ) {
3498                                 # Whee, link updates time.
3499                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3500                                 $u->doUpdate();
3501                         }
3502                 }
3503
3504                 $wgOut->addParserOutput( $parserOutput );
3505         }
3506
3507         /**
3508          * Update all the appropriate counts in the category table, given that
3509          * we've added the categories $added and deleted the categories $deleted.
3510          *
3511          * @param $added array   The names of categories that were added
3512          * @param $deleted array The names of categories that were deleted
3513          * @return null
3514          */
3515         public function updateCategoryCounts( $added, $deleted ) {
3516                 $ns = $this->mTitle->getNamespace();
3517                 $dbw = wfGetDB( DB_MASTER );
3518
3519                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3520                 # exist, we might legitimately not create it, but it's simpler to just
3521                 # create it and then give it a negative value, since the value is bogus
3522                 # anyway.
3523                 #
3524                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3525                 $insertCats = array_merge( $added, $deleted );
3526                 if( !$insertCats ) {
3527                         # Okay, nothing to do
3528                         return;
3529                 }
3530                 $insertRows = array();
3531                 foreach( $insertCats as $cat ) {
3532                         $insertRows[] = array( 'cat_title' => $cat );
3533                 }
3534                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3535
3536                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3537                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3538                 if( $ns == NS_CATEGORY ) {
3539                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3540                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3541                 } elseif( $ns == NS_FILE ) {
3542                         $addFields[]    = 'cat_files = cat_files + 1';
3543                         $removeFields[] = 'cat_files = cat_files - 1';
3544                 }
3545
3546                 if( $added ) {
3547                         $dbw->update(
3548                                 'category',
3549                                 $addFields,
3550                                 array( 'cat_title' => $added ),
3551                                 __METHOD__
3552                         );
3553                 }
3554                 if( $deleted ) {
3555                         $dbw->update(
3556                                 'category',
3557                                 $removeFields,
3558                                 array( 'cat_title' => $deleted ),
3559                                 __METHOD__
3560                         );
3561                 }
3562         }
3563 }