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::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 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 = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRe( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 701                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 702                         WHERE rev_page = $pageId
 703                         AND rev_user != $user
 704                         GROUP BY rev_user, rev_user_text, user_real_name
 705                         ORDER BY timestamp DESC";
 706
 707                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 708                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 709
 710                 $sql .= ' '. $this->getSelectOptions();
 711
 712                 $res = $dbr->query($sql, __METHOD__ );
 713
 714                 return new UserArrayFromResult( $res );
 715         }
 716
 717         /**
 718          * This is the default action of the script: just view the page of
 719          * the given title.
 720         */
 721         public function view() {
 722                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 723                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 724                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 725                 global $wgDefaultRobotPolicy;
 726
 727                 wfProfileIn( __METHOD__ );
 728
 729                 # Get variables from query string
 730                 $oldid = $this->getOldID();
 731
 732                 # Try file cache
 733                 if( $oldid === 0 && $this->checkTouched() ) {
 734                         global $wgUseETag;
 735                         if( $wgUseETag ) {
 736                                 $parserCache = ParserCache::singleton();
 737                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 738                         }
 739                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 740                                 wfProfileOut( __METHOD__ );
 741                                 return;
 742                         } else if( $this->tryFileCache() ) {
 743                                 # tell wgOut that output is taken care of
 744                                 $wgOut->disable();
 745                                 $this->viewUpdates();
 746                                 wfProfileOut( __METHOD__ );
 747                                 return;
 748                         }
 749                 }
 750
 751                 $ns = $this->mTitle->getNamespace(); # shortcut
 752                 $sk = $wgUser->getSkin();
 753
 754                 # getOldID may want us to redirect somewhere else
 755                 if( $this->mRedirectUrl ) {
 756                         $wgOut->redirect( $this->mRedirectUrl );
 757                         wfProfileOut( __METHOD__ );
 758                         return;
 759                 }
 760
 761                 $diff = $wgRequest->getVal( 'diff' );
 762                 $rcid = $wgRequest->getVal( 'rcid' );
 763                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 764                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 765                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 766                 $return404 = false;
 767
 768                 $wgOut->setArticleFlag( true );
 769
 770                 # Discourage indexing of printable versions, but encourage following
 771                 if( $wgOut->isPrintable() ) {
 772                         $policy = 'noindex,follow';
 773                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 774                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 775                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 776                         # Honour customised robot policies for this namespace
 777                         $policy = $wgNamespaceRobotPolicies[$ns];
 778                 } else {
 779                         $policy = $wgDefaultRobotPolicy;
 780                 }
 781                 $wgOut->setRobotPolicy( $policy );
 782
 783                 # If we got diff and oldid in the query, we want to see a
 784                 # diff page instead of the article.
 785
 786                 if( !is_null( $diff ) ) {
 787                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 788
 789                         $diff = $wgRequest->getVal( 'diff' );
 790                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 791                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 792                         // DifferenceEngine directly fetched the revision:
 793                         $this->mRevIdFetched = $de->mNewid;
 794                         $de->showDiffPage( $diffOnly );
 795
 796                         // Needed to get the page's current revision
 797                         $this->loadPageData();
 798                         if( $diff == 0 || $diff == $this->mLatest ) {
 799                                 # Run view updates for current revision only
 800                                 $this->viewUpdates();
 801                         }
 802                         wfProfileOut( __METHOD__ );
 803                         return;
 804                 }
 805
 806                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 807                         # User/User_talk subpages are not modified. (bug 11443)
 808                         if( !$this->mTitle->isSubpage() ) {
 809                                 $block = new Block();
 810                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 811                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 812                                 }
 813                         }
 814                 }
 815
 816                 # Should the parser cache be used?
 817                 $pcache = $this->useParserCache( $oldid );
 818                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 819                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 820                         wfIncrStats( 'pcache_miss_stub' );
 821                 }
 822
 823                 $wasRedirected = false;
 824                 if( isset( $this->mRedirectedFrom ) ) {
 825                         // This is an internally redirected page view.
 826                         // We'll need a backlink to the source page for navigation.
 827                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 828                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 829                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 830                                 $wgOut->setSubtitle( $s );
 831
 832                                 // Set the fragment if one was specified in the redirect
 833                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 834                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 835                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 836                                 }
 837                                 $wasRedirected = true;
 838                         }
 839                 } elseif( !empty( $rdfrom ) ) {
 840                         // This is an externally redirected view, from some other wiki.
 841                         // If it was reported from a trusted site, supply a backlink.
 842                         global $wgRedirectSources;
 843                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 844                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 845                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 846                                 $wgOut->setSubtitle( $s );
 847                                 $wasRedirected = true;
 848                         }
 849                 }
 850
 851                 $outputDone = false;
 852                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 853                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 854                         // Ensure that UI elements requiring revision ID have
 855                         // the correct version information.
 856                         $wgOut->setRevisionId( $this->mLatest );
 857                         $outputDone = true;
 858                 }
 859                 # Fetch content and check for errors
 860                 if( !$outputDone ) {
 861                         # If the article does not exist and was deleted, show the log
 862                         if( $this->getID() == 0 ) {
 863                                 $this->showDeletionLog();
 864                         }
 865                         $text = $this->getContent();
 866                         // For now, check also for ID until getContent actually returns
 867                         // false for pages that do not exists
 868                         if( $text === false || $this->getID() === 0 ) {
 869                                 # Failed to load, replace text with error message
 870                                 $t = $this->mTitle->getPrefixedText();
 871                                 if( $oldid ) {
 872                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 873                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 874                                 // Always use page content for pages in the MediaWiki namespace
 875                                 // since it contains the default message
 876                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 877                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 878                                 }
 879                         }
 880
 881                         # Non-existent pages
 882                         if( $this->getID() === 0 ) {
 883                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 884                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 885                                 if( !$this->hasViewableContent() ) {
 886                                         // If there's no backing content, send a 404 Not Found
 887                                         // for better machine handling of broken links.
 888                                         $return404 = true;
 889                                 }
 890                         }
 891
 892                         if( $return404 ) {
 893                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 894                         }
 895
 896                         # Another whitelist check in case oldid is altering the title
 897                         if( !$this->mTitle->userCanRead() ) {
 898                                 $wgOut->loginToUse();
 899                                 $wgOut->output();
 900                                 $wgOut->disable();
 901                                 wfProfileOut( __METHOD__ );
 902                                 return;
 903                         }
 904
 905                         # For ?curid=x urls, disallow indexing
 906                         if( $wgRequest->getInt('curid') )
 907                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 908
 909                         # We're looking at an old revision
 910                         if( !empty( $oldid ) ) {
 911                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 912                                 if( is_null( $this->mRevision ) ) {
 913                                         // FIXME: This would be a nice place to load the 'no such page' text.
 914                                 } else {
 915                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 916                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 917                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 918                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 919                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 920                                                         wfProfileOut( __METHOD__ );
 921                                                         return;
 922                                                 } else {
 923                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 924                                                         // and we are allowed to see...
 925                                                 }
 926                                         }
 927                                 }
 928                         }
 929
 930                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 931
 932                          // Pages containing custom CSS or JavaScript get special treatment
 933                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 934                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 935                                 // Give hooks a chance to customise the output
 936                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 937                                         // Wrap the whole lot in a <pre> and don't parse
 938                                         $m = array();
 939                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 940                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 941                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 942                                         $wgOut->addHTML( "\n</pre>\n" );
 943                                 }
 944                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 945                                 # Don't append the subtitle if this was an old revision
 946                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 947                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 948                                 $wgOut->addParserOutputNoText( $parseout );
 949                         } else if( $pcache ) {
 950                                 # Display content and save to parser cache
 951                                 $this->outputWikiText( $text );
 952                         } else {
 953                                 # Display content, don't attempt to save to parser cache
 954                                 # Don't show section-edit links on old revisions... this way lies madness.
 955                                 if( !$this->isCurrent() ) {
 956                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 957                                 }
 958                                 # Display content and don't save to parser cache
 959                                 # With timing hack -- TS 2006-07-26
 960                                 $time = -wfTime();
 961                                 $this->outputWikiText( $text, false );
 962                                 $time += wfTime();
 963
 964                                 # Timing hack
 965                                 if( $time > 3 ) {
 966                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 967                                                 $this->mTitle->getPrefixedDBkey()));
 968                                 }
 969
 970                                 if( !$this->isCurrent() ) {
 971                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 972                                 }
 973                         }
 974                 }
 975                 /* title may have been set from the cache */
 976                 $t = $wgOut->getPageTitle();
 977                 if( empty( $t ) ) {
 978                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 979
 980                         # For the main page, overwrite the <title> element with the con-
 981                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 982                         # that's not empty).
 983                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 984                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 985                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 986                         }
 987                 }
 988
 989                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 990                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 991                         $wgOut->addWikiMsg('anontalkpagetext');
 992                 }
 993
 994                 # Only diffs and new page links from RC give rcid params, so if
 995                 # we are just viewing the page normally with no rcid, try to find it.
 996                 # This is more convenient for users.
 997                 if( $this->mTitle->exists() && $this->mTitle->userCan('patrol', false) ) {
 998                         if( empty($rcid) ) {
 999                                 $firstRev = $this->mTitle->getFirstRevision();
1000                                 $rcid = $firstRev ? $firstRev->isUnpatrolled() : 0;
1001                         } else {
1002                                 $rc = RecentChange::newFromId( $rcid );
1003                                 // Already patrolled?
1004                                 $rcid = is_object($rc) && !$rc->getAttribute('rc_patrolled') ? $rcid : 0;
1005                         }
1006                 }
1007                 # If we have been passed an &rcid= parameter, we want to give the user a
1008                 # chance to mark this new article as patrolled.
1009                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->userCan('patrol', false) ) {
1010                         $wgOut->addHTML(
1011                                 "<div class='patrollink'>" .
1012                                         wfMsgHtml( 'markaspatrolledlink',
1013                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1014                                                 "action=markpatrolled&rcid=$rcid" )
1015                                         ) .
1016                                 '</div>'
1017                          );
1018                 }
1019
1020                 # Trackbacks
1021                 if( $wgUseTrackbacks ) {
1022                         $this->addTrackbacks();
1023                 }
1024
1025                 $this->viewUpdates();
1026                 wfProfileOut( __METHOD__ );
1027         }
1028
1029         protected function showDeletionLog() {
1030                 global $wgUser, $wgOut;
1031                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1032                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
1033                 if( $pager->getNumRows() > 0 ) {
1034                         $pager->mLimit = 10;
1035                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1036                         $wgOut->addWikiMsg( 'deleted-notice' );
1037                         $wgOut->addHTML(
1038                                 $loglist->beginLogEventsList() .
1039                                 $pager->getBody() .
1040                                 $loglist->endLogEventsList()
1041                         );
1042                         if( $pager->getNumRows() > 10 ) {
1043                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1044                                         SpecialPage::getTitleFor( 'Log' ),
1045                                         wfMsgHtml( 'deletelog-fulllog' ),
1046                                         array(),
1047                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
1048                                 ) );
1049                         }
1050                         $wgOut->addHTML( '</div>' );
1051                 }
1052         }
1053
1054         /*
1055         * Should the parser cache be used?
