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  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         var $mComment = '';               // !<
  21         var $mContent;                    // !<
  22         var $mContentLoaded = false;      // !<
  23         var $mCounter = -1;               // !< Not loaded
  24         var $mCurID = -1;                 // !< Not loaded
  25         var $mDataLoaded = false;         // !<
  26         var $mForUpdate = false;          // !<
  27         var $mGoodAdjustment = 0;         // !<
  28         var $mIsRedirect = false;         // !<
  29         var $mLatest = false;             // !<
  30         var $mMinorEdit;                  // !<
  31         var $mOldId;                      // !<
  32         var $mPreparedEdit = false;       // !< Title object if set
  33         var $mRedirectedFrom = null;      // !< Title object if set
  34         var $mRedirectTarget = null;      // !< Title object if set
  35         var $mRedirectUrl = false;        // !<
  36         var $mRevIdFetched = 0;           // !<
  37         var $mRevision;                   // !< Revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mUser = -1;                  // !< Not loaded
  43         var $mUserText = '';              // !< username from Revision if set
  44         var $mParserOptions;              // !< ParserOptions object
  45         var $mParserOutput;               // !< ParserCache object if set
  46         /**@}}*/
  47
  48         /**
  49          * Constructor and clear the article
  50          * @param $title Reference to a Title object.
  51          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  52          */
  53         public function __construct( Title $title, $oldId = null ) {
  54                 // FIXME: does the reference play any role here?
  55                 $this->mTitle =& $title;
  56                 $this->mOldId = $oldId;
  57         }
  58
  59         /**
  60          * Constructor from an page id
  61          * @param $id The article ID to load
  62          */
  63         public static function newFromID( $id ) {
  64                 $t = Title::newFromID( $id );
  65                 # FIXME: doesn't inherit right
  66                 return $t == null ? null : new self( $t );
  67                 # return $t == null ? null : new static( $t ); // PHP 5.3
  68         }
  69
  70         /**
  71          * Tell the page view functions that this view was redirected
  72          * from another page on the wiki.
  73          * @param $from Title object.
  74          */
  75         public function setRedirectedFrom( Title $from ) {
  76                 $this->mRedirectedFrom = $from;
  77         }
  78
  79         /**
  80          * If this page is a redirect, get its target
  81          *
  82          * The target will be fetched from the redirect table if possible.
  83          * If this page doesn't have an entry there, call insertRedirect()
  84          * @return mixed Title object, or null if this page is not a redirect
  85          */
  86         public function getRedirectTarget() {
  87                 if ( !$this->mTitle->isRedirect() ) {
  88                         return null;
  89                 }
  90
  91                 if ( $this->mRedirectTarget !== null ) {
  92                         return $this->mRedirectTarget;
  93                 }
  94
  95                 # Query the redirect table
  96                 $dbr = wfGetDB( DB_SLAVE );
  97                 $row = $dbr->selectRow( 'redirect',
  98                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  99                         array( 'rd_from' => $this->getID() ),
 100                         __METHOD__
 101                 );
 102
 103                 // rd_fragment and rd_interwiki were added later, populate them if empty
 104                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 105                         return $this->mRedirectTarget = Title::makeTitle(
 106                                 $row->rd_namespace, $row->rd_title,
 107                                 $row->rd_fragment, $row->rd_interwiki );
 108                 }
 109
 110                 # This page doesn't have an entry in the redirect table
 111                 return $this->mRedirectTarget = $this->insertRedirect();
 112         }
 113
 114         /**
 115          * Insert an entry for this page into the redirect table.
 116          *
 117          * Don't call this function directly unless you know what you're doing.
 118          * @return Title object or null if not a redirect
 119          */
 120         public function insertRedirect() {
 121                 // recurse through to only get the final target
 122                 $retval = Title::newFromRedirectRecurse( $this->getContent() );
 123                 if ( !$retval ) {
 124                         return null;
 125                 }
 126                 $this->insertRedirectEntry( $retval );
 127                 return $retval;
 128         }
 129
 130         /**
 131          * Insert or update the redirect table entry for this page to indicate
 132          * it redirects to $rt .
 133          * @param $rt Title redirect target
 134          */
 135         public function insertRedirectEntry( $rt ) {
 136                 $dbw = wfGetDB( DB_MASTER );
 137                 $dbw->replace( 'redirect', array( 'rd_from' ),
 138                         array(
 139                                 'rd_from' => $this->getID(),
 140                                 'rd_namespace' => $rt->getNamespace(),
 141                                 'rd_title' => $rt->getDBkey(),
 142                                 'rd_fragment' => $rt->getFragment(),
 143                                 'rd_interwiki' => $rt->getInterwiki(),
 144                         ),
 145                         __METHOD__
 146                 );
 147         }
 148
 149         /**
 150          * Get the Title object or URL this page redirects to
 151          *
 152          * @return mixed false, Title of in-wiki target, or string with URL
 153          */
 154         public function followRedirect() {
 155                 return $this->getRedirectURL( $this->getRedirectTarget() );
 156         }
 157
 158         /**
 159          * Get the Title object this text redirects to
 160          *
 161          * @param $text string article content containing redirect info
 162          * @return mixed false, Title of in-wiki target, or string with URL
 163          * @deprecated
 164          */
 165         public function followRedirectText( $text ) {
 166                 // recurse through to only get the final target
 167                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 168         }
 169
 170         /**
 171          * Get the Title object or URL to use for a redirect. We use Title
 172          * objects for same-wiki, non-special redirects and URLs for everything
 173          * else.
 174          * @param $rt Title Redirect target
 175          * @return mixed false, Title object of local target, or string with URL
 176          */
 177         public function getRedirectURL( $rt ) {
 178                 if ( $rt ) {
 179                         if ( $rt->getInterwiki() != '' ) {
 180                                 if ( $rt->isLocal() ) {
 181                                         // Offsite wikis need an HTTP redirect.
 182                                         //
 183                                         // This can be hard to reverse and may produce loops,
 184                                         // so they may be disabled in the site configuration.
 185                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 186                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 187                                 }
 188                         } else {
 189                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 190                                         // Gotta handle redirects to special pages differently:
 191                                         // Fill the HTTP response "Location" header and ignore
 192                                         // the rest of the page we're on.
 193                                         //
 194                                         // This can be hard to reverse, so they may be disabled.
 195                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 196                                                 // rolleyes
 197                                         } else {
 198                                                 return $rt->getFullURL();
 199                                         }
 200                                 }
 201
 202                                 return $rt;
 203                         }
 204                 }
 205
 206                 // No or invalid redirect
 207                 return false;
 208         }
 209
 210         /**
 211          * Get the title object of the article
 212          * @return Title object of this page
 213          */
 214         public function getTitle() {
 215                 return $this->mTitle;
 216         }
 217
 218         /**
 219          * Clear the object
 220          * FIXME: shouldn't this be public?
 221          * @private
 222          */
 223         public function clear() {
 224                 $this->mDataLoaded    = false;
 225                 $this->mContentLoaded = false;
 226
 227                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 228                 $this->mRedirectedFrom = null; # Title object if set
 229                 $this->mRedirectTarget = null; # Title object if set
 230                 $this->mUserText =
 231                 $this->mTimestamp = $this->mComment = '';
 232                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 233                 $this->mTouched = '19700101000000';
 234                 $this->mForUpdate = false;
 235                 $this->mIsRedirect = false;
 236                 $this->mRevIdFetched = 0;
 237                 $this->mRedirectUrl = false;
 238                 $this->mLatest = false;
 239                 $this->mPreparedEdit = false;
 240         }
 241
 242         /**
 243          * Note that getContent/loadContent do not follow redirects anymore.
 244          * If you need to fetch redirectable content easily, try
 245          * the shortcut in Article::followRedirect()
 246          *
 247          * This function has side effects! Do not use this function if you
 248          * only want the real revision text if any.
 249          *
 250          * @return Return the text of this revision
 251          */
 252         public function getContent() {
 253                 global $wgUser, $wgContLang, $wgMessageCache;
 254
 255                 wfProfileIn( __METHOD__ );
 256
 257                 if ( $this->getID() === 0 ) {
 258                         # If this is a MediaWiki:x message, then load the messages
 259                         # and return the message value for x.
 260                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 261                                 # If this is a system message, get the default text.
 262                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 263                                 $text = wfMsgGetKey( $message, false, $lang, false );
 264
 265                                 if ( wfEmptyMsg( $message, $text ) )
 266                                         $text = '';
 267                         } else {
 268                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 269                         }
 270                         wfProfileOut( __METHOD__ );
 271
 272                         return $text;
 273                 } else {
 274                         $this->loadContent();
 275                         wfProfileOut( __METHOD__ );
 276
 277                         return $this->mContent;
 278                 }
 279         }
 280
 281         /**
 282          * Get the text of the current revision. No side-effects...
 283          *
 284          * @return Return the text of the current revision
 285          */
 286         public function getRawText() {
 287                 // Check process cache for current revision
 288                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 289                         return $this->mContent;
 290                 }
 291
 292                 $rev = Revision::newFromTitle( $this->mTitle );
 293                 $text = $rev ? $rev->getRawText() : false;
 294
 295                 return $text;
 296         }
 297
 298         /**
 299          * This function returns the text of a section, specified by a number ($section).
 300          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 301          * the first section before any such heading (section 0).
 302          *
 303          * If a section contains subsections, these are also returned.
 304          *
 305          * @param $text String: text to look in
 306          * @param $section Integer: section number
 307          * @return string text of the requested section
 308          * @deprecated
 309          */
 310         public function getSection( $text, $section ) {
 311                 global $wgParser;
 312                 return $wgParser->getSection( $text, $section );
 313         }
 314
 315         /**
 316          * Get the text that needs to be saved in order to undo all revisions
 317          * between $undo and $undoafter. Revisions must belong to the same page,
 318          * must exist and must not be deleted
 319          * @param $undo Revision
 320          * @param $undoafter Revision Must be an earlier revision than $undo
 321          * @return mixed string on success, false on failure
 322          */
 323         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 324                 $undo_text = $undo->getText();
 325                 $undoafter_text = $undoafter->getText();
 326                 $cur_text = $this->getContent();
 327
 328                 if ( $cur_text == $undo_text ) {
 329                         # No use doing a merge if it's just a straight revert.
 330                         return $undoafter_text;
 331                 }
 332
 333                 $undone_text = '';
 334
 335                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 336                         return false;
 337                 }
 338
 339                 return $undone_text;
 340         }
 341
 342         /**
 343          * @return int The oldid of the article that is to be shown, 0 for the
 344          *             current revision
 345          */
 346         public function getOldID() {
 347                 if ( is_null( $this->mOldId ) ) {
 348                         $this->mOldId = $this->getOldIDFromRequest();
 349                 }
 350
 351                 return $this->mOldId;
 352         }
 353
 354         /**
 355          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 356          *
 357          * @return int The old id for the request
 358          */
 359         public function getOldIDFromRequest() {
 360                 global $wgRequest;
 361
 362                 $this->mRedirectUrl = false;
 363
 364                 $oldid = $wgRequest->getVal( 'oldid' );
 365
 366                 if ( isset( $oldid ) ) {
 367                         $oldid = intval( $oldid );
 368                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 369                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 370                                 if ( $nextid ) {
 371                                         $oldid = $nextid;
 372                                 } else {
 373                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 374                                 }
 375                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 376                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 377                                 if ( $previd ) {
 378                                         $oldid = $previd;
 379                                 }
 380                         }
 381                 }
 382
 383                 if ( !$oldid ) {
 384                         $oldid = 0;
 385                 }
 386
 387                 return $oldid;
 388         }
 389
 390         /**
 391          * Load the revision (including text) into this object
 392          */
 393         function loadContent() {
 394                 if ( $this->mContentLoaded ) {
 395                         return;
 396                 }
 397
 398                 wfProfileIn( __METHOD__ );
 399
 400                 $oldid = $this->getOldID();
 401                 $this->mOldId = $oldid;
 402                 $this->fetchContent( $oldid );
 403
 404                 wfProfileOut( __METHOD__ );
 405         }
 406
 407         /**
 408          * Fetch a page record with the given conditions
 409          * @param $dbr Database object
 410          * @param $conditions Array
 411          * @return mixed Database result resource, or false on failure
 412          */
 413         protected function pageData( $dbr, $conditions ) {
 414                 $fields = array(
 415                                 'page_id',
 416                                 'page_namespace',
 417                                 'page_title',
 418                                 'page_restrictions',
 419                                 'page_counter',
 420                                 'page_is_redirect',
 421                                 'page_is_new',
 422                                 'page_random',
 423                                 'page_touched',
 424                                 'page_latest',
 425                                 'page_len',
 426                 );
 427
 428                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 429
 430                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 431
 432                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 433
 434                 return $row;
 435         }
 436
 437         /**
 438          * Fetch a page record matching the Title object's namespace and title
 439          * using a sanitized title string
 440          *
 441          * @param $dbr Database object
 442          * @param $title Title object
 443          * @return mixed Database result resource, or false on failure
 444          */
 445         public function pageDataFromTitle( $dbr, $title ) {
 446                 return $this->pageData( $dbr, array(
 447                         'page_namespace' => $title->getNamespace(),
 448                         'page_title'     => $title->getDBkey() ) );
 449         }
 450
 451         /**
 452          * Fetch a page record matching the requested ID
 453          *
 454          * @param $dbr Database
 455          * @param $id Integer
 456          */
 457         protected function pageDataFromId( $dbr, $id ) {
 458                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 459         }
 460
 461         /**
 462          * Set the general counter, title etc data loaded from
 463          * some source.
