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         var $mParserOptions;              // !<
  44         var $mParserOutput;               // !<
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an article article
  59          * @param $id The article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 # FIXME: doesn't inherit right
  64                 return $t == null ? null : new self( $t );
  65                 # return $t == null ? null : new static( $t ); // PHP 5.3
  66         }
  67
  68         /**
  69          * Tell the page view functions that this view was redirected
  70          * from another page on the wiki.
  71          * @param $from Title object.
  72          */
  73         public function setRedirectedFrom( $from ) {
  74                 $this->mRedirectedFrom = $from;
  75         }
  76
  77         /**
  78          * If this page is a redirect, get its target
  79          *
  80          * The target will be fetched from the redirect table if possible.
  81          * If this page doesn't have an entry there, call insertRedirect()
  82          * @return mixed Title object, or null if this page is not a redirect
  83          */
  84         public function getRedirectTarget() {
  85                 if ( !$this->mTitle || !$this->mTitle->isRedirect() )
  86                         return null;
  87                 if ( !is_null( $this->mRedirectTarget ) )
  88                         return $this->mRedirectTarget;
  89                 # Query the redirect table
  90                 $dbr = wfGetDB( DB_SLAVE );
  91                 $row = $dbr->selectRow( 'redirect',
  92                         array( 'rd_namespace', 'rd_title' ),
  93                         array( 'rd_from' => $this->getID() ),
  94                         __METHOD__
  95                 );
  96                 if ( $row ) {
  97                         return $this->mRedirectTarget = Title::makeTitle( $row->rd_namespace, $row->rd_title );
  98                 }
  99                 # This page doesn't have an entry in the redirect table
 100                 return $this->mRedirectTarget = $this->insertRedirect();
 101         }
 102
 103         /**
 104          * Insert an entry for this page into the redirect table.
 105          *
 106          * Don't call this function directly unless you know what you're doing.
 107          * @return Title object
 108          */
 109         public function insertRedirect() {
 110                 $retval = Title::newFromRedirect( $this->getContent() );
 111                 if ( !$retval ) {
 112                         return null;
 113                 }
 114                 $dbw = wfGetDB( DB_MASTER );
 115                 $dbw->replace( 'redirect', array( 'rd_from' ),
 116                         array(
 117                                 'rd_from' => $this->getID(),
 118                                 'rd_namespace' => $retval->getNamespace(),
 119                                 'rd_title' => $retval->getDBkey()
 120                         ),
 121                         __METHOD__
 122                 );
 123                 return $retval;
 124         }
 125
 126         /**
 127          * Get the Title object this page redirects to
 128          *
 129          * @return mixed false, Title of in-wiki target, or string with URL
 130          */
 131         public function followRedirect() {
 132                 $text = $this->getContent();
 133                 return $this->followRedirectText( $text );
 134         }
 135
 136         /**
 137          * Get the Title object this text redirects to
 138          *
 139          * @return mixed false, Title of in-wiki target, or string with URL
 140          */
 141         public function followRedirectText( $text ) {
 142                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 143                 # process if title object is valid and not special:userlogout
 144                 if ( $rt ) {
 145                         if ( $rt->getInterwiki() != '' ) {
 146                                 if ( $rt->isLocal() ) {
 147                                         // Offsite wikis need an HTTP redirect.
 148                                         //
 149                                         // This can be hard to reverse and may produce loops,
 150                                         // so they may be disabled in the site configuration.
 151                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 152                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 153                                 }
 154                         } else {
 155                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 156                                         // Gotta handle redirects to special pages differently:
 157                                         // Fill the HTTP response "Location" header and ignore
 158                                         // the rest of the page we're on.
 159                                         //
 160                                         // This can be hard to reverse, so they may be disabled.
 161                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 162                                                 // rolleyes
 163                                         } else {
 164                                                 return $rt->getFullURL();
 165                                         }
 166                                 }
 167                                 return $rt;
 168                         }
 169                 }
 170                 // No or invalid redirect
 171                 return false;
 172         }
 173
 174         /**
 175          * get the title object of the article
 176          */
 177         public function getTitle() {
 178                 return $this->mTitle;
 179         }
 180
 181         /**
 182          * Clear the object
 183          * @private
 184          */
 185         public function clear() {
 186                 $this->mDataLoaded    = false;
 187                 $this->mContentLoaded = false;
 188
 189                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 190                 $this->mRedirectedFrom = null; # Title object if set
 191                 $this->mRedirectTarget = null; # Title object if set
 192                 $this->mUserText =
 193                 $this->mTimestamp = $this->mComment = '';
 194                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 195                 $this->mTouched = '19700101000000';
 196                 $this->mForUpdate = false;
 197                 $this->mIsRedirect = false;
 198                 $this->mRevIdFetched = 0;
 199                 $this->mRedirectUrl = false;
 200                 $this->mLatest = false;
 201                 $this->mPreparedEdit = false;
 202         }
 203
 204         /**
 205          * Note that getContent/loadContent do not follow redirects anymore.
 206          * If you need to fetch redirectable content easily, try
 207          * the shortcut in Article::followContent()
 208          *
 209          * @return Return the text of this revision
 210          */
 211         public function getContent() {
 212                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 213                 wfProfileIn( __METHOD__ );
 214                 if ( $this->getID() === 0 ) {
 215                         # If this is a MediaWiki:x message, then load the messages
 216                         # and return the message value for x.
 217                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 218                                 # If this is a system message, get the default text.
 219                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 220                                 $wgMessageCache->loadAllMessages( $lang );
 221                                 $text = wfMsgGetKey( $message, false, $lang, false );
 222                                 if ( wfEmptyMsg( $message, $text ) )
 223                                         $text = '';
 224                         } else {
 225                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 226                         }
 227                         wfProfileOut( __METHOD__ );
 228                         return $text;
 229                 } else {
 230                         $this->loadContent();
 231                         wfProfileOut( __METHOD__ );
 232                         return $this->mContent;
 233                 }
 234         }
 235
 236         /**
 237          * Get the text of the current revision. No side-effects...
 238          *
 239          * @return Return the text of the current revision
 240          */
 241         public function getRawText() {
 242                 // Check process cache for current revision
 243                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 244                         return $this->mContent;
 245                 }
 246                 $rev = Revision::newFromTitle( $this->mTitle );
 247                 $text = $rev ? $rev->getRawText() : false;
 248                 return $text;
 249         }
 250
 251         /**
 252          * This function returns the text of a section, specified by a number ($section).
 253          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 254          * the first section before any such heading (section 0).
 255          *
 256          * If a section contains subsections, these are also returned.
 257          *
 258          * @param $text String: text to look in
 259          * @param $section Integer: section number
 260          * @return string text of the requested section
 261          * @deprecated
 262          */
 263         public function getSection( $text, $section ) {
 264                 global $wgParser;
 265                 return $wgParser->getSection( $text, $section );
 266         }
 267
 268         /**
 269          * Get the text that needs to be saved in order to undo all revisions
 270          * between $undo and $undoafter. Revisions must belong to the same page,
 271          * must exist and must not be deleted
 272          * @param $undo Revision
 273          * @param $undoafter Revision Must be an earlier revision than $undo
 274          * @return mixed string on success, false on failure
 275          */
 276         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 277                 $undo_text = $undo->getText();
 278                 $undoafter_text = $undoafter->getText();
 279                 $cur_text = $this->getContent();
 280                 if ( $cur_text == $undo_text ) {
 281                         # No use doing a merge if it's just a straight revert.
 282                         return $undoafter_text;
 283                 }
 284                 $undone_text = '';
 285                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 286                         return false;
 287                 return $undone_text;
 288         }
 289
 290         /**
 291          * @return int The oldid of the article that is to be shown, 0 for the
 292          *             current revision
 293          */
 294         public function getOldID() {
 295                 if ( is_null( $this->mOldId ) ) {
 296                         $this->mOldId = $this->getOldIDFromRequest();
 297                 }
 298                 return $this->mOldId;
 299         }
 300
 301         /**
 302          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 303          *
 304          * @return int The old id for the request
 305          */
 306         public function getOldIDFromRequest() {
 307                 global $wgRequest;
 308                 $this->mRedirectUrl = false;
 309                 $oldid = $wgRequest->getVal( 'oldid' );
 310                 if ( isset( $oldid ) ) {
 311                         $oldid = intval( $oldid );
 312                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 313                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 314                                 if ( $nextid  ) {
 315                                         $oldid = $nextid;
 316                                 } else {
 317                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 318                                 }
 319                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 320                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 321                                 if ( $previd ) {
 322                                         $oldid = $previd;
 323                                 }
 324                         }
 325                 }
 326                 if ( !$oldid ) {
 327                         $oldid = 0;
 328                 }
 329                 return $oldid;
 330         }
 331
 332         /**
 333          * Load the revision (including text) into this object
 334          */
 335         function loadContent() {
 336                 if ( $this->mContentLoaded ) return;
 337                 wfProfileIn( __METHOD__ );
 338                 # Query variables :P
 339                 $oldid = $this->getOldID();
 340                 # Pre-fill content with error message so that if something
 341                 # fails we'll have something telling us what we intended.
 342                 $this->mOldId = $oldid;
 343                 $this->fetchContent( $oldid );
 344                 wfProfileOut( __METHOD__ );
 345         }
 346
 347
 348         /**
 349          * Fetch a page record with the given conditions
 350          * @param $dbr Database object
 351          * @param $conditions Array
 352          */
 353         protected function pageData( $dbr, $conditions ) {
 354                 $fields = array(
 355                                 'page_id',
 356                                 'page_namespace',
 357                                 'page_title',
 358                                 'page_restrictions',
 359                                 'page_counter',
 360                                 'page_is_redirect',
 361                                 'page_is_new',
 362                                 'page_random',
 363                                 'page_touched',
 364                                 'page_latest',
 365                                 'page_len',
 366                 );
 367                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 368                 $row = $dbr->selectRow(
 369                         'page',
 370                         $fields,
 371                         $conditions,
 372                         __METHOD__
 373                 );
 374                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 375                 return $row ;
 376         }
 377
 378         /**
 379          * @param $dbr Database object
 380          * @param $title Title object
 381          */
 382         public function pageDataFromTitle( $dbr, $title ) {
 383                 return $this->pageData( $dbr, array(
 384                         'page_namespace' => $title->getNamespace(),
 385                         'page_title'     => $title->getDBkey() ) );
 386         }
 387
 388         /**
 389          * @param $dbr Database
 390          * @param $id Integer
 391          */
 392         protected function pageDataFromId( $dbr, $id ) {
 393                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 394         }
 395
 396         /**
 397          * Set the general counter, title etc data loaded from
 398          * some source.
 399          *
 400          * @param $data Database row object or "fromdb"
 401          */
 402         public function loadPageData( $data = 'fromdb' ) {
 403                 if ( $data === 'fromdb' ) {
 404                         $dbr = wfGetDB( DB_MASTER );
 405                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 406                 }
 407
 408                 $lc = LinkCache::singleton();
 409                 if ( $data ) {
 410                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 411
 412                         $this->mTitle->mArticleID = intval( $data->page_id );
 413
 414                         # Old-fashioned restrictions
 415                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 416
 417                         $this->mCounter     = intval( $data->page_counter );
 418                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 419                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 420                         $this->mLatest      = intval( $data->page_latest );
 421                 } else {
 422                         if ( is_object( $this->mTitle ) ) {
 423                                 $lc->addBadLinkObj( $this->mTitle );
 424                         }
 425                         $this->mTitle->mArticleID = 0;
 426                 }
 427
 428                 $this->mDataLoaded  = true;
 429         }
 430
 431         /**
 432          * Get text of an article from database
 433          * Does *NOT* follow redirects.
 434          * @param $oldid Int: 0 for whatever the latest revision is
 435          * @return string
 436          */
 437         function fetchContent( $oldid = 0 ) {
 438                 if ( $this->mContentLoaded ) {
 439                         return $this->mContent;
 440                 }
 441
 442                 $dbr = wfGetDB( DB_MASTER );
 443
 444                 # Pre-fill content with error message so that if something
 445                 # fails we'll have something telling us what we intended.
 446                 $t = $this->mTitle->getPrefixedText();
 447                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 448                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 449
 450                 if ( $oldid ) {
 451                         $revision = Revision::newFromId( $oldid );
 452                         if ( is_null( $revision ) ) {
 453                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 454                                 return false;
 455                         }
 456                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 457                         if ( !$data ) {
 458                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 459                                 return false;
 460                         }
 461                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 462                         $this->loadPageData( $data );
 463                 } else {
 464                         if ( !$this->mDataLoaded ) {
 465                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 466                                 if ( !$data ) {
 467                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 468                                         return false;
 469                                 }
 470                                 $this->loadPageData( $data );
 471                         }
 472                         $revision = Revision::newFromId( $this->mLatest );
 473                         if ( is_null( $revision ) ) {
 474                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 475                                 return false;
 476                         }
 477                 }
 478
 479                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 480                 // We should instead work with the Revision object when we need it...
 481                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 482
 483                 $this->mUser      = $revision->getUser();
 484                 $this->mUserText  = $revision->getUserText();
 485                 $this->mComment   = $revision->getComment();
 486                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 487
 488                 $this->mRevIdFetched = $revision->getId();
 489                 $this->mContentLoaded = true;
 490                 $this->mRevision =& $revision;
 491
 492                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 493
 494                 return $this->mContent;
 495         }
 496
 497         /**
 498          * Read/write accessor to select FOR UPDATE
 499          *
 500          * @param $x Mixed: FIXME
 501          */
 502         public function forUpdate( $x = null ) {
 503                 return wfSetVar( $this->mForUpdate, $x );
 504         }
 505
 506         /**
 507          * Get the database which should be used for reads
 508          *
 509          * @return Database
 510          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 511          */
 512         function getDB() {
 513                 wfDeprecated( __METHOD__ );
 514                 return wfGetDB( DB_MASTER );
 515         }
 516
 517         /**
 518          * Get options for all SELECT statements
 519          *
 520          * @param $options Array: an optional options array which'll be appended to
 521          *                       the default
 522          * @return Array: options
 523          */
 524         protected function getSelectOptions( $options = '' ) {
 525                 if ( $this->mForUpdate ) {
 526                         if ( is_array( $options ) ) {
 527                                 $options[] = 'FOR UPDATE';
 528                         } else {
 529                                 $options = 'FOR UPDATE';
 530                         }
 531                 }
 532                 return $options;
 533         }
 534
 535         /**
 536          * @return int Page ID
 537          */
 538         public function getID() {
 539                 if ( $this->mTitle ) {
 540                         return $this->mTitle->getArticleID();
 541                 } else {
 542                         return 0;
 543                 }
 544         }
 545
 546         /**
 547          * @return bool Whether or not the page exists in the database
 548          */
 549         public function exists() {
 550                 return $this->getId() > 0;
 551         }
 552
 553         /**
 554          * Check if this page is something we're going to be showing
 555          * some sort of sensible content for. If we return false, page
 556          * views (plain action=view) will return an HTTP 404 response,
 557          * so spiders and robots can know they're following a bad link.