1056         */
1057         protected function useParserCache( $oldid ) {
1058                 global $wgUser, $wgEnableParserCache;
1059
1060                 return $wgEnableParserCache
1061                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1062                         && $this->exists()
1063                         && empty( $oldid )
1064                         && !$this->mTitle->isCssOrJsPage()
1065                         && !$this->mTitle->isCssJsSubpage();
1066         }
1067
1068         /**
1069          * View redirect
1070          * @param $target Title object or Array of destination(s) to redirect
1071          * @param $appendSubtitle Boolean [optional]
1072          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1073          */
1074         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1075                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1076                 # Display redirect
1077                 if( !is_array( $target ) ) {
1078                         $target = array( $target );
1079                 }
1080                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1081                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1082                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1083                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1084
1085                 if( $appendSubtitle ) {
1086                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1087                 }
1088                 $sk = $wgUser->getSkin();
1089                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1090                 $title = array_shift( $target );
1091                 if( $forceKnown ) {
1092                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1093                 } else {
1094                         $link = $sk->makeLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1095                 }
1096                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1097                 foreach( $target as $rt ) {
1098                         if( $forceKnown ) {
1099                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1100                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1101                         } else {
1102                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1103                                         . $sk->makeLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1104                         }
1105                 }
1106                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1107                         '<span class="redirectText">'.$link.'</span>';
1108
1109         }
1110
1111         public function addTrackbacks() {
1112                 global $wgOut, $wgUser;
1113                 $dbr = wfGetDB( DB_SLAVE );
1114                 $tbs = $dbr->select( 'trackbacks',
1115                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1116                         array('tb_page' => $this->getID() )
1117                 );
1118                 if( !$dbr->numRows($tbs) ) return;
1119
1120                 $tbtext = "";
1121                 while( $o = $dbr->fetchObject($tbs) ) {
1122                         $rmvtxt = "";
1123                         if( $wgUser->isAllowed( 'trackback' ) ) {
1124                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1125                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1126                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1127                         }
1128                         $tbtext .= "\n";
1129                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1130                                         $o->tb_title,
1131                                         $o->tb_url,
1132                                         $o->tb_ex,
1133                                         $o->tb_name,
1134                                         $rmvtxt);
1135                 }
1136                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1137                 $this->mTitle->invalidateCache();
1138         }
1139
1140         public function deletetrackback() {
1141                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1142                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1143                         $wgOut->addWikiMsg( 'sessionfailure' );
1144                         return;
1145                 }
1146
1147                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1148                 if( count($permission_errors) ) {
1149                         $wgOut->showPermissionsErrorPage( $permission_errors );
1150                         return;
1151                 }
1152
1153                 $db = wfGetDB( DB_MASTER );
1154                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1155
1156                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1157                 $this->mTitle->invalidateCache();
1158         }
1159
1160         public function render() {
1161                 global $wgOut;
1162                 $wgOut->setArticleBodyOnly(true);
1163                 $this->view();
1164         }
1165
1166         /**
1167          * Handle action=purge
1168          */
1169         public function purge() {
1170                 global $wgUser, $wgRequest, $wgOut;
1171                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1172                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1173                                 $this->doPurge();
1174                                 $this->view();
1175                         }
1176                 } else {
1177                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1178                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1179                         $form = "<form method=\"post\" action=\"$action\">\n" .
1180                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1181                                         "</form>\n";
1182                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1183                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1184                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1185                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1186                         $wgOut->addHTML( $top . $form . $bottom );
1187                 }
1188         }
1189
1190         /**
1191          * Perform the actions of a page purging
1192          */
1193         public function doPurge() {
1194                 global $wgUseSquid;
1195                 // Invalidate the cache
1196                 $this->mTitle->invalidateCache();
1197
1198                 if( $wgUseSquid ) {
1199                         // Commit the transaction before the purge is sent
1200                         $dbw = wfGetDB( DB_MASTER );
1201                         $dbw->immediateCommit();
1202
1203                         // Send purge
1204                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1205                         $update->doUpdate();
1206                 }
1207                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1208                         global $wgMessageCache;
1209                         if( $this->getID() == 0 ) {
1210                                 $text = false;
1211                         } else {
1212                                 $text = $this->getRawText();
1213                         }
1214                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1215                 }
1216         }
1217
1218         /**
1219          * Insert a new empty page record for this article.
1220          * This *must* be followed up by creating a revision
1221          * and running $this->updateToLatest( $rev_id );
1222          * or else the record will be left in a funky state.
1223          * Best if all done inside a transaction.
1224          *
1225          * @param $dbw Database
1226          * @return int The newly created page_id key, or false if the title already existed
1227          * @private
1228          */
1229         public function insertOn( $dbw ) {
1230                 wfProfileIn( __METHOD__ );
1231
1232                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1233                 $dbw->insert( 'page', array(
1234                         'page_id'           => $page_id,
1235                         'page_namespace'    => $this->mTitle->getNamespace(),
1236                         'page_title'        => $this->mTitle->getDBkey(),
1237                         'page_counter'      => 0,
1238                         'page_restrictions' => '',
1239                         'page_is_redirect'  => 0, # Will set this shortly...
1240                         'page_is_new'       => 1,
1241                         'page_random'       => wfRandom(),
1242                         'page_touched'      => $dbw->timestamp(),
1243                         'page_latest'       => 0, # Fill this in shortly...
1244                         'page_len'          => 0, # Fill this in shortly...
1245                 ), __METHOD__, 'IGNORE' );
1246
1247                 $affected = $dbw->affectedRows();
1248                 if( $affected ) {
1249                         $newid = $dbw->insertId();
1250                         $this->mTitle->resetArticleId( $newid );
1251                 }
1252                 wfProfileOut( __METHOD__ );
1253                 return $affected ? $newid : false;
1254         }
1255
1256         /**
1257          * Update the page record to point to a newly saved revision.
1258          *
1259          * @param $dbw Database object
1260          * @param $revision Revision: For ID number, and text used to set
1261                             length and redirect status fields
1262          * @param $lastRevision Integer: if given, will not overwrite the page field
1263          *                      when different from the currently set value.
1264          *                      Giving 0 indicates the new page flag should be set
1265          *                      on.
1266          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1267          *                                                       removing rows in redirect table.
1268          * @return bool true on success, false on failure
1269          * @private
1270          */
1271         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1272                 wfProfileIn( __METHOD__ );
1273
1274                 $text = $revision->getText();
1275                 $rt = Title::newFromRedirect( $text );
1276
1277                 $conditions = array( 'page_id' => $this->getId() );
1278                 if( !is_null( $lastRevision ) ) {
1279                         # An extra check against threads stepping on each other
1280                         $conditions['page_latest'] = $lastRevision;
1281                 }
1282
1283                 $dbw->update( 'page',
1284                         array( /* SET */
1285                                 'page_latest'      => $revision->getId(),
1286                                 'page_touched'     => $dbw->timestamp(),
1287                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1288                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1289                                 'page_len'         => strlen( $text ),
1290                         ),
1291                         $conditions,
1292                         __METHOD__ );
1293
1294                 $result = $dbw->affectedRows() != 0;
1295                 if( $result ) {
1296                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1297                 }
1298
1299                 wfProfileOut( __METHOD__ );
1300                 return $result;
1301         }
1302
1303         /**
1304          * Add row to the redirect table if this is a redirect, remove otherwise.
1305          *
1306          * @param $dbw Database
1307          * @param $redirectTitle a title object pointing to the redirect target,
1308          *                                               or NULL if this is not a redirect
1309          * @param $lastRevIsRedirect If given, will optimize adding and
1310          *                                                       removing rows in redirect table.
1311          * @return bool true on success, false on failure
1312          * @private
1313          */
1314         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1315                 // Always update redirects (target link might have changed)
1316                 // Update/Insert if we don't know if the last revision was a redirect or not
1317                 // Delete if changing from redirect to non-redirect
1318                 $isRedirect = !is_null($redirectTitle);
1319                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1320                         wfProfileIn( __METHOD__ );
1321                         if( $isRedirect ) {
1322                                 // This title is a redirect, Add/Update row in the redirect table
1323                                 $set = array( /* SET */
1324                                         'rd_namespace' => $redirectTitle->getNamespace(),
1325                                         'rd_title'     => $redirectTitle->getDBkey(),
1326                                         'rd_from'      => $this->getId(),
1327                                 );
1328                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1329                         } else {
1330                                 // This is not a redirect, remove row from redirect table
1331                                 $where = array( 'rd_from' => $this->getId() );
1332                                 $dbw->delete( 'redirect', $where, __METHOD__);
1333                         }
1334                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1335                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1336                         }
1337                         wfProfileOut( __METHOD__ );
1338                         return ( $dbw->affectedRows() != 0 );
1339                 }
1340                 return true;
1341         }
1342
1343         /**
1344          * If the given revision is newer than the currently set page_latest,
1345          * update the page record. Otherwise, do nothing.
1346          *
1347          * @param $dbw Database object
1348          * @param $revision Revision object
1349          */
1350         public function updateIfNewerOn( &$dbw, $revision ) {
1351                 wfProfileIn( __METHOD__ );
1352                 $row = $dbw->selectRow(
1353                         array( 'revision', 'page' ),
1354                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1355                         array(
1356                                 'page_id' => $this->getId(),
1357                                 'page_latest=rev_id' ),
1358                         __METHOD__ );
1359                 if( $row ) {
1360                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1361                                 wfProfileOut( __METHOD__ );
1362                                 return false;
1363                         }
1364                         $prev = $row->rev_id;
1365                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1366                 } else {
1367                         # No or missing previous revision; mark the page as new
1368                         $prev = 0;
1369                         $lastRevIsRedirect = null;
1370                 }
1371                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1372                 wfProfileOut( __METHOD__ );
1373                 return $ret;
1374         }
1375
1376         /**
1377          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1378          * @return string Complete article text, or null if error
1379          */
1380         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1381                 wfProfileIn( __METHOD__ );
1382                 if( strval( $section ) == '' ) {
1383                         // Whole-page edit; let the whole text through
1384                 } else {
1385                         if( is_null($edittime) ) {
1386                                 $rev = Revision::newFromTitle( $this->mTitle );
1387                         } else {
1388                                 $dbw = wfGetDB( DB_MASTER );
1389                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1390                         }
1391                         if( !$rev ) {
1392                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1393                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1394                                 return null;
1395                         }
1396                         $oldtext = $rev->getText();
1397
1398                         if( $section == 'new' ) {
1399                                 # Inserting a new section
1400                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1401                                 $text = strlen( trim( $oldtext ) ) > 0
1402                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1403                                                 : "{$subject}{$text}";
1404                         } else {
1405                                 # Replacing an existing section; roll out the big guns
1406                                 global $wgParser;
1407                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1408                         }
1409                 }
1410                 wfProfileOut( __METHOD__ );
1411                 return $text;
1412         }
1413
1414         /**
1415          * @deprecated use Article::doEdit()
1416          */
1417         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1418                 wfDeprecated( __METHOD__ );
1419                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1420                         ( $isminor ? EDIT_MINOR : 0 ) |
1421                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1422                         ( $bot ? EDIT_FORCE_BOT : 0 );
1423
1424                 # If this is a comment, add the summary as headline
1425                 if( $comment && $summary != "" ) {
1426                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1427                 }
1428
1429                 $this->doEdit( $text, $summary, $flags );
1430
1431                 $dbw = wfGetDB( DB_MASTER );
1432                 if($watchthis) {
1433                         if(!$this->mTitle->userIsWatching()) {
1434                                 $dbw->begin();
1435                                 $this->doWatch();
1436                                 $dbw->commit();
1437                         }
1438                 } else {
1439                         if( $this->mTitle->userIsWatching() ) {
1440                                 $dbw->begin();
1441                                 $this->doUnwatch();
1442                                 $dbw->commit();
1443                         }
1444                 }
1445                 $this->doRedirect( $this->isRedirect( $text ) );
1446         }
1447
1448         /**
1449          * @deprecated use Article::doEdit()
1450          */
1451         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1452                 wfDeprecated( __METHOD__ );
1453                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1454                         ( $minor ? EDIT_MINOR : 0 ) |
1455                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1456
1457                 $status = $this->doEdit( $text, $summary, $flags );
1458                 if( !$status->isOK() ) {
1459                         return false;
1460                 }
1461
1462                 $dbw = wfGetDB( DB_MASTER );
1463                 if( $watchthis ) {
1464                         if(!$this->mTitle->userIsWatching()) {
1465                                 $dbw->begin();
1466                                 $this->doWatch();
1467                                 $dbw->commit();
1468                         }
1469                 } else {
1470                         if( $this->mTitle->userIsWatching() ) {
1471                                 $dbw->begin();
1472                                 $this->doUnwatch();
1473                                 $dbw->commit();
1474                         }
1475                 }
1476
1477                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1478                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1479
1480                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1481                 return true;
1482         }
1483
1484         /**
1485          * Article::doEdit()
1486          *
1487          * Change an existing article or create a new article. Updates RC and all necessary caches,
1488          * optionally via the deferred update array.