 464          *
 465          * @param $data Database row object or "fromdb"
 466          */
 467         public function loadPageData( $data = 'fromdb' ) {
 468                 if ( $data === 'fromdb' ) {
 469                         $dbr = wfGetDB( DB_MASTER );
 470                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 471                 }
 472
 473                 $lc = LinkCache::singleton();
 474
 475                 if ( $data ) {
 476                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 477
 478                         $this->mTitle->mArticleID = intval( $data->page_id );
 479
 480                         # Old-fashioned restrictions
 481                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 482
 483                         $this->mCounter     = intval( $data->page_counter );
 484                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 485                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 486                         $this->mLatest      = intval( $data->page_latest );
 487                 } else {
 488                         $lc->addBadLinkObj( $this->mTitle );
 489                         $this->mTitle->mArticleID = 0;
 490                 }
 491
 492                 $this->mDataLoaded = true;
 493         }
 494
 495         /**
 496          * Get text of an article from database
 497          * Does *NOT* follow redirects.
 498          *
 499          * @param $oldid Int: 0 for whatever the latest revision is
 500          * @return mixed string containing article contents, or false if null
 501          */
 502         function fetchContent( $oldid = 0 ) {
 503                 if ( $this->mContentLoaded ) {
 504                         return $this->mContent;
 505                 }
 506
 507                 $dbr = wfGetDB( DB_MASTER );
 508
 509                 # Pre-fill content with error message so that if something
 510                 # fails we'll have something telling us what we intended.
 511                 $t = $this->mTitle->getPrefixedText();
 512                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 513                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 514
 515                 if ( $oldid ) {
 516                         $revision = Revision::newFromId( $oldid );
 517                         if ( $revision === null ) {
 518                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 519                                 return false;
 520                         }
 521
 522                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 523
 524                         if ( !$data ) {
 525                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 526                                 return false;
 527                         }
 528
 529                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 530                         $this->loadPageData( $data );
 531                 } else {
 532                         if ( !$this->mDataLoaded ) {
 533                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 534
 535                                 if ( !$data ) {
 536                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 537                                         return false;
 538                                 }
 539
 540                                 $this->loadPageData( $data );
 541                         }
 542                         $revision = Revision::newFromId( $this->mLatest );
 543                         if (  $revision === null ) {
 544                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 545                                 return false;
 546                         }
 547                 }
 548
 549                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 550                 // We should instead work with the Revision object when we need it...
 551                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 552
 553                 $this->mUser      = $revision->getUser();
 554                 $this->mUserText  = $revision->getUserText();
 555                 $this->mComment   = $revision->getComment();
 556                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 557
 558                 $this->mRevIdFetched = $revision->getId();
 559                 $this->mContentLoaded = true;
 560                 $this->mRevision =& $revision;
 561
 562                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 563
 564                 return $this->mContent;
 565         }
 566
 567         /**
 568          * Read/write accessor to select FOR UPDATE
 569          *
 570          * @param $x Mixed: FIXME
 571          * @return mixed value of $x, or value stored in Article::mForUpdate
 572          */
 573         public function forUpdate( $x = null ) {
 574                 return wfSetVar( $this->mForUpdate, $x );
 575         }
 576
 577         /**
 578          * Get options for all SELECT statements
 579          *
 580          * @param $options Array: an optional options array which'll be appended to
 581          *                       the default
 582          * @return Array: options
 583          */
 584         protected function getSelectOptions( $options = '' ) {
 585                 if ( $this->mForUpdate ) {
 586                         if ( is_array( $options ) ) {
 587                                 $options[] = 'FOR UPDATE';
 588                         } else {
 589                                 $options = 'FOR UPDATE';
 590                         }
 591                 }
 592
 593                 return $options;
 594         }
 595
 596         /**
 597          * @return int Page ID
 598          */
 599         public function getID() {
 600                 return $this->mTitle->getArticleID();
 601         }
 602
 603         /**
 604          * @return bool Whether or not the page exists in the database
 605          */
 606         public function exists() {
 607                 return $this->getId() > 0;
 608         }
 609
 610         /**
 611          * Check if this page is something we're going to be showing
 612          * some sort of sensible content for. If we return false, page
 613          * views (plain action=view) will return an HTTP 404 response,
 614          * so spiders and robots can know they're following a bad link.
 615          *
 616          * @return bool
 617          */
 618         public function hasViewableContent() {
 619                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 620         }
 621
 622         /**
 623          * @return int The view count for the page
 624          */
 625         public function getCount() {
 626                 if ( -1 == $this->mCounter ) {
 627                         $id = $this->getID();
 628
 629                         if ( $id == 0 ) {
 630                                 $this->mCounter = 0;
 631                         } else {
 632                                 $dbr = wfGetDB( DB_SLAVE );
 633                                 $this->mCounter = $dbr->selectField( 'page',
 634                                         'page_counter',
 635                                         array( 'page_id' => $id ),
 636                                         __METHOD__,
 637                                         $this->getSelectOptions()
 638                                 );
 639                         }
 640                 }
 641
 642                 return $this->mCounter;
 643         }
 644
 645         /**
 646          * Determine whether a page would be suitable for being counted as an
 647          * article in the site_stats table based on the title & its content
 648          *
 649          * @param $text String: text to analyze
 650          * @return bool
 651          */
 652         public function isCountable( $text ) {
 653                 global $wgUseCommaCount;
 654
 655                 $token = $wgUseCommaCount ? ',' : '[[';
 656
 657                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 658         }
 659
 660         /**
 661          * Tests if the article text represents a redirect
 662          *
 663          * @param $text mixed string containing article contents, or boolean
 664          * @return bool
 665          */
 666         public function isRedirect( $text = false ) {
 667                 if ( $text === false ) {
 668                         if ( $this->mDataLoaded ) {
 669                                 return $this->mIsRedirect;
 670                         }
 671
 672                         // Apparently loadPageData was never called
 673                         $this->loadContent();
 674                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 675                 } else {
 676                         $titleObj = Title::newFromRedirect( $text );
 677                 }
 678
 679                 return $titleObj !== null;
 680         }
 681
 682         /**
 683          * Returns true if the currently-referenced revision is the current edit
 684          * to this page (and it exists).
 685          * @return bool
 686          */
 687         public function isCurrent() {
 688                 # If no oldid, this is the current version.
 689                 if ( $this->getOldID() == 0 ) {
 690                         return true;
 691                 }
 692
 693                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 694         }
 695
 696         /**
 697          * Loads everything except the text
 698          * This isn't necessary for all uses, so it's only done if needed.
 699          */
 700         protected function loadLastEdit() {
 701                 if ( -1 != $this->mUser ) {
 702                         return;
 703                 }
 704
 705                 # New or non-existent articles have no user information
 706                 $id = $this->getID();
 707                 if ( 0 == $id ) {
 708                         return;
 709                 }
 710
 711                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 712                 if ( !is_null( $this->mLastRevision ) ) {
 713                         $this->mUser      = $this->mLastRevision->getUser();
 714                         $this->mUserText  = $this->mLastRevision->getUserText();
 715                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 716                         $this->mComment   = $this->mLastRevision->getComment();
 717                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 718                         $this->mRevIdFetched = $this->mLastRevision->getId();
 719                 }
 720         }
 721
 722         /**
 723          * @return string GMT timestamp of last article revision
 724          **/
 725
 726         public function getTimestamp() {
 727                 // Check if the field has been filled by ParserCache::get()
 728                 if ( !$this->mTimestamp ) {
 729                         $this->loadLastEdit();
 730                 }
 731
 732                 return wfTimestamp( TS_MW, $this->mTimestamp );
 733         }
 734
 735         /**
 736          * @return int user ID for the user that made the last article revision
 737          */
 738         public function getUser() {
 739                 $this->loadLastEdit();
 740                 return $this->mUser;
 741         }
 742
 743         /**
 744          * @return string username of the user that made the last article revision
 745          */
 746         public function getUserText() {
 747                 $this->loadLastEdit();
 748                 return $this->mUserText;
 749         }
 750
 751         /**
 752          * @return string Comment stored for the last article revision
 753          */
 754         public function getComment() {
 755                 $this->loadLastEdit();
 756                 return $this->mComment;
 757         }
 758
 759         /**
 760          * Returns true if last revision was marked as "minor edit"
 761          *
 762          * @return boolean Minor edit indicator for the last article revision.
 763          */
 764         public function getMinorEdit() {
 765                 $this->loadLastEdit();
 766                 return $this->mMinorEdit;
 767         }
 768
 769         /**
 770          * Use this to fetch the rev ID used on page views
 771          *
 772          * @return int revision ID of last article revision
 773          */
 774         public function getRevIdFetched() {
 775                 $this->loadLastEdit();
 776                 return $this->mRevIdFetched;
 777         }
 778
 779         /**
 780          * FIXME: this does what?
 781          * @param $limit Integer: default 0.
 782          * @param $offset Integer: default 0.
 783          * @return UserArrayFromResult object with User objects of article contributors for requested range
 784          */
 785         public function getContributors( $limit = 0, $offset = 0 ) {
 786                 # FIXME: this is expensive; cache this info somewhere.
 787
 788                 $dbr = wfGetDB( DB_SLAVE );
 789                 $revTable = $dbr->tableName( 'revision' );
 790                 $userTable = $dbr->tableName( 'user' );
 791
 792                 $pageId = $this->getId();
 793
 794                 $user = $this->getUser();
 795
 796                 if ( $user ) {
 797                         $excludeCond = "AND rev_user != $user";
 798                 } else {
 799                         $userText = $dbr->addQuotes( $this->getUserText() );
 800                         $excludeCond = "AND rev_user_text != $userText";
 801                 }
 802
 803                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 804
 805                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 806                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 807                         WHERE rev_page = $pageId
 808                         $excludeCond
 809                         AND $deletedBit = 0
 810                         GROUP BY rev_user, rev_user_text
 811                         ORDER BY timestamp DESC";
 812
 813                 if ( $limit > 0 ) {
 814                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 815                 }
 816
 817                 $sql .= ' ' . $this->getSelectOptions();
 818                 $res = $dbr->query( $sql, __METHOD__ );
 819
 820                 return new UserArrayFromResult( $res );
 821         }
 822
 823         /**
 824          * This is the default action of the index.php entry point: just view the
 825          * page of the given title.
 826          */
 827         public function view() {
 828                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 829                 global $wgUseFileCache, $wgUseETag;
 830
 831                 wfProfileIn( __METHOD__ );
 832
 833                 # Get variables from query string
 834                 $oldid = $this->getOldID();
 835                 $parserCache = ParserCache::singleton();
 836
 837                 $parserOptions = $this->getParserOptions();
 838                 # Render printable version, use printable version cache
 839                 if ( $wgOut->isPrintable() ) {
 840                         $parserOptions->setIsPrintable( true );
 841                         $parserOptions->setEditSection( false );
 842                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 843                         $parserOptions->setEditSection( false );
 844                 }
 845
 846                 # Try client and file cache
 847                 if ( $oldid === 0 && $this->checkTouched() ) {
 848                         if ( $wgUseETag ) {
 849                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 850                         }
 851
 852                         # Is is client cached?
 853                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 854                                 wfDebug( __METHOD__ . ": done 304\n" );
 855                                 wfProfileOut( __METHOD__ );
 856
 857                                 return;
 858                         # Try file cache
 859                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 860                                 wfDebug( __METHOD__ . ": done file cache\n" );
 861                                 # tell wgOut that output is taken care of
 862                                 $wgOut->disable();
 863                                 $this->viewUpdates();
 864                                 wfProfileOut( __METHOD__ );
 865
 866                                 return;
 867                         }
 868                 }
 869
 870                 # getOldID may want us to redirect somewhere else
 871                 if ( $this->mRedirectUrl ) {
 872                         $wgOut->redirect( $this->mRedirectUrl );
 873                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 874                         wfProfileOut( __METHOD__ );
 875
 876                         return;
 877                 }
 878
 879                 $wgOut->setArticleFlag( true );
 880                 # Set page title (may be overridden by DISPLAYTITLE)
 881                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 882
 883                 # If we got diff in the query, we want to see a diff page instead of the article.
 884                 if ( $wgRequest->getCheck( 'diff' ) ) {
 885                         wfDebug( __METHOD__ . ": showing diff page\n" );
 886                         $this->showDiffPage();
 887                         wfProfileOut( __METHOD__ );
 888
 889                         return;
 890                 }
 891
 892                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 893                         $parserOptions->setEditSection( false );
 894                 }
 895
 896                 # Should the parser cache be used?
 897                 $useParserCache = $this->useParserCache( $oldid );
 898                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 899                 if ( $wgUser->getStubThreshold() ) {
 900                         wfIncrStats( 'pcache_miss_stub' );
 901                 }
 902
 903                 $wasRedirected = $this->showRedirectedFromHeader();
 904                 $this->showNamespaceHeader();
 905
 906                 # Iterate through the possible ways of constructing the output text.
 907                 # Keep going until $outputDone is set, or we run out of things to do.