 558          *
 559          * @return bool
 560          */
 561         public function hasViewableContent() {
 562                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 563         }
 564
 565         /**
 566          * @return int The view count for the page
 567          */
 568         public function getCount() {
 569                 if ( -1 == $this->mCounter ) {
 570                         $id = $this->getID();
 571                         if ( $id == 0 ) {
 572                                 $this->mCounter = 0;
 573                         } else {
 574                                 $dbr = wfGetDB( DB_SLAVE );
 575                                 $this->mCounter = $dbr->selectField( 'page',
 576                                         'page_counter',
 577                                         array( 'page_id' => $id ),
 578                                         __METHOD__,
 579                                         $this->getSelectOptions()
 580                                 );
 581                         }
 582                 }
 583                 return $this->mCounter;
 584         }
 585
 586         /**
 587          * Determine whether a page  would be suitable for being counted as an
 588          * article in the site_stats table based on the title & its content
 589          *
 590          * @param $text String: text to analyze
 591          * @return bool
 592          */
 593         public function isCountable( $text ) {
 594                 global $wgUseCommaCount;
 595
 596                 $token = $wgUseCommaCount ? ',' : '[[';
 597                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 598         }
 599
 600         /**
 601          * Tests if the article text represents a redirect
 602          *
 603          * @param $text String: FIXME
 604          * @return bool
 605          */
 606         public function isRedirect( $text = false ) {
 607                 if ( $text === false ) {
 608                         if ( $this->mDataLoaded ) {
 609                                 return $this->mIsRedirect;
 610                         }
 611                         // Apparently loadPageData was never called
 612                         $this->loadContent();
 613                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 614                 } else {
 615                         $titleObj = Title::newFromRedirect( $text );
 616                 }
 617                 return $titleObj !== null;
 618         }
 619
 620         /**
 621          * Returns true if the currently-referenced revision is the current edit
 622          * to this page (and it exists).
 623          * @return bool
 624          */
 625         public function isCurrent() {
 626                 # If no oldid, this is the current version.
 627                 if ( $this->getOldID() == 0 ) {
 628                         return true;
 629                 }
 630                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 631         }
 632
 633         /**
 634          * Loads everything except the text
 635          * This isn't necessary for all uses, so it's only done if needed.
 636          */
 637         protected function loadLastEdit() {
 638                 if ( -1 != $this->mUser )
 639                         return;
 640
 641                 # New or non-existent articles have no user information
 642                 $id = $this->getID();
 643                 if ( 0 == $id ) return;
 644
 645                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 646                 if ( !is_null( $this->mLastRevision ) ) {
 647                         $this->mUser      = $this->mLastRevision->getUser();
 648                         $this->mUserText  = $this->mLastRevision->getUserText();
 649                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 650                         $this->mComment   = $this->mLastRevision->getComment();
 651                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 652                         $this->mRevIdFetched = $this->mLastRevision->getId();
 653                 }
 654         }
 655
 656         public function getTimestamp() {
 657                 // Check if the field has been filled by ParserCache::get()
 658                 if ( !$this->mTimestamp ) {
 659                         $this->loadLastEdit();
 660                 }
 661                 return wfTimestamp( TS_MW, $this->mTimestamp );
 662         }
 663
 664         public function getUser() {
 665                 $this->loadLastEdit();
 666                 return $this->mUser;
 667         }
 668
 669         public function getUserText() {
 670                 $this->loadLastEdit();
 671                 return $this->mUserText;
 672         }
 673
 674         public function getComment() {
 675                 $this->loadLastEdit();
 676                 return $this->mComment;
 677         }
 678
 679         public function getMinorEdit() {
 680                 $this->loadLastEdit();
 681                 return $this->mMinorEdit;
 682         }
 683
 684         /* Use this to fetch the rev ID used on page views */
 685         public function getRevIdFetched() {
 686                 $this->loadLastEdit();
 687                 return $this->mRevIdFetched;
 688         }
 689
 690         /**
 691          * @param $limit Integer: default 0.
 692          * @param $offset Integer: default 0.
 693          */
 694         public function getContributors( $limit = 0, $offset = 0 ) {
 695                 # XXX: this is expensive; cache this info somewhere.
 696
 697                 $dbr = wfGetDB( DB_SLAVE );
 698                 $revTable = $dbr->tableName( 'revision' );
 699                 $userTable = $dbr->tableName( 'user' );
 700
 701                 $pageId = $this->getId();
 702
 703                 $user = $this->getUser();
 704                 if ( $user ) {
 705                         $excludeCond = "AND rev_user != $user";
 706                 } else {
 707                         $userText = $dbr->addQuotes( $this->getUserText() );
 708                         $excludeCond = "AND rev_user_text != $userText";
 709                 }
 710
 711                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 712
 713                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 714                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 715                         WHERE rev_page = $pageId
 716                         $excludeCond
 717                         AND $deletedBit = 0
 718                         GROUP BY rev_user, rev_user_text
 719                         ORDER BY timestamp DESC";
 720
 721                 if ( $limit > 0 )
 722                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 723
 724                 $sql .= ' ' . $this->getSelectOptions();
 725                 $res = $dbr->query( $sql, __METHOD__ );
 726
 727                 return new UserArrayFromResult( $res );
 728         }
 729
 730         /**
 731          * This is the default action of the index.php entry point: just view the
 732          * page of the given title.
 733          */
 734         public function view() {
 735                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 736                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 737                 global $wgUseTrackbacks, $wgUseFileCache;
 738
 739                 wfProfileIn( __METHOD__ );
 740
 741                 # Get variables from query string
 742                 $oldid = $this->getOldID();
 743                 $parserCache = ParserCache::singleton();
 744
 745                 $parserOptions = clone $this->getParserOptions();
 746                 # Render printable version, use printable version cache
 747                 if ( $wgOut->isPrintable() ) {
 748                         $parserOptions->setIsPrintable( true );
 749                 }
 750
 751                 # Try client and file cache
 752                 if ( $oldid === 0 && $this->checkTouched() ) {
 753                         global $wgUseETag;
 754                         if ( $wgUseETag ) {
 755                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 756                         }
 757                         # Is is client cached?
 758                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 759                                 wfDebug( __METHOD__ . ": done 304\n" );
 760                                 wfProfileOut( __METHOD__ );
 761                                 return;
 762                         # Try file cache
 763                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 764                                 wfDebug( __METHOD__ . ": done file cache\n" );
 765                                 # tell wgOut that output is taken care of
 766                                 $wgOut->disable();
 767                                 $this->viewUpdates();
 768                                 wfProfileOut( __METHOD__ );
 769                                 return;
 770                         }
 771                 }
 772
 773                 $sk = $wgUser->getSkin();
 774
 775                 # getOldID may want us to redirect somewhere else
 776                 if ( $this->mRedirectUrl ) {
 777                         $wgOut->redirect( $this->mRedirectUrl );
 778                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 779                         wfProfileOut( __METHOD__ );
 780                         return;
 781                 }
 782
 783                 $wgOut->setArticleFlag( true );
 784                 # Set page title (may be overridden by DISPLAYTITLE)
 785                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 786
 787                 # If we got diff in the query, we want to see a diff page instead of the article.
 788                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 789                         wfDebug( __METHOD__ . ": showing diff page\n" );
 790                         $this->showDiffPage();
 791                         wfProfileOut( __METHOD__ );
 792                         return;
 793                 }
 794
 795                 # Should the parser cache be used?
 796                 $useParserCache = $this->useParserCache( $oldid );
 797                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 798                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 799                         wfIncrStats( 'pcache_miss_stub' );
 800                 }
 801
 802                 # For the main page, overwrite the <title> element with the con-
 803                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 804                 # that's not empty).
 805                 if ( $this->mTitle->equals( Title::newMainPage() )
 806                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
 807                 {
 808                         $wgOut->setHTMLTitle( $m );
 809                 }
 810
 811                 $wasRedirected = $this->showRedirectedFromHeader();
 812                 $this->showNamespaceHeader();
 813
 814                 # Iterate through the possible ways of constructing the output text.
 815                 # Keep going until $outputDone is set, or we run out of things to do.
 816                 $pass = 0;
 817                 $outputDone = false;
 818                 while ( !$outputDone && ++$pass ) {
 819                         switch( $pass ) {
 820                                 case 1:
 821                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 822                                         break;
 823
 824                                 case 2:
 825                                         # Try the parser cache
 826                                         if ( $useParserCache ) {
 827                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 828                                                 if ( $this->mParserOutput !== false ) {
 829                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 830                                                         $wgOut->addParserOutput( $this->mParserOutput );
 831                                                         # Ensure that UI elements requiring revision ID have
 832                                                         # the correct version information.
 833                                                         $wgOut->setRevisionId( $this->mLatest );
 834                                                         $outputDone = true;
 835                                                 }
 836                                         }
 837                                         break;
 838
 839                                 case 3:
 840                                         $text = $this->getContent();
 841                                         if ( $text === false || $this->getID() == 0 ) {
 842                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 843                                                 $this->showMissingArticle();
 844                                                 wfProfileOut( __METHOD__ );
 845                                                 return;
 846                                         }
 847
 848                                         # Another whitelist check in case oldid is altering the title
 849                                         if ( !$this->mTitle->userCanRead() ) {
 850                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 851                                                 $wgOut->loginToUse();
 852                                                 $wgOut->output();
 853                                                 $wgOut->disable();
 854                                                 wfProfileOut( __METHOD__ );
 855                                                 return;
 856                                         }
 857
 858                                         # Are we looking at an old revision
 859                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 860                                                 $this->setOldSubtitle( $oldid );
 861                                                 if ( !$this->showDeletedRevisionHeader() ) {
 862                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 863                                                         wfProfileOut( __METHOD__ );
 864                                                         return;
 865                                                 }
 866                                                 # If this "old" version is the current, then try the parser cache...
 867                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 868                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 869                                                         if ( $this->mParserOutput ) {
 870                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 871                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 872                                                                 $wgOut->setRevisionId( $this->mLatest );
 873                                                                 $this->showViewFooter();
 874                                                                 $this->viewUpdates();
 875                                                                 wfProfileOut( __METHOD__ );
 876                                                                 return;
 877                                                         }
 878                                                 }
 879                                         }
 880
 881                                         # Ensure that UI elements requiring revision ID have
 882                                         # the correct version information.
 883                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 884
 885                                         # Pages containing custom CSS or JavaScript get special treatment
 886                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 887                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 888                                                 $this->showCssOrJsPage();
 889                                                 $outputDone = true;
 890                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 891                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 892                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 893                                                 # Don't append the subtitle if this was an old revision
 894                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 895                                                 # Parse just to get categories, displaytitle, etc.
 896                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 897                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 898                                                 $outputDone = true;
 899                                         }
 900                                         break;
 901
 902                                 case 4:
 903                                         # Run the parse, protected by a pool counter
 904                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 905                                         $key = $parserCache->getKey( $this, $parserOptions );
 906                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
 907                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
 908                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
 909
 910                                         if ( !$status->isOK() ) {
 911                                                 # Connection or timeout error
 912                                                 $this->showPoolError( $status );
 913                                                 wfProfileOut( __METHOD__ );
 914                                                 return;
 915                                         } else {
 916                                                 $outputDone = true;
 917                                         }
 918                                         break;
 919
 920                                 # Should be unreachable, but just in case...
 921                                 default:
 922                                         break 2;
 923                         }
 924                 }
 925
 926                 # Now that we've filled $this->mParserOutput, we know whether
 927                 # there are any __NOINDEX__ tags on the page
 928                 $policy = $this->getRobotPolicy( 'view' );
 929                 $wgOut->setIndexPolicy( $policy['index'] );
 930                 $wgOut->setFollowPolicy( $policy['follow'] );
 931
 932                 $this->showViewFooter();
 933                 $this->viewUpdates();
 934                 wfProfileOut( __METHOD__ );
 935         }
 936
 937         /**
 938          * Show a diff page according to current request variables. For use within
 939          * Article::view() only, other callers should use the DifferenceEngine class.
 940          */
 941         public function showDiffPage() {
 942                 global $wgOut, $wgRequest, $wgUser;
 943
 944                 $diff = $wgRequest->getVal( 'diff' );
 945                 $rcid = $wgRequest->getVal( 'rcid' );
 946                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 947                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 948                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 949                 $oldid = $this->getOldID();
 950
 951                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
 952                 // DifferenceEngine directly fetched the revision:
 953                 $this->mRevIdFetched = $de->mNewid;
 954                 $de->showDiffPage( $diffOnly );
 955
 956                 // Needed to get the page's current revision
 957                 $this->loadPageData();
 958                 if ( $diff == 0 || $diff == $this->mLatest ) {
 959                         # Run view updates for current revision only
 960                         $this->viewUpdates();
 961                 }
 962         }
 963
 964         /**
 965          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 966          * Article::view() only.
 967          *
 968          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 969          * page views.
 970          */
 971         public function showCssOrJsPage() {
 972                 global $wgOut;
 973                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 974                 // Give hooks a chance to customise the output
 975                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 976                         // Wrap the whole lot in a <pre> and don't parse
 977                         $m = array();
 978                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 979                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 980                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 981                         $wgOut->addHTML( "\n</pre>\n" );
 982                 }
 983         }
 984
 985         /**
 986          * Get the robot policy to be used for the current action=view request.
 987          * @return String the policy that should be set
 988          * @deprecated use getRobotPolicy() instead, which returns an associative
 989          *    array
 990          */
 991         public function getRobotPolicyForView() {
 992                 wfDeprecated( __FUNC__ );
 993                 $policy = $this->getRobotPolicy( 'view' );
 994                 return $policy['index'] . ',' . $policy['follow'];
 995         }
 996
 997         /**
 998          * Get the robot policy to be used for the current view
 999          * @param $action String the action= GET parameter
1000          * @return Array the policy that should be set
1001          * TODO: actions other than 'view'
1002          */
1003         public function getRobotPolicy( $action ) {
1004
1005                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1006                 global $wgDefaultRobotPolicy, $wgRequest;
1007
1008                 $ns = $this->mTitle->getNamespace();
1009                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1010                         # Don't index user and user talk pages for blocked users (bug 11443)
1011                         if ( !$this->mTitle->isSubpage() ) {
1012                                 $block = new Block();
1013                                 if ( $block->load( $this->mTitle->getText() ) ) {
1014                                         return array( 'index'  => 'noindex',
1015                                                       'follow' => 'nofollow' );
1016                                 }
1017                         }
1018                 }
1019
1020                 if ( $this->getID() === 0 || $this->getOldID() ) {
1021                         # Non-articles (special pages etc), and old revisions
1022                         return array( 'index'  => 'noindex',
1023                                       'follow' => 'nofollow' );
1024                 } elseif ( $wgOut->isPrintable() ) {
1025                         # Discourage indexing of printable versions, but encourage following
1026                         return array( 'index'  => 'noindex',
1027                                       'follow' => 'follow' );
1028                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1029                         # For ?curid=x urls, disallow indexing
1030                         return array( 'index'  => 'noindex',
1031                                       'follow' => 'follow' );
1032                 }
1033
1034                 # Otherwise, construct the policy based on the various config variables.
1035                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1036
1037                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1038                         # Honour customised robot policies for this namespace
1039                         $policy = array_merge( $policy,
1040                                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] ) );
1041                 }
1042                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1043                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1044                         # a final sanity check that we have really got the parser output.
1045                         $policy = array_merge( $policy,
1046                                                array( 'index' => $this->mParserOutput->getIndexPolicy() ) );
1047                 }
1048
1049                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1050                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1051                         $policy = array_merge( $policy,
1052                                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) );
1053                 }
1054
1055                 return $policy;
1056
1057         }
1058
1059         /**
1060          * Converts a String robot policy into an associative array, to allow
1061          * merging of several policies using array_merge().
1062          * @param $policy Mixed, returns empty array on null/false/'', transparent
1063          *            to already-converted arrays, converts String.