1489          *
1490          * $wgUser must be set before calling this function.
1491          *
1492          * @param $text String: new text
1493          * @param $summary String: edit summary
1494          * @param $flags Integer bitfield:
1495          *      EDIT_NEW
1496          *          Article is known or assumed to be non-existent, create a new one
1497          *      EDIT_UPDATE
1498          *          Article is known or assumed to be pre-existing, update it
1499          *      EDIT_MINOR
1500          *          Mark this edit minor, if the user is allowed to do so
1501          *      EDIT_SUPPRESS_RC
1502          *          Do not log the change in recentchanges
1503          *      EDIT_FORCE_BOT
1504          *          Mark the edit a "bot" edit regardless of user rights
1505          *      EDIT_DEFER_UPDATES
1506          *          Defer some of the updates until the end of index.php
1507          *      EDIT_AUTOSUMMARY
1508          *          Fill in blank summaries with generated text where possible
1509          *
1510          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1511          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1512          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1513          * edit-already-exists error will be returned. These two conditions are also possible with
1514          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1515          *
1516          * @param $baseRevId the revision ID this edit was based off, if any
1517          * @param $user Optional user object, $wgUser will be used if not passed
1518          *
1519          * @return Status object. Possible errors:
1520          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1521          *     edit-gone-missing:       In update mode, but the article didn't exist
1522          *     edit-conflict:           In update mode, the article changed unexpectedly
1523          *     edit-no-change:          Warning that the text was the same as before
1524          *     edit-already-exists:     In creation mode, but the article already exists
1525          *
1526          *  Extensions may define additional errors.
1527          *
1528          *  $return->value will contain an associative array with members as follows:
1529          *     new:                     Boolean indicating if the function attempted to create a new article
1530          *     revision:                The revision object for the inserted revision, or null
1531          *
1532          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1533          */
1534         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1535                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1536
1537                 # Low-level sanity check
1538                 if( $this->mTitle->getText() == '' ) {
1539                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1540                 }
1541
1542                 wfProfileIn( __METHOD__ );
1543
1544                 $user = is_null($user) ? $wgUser : $user;
1545                 $status = Status::newGood( array() );
1546
1547                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1548                 $this->loadPageData();
1549
1550                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1551                         $aid = $this->mTitle->getArticleID();
1552                         if( $aid ) {
1553                                 $flags |= EDIT_UPDATE;
1554                         } else {
1555                                 $flags |= EDIT_NEW;
1556                         }
1557                 }
1558
1559                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1560                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1561                 {
1562                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1563                         wfProfileOut( __METHOD__ );
1564                         if( $status->isOK() ) {
1565                                 $status->fatal( 'edit-hook-aborted');
1566                         }
1567                         return $status;
1568                 }
1569
1570                 # Silently ignore EDIT_MINOR if not allowed
1571                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1572                 $bot = $flags & EDIT_FORCE_BOT;
1573
1574                 $oldtext = $this->getRawText(); // current revision
1575                 $oldsize = strlen( $oldtext );
1576
1577                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1578                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1579                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1580                 }
1581
1582                 $editInfo = $this->prepareTextForEdit( $text );
1583                 $text = $editInfo->pst;
1584                 $newsize = strlen( $text );
1585
1586                 $dbw = wfGetDB( DB_MASTER );
1587                 $now = wfTimestampNow();
1588
1589                 if( $flags & EDIT_UPDATE ) {
1590                         # Update article, but only if changed.
1591                         $status->value['new'] = false;
1592                         # Make sure the revision is either completely inserted or not inserted at all
1593                         if( !$wgDBtransactions ) {
1594                                 $userAbort = ignore_user_abort( true );
1595                         }
1596
1597                         $revisionId = 0;
1598
1599                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1600
1601                         if( $changed ) {
1602                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1603                                   - (int)$this->isCountable( $oldtext );
1604                                 $this->mTotalAdjustment = 0;
1605
1606                                 if( !$this->mLatest ) {
1607                                         # Article gone missing
1608                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1609                                         $status->fatal( 'edit-gone-missing' );
1610                                         wfProfileOut( __METHOD__ );
1611                                         return $status;
1612                                 }
1613
1614                                 $revision = new Revision( array(
1615                                         'page'       => $this->getId(),
1616                                         'comment'    => $summary,
1617                                         'minor_edit' => $isminor,
1618                                         'text'       => $text,
1619                                         'parent_id'  => $this->mLatest,
1620                                         'user'       => $user->getId(),
1621                                         'user_text'  => $user->getName(),
1622                                         ) );
1623
1624                                 $dbw->begin();
1625                                 $revisionId = $revision->insertOn( $dbw );
1626
1627                                 # Update page
1628                                 #
1629                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1630                                 # during the course of this function. This makes sure that EditPage can detect
1631                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1632                                 # before this function is called. A previous function used a separate query, this
1633                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1634                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1635
1636                                 if( !$ok ) {
1637                                         /* Belated edit conflict! Run away!! */
1638                                         $status->fatal( 'edit-conflict' );
1639                                         # Delete the invalid revision if the DB is not transactional
1640                                         if( !$wgDBtransactions ) {
1641                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1642                                         }
1643                                         $revisionId = 0;
1644                                         $dbw->rollback();
1645                                 } else {
1646                                         global $wgUseRCPatrol;
1647                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1648                                         # Update recentchanges
1649                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1650                                                 # Mark as patrolled if the user can do so
1651                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1652                                                 # Add RC row to the DB
1653                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1654                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1655                                                         $revisionId, $patrolled
1656                                                 );
1657                                                 # Log auto-patrolled edits
1658                                                 if( $patrolled ) {
1659                                                         PatrolLog::record( $rc, true );
1660                                                 }
1661                                         }
1662                                         $user->incEditCount();
1663                                         $dbw->commit();
1664                                 }
1665                         } else {
1666                                 $status->warning( 'edit-no-change' );
1667                                 $revision = null;
1668                                 // Keep the same revision ID, but do some updates on it
1669                                 $revisionId = $this->getRevIdFetched();
1670                                 // Update page_touched, this is usually implicit in the page update
1671                                 // Other cache updates are done in onArticleEdit()
1672                                 $this->mTitle->invalidateCache();
1673                         }
1674
1675                         if( !$wgDBtransactions ) {
1676                                 ignore_user_abort( $userAbort );
1677                         }
1678                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1679                         if( !$status->isOK() ) {
1680                                 wfProfileOut( __METHOD__ );
1681                                 return $status;
1682                         }
1683
1684                         # Invalidate cache of this article and all pages using this article
1685                         # as a template. Partly deferred. Leave templatelinks for editUpdates().
1686                         Article::onArticleEdit( $this->mTitle, 'skiptransclusions' );
1687                         # Update links tables, site stats, etc.
1688                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1689                 } else {
1690                         # Create new article
1691                         $status->value['new'] = true;
1692
1693                         # Set statistics members
1694                         # We work out if it's countable after PST to avoid counter drift
1695                         # when articles are created with {{subst:}}
1696                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1697                         $this->mTotalAdjustment = 1;
1698
1699                         $dbw->begin();
1700
1701                         # Add the page record; stake our claim on this title!
1702                         # This will return false if the article already exists
1703                         $newid = $this->insertOn( $dbw );
1704
1705                         if( $newid === false ) {
1706                                 $dbw->rollback();
1707                                 $status->fatal( 'edit-already-exists' );
1708                                 wfProfileOut( __METHOD__ );
1709                                 return $status;
1710                         }
1711
1712                         # Save the revision text...
1713                         $revision = new Revision( array(
1714                                 'page'       => $newid,
1715                                 'comment'    => $summary,
1716                                 'minor_edit' => $isminor,
1717                                 'text'       => $text,
1718                                 'user'       => $user->getId(),
1719                                 'user_text'  => $user->getName(),
1720                                 ) );
1721                         $revisionId = $revision->insertOn( $dbw );
1722
1723                         $this->mTitle->resetArticleID( $newid );
1724
1725                         # Update the page record with revision data
1726                         $this->updateRevisionOn( $dbw, $revision, 0 );
1727
1728                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1729                         # Update recentchanges
1730                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1731                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1732                                 # Mark as patrolled if the user can do so
1733                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1734                                 # Add RC row to the DB
1735                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1736                                         '', strlen($text), $revisionId, $patrolled );
1737                                 # Log auto-patrolled edits
1738                                 if( $patrolled ) {
1739                                         PatrolLog::record( $rc, true );
1740                                 }
1741                         }
1742                         $user->incEditCount();
1743                         $dbw->commit();
1744
1745                         # Update links, etc.
1746                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1747
1748                         # Clear caches
1749                         Article::onArticleCreate( $this->mTitle );
1750
1751                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1752                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1753                 }
1754
1755                 # Do updates right now unless deferral was requested
1756                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1757                         wfDoUpdates();
1758                 }
1759
1760                 // Return the new revision (or null) to the caller
1761                 $status->value['revision'] = $revision;
1762
1763                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1764                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1765
1766                 wfProfileOut( __METHOD__ );
1767                 return $status;
1768         }
1769
1770         /**
1771          * @deprecated wrapper for doRedirect
1772          */
1773         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1774                 wfDeprecated( __METHOD__ );
1775                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1776         }
1777
1778         /**
1779          * Output a redirect back to the article.
1780          * This is typically used after an edit.