 908                 $pass = 0;
 909                 $outputDone = false;
 910                 $this->mParserOutput = false;
 911
 912                 while ( !$outputDone && ++$pass ) {
 913                         switch( $pass ) {
 914                                 case 1:
 915                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 916                                         break;
 917                                 case 2:
 918                                         # Try the parser cache
 919                                         if ( $useParserCache ) {
 920                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 921
 922                                                 if ( $this->mParserOutput !== false ) {
 923                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 924                                                         $wgOut->addParserOutput( $this->mParserOutput );
 925                                                         # Ensure that UI elements requiring revision ID have
 926                                                         # the correct version information.
 927                                                         $wgOut->setRevisionId( $this->mLatest );
 928                                                         $outputDone = true;
 929                                                 }
 930                                         }
 931                                         break;
 932                                 case 3:
 933                                         $text = $this->getContent();
 934                                         if ( $text === false || $this->getID() == 0 ) {
 935                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 936                                                 $this->showMissingArticle();
 937                                                 wfProfileOut( __METHOD__ );
 938                                                 return;
 939                                         }
 940
 941                                         # Another whitelist check in case oldid is altering the title
 942                                         if ( !$this->mTitle->userCanRead() ) {
 943                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 944                                                 $wgOut->loginToUse();
 945                                                 $wgOut->output();
 946                                                 $wgOut->disable();
 947                                                 wfProfileOut( __METHOD__ );
 948                                                 return;
 949                                         }
 950
 951                                         # Are we looking at an old revision
 952                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 953                                                 $this->setOldSubtitle( $oldid );
 954
 955                                                 if ( !$this->showDeletedRevisionHeader() ) {
 956                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 957                                                         wfProfileOut( __METHOD__ );
 958                                                         return;
 959                                                 }
 960
 961                                                 # If this "old" version is the current, then try the parser cache...
 962                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 963                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 964                                                         if ( $this->mParserOutput ) {
 965                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 966                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 967                                                                 $wgOut->setRevisionId( $this->mLatest );
 968                                                                 $outputDone = true;
 969                                                                 break;
 970                                                         }
 971                                                 }
 972                                         }
 973
 974                                         # Ensure that UI elements requiring revision ID have
 975                                         # the correct version information.
 976                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 977
 978                                         # Pages containing custom CSS or JavaScript get special treatment
 979                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 980                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 981                                                 $this->showCssOrJsPage();
 982                                                 $outputDone = true;
 983                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 984                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 985                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 986                                                 # Don't append the subtitle if this was an old revision
 987                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 988                                                 # Parse just to get categories, displaytitle, etc.
 989                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 990                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 991                                                 $outputDone = true;
 992                                         }
 993                                         break;
 994                                 case 4:
 995                                         # Run the parse, protected by a pool counter
 996                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 997
 998                                         $this->checkTouched();
 999                                         $key = $parserCache->getKey( $this, $parserOptions );
1000                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1001
1002                                         if ( !$poolArticleView->execute() ) {
1003                                                 # Connection or timeout error
1004                                                 wfProfileOut( __METHOD__ );
1005                                                 return;
1006                                         } else {
1007                                                 $outputDone = true;
1008                                         }
1009                                         break;
1010                                 # Should be unreachable, but just in case...
1011                                 default:
1012                                         break 2;
1013                         }
1014                 }
1015
1016                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1017                 if ( $this->mParserOutput ) {
1018                         $titleText = $this->mParserOutput->getTitleText();
1019
1020                         if ( strval( $titleText ) !== '' ) {
1021                                 $wgOut->setPageTitle( $titleText );
1022                         }
1023                 }
1024
1025                 # For the main page, overwrite the <title> element with the con-
1026                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1027                 # that's not empty).
1028                 # This message always exists because it is in the i18n files
1029                 if ( $this->mTitle->equals( Title::newMainPage() )
1030                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1031                 {
1032                         $wgOut->setHTMLTitle( $m );
1033                 }
1034
1035                 # Now that we've filled $this->mParserOutput, we know whether
1036                 # there are any __NOINDEX__ tags on the page
1037                 $policy = $this->getRobotPolicy( 'view' );
1038                 $wgOut->setIndexPolicy( $policy['index'] );
1039                 $wgOut->setFollowPolicy( $policy['follow'] );
1040
1041                 $this->showViewFooter();
1042                 $this->viewUpdates();
1043                 wfProfileOut( __METHOD__ );
1044         }
1045
1046         /**
1047          * Show a diff page according to current request variables. For use within
1048          * Article::view() only, other callers should use the DifferenceEngine class.
1049          */
1050         public function showDiffPage() {
1051                 global $wgRequest, $wgUser;
1052
1053                 $diff = $wgRequest->getVal( 'diff' );
1054                 $rcid = $wgRequest->getVal( 'rcid' );
1055                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1056                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1057                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1058                 $oldid = $this->getOldID();
1059
1060                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1061                 // DifferenceEngine directly fetched the revision:
1062                 $this->mRevIdFetched = $de->mNewid;
1063                 $de->showDiffPage( $diffOnly );
1064
1065                 // Needed to get the page's current revision
1066                 $this->loadPageData();
1067                 if ( $diff == 0 || $diff == $this->mLatest ) {
1068                         # Run view updates for current revision only
1069                         $this->viewUpdates();
1070                 }
1071         }
1072
1073         /**
1074          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1075          * Article::view() only.
1076          *
1077          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1078          * page views.
1079          */
1080         protected function showCssOrJsPage() {
1081                 global $wgOut;
1082
1083                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1084
1085                 // Give hooks a chance to customise the output
1086                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1087                         // Wrap the whole lot in a <pre> and don't parse
1088                         $m = array();
1089                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1090                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1091                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1092                         $wgOut->addHTML( "\n</pre>\n" );
1093                 }
1094         }
1095
1096         /**
1097          * Get the robot policy to be used for the current view
1098          * @param $action String the action= GET parameter
1099          * @return Array the policy that should be set
1100          * TODO: actions other than 'view'
1101          */
1102         public function getRobotPolicy( $action ) {
1103                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1104                 global $wgDefaultRobotPolicy, $wgRequest;
1105
1106                 $ns = $this->mTitle->getNamespace();
1107
1108                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1109                         # Don't index user and user talk pages for blocked users (bug 11443)
1110                         if ( !$this->mTitle->isSubpage() ) {
1111                                 $block = new Block();
1112                                 if ( $block->load( $this->mTitle->getText() ) ) {
1113                                         return array(
1114                                                 'index'  => 'noindex',
1115                                                 'follow' => 'nofollow'
1116                                         );
1117                                 }
1118                         }
1119                 }
1120
1121                 if ( $this->getID() === 0 || $this->getOldID() ) {
1122                         # Non-articles (special pages etc), and old revisions
1123                         return array(
1124                                 'index'  => 'noindex',
1125                                 'follow' => 'nofollow'
1126                         );
1127                 } elseif ( $wgOut->isPrintable() ) {
1128                         # Discourage indexing of printable versions, but encourage following
1129                         return array(
1130                                 'index'  => 'noindex',
1131                                 'follow' => 'follow'
1132                         );
1133                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1134                         # For ?curid=x urls, disallow indexing
1135                         return array(
1136                                 'index'  => 'noindex',
1137                                 'follow' => 'follow'
1138                         );
1139                 }
1140
1141                 # Otherwise, construct the policy based on the various config variables.
1142                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1143
1144                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1145                         # Honour customised robot policies for this namespace
1146                         $policy = array_merge(
1147                                 $policy,
1148                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1149                         );
1150                 }
1151                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1152                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1153                         # a final sanity check that we have really got the parser output.
1154                         $policy = array_merge(
1155                                 $policy,
1156                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1157                         );
1158                 }
1159
1160                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1161                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1162                         $policy = array_merge(
1163                                 $policy,
1164                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1165                         );
1166                 }
1167
1168                 return $policy;
1169         }
1170
1171         /**
1172          * Converts a String robot policy into an associative array, to allow
1173          * merging of several policies using array_merge().
1174          * @param $policy Mixed, returns empty array on null/false/'', transparent
1175          *            to already-converted arrays, converts String.
1176          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1177          */
1178         public static function formatRobotPolicy( $policy ) {
1179                 if ( is_array( $policy ) ) {
1180                         return $policy;
1181                 } elseif ( !$policy ) {
1182                         return array();
1183                 }
1184
1185                 $policy = explode( ',', $policy );
1186                 $policy = array_map( 'trim', $policy );
1187
1188                 $arr = array();
1189                 foreach ( $policy as $var ) {
1190                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1191                                 $arr['index'] = $var;
1192                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1193                                 $arr['follow'] = $var;
1194                         }
1195                 }
1196
1197                 return $arr;
1198         }
1199
1200         /**
1201          * If this request is a redirect view, send "redirected from" subtitle to
1202          * $wgOut. Returns true if the header was needed, false if this is not a
1203          * redirect view. Handles both local and remote redirects.
1204          *
1205          * @return boolean
1206          */
1207         public function showRedirectedFromHeader() {
1208                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1209
1210                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1211                 $sk = $wgUser->getSkin();
1212
1213                 if ( isset( $this->mRedirectedFrom ) ) {
1214                         // This is an internally redirected page view.
1215                         // We'll need a backlink to the source page for navigation.
1216                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1217                                 $redir = $sk->link(
1218                                         $this->mRedirectedFrom,
1219                                         null,
1220                                         array(),
1221                                         array( 'redirect' => 'no' ),
1222                                         array( 'known', 'noclasses' )
1223                                 );
1224
1225                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1226                                 $wgOut->setSubtitle( $s );
1227
1228                                 // Set the fragment if one was specified in the redirect
1229                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1230                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1231                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1232                                 }
1233
1234                                 // Add a <link rel="canonical"> tag
1235                                 $wgOut->addLink( array( 'rel' => 'canonical',
1236                                         'href' => $this->mTitle->getLocalURL() )
1237                                 );
1238
1239                                 return true;
1240                         }
1241                 } elseif ( $rdfrom ) {
1242                         // This is an externally redirected view, from some other wiki.
1243                         // If it was reported from a trusted site, supply a backlink.
1244                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1245                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1246                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1247                                 $wgOut->setSubtitle( $s );
1248
1249                                 return true;
1250                         }
1251                 }
1252
1253                 return false;
1254         }
1255
1256         /**
1257          * Show a header specific to the namespace currently being viewed, like
1258          * [[MediaWiki:Talkpagetext]]. For Article::view().
1259          */
1260         public function showNamespaceHeader() {
1261                 global $wgOut;
1262
1263                 if ( $this->mTitle->isTalkPage() ) {
1264                         $msg = wfMsgNoTrans( 'talkpageheader' );
1265                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1266                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1267                         }
1268                 }
1269         }
1270
1271         /**
1272          * Show the footer section of an ordinary page view
1273          */
1274         public function showViewFooter() {
1275                 global $wgOut, $wgUseTrackbacks;
1276
1277                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1278                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1279                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1280                 }
1281
1282                 # If we have been passed an &rcid= parameter, we want to give the user a
1283                 # chance to mark this new article as patrolled.
1284                 $this->showPatrolFooter();
1285
1286                 # Trackbacks
1287                 if ( $wgUseTrackbacks ) {
1288                         $this->addTrackbacks();
1289                 }
1290         }
1291
1292         /**
1293          * If patrol is possible, output a patrol UI box. This is called from the
1294          * footer section of ordinary page views. If patrol is not possible or not
1295          * desired, does nothing.
1296          */
1297         public function showPatrolFooter() {
1298                 global $wgOut, $wgRequest, $wgUser;
1299
1300                 $rcid = $wgRequest->getVal( 'rcid' );
1301
1302                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1303                         return;
1304                 }
1305
1306                 $sk = $wgUser->getSkin();
1307                 $token = $wgUser->editToken();
1308
1309                 $wgOut->addHTML(
1310                         "<div class='patrollink'>" .
1311                                 wfMsgHtml(
1312                                         'markaspatrolledlink',
1313                                         $sk->link(
1314                                                 $this->mTitle,
1315                                                 wfMsgHtml( 'markaspatrolledtext' ),
1316                                                 array(),
1317                                                 array(
1318                                                         'action' => 'markpatrolled',
1319                                                         'rcid' => $rcid,
1320                                                         'token' => $token,
1321                                                 ),
1322                                                 array( 'known', 'noclasses' )
1323                                         )
1324                                 ) .
1325                         '</div>'
1326                 );
1327         }
1328
1329         /**
1330          * Show the error text for a missing article. For articles in the MediaWiki
1331          * namespace, show the default message text. To be called from Article::view().
1332          */
1333         public function showMissingArticle() {
1334                 global $wgOut, $wgRequest, $wgUser;
1335
1336                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1337                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1338                         $parts = explode( '/', $this->mTitle->getText() );
1339                         $rootPart = $parts[0];
1340                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1341                         $ip = User::isIP( $rootPart );
1342
1343                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1344                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1345                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1346                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1347                                 LogEventsList::showLogExtract(
1348                                         $wgOut,
1349                                         'block',
1350                                         $user->getUserPage()->getPrefixedText(),
1351                                         '',
1352                                         array(
1353                                                 'lim' => 1,
1354                                                 'showIfEmpty' => false,
1355                                                 'msgKey' => array(
1356                                                         'blocked-notice-logextract',
1357                                                         $user->getName() # Support GENDER in notice
1358                                                 )
1359                                         )
1360                                 );
1361                         }
1362                 }
1363
1364                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1365
1366                 # Show delete and move logs
1367                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1368                         array(  'lim' => 10,
1369                                 'conds' => array( "log_action != 'revision'" ),
1370                                 'showIfEmpty' => false,
1371                                 'msgKey' => array( 'moveddeleted-notice' ) )
1372                 );
1373
1374                 # Show error message
1375                 $oldid = $this->getOldID();
1376                 if ( $oldid ) {
1377                         $text = wfMsgNoTrans( 'missing-article',
1378                                 $this->mTitle->getPrefixedText(),
1379                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1380                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1381                         // Use the default message text
1382                         $text = $this->getContent();
1383                 } else {
1384                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1385                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1386                         $errors = array_merge( $createErrors, $editErrors );
1387
1388                         if ( !count( $errors ) ) {
1389                                 $text = wfMsgNoTrans( 'noarticletext' );
1390                         } else {
1391                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1392                         }
1393                 }
1394                 $text = "<div class='noarticletext'>\n$text\n</div>";
1395
1396                 if ( !$this->hasViewableContent() ) {
1397                         // If there's no backing content, send a 404 Not Found
1398                         // for better machine handling of broken links.