1064          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1065          */
1066         public static function formatRobotPolicy( $policy ) {
1067                 if ( is_array( $policy ) ) {
1068                         return $policy;
1069                 } elseif ( !$policy ) {
1070                         return array();
1071                 }
1072
1073                 $policy = explode( ',', $policy );
1074                 $policy = array_map( 'trim', $policy );
1075
1076                 $arr = array();
1077                 foreach ( $policy as $var ) {
1078                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1079                                 $arr['index'] = $var;
1080                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1081                                 $arr['follow'] = $var;
1082                         }
1083                 }
1084                 return $arr;
1085         }
1086
1087         /**
1088          * If this request is a redirect view, send "redirected from" subtitle to
1089          * $wgOut. Returns true if the header was needed, false if this is not a
1090          * redirect view. Handles both local and remote redirects.
1091          */
1092         public function showRedirectedFromHeader() {
1093                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1094
1095                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1096                 $sk = $wgUser->getSkin();
1097                 if ( isset( $this->mRedirectedFrom ) ) {
1098                         // This is an internally redirected page view.
1099                         // We'll need a backlink to the source page for navigation.
1100                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1101                                 $redir = $sk->link(
1102                                         $this->mRedirectedFrom,
1103                                         null,
1104                                         array(),
1105                                         array( 'redirect' => 'no' ),
1106                                         array( 'known', 'noclasses' )
1107                                 );
1108                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1109                                 $wgOut->setSubtitle( $s );
1110
1111                                 // Set the fragment if one was specified in the redirect
1112                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1113                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1114                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1115                                 }
1116
1117                                 // Add a <link rel="canonical"> tag
1118                                 $wgOut->addLink( array( 'rel' => 'canonical',
1119                                         'href' => $this->mTitle->getLocalURL() )
1120                                 );
1121                                 return true;
1122                         }
1123                 } elseif ( $rdfrom ) {
1124                         // This is an externally redirected view, from some other wiki.
1125                         // If it was reported from a trusted site, supply a backlink.
1126                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1127                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1128                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1129                                 $wgOut->setSubtitle( $s );
1130                                 return true;
1131                         }
1132                 }
1133                 return false;
1134         }
1135
1136         /**
1137          * Show a header specific to the namespace currently being viewed, like
1138          * [[MediaWiki:Talkpagetext]]. For Article::view().
1139          */
1140         public function showNamespaceHeader() {
1141                 global $wgOut;
1142                 if ( $this->mTitle->isTalkPage() ) {
1143                         $msg = wfMsgNoTrans( 'talkpageheader' );
1144                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1145                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
1146                         }
1147                 }
1148         }
1149
1150         /**
1151          * Show the footer section of an ordinary page view
1152          */
1153         public function showViewFooter() {
1154                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1155                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1156                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1157                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1158                 }
1159
1160                 # If we have been passed an &rcid= parameter, we want to give the user a
1161                 # chance to mark this new article as patrolled.
1162                 $this->showPatrolFooter();
1163
1164                 # Trackbacks
1165                 if ( $wgUseTrackbacks ) {
1166                         $this->addTrackbacks();
1167                 }
1168         }
1169
1170         /**
1171          * If patrol is possible, output a patrol UI box. This is called from the
1172          * footer section of ordinary page views. If patrol is not possible or not
1173          * desired, does nothing.
1174          */
1175         public function showPatrolFooter() {
1176                 global $wgOut, $wgRequest, $wgUser;
1177                 $rcid = $wgRequest->getVal( 'rcid' );
1178
1179                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1180                         return;
1181                 }
1182
1183                 $sk = $wgUser->getSkin();
1184
1185                 $wgOut->addHTML(
1186                         "<div class='patrollink'>" .
1187                                 wfMsgHtml(
1188                                         'markaspatrolledlink',
1189                                         $sk->link(
1190                                                 $this->mTitle,
1191                                                 wfMsgHtml( 'markaspatrolledtext' ),
1192                                                 array(),
1193                                                 array(
1194                                                         'action' => 'markpatrolled',
1195                                                         'rcid' => $rcid
1196                                                 ),
1197                                                 array( 'known', 'noclasses' )
1198                                         )
1199                                 ) .
1200                         '</div>'
1201                 );
1202         }
1203
1204         /**
1205          * Show the error text for a missing article. For articles in the MediaWiki
1206          * namespace, show the default message text. To be called from Article::view().
1207          */
1208         public function showMissingArticle() {
1209                 global $wgOut, $wgRequest, $wgUser;
1210
1211                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1212                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1213                         $parts = explode( '/', $this->mTitle->getText() );
1214                         $rootPart = $parts[0];
1215                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1216                         $ip = User::isIP( $rootPart );
1217                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1218                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1</div>",
1219                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1220                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1221                                 LogEventsList::showLogExtract(
1222                                         $wgOut,
1223                                         'block',
1224                                         $user->getUserPage()->getPrefixedText(),
1225                                         '',
1226                                         array(
1227                                                 'lim' => 1,
1228                                                 'showIfEmpty' => false,
1229                                                 'msgKey' => array(
1230                                                         'blocked-notice-logextract',
1231                                                         $user->getName() # Support GENDER in notice
1232                                                 )
1233                                         )
1234                                 );
1235                         }
1236                 }
1237                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1238                 # Show delete and move logs
1239                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1240                         array(  'lim' => 10,
1241                                 'conds' => array( "log_action != 'revision'" ),
1242                                 'showIfEmpty' => false,
1243                                 'msgKey' => array( 'moveddeleted-notice' ) )
1244                 );
1245
1246                 # Show error message
1247                 $oldid = $this->getOldID();
1248                 if ( $oldid ) {
1249                         $text = wfMsgNoTrans( 'missing-article',
1250                                 $this->mTitle->getPrefixedText(),
1251                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1252                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1253                         // Use the default message text
1254                         $text = $this->getContent();
1255                 } else {
1256                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1257                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1258                         $errors = array_merge( $createErrors, $editErrors );
1259
1260                         if ( !count( $errors ) )
1261                                 $text = wfMsgNoTrans( 'noarticletext' );
1262                         else
1263                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1264                 }
1265                 $text = "<div class='noarticletext'>\n$text\n</div>";
1266                 if ( !$this->hasViewableContent() ) {
1267                         // If there's no backing content, send a 404 Not Found
1268                         // for better machine handling of broken links.
1269                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1270                 }
1271                 $wgOut->addWikiText( $text );
1272         }
1273
1274         /**
1275          * If the revision requested for view is deleted, check permissions.
1276          * Send either an error message or a warning header to $wgOut.
1277          * Returns true if the view is allowed, false if not.
1278          */
1279         public function showDeletedRevisionHeader() {
1280                 global $wgOut, $wgRequest;
1281                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1282                         // Not deleted
1283                         return true;
1284                 }
1285                 // If the user is not allowed to see it...
1286                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1287                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1288                                 'rev-deleted-text-permission' );
1289                         return false;
1290                 // If the user needs to confirm that they want to see it...
1291                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1292                         # Give explanation and add a link to view the revision...
1293                         $oldid = intval( $this->getOldID() );
1294                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1295                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1296                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1297                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
1298                                 array( $msg, $link ) );
1299                         return false;
1300                 // We are allowed to see...
1301                 } else {
1302                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1303                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1304                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
1305                         return true;
1306                 }
1307         }
1308
1309         /*
1310         * Should the parser cache be used?
1311         */
1312         public function useParserCache( $oldid ) {
1313                 global $wgUser, $wgEnableParserCache;
1314
1315                 return $wgEnableParserCache
1316                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1317                         && $this->exists()
1318                         && empty( $oldid )
1319                         && !$this->mTitle->isCssOrJsPage()
1320                         && !$this->mTitle->isCssJsSubpage();
1321         }
1322
1323         /**
1324          * Execute the uncached parse for action=view
1325          */
1326         public function doViewParse() {
1327                 global $wgOut;
1328                 $oldid = $this->getOldID();
1329                 $useParserCache = $this->useParserCache( $oldid );
1330                 $parserOptions = clone $this->getParserOptions();
1331                 # Render printable version, use printable version cache
1332                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1333                 # Don't show section-edit links on old revisions... this way lies madness.
1334                 $parserOptions->setEditSection( $this->isCurrent() );
1335                 $useParserCache = $this->useParserCache( $oldid );
1336                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1337         }
1338
1339         /**
1340          * Try to fetch an expired entry from the parser cache. If it is present,
1341          * output it and return true. If it is not present, output nothing and
1342          * return false. This is used as a callback function for
1343          * PoolCounter::executeProtected().
1344          */
1345         public function tryDirtyCache() {
1346                 global $wgOut;
1347                 $parserCache = ParserCache::singleton();
1348                 $options = $this->getParserOptions();
1349                 $options->setIsPrintable( $wgOut->isPrintable() );
1350                 $output = $parserCache->getDirty( $this, $options );
1351                 if ( $output ) {
1352                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1353                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1354                         $wgOut->setSquidMaxage( 0 );
1355                         $this->mParserOutput = $output;
1356                         $wgOut->addParserOutput( $output );
1357                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1358                         return true;
1359                 } else {
1360                         wfDebugLog( 'dirty', "dirty missing\n" );
1361                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1362                         return false;
1363                 }
1364         }
1365
1366         /**
1367          * Show an error page for an error from the pool counter.
1368          * @param $status Status
1369          */
1370         public function showPoolError( $status ) {
1371                 global $wgOut;
1372                 $wgOut->clearHTML(); // for release() errors
1373                 $wgOut->enableClientCache( false );
1374                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1375                 $wgOut->addWikiText(
1376                         '<div class="errorbox">' .
1377                         $status->getWikiText( false, 'view-pool-error' ) .
1378                         '</div>'
1379                 );
1380         }
1381
1382         /**
1383          * View redirect
1384          * @param $target Title object or Array of destination(s) to redirect
1385          * @param $appendSubtitle Boolean [optional]
1386          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1387          */
1388         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1389                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1390                 # Display redirect
1391                 if ( !is_array( $target ) ) {
1392                         $target = array( $target );
1393                 }
1394                 $imageDir = $wgContLang->getDir();
1395                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1396                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1397                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1398
1399                 if ( $appendSubtitle ) {
1400                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1401                 }
1402                 $sk = $wgUser->getSkin();
1403                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1404                 $title = array_shift( $target );
1405                 if ( $forceKnown ) {
1406                         $link = $sk->link(
1407                                 $title,
1408                                 htmlspecialchars( $title->getFullText() ),
1409                                 array(),
1410                                 array(),
1411                                 array( 'known', 'noclasses' )
1412                         );
1413                 } else {
1414                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1415                 }
1416                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1417                 foreach ( $target as $rt ) {
1418                         if ( $forceKnown ) {
1419                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1420                                         . $sk->link(
1421                                                 $rt,
1422                                                 htmlspecialchars( $rt->getFullText() ),
1423                                                 array(),
1424                                                 array(),
1425                                                 array( 'known', 'noclasses' )
1426                                         );
1427                         } else {
1428                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1429                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1430                         }
1431                 }
1432                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1433                         '<span class="redirectText">' . $link . '</span>';
1434
1435         }
1436
1437         public function addTrackbacks() {
1438                 global $wgOut, $wgUser;
1439                 $dbr = wfGetDB( DB_SLAVE );
1440                 $tbs = $dbr->select( 'trackbacks',
1441                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1442                         array( 'tb_page' => $this->getID() )
1443                 );
1444                 if ( !$dbr->numRows( $tbs ) ) return;
1445
1446                 $tbtext = "";
1447                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1448                         $rmvtxt = "";
1449                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1450                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1451                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1452                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1453                         }
1454                         $tbtext .= "\n";
1455                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1456                                         $o->tb_title,
1457                                         $o->tb_url,
1458                                         $o->tb_ex,
1459                                         $o->tb_name,
1460                                         $rmvtxt );
1461                 }
1462                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1463                 $this->mTitle->invalidateCache();
1464         }
1465
1466         public function deletetrackback() {
1467                 global $wgUser, $wgRequest, $wgOut;
1468                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1469                         $wgOut->addWikiMsg( 'sessionfailure' );
1470                         return;
1471                 }
1472
1473                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1474                 if ( count( $permission_errors ) ) {
1475                         $wgOut->showPermissionsErrorPage( $permission_errors );
1476                         return;
1477                 }
1478
1479                 $db = wfGetDB( DB_MASTER );
1480                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1481
1482                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1483                 $this->mTitle->invalidateCache();
1484         }
1485
1486         public function render() {
1487                 global $wgOut;
1488                 $wgOut->setArticleBodyOnly( true );
1489                 $this->view();
1490         }
1491
1492         /**
1493          * Handle action=purge
1494          */
1495         public function purge() {
1496                 global $wgUser, $wgRequest, $wgOut;
1497                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1498                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1499                                 $this->doPurge();
1500                                 $this->view();
1501                         }
1502                 } else {
1503                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1504                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1505                         $form = "<form method=\"post\" action=\"$action\">\n" .
1506                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1507                                         "</form>\n";
1508                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1509                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1510                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1511                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1512                         $wgOut->addHTML( $top . $form . $bottom );
1513                 }
1514         }
1515
1516         /**
1517          * Perform the actions of a page purging
1518          */
1519         public function doPurge() {
1520                 global $wgUseSquid;
1521                 // Invalidate the cache
1522                 $this->mTitle->invalidateCache();
1523
1524                 if ( $wgUseSquid ) {
1525                         // Commit the transaction before the purge is sent
1526                         $dbw = wfGetDB( DB_MASTER );
1527                         $dbw->commit();
1528
1529                         // Send purge
1530                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1531                         $update->doUpdate();
1532                 }
1533                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1534                         global $wgMessageCache;
1535                         if ( $this->getID() == 0 ) {
1536                                 $text = false;
1537                         } else {
1538                                 $text = $this->getRawText();
1539                         }
1540                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1541                 }
1542         }
1543
1544         /**
1545          * Insert a new empty page record for this article.
1546          * This *must* be followed up by creating a revision
1547          * and running $this->updateToLatest( $rev_id );
1548          * or else the record will be left in a funky state.
1549          * Best if all done inside a transaction.
1550          *
1551          * @param $dbw Database
1552          * @return int The newly created page_id key, or false if the title already existed
1553          * @private
1554          */
1555         public function insertOn( $dbw ) {
1556                 wfProfileIn( __METHOD__ );
1557
1558                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1559                 $dbw->insert( 'page', array(
1560                         'page_id'           => $page_id,
1561                         'page_namespace'    => $this->mTitle->getNamespace(),
1562                         'page_title'        => $this->mTitle->getDBkey(),
1563                         'page_counter'      => 0,
1564                         'page_restrictions' => '',
1565                         'page_is_redirect'  => 0, # Will set this shortly...
1566                         'page_is_new'       => 1,
1567                         'page_random'       => wfRandom(),
1568                         'page_touched'      => $dbw->timestamp(),
1569                         'page_latest'       => 0, # Fill this in shortly...
1570                         'page_len'          => 0, # Fill this in shortly...
1571                 ), __METHOD__, 'IGNORE' );
1572
1573                 $affected = $dbw->affectedRows();
1574                 if ( $affected ) {
1575                         $newid = $dbw->insertId();
1576                         $this->mTitle->resetArticleId( $newid );
1577                 }
1578                 wfProfileOut( __METHOD__ );
1579                 return $affected ? $newid : false;
1580         }
1581
1582         /**
1583          * Update the page record to point to a newly saved revision.
1584          *
1585          * @param $dbw Database object
1586          * @param $revision Revision: For ID number, and text used to set
1587                             length and redirect status fields
1588          * @param $lastRevision Integer: if given, will not overwrite the page field
1589          *                      when different from the currently set value.
1590          *                      Giving 0 indicates the new page flag should be set
1591          *                      on.
1592          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1593          *                           removing rows in redirect table.