1781          *
1782          * @param $noRedir Boolean: add redirect=no
1783          * @param $sectionAnchor String: section to redirect to, including "#"
1784          * @param $extraQuery String: extra query params
1785          */
1786         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1787                 global $wgOut;
1788                 if( $noRedir ) {
1789                         $query = 'redirect=no';
1790                         if( $extraQuery )
1791                                 $query .= "&$query";
1792                 } else {
1793                         $query = $extraQuery;
1794                 }
1795                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1796         }
1797
1798         /**
1799          * Mark this particular edit/page as patrolled
1800          */
1801         public function markpatrolled() {
1802                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1803                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1804
1805                 # If we haven't been given an rc_id value, we can't do anything
1806                 $rcid = (int) $wgRequest->getVal('rcid');
1807                 $rc = RecentChange::newFromId($rcid);
1808                 if( is_null($rc) ) {
1809                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1810                         return;
1811                 }
1812
1813                 #It would be nice to see where the user had actually come from, but for now just guess
1814                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1815                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1816
1817                 $dbw = wfGetDB( DB_MASTER );
1818                 $errors = $rc->doMarkPatrolled();
1819
1820                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1821                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1822                         return;
1823                 }
1824
1825                 if( in_array(array('hookaborted'), $errors) ) {
1826                         // The hook itself has handled any output
1827                         return;
1828                 }
1829
1830                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1831                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1832                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1833                         $wgOut->returnToMain( false, $return );
1834                         return;
1835                 }
1836
1837                 if( !empty($errors) ) {
1838                         $wgOut->showPermissionsErrorPage( $errors );
1839                         return;
1840                 }
1841
1842                 # Inform the user
1843                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1844                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1845                 $wgOut->returnToMain( false, $return );
1846         }
1847
1848         /**
1849          * User-interface handler for the "watch" action
1850          */
1851
1852         public function watch() {
1853                 global $wgUser, $wgOut;
1854                 if( $wgUser->isAnon() ) {
1855                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1856                         return;
1857                 }
1858                 if( wfReadOnly() ) {
1859                         $wgOut->readOnlyPage();
1860                         return;
1861                 }
1862                 if( $this->doWatch() ) {
1863                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1864                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1865                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1866                 }
1867                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1868         }
1869
1870         /**
1871          * Add this page to $wgUser's watchlist
1872          * @return bool true on successful watch operation
1873          */
1874         public function doWatch() {
1875                 global $wgUser;
1876                 if( $wgUser->isAnon() ) {
1877                         return false;
1878                 }
1879                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1880                         $wgUser->addWatch( $this->mTitle );
1881                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1882                 }
1883                 return false;
1884         }
1885
1886         /**
1887          * User interface handler for the "unwatch" action.
1888          */
1889         public function unwatch() {
1890                 global $wgUser, $wgOut;
1891                 if( $wgUser->isAnon() ) {
1892                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1893                         return;
1894                 }
1895                 if( wfReadOnly() ) {
1896                         $wgOut->readOnlyPage();
1897                         return;
1898                 }
1899                 if( $this->doUnwatch() ) {
1900                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1901                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1902                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1903                 }
1904                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1905         }
1906
1907         /**
1908          * Stop watching a page
1909          * @return bool true on successful unwatch
1910          */
1911         public function doUnwatch() {
1912                 global $wgUser;
1913                 if( $wgUser->isAnon() ) {
1914                         return false;
1915                 }
1916                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1917                         $wgUser->removeWatch( $this->mTitle );
1918                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1919                 }
1920                 return false;
1921         }
1922
1923         /**
1924          * action=protect handler
1925          */
1926         public function protect() {
1927                 $form = new ProtectionForm( $this );
1928                 $form->execute();
1929         }
1930
1931         /**
1932          * action=unprotect handler (alias)
1933          */
1934         public function unprotect() {
1935                 $this->protect();
1936         }
1937
1938         /**
1939          * Update the article's restriction field, and leave a log entry.
1940          *
1941          * @param $limit Array: set of restriction keys
1942          * @param $reason String
1943          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1944          * @param $expiry Array: per restriction type expiration
1945          * @return bool true on success
1946          */
1947         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1948                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1949
1950                 $id = $this->mTitle->getArticleID();
1951                 if( $id <= 0 || wfReadOnly() || !$this->mTitle->userCan('protect') ) {
1952                         return false;
1953                 }
1954
1955                 if( !$cascade ) {
1956                         $cascade = false;
1957                 }
1958
1959                 // Take this opportunity to purge out expired restrictions
1960                 Title::purgeExpiredRestrictions();
1961
1962                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1963                 # we expect a single selection, but the schema allows otherwise.
1964                 $current = array();
1965                 $updated = Article::flattenRestrictions( $limit );
1966                 $changed = false;
1967                 foreach( $wgRestrictionTypes as $action ) {
1968                         if( isset( $expiry[$action] ) ) {
1969                                 # Get current restrictions on $action
1970                                 $aLimits = $this->mTitle->getRestrictions( $action );
1971                                 $current[$action] = implode( '', $aLimits );
1972                                 # Are any actual restrictions being dealt with here?
1973                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1974                                 # If something changed, we need to log it. Checking $aRChanged
1975                                 # assures that "unprotecting" a page that is not protected does
1976                                 # not log just because the expiry was "changed".
1977                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1978                                         $changed = true;
1979                                 }
1980                         }
1981                 }
1982
1983                 $current = Article::flattenRestrictions( $current );
1984
1985                 $changed = ($changed || $current != $updated );
1986                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1987                 $protect = ( $updated != '' );
1988
1989                 # If nothing's changed, do nothing
1990                 if( $changed ) {
1991                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1992
1993                                 $dbw = wfGetDB( DB_MASTER );
1994
1995                                 # Prepare a null revision to be added to the history
1996                                 $modified = $current != '' && $protect;
1997                                 if( $protect ) {
1998                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1999                                 } else {
2000                                         $comment_type = 'unprotectedarticle';
2001                                 }
2002                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2003
2004                                 # Only restrictions with the 'protect' right can cascade...
2005                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2006                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2007                                 # The schema allows multiple restrictions
2008                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2009                                         $cascade = false;
2010                                 $cascade_description = '';
2011                                 if( $cascade ) {
2012                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2013                                 }
2014
2015                                 if( $reason )
2016                                         $comment .= ": $reason";
2017
2018                                 $editComment = $comment;
2019                                 $encodedExpiry = array();
2020                                 $protect_description = '';
2021                                 foreach( $limit as $action => $restrictions  ) {
2022                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2023                                         if( $restrictions != '' ) {
2024                                                 $protect_description .= "[$action=$restrictions] (";
2025                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2026                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2027                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2028                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2029                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2030                                                 } else {
2031                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2032                                                 }
2033                                                 $protect_description .= ') ';
2034                                         }
2035                                 }
2036                                 $protect_description = trim($protect_description);
2037
2038                                 if( $protect_description && $protect )
2039                                         $editComment .= " ($protect_description)";
2040                                 if( $cascade )
2041                                         $editComment .= "$cascade_description";
2042                                 # Update restrictions table
2043                                 foreach( $limit as $action => $restrictions ) {
2044                                         if($restrictions != '' ) {
2045                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2046                                                         array( 'pr_page' => $id,
2047                                                                 'pr_type' => $action,
2048                                                                 'pr_level' => $restrictions,
2049                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2050                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2051                                         } else {
2052                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2053                                                         'pr_type' => $action ), __METHOD__ );
2054                                         }
2055                                 }
2056
2057                                 # Insert a null revision
2058                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2059                                 $nullRevId = $nullRevision->insertOn( $dbw );
2060
2061                                 $latest = $this->getLatest();
2062                                 # Update page record
2063                                 $dbw->update( 'page',
2064                                         array( /* SET */
2065                                                 'page_touched' => $dbw->timestamp(),
2066                                                 'page_restrictions' => '',
2067                                                 'page_latest' => $nullRevId
2068                                         ), array( /* WHERE */
2069                                                 'page_id' => $id
2070                                         ), 'Article::protect'
2071                                 );
2072
2073                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2074                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2075
2076                                 # Update the protection log
2077                                 $log = new LogPage( 'protect' );
2078                                 if( $protect ) {
2079                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2080                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2081                                 } else {
2082                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2083                                 }
2084
2085                         } # End hook
2086                 } # End "changed" check
2087
2088                 return true;
2089         }
2090
2091         /**
2092          * Take an array of page restrictions and flatten it to a string
2093          * suitable for insertion into the page_restrictions field.
2094          * @param $limit Array
2095          * @return String
2096          */
2097         protected static function flattenRestrictions( $limit ) {
2098                 if( !is_array( $limit ) ) {
2099                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2100                 }
2101                 $bits = array();
2102                 ksort( $limit );
2103                 foreach( $limit as $action => $restrictions ) {
2104                         if( $restrictions != '' ) {
2105                                 $bits[] = "$action=$restrictions";
2106                         }
2107                 }
2108                 return implode( ':', $bits );
2109         }
2110
2111         /**
2112          * Auto-generates a deletion reason
2113          * @param &$hasHistory Boolean: whether the page has a history
2114          */
2115         public function generateReason( &$hasHistory ) {
2116                 global $wgContLang;
2117                 $dbw = wfGetDB( DB_MASTER );
2118                 // Get the last revision
2119                 $rev = Revision::newFromTitle( $this->mTitle );
2120                 if( is_null( $rev ) )
2121                         return false;
2122
2123                 // Get the article's contents
2124                 $contents = $rev->getText();
2125                 $blank = false;
2126                 // If the page is blank, use the text from the previous revision,
2127                 // which can only be blank if there's a move/import/protect dummy revision involved
2128                 if( $contents == '' ) {
2129                         $prev = $rev->getPrevious();
2130                         if( $prev )     {
2131                                 $contents = $prev->getText();
2132                                 $blank = true;
2133                         }
2134                 }
2135
2136                 // Find out if there was only one contributor
2137                 // Only scan the last 20 revisions
2138                 $limit = 20;
2139                 $res = $dbw->select( 'revision', 'rev_user_text',
2140                         array( 'rev_page' => $this->getID() ), __METHOD__,
2141                         array( 'LIMIT' => $limit )
2142                 );
2143                 if( $res === false )
2144                         // This page has no revisions, which is very weird
2145                         return false;
2146                 if( $res->numRows() > 1 )
2147                                 $hasHistory = true;
2148                 else
2149                                 $hasHistory = false;
2150                 $row = $dbw->fetchObject( $res );
2151                 $onlyAuthor = $row->rev_user_text;
2152                 // Try to find a second contributor
2153                 foreach( $res as $row ) {
2154                         if( $row->rev_user_text != $onlyAuthor ) {
2155                                 $onlyAuthor = false;
2156                                 break;
2157                         }
2158                 }
2159                 $dbw->freeResult( $res );
2160
2161                 // Generate the summary with a '$1' placeholder
2162                 if( $blank ) {
2163                         // The current revision is blank and the one before is also
2164                         // blank. It's just not our lucky day
2165                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2166                 } else {
2167                         if( $onlyAuthor )
2168                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2169                         else
2170                                 $reason = wfMsgForContent( 'excontent', '$1' );
2171                 }
2172
2173                 if( $reason == '-' ) {
2174                         // Allow these UI messages to be blanked out cleanly
2175                         return '';
2176                 }
2177
2178                 // Replace newlines with spaces to prevent uglyness
2179                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2180                 // Calculate the maximum amount of chars to get
2181                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2182                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2183                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2184                 // Remove possible unfinished links
2185                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2186                 // Now replace the '$1' placeholder
2187                 $reason = str_replace( '$1', $contents, $reason );
2188                 return $reason;
2189         }
2190
2191
2192         /*
2193          * UI entry point for page deletion
2194          */
2195         public function delete() {
2196                 global $wgUser, $wgOut, $wgRequest;
2197
2198                 $confirm = $wgRequest->wasPosted() &&
2199                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2200
2201                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2202                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2203
2204                 $reason = $this->DeleteReasonList;
2205
2206                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2207                         // Entry from drop down menu + additional comment
2208                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2209                 } elseif( $reason == 'other' ) {
2210                         $reason = $this->DeleteReason;
2211                 }
2212                 # Flag to hide all contents of the archived revisions
2213                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2214
2215                 # This code desperately needs to be totally rewritten
2216
2217                 # Read-only check...