1399                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1400                 }
1401
1402                 $wgOut->addWikiText( $text );
1403         }
1404
1405         /**
1406          * If the revision requested for view is deleted, check permissions.
1407          * Send either an error message or a warning header to $wgOut.
1408          *
1409          * @return boolean true if the view is allowed, false if not.
1410          */
1411         public function showDeletedRevisionHeader() {
1412                 global $wgOut, $wgRequest;
1413
1414                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1415                         // Not deleted
1416                         return true;
1417                 }
1418
1419                 // If the user is not allowed to see it...
1420                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1421                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1422                                 'rev-deleted-text-permission' );
1423
1424                         return false;
1425                 // If the user needs to confirm that they want to see it...
1426                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1427                         # Give explanation and add a link to view the revision...
1428                         $oldid = intval( $this->getOldID() );
1429                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1430                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1431                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1432                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1433                                 array( $msg, $link ) );
1434
1435                         return false;
1436                 // We are allowed to see...
1437                 } else {
1438                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1439                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1440                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1441
1442                         return true;
1443                 }
1444         }
1445
1446         /**
1447          * Should the parser cache be used?
1448          *
1449          * @return boolean
1450          */
1451         public function useParserCache( $oldid ) {
1452                 global $wgUser, $wgEnableParserCache;
1453
1454                 return $wgEnableParserCache
1455                         && $wgUser->getStubThreshold() == 0
1456                         && $this->exists()
1457                         && empty( $oldid )
1458                         && !$this->mTitle->isCssOrJsPage()
1459                         && !$this->mTitle->isCssJsSubpage();
1460         }
1461
1462         /**
1463          * Execute the uncached parse for action=view
1464          */
1465         public function doViewParse() {
1466                 global $wgOut;
1467
1468                 $oldid = $this->getOldID();
1469                 $useParserCache = $this->useParserCache( $oldid );
1470                 $parserOptions = $this->getParserOptions();
1471
1472                 # Render printable version, use printable version cache
1473                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1474
1475                 # Don't show section-edit links on old revisions... this way lies madness.
1476                 if ( !$this->isCurrent() || $wgOut->isPrintable() ) {
1477                         $parserOptions->setEditSection( false );
1478                 }
1479
1480                 $useParserCache = $this->useParserCache( $oldid );
1481                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1482
1483                 return true;
1484         }
1485
1486         /**
1487          * Try to fetch an expired entry from the parser cache. If it is present,
1488          * output it and return true. If it is not present, output nothing and
1489          * return false. This is used as a callback function for
1490          * PoolCounter::executeProtected().
1491          *
1492          * @return boolean
1493          */
1494         public function tryDirtyCache() {
1495                 global $wgOut;
1496                 $parserCache = ParserCache::singleton();
1497                 $options = clone $this->getParserOptions();
1498
1499                 if ( $wgOut->isPrintable() ) {
1500                         $options->setIsPrintable( true );
1501                         $options->setEditSection( false );
1502                 }
1503
1504                 $output = $parserCache->getDirty( $this, $options );
1505
1506                 if ( $output ) {
1507                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1508                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1509                         $wgOut->setSquidMaxage( 0 );
1510                         $this->mParserOutput = $output;
1511                         $wgOut->addParserOutput( $output );
1512                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1513
1514                         return true;
1515                 } else {
1516                         wfDebugLog( 'dirty', "dirty missing\n" );
1517                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1518
1519                         return false;
1520                 }
1521         }
1522
1523         /**
1524          * View redirect
1525          *
1526          * @param $target Title object or Array of destination(s) to redirect
1527          * @param $appendSubtitle Boolean [optional]
1528          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1529          * @return string containing HMTL with redirect link
1530          */
1531         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1532                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1533
1534                 if ( !is_array( $target ) ) {
1535                         $target = array( $target );
1536                 }
1537
1538                 $imageDir = $wgContLang->getDir();
1539
1540                 if ( $appendSubtitle ) {
1541                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1542                 }
1543
1544                 $sk = $wgUser->getSkin();
1545                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1546                 $title = array_shift( $target );
1547
1548                 if ( $forceKnown ) {
1549                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1550                 } else {
1551                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1552                 }
1553
1554                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1555                 $alt = $wgContLang->isRTL() ? '←' : '→';
1556                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1557                 // FIXME: where this happens?
1558                 foreach ( $target as $rt ) {
1559                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1560                         if ( $forceKnown ) {
1561                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText() ) );
1562                         } else {
1563                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1564                         }
1565                 }
1566
1567                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1568                 return Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1569                         '<span class="redirectText">' . $link . '</span>';
1570         }
1571
1572         /**
1573          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1574          */
1575         public function addTrackbacks() {
1576                 global $wgOut, $wgUser;
1577
1578                 $dbr = wfGetDB( DB_SLAVE );
1579                 $tbs = $dbr->select( 'trackbacks',
1580                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1581                         array( 'tb_page' => $this->getID() )
1582                 );
1583
1584                 if ( !$dbr->numRows( $tbs ) ) {
1585                         return;
1586                 }
1587
1588                 $tbtext = "";
1589                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1590                         $rmvtxt = "";
1591
1592                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1593                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1594                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1595                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1596                         }
1597
1598                         $tbtext .= "\n";
1599                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1600                                         $o->tb_title,
1601                                         $o->tb_url,
1602                                         $o->tb_ex,
1603                                         $o->tb_name,
1604                                         $rmvtxt );
1605                 }
1606
1607                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1608         }
1609
1610         /**
1611          * Removes trackback record for current article from trackbacks table
1612          */
1613         public function deletetrackback() {
1614                 global $wgUser, $wgRequest, $wgOut;
1615
1616                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1617                         $wgOut->addWikiMsg( 'sessionfailure' );
1618
1619                         return;
1620                 }
1621
1622                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1623
1624                 if ( count( $permission_errors ) ) {
1625                         $wgOut->showPermissionsErrorPage( $permission_errors );
1626
1627                         return;
1628                 }
1629
1630                 $db = wfGetDB( DB_MASTER );
1631                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1632
1633                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1634                 $this->mTitle->invalidateCache();
1635         }
1636
1637         /**
1638          * Handle action=render
1639          */
1640
1641         public function render() {
1642                 global $wgOut;
1643
1644                 $wgOut->setArticleBodyOnly( true );
1645                 $this->view();
1646         }
1647
1648         /**
1649          * Handle action=purge
1650          */
1651         public function purge() {
1652                 global $wgUser, $wgRequest, $wgOut;
1653
1654                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1655                         //FIXME: shouldn't this be in doPurge()?
1656                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1657                                 $this->doPurge();
1658                                 $this->view();
1659                         }
1660                 } else {
1661                         $formParams = array(
1662                                 'method' => 'post',
1663                                 'action' =>  $wgRequest->getRequestURL(),
1664                         );
1665
1666                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1667
1668                         $form  = Html::openElement( 'form', $formParams );
1669                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1670                         $form .= Html::closeElement( 'form' );
1671
1672                         $wgOut->addHTML( $form );
1673                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1674
1675                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1676                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1677                 }
1678         }
1679
1680         /**
1681          * Perform the actions of a page purging
1682          */
1683         public function doPurge() {
1684                 global $wgUseSquid;
1685
1686                 // Invalidate the cache
1687                 $this->mTitle->invalidateCache();
1688
1689                 if ( $wgUseSquid ) {
1690                         // Commit the transaction before the purge is sent
1691                         $dbw = wfGetDB( DB_MASTER );
1692                         $dbw->commit();
1693
1694                         // Send purge
1695                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1696                         $update->doUpdate();
1697                 }
1698
1699                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1700                         global $wgMessageCache;
1701
1702                         if ( $this->getID() == 0 ) {
1703                                 $text = false;
1704                         } else {
1705                                 $text = $this->getRawText();
1706                         }
1707
1708                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1709                 }
1710         }
1711
1712         /**
1713          * Insert a new empty page record for this article.
1714          * This *must* be followed up by creating a revision
1715          * and running $this->updateRevisionOn( ... );
1716          * or else the record will be left in a funky state.
1717          * Best if all done inside a transaction.
1718          *
1719          * @param $dbw Database
1720          * @return int The newly created page_id key, or false if the title already existed
1721          * @private
1722          */
1723         public function insertOn( $dbw ) {
1724                 wfProfileIn( __METHOD__ );
1725
1726                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1727                 $dbw->insert( 'page', array(
1728                         'page_id'           => $page_id,
1729                         'page_namespace'    => $this->mTitle->getNamespace(),
1730                         'page_title'        => $this->mTitle->getDBkey(),
1731                         'page_counter'      => 0,
1732                         'page_restrictions' => '',
1733                         'page_is_redirect'  => 0, # Will set this shortly...
1734                         'page_is_new'       => 1,
1735                         'page_random'       => wfRandom(),
1736                         'page_touched'      => $dbw->timestamp(),
1737                         'page_latest'       => 0, # Fill this in shortly...
1738                         'page_len'          => 0, # Fill this in shortly...
1739                 ), __METHOD__, 'IGNORE' );
1740
1741                 $affected = $dbw->affectedRows();
1742
1743                 if ( $affected ) {
1744                         $newid = $dbw->insertId();
1745                         $this->mTitle->resetArticleId( $newid );
1746                 }
1747                 wfProfileOut( __METHOD__ );
1748
1749                 return $affected ? $newid : false;
1750         }
1751
1752         /**
1753          * Update the page record to point to a newly saved revision.
1754          *
1755          * @param $dbw Database object
1756          * @param $revision Revision: For ID number, and text used to set
1757                             length and redirect status fields
1758          * @param $lastRevision Integer: if given, will not overwrite the page field
1759          *                      when different from the currently set value.
1760          *                      Giving 0 indicates the new page flag should be set
1761          *                      on.
1762          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1763          *                           removing rows in redirect table.
1764          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1765          *                    Needed when $lastRevision has to be set to sth. !=0
1766          * @return bool true on success, false on failure
1767          * @private
1768          */
1769         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1770                 wfProfileIn( __METHOD__ );
1771
1772                 $text = $revision->getText();
1773                 $rt = Title::newFromRedirectRecurse( $text );
1774
1775                 $conditions = array( 'page_id' => $this->getId() );
1776
1777                 if ( !is_null( $lastRevision ) ) {
1778                         # An extra check against threads stepping on each other
1779                         $conditions['page_latest'] = $lastRevision;
1780                 }
1781
1782                 if ( !$setNewFlag ) {
1783                         $setNewFlag = ( $lastRevision === 0 );
1784                 }
1785
1786                 $dbw->update( 'page',
1787                         array( /* SET */
1788                                 'page_latest'      => $revision->getId(),
1789                                 'page_touched'     => $dbw->timestamp(),
1790                                 'page_is_new'      => $setNewFlag,
1791                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1792                                 'page_len'         => strlen( $text ),
1793                         ),
1794                         $conditions,
1795                         __METHOD__ );
1796
1797                 $result = $dbw->affectedRows() != 0;
1798                 if ( $result ) {
1799                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1800                 }
1801
1802                 wfProfileOut( __METHOD__ );
1803                 return $result;
1804         }
1805
1806         /**
1807          * Add row to the redirect table if this is a redirect, remove otherwise.
1808          *
1809          * @param $dbw Database
1810          * @param $redirectTitle a title object pointing to the redirect target,
1811          *                       or NULL if this is not a redirect
1812          * @param $lastRevIsRedirect If given, will optimize adding and
1813          *                           removing rows in redirect table.
1814          * @return bool true on success, false on failure
1815          * @private
1816          */
1817         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1818                 // Always update redirects (target link might have changed)
1819                 // Update/Insert if we don't know if the last revision was a redirect or not
1820                 // Delete if changing from redirect to non-redirect
1821                 $isRedirect = !is_null( $redirectTitle );
1822
1823                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1824                         wfProfileIn( __METHOD__ );
1825                         if ( $isRedirect ) {
1826                                 $this->insertRedirectEntry( $redirectTitle );
1827                         } else {
1828                                 // This is not a redirect, remove row from redirect table
1829                                 $where = array( 'rd_from' => $this->getId() );
1830                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1831                         }
1832
1833                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1834                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1835                         }
1836                         wfProfileOut( __METHOD__ );
1837
1838                         return ( $dbw->affectedRows() != 0 );
1839                 }
1840
1841                 return true;
1842         }
1843
1844         /**
1845          * If the given revision is newer than the currently set page_latest,
1846          * update the page record. Otherwise, do nothing.