1594          * @return bool true on success, false on failure
1595          * @private
1596          */
1597         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1598                 wfProfileIn( __METHOD__ );
1599
1600                 $text = $revision->getText();
1601                 $rt = Title::newFromRedirect( $text );
1602
1603                 $conditions = array( 'page_id' => $this->getId() );
1604                 if ( !is_null( $lastRevision ) ) {
1605                         # An extra check against threads stepping on each other
1606                         $conditions['page_latest'] = $lastRevision;
1607                 }
1608
1609                 $dbw->update( 'page',
1610                         array( /* SET */
1611                                 'page_latest'      => $revision->getId(),
1612                                 'page_touched'     => $dbw->timestamp(),
1613                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1614                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1615                                 'page_len'         => strlen( $text ),
1616                         ),
1617                         $conditions,
1618                         __METHOD__ );
1619
1620                 $result = $dbw->affectedRows() != 0;
1621                 if ( $result ) {
1622                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1623                 }
1624
1625                 wfProfileOut( __METHOD__ );
1626                 return $result;
1627         }
1628
1629         /**
1630          * Add row to the redirect table if this is a redirect, remove otherwise.
1631          *
1632          * @param $dbw Database
1633          * @param $redirectTitle a title object pointing to the redirect target,
1634          *                       or NULL if this is not a redirect
1635          * @param $lastRevIsRedirect If given, will optimize adding and
1636          *                           removing rows in redirect table.
1637          * @return bool true on success, false on failure
1638          * @private
1639          */
1640         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1641                 // Always update redirects (target link might have changed)
1642                 // Update/Insert if we don't know if the last revision was a redirect or not
1643                 // Delete if changing from redirect to non-redirect
1644                 $isRedirect = !is_null( $redirectTitle );
1645                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1646                         wfProfileIn( __METHOD__ );
1647                         if ( $isRedirect ) {
1648                                 // This title is a redirect, Add/Update row in the redirect table
1649                                 $set = array( /* SET */
1650                                         'rd_namespace' => $redirectTitle->getNamespace(),
1651                                         'rd_title'     => $redirectTitle->getDBkey(),
1652                                         'rd_from'      => $this->getId(),
1653                                 );
1654                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1655                         } else {
1656                                 // This is not a redirect, remove row from redirect table
1657                                 $where = array( 'rd_from' => $this->getId() );
1658                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1659                         }
1660                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1661                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1662                         }
1663                         wfProfileOut( __METHOD__ );
1664                         return ( $dbw->affectedRows() != 0 );
1665                 }
1666                 return true;
1667         }
1668
1669         /**
1670          * If the given revision is newer than the currently set page_latest,
1671          * update the page record. Otherwise, do nothing.
1672          *
1673          * @param $dbw Database object
1674          * @param $revision Revision object
1675          */
1676         public function updateIfNewerOn( &$dbw, $revision ) {
1677                 wfProfileIn( __METHOD__ );
1678                 $row = $dbw->selectRow(
1679                         array( 'revision', 'page' ),
1680                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1681                         array(
1682                                 'page_id' => $this->getId(),
1683                                 'page_latest=rev_id' ),
1684                         __METHOD__ );
1685                 if ( $row ) {
1686                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1687                                 wfProfileOut( __METHOD__ );
1688                                 return false;
1689                         }
1690                         $prev = $row->rev_id;
1691                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1692                 } else {
1693                         # No or missing previous revision; mark the page as new
1694                         $prev = 0;
1695                         $lastRevIsRedirect = null;
1696                 }
1697                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1698                 wfProfileOut( __METHOD__ );
1699                 return $ret;
1700         }
1701
1702         /**
1703          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1704          * @return string Complete article text, or null if error
1705          */
1706         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1707                 wfProfileIn( __METHOD__ );
1708                 if ( strval( $section ) == '' ) {
1709                         // Whole-page edit; let the whole text through
1710                 } else {
1711                         if ( is_null( $edittime ) ) {
1712                                 $rev = Revision::newFromTitle( $this->mTitle );
1713                         } else {
1714                                 $dbw = wfGetDB( DB_MASTER );
1715                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1716                         }
1717                         if ( !$rev ) {
1718                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1719                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1720                                 return null;
1721                         }
1722                         $oldtext = $rev->getText();
1723
1724                         if ( $section == 'new' ) {
1725                                 # Inserting a new section
1726                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1727                                 $text = strlen( trim( $oldtext ) ) > 0
1728                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1729                                                 : "{$subject}{$text}";
1730                         } else {
1731                                 # Replacing an existing section; roll out the big guns
1732                                 global $wgParser;
1733                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1734                         }
1735                 }
1736                 wfProfileOut( __METHOD__ );
1737                 return $text;
1738         }
1739
1740         /**
1741          * This function is not deprecated until somebody fixes the core not to use
1742          * it. Nevertheless, use Article::doEdit() instead.
1743          */
1744         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1745                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1746                         ( $isminor ? EDIT_MINOR : 0 ) |
1747                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1748                         ( $bot ? EDIT_FORCE_BOT : 0 );
1749
1750                 # If this is a comment, add the summary as headline
1751                 if ( $comment && $summary != "" ) {
1752                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1753                 }
1754
1755                 $this->doEdit( $text, $summary, $flags );
1756
1757                 $dbw = wfGetDB( DB_MASTER );
1758                 if ( $watchthis ) {
1759                         if ( !$this->mTitle->userIsWatching() ) {
1760                                 $dbw->begin();
1761                                 $this->doWatch();
1762                                 $dbw->commit();
1763                         }
1764                 } else {
1765                         if ( $this->mTitle->userIsWatching() ) {
1766                                 $dbw->begin();
1767                                 $this->doUnwatch();
1768                                 $dbw->commit();
1769                         }
1770                 }
1771                 $this->doRedirect( $this->isRedirect( $text ) );
1772         }
1773
1774         /**
1775          * @deprecated use Article::doEdit()
1776          */
1777         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1778                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1779                         ( $minor ? EDIT_MINOR : 0 ) |
1780                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1781
1782                 $status = $this->doEdit( $text, $summary, $flags );
1783                 if ( !$status->isOK() ) {
1784                         return false;
1785                 }
1786
1787                 $dbw = wfGetDB( DB_MASTER );
1788                 if ( $watchthis ) {
1789                         if ( !$this->mTitle->userIsWatching() ) {
1790                                 $dbw->begin();
1791                                 $this->doWatch();
1792                                 $dbw->commit();
1793                         }
1794                 } else {
1795                         if ( $this->mTitle->userIsWatching() ) {
1796                                 $dbw->begin();
1797                                 $this->doUnwatch();
1798                                 $dbw->commit();
1799                         }
1800                 }
1801
1802                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1803                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1804
1805                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1806                 return true;
1807         }
1808
1809         /**
1810          * Article::doEdit()
1811          *
1812          * Change an existing article or create a new article. Updates RC and all necessary caches,
1813          * optionally via the deferred update array.
1814          *
1815          * $wgUser must be set before calling this function.
1816          *
1817          * @param $text String: new text
1818          * @param $summary String: edit summary
1819          * @param $flags Integer bitfield:
1820          *      EDIT_NEW
1821          *          Article is known or assumed to be non-existent, create a new one
1822          *      EDIT_UPDATE
1823          *          Article is known or assumed to be pre-existing, update it
1824          *      EDIT_MINOR
1825          *          Mark this edit minor, if the user is allowed to do so
1826          *      EDIT_SUPPRESS_RC
1827          *          Do not log the change in recentchanges
1828          *      EDIT_FORCE_BOT
1829          *          Mark the edit a "bot" edit regardless of user rights
1830          *      EDIT_DEFER_UPDATES
1831          *          Defer some of the updates until the end of index.php
1832          *      EDIT_AUTOSUMMARY
1833          *          Fill in blank summaries with generated text where possible
1834          *
1835          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1836          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1837          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1838          * edit-already-exists error will be returned. These two conditions are also possible with
1839          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1840          *
1841          * @param $baseRevId the revision ID this edit was based off, if any
1842          * @param $user Optional user object, $wgUser will be used if not passed
1843          *
1844          * @return Status object. Possible errors:
1845          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1846          *     edit-gone-missing:       In update mode, but the article didn't exist
1847          *     edit-conflict:           In update mode, the article changed unexpectedly
1848          *     edit-no-change:          Warning that the text was the same as before
1849          *     edit-already-exists:     In creation mode, but the article already exists
1850          *
1851          *  Extensions may define additional errors.
1852          *
1853          *  $return->value will contain an associative array with members as follows:
1854          *     new:                     Boolean indicating if the function attempted to create a new article
1855          *     revision:                The revision object for the inserted revision, or null
1856          *
1857          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1858          */
1859         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1860                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1861
1862                 # Low-level sanity check
1863                 if ( $this->mTitle->getText() == '' ) {
1864                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1865                 }
1866
1867                 wfProfileIn( __METHOD__ );
1868
1869                 $user = is_null( $user ) ? $wgUser : $user;
1870                 $status = Status::newGood( array() );
1871
1872                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1873                 $this->loadPageData();
1874
1875                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1876                         $aid = $this->mTitle->getArticleID();
1877                         if ( $aid ) {
1878                                 $flags |= EDIT_UPDATE;
1879                         } else {
1880                                 $flags |= EDIT_NEW;
1881                         }
1882                 }
1883
1884                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1885                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1886                 {
1887                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1888                         wfProfileOut( __METHOD__ );
1889                         if ( $status->isOK() ) {
1890                                 $status->fatal( 'edit-hook-aborted' );
1891                         }
1892                         return $status;
1893                 }
1894
1895                 # Silently ignore EDIT_MINOR if not allowed
1896                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1897                 $bot = $flags & EDIT_FORCE_BOT;
1898
1899                 $oldtext = $this->getRawText(); // current revision
1900                 $oldsize = strlen( $oldtext );
1901
1902                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1903                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1904                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1905                 }
1906
1907                 $editInfo = $this->prepareTextForEdit( $text );
1908                 $text = $editInfo->pst;
1909                 $newsize = strlen( $text );
1910
1911                 $dbw = wfGetDB( DB_MASTER );
1912                 $now = wfTimestampNow();
1913                 $this->mTimestamp = $now;
1914
1915                 if ( $flags & EDIT_UPDATE ) {
1916                         # Update article, but only if changed.
1917                         $status->value['new'] = false;
1918                         # Make sure the revision is either completely inserted or not inserted at all
1919                         if ( !$wgDBtransactions ) {
1920                                 $userAbort = ignore_user_abort( true );
1921                         }
1922
1923                         $revisionId = 0;
1924
1925                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1926
1927                         if ( $changed ) {
1928                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1929                                   - (int)$this->isCountable( $oldtext );
1930                                 $this->mTotalAdjustment = 0;
1931
1932                                 if ( !$this->mLatest ) {
1933                                         # Article gone missing
1934                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1935                                         $status->fatal( 'edit-gone-missing' );
1936                                         wfProfileOut( __METHOD__ );
1937                                         return $status;
1938                                 }
1939
1940                                 $revision = new Revision( array(
1941                                         'page'       => $this->getId(),
1942                                         'comment'    => $summary,
1943                                         'minor_edit' => $isminor,
1944                                         'text'       => $text,
1945                                         'parent_id'  => $this->mLatest,
1946                                         'user'       => $user->getId(),
1947                                         'user_text'  => $user->getName(),
1948                                         ) );
1949
1950                                 $dbw->begin();
1951                                 $revisionId = $revision->insertOn( $dbw );
1952
1953                                 # Update page
1954                                 #
1955                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1956                                 # during the course of this function. This makes sure that EditPage can detect
1957                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1958                                 # before this function is called. A previous function used a separate query, this
1959                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1960                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1961
1962                                 if ( !$ok ) {
1963                                         /* Belated edit conflict! Run away!! */
1964                                         $status->fatal( 'edit-conflict' );
1965                                         # Delete the invalid revision if the DB is not transactional
1966                                         if ( !$wgDBtransactions ) {
1967                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1968                                         }
1969                                         $revisionId = 0;
1970                                         $dbw->rollback();
1971                                 } else {
1972                                         global $wgUseRCPatrol;
1973                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1974                                         # Update recentchanges
1975                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1976                                                 # Mark as patrolled if the user can do so
1977                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
1978                                                 # Add RC row to the DB
1979                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1980                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1981                                                         $revisionId, $patrolled
1982                                                 );
1983                                                 # Log auto-patrolled edits
1984                                                 if ( $patrolled ) {
1985                                                         PatrolLog::record( $rc, true );
1986                                                 }
1987                                         }
1988                                         $user->incEditCount();
1989                                         $dbw->commit();
1990                                 }
1991                         } else {
1992                                 $status->warning( 'edit-no-change' );
1993                                 $revision = null;
1994                                 // Keep the same revision ID, but do some updates on it
1995                                 $revisionId = $this->getRevIdFetched();
1996                                 // Update page_touched, this is usually implicit in the page update
1997                                 // Other cache updates are done in onArticleEdit()
1998                                 $this->mTitle->invalidateCache();
1999                         }
2000
2001                         if ( !$wgDBtransactions ) {
2002                                 ignore_user_abort( $userAbort );
2003                         }
2004                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2005                         if ( !$status->isOK() ) {
2006                                 wfProfileOut( __METHOD__ );
2007                                 return $status;
2008                         }
2009
2010                         # Invalidate cache of this article and all pages using this article
2011                         # as a template. Partly deferred.
2012                         Article::onArticleEdit( $this->mTitle );
2013                         # Update links tables, site stats, etc.
2014                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2015                 } else {
2016                         # Create new article
2017                         $status->value['new'] = true;
2018
2019                         # Set statistics members
2020                         # We work out if it's countable after PST to avoid counter drift
2021                         # when articles are created with {{subst:}}
2022                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2023                         $this->mTotalAdjustment = 1;
2024
2025                         $dbw->begin();
2026
2027                         # Add the page record; stake our claim on this title!
2028                         # This will return false if the article already exists
2029                         $newid = $this->insertOn( $dbw );
2030
2031                         if ( $newid === false ) {
2032                                 $dbw->rollback();
2033                                 $status->fatal( 'edit-already-exists' );
2034                                 wfProfileOut( __METHOD__ );
2035                                 return $status;
2036                         }
2037
2038                         # Save the revision text...
2039                         $revision = new Revision( array(
2040                                 'page'       => $newid,
2041                                 'comment'    => $summary,
2042                                 'minor_edit' => $isminor,
2043                                 'text'       => $text,
2044                                 'user'       => $user->getId(),
2045                                 'user_text'  => $user->getName(),
2046                                 ) );
2047                         $revisionId = $revision->insertOn( $dbw );
2048
2049                         $this->mTitle->resetArticleID( $newid );
2050
2051                         # Update the page record with revision data
2052                         $this->updateRevisionOn( $dbw, $revision, 0 );
2053
2054                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2055                         # Update recentchanges
2056                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2057                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2058                                 # Mark as patrolled if the user can do so
2059                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2060                                 # Add RC row to the DB
2061                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2062                                         '', strlen( $text ), $revisionId, $patrolled );
2063                                 # Log auto-patrolled edits
2064                                 if ( $patrolled ) {
2065                                         PatrolLog::record( $rc, true );
2066                                 }
2067                         }
2068                         $user->incEditCount();
2069                         $dbw->commit();
2070
2071                         # Update links, etc.
2072                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2073
2074                         # Clear caches
2075                         Article::onArticleCreate( $this->mTitle );
2076
2077                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2078                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2079                 }
2080
2081                 # Do updates right now unless deferral was requested
2082                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2083                         wfDoUpdates();
2084                 }
2085
2086                 // Return the new revision (or null) to the caller
2087                 $status->value['revision'] = $revision;
2088
2089                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2090                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2091
2092                 wfProfileOut( __METHOD__ );
2093                 return $status;
2094         }
2095
2096         /**
2097          * @deprecated wrapper for doRedirect
2098          */
2099         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2100                 wfDeprecated( __METHOD__ );
2101                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2102         }
2103
2104         /**
2105          * Output a redirect back to the article.