2218                 if( wfReadOnly() ) {
2219                         $wgOut->readOnlyPage();
2220                         return;
2221                 }
2222
2223                 # Check permissions
2224                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2225
2226                 if( count( $permission_errors ) > 0 ) {
2227                         $wgOut->showPermissionsErrorPage( $permission_errors );
2228                         return;
2229                 }
2230
2231                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2232
2233                 # Better double-check that it hasn't been deleted yet!
2234                 $dbw = wfGetDB( DB_MASTER );
2235                 $conds = $this->mTitle->pageCond();
2236                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2237                 if( $latest === false ) {
2238                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2239                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2240                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2241                         return;
2242                 }
2243
2244                 # Hack for big sites
2245                 $bigHistory = $this->isBigDeletion();
2246                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2247                         global $wgLang, $wgDeleteRevisionsLimit;
2248                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2249                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2250                         return;
2251                 }
2252
2253                 if( $confirm ) {
2254                         $this->doDelete( $reason, $suppress );
2255                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2256                                 $this->doWatch();
2257                         } elseif( $this->mTitle->userIsWatching() ) {
2258                                 $this->doUnwatch();
2259                         }
2260                         return;
2261                 }
2262
2263                 // Generate deletion reason
2264                 $hasHistory = false;
2265                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2266
2267                 // If the page has a history, insert a warning
2268                 if( $hasHistory && !$confirm ) {
2269                         $skin = $wgUser->getSkin();
2270                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2271                         if( $bigHistory ) {
2272                                 global $wgLang, $wgDeleteRevisionsLimit;
2273                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2274                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2275                         }
2276                 }
2277
2278                 return $this->confirmDelete( $reason );
2279         }
2280
2281         /**
2282          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2283          */
2284         public function isBigDeletion() {
2285                 global $wgDeleteRevisionsLimit;
2286                 if( $wgDeleteRevisionsLimit ) {
2287                         $revCount = $this->estimateRevisionCount();
2288                         return $revCount > $wgDeleteRevisionsLimit;
2289                 }
2290                 return false;
2291         }
2292
2293         /**
2294          * @return int approximate revision count
2295          */
2296         public function estimateRevisionCount() {
2297                 $dbr = wfGetDB( DB_SLAVE );
2298                 // For an exact count...
2299                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2300                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2301                 return $dbr->estimateRowCount( 'revision', '*',
2302                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2303         }
2304
2305         /**
2306          * Get the last N authors
2307          * @param $num Integer: number of revisions to get
2308          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2309          * @return array Array of authors, duplicates not removed
2310          */
2311         public function getLastNAuthors( $num, $revLatest = 0 ) {
2312                 wfProfileIn( __METHOD__ );
2313                 // First try the slave
2314                 // If that doesn't have the latest revision, try the master
2315                 $continue = 2;
2316                 $db = wfGetDB( DB_SLAVE );
2317                 do {
2318                         $res = $db->select( array( 'page', 'revision' ),
2319                                 array( 'rev_id', 'rev_user_text' ),
2320                                 array(
2321                                         'page_namespace' => $this->mTitle->getNamespace(),
2322                                         'page_title' => $this->mTitle->getDBkey(),
2323                                         'rev_page = page_id'
2324                                 ), __METHOD__, $this->getSelectOptions( array(
2325                                         'ORDER BY' => 'rev_timestamp DESC',
2326                                         'LIMIT' => $num
2327                                 ) )
2328                         );
2329                         if( !$res ) {
2330                                 wfProfileOut( __METHOD__ );
2331                                 return array();
2332                         }
2333                         $row = $db->fetchObject( $res );
2334                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2335                                 $db = wfGetDB( DB_MASTER );
2336                                 $continue--;
2337                         } else {
2338                                 $continue = 0;
2339                         }
2340                 } while ( $continue );
2341
2342                 $authors = array( $row->rev_user_text );
2343                 while ( $row = $db->fetchObject( $res ) ) {
2344                         $authors[] = $row->rev_user_text;
2345                 }
2346                 wfProfileOut( __METHOD__ );
2347                 return $authors;
2348         }
2349
2350         /**
2351          * Output deletion confirmation dialog
2352          * @param $reason String: prefilled reason
2353          */
2354         public function confirmDelete( $reason ) {
2355                 global $wgOut, $wgUser;
2356
2357                 wfDebug( "Article::confirmDelete\n" );
2358
2359                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2360                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2361                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2362
2363                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2364                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2365                                         <td></td>
2366                                         <td class='mw-input'>" .
2367                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2368                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2369                                         "</td>
2370                                 </tr>";
2371                 } else {
2372                         $suppress = '';
2373                 }
2374                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2375
2376                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2377                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2378                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2379                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2380                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2381                         "<tr id=\"wpDeleteReasonListRow\">
2382                                 <td class='mw-label'>" .
2383                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2384                                 "</td>
2385                                 <td class='mw-input'>" .
2386                                         Xml::listDropDown( 'wpDeleteReasonList',
2387                                                 wfMsgForContent( 'deletereason-dropdown' ),
2388                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2389                                 "</td>
2390                         </tr>
2391                         <tr id=\"wpDeleteReasonRow\">
2392                                 <td class='mw-label'>" .
2393                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2394                                 "</td>
2395                                 <td class='mw-input'>" .
2396                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2397                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2398                                 "</td>
2399                         </tr>
2400                         <tr>
2401                                 <td></td>
2402                                 <td class='mw-input'>" .
2403                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2404                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2405                                 "</td>
2406                         </tr>
2407                         $suppress
2408                         <tr>
2409                                 <td></td>
2410                                 <td class='mw-submit'>" .
2411                                         Xml::submitButton( wfMsg( 'deletepage' ),
2412                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2413                                 "</td>
2414                         </tr>" .
2415                         Xml::closeElement( 'table' ) .
2416                         Xml::closeElement( 'fieldset' ) .
2417                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2418                         Xml::closeElement( 'form' );
2419
2420                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2421                                 $skin = $wgUser->getSkin();
2422                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2423                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2424                         }
2425
2426                 $wgOut->addHTML( $form );
2427                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2428         }
2429
2430         /**
2431          * Perform a deletion and output success or failure messages
2432          */
2433         public function doDelete( $reason, $suppress = false ) {
2434                 global $wgOut, $wgUser;
2435                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2436
2437                 $error = '';
2438                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2439                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2440                                 $deleted = $this->mTitle->getPrefixedText();
2441
2442                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2443                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2444
2445                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2446
2447                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2448                                 $wgOut->returnToMain( false );
2449                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2450                         } else {
2451                                 if( $error == '' ) {
2452                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2453                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2454                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2455                                 } else {
2456                                         $wgOut->showFatalError( $error );
2457                                 }
2458                         }
2459                 }
2460         }
2461
2462         /**
2463          * Back-end article deletion
2464          * Deletes the article with database consistency, writes logs, purges caches
2465          * Returns success
2466          */
2467         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2468                 global $wgUseSquid, $wgDeferredUpdateList;
2469                 global $wgUseTrackbacks;
2470
2471                 wfDebug( __METHOD__."\n" );
2472
2473                 $dbw = wfGetDB( DB_MASTER );
2474                 $ns = $this->mTitle->getNamespace();
2475                 $t = $this->mTitle->getDBkey();
2476                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2477
2478                 if( $t == '' || $id == 0 ) {
2479                         return false;
2480                 }
2481
2482                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2483                 array_push( $wgDeferredUpdateList, $u );
2484
2485                 // Bitfields to further suppress the content
2486                 if( $suppress ) {
2487                         $bitfield = 0;
2488                         // This should be 15...
2489                         $bitfield |= Revision::DELETED_TEXT;
2490                         $bitfield |= Revision::DELETED_COMMENT;
2491                         $bitfield |= Revision::DELETED_USER;
2492                         $bitfield |= Revision::DELETED_RESTRICTED;
2493                 } else {
2494                         $bitfield = 'rev_deleted';
2495                 }
2496
2497                 $dbw->begin();
2498                 // For now, shunt the revision data into the archive table.
2499                 // Text is *not* removed from the text table; bulk storage
2500                 // is left intact to avoid breaking block-compression or
2501                 // immutable storage schemes.
2502                 //
2503                 // For backwards compatibility, note that some older archive
2504                 // table entries will have ar_text and ar_flags fields still.
2505                 //
2506                 // In the future, we may keep revisions and mark them with
2507                 // the rev_deleted field, which is reserved for this purpose.
2508                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2509                         array(
2510                                 'ar_namespace'  => 'page_namespace',
2511                                 'ar_title'      => 'page_title',
2512                                 'ar_comment'    => 'rev_comment',
2513                                 'ar_user'       => 'rev_user',
2514                                 'ar_user_text'  => 'rev_user_text',
2515                                 'ar_timestamp'  => 'rev_timestamp',
2516                                 'ar_minor_edit' => 'rev_minor_edit',
2517                                 'ar_rev_id'     => 'rev_id',
2518                                 'ar_text_id'    => 'rev_text_id',
2519                                 'ar_text'       => '\'\'', // Be explicit to appease
2520                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2521                                 'ar_len'        => 'rev_len',
2522                                 'ar_page_id'    => 'page_id',
2523                                 'ar_deleted'    => $bitfield
2524                         ), array(
2525                                 'page_id' => $id,
2526                                 'page_id = rev_page'
2527                         ), __METHOD__
2528                 );
2529
2530                 # Delete restrictions for it
2531                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2532
2533                 # Now that it's safely backed up, delete it
2534                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2535                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2536                 if( !$ok ) {
2537                         $dbw->rollback();
2538                         return false;
2539                 }
2540
2541                 # If using cascading deletes, we can skip some explicit deletes
2542                 if( !$dbw->cascadingDeletes() ) {
2543                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2544
2545                         if($wgUseTrackbacks)
2546                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2547
2548                         # Delete outgoing links
2549                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2550                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2551                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2552                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2553                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2554                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2555                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2556                 }
2557
2558                 # If using cleanup triggers, we can skip some manual deletes
2559                 if( !$dbw->cleanupTriggers() ) {
2560                         # Clean up recentchanges entries...