1847          *
1848          * @param $dbw Database object
1849          * @param $revision Revision object
1850          * @return mixed
1851          */
1852         public function updateIfNewerOn( &$dbw, $revision ) {
1853                 wfProfileIn( __METHOD__ );
1854
1855                 $row = $dbw->selectRow(
1856                         array( 'revision', 'page' ),
1857                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1858                         array(
1859                                 'page_id' => $this->getId(),
1860                                 'page_latest=rev_id' ),
1861                         __METHOD__ );
1862
1863                 if ( $row ) {
1864                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1865                                 wfProfileOut( __METHOD__ );
1866                                 return false;
1867                         }
1868                         $prev = $row->rev_id;
1869                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1870                 } else {
1871                         # No or missing previous revision; mark the page as new
1872                         $prev = 0;
1873                         $lastRevIsRedirect = null;
1874                 }
1875
1876                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1877
1878                 wfProfileOut( __METHOD__ );
1879                 return $ret;
1880         }
1881
1882         /**
1883          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1884          * @param $text String: new text of the section
1885          * @param $summary String: new section's subject, only if $section is 'new'
1886          * @param $edittime String: revision timestamp or null to use the current revision
1887          * @return string Complete article text, or null if error
1888          */
1889         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1890                 wfProfileIn( __METHOD__ );
1891
1892                 if ( strval( $section ) == '' ) {
1893                         // Whole-page edit; let the whole text through
1894                 } else {
1895                         if ( is_null( $edittime ) ) {
1896                                 $rev = Revision::newFromTitle( $this->mTitle );
1897                         } else {
1898                                 $dbw = wfGetDB( DB_MASTER );
1899                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1900                         }
1901
1902                         if ( !$rev ) {
1903                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1904                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1905                                 return null;
1906                         }
1907
1908                         $oldtext = $rev->getText();
1909
1910                         if ( $section == 'new' ) {
1911                                 # Inserting a new section
1912                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1913                                 $text = strlen( trim( $oldtext ) ) > 0
1914                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1915                                                 : "{$subject}{$text}";
1916                         } else {
1917                                 # Replacing an existing section; roll out the big guns
1918                                 global $wgParser;
1919
1920                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1921                         }
1922                 }
1923
1924                 wfProfileOut( __METHOD__ );
1925                 return $text;
1926         }
1927
1928         /**
1929          * This function is not deprecated until somebody fixes the core not to use
1930          * it. Nevertheless, use Article::doEdit() instead.
1931          */
1932         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1933                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1934                         ( $isminor ? EDIT_MINOR : 0 ) |
1935                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1936                         ( $bot ? EDIT_FORCE_BOT : 0 );
1937
1938                 # If this is a comment, add the summary as headline
1939                 if ( $comment && $summary != "" ) {
1940                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
1941                 }
1942                 $this->doEdit( $text, $summary, $flags );
1943
1944                 $dbw = wfGetDB( DB_MASTER );
1945                 if ( $watchthis ) {
1946                         if ( !$this->mTitle->userIsWatching() ) {
1947                                 $dbw->begin();
1948                                 $this->doWatch();
1949                                 $dbw->commit();
1950                         }
1951                 } else {
1952                         if ( $this->mTitle->userIsWatching() ) {
1953                                 $dbw->begin();
1954                                 $this->doUnwatch();
1955                                 $dbw->commit();
1956                         }
1957                 }
1958                 $this->doRedirect( $this->isRedirect( $text ) );
1959         }
1960
1961         /**
1962          * @deprecated use Article::doEdit()
1963          */
1964         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1965                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1966                         ( $minor ? EDIT_MINOR : 0 ) |
1967                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1968
1969                 $status = $this->doEdit( $text, $summary, $flags );
1970
1971                 if ( !$status->isOK() ) {
1972                         return false;
1973                 }
1974
1975                 $dbw = wfGetDB( DB_MASTER );
1976                 if ( $watchthis ) {
1977                         if ( !$this->mTitle->userIsWatching() ) {
1978                                 $dbw->begin();
1979                                 $this->doWatch();
1980                                 $dbw->commit();
1981                         }
1982                 } else {
1983                         if ( $this->mTitle->userIsWatching() ) {
1984                                 $dbw->begin();
1985                                 $this->doUnwatch();
1986                                 $dbw->commit();
1987                         }
1988                 }
1989
1990                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1991                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1992
1993                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1994                 return true;
1995         }
1996
1997         /**
1998          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1999          * @param $flags Int
2000          * @return Int updated $flags
2001          */
2002         function checkFlags( $flags ) {
2003                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
2004                         if ( $this->mTitle->getArticleID() ) {
2005                                 $flags |= EDIT_UPDATE;
2006                         } else {
2007                                 $flags |= EDIT_NEW;
2008                         }
2009                 }
2010
2011                 return $flags;
2012         }
2013
2014         /**
2015          * Article::doEdit()
2016          *
2017          * Change an existing article or create a new article. Updates RC and all necessary caches,
2018          * optionally via the deferred update array.
2019          *
2020          * $wgUser must be set before calling this function.
2021          *
2022          * @param $text String: new text
2023          * @param $summary String: edit summary
2024          * @param $flags Integer bitfield:
2025          *      EDIT_NEW
2026          *          Article is known or assumed to be non-existent, create a new one
2027          *      EDIT_UPDATE
2028          *          Article is known or assumed to be pre-existing, update it
2029          *      EDIT_MINOR
2030          *          Mark this edit minor, if the user is allowed to do so
2031          *      EDIT_SUPPRESS_RC
2032          *          Do not log the change in recentchanges
2033          *      EDIT_FORCE_BOT
2034          *          Mark the edit a "bot" edit regardless of user rights
2035          *      EDIT_DEFER_UPDATES
2036          *          Defer some of the updates until the end of index.php
2037          *      EDIT_AUTOSUMMARY
2038          *          Fill in blank summaries with generated text where possible
2039          *
2040          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2041          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2042          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2043          * edit-already-exists error will be returned. These two conditions are also possible with
2044          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2045          *
2046          * @param $baseRevId the revision ID this edit was based off, if any
2047          * @param $user Optional user object, $wgUser will be used if not passed
2048          *
2049          * @return Status object. Possible errors:
2050          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2051          *     edit-gone-missing:       In update mode, but the article didn't exist
2052          *     edit-conflict:           In update mode, the article changed unexpectedly
2053          *     edit-no-change:          Warning that the text was the same as before
2054          *     edit-already-exists:     In creation mode, but the article already exists
2055          *
2056          *  Extensions may define additional errors.
2057          *
2058          *  $return->value will contain an associative array with members as follows:
2059          *     new:                     Boolean indicating if the function attempted to create a new article
2060          *     revision:                The revision object for the inserted revision, or null
2061          *
2062          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2063          */
2064         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2065                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2066
2067                 # Low-level sanity check
2068                 if ( $this->mTitle->getText() === '' ) {
2069                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2070                 }
2071
2072                 wfProfileIn( __METHOD__ );
2073
2074                 $user = is_null( $user ) ? $wgUser : $user;
2075                 $status = Status::newGood( array() );
2076
2077                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2078                 $this->loadPageData();
2079
2080                 $flags = $this->checkFlags( $flags );
2081
2082                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2083                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2084                 {
2085                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2086                         wfProfileOut( __METHOD__ );
2087
2088                         if ( $status->isOK() ) {
2089                                 $status->fatal( 'edit-hook-aborted' );
2090                         }
2091
2092                         return $status;
2093                 }
2094
2095                 # Silently ignore EDIT_MINOR if not allowed
2096                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2097                 $bot = $flags & EDIT_FORCE_BOT;
2098
2099                 $oldtext = $this->getRawText(); // current revision
2100                 $oldsize = strlen( $oldtext );
2101
2102                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2103                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2104                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2105                 }
2106
2107                 $editInfo = $this->prepareTextForEdit( $text );
2108                 $text = $editInfo->pst;
2109                 $newsize = strlen( $text );
2110
2111                 $dbw = wfGetDB( DB_MASTER );
2112                 $now = wfTimestampNow();
2113                 $this->mTimestamp = $now;
2114
2115                 if ( $flags & EDIT_UPDATE ) {
2116                         # Update article, but only if changed.
2117                         $status->value['new'] = false;
2118
2119                         # Make sure the revision is either completely inserted or not inserted at all
2120                         if ( !$wgDBtransactions ) {
2121                                 $userAbort = ignore_user_abort( true );
2122                         }
2123
2124                         $revisionId = 0;
2125
2126                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2127
2128                         if ( $changed ) {
2129                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2130                                   - (int)$this->isCountable( $oldtext );
2131                                 $this->mTotalAdjustment = 0;
2132
2133                                 if ( !$this->mLatest ) {
2134                                         # Article gone missing
2135                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2136                                         $status->fatal( 'edit-gone-missing' );
2137
2138                                         wfProfileOut( __METHOD__ );
2139                                         return $status;
2140                                 }
2141
2142                                 $revision = new Revision( array(
2143                                         'page'       => $this->getId(),
2144                                         'comment'    => $summary,
2145                                         'minor_edit' => $isminor,
2146                                         'text'       => $text,
2147                                         'parent_id'  => $this->mLatest,
2148                                         'user'       => $user->getId(),
2149                                         'user_text'  => $user->getName(),
2150                                 ) );
2151
2152                                 $dbw->begin();
2153                                 $revisionId = $revision->insertOn( $dbw );
2154
2155                                 # Update page
2156                                 #
2157                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2158                                 # during the course of this function. This makes sure that EditPage can detect
2159                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2160                                 # before this function is called. A previous function used a separate query, this
2161                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2162                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2163
2164                                 if ( !$ok ) {
2165                                         /* Belated edit conflict! Run away!! */
2166                                         $status->fatal( 'edit-conflict' );
2167
2168                                         # Delete the invalid revision if the DB is not transactional
2169                                         if ( !$wgDBtransactions ) {
2170                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2171                                         }
2172
2173                                         $revisionId = 0;
2174                                         $dbw->rollback();
2175                                 } else {
2176                                         global $wgUseRCPatrol;
2177                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2178                                         # Update recentchanges
2179                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2180                                                 # Mark as patrolled if the user can do so
2181                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2182                                                 # Add RC row to the DB
2183                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2184                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2185                                                         $revisionId, $patrolled
2186                                                 );
2187
2188                                                 # Log auto-patrolled edits
2189                                                 if ( $patrolled ) {
2190                                                         PatrolLog::record( $rc, true );
2191                                                 }
2192                                         }
2193                                         $user->incEditCount();
2194                                         $dbw->commit();
2195                                 }
2196                         } else {
2197                                 $status->warning( 'edit-no-change' );
2198                                 $revision = null;
2199                                 // Keep the same revision ID, but do some updates on it
2200                                 $revisionId = $this->getRevIdFetched();
2201                                 // Update page_touched, this is usually implicit in the page update
2202                                 // Other cache updates are done in onArticleEdit()
2203                                 $this->mTitle->invalidateCache();
2204                         }
2205
2206                         if ( !$wgDBtransactions ) {
2207                                 ignore_user_abort( $userAbort );
2208                         }
2209
2210                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2211                         if ( !$status->isOK() ) {
2212                                 wfProfileOut( __METHOD__ );
2213                                 return $status;
2214                         }
2215
2216                         # Invalidate cache of this article and all pages using this article
2217                         # as a template. Partly deferred.
2218                         Article::onArticleEdit( $this->mTitle );
2219                         # Update links tables, site stats, etc.
2220                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2221                 } else {
2222                         # Create new article
2223                         $status->value['new'] = true;
2224
2225                         # Set statistics members
2226                         # We work out if it's countable after PST to avoid counter drift
2227                         # when articles are created with {{subst:}}
2228                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2229                         $this->mTotalAdjustment = 1;
2230
2231                         $dbw->begin();
2232
2233                         # Add the page record; stake our claim on this title!
2234                         # This will return false if the article already exists
2235                         $newid = $this->insertOn( $dbw );
2236
2237                         if ( $newid === false ) {
2238                                 $dbw->rollback();
2239                                 $status->fatal( 'edit-already-exists' );
2240
2241                                 wfProfileOut( __METHOD__ );
2242                                 return $status;
2243                         }
2244
2245                         # Save the revision text...
2246                         $revision = new Revision( array(
2247                                 'page'       => $newid,
2248                                 'comment'    => $summary,
2249                                 'minor_edit' => $isminor,
2250                                 'text'       => $text,
2251                                 'user'       => $user->getId(),
2252                                 'user_text'  => $user->getName(),
2253                                 ) );
2254                         $revisionId = $revision->insertOn( $dbw );
2255
2256                         $this->mTitle->resetArticleID( $newid );
2257
2258                         # Update the page record with revision data
2259                         $this->updateRevisionOn( $dbw, $revision, 0 );
2260
2261                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2262
2263                         # Update recentchanges
2264                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2265                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2266
2267                                 # Mark as patrolled if the user can do so
2268                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2269                                 # Add RC row to the DB
2270                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2271                                         '', strlen( $text ), $revisionId, $patrolled );
2272
2273                                 # Log auto-patrolled edits
2274                                 if ( $patrolled ) {
2275                                         PatrolLog::record( $rc, true );
2276                                 }
2277                         }
2278                         $user->incEditCount();
2279                         $dbw->commit();
2280
2281                         # Update links, etc.