2106          * This is typically used after an edit.
2107          *
2108          * @param $noRedir Boolean: add redirect=no
2109          * @param $sectionAnchor String: section to redirect to, including "#"
2110          * @param $extraQuery String: extra query params
2111          */
2112         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2113                 global $wgOut;
2114                 if ( $noRedir ) {
2115                         $query = 'redirect=no';
2116                         if ( $extraQuery )
2117                                 $query .= "&$query";
2118                 } else {
2119                         $query = $extraQuery;
2120                 }
2121                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2122         }
2123
2124         /**
2125          * Mark this particular edit/page as patrolled
2126          */
2127         public function markpatrolled() {
2128                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2129                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2130
2131                 # If we haven't been given an rc_id value, we can't do anything
2132                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2133                 $rc = RecentChange::newFromId( $rcid );
2134                 if ( is_null( $rc ) ) {
2135                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2136                         return;
2137                 }
2138
2139                 # It would be nice to see where the user had actually come from, but for now just guess
2140                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2141                 $return = SpecialPage::getTitleFor( $returnto );
2142
2143                 $dbw = wfGetDB( DB_MASTER );
2144                 $errors = $rc->doMarkPatrolled();
2145
2146                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2147                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2148                         return;
2149                 }
2150
2151                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2152                         // The hook itself has handled any output
2153                         return;
2154                 }
2155
2156                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2157                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2158                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2159                         $wgOut->returnToMain( false, $return );
2160                         return;
2161                 }
2162
2163                 if ( !empty( $errors ) ) {
2164                         $wgOut->showPermissionsErrorPage( $errors );
2165                         return;
2166                 }
2167
2168                 # Inform the user
2169                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2170                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2171                 $wgOut->returnToMain( false, $return );
2172         }
2173
2174         /**
2175          * User-interface handler for the "watch" action
2176          */
2177         public function watch() {
2178                 global $wgUser, $wgOut;
2179                 if ( $wgUser->isAnon() ) {
2180                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2181                         return;
2182                 }
2183                 if ( wfReadOnly() ) {
2184                         $wgOut->readOnlyPage();
2185                         return;
2186                 }
2187                 if ( $this->doWatch() ) {
2188                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2189                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2190                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2191                 }
2192                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2193         }
2194
2195         /**
2196          * Add this page to $wgUser's watchlist
2197          * @return bool true on successful watch operation
2198          */
2199         public function doWatch() {
2200                 global $wgUser;
2201                 if ( $wgUser->isAnon() ) {
2202                         return false;
2203                 }
2204                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2205                         $wgUser->addWatch( $this->mTitle );
2206                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2207                 }
2208                 return false;
2209         }
2210
2211         /**
2212          * User interface handler for the "unwatch" action.
2213          */
2214         public function unwatch() {
2215                 global $wgUser, $wgOut;
2216                 if ( $wgUser->isAnon() ) {
2217                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2218                         return;
2219                 }
2220                 if ( wfReadOnly() ) {
2221                         $wgOut->readOnlyPage();
2222                         return;
2223                 }
2224                 if ( $this->doUnwatch() ) {
2225                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2226                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2227                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2228                 }
2229                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2230         }
2231
2232         /**
2233          * Stop watching a page
2234          * @return bool true on successful unwatch
2235          */
2236         public function doUnwatch() {
2237                 global $wgUser;
2238                 if ( $wgUser->isAnon() ) {
2239                         return false;
2240                 }
2241                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2242                         $wgUser->removeWatch( $this->mTitle );
2243                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2244                 }
2245                 return false;
2246         }
2247
2248         /**
2249          * action=protect handler
2250          */
2251         public function protect() {
2252                 $form = new ProtectionForm( $this );
2253                 $form->execute();
2254         }
2255
2256         /**
2257          * action=unprotect handler (alias)
2258          */
2259         public function unprotect() {
2260                 $this->protect();
2261         }
2262
2263         /**
2264          * Update the article's restriction field, and leave a log entry.
2265          *
2266          * @param $limit Array: set of restriction keys
2267          * @param $reason String
2268          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2269          * @param $expiry Array: per restriction type expiration
2270          * @return bool true on success
2271          */
2272         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2273                 global $wgUser, $wgContLang;
2274
2275                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2276
2277                 $id = $this->mTitle->getArticleID();
2278                 if ( $id <= 0 ) {
2279                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2280                         return false;
2281                 }
2282
2283                 if ( wfReadOnly() ) {
2284                         wfDebug( "updateRestrictions failed: read-only\n" );
2285                         return false;
2286                 }
2287
2288                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2289                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2290                         return false;
2291                 }
2292
2293                 if ( !$cascade ) {
2294                         $cascade = false;
2295                 }
2296
2297                 // Take this opportunity to purge out expired restrictions
2298                 Title::purgeExpiredRestrictions();
2299
2300                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2301                 # we expect a single selection, but the schema allows otherwise.
2302                 $current = array();
2303                 $updated = Article::flattenRestrictions( $limit );
2304                 $changed = false;
2305                 foreach ( $restrictionTypes as $action ) {
2306                         if ( isset( $expiry[$action] ) ) {
2307                                 # Get current restrictions on $action
2308                                 $aLimits = $this->mTitle->getRestrictions( $action );
2309                                 $current[$action] = implode( '', $aLimits );
2310                                 # Are any actual restrictions being dealt with here?
2311                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2312                                 # If something changed, we need to log it. Checking $aRChanged
2313                                 # assures that "unprotecting" a page that is not protected does
2314                                 # not log just because the expiry was "changed".
2315                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2316                                         $changed = true;
2317                                 }
2318                         }
2319                 }
2320
2321                 $current = Article::flattenRestrictions( $current );
2322
2323                 $changed = ( $changed || $current != $updated );
2324                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2325                 $protect = ( $updated != '' );
2326
2327                 # If nothing's changed, do nothing
2328                 if ( $changed ) {
2329                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2330
2331                                 $dbw = wfGetDB( DB_MASTER );
2332
2333                                 # Prepare a null revision to be added to the history
2334                                 $modified = $current != '' && $protect;
2335                                 if ( $protect ) {
2336                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2337                                 } else {
2338                                         $comment_type = 'unprotectedarticle';
2339                                 }
2340                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2341
2342                                 # Only restrictions with the 'protect' right can cascade...
2343                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2344                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2345                                 # The schema allows multiple restrictions
2346                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) )
2347                                         $cascade = false;
2348                                 $cascade_description = '';
2349                                 if ( $cascade ) {
2350                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2351                                 }
2352
2353                                 if ( $reason )
2354                                         $comment .= ": $reason";
2355
2356                                 $editComment = $comment;
2357                                 $encodedExpiry = array();
2358                                 $protect_description = '';
2359                                 foreach ( $limit as $action => $restrictions  ) {
2360                                         if ( !isset( $expiry[$action] ) )
2361                                                 $expiry[$action] = 'infinite';
2362
2363                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2364                                         if ( $restrictions != '' ) {
2365                                                 $protect_description .= "[$action=$restrictions] (";
2366                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2367                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2368                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2369                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2370                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2371                                                 } else {
2372                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2373                                                 }
2374                                                 $protect_description .= ') ';
2375                                         }
2376                                 }
2377                                 $protect_description = trim( $protect_description );
2378
2379                                 if ( $protect_description && $protect )
2380                                         $editComment .= " ($protect_description)";
2381                                 if ( $cascade )
2382                                         $editComment .= "$cascade_description";
2383                                 # Update restrictions table
2384                                 foreach ( $limit as $action => $restrictions ) {
2385                                         if ( $restrictions != '' ) {
2386                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2387                                                         array( 'pr_page' => $id,
2388                                                                 'pr_type' => $action,
2389                                                                 'pr_level' => $restrictions,
2390                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2391                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2392                                         } else {
2393                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2394                                                         'pr_type' => $action ), __METHOD__ );
2395                                         }
2396                                 }
2397
2398                                 # Insert a null revision
2399                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2400                                 $nullRevId = $nullRevision->insertOn( $dbw );
2401
2402                                 $latest = $this->getLatest();
2403                                 # Update page record
2404                                 $dbw->update( 'page',
2405                                         array( /* SET */
2406                                                 'page_touched' => $dbw->timestamp(),
2407                                                 'page_restrictions' => '',
2408                                                 'page_latest' => $nullRevId
2409                                         ), array( /* WHERE */
2410                                                 'page_id' => $id
2411                                         ), 'Article::protect'
2412                                 );
2413
2414                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2415                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2416
2417                                 # Update the protection log
2418                                 $log = new LogPage( 'protect' );
2419                                 if ( $protect ) {
2420                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2421                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2422                                 } else {
2423                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2424                                 }
2425
2426                         } # End hook
2427                 } # End "changed" check
2428
2429                 return true;
2430         }
2431
2432         /**
2433          * Take an array of page restrictions and flatten it to a string
2434          * suitable for insertion into the page_restrictions field.
2435          * @param $limit Array
2436          * @return String
2437          */
2438         protected static function flattenRestrictions( $limit ) {
2439                 if ( !is_array( $limit ) ) {
2440                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2441                 }
2442                 $bits = array();
2443                 ksort( $limit );
2444                 foreach ( $limit as $action => $restrictions ) {
2445                         if ( $restrictions != '' ) {
2446                                 $bits[] = "$action=$restrictions";
2447                         }
2448                 }
2449                 return implode( ':', $bits );
2450         }
2451
2452         /**
2453          * Auto-generates a deletion reason
2454          * @param &$hasHistory Boolean: whether the page has a history
2455          */
2456         public function generateReason( &$hasHistory ) {
2457                 global $wgContLang;
2458                 $dbw = wfGetDB( DB_MASTER );
2459                 // Get the last revision
2460                 $rev = Revision::newFromTitle( $this->mTitle );
2461                 if ( is_null( $rev ) )
2462                         return false;
2463
2464                 // Get the article's contents
2465                 $contents = $rev->getText();
2466                 $blank = false;
2467                 // If the page is blank, use the text from the previous revision,
2468                 // which can only be blank if there's a move/import/protect dummy revision involved
2469                 if ( $contents == '' ) {
2470                         $prev = $rev->getPrevious();
2471                         if ( $prev )    {
2472                                 $contents = $prev->getText();
2473                                 $blank = true;
2474                         }
2475                 }
2476
2477                 // Find out if there was only one contributor
2478                 // Only scan the last 20 revisions
2479                 $res = $dbw->select( 'revision', 'rev_user_text',
2480                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2481                         __METHOD__,
2482                         array( 'LIMIT' => 20 )
2483                 );
2484                 if ( $res === false )
2485                         // This page has no revisions, which is very weird
2486                         return false;
2487
2488                 $hasHistory = ( $res->numRows() > 1 );
2489                 $row = $dbw->fetchObject( $res );
2490                 $onlyAuthor = $row->rev_user_text;
2491                 // Try to find a second contributor
2492                 foreach ( $res as $row ) {
2493                         if ( $row->rev_user_text != $onlyAuthor ) {
2494                                 $onlyAuthor = false;
2495                                 break;
2496                         }
2497                 }
2498                 $dbw->freeResult( $res );
2499
2500                 // Generate the summary with a '$1' placeholder
2501                 if ( $blank ) {
2502                         // The current revision is blank and the one before is also
2503                         // blank. It's just not our lucky day
2504                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2505                 } else {
2506                         if ( $onlyAuthor )
2507                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2508                         else
2509                                 $reason = wfMsgForContent( 'excontent', '$1' );
2510                 }
2511
2512                 if ( $reason == '-' ) {
2513                         // Allow these UI messages to be blanked out cleanly
2514                         return '';
2515                 }
2516
2517                 // Replace newlines with spaces to prevent uglyness
2518                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2519                 // Calculate the maximum amount of chars to get
2520                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2521                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2522                 $contents = $wgContLang->truncate( $contents, $maxLength );
2523                 // Remove possible unfinished links
2524                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2525                 // Now replace the '$1' placeholder
2526                 $reason = str_replace( '$1', $contents, $reason );
2527                 return $reason;
2528         }
2529
2530
2531         /*
2532          * UI entry point for page deletion
2533          */
2534         public function delete() {
2535                 global $wgUser, $wgOut, $wgRequest;
2536
2537                 $confirm = $wgRequest->wasPosted() &&
2538                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2539
2540                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2541                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2542
2543                 $reason = $this->DeleteReasonList;
2544
2545                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2546                         // Entry from drop down menu + additional comment
2547                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2548                 } elseif ( $reason == 'other' ) {
2549                         $reason = $this->DeleteReason;
2550                 }
2551                 # Flag to hide all contents of the archived revisions
2552                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2553
2554                 # This code desperately needs to be totally rewritten
2555
2556                 # Read-only check...
2557                 if ( wfReadOnly() ) {
2558                         $wgOut->readOnlyPage();
2559                         return;
2560                 }
2561
2562                 # Check permissions
2563                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2564
2565                 if ( count( $permission_errors ) > 0 ) {
2566                         $wgOut->showPermissionsErrorPage( $permission_errors );
2567                         return;
2568                 }
2569
2570                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2571
2572                 # Better double-check that it hasn't been deleted yet!
2573                 $dbw = wfGetDB( DB_MASTER );
2574                 $conds = $this->mTitle->pageCond();
2575                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2576                 if ( $latest === false ) {
2577                         $wgOut->showFatalError(
2578                                 Html::rawElement(
2579                                         'div',
2580                                         array( 'class' => 'error mw-error-cannotdelete' ),
2581                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2582                                 )
2583                         );
2584                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2585                         LogEventsList::showLogExtract(
2586                                 $wgOut,
2587                                 'delete',
2588                                 $this->mTitle->getPrefixedText()
2589                         );
2590                         return;
2591                 }
2592
2593                 # Hack for big sites
2594                 $bigHistory = $this->isBigDeletion();
2595                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2596                         global $wgLang, $wgDeleteRevisionsLimit;
2597                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2598                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2599                         return;
2600                 }
2601
2602                 if ( $confirm ) {
2603                         $this->doDelete( $reason, $suppress );
2604                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2605                                 $this->doWatch();
2606                         } elseif ( $this->mTitle->userIsWatching() ) {
2607                                 $this->doUnwatch();
2608                         }
2609                         return;
2610                 }
2611
2612                 // Generate deletion reason
2613                 $hasHistory = false;
2614                 if ( !$reason ) $reason = $this->generateReason( $hasHistory );
2615
2616                 // If the page has a history, insert a warning
2617                 if ( $hasHistory && !$confirm ) {
2618                         global $wgLang;
2619                         $skin = $wgUser->getSkin();
2620                         $revisions = $this->estimateRevisionCount();
2621                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2622                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2623                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2624                                 '</strong>'
2625                         );
2626                         if ( $bigHistory ) {
2627                                 global $wgDeleteRevisionsLimit;
2628                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2629                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2630                         }
2631                 }
2632
2633                 return $this->confirmDelete( $reason );
2634         }
2635
2636         /**
2637          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2638          */
2639         public function isBigDeletion() {
2640                 global $wgDeleteRevisionsLimit;
2641                 if ( $wgDeleteRevisionsLimit ) {
2642                         $revCount = $this->estimateRevisionCount();
2643                         return $revCount > $wgDeleteRevisionsLimit;
2644                 }
2645                 return false;
2646         }
2647
2648         /**
2649          * @return int approximate revision count
2650          */
2651         public function estimateRevisionCount() {
2652                 $dbr = wfGetDB( DB_SLAVE );
2653                 // For an exact count...