2561                         $dbw->delete( 'recentchanges',
2562                                 array( 'rc_type != '.RC_LOG,
2563                                         'rc_namespace' => $this->mTitle->getNamespace(),
2564                                         'rc_title' => $this->mTitle->getDBKey() ),
2565                                 __METHOD__ );
2566                         $dbw->delete( 'recentchanges',
2567                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2568                                 __METHOD__ );
2569                 }
2570
2571                 # Clear caches
2572                 Article::onArticleDelete( $this->mTitle );
2573
2574                 # Fix category table counts
2575                 $cats = array();
2576                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2577                 foreach( $res as $row ) {
2578                         $cats []= $row->cl_to;
2579                 }
2580                 $this->updateCategoryCounts( array(), $cats );
2581
2582                 # Clear the cached article id so the interface doesn't act like we exist
2583                 $this->mTitle->resetArticleID( 0 );
2584                 $this->mTitle->mArticleID = 0;
2585
2586                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2587                 $logtype = $suppress ? 'suppress' : 'delete';
2588                 $log = new LogPage( $logtype );
2589
2590                 # Make sure logging got through
2591                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2592
2593                 $dbw->commit();
2594
2595                 return true;
2596         }
2597
2598         /**
2599          * Roll back the most recent consecutive set of edits to a page
2600          * from the same user; fails if there are no eligible edits to
2601          * roll back to, e.g. user is the sole contributor. This function
2602          * performs permissions checks on $wgUser, then calls commitRollback()
2603          * to do the dirty work
2604          *
2605          * @param $fromP String: Name of the user whose edits to rollback.
2606          * @param $summary String: Custom summary. Set to default summary if empty.
2607          * @param $token String: Rollback token.
2608          * @param $bot Boolean: If true, mark all reverted edits as bot.
2609          *
2610          * @param $resultDetails Array: contains result-specific array of additional values
2611          *    'alreadyrolled' : 'current' (rev)
2612          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2613          *
2614          * @return array of errors, each error formatted as
2615          *   array(messagekey, param1, param2, ...).
2616          * On success, the array is empty.  This array can also be passed to
2617          * OutputPage::showPermissionsErrorPage().
2618          */
2619         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2620                 global $wgUser;
2621                 $resultDetails = null;
2622
2623                 # Check permissions
2624                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2625                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2626                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2627
2628                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2629                         $errors[] = array( 'sessionfailure' );
2630
2631                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2632                         $errors[] = array( 'actionthrottledtext' );
2633                 }
2634                 # If there were errors, bail out now
2635                 if( !empty( $errors ) )
2636                         return $errors;
2637
2638                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2639         }
2640
2641         /**
2642          * Backend implementation of doRollback(), please refer there for parameter
2643          * and return value documentation
2644          *
2645          * NOTE: This function does NOT check ANY permissions, it just commits the
2646          * rollback to the DB Therefore, you should only call this function direct-
2647          * ly if you want to use custom permissions checks. If you don't, use
2648          * doRollback() instead.
2649          */
2650         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2651                 global $wgUseRCPatrol, $wgUser, $wgLang;
2652                 $dbw = wfGetDB( DB_MASTER );
2653
2654                 if( wfReadOnly() ) {
2655                         return array( array( 'readonlytext' ) );
2656                 }
2657
2658                 # Get the last editor
2659                 $current = Revision::newFromTitle( $this->mTitle );
2660                 if( is_null( $current ) ) {
2661                         # Something wrong... no page?
2662                         return array(array('notanarticle'));
2663                 }
2664
2665                 $from = str_replace( '_', ' ', $fromP );
2666                 if( $from != $current->getUserText() ) {
2667                         $resultDetails = array( 'current' => $current );
2668                         return array(array('alreadyrolled',
2669                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2670                                 htmlspecialchars($fromP),
2671                                 htmlspecialchars($current->getUserText())
2672                         ));
2673                 }
2674
2675                 # Get the last edit not by this guy
2676                 $user = intval( $current->getUser() );
2677                 $user_text = $dbw->addQuotes( $current->getUserText() );
2678                 $s = $dbw->selectRow( 'revision',
2679                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2680                         array(  'rev_page' => $current->getPage(),
2681                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2682                         ), __METHOD__,
2683                         array(  'USE INDEX' => 'page_timestamp',
2684                                 'ORDER BY'  => 'rev_timestamp DESC' )
2685                         );
2686                 if( $s === false ) {
2687                         # No one else ever edited this page
2688                         return array(array('cantrollback'));
2689                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2690                         # Only admins can see this text
2691                         return array(array('notvisiblerev'));
2692                 }
2693
2694                 $set = array();
2695                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2696                         # Mark all reverted edits as bot
2697                         $set['rc_bot'] = 1;
2698                 }
2699                 if( $wgUseRCPatrol ) {
2700                         # Mark all reverted edits as patrolled
2701                         $set['rc_patrolled'] = 1;
2702                 }
2703
2704                 if( $set ) {
2705                         $dbw->update( 'recentchanges', $set,
2706                                         array( /* WHERE */
2707                                                 'rc_cur_id' => $current->getPage(),
2708                                                 'rc_user_text' => $current->getUserText(),
2709                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2710                                         ), __METHOD__
2711                                 );
2712                 }
2713
2714                 # Generate the edit summary if necessary
2715                 $target = Revision::newFromId( $s->rev_id );
2716                 if( empty( $summary ) ){
2717                         $summary = wfMsgForContent( 'revertpage' );
2718                 }
2719
2720                 # Allow the custom summary to use the same args as the default message
2721                 $args = array(
2722                         $target->getUserText(), $from, $s->rev_id,
2723                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2724                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2725                 );
2726                 $summary = wfMsgReplaceArgs( $summary, $args );
2727
2728                 # Save
2729                 $flags = EDIT_UPDATE;
2730
2731                 if( $wgUser->isAllowed('minoredit') )
2732                         $flags |= EDIT_MINOR;
2733
2734                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2735                         $flags |= EDIT_FORCE_BOT;
2736                 # Actually store the edit
2737                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2738                 if( !empty( $status->value['revision'] ) ) {
2739                         $revId = $status->value['revision']->getId();
2740                 } else {
2741                         $revId = false;
2742                 }
2743
2744                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2745
2746                 $resultDetails = array(
2747                         'summary' => $summary,
2748                         'current' => $current,
2749                         'target' => $target,
2750                         'newid' => $revId
2751                 );
2752                 return array();
2753         }
2754
2755         /**
2756          * User interface for rollback operations
2757          */
2758         public function rollback() {
2759                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2760                 $details = null;
2761
2762                 $result = $this->doRollback(
2763                         $wgRequest->getVal( 'from' ),
2764                         $wgRequest->getText( 'summary' ),
2765                         $wgRequest->getVal( 'token' ),
2766                         $wgRequest->getBool( 'bot' ),
2767                         $details
2768                 );
2769
2770                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2771                         $wgOut->rateLimited();
2772                         return;
2773                 }
2774                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2775                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2776                         $errArray = $result[0];
2777                         $errMsg = array_shift( $errArray );
2778                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2779                         if( isset( $details['current'] ) ){
2780                                 $current = $details['current'];
2781                                 if( $current->getComment() != '' ) {
2782                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2783                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2784                                 }
2785                         }
2786                         return;
2787                 }
2788                 # Display permissions errors before read-only message -- there's no
2789                 # point in misleading the user into thinking the inability to rollback
2790                 # is only temporary.
2791                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2792                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2793                         # move any 'readonlytext' error manually.
2794                         $out = array();
2795                         foreach( $result as $error ) {
2796                                 if( $error != array( 'readonlytext' ) ) {
2797                                         $out []= $error;
2798                                 }
2799                         }
2800                         $wgOut->showPermissionsErrorPage( $out );
2801                         return;
2802                 }
2803                 if( $result == array( array( 'readonlytext' ) ) ) {
2804                         $wgOut->readOnlyPage();
2805                         return;
2806                 }
2807
2808                 $current = $details['current'];
2809                 $target = $details['target'];
2810                 $newId = $details['newid'];
2811                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2812                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2813                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2814                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2815                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2816                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2817                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2818                 $wgOut->returnToMain( false, $this->mTitle );
2819
2820                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2821                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2822                         $de->showDiff( '', '' );
2823                 }
2824         }
2825
2826
2827         /**
2828          * Do standard deferred updates after page view
2829          */
2830         public function viewUpdates() {
2831                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2832                 # Don't update page view counters on views from bot users (bug 14044)
2833                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2834                         Article::incViewCount( $this->getID() );
2835                         $u = new SiteStatsUpdate( 1, 0, 0 );
2836                         array_push( $wgDeferredUpdateList, $u );
2837                 }
2838                 # Update newtalk / watchlist notification status
2839                 $wgUser->clearNotification( $this->mTitle );
2840         }
2841
2842         /**
2843          * Prepare text which is about to be saved.
2844          * Returns a stdclass with source, pst and output members
2845          */
2846         public function prepareTextForEdit( $text, $revid=null ) {
2847                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2848                         // Already prepared
2849                         return $this->mPreparedEdit;
2850                 }
2851                 global $wgParser;
2852                 $edit = (object)array();
2853                 $edit->revid = $revid;
2854                 $edit->newText = $text;
2855                 $edit->pst = $this->preSaveTransform( $text );
2856                 $options = new ParserOptions;
2857                 $options->setTidy( true );
2858                 $options->enableLimitReport();
2859                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2860                 $edit->oldText = $this->getContent();
2861                 $this->mPreparedEdit = $edit;
2862                 return $edit;
2863         }
2864
2865         /**
2866          * Do standard deferred updates after page edit.
2867          * Update links tables, site stats, search index and message cache.
2868          * Purges pages that include this page if the text was changed here.
2869          * Every 100th edit, prune the recent changes table.
2870          *
2871          * @private
2872          * @param $text New text of the article
2873          * @param $summary Edit summary
2874          * @param $minoredit Minor edit
2875          * @param $timestamp_of_pagechange Timestamp associated with the page change
2876          * @param $newid rev_id value of the new revision
2877          * @param $changed Whether or not the content actually changed
2878          */
2879         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2880                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2881
2882                 wfProfileIn( __METHOD__ );
2883
2884                 # Parse the text
2885                 # Be careful not to double-PST: $text is usually already PST-ed once
2886                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2887                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2888                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2889                 } else {
2890                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2891                         $editInfo = $this->mPreparedEdit;
2892                 }
2893
2894                 # Save it to the parser cache
2895                 if( $wgEnableParserCache ) {
2896                         $parserCache = ParserCache::singleton();
2897                         $parserCache->save( $editInfo->output, $this, $wgUser );
2898                 }
2899
2900                 # Update the links tables
2901                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2902                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2903                 $u->doUpdate();
2904
2905                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2906
2907                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2908                         if( 0 == mt_rand( 0, 99 ) ) {
2909                                 // Flush old entries from the `recentchanges` table; we do this on
2910                                 // random requests so as to avoid an increase in writes for no good reason
2911                                 global $wgRCMaxAge;
2912                                 $dbw = wfGetDB( DB_MASTER );
2913                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2914                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2915                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2916                                 $dbw->query( $sql );
2917                         }
2918                 }
2919
2920                 $id = $this->getID();
2921                 $title = $this->mTitle->getPrefixedDBkey();
2922                 $shortTitle = $this->mTitle->getDBkey();
2923
2924                 if( 0 == $id ) {
2925                         wfProfileOut( __METHOD__ );
2926                         return;
2927                 }
2928
2929                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2930                 array_push( $wgDeferredUpdateList, $u );
2931                 $u = new SearchUpdate( $id, $title, $text );
2932                 array_push( $wgDeferredUpdateList, $u );
2933
2934                 # If this is another user's talk page, update newtalk
2935                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2936                 # load of user talk pages and piss people off, nor if it's a minor edit
2937                 # by a properly-flagged bot.