2282                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2283
2284                         # Clear caches
2285                         Article::onArticleCreate( $this->mTitle );
2286
2287                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2288                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2289                 }
2290
2291                 # Do updates right now unless deferral was requested
2292                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2293                         wfDoUpdates();
2294                 }
2295
2296                 // Return the new revision (or null) to the caller
2297                 $status->value['revision'] = $revision;
2298
2299                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2300                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2301
2302                 wfProfileOut( __METHOD__ );
2303                 return $status;
2304         }
2305
2306         /**
2307          * @deprecated wrapper for doRedirect
2308          */
2309         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2310                 wfDeprecated( __METHOD__ );
2311                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2312         }
2313
2314         /**
2315          * Output a redirect back to the article.
2316          * This is typically used after an edit.
2317          *
2318          * @param $noRedir Boolean: add redirect=no
2319          * @param $sectionAnchor String: section to redirect to, including "#"
2320          * @param $extraQuery String: extra query params
2321          */
2322         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2323                 global $wgOut;
2324
2325                 if ( $noRedir ) {
2326                         $query = 'redirect=no';
2327                         if ( $extraQuery )
2328                                 $query .= "&$extraQuery";
2329                 } else {
2330                         $query = $extraQuery;
2331                 }
2332
2333                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2334         }
2335
2336         /**
2337          * Mark this particular edit/page as patrolled
2338          */
2339         public function markpatrolled() {
2340                 global $wgOut, $wgUser, $wgRequest;
2341
2342                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2343
2344                 # If we haven't been given an rc_id value, we can't do anything
2345                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2346
2347                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
2348                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2349                         return;
2350                 }
2351
2352                 $rc = RecentChange::newFromId( $rcid );
2353
2354                 if ( is_null( $rc ) ) {
2355                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2356                         return;
2357                 }
2358
2359                 # It would be nice to see where the user had actually come from, but for now just guess
2360                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2361                 $return = SpecialPage::getTitleFor( $returnto );
2362
2363                 $errors = $rc->doMarkPatrolled();
2364
2365                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2366                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2367
2368                         return;
2369                 }
2370
2371                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2372                         // The hook itself has handled any output
2373                         return;
2374                 }
2375
2376                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2377                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2378                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2379                         $wgOut->returnToMain( false, $return );
2380
2381                         return;
2382                 }
2383
2384                 if ( !empty( $errors ) ) {
2385                         $wgOut->showPermissionsErrorPage( $errors );
2386
2387                         return;
2388                 }
2389
2390                 # Inform the user
2391                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2392                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2393                 $wgOut->returnToMain( false, $return );
2394         }
2395
2396         /**
2397          * User-interface handler for the "watch" action
2398          */
2399         public function watch() {
2400                 global $wgUser, $wgOut;
2401
2402                 if ( $wgUser->isAnon() ) {
2403                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2404                         return;
2405                 }
2406
2407                 if ( wfReadOnly() ) {
2408                         $wgOut->readOnlyPage();
2409                         return;
2410                 }
2411
2412                 if ( $this->doWatch() ) {
2413                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2414                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2415                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2416                 }
2417
2418                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2419         }
2420
2421         /**
2422          * Add this page to $wgUser's watchlist
2423          * @return bool true on successful watch operation
2424          */
2425         public function doWatch() {
2426                 global $wgUser;
2427
2428                 if ( $wgUser->isAnon() ) {
2429                         return false;
2430                 }
2431
2432                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2433                         $wgUser->addWatch( $this->mTitle );
2434                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2435                 }
2436
2437                 return false;
2438         }
2439
2440         /**
2441          * User interface handler for the "unwatch" action.
2442          */
2443         public function unwatch() {
2444                 global $wgUser, $wgOut;
2445
2446                 if ( $wgUser->isAnon() ) {
2447                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2448                         return;
2449                 }
2450
2451                 if ( wfReadOnly() ) {
2452                         $wgOut->readOnlyPage();
2453                         return;
2454                 }
2455
2456                 if ( $this->doUnwatch() ) {
2457                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2458                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2459                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2460                 }
2461
2462                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2463         }
2464
2465         /**
2466          * Stop watching a page
2467          * @return bool true on successful unwatch
2468          */
2469         public function doUnwatch() {
2470                 global $wgUser;
2471
2472                 if ( $wgUser->isAnon() ) {
2473                         return false;
2474                 }
2475
2476                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2477                         $wgUser->removeWatch( $this->mTitle );
2478                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2479                 }
2480
2481                 return false;
2482         }
2483
2484         /**
2485          * action=protect handler
2486          */
2487         public function protect() {
2488                 $form = new ProtectionForm( $this );
2489                 $form->execute();
2490         }
2491
2492         /**
2493          * action=unprotect handler (alias)
2494          */
2495         public function unprotect() {
2496                 $this->protect();
2497         }
2498
2499         /**
2500          * Update the article's restriction field, and leave a log entry.
2501          *
2502          * @param $limit Array: set of restriction keys
2503          * @param $reason String
2504          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2505          * @param $expiry Array: per restriction type expiration
2506          * @return bool true on success
2507          */
2508         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2509                 global $wgUser, $wgContLang;
2510
2511                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2512
2513                 $id = $this->mTitle->getArticleID();
2514
2515                 if ( $id <= 0 ) {
2516                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2517                         return false;
2518                 }
2519
2520                 if ( wfReadOnly() ) {
2521                         wfDebug( "updateRestrictions failed: read-only\n" );
2522                         return false;
2523                 }
2524
2525                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2526                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2527                         return false;
2528                 }
2529
2530                 if ( !$cascade ) {
2531                         $cascade = false;
2532                 }
2533
2534                 // Take this opportunity to purge out expired restrictions
2535                 Title::purgeExpiredRestrictions();
2536
2537                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2538                 # we expect a single selection, but the schema allows otherwise.
2539                 $current = array();
2540                 $updated = Article::flattenRestrictions( $limit );
2541                 $changed = false;
2542
2543                 foreach ( $restrictionTypes as $action ) {
2544                         if ( isset( $expiry[$action] ) ) {
2545                                 # Get current restrictions on $action
2546                                 $aLimits = $this->mTitle->getRestrictions( $action );
2547                                 $current[$action] = implode( '', $aLimits );
2548                                 # Are any actual restrictions being dealt with here?
2549                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2550
2551                                 # If something changed, we need to log it. Checking $aRChanged
2552                                 # assures that "unprotecting" a page that is not protected does
2553                                 # not log just because the expiry was "changed".
2554                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2555                                         $changed = true;
2556                                 }
2557                         }
2558                 }
2559
2560                 $current = Article::flattenRestrictions( $current );
2561
2562                 $changed = ( $changed || $current != $updated );
2563                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2564                 $protect = ( $updated != '' );
2565
2566                 # If nothing's changed, do nothing
2567                 if ( $changed ) {
2568                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2569                                 $dbw = wfGetDB( DB_MASTER );
2570
2571                                 # Prepare a null revision to be added to the history
2572                                 $modified = $current != '' && $protect;
2573
2574                                 if ( $protect ) {
2575                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2576                                 } else {
2577                                         $comment_type = 'unprotectedarticle';
2578                                 }
2579
2580                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2581
2582                                 # Only restrictions with the 'protect' right can cascade...
2583                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2584                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2585
2586                                 # The schema allows multiple restrictions
2587                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2588                                         $cascade = false;
2589                                 }
2590
2591                                 $cascade_description = '';
2592
2593                                 if ( $cascade ) {
2594                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2595                                 }
2596
2597                                 if ( $reason ) {
2598                                         $comment .= ": $reason";
2599                                 }
2600
2601                                 $editComment = $comment;
2602                                 $encodedExpiry = array();
2603                                 $protect_description = '';
2604                                 foreach ( $limit as $action => $restrictions ) {
2605                                         if ( !isset( $expiry[$action] ) )
2606                                                 $expiry[$action] = 'infinite';
2607
2608                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2609                                         if ( $restrictions != '' ) {
2610                                                 $protect_description .= "[$action=$restrictions] (";
2611                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2612                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2613                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2614                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2615                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2616                                                 } else {
2617                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2618                                                 }
2619
2620                                                 $protect_description .= ') ';
2621                                         }
2622                                 }
2623                                 $protect_description = trim( $protect_description );
2624
2625                                 if ( $protect_description && $protect ) {
2626                                         $editComment .= " ($protect_description)";
2627                                 }
2628
2629                                 if ( $cascade ) {
2630                                         $editComment .= "$cascade_description";
2631                                 }
2632
2633                                 # Update restrictions table
2634                                 foreach ( $limit as $action => $restrictions ) {
2635                                         if ( $restrictions != '' ) {
2636                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2637                                                         array( 'pr_page' => $id,
2638                                                                 'pr_type' => $action,
2639                                                                 'pr_level' => $restrictions,
2640                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2641                                                                 'pr_expiry' => $encodedExpiry[$action]
2642                                                         ),
2643                                                         __METHOD__
2644                                                 );
2645                                         } else {
2646                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2647                                                         'pr_type' => $action ), __METHOD__ );
2648                                         }
2649                                 }
2650
2651                                 # Insert a null revision
2652                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2653                                 $nullRevId = $nullRevision->insertOn( $dbw );
2654
2655                                 $latest = $this->getLatest();
2656                                 # Update page record
2657                                 $dbw->update( 'page',
2658                                         array( /* SET */
2659                                                 'page_touched' => $dbw->timestamp(),
2660                                                 'page_restrictions' => '',
2661                                                 'page_latest' => $nullRevId
2662                                         ), array( /* WHERE */
2663                                                 'page_id' => $id
2664                                         ), 'Article::protect'
2665                                 );
2666
2667                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2668                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2669
2670                                 # Update the protection log
2671                                 $log = new LogPage( 'protect' );
2672                                 if ( $protect ) {
2673                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2674                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2675                                 } else {
2676                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2677                                 }
2678                         } # End hook
2679                 } # End "changed" check
2680
2681                 return true;
2682         }
2683
2684         /**
2685          * Take an array of page restrictions and flatten it to a string
2686          * suitable for insertion into the page_restrictions field.
2687          * @param $limit Array
2688          * @return String
2689          */
2690         protected static function flattenRestrictions( $limit ) {
2691                 if ( !is_array( $limit ) ) {
2692                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2693                 }
2694
2695                 $bits = array();
2696                 ksort( $limit );
2697
2698                 foreach ( $limit as $action => $restrictions ) {
2699                         if ( $restrictions != '' ) {
2700                                 $bits[] = "$action=$restrictions";
2701                         }
2702                 }
2703
2704                 return implode( ':', $bits );
2705         }
2706
2707         /**
2708          * Auto-generates a deletion reason
2709          *
2710          * @param &$hasHistory Boolean: whether the page has a history
2711          * @return mixed String containing deletion reason or empty string, or boolean false
2712          *    if no revision occurred
2713          */
2714         public function generateReason( &$hasHistory ) {
2715                 global $wgContLang;
2716
2717                 $dbw = wfGetDB( DB_MASTER );
2718                 // Get the last revision
2719                 $rev = Revision::newFromTitle( $this->mTitle );
2720
2721                 if ( is_null( $rev ) ) {
2722                         return false;
2723                 }
2724
2725                 // Get the article's contents
2726                 $contents = $rev->getText();
2727                 $blank = false;
2728
2729                 // If the page is blank, use the text from the previous revision,
2730                 // which can only be blank if there's a move/import/protect dummy revision involved
2731                 if ( $contents == '' ) {
2732                         $prev = $rev->getPrevious();
2733
2734                         if ( $prev )    {
2735                                 $contents = $prev->getText();
2736                                 $blank = true;
2737                         }
2738                 }
2739
2740                 // Find out if there was only one contributor
2741                 // Only scan the last 20 revisions
2742                 $res = $dbw->select( 'revision', 'rev_user_text',
2743                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2744                         __METHOD__,
2745                         array( 'LIMIT' => 20 )
2746                 );
2747
2748                 if ( $res === false ) {
2749                         // This page has no revisions, which is very weird
2750                         return false;
2751                 }
2752
2753                 $hasHistory = ( $res->numRows() > 1 );
2754                 $row = $dbw->fetchObject( $res );
2755
2756                 if ( $row ) { // $row is false if the only contributor is hidden
2757                         $onlyAuthor = $row->rev_user_text;
2758                         // Try to find a second contributor
2759                         foreach ( $res as $row ) {
2760                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2761                                         $onlyAuthor = false;
2762                                         break;
2763                                 }
2764                         }
2765                 } else {
2766                         $onlyAuthor = false;
2767                 }
2768
2769                 // Generate the summary with a '$1' placeholder
2770                 if ( $blank ) {
2771                         // The current revision is blank and the one before is also
2772                         // blank. It's just not our lucky day
2773                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2774                 } else {
2775                         if ( $onlyAuthor ) {
2776                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2777                         } else {
2778                                 $reason = wfMsgForContent( 'excontent', '$1' );
2779                         }
2780                 }
2781
2782                 if ( $reason == '-' ) {
2783                         // Allow these UI messages to be blanked out cleanly
2784                         return '';
2785                 }
2786
2787                 // Replace newlines with spaces to prevent uglyness
2788                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2789                 // Calculate the maximum amount of chars to get
2790                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2791                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2792                 $contents = $wgContLang->truncate( $contents, $maxLength );
2793                 // Remove possible unfinished links
2794                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2795                 // Now replace the '$1' placeholder
2796                 $reason = str_replace( '$1', $contents, $reason );
2797
2798                 return $reason;
2799         }
2800
2801
2802         /*
2803          * UI entry point for page deletion
2804          */
2805         public function delete() {
2806                 global $wgUser, $wgOut, $wgRequest;
2807
2808                 $confirm = $wgRequest->wasPosted() &&
2809                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2810
2811                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2812                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2813
2814                 $reason = $this->DeleteReasonList;
2815
2816                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2817                         // Entry from drop down menu + additional comment
2818                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2819                 } elseif ( $reason == 'other' ) {
2820                         $reason = $this->DeleteReason;
2821                 }
2822
2823                 # Flag to hide all contents of the archived revisions
2824                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2825
2826                 # This code desperately needs to be totally rewritten
2827
2828                 # Read-only check...