2654                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2655                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2656                 return $dbr->estimateRowCount( 'revision', '*',
2657                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2658         }
2659
2660         /**
2661          * Get the last N authors
2662          * @param $num Integer: number of revisions to get
2663          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2664          * @return array Array of authors, duplicates not removed
2665          */
2666         public function getLastNAuthors( $num, $revLatest = 0 ) {
2667                 wfProfileIn( __METHOD__ );
2668                 // First try the slave
2669                 // If that doesn't have the latest revision, try the master
2670                 $continue = 2;
2671                 $db = wfGetDB( DB_SLAVE );
2672                 do {
2673                         $res = $db->select( array( 'page', 'revision' ),
2674                                 array( 'rev_id', 'rev_user_text' ),
2675                                 array(
2676                                         'page_namespace' => $this->mTitle->getNamespace(),
2677                                         'page_title' => $this->mTitle->getDBkey(),
2678                                         'rev_page = page_id'
2679                                 ), __METHOD__, $this->getSelectOptions( array(
2680                                         'ORDER BY' => 'rev_timestamp DESC',
2681                                         'LIMIT' => $num
2682                                 ) )
2683                         );
2684                         if ( !$res ) {
2685                                 wfProfileOut( __METHOD__ );
2686                                 return array();
2687                         }
2688                         $row = $db->fetchObject( $res );
2689                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2690                                 $db = wfGetDB( DB_MASTER );
2691                                 $continue--;
2692                         } else {
2693                                 $continue = 0;
2694                         }
2695                 } while ( $continue );
2696
2697                 $authors = array( $row->rev_user_text );
2698                 while ( $row = $db->fetchObject( $res ) ) {
2699                         $authors[] = $row->rev_user_text;
2700                 }
2701                 wfProfileOut( __METHOD__ );
2702                 return $authors;
2703         }
2704
2705         /**
2706          * Output deletion confirmation dialog
2707          * @param $reason String: prefilled reason
2708          */
2709         public function confirmDelete( $reason ) {
2710                 global $wgOut, $wgUser;
2711
2712                 wfDebug( "Article::confirmDelete\n" );
2713
2714                 $deleteBackLink = $wgUser->getSkin()->link(
2715                         $this->mTitle,
2716                         null,
2717                         array(),
2718                         array(),
2719                         array( 'known', 'noclasses' )
2720                 );
2721                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2722                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2723                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2724
2725                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2726
2727                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
2728                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2729                                         <td></td>
2730                                         <td class='mw-input'><strong>" .
2731                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2732                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2733                                         "</strong></td>
2734                                 </tr>";
2735                 } else {
2736                         $suppress = '';
2737                 }
2738                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2739
2740                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2741                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2742                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2743                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2744                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2745                         "<tr id=\"wpDeleteReasonListRow\">
2746                                 <td class='mw-label'>" .
2747                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2748                                 "</td>
2749                                 <td class='mw-input'>" .
2750                                         Xml::listDropDown( 'wpDeleteReasonList',
2751                                                 wfMsgForContent( 'deletereason-dropdown' ),
2752                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2753                                 "</td>
2754                         </tr>
2755                         <tr id=\"wpDeleteReasonRow\">
2756                                 <td class='mw-label'>" .
2757                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2758                                 "</td>
2759                                 <td class='mw-input'>" .
2760                                 Html::input( 'wpReason', $reason, 'text', array(
2761                                         'size' => '60',
2762                                         'maxlength' => '255',
2763                                         'tabindex' => '2',
2764                                         'id' => 'wpReason',
2765                                         'autofocus'
2766                                 ) ) .
2767                                 "</td>
2768                         </tr>";
2769                 # Dissalow watching is user is not logged in
2770                 if ( $wgUser->isLoggedIn() ) {
2771                         $form .= "
2772                         <tr>
2773                                 <td></td>
2774                                 <td class='mw-input'>" .
2775                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2776                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2777                                 "</td>
2778                         </tr>";
2779                 }
2780                 $form .= "
2781                         $suppress
2782                         <tr>
2783                                 <td></td>
2784                                 <td class='mw-submit'>" .
2785                                         Xml::submitButton( wfMsg( 'deletepage' ),
2786                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2787                                 "</td>
2788                         </tr>" .
2789                         Xml::closeElement( 'table' ) .
2790                         Xml::closeElement( 'fieldset' ) .
2791                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2792                         Xml::closeElement( 'form' );
2793
2794                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2795                                 $skin = $wgUser->getSkin();
2796                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2797                                 $link = $skin->link(
2798                                         $title,
2799                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2800                                         array(),
2801                                         array( 'action' => 'edit' )
2802                                 );
2803                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2804                         }
2805
2806                 $wgOut->addHTML( $form );
2807                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2808                 LogEventsList::showLogExtract(
2809                         $wgOut,
2810                         'delete',
2811                         $this->mTitle->getPrefixedText()
2812                 );
2813         }
2814
2815         /**
2816          * Perform a deletion and output success or failure messages
2817          */
2818         public function doDelete( $reason, $suppress = false ) {
2819                 global $wgOut, $wgUser;
2820                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2821
2822                 $error = '';
2823                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
2824                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2825                                 $deleted = $this->mTitle->getPrefixedText();
2826
2827                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2828                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2829
2830                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2831
2832                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2833                                 $wgOut->returnToMain( false );
2834                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
2835                         }
2836                 } else {
2837                         if ( $error == '' ) {
2838                                 $wgOut->showFatalError(
2839                                         Html::rawElement(
2840                                                 'div',
2841                                                 array( 'class' => 'error mw-error-cannotdelete' ),
2842                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2843                                         )
2844                                 );
2845                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2846                                 LogEventsList::showLogExtract(
2847                                         $wgOut,
2848                                         'delete',
2849                                         $this->mTitle->getPrefixedText()
2850                                 );
2851                         } else {
2852                                 $wgOut->showFatalError( $error );
2853                         }
2854                 }
2855         }
2856
2857         /**
2858          * Back-end article deletion
2859          * Deletes the article with database consistency, writes logs, purges caches
2860          * Returns success
2861          */
2862         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
2863                 global $wgUseSquid, $wgDeferredUpdateList;
2864                 global $wgUseTrackbacks;
2865
2866                 wfDebug( __METHOD__ . "\n" );
2867
2868                 $dbw = wfGetDB( DB_MASTER );
2869                 $ns = $this->mTitle->getNamespace();
2870                 $t = $this->mTitle->getDBkey();
2871                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2872
2873                 if ( $t == '' || $id == 0 ) {
2874                         return false;
2875                 }
2876
2877                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
2878                 array_push( $wgDeferredUpdateList, $u );
2879
2880                 // Bitfields to further suppress the content
2881                 if ( $suppress ) {
2882                         $bitfield = 0;
2883                         // This should be 15...
2884                         $bitfield |= Revision::DELETED_TEXT;
2885                         $bitfield |= Revision::DELETED_COMMENT;
2886                         $bitfield |= Revision::DELETED_USER;
2887                         $bitfield |= Revision::DELETED_RESTRICTED;
2888                 } else {
2889                         $bitfield = 'rev_deleted';
2890                 }
2891
2892                 $dbw->begin();
2893                 // For now, shunt the revision data into the archive table.
2894                 // Text is *not* removed from the text table; bulk storage
2895                 // is left intact to avoid breaking block-compression or
2896                 // immutable storage schemes.
2897                 //
2898                 // For backwards compatibility, note that some older archive
2899                 // table entries will have ar_text and ar_flags fields still.
2900                 //
2901                 // In the future, we may keep revisions and mark them with
2902                 // the rev_deleted field, which is reserved for this purpose.
2903                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2904                         array(
2905                                 'ar_namespace'  => 'page_namespace',
2906                                 'ar_title'      => 'page_title',
2907                                 'ar_comment'    => 'rev_comment',
2908                                 'ar_user'       => 'rev_user',
2909                                 'ar_user_text'  => 'rev_user_text',
2910                                 'ar_timestamp'  => 'rev_timestamp',
2911                                 'ar_minor_edit' => 'rev_minor_edit',
2912                                 'ar_rev_id'     => 'rev_id',
2913                                 'ar_text_id'    => 'rev_text_id',
2914                                 'ar_text'       => '\'\'', // Be explicit to appease
2915                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2916                                 'ar_len'        => 'rev_len',
2917                                 'ar_page_id'    => 'page_id',
2918                                 'ar_deleted'    => $bitfield
2919                         ), array(
2920                                 'page_id' => $id,
2921                                 'page_id = rev_page'
2922                         ), __METHOD__
2923                 );
2924
2925                 # Delete restrictions for it
2926                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2927
2928                 # Now that it's safely backed up, delete it
2929                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2930                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2931                 if ( !$ok ) {
2932                         $dbw->rollback();
2933                         return false;
2934                 }
2935
2936                 # Fix category table counts
2937                 $cats = array();
2938                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2939                 foreach ( $res as $row ) {
2940                         $cats [] = $row->cl_to;
2941                 }
2942                 $this->updateCategoryCounts( array(), $cats );
2943
2944                 # If using cascading deletes, we can skip some explicit deletes
2945                 if ( !$dbw->cascadingDeletes() ) {
2946                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2947
2948                         if ( $wgUseTrackbacks )
2949                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2950
2951                         # Delete outgoing links
2952                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2953                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2954                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2955                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2956                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2957                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2958                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2959                 }
2960
2961                 # If using cleanup triggers, we can skip some manual deletes
2962                 if ( !$dbw->cleanupTriggers() ) {
2963                         # Clean up recentchanges entries...
2964                         $dbw->delete( 'recentchanges',
2965                                 array( 'rc_type != ' . RC_LOG,
2966                                         'rc_namespace' => $this->mTitle->getNamespace(),
2967                                         'rc_title' => $this->mTitle->getDBkey() ),
2968                                 __METHOD__ );
2969                         $dbw->delete( 'recentchanges',
2970                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
2971                                 __METHOD__ );
2972                 }
2973
2974                 # Clear caches
2975                 Article::onArticleDelete( $this->mTitle );
2976
2977                 # Clear the cached article id so the interface doesn't act like we exist
2978                 $this->mTitle->resetArticleID( 0 );
2979
2980                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2981                 $logtype = $suppress ? 'suppress' : 'delete';
2982                 $log = new LogPage( $logtype );
2983
2984                 # Make sure logging got through
2985                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2986
2987                 if ( $commit ) {
2988                         $dbw->commit();
2989                 }
2990
2991                 return true;
2992         }
2993
2994         /**
2995          * Roll back the most recent consecutive set of edits to a page
2996          * from the same user; fails if there are no eligible edits to
2997          * roll back to, e.g. user is the sole contributor. This function
2998          * performs permissions checks on $wgUser, then calls commitRollback()
2999          * to do the dirty work
3000          *
3001          * @param $fromP String: Name of the user whose edits to rollback.
3002          * @param $summary String: Custom summary. Set to default summary if empty.
3003          * @param $token String: Rollback token.
3004          * @param $bot Boolean: If true, mark all reverted edits as bot.
3005          *
3006          * @param $resultDetails Array: contains result-specific array of additional values
3007          *    'alreadyrolled' : 'current' (rev)
3008          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3009          *
3010          * @return array of errors, each error formatted as
3011          *   array(messagekey, param1, param2, ...).
3012          * On success, the array is empty.  This array can also be passed to
3013          * OutputPage::showPermissionsErrorPage().
3014          */
3015         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3016                 global $wgUser;
3017                 $resultDetails = null;
3018
3019                 # Check permissions
3020                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3021                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3022                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3023
3024                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
3025                         $errors[] = array( 'sessionfailure' );
3026
3027                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3028                         $errors[] = array( 'actionthrottledtext' );
3029                 }
3030                 # If there were errors, bail out now
3031                 if ( !empty( $errors ) )
3032                         return $errors;
3033
3034                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3035         }
3036
3037         /**
3038          * Backend implementation of doRollback(), please refer there for parameter
3039          * and return value documentation
3040          *
3041          * NOTE: This function does NOT check ANY permissions, it just commits the
3042          * rollback to the DB Therefore, you should only call this function direct-
3043          * ly if you want to use custom permissions checks. If you don't, use
3044          * doRollback() instead.
3045          */
3046         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3047                 global $wgUseRCPatrol, $wgUser, $wgLang;
3048                 $dbw = wfGetDB( DB_MASTER );
3049
3050                 if ( wfReadOnly() ) {
3051                         return array( array( 'readonlytext' ) );
3052                 }
3053
3054                 # Get the last editor
3055                 $current = Revision::newFromTitle( $this->mTitle );
3056                 if ( is_null( $current ) ) {
3057                         # Something wrong... no page?
3058                         return array( array( 'notanarticle' ) );
3059                 }
3060
3061                 $from = str_replace( '_', ' ', $fromP );
3062                 # User name given should match up with the top revision.
3063                 # If the user was deleted then $from should be empty.
3064                 if ( $from != $current->getUserText() ) {
3065                         $resultDetails = array( 'current' => $current );
3066                         return array( array( 'alreadyrolled',
3067                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3068                                 htmlspecialchars( $fromP ),
3069                                 htmlspecialchars( $current->getUserText() )
3070                         ) );
3071                 }
3072
3073                 # Get the last edit not by this guy...
3074                 # Note: these may not be public values
3075                 $user = intval( $current->getRawUser() );
3076                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3077                 $s = $dbw->selectRow( 'revision',
3078                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3079                         array( 'rev_page' => $current->getPage(),
3080                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3081                         ), __METHOD__,
3082                         array( 'USE INDEX' => 'page_timestamp',
3083                                 'ORDER BY'  => 'rev_timestamp DESC' )
3084                         );
3085                 if ( $s === false ) {
3086                         # No one else ever edited this page
3087                         return array( array( 'cantrollback' ) );
3088                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3089                         # Only admins can see this text
3090                         return array( array( 'notvisiblerev' ) );
3091                 }
3092
3093                 $set = array();
3094                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3095                         # Mark all reverted edits as bot
3096                         $set['rc_bot'] = 1;
3097                 }
3098                 if ( $wgUseRCPatrol ) {
3099                         # Mark all reverted edits as patrolled
3100                         $set['rc_patrolled'] = 1;
3101                 }
3102
3103                 if ( count( $set ) ) {
3104                         $dbw->update( 'recentchanges', $set,
3105                                 array( /* WHERE */
3106                                         'rc_cur_id' => $current->getPage(),
3107                                         'rc_user_text' => $current->getUserText(),
3108                                         "rc_timestamp > '{$s->rev_timestamp}'",
3109                                 ), __METHOD__
3110                         );
3111                 }
3112
3113                 # Generate the edit summary if necessary
3114                 $target = Revision::newFromId( $s->rev_id );
3115                 if ( empty( $summary ) ) {
3116                         if ( $from == '' ) { // no public user name
3117                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3118                         } else {
3119                                 $summary = wfMsgForContent( 'revertpage' );
3120                         }
3121                 }
3122
3123                 # Allow the custom summary to use the same args as the default message
3124                 $args = array(
3125                         $target->getUserText(), $from, $s->rev_id,
3126                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3127                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3128                 );
3129                 $summary = wfMsgReplaceArgs( $summary, $args );
3130
3131                 # Save
3132                 $flags = EDIT_UPDATE;
3133
3134                 if ( $wgUser->isAllowed( 'minoredit' ) )
3135                         $flags |= EDIT_MINOR;
3136
3137                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) )
3138                         $flags |= EDIT_FORCE_BOT;
3139                 # Actually store the edit
3140                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3141                 if ( !empty( $status->value['revision'] ) ) {
3142                         $revId = $status->value['revision']->getId();
3143                 } else {
3144                         $revId = false;
3145                 }
3146
3147                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3148
3149                 $resultDetails = array(
3150                         'summary' => $summary,
3151                         'current' => $current,
3152                         'target'  => $target,
3153                         'newid'   => $revId
3154                 );
3155                 return array();
3156         }
3157
3158         /**
3159          * User interface for rollback operations
3160          */
3161         public function rollback() {
3162                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3163                 $details = null;
3164
3165                 $result = $this->doRollback(
3166                         $wgRequest->getVal( 'from' ),
3167                         $wgRequest->getText( 'summary' ),
3168                         $wgRequest->getVal( 'token' ),
3169                         $wgRequest->getBool( 'bot' ),
3170                         $details
3171                 );
3172
3173                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3174                         $wgOut->rateLimited();
3175                         return;
3176                 }
3177                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3178                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3179                         $errArray = $result[0];
3180                         $errMsg = array_shift( $errArray );
3181                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3182                         if ( isset( $details['current'] ) ) {
3183                                 $current = $details['current'];
3184                                 if ( $current->getComment() != '' ) {
3185                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3186                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3187                                 }
3188                         }
3189                         return;
3190                 }
3191                 # Display permissions errors before read-only message -- there's no
3192                 # point in misleading the user into thinking the inability to rollback
3193                 # is only temporary.