2938                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2939                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2940                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2941                                 $other = User::newFromName( $shortTitle, false );
2942                                 if( !$other ) {
2943                                         wfDebug( __METHOD__.": invalid username\n" );
2944                                 } elseif( User::isIP( $shortTitle ) ) {
2945                                         // An anonymous user
2946                                         $other->setNewtalk( true );
2947                                 } elseif( $other->isLoggedIn() ) {
2948                                         $other->setNewtalk( true );
2949                                 } else {
2950                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2951                                 }
2952                         }
2953                 }
2954
2955                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2956                         $wgMessageCache->replace( $shortTitle, $text );
2957                 }
2958
2959                 wfProfileOut( __METHOD__ );
2960         }
2961
2962         /**
2963          * Perform article updates on a special page creation.
2964          *
2965          * @param $rev Revision object
2966          *
2967          * @todo This is a shitty interface function. Kill it and replace the
2968          * other shitty functions like editUpdates and such so it's not needed
2969          * anymore.
2970          */
2971         public function createUpdates( $rev ) {
2972                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2973                 $this->mTotalAdjustment = 1;
2974                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2975                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2976         }
2977
2978         /**
2979          * Generate the navigation links when browsing through an article revisions
2980          * It shows the information as:
2981          *   Revision as of \<date\>; view current revision
2982          *   \<- Previous version | Next Version -\>
2983          *
2984          * @param $oldid String: revision ID of this article revision
2985          */
2986         public function setOldSubtitle( $oldid = 0 ) {
2987                 global $wgLang, $wgOut, $wgUser;
2988
2989                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
2990                         return;
2991                 }
2992
2993                 $revision = Revision::newFromId( $oldid );
2994
2995                 $current = ( $oldid == $this->mLatest );
2996                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2997                 $sk = $wgUser->getSkin();
2998                 $lnk = $current
2999                         ? wfMsgHtml( 'currentrevisionlink' )
3000                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3001                 $curdiff = $current
3002                         ? wfMsgHtml( 'diff' )
3003                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3004                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3005                 $prevlink = $prev
3006                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3007                         : wfMsgHtml( 'previousrevision' );
3008                 $prevdiff = $prev
3009                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3010                         : wfMsgHtml( 'diff' );
3011                 $nextlink = $current
3012                         ? wfMsgHtml( 'nextrevision' )
3013                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3014                 $nextdiff = $current
3015                         ? wfMsgHtml( 'diff' )
3016                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3017
3018                 $cdel='';
3019                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3020                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3021                         if( $revision->isCurrent() ) {
3022                         // We don't handle top deleted edits too well
3023                                 $cdel = wfMsgHtml( 'rev-delundel' );
3024                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3025                         // If revision was hidden from sysops
3026                                 $cdel = wfMsgHtml( 'rev-delundel' );
3027                         } else {
3028                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3029                                         wfMsgHtml('rev-delundel'),
3030                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3031                                         '&oldid=' . urlencode( $oldid ) );
3032                                 // Bolden oversighted content
3033                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3034                                         $cdel = "<strong>$cdel</strong>";
3035                         }
3036                         $cdel = "(<small>$cdel</small>) ";
3037                 }
3038                 # Show user links if allowed to see them. Normally they
3039                 # are hidden regardless, but since we can already see the text here...
3040                 $userlinks = $sk->revUserTools( $revision, false );
3041
3042                 $m = wfMsg( 'revision-info-current' );
3043                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3044                         ? 'revision-info-current'
3045                         : 'revision-info';
3046
3047                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ), $td, $userlinks, $revision->getID() ) . "</div>\n" .
3048
3049                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgHtml( 'revision-nav', $prevdiff,
3050                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3051                 $wgOut->setSubtitle( $r );
3052         }
3053
3054         /**
3055          * This function is called right before saving the wikitext,
3056          * so we can do things like signatures and links-in-context.
3057          *
3058          * @param $text String
3059          */
3060         public function preSaveTransform( $text ) {
3061                 global $wgParser, $wgUser;
3062                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3063         }
3064
3065         /* Caching functions */
3066
3067         /**
3068          * checkLastModified returns true if it has taken care of all
3069          * output to the client that is necessary for this request.
3070          * (that is, it has sent a cached version of the page)
3071          */
3072         protected function tryFileCache() {
3073                 static $called = false;
3074                 if( $called ) {
3075                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3076                         return false;
3077                 }
3078                 $called = true;
3079                 if( $this->isFileCacheable() ) {
3080                         $cache = new HTMLFileCache( $this->mTitle );
3081                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3082                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3083                                 $cache->loadFromFileCache();
3084                                 return true;
3085                         } else {
3086                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3087                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3088                         }
3089                 } else {
3090                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3091                 }
3092                 return false;
3093         }
3094
3095         /**
3096          * Check if the page can be cached
3097          * @return bool
3098          */
3099         public function isFileCacheable() {
3100                 $cacheable = false;
3101                 if( HTMLFileCache::useFileCache() ) {
3102                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3103                         // Extension may have reason to disable file caching on some pages.
3104                         if( $cacheable ) {
3105                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3106                         }
3107                 }
3108                 return $cacheable;
3109         }
3110
3111         /**
3112          * Loads page_touched and returns a value indicating if it should be used
3113          *
3114          */
3115         public function checkTouched() {
3116                 if( !$this->mDataLoaded ) {
3117                         $this->loadPageData();
3118                 }
3119                 return !$this->mIsRedirect;
3120         }
3121
3122         /**
3123          * Get the page_touched field
3124          */
3125         public function getTouched() {
3126                 # Ensure that page data has been loaded
3127                 if( !$this->mDataLoaded ) {
3128                         $this->loadPageData();
3129                 }
3130                 return $this->mTouched;
3131         }
3132
3133         /**
3134          * Get the page_latest field
3135          */
3136         public function getLatest() {
3137                 if( !$this->mDataLoaded ) {
3138                         $this->loadPageData();
3139                 }
3140                 return $this->mLatest;
3141         }
3142
3143         /**
3144          * Edit an article without doing all that other stuff
3145          * The article must already exist; link tables etc
3146          * are not updated, caches are not flushed.
3147          *
3148          * @param $text String: text submitted
3149          * @param $comment String: comment submitted
3150          * @param $minor Boolean: whereas it's a minor modification
3151          */
3152         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3153                 wfProfileIn( __METHOD__ );
3154
3155                 $dbw = wfGetDB( DB_MASTER );
3156                 $revision = new Revision( array(
3157                         'page'       => $this->getId(),
3158                         'text'       => $text,
3159                         'comment'    => $comment,
3160                         'minor_edit' => $minor ? 1 : 0,
3161                         ) );
3162                 $revision->insertOn( $dbw );
3163                 $this->updateRevisionOn( $dbw, $revision );
3164
3165                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3166
3167                 wfProfileOut( __METHOD__ );
3168         }
3169
3170         /**
3171          * Used to increment the view counter
3172          *
3173          * @param $id Integer: article id
3174          */
3175         public static function incViewCount( $id ) {
3176                 $id = intval( $id );
3177                 global $wgHitcounterUpdateFreq, $wgDBtype;
3178
3179                 $dbw = wfGetDB( DB_MASTER );
3180                 $pageTable = $dbw->tableName( 'page' );
3181                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3182                 $acchitsTable = $dbw->tableName( 'acchits' );
3183
3184                 if( $wgHitcounterUpdateFreq <= 1 ) {
3185                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3186                         return;
3187                 }
3188
3189                 # Not important enough to warrant an error page in case of failure
3190                 $oldignore = $dbw->ignoreErrors( true );
3191
3192                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3193
3194                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3195                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3196                         # Most of the time (or on SQL errors), skip row count check
3197                         $dbw->ignoreErrors( $oldignore );
3198                         return;
3199                 }
3200
3201                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3202                 $row = $dbw->fetchObject( $res );
3203                 $rown = intval( $row->n );
3204                 if( $rown >= $wgHitcounterUpdateFreq ){
3205                         wfProfileIn( 'Article::incViewCount-collect' );
3206                         $old_user_abort = ignore_user_abort( true );
3207
3208                         if($wgDBtype == 'mysql')
3209                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3210                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3211                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3212                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3213                                 'GROUP BY hc_id');
3214                         $dbw->query("DELETE FROM $hitcounterTable");
3215                         if($wgDBtype == 'mysql') {
3216                                 $dbw->query('UNLOCK TABLES');
3217                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3218                                         'WHERE page_id = hc_id');
3219                         }
3220                         else {
3221                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3222                                         "FROM $acchitsTable WHERE page_id = hc_id");
3223                         }
3224                         $dbw->query("DROP TABLE $acchitsTable");
3225
3226                         ignore_user_abort( $old_user_abort );
3227                         wfProfileOut( 'Article::incViewCount-collect' );
3228                 }
3229                 $dbw->ignoreErrors( $oldignore );
3230         }
3231
3232         /**#@+
3233          * The onArticle*() functions are supposed to be a kind of hooks
3234          * which should be called whenever any of the specified actions
3235          * are done.
3236          *
3237          * This is a good place to put code to clear caches, for instance.
3238          *
3239          * This is called on page move and undelete, as well as edit
3240          *
3241          * @param $title a title object
3242          */
3243
3244         public static function onArticleCreate( $title ) {
3245                 # Update existence markers on article/talk tabs...
3246                 if( $title->isTalkPage() ) {
3247                         $other = $title->getSubjectPage();
3248                 } else {
3249                         $other = $title->getTalkPage();
3250                 }
3251                 $other->invalidateCache();
3252                 $other->purgeSquid();
3253
3254                 $title->touchLinks();
3255                 $title->purgeSquid();
3256                 $title->deleteTitleProtection();
3257         }
3258
3259         public static function onArticleDelete( $title ) {
3260                 global $wgMessageCache;
3261                 # Update existence markers on article/talk tabs...