2829                 if ( wfReadOnly() ) {
2830                         $wgOut->readOnlyPage();
2831
2832                         return;
2833                 }
2834
2835                 # Check permissions
2836                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2837
2838                 if ( count( $permission_errors ) > 0 ) {
2839                         $wgOut->showPermissionsErrorPage( $permission_errors );
2840
2841                         return;
2842                 }
2843
2844                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2845
2846                 # Better double-check that it hasn't been deleted yet!
2847                 $dbw = wfGetDB( DB_MASTER );
2848                 $conds = $this->mTitle->pageCond();
2849                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2850                 if ( $latest === false ) {
2851                         $wgOut->showFatalError(
2852                                 Html::rawElement(
2853                                         'div',
2854                                         array( 'class' => 'error mw-error-cannotdelete' ),
2855                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2856                                 )
2857                         );
2858                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2859                         LogEventsList::showLogExtract(
2860                                 $wgOut,
2861                                 'delete',
2862                                 $this->mTitle->getPrefixedText()
2863                         );
2864
2865                         return;
2866                 }
2867
2868                 # Hack for big sites
2869                 $bigHistory = $this->isBigDeletion();
2870                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2871                         global $wgLang, $wgDeleteRevisionsLimit;
2872
2873                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2874                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2875
2876                         return;
2877                 }
2878
2879                 if ( $confirm ) {
2880                         $this->doDelete( $reason, $suppress );
2881
2882                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2883                                 $this->doWatch();
2884                         } elseif ( $this->mTitle->userIsWatching() ) {
2885                                 $this->doUnwatch();
2886                         }
2887
2888                         return;
2889                 }
2890
2891                 // Generate deletion reason
2892                 $hasHistory = false;
2893                 if ( !$reason ) {
2894                         $reason = $this->generateReason( $hasHistory );
2895                 }
2896
2897                 // If the page has a history, insert a warning
2898                 if ( $hasHistory && !$confirm ) {
2899                         global $wgLang;
2900
2901                         $skin = $wgUser->getSkin();
2902                         $revisions = $this->estimateRevisionCount();
2903                         //FIXME: lego
2904                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2905                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2906                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2907                                 '</strong>'
2908                         );
2909
2910                         if ( $bigHistory ) {
2911                                 global $wgDeleteRevisionsLimit;
2912                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2913                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2914                         }
2915                 }
2916
2917                 return $this->confirmDelete( $reason );
2918         }
2919
2920         /**
2921          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2922          */
2923         public function isBigDeletion() {
2924                 global $wgDeleteRevisionsLimit;
2925
2926                 if ( $wgDeleteRevisionsLimit ) {
2927                         $revCount = $this->estimateRevisionCount();
2928
2929                         return $revCount > $wgDeleteRevisionsLimit;
2930                 }
2931
2932                 return false;
2933         }
2934
2935         /**
2936          * @return int approximate revision count
2937          */
2938         public function estimateRevisionCount() {
2939                 $dbr = wfGetDB( DB_SLAVE );
2940
2941                 // For an exact count...
2942                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2943                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2944                 return $dbr->estimateRowCount( 'revision', '*',
2945                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2946         }
2947
2948         /**
2949          * Get the last N authors
2950          * @param $num Integer: number of revisions to get
2951          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2952          * @return array Array of authors, duplicates not removed
2953          */
2954         public function getLastNAuthors( $num, $revLatest = 0 ) {
2955                 wfProfileIn( __METHOD__ );
2956                 // First try the slave
2957                 // If that doesn't have the latest revision, try the master
2958                 $continue = 2;
2959                 $db = wfGetDB( DB_SLAVE );
2960
2961                 do {
2962                         $res = $db->select( array( 'page', 'revision' ),
2963                                 array( 'rev_id', 'rev_user_text' ),
2964                                 array(
2965                                         'page_namespace' => $this->mTitle->getNamespace(),
2966                                         'page_title' => $this->mTitle->getDBkey(),
2967                                         'rev_page = page_id'
2968                                 ), __METHOD__, $this->getSelectOptions( array(
2969                                         'ORDER BY' => 'rev_timestamp DESC',
2970                                         'LIMIT' => $num
2971                                 ) )
2972                         );
2973
2974                         if ( !$res ) {
2975                                 wfProfileOut( __METHOD__ );
2976                                 return array();
2977                         }
2978
2979                         $row = $db->fetchObject( $res );
2980
2981                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2982                                 $db = wfGetDB( DB_MASTER );
2983                                 $continue--;
2984                         } else {
2985                                 $continue = 0;
2986                         }
2987                 } while ( $continue );
2988
2989                 $authors = array( $row->rev_user_text );
2990
2991                 while ( $row = $db->fetchObject( $res ) ) {
2992                         $authors[] = $row->rev_user_text;
2993                 }
2994
2995                 wfProfileOut( __METHOD__ );
2996                 return $authors;
2997         }
2998
2999         /**
3000          * Output deletion confirmation dialog
3001          * FIXME: Move to another file?
3002          * @param $reason String: prefilled reason
3003          */
3004         public function confirmDelete( $reason ) {
3005                 global $wgOut, $wgUser;
3006
3007                 wfDebug( "Article::confirmDelete\n" );
3008
3009                 $deleteBackLink = $wgUser->getSkin()->linkKnown( $this->mTitle );
3010                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3011                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3012                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3013
3014                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3015
3016                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3017                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3018                                         <td></td>
3019                                         <td class='mw-input'><strong>" .
3020                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3021                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3022                                         "</strong></td>
3023                                 </tr>";
3024                 } else {
3025                         $suppress = '';
3026                 }
3027                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3028
3029                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3030                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3031                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3032                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3033                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3034                         "<tr id=\"wpDeleteReasonListRow\">
3035                                 <td class='mw-label'>" .
3036                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3037                                 "</td>
3038                                 <td class='mw-input'>" .
3039                                         Xml::listDropDown( 'wpDeleteReasonList',
3040                                                 wfMsgForContent( 'deletereason-dropdown' ),
3041                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3042                                 "</td>
3043                         </tr>
3044                         <tr id=\"wpDeleteReasonRow\">
3045                                 <td class='mw-label'>" .
3046                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3047                                 "</td>
3048                                 <td class='mw-input'>" .
3049                                 Html::input( 'wpReason', $reason, 'text', array(
3050                                         'size' => '60',
3051                                         'maxlength' => '255',
3052                                         'tabindex' => '2',
3053                                         'id' => 'wpReason',
3054                                         'autofocus'
3055                                 ) ) .
3056                                 "</td>
3057                         </tr>";
3058
3059                 # Disallow watching if user is not logged in
3060                 if ( $wgUser->isLoggedIn() ) {
3061                         $form .= "
3062                         <tr>
3063                                 <td></td>
3064                                 <td class='mw-input'>" .
3065                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3066                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3067                                 "</td>
3068                         </tr>";
3069                 }
3070
3071                 $form .= "
3072                         $suppress
3073                         <tr>
3074                                 <td></td>
3075                                 <td class='mw-submit'>" .
3076                                         Xml::submitButton( wfMsg( 'deletepage' ),
3077                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3078                                 "</td>
3079                         </tr>" .
3080                         Xml::closeElement( 'table' ) .
3081                         Xml::closeElement( 'fieldset' ) .
3082                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
3083                         Xml::closeElement( 'form' );
3084
3085                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3086                                 $skin = $wgUser->getSkin();
3087                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3088                                 $link = $skin->link(
3089                                         $title,
3090                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3091                                         array(),
3092                                         array( 'action' => 'edit' )
3093                                 );
3094                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3095                         }
3096
3097                 $wgOut->addHTML( $form );
3098                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3099                 LogEventsList::showLogExtract( $wgOut, 'delete',
3100                         $this->mTitle->getPrefixedText()
3101                 );
3102         }
3103
3104         /**
3105          * Perform a deletion and output success or failure messages
3106          */
3107         public function doDelete( $reason, $suppress = false ) {
3108                 global $wgOut, $wgUser;
3109
3110                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3111
3112                 $error = '';
3113                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3114                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3115                                 $deleted = $this->mTitle->getPrefixedText();
3116
3117                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3118                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3119
3120                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3121
3122                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3123                                 $wgOut->returnToMain( false );
3124                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3125                         }
3126                 } else {
3127                         if ( $error == '' ) {
3128                                 $wgOut->showFatalError(
3129                                         Html::rawElement(
3130                                                 'div',
3131                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3132                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3133                                         )
3134                                 );
3135
3136                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3137
3138                                 LogEventsList::showLogExtract(
3139                                         $wgOut,
3140                                         'delete',
3141                                         $this->mTitle->getPrefixedText()
3142                                 );
3143                         } else {
3144                                 $wgOut->showFatalError( $error );
3145                         }
3146                 }
3147         }
3148
3149         /**
3150          * Back-end article deletion
3151          * Deletes the article with database consistency, writes logs, purges caches
3152          *
3153          * @param $reason string delete reason for deletion log
3154          * @param suppress bitfield
3155          *      Revision::DELETED_TEXT
3156          *      Revision::DELETED_COMMENT
3157          *      Revision::DELETED_USER
3158          *      Revision::DELETED_RESTRICTED
3159          * @param $id int article ID
3160          * @param $commit boolean defaults to true, triggers transaction end
3161          * @return boolean true if successful
3162          */
3163         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3164                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3165
3166                 wfDebug( __METHOD__ . "\n" );
3167
3168                 $dbw = wfGetDB( DB_MASTER );
3169                 $t = $this->mTitle->getDBkey();
3170                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3171
3172                 if ( $t === '' || $id == 0 ) {
3173                         return false;
3174                 }
3175
3176                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3177                 array_push( $wgDeferredUpdateList, $u );
3178
3179                 // Bitfields to further suppress the content
3180                 if ( $suppress ) {
3181                         $bitfield = 0;
3182                         // This should be 15...
3183                         $bitfield |= Revision::DELETED_TEXT;
3184                         $bitfield |= Revision::DELETED_COMMENT;
3185                         $bitfield |= Revision::DELETED_USER;
3186                         $bitfield |= Revision::DELETED_RESTRICTED;
3187                 } else {
3188                         $bitfield = 'rev_deleted';
3189                 }
3190
3191                 $dbw->begin();
3192                 // For now, shunt the revision data into the archive table.
3193                 // Text is *not* removed from the text table; bulk storage
3194                 // is left intact to avoid breaking block-compression or
3195                 // immutable storage schemes.
3196                 //
3197                 // For backwards compatibility, note that some older archive
3198                 // table entries will have ar_text and ar_flags fields still.
3199                 //
3200                 // In the future, we may keep revisions and mark them with
3201                 // the rev_deleted field, which is reserved for this purpose.
3202                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3203                         array(
3204                                 'ar_namespace'  => 'page_namespace',
3205                                 'ar_title'      => 'page_title',
3206                                 'ar_comment'    => 'rev_comment',
3207                                 'ar_user'       => 'rev_user',
3208                                 'ar_user_text'  => 'rev_user_text',
3209                                 'ar_timestamp'  => 'rev_timestamp',
3210                                 'ar_minor_edit' => 'rev_minor_edit',
3211                                 'ar_rev_id'     => 'rev_id',
3212                                 'ar_text_id'    => 'rev_text_id',
3213                                 'ar_text'       => '\'\'', // Be explicit to appease
3214                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3215                                 'ar_len'        => 'rev_len',
3216                                 'ar_page_id'    => 'page_id',
3217                                 'ar_deleted'    => $bitfield
3218                         ), array(
3219                                 'page_id' => $id,
3220                                 'page_id = rev_page'
3221                         ), __METHOD__
3222                 );
3223
3224                 # Delete restrictions for it
3225                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3226
3227                 # Now that it's safely backed up, delete it
3228                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3229                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3230
3231                 if ( !$ok ) {
3232                         $dbw->rollback();
3233                         return false;
3234                 }
3235
3236                 # Fix category table counts
3237                 $cats = array();
3238                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3239
3240                 foreach ( $res as $row ) {
3241                         $cats [] = $row->cl_to;
3242                 }
3243
3244                 $this->updateCategoryCounts( array(), $cats );
3245
3246                 # If using cascading deletes, we can skip some explicit deletes
3247                 if ( !$dbw->cascadingDeletes() ) {
3248                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3249
3250                         if ( $wgUseTrackbacks )
3251                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3252
3253                         # Delete outgoing links
3254                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3255                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3256                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3257                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3258                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3259                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3260                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3261                 }
3262
3263                 # If using cleanup triggers, we can skip some manual deletes
3264                 if ( !$dbw->cleanupTriggers() ) {
3265                         # Clean up recentchanges entries...