3194                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3195                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
3196                         # move any 'readonlytext' error manually.
3197                         $out = array();
3198                         foreach ( $result as $error ) {
3199                                 if ( $error != array( 'readonlytext' ) ) {
3200                                         $out [] = $error;
3201                                 }
3202                         }
3203                         $wgOut->showPermissionsErrorPage( $out );
3204                         return;
3205                 }
3206                 if ( $result == array( array( 'readonlytext' ) ) ) {
3207                         $wgOut->readOnlyPage();
3208                         return;
3209                 }
3210
3211                 $current = $details['current'];
3212                 $target = $details['target'];
3213                 $newId = $details['newid'];
3214                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3215                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3216                 if ( $current->getUserText() === '' ) {
3217                         $old = wfMsg( 'rev-deleted-user' );
3218                 } else {
3219                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3220                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3221                 }
3222                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3223                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3224                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3225                 $wgOut->returnToMain( false, $this->mTitle );
3226
3227                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3228                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3229                         $de->showDiff( '', '' );
3230                 }
3231         }
3232
3233
3234         /**
3235          * Do standard deferred updates after page view
3236          */
3237         public function viewUpdates() {
3238                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3239                 if ( wfReadOnly() ) {
3240                         return;
3241                 }
3242                 # Don't update page view counters on views from bot users (bug 14044)
3243                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3244                         Article::incViewCount( $this->getID() );
3245                         $u = new SiteStatsUpdate( 1, 0, 0 );
3246                         array_push( $wgDeferredUpdateList, $u );
3247                 }
3248                 # Update newtalk / watchlist notification status
3249                 $wgUser->clearNotification( $this->mTitle );
3250         }
3251
3252         /**
3253          * Prepare text which is about to be saved.
3254          * Returns a stdclass with source, pst and output members
3255          */
3256         public function prepareTextForEdit( $text, $revid = null ) {
3257                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3258                         // Already prepared
3259                         return $this->mPreparedEdit;
3260                 }
3261                 global $wgParser;
3262                 $edit = (object)array();
3263                 $edit->revid = $revid;
3264                 $edit->newText = $text;
3265                 $edit->pst = $this->preSaveTransform( $text );
3266                 $options = $this->getParserOptions();
3267                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3268                 $edit->oldText = $this->getContent();
3269                 $this->mPreparedEdit = $edit;
3270                 return $edit;
3271         }
3272
3273         /**
3274          * Do standard deferred updates after page edit.
3275          * Update links tables, site stats, search index and message cache.
3276          * Purges pages that include this page if the text was changed here.
3277          * Every 100th edit, prune the recent changes table.
3278          *
3279          * @private
3280          * @param $text New text of the article
3281          * @param $summary Edit summary
3282          * @param $minoredit Minor edit
3283          * @param $timestamp_of_pagechange Timestamp associated with the page change
3284          * @param $newid rev_id value of the new revision
3285          * @param $changed Whether or not the content actually changed
3286          */
3287         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3288                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3289
3290                 wfProfileIn( __METHOD__ );
3291
3292                 # Parse the text
3293                 # Be careful not to double-PST: $text is usually already PST-ed once
3294                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3295                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3296                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3297                 } else {
3298                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3299                         $editInfo = $this->mPreparedEdit;
3300                 }
3301
3302                 # Save it to the parser cache
3303                 if ( $wgEnableParserCache ) {
3304                         $popts = $this->getParserOptions();
3305                         $parserCache = ParserCache::singleton();
3306                         $parserCache->save( $editInfo->output, $this, $popts );
3307                 }
3308
3309                 # Update the links tables
3310                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3311                 $u->doUpdate();
3312
3313                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3314
3315                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3316                         if ( 0 == mt_rand( 0, 99 ) ) {
3317                                 // Flush old entries from the `recentchanges` table; we do this on
3318                                 // random requests so as to avoid an increase in writes for no good reason
3319                                 global $wgRCMaxAge;
3320                                 $dbw = wfGetDB( DB_MASTER );
3321                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3322                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3323                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3324                                 $dbw->query( $sql );
3325                         }
3326                 }
3327
3328                 $id = $this->getID();
3329                 $title = $this->mTitle->getPrefixedDBkey();
3330                 $shortTitle = $this->mTitle->getDBkey();
3331
3332                 if ( 0 == $id ) {
3333                         wfProfileOut( __METHOD__ );
3334                         return;
3335                 }
3336
3337                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3338                 array_push( $wgDeferredUpdateList, $u );
3339                 $u = new SearchUpdate( $id, $title, $text );
3340                 array_push( $wgDeferredUpdateList, $u );
3341
3342                 # If this is another user's talk page, update newtalk
3343                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3344                 # load of user talk pages and piss people off, nor if it's a minor edit
3345                 # by a properly-flagged bot.
3346                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3347                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
3348                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3349                                 $other = User::newFromName( $shortTitle, false );
3350                                 if ( !$other ) {
3351                                         wfDebug( __METHOD__ . ": invalid username\n" );
3352                                 } elseif ( User::isIP( $shortTitle ) ) {
3353                                         // An anonymous user
3354                                         $other->setNewtalk( true );
3355                                 } elseif ( $other->isLoggedIn() ) {
3356                                         $other->setNewtalk( true );
3357                                 } else {
3358                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3359                                 }
3360                         }
3361                 }
3362
3363                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3364                         $wgMessageCache->replace( $shortTitle, $text );
3365                 }
3366
3367                 wfProfileOut( __METHOD__ );
3368         }
3369
3370         /**
3371          * Perform article updates on a special page creation.
3372          *
3373          * @param $rev Revision object
3374          *
3375          * @todo This is a shitty interface function. Kill it and replace the
3376          * other shitty functions like editUpdates and such so it's not needed
3377          * anymore.
3378          */
3379         public function createUpdates( $rev ) {
3380                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3381                 $this->mTotalAdjustment = 1;
3382                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3383                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3384         }
3385
3386         /**
3387          * Generate the navigation links when browsing through an article revisions
3388          * It shows the information as:
3389          *   Revision as of \<date\>; view current revision
3390          *   \<- Previous version | Next Version -\>
3391          *
3392          * @param $oldid String: revision ID of this article revision
3393          */
3394         public function setOldSubtitle( $oldid = 0 ) {
3395                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3396
3397                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3398                         return;
3399                 }
3400
3401                 $unhide = $wgRequest->getInt( 'unhide' ) == 1 &&
3402                         $wgUser->matchEditToken( $wgRequest->getVal( 'token' ), $oldid );
3403                 # Cascade unhide param in links for easy deletion browsing
3404                 $extraParams = array();
3405                 if ( $wgRequest->getVal( 'unhide' ) ) {
3406                         $extraParams['unhide'] = 1;
3407                 }
3408                 $revision = Revision::newFromId( $oldid );
3409
3410                 $current = ( $oldid == $this->mLatest );
3411                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3412                 $tddate = $wgLang->date( $this->mTimestamp, true );
3413                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3414                 $sk = $wgUser->getSkin();
3415                 $lnk = $current
3416                         ? wfMsgHtml( 'currentrevisionlink' )
3417                         : $sk->link(
3418                                 $this->mTitle,
3419                                 wfMsgHtml( 'currentrevisionlink' ),
3420                                 array(),
3421                                 $extraParams,
3422                                 array( 'known', 'noclasses' )
3423                         );
3424                 $curdiff = $current
3425                         ? wfMsgHtml( 'diff' )
3426                         : $sk->link(
3427                                 $this->mTitle,
3428                                 wfMsgHtml( 'diff' ),
3429                                 array(),
3430                                 array(
3431                                         'diff' => 'cur',
3432                                         'oldid' => $oldid
3433                                 ) + $extraParams,
3434                                 array( 'known', 'noclasses' )
3435                         );
3436                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3437                 $prevlink = $prev
3438                         ? $sk->link(
3439                                 $this->mTitle,
3440                                 wfMsgHtml( 'previousrevision' ),
3441                                 array(),
3442                                 array(
3443                                         'direction' => 'prev',
3444                                         'oldid' => $oldid
3445                                 ) + $extraParams,
3446                                 array( 'known', 'noclasses' )
3447                         )
3448                         : wfMsgHtml( 'previousrevision' );
3449                 $prevdiff = $prev
3450                         ? $sk->link(
3451                                 $this->mTitle,
3452                                 wfMsgHtml( 'diff' ),
3453                                 array(),
3454                                 array(
3455                                         'diff' => 'prev',
3456                                         'oldid' => $oldid
3457                                 ) + $extraParams,
3458                                 array( 'known', 'noclasses' )
3459                         )
3460                         : wfMsgHtml( 'diff' );
3461                 $nextlink = $current
3462                         ? wfMsgHtml( 'nextrevision' )
3463                         : $sk->link(
3464                                 $this->mTitle,
3465                                 wfMsgHtml( 'nextrevision' ),
3466                                 array(),
3467                                 array(
3468                                         'direction' => 'next',
3469                                         'oldid' => $oldid
3470                                 ) + $extraParams,
3471                                 array( 'known', 'noclasses' )
3472                         );
3473                 $nextdiff = $current
3474                         ? wfMsgHtml( 'diff' )
3475                         : $sk->link(
3476                                 $this->mTitle,
3477                                 wfMsgHtml( 'diff' ),
3478                                 array(),
3479                                 array(
3480                                         'diff' => 'next',
3481                                         'oldid' => $oldid
3482                                 ) + $extraParams,
3483                                 array( 'known', 'noclasses' )
3484                         );
3485
3486                 $cdel = '';
3487                 // User can delete revisions or view deleted revisions...
3488                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3489                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3490                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3491                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3492                         } else {
3493                                 $query = array(
3494                                         'type'   => 'revision',
3495                                         'target' => $this->mTitle->getPrefixedDbkey(),
3496                                         'ids'    => $oldid
3497                                 );
3498                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3499                         }
3500                         $cdel .= ' ';
3501                 }
3502
3503                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3504                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3505
3506                 $m = wfMsg( 'revision-info-current' );
3507                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3508                         ? 'revision-info-current'
3509                         : 'revision-info';
3510
3511                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3512                         wfMsgExt(
3513                                 $infomsg,
3514                                 array( 'parseinline', 'replaceafter' ),
3515                                 $td,
3516                                 $userlinks,
3517                                 $revision->getID(),
3518                                 $tddate,
3519                                 $tdtime,
3520                                 $revision->getUser()
3521                         ) .
3522                         "</div>\n" .
3523                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3524                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3525                 $wgOut->setSubtitle( $r );
3526         }
3527
3528         /**
3529          * This function is called right before saving the wikitext,
3530          * so we can do things like signatures and links-in-context.
3531          *
3532          * @param $text String
3533          */
3534         public function preSaveTransform( $text ) {
3535                 global $wgParser, $wgUser;
3536                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3537         }
3538
3539         /* Caching functions */
3540
3541         /**
3542          * checkLastModified returns true if it has taken care of all
3543          * output to the client that is necessary for this request.
3544          * (that is, it has sent a cached version of the page)
3545          */
3546         protected function tryFileCache() {
3547                 static $called = false;
3548                 if ( $called ) {
3549                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3550                         return false;
3551                 }
3552                 $called = true;
3553                 if ( $this->isFileCacheable() ) {
3554                         $cache = new HTMLFileCache( $this->mTitle );
3555                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3556                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3557                                 $cache->loadFromFileCache();
3558                                 return true;
3559                         } else {
3560                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3561                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3562                         }
3563                 } else {
3564                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3565                 }
3566                 return false;
3567         }
3568
3569         /**
3570          * Check if the page can be cached
3571          * @return bool
3572          */
3573         public function isFileCacheable() {
3574                 $cacheable = false;
3575                 if ( HTMLFileCache::useFileCache() ) {
3576                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3577                         // Extension may have reason to disable file caching on some pages.
3578                         if ( $cacheable ) {
3579                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3580                         }
3581                 }
3582                 return $cacheable;
3583         }
3584
3585         /**
3586          * Loads page_touched and returns a value indicating if it should be used
3587          *
3588          */
3589         public function checkTouched() {
3590                 if ( !$this->mDataLoaded ) {
3591                         $this->loadPageData();
3592                 }
3593                 return !$this->mIsRedirect;
3594         }
3595
3596         /**
3597          * Get the page_touched field
3598          */
3599         public function getTouched() {
3600                 # Ensure that page data has been loaded
3601                 if ( !$this->mDataLoaded ) {
3602                         $this->loadPageData();
3603                 }
3604                 return $this->mTouched;
3605         }
3606
3607         /**
3608          * Get the page_latest field
3609          */
3610         public function getLatest() {
3611                 if ( !$this->mDataLoaded ) {
3612                         $this->loadPageData();
3613                 }
3614                 return (int)$this->mLatest;
3615         }
3616
3617         /**
3618          * Edit an article without doing all that other stuff
3619          * The article must already exist; link tables etc
3620          * are not updated, caches are not flushed.
3621          *
3622          * @param $text String: text submitted
3623          * @param $comment String: comment submitted
3624          * @param $minor Boolean: whereas it's a minor modification
3625          */
3626         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3627                 wfProfileIn( __METHOD__ );
3628
3629                 $dbw = wfGetDB( DB_MASTER );
3630                 $revision = new Revision( array(
3631                         'page'       => $this->getId(),
3632                         'text'       => $text,
3633                         'comment'    => $comment,
3634                         'minor_edit' => $minor ? 1 : 0,
3635                         ) );
3636                 $revision->insertOn( $dbw );
3637                 $this->updateRevisionOn( $dbw, $revision );
3638
3639                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3640
3641                 wfProfileOut( __METHOD__ );
3642         }
3643
3644         /**
3645          * Used to increment the view counter
3646          *
3647          * @param $id Integer: article id
3648          */
3649         public static function incViewCount( $id ) {
3650                 $id = intval( $id );
3651                 global $wgHitcounterUpdateFreq;
3652
3653                 $dbw = wfGetDB( DB_MASTER );
3654                 $pageTable = $dbw->tableName( 'page' );
3655                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3656                 $acchitsTable = $dbw->tableName( 'acchits' );
3657
3658                 if ( $wgHitcounterUpdateFreq <= 1 ) {
3659                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3660                         return;
3661                 }
3662
3663                 # Not important enough to warrant an error page in case of failure
3664                 $oldignore = $dbw->ignoreErrors( true );
3665
3666                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3667
3668                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
3669                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
3670                         # Most of the time (or on SQL errors), skip row count check
3671                         $dbw->ignoreErrors( $oldignore );
3672                         return;
3673                 }
3674
3675                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
3676                 $row = $dbw->fetchObject( $res );
3677                 $rown = intval( $row->n );
3678                 if ( $rown >= $wgHitcounterUpdateFreq ) {
3679                         wfProfileIn( 'Article::incViewCount-collect' );
3680                         $old_user_abort = ignore_user_abort( true );
3681
3682                         $dbType = $dbw->getType();
3683                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
3684                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
3685                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
3686                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
3687                                 'GROUP BY hc_id', __METHOD__ );
3688                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
3689                         $dbw->unlockTables( __METHOD__ );
3690                         if ( $dbType == 'mysql' ) {
3691                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
3692                                         'WHERE page_id = hc_id', __METHOD__ );
3693                         }
3694                         else {
3695                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
3696                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
3697                         }
3698                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
3699
3700                         ignore_user_abort( $old_user_abort );
3701                         wfProfileOut( 'Article::incViewCount-collect' );
3702                 }
3703                 $dbw->ignoreErrors( $oldignore );
3704         }
3705
3706         /**#@+
3707          * The onArticle*() functions are supposed to be a kind of hooks
3708          * which should be called whenever any of the specified actions
3709          * are done.