3262                 if( $title->isTalkPage() ) {
3263                         $other = $title->getSubjectPage();
3264                 } else {
3265                         $other = $title->getTalkPage();
3266                 }
3267                 $other->invalidateCache();
3268                 $other->purgeSquid();
3269
3270                 $title->touchLinks();
3271                 $title->purgeSquid();
3272
3273                 # File cache
3274                 HTMLFileCache::clearFileCache( $title );
3275
3276                 # Messages
3277                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3278                         $wgMessageCache->replace( $title->getDBkey(), false );
3279                 }
3280                 # Images
3281                 if( $title->getNamespace() == NS_FILE ) {
3282                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3283                         $update->doUpdate();
3284                 }
3285                 # User talk pages
3286                 if( $title->getNamespace() == NS_USER_TALK ) {
3287                         $user = User::newFromName( $title->getText(), false );
3288                         $user->setNewtalk( false );
3289                 }
3290         }
3291
3292         /**
3293          * Purge caches on page update etc
3294          */
3295         public static function onArticleEdit( $title, $transclusions = 'transclusions' ) {
3296                 global $wgDeferredUpdateList;
3297
3298                 // Invalidate caches of articles which include this page
3299                 if( $transclusions !== 'skiptransclusions' )
3300                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3301
3302                 // Invalidate the caches of all pages which redirect here
3303                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3304
3305                 # Purge squid for this page only
3306                 $title->purgeSquid();
3307
3308                 # Clear file cache for this page only
3309                 HTMLFileCache::clearFileCache( $title );
3310         }
3311
3312         /**#@-*/
3313
3314         /**
3315          * Overriden by ImagePage class, only present here to avoid a fatal error
3316          * Called for ?action=revert
3317          */
3318         public function revert() {
3319                 global $wgOut;
3320                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3321         }
3322
3323         /**
3324          * Info about this page
3325          * Called for ?action=info when $wgAllowPageInfo is on.
3326          */
3327         public function info() {
3328                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3329
3330                 if( !$wgAllowPageInfo ) {
3331                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3332                         return;
3333                 }
3334
3335                 $page = $this->mTitle->getSubjectPage();
3336
3337                 $wgOut->setPagetitle( $page->getPrefixedText() );
3338                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3339                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3340
3341                 if( !$this->mTitle->exists() ) {
3342                         $wgOut->addHTML( '<div class="noarticletext">' );
3343                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3344                                 // This doesn't quite make sense; the user is asking for
3345                                 // information about the _page_, not the message... -- RC
3346                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3347                         } else {
3348                                 $msg = $wgUser->isLoggedIn()
3349                                         ? 'noarticletext'
3350                                         : 'noarticletextanon';
3351                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3352                         }
3353                         $wgOut->addHTML( '</div>' );
3354                 } else {
3355                         $dbr = wfGetDB( DB_SLAVE );
3356                         $wl_clause = array(
3357                                 'wl_title'     => $page->getDBkey(),
3358                                 'wl_namespace' => $page->getNamespace() );
3359                         $numwatchers = $dbr->selectField(
3360                                 'watchlist',
3361                                 'COUNT(*)',
3362                                 $wl_clause,
3363                                 __METHOD__,
3364                                 $this->getSelectOptions() );
3365
3366                         $pageInfo = $this->pageCountInfo( $page );
3367                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3368
3369                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3370                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3371                         if( $talkInfo ) {
3372                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3373                         }
3374                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3375                         if( $talkInfo ) {
3376                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3377                         }
3378                         $wgOut->addHTML( '</ul>' );
3379                 }
3380         }
3381
3382         /**
3383          * Return the total number of edits and number of unique editors
3384          * on a given page. If page does not exist, returns false.
3385          *
3386          * @param $title Title object
3387          * @return array
3388          */
3389         protected function pageCountInfo( $title ) {
3390                 $id = $title->getArticleId();
3391                 if( $id == 0 ) {
3392                         return false;
3393                 }
3394                 $dbr = wfGetDB( DB_SLAVE );
3395                 $rev_clause = array( 'rev_page' => $id );
3396                 $edits = $dbr->selectField(
3397                         'revision',
3398                         'COUNT(rev_page)',
3399                         $rev_clause,
3400                         __METHOD__,
3401                         $this->getSelectOptions()
3402                 );
3403                 $authors = $dbr->selectField(
3404                         'revision',
3405                         'COUNT(DISTINCT rev_user_text)',
3406                         $rev_clause,
3407                         __METHOD__,
3408                         $this->getSelectOptions()
3409                 );
3410                 return array( 'edits' => $edits, 'authors' => $authors );
3411         }
3412
3413         /**
3414          * Return a list of templates used by this article.
3415          * Uses the templatelinks table
3416          *
3417          * @return Array of Title objects
3418          */
3419         public function getUsedTemplates() {
3420                 $result = array();
3421                 $id = $this->mTitle->getArticleID();
3422                 if( $id == 0 ) {
3423                         return array();
3424                 }
3425                 $dbr = wfGetDB( DB_SLAVE );
3426                 $res = $dbr->select( array( 'templatelinks' ),
3427                         array( 'tl_namespace', 'tl_title' ),
3428                         array( 'tl_from' => $id ),
3429                         __METHOD__ );
3430                 if( $res !== false ) {
3431                         foreach( $res as $row ) {
3432                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3433                         }
3434                 }
3435                 $dbr->freeResult( $res );
3436                 return $result;
3437         }
3438
3439         /**
3440          * Returns a list of hidden categories this page is a member of.
3441          * Uses the page_props and categorylinks tables.
3442          *
3443          * @return Array of Title objects
3444          */
3445         public function getHiddenCategories() {
3446                 $result = array();
3447                 $id = $this->mTitle->getArticleID();
3448                 if( $id == 0 ) {
3449                         return array();
3450                 }
3451                 $dbr = wfGetDB( DB_SLAVE );
3452                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3453                         array( 'cl_to' ),
3454                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3455                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3456                         __METHOD__ );
3457                 if( $res !== false ) {
3458                         foreach( $res as $row ) {
3459                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3460                         }
3461                 }
3462                 $dbr->freeResult( $res );
3463                 return $result;
3464         }
3465
3466         /**
3467         * Return an applicable autosummary if one exists for the given edit.
3468         * @param $oldtext String: the previous text of the page.
3469         * @param $newtext String: The submitted text of the page.
3470         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3471         * @return string An appropriate autosummary, or an empty string.
3472         */
3473         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3474                 # Decide what kind of autosummary is needed.
3475
3476                 # Redirect autosummaries
3477                 $ot = Title::newFromRedirect( $oldtext );
3478                 $rt = Title::newFromRedirect( $newtext );
3479                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3480                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3481                 }
3482
3483                 # New page autosummaries
3484                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3485                         # If they're making a new article, give its text, truncated, in the summary.
3486                         global $wgContLang;
3487                         $truncatedtext = $wgContLang->truncate(
3488                                 str_replace("\n", ' ', $newtext),
3489                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ),
3490                                 '...' );
3491                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3492                 }
3493
3494                 # Blanking autosummaries
3495                 if( $oldtext != '' && $newtext == '' ) {
3496                         return wfMsgForContent( 'autosumm-blank' );
3497                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3498                         # Removing more than 90% of the article
3499                         global $wgContLang;
3500                         $truncatedtext = $wgContLang->truncate(
3501                                 $newtext,
3502                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3503                                 '...'
3504                         );
3505                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3506                 }
3507
3508                 # If we reach this point, there's no applicable autosummary for our case, so our
3509                 # autosummary is empty.
3510                 return '';
3511         }
3512
3513         /**
3514          * Add the primary page-view wikitext to the output buffer
3515          * Saves the text into the parser cache if possible.
3516          * Updates templatelinks if it is out of date.
3517          *
3518          * @param $text String
3519          * @param $cache Boolean
3520          */
3521         public function outputWikiText( $text, $cache = true ) {
3522                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3523
3524                 $popts = $wgOut->parserOptions();
3525                 $popts->setTidy(true);
3526                 $popts->enableLimitReport();
3527                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3528                         $popts, true, true, $this->getRevIdFetched() );
3529                 $popts->setTidy(false);
3530                 $popts->enableLimitReport( false );
3531                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3532                         $parserCache = ParserCache::singleton();
3533                         $parserCache->save( $parserOutput, $this, $wgUser );
3534                 }
3535                 // Make sure file cache is not used on uncacheable content.
3536                 // Output that has magic words in it can still use the parser cache
3537                 // (if enabled), though it will generally expire sooner.
3538                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3539                         $wgUseFileCache = false;
3540                 }
3541
3542                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3543                         // templatelinks table may have become out of sync,
3544                         // especially if using variable-based transclusions.
3545                         // For paranoia, check if things have changed and if
3546                         // so apply updates to the database. This will ensure
3547                         // that cascaded protections apply as soon as the changes
3548                         // are visible.
3549
3550                         # Get templates from templatelinks
3551                         $id = $this->mTitle->getArticleID();
3552
3553                         $tlTemplates = array();
3554
3555                         $dbr = wfGetDB( DB_SLAVE );
3556                         $res = $dbr->select( array( 'templatelinks' ),
3557                                 array( 'tl_namespace', 'tl_title' ),
3558                                 array( 'tl_from' => $id ),
3559                                 __METHOD__ );
3560
3561                         global $wgContLang;
3562
3563                         if( $res !== false ) {
3564                                 foreach( $res as $row ) {
3565                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3566                                 }
3567                         }
3568
3569                         # Get templates from parser output.
3570                         $poTemplates_allns = $parserOutput->getTemplates();
3571
3572                         $poTemplates = array ();
3573                         foreach ( $poTemplates_allns as $ns_templates ) {
3574                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3575                         }
3576
3577                         # Get the diff
3578                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3579
3580                         if( count( $templates_diff ) > 0 ) {
3581                                 # Whee, link updates time.
3582                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3583                                 $u->doUpdate();
3584                         }
3585                 }
3586
3587                 $wgOut->addParserOutput( $parserOutput );
3588         }
3589
3590         /**
3591          * Update all the appropriate counts in the category table, given that
3592          * we've added the categories $added and deleted the categories $deleted.
3593          *
3594          * @param $added array   The names of categories that were added
3595          * @param $deleted array The names of categories that were deleted
3596          * @return null
3597          */
3598         public function updateCategoryCounts( $added, $deleted ) {
3599                 $ns = $this->mTitle->getNamespace();
3600                 $dbw = wfGetDB( DB_MASTER );
3601
3602                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3603                 # exist, we might legitimately not create it, but it's simpler to just
3604                 # create it and then give it a negative value, since the value is bogus
3605                 # anyway.
3606                 #
3607                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3608                 $insertCats = array_merge( $added, $deleted );
3609                 if( !$insertCats ) {
3610                         # Okay, nothing to do
3611                         return;
3612                 }
3613                 $insertRows = array();
3614                 foreach( $insertCats as $cat ) {
3615                         $insertRows[] = array( 'cat_title' => $cat );
3616                 }
3617                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3618
3619                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3620                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3621                 if( $ns == NS_CATEGORY ) {
3622                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3623                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3624                 } elseif( $ns == NS_FILE ) {
3625                         $addFields[]    = 'cat_files = cat_files + 1';
3626                         $removeFields[] = 'cat_files = cat_files - 1';
3627                 }
3628
3629                 if( $added ) {
3630                         $dbw->update(
3631                                 'category',
3632                                 $addFields,
3633                                 array( 'cat_title' => $added ),
3634                                 __METHOD__
3635                         );
3636                 }
3637                 if( $deleted ) {
3638                         $dbw->update(
3639                                 'category',
3640                                 $removeFields,
3641                                 array( 'cat_title' => $deleted ),
3642                                 __METHOD__
3643                         );
3644                 }
3645         }
3646 }