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