3710          *
3711          * This is a good place to put code to clear caches, for instance.
3712          *
3713          * This is called on page move and undelete, as well as edit
3714          *
3715          * @param $title a title object
3716          */
3717         public static function onArticleCreate( $title ) {
3718                 # Update existence markers on article/talk tabs...
3719                 if ( $title->isTalkPage() ) {
3720                         $other = $title->getSubjectPage();
3721                 } else {
3722                         $other = $title->getTalkPage();
3723                 }
3724                 $other->invalidateCache();
3725                 $other->purgeSquid();
3726
3727                 $title->touchLinks();
3728                 $title->purgeSquid();
3729                 $title->deleteTitleProtection();
3730         }
3731
3732         public static function onArticleDelete( $title ) {
3733                 global $wgMessageCache;
3734                 # Update existence markers on article/talk tabs...
3735                 if ( $title->isTalkPage() ) {
3736                         $other = $title->getSubjectPage();
3737                 } else {
3738                         $other = $title->getTalkPage();
3739                 }
3740                 $other->invalidateCache();
3741                 $other->purgeSquid();
3742
3743                 $title->touchLinks();
3744                 $title->purgeSquid();
3745
3746                 # File cache
3747                 HTMLFileCache::clearFileCache( $title );
3748
3749                 # Messages
3750                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3751                         $wgMessageCache->replace( $title->getDBkey(), false );
3752                 }
3753                 # Images
3754                 if ( $title->getNamespace() == NS_FILE ) {
3755                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3756                         $update->doUpdate();
3757                 }
3758                 # User talk pages
3759                 if ( $title->getNamespace() == NS_USER_TALK ) {
3760                         $user = User::newFromName( $title->getText(), false );
3761                         $user->setNewtalk( false );
3762                 }
3763                 # Image redirects
3764                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3765         }
3766
3767         /**
3768          * Purge caches on page update etc
3769          */
3770         public static function onArticleEdit( $title, $flags = '' ) {
3771                 global $wgDeferredUpdateList;
3772
3773                 // Invalidate caches of articles which include this page
3774                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3775
3776                 // Invalidate the caches of all pages which redirect here
3777                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3778
3779                 # Purge squid for this page only
3780                 $title->purgeSquid();
3781
3782                 # Clear file cache for this page only
3783                 HTMLFileCache::clearFileCache( $title );
3784         }
3785
3786         /**#@-*/
3787
3788         /**
3789          * Overriden by ImagePage class, only present here to avoid a fatal error
3790          * Called for ?action=revert
3791          */
3792         public function revert() {
3793                 global $wgOut;
3794                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3795         }
3796
3797         /**
3798          * Info about this page
3799          * Called for ?action=info when $wgAllowPageInfo is on.
3800          */
3801         public function info() {
3802                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3803
3804                 if ( !$wgAllowPageInfo ) {
3805                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3806                         return;
3807                 }
3808
3809                 $page = $this->mTitle->getSubjectPage();
3810
3811                 $wgOut->setPagetitle( $page->getPrefixedText() );
3812                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3813                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3814
3815                 if ( !$this->mTitle->exists() ) {
3816                         $wgOut->addHTML( '<div class="noarticletext">' );
3817                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3818                                 // This doesn't quite make sense; the user is asking for
3819                                 // information about the _page_, not the message... -- RC
3820                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3821                         } else {
3822                                 $msg = $wgUser->isLoggedIn()
3823                                         ? 'noarticletext'
3824                                         : 'noarticletextanon';
3825                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3826                         }
3827                         $wgOut->addHTML( '</div>' );
3828                 } else {
3829                         $dbr = wfGetDB( DB_SLAVE );
3830                         $wl_clause = array(
3831                                 'wl_title'     => $page->getDBkey(),
3832                                 'wl_namespace' => $page->getNamespace() );
3833                         $numwatchers = $dbr->selectField(
3834                                 'watchlist',
3835                                 'COUNT(*)',
3836                                 $wl_clause,
3837                                 __METHOD__,
3838                                 $this->getSelectOptions() );
3839
3840                         $pageInfo = $this->pageCountInfo( $page );
3841                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3842
3843                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3844                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3845                         if ( $talkInfo ) {
3846                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3847                         }
3848                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3849                         if ( $talkInfo ) {
3850                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3851                         }
3852                         $wgOut->addHTML( '</ul>' );
3853                 }
3854         }
3855
3856         /**
3857          * Return the total number of edits and number of unique editors
3858          * on a given page. If page does not exist, returns false.
3859          *
3860          * @param $title Title object
3861          * @return array
3862          */
3863         public function pageCountInfo( $title ) {
3864                 $id = $title->getArticleId();
3865                 if ( $id == 0 ) {
3866                         return false;
3867                 }
3868                 $dbr = wfGetDB( DB_SLAVE );
3869                 $rev_clause = array( 'rev_page' => $id );
3870                 $edits = $dbr->selectField(
3871                         'revision',
3872                         'COUNT(rev_page)',
3873                         $rev_clause,
3874                         __METHOD__,
3875                         $this->getSelectOptions()
3876                 );
3877                 $authors = $dbr->selectField(
3878                         'revision',
3879                         'COUNT(DISTINCT rev_user_text)',
3880                         $rev_clause,
3881                         __METHOD__,
3882                         $this->getSelectOptions()
3883                 );
3884                 return array( 'edits' => $edits, 'authors' => $authors );
3885         }
3886
3887         /**
3888          * Return a list of templates used by this article.
3889          * Uses the templatelinks table
3890          *
3891          * @return Array of Title objects
3892          */
3893         public function getUsedTemplates() {
3894                 $result = array();
3895                 $id = $this->mTitle->getArticleID();
3896                 if ( $id == 0 ) {
3897                         return array();
3898                 }
3899                 $dbr = wfGetDB( DB_SLAVE );
3900                 $res = $dbr->select( array( 'templatelinks' ),
3901                         array( 'tl_namespace', 'tl_title' ),
3902                         array( 'tl_from' => $id ),
3903                         __METHOD__ );
3904                 if ( $res !== false ) {
3905                         foreach ( $res as $row ) {
3906                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3907                         }
3908                 }
3909                 $dbr->freeResult( $res );
3910                 return $result;
3911         }
3912
3913         /**
3914          * Returns a list of hidden categories this page is a member of.
3915          * Uses the page_props and categorylinks tables.
3916          *
3917          * @return Array of Title objects
3918          */
3919         public function getHiddenCategories() {
3920                 $result = array();
3921                 $id = $this->mTitle->getArticleID();
3922                 if ( $id == 0 ) {
3923                         return array();
3924                 }
3925                 $dbr = wfGetDB( DB_SLAVE );
3926                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3927                         array( 'cl_to' ),
3928                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3929                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3930                         __METHOD__ );
3931                 if ( $res !== false ) {
3932                         foreach ( $res as $row ) {
3933                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3934                         }
3935                 }
3936                 $dbr->freeResult( $res );
3937                 return $result;
3938         }
3939
3940         /**
3941         * Return an applicable autosummary if one exists for the given edit.
3942         * @param $oldtext String: the previous text of the page.
3943         * @param $newtext String: The submitted text of the page.
3944         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3945         * @return string An appropriate autosummary, or an empty string.
3946         */
3947         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3948                 # Decide what kind of autosummary is needed.
3949
3950                 # Redirect autosummaries
3951                 $ot = Title::newFromRedirect( $oldtext );
3952                 $rt = Title::newFromRedirect( $newtext );
3953                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3954                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3955                 }
3956
3957                 # New page autosummaries
3958                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
3959                         # If they're making a new article, give its text, truncated, in the summary.
3960                         global $wgContLang;
3961                         $truncatedtext = $wgContLang->truncate(
3962                                 str_replace( "\n", ' ', $newtext ),
3963                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3964                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3965                 }
3966
3967                 # Blanking autosummaries
3968                 if ( $oldtext != '' && $newtext == '' ) {
3969                         return wfMsgForContent( 'autosumm-blank' );
3970                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
3971                         # Removing more than 90% of the article
3972                         global $wgContLang;
3973                         $truncatedtext = $wgContLang->truncate(
3974                                 $newtext,
3975                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3976                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3977                 }
3978
3979                 # If we reach this point, there's no applicable autosummary for our case, so our
3980                 # autosummary is empty.
3981                 return '';
3982         }
3983
3984         /**
3985          * Add the primary page-view wikitext to the output buffer
3986          * Saves the text into the parser cache if possible.
3987          * Updates templatelinks if it is out of date.
3988          *
3989          * @param $text String
3990          * @param $cache Boolean
3991          */
3992         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
3993                 global $wgOut;
3994
3995                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
3996                 $wgOut->addParserOutput( $this->mParserOutput );
3997         }
3998
3999         /**
4000          * This does all the heavy lifting for outputWikitext, except it returns the parser
4001          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4002          * say, embedding thread pages within a discussion system (LiquidThreads)
4003          */
4004         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4005                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4006
4007                 if ( !$parserOptions ) {
4008                         $parserOptions = $this->getParserOptions();
4009                 }
4010
4011                 $time = - wfTime();
4012                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4013                         $parserOptions, true, true, $this->getRevIdFetched() );
4014                 $time += wfTime();
4015
4016                 # Timing hack
4017                 if ( $time > 3 ) {
4018                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4019                                 $this->mTitle->getPrefixedDBkey() ) );
4020                 }
4021
4022                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4023                         $parserCache = ParserCache::singleton();
4024                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4025                 }
4026                 // Make sure file cache is not used on uncacheable content.
4027                 // Output that has magic words in it can still use the parser cache
4028                 // (if enabled), though it will generally expire sooner.
4029                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4030                         $wgUseFileCache = false;
4031                 }
4032                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4033                 return $this->mParserOutput;
4034         }
4035
4036         /**
4037          * Get parser options suitable for rendering the primary article wikitext
4038          */
4039         public function getParserOptions() {
4040                 global $wgUser;
4041                 if ( !$this->mParserOptions ) {
4042                         $this->mParserOptions = new ParserOptions( $wgUser );
4043                         $this->mParserOptions->setTidy( true );
4044                         $this->mParserOptions->enableLimitReport();
4045                 }
4046                 return $this->mParserOptions;
4047         }
4048
4049         protected function doCascadeProtectionUpdates( $parserOutput ) {
4050                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4051                         return;
4052                 }
4053
4054                 // templatelinks table may have become out of sync,
4055                 // especially if using variable-based transclusions.
4056                 // For paranoia, check if things have changed and if
4057                 // so apply updates to the database. This will ensure
4058                 // that cascaded protections apply as soon as the changes
4059                 // are visible.
4060
4061                 # Get templates from templatelinks
4062                 $id = $this->mTitle->getArticleID();
4063
4064                 $tlTemplates = array();
4065
4066                 $dbr = wfGetDB( DB_SLAVE );
4067                 $res = $dbr->select( array( 'templatelinks' ),
4068                         array( 'tl_namespace', 'tl_title' ),
4069                         array( 'tl_from' => $id ),
4070                         __METHOD__ );
4071
4072                 global $wgContLang;
4073                 foreach ( $res as $row ) {
4074                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4075                 }
4076
4077                 # Get templates from parser output.
4078                 $poTemplates = array();
4079                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4080                         foreach ( $templates as $dbk => $id ) {
4081                                 $poTemplates["$ns:$dbk"] = true;
4082                         }
4083                 }
4084
4085                 # Get the diff
4086                 # Note that we simulate array_diff_key in PHP <5.0.x
4087                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4088
4089                 if ( count( $templates_diff ) > 0 ) {
4090                         # Whee, link updates time.
4091                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4092                         $u->doUpdate();
4093                 }
4094         }
4095
4096         /**
4097          * Update all the appropriate counts in the category table, given that
4098          * we've added the categories $added and deleted the categories $deleted.
4099          *
4100          * @param $added array   The names of categories that were added
4101          * @param $deleted array The names of categories that were deleted
4102          * @return null
4103          */
4104         public function updateCategoryCounts( $added, $deleted ) {
4105                 $ns = $this->mTitle->getNamespace();
4106                 $dbw = wfGetDB( DB_MASTER );
4107
4108                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4109                 # exist, we might legitimately not create it, but it's simpler to just
4110                 # create it and then give it a negative value, since the value is bogus
4111                 # anyway.
4112                 #
4113                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4114                 $insertCats = array_merge( $added, $deleted );
4115                 if ( !$insertCats ) {
4116                         # Okay, nothing to do
4117                         return;
4118                 }
4119                 $insertRows = array();
4120                 foreach ( $insertCats as $cat ) {
4121                         $insertRows[] = array(
4122                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4123                                 'cat_title' => $cat
4124                         );
4125                 }
4126                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4127
4128                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4129                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4130                 if ( $ns == NS_CATEGORY ) {
4131                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4132                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4133                 } elseif ( $ns == NS_FILE ) {
4134                         $addFields[]    = 'cat_files = cat_files + 1';
4135                         $removeFields[] = 'cat_files = cat_files - 1';
4136                 }
4137
4138                 if ( $added ) {
4139                         $dbw->update(
4140                                 'category',
4141                                 $addFields,
4142                                 array( 'cat_title' => $added ),
4143                                 __METHOD__
4144                         );
4145                 }
4146                 if ( $deleted ) {
4147                         $dbw->update(
4148                                 'category',
4149                                 $removeFields,
4150                                 array( 'cat_title' => $deleted ),
4151                                 __METHOD__
4152                         );
4153                 }
4154         }
4155
4156         /** Lightweight method to get the parser output for a page, checking the parser cache
4157          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4158          * consider, so it's not appropriate to use there.
4159          */
4160         function getParserOutput( $oldid = null ) {
4161                 global $wgEnableParserCache, $wgUser, $wgOut;
4162
4163                 // Should the parser cache be used?
4164                 $useParserCache = $wgEnableParserCache &&
4165                           intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4166                           $this->exists() &&
4167                           $oldid === null;
4168
4169                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4170                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4171                         wfIncrStats( 'pcache_miss_stub' );
4172                 }
4173
4174                 $parserOutput = false;
4175                 if ( $useParserCache ) {
4176                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4177                 }
4178
4179                 if ( $parserOutput === false ) {
4180                         // Cache miss; parse and output it.
4181                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4182
4183                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4184                 } else {
4185                         return $parserOutput;
4186                 }
4187         }
4188 }