3266                         $dbw->delete( 'recentchanges',
3267                                 array( 'rc_type != ' . RC_LOG,
3268                                         'rc_namespace' => $this->mTitle->getNamespace(),
3269                                         'rc_title' => $this->mTitle->getDBkey() ),
3270                                 __METHOD__ );
3271                         $dbw->delete( 'recentchanges',
3272                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3273                                 __METHOD__ );
3274                 }
3275
3276                 # Clear caches
3277                 Article::onArticleDelete( $this->mTitle );
3278
3279                 # Clear the cached article id so the interface doesn't act like we exist
3280                 $this->mTitle->resetArticleID( 0 );
3281
3282                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3283                 $logtype = $suppress ? 'suppress' : 'delete';
3284                 $log = new LogPage( $logtype );
3285
3286                 # Make sure logging got through
3287                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3288
3289                 if ( $commit ) {
3290                         $dbw->commit();
3291                 }
3292
3293                 return true;
3294         }
3295
3296         /**
3297          * Roll back the most recent consecutive set of edits to a page
3298          * from the same user; fails if there are no eligible edits to
3299          * roll back to, e.g. user is the sole contributor. This function
3300          * performs permissions checks on $wgUser, then calls commitRollback()
3301          * to do the dirty work
3302          *
3303          * @param $fromP String: Name of the user whose edits to rollback.
3304          * @param $summary String: Custom summary. Set to default summary if empty.
3305          * @param $token String: Rollback token.
3306          * @param $bot Boolean: If true, mark all reverted edits as bot.
3307          *
3308          * @param $resultDetails Array: contains result-specific array of additional values
3309          *    'alreadyrolled' : 'current' (rev)
3310          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3311          *
3312          * @return array of errors, each error formatted as
3313          *   array(messagekey, param1, param2, ...).
3314          * On success, the array is empty.  This array can also be passed to
3315          * OutputPage::showPermissionsErrorPage().
3316          */
3317         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3318                 global $wgUser;
3319
3320                 $resultDetails = null;
3321
3322                 # Check permissions
3323                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3324                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3325                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3326
3327                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3328                         $errors[] = array( 'sessionfailure' );
3329                 }
3330
3331                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3332                         $errors[] = array( 'actionthrottledtext' );
3333                 }
3334
3335                 # If there were errors, bail out now
3336                 if ( !empty( $errors ) ) {
3337                         return $errors;
3338                 }
3339
3340                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3341         }
3342
3343         /**
3344          * Backend implementation of doRollback(), please refer there for parameter
3345          * and return value documentation
3346          *
3347          * NOTE: This function does NOT check ANY permissions, it just commits the
3348          * rollback to the DB Therefore, you should only call this function direct-
3349          * ly if you want to use custom permissions checks. If you don't, use
3350          * doRollback() instead.
3351          */
3352         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3353                 global $wgUseRCPatrol, $wgUser, $wgLang;
3354
3355                 $dbw = wfGetDB( DB_MASTER );
3356
3357                 if ( wfReadOnly() ) {
3358                         return array( array( 'readonlytext' ) );
3359                 }
3360
3361                 # Get the last editor
3362                 $current = Revision::newFromTitle( $this->mTitle );
3363                 if ( is_null( $current ) ) {
3364                         # Something wrong... no page?
3365                         return array( array( 'notanarticle' ) );
3366                 }
3367
3368                 $from = str_replace( '_', ' ', $fromP );
3369                 # User name given should match up with the top revision.
3370                 # If the user was deleted then $from should be empty.
3371                 if ( $from != $current->getUserText() ) {
3372                         $resultDetails = array( 'current' => $current );
3373                         return array( array( 'alreadyrolled',
3374                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3375                                 htmlspecialchars( $fromP ),
3376                                 htmlspecialchars( $current->getUserText() )
3377                         ) );
3378                 }
3379
3380                 # Get the last edit not by this guy...
3381                 # Note: these may not be public values
3382                 $user = intval( $current->getRawUser() );
3383                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3384                 $s = $dbw->selectRow( 'revision',
3385                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3386                         array( 'rev_page' => $current->getPage(),
3387                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3388                         ), __METHOD__,
3389                         array( 'USE INDEX' => 'page_timestamp',
3390                                 'ORDER BY' => 'rev_timestamp DESC' )
3391                         );
3392                 if ( $s === false ) {
3393                         # No one else ever edited this page
3394                         return array( array( 'cantrollback' ) );
3395                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3396                         # Only admins can see this text
3397                         return array( array( 'notvisiblerev' ) );
3398                 }
3399
3400                 $set = array();
3401                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3402                         # Mark all reverted edits as bot
3403                         $set['rc_bot'] = 1;
3404                 }
3405
3406                 if ( $wgUseRCPatrol ) {
3407                         # Mark all reverted edits as patrolled
3408                         $set['rc_patrolled'] = 1;
3409                 }
3410
3411                 if ( count( $set ) ) {
3412                         $dbw->update( 'recentchanges', $set,
3413                                 array( /* WHERE */
3414                                         'rc_cur_id' => $current->getPage(),
3415                                         'rc_user_text' => $current->getUserText(),
3416                                         "rc_timestamp > '{$s->rev_timestamp}'",
3417                                 ), __METHOD__
3418                         );
3419                 }
3420
3421                 # Generate the edit summary if necessary
3422                 $target = Revision::newFromId( $s->rev_id );
3423                 if ( empty( $summary ) ) {
3424                         if ( $from == '' ) { // no public user name
3425                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3426                         } else {
3427                                 $summary = wfMsgForContent( 'revertpage' );
3428                         }
3429                 }
3430
3431                 # Allow the custom summary to use the same args as the default message
3432                 $args = array(
3433                         $target->getUserText(), $from, $s->rev_id,
3434                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3435                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3436                 );
3437                 $summary = wfMsgReplaceArgs( $summary, $args );
3438
3439                 # Save
3440                 $flags = EDIT_UPDATE;
3441
3442                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3443                         $flags |= EDIT_MINOR;
3444                 }
3445
3446                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3447                         $flags |= EDIT_FORCE_BOT;
3448                 }
3449
3450                 # Actually store the edit
3451                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3452                 if ( !empty( $status->value['revision'] ) ) {
3453                         $revId = $status->value['revision']->getId();
3454                 } else {
3455                         $revId = false;
3456                 }
3457
3458                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3459
3460                 $resultDetails = array(
3461                         'summary' => $summary,
3462                         'current' => $current,
3463                         'target'  => $target,
3464                         'newid'   => $revId
3465                 );
3466
3467                 return array();
3468         }
3469
3470         /**
3471          * User interface for rollback operations
3472          */
3473         public function rollback() {
3474                 global $wgUser, $wgOut, $wgRequest;
3475
3476                 $details = null;
3477
3478                 $result = $this->doRollback(
3479                         $wgRequest->getVal( 'from' ),
3480                         $wgRequest->getText( 'summary' ),
3481                         $wgRequest->getVal( 'token' ),
3482                         $wgRequest->getBool( 'bot' ),
3483                         $details
3484                 );
3485
3486                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3487                         $wgOut->rateLimited();
3488                         return;
3489                 }
3490
3491                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3492                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3493                         $errArray = $result[0];
3494                         $errMsg = array_shift( $errArray );
3495                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3496
3497                         if ( isset( $details['current'] ) ) {
3498                                 $current = $details['current'];
3499
3500                                 if ( $current->getComment() != '' ) {
3501                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3502                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3503                                 }
3504                         }
3505
3506                         return;
3507                 }
3508
3509                 # Display permissions errors before read-only message -- there's no
3510                 # point in misleading the user into thinking the inability to rollback
3511                 # is only temporary.
3512                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3513                         # array_diff is completely broken for arrays of arrays, sigh.
3514                         # Remove any 'readonlytext' error manually.
3515                         $out = array();
3516                         foreach ( $result as $error ) {
3517                                 if ( $error != array( 'readonlytext' ) ) {
3518                                         $out [] = $error;
3519                                 }
3520                         }
3521                         $wgOut->showPermissionsErrorPage( $out );
3522
3523                         return;
3524                 }
3525
3526                 if ( $result == array( array( 'readonlytext' ) ) ) {
3527                         $wgOut->readOnlyPage();
3528
3529                         return;
3530                 }
3531
3532                 $current = $details['current'];
3533                 $target = $details['target'];
3534                 $newId = $details['newid'];
3535                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3536                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3537
3538                 if ( $current->getUserText() === '' ) {
3539                         $old = wfMsg( 'rev-deleted-user' );
3540                 } else {
3541                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3542                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3543                 }
3544
3545                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3546                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3547                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3548                 $wgOut->returnToMain( false, $this->mTitle );
3549
3550                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3551                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3552                         $de->showDiff( '', '' );
3553                 }
3554         }
3555
3556         /**
3557          * Do standard deferred updates after page view
3558          */
3559         public function viewUpdates() {
3560                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3561                 if ( wfReadOnly() ) {
3562                         return;
3563                 }
3564
3565                 # Don't update page view counters on views from bot users (bug 14044)
3566                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3567                         Article::incViewCount( $this->getID() );
3568                         $u = new SiteStatsUpdate( 1, 0, 0 );
3569                         array_push( $wgDeferredUpdateList, $u );
3570                 }
3571
3572                 # Update newtalk / watchlist notification status
3573                 $wgUser->clearNotification( $this->mTitle );
3574         }
3575
3576         /**
3577          * Prepare text which is about to be saved.
3578          * Returns a stdclass with source, pst and output members
3579          */
3580         public function prepareTextForEdit( $text, $revid = null ) {
3581                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3582                         // Already prepared
3583                         return $this->mPreparedEdit;
3584                 }
3585
3586                 global $wgParser;
3587
3588                 $edit = (object)array();
3589                 $edit->revid = $revid;
3590                 $edit->newText = $text;
3591                 $edit->pst = $this->preSaveTransform( $text );
3592                 $edit->popts = clone $this->getParserOptions();
3593                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3594                 $edit->oldText = $this->getContent();
3595
3596                 $this->mPreparedEdit = $edit;
3597
3598                 return $edit;
3599         }
3600
3601         /**
3602          * Do standard deferred updates after page edit.
3603          * Update links tables, site stats, search index and message cache.
3604          * Purges pages that include this page if the text was changed here.
3605          * Every 100th edit, prune the recent changes table.
3606          *
3607          * @private
3608          * @param $text New text of the article
3609          * @param $summary Edit summary
3610          * @param $minoredit Minor edit
3611          * @param $timestamp_of_pagechange Timestamp associated with the page change
3612          * @param $newid rev_id value of the new revision
3613          * @param $changed Whether or not the content actually changed
3614          */
3615         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3616                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3617
3618                 wfProfileIn( __METHOD__ );
3619
3620                 # Parse the text
3621                 # Be careful not to double-PST: $text is usually already PST-ed once
3622                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3623                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3624                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3625                 } else {
3626                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3627                         $editInfo = $this->mPreparedEdit;
3628                 }
3629
3630                 # Save it to the parser cache
3631                 if ( $wgEnableParserCache ) {
3632                         $parserCache = ParserCache::singleton();
3633                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3634                 }
3635
3636                 # Update the links tables
3637                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3638                 $u->doUpdate();
3639
3640                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3641
3642                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3643                         if ( 0 == mt_rand( 0, 99 ) ) {
3644                                 // Flush old entries from the `recentchanges` table; we do this on
3645                                 // random requests so as to avoid an increase in writes for no good reason
3646                                 global $wgRCMaxAge;
3647
3648                                 $dbw = wfGetDB( DB_MASTER );
3649                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3650                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3651                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3652
3653                                 $dbw->query( $sql );
3654                         }
3655                 }
3656
3657                 $id = $this->getID();
3658                 $title = $this->mTitle->getPrefixedDBkey();
3659                 $shortTitle = $this->mTitle->getDBkey();
3660
3661                 if ( 0 == $id ) {
3662                         wfProfileOut( __METHOD__ );
3663                         return;
3664                 }
3665
3666                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3667                 array_push( $wgDeferredUpdateList, $u );
3668                 $u = new SearchUpdate( $id, $title, $text );
3669                 array_push( $wgDeferredUpdateList, $u );
3670
3671                 # If this is another user's talk page, update newtalk
3672                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3673                 # load of user talk pages and piss people off, nor if it's a minor edit
3674                 # by a properly-flagged bot.
3675                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3676                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3677                 ) {
3678                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3679                                 $other = User::newFromName( $shortTitle, false );
3680                                 if ( !$other ) {
3681                                         wfDebug( __METHOD__ . ": invalid username\n" );
3682                                 } elseif ( User::isIP( $shortTitle ) ) {
3683                                         // An anonymous user
3684                                         $other->setNewtalk( true );
3685                                 } elseif ( $other->isLoggedIn() ) {
3686                                         $other->setNewtalk( true );
3687                                 } else {
3688                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3689                                 }
3690                         }
3691                 }
3692
3693                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3694                         $wgMessageCache->replace( $shortTitle, $text );
3695                 }
3696
3697                 wfProfileOut( __METHOD__ );
3698         }
3699
3700         /**
3701          * Perform article updates on a special page creation.
3702          *
3703          * @param $rev Revision object
3704          *
3705          * @todo This is a shitty interface function. Kill it and replace the
3706          * other shitty functions like editUpdates and such so it's not needed
3707          * anymore.
3708          */
3709         public function createUpdates( $rev ) {
3710                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3711                 $this->mTotalAdjustment = 1;
3712                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3713                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3714         }
3715
3716         /**
3717          * Generate the navigation links when browsing through an article revisions
3718          * It shows the information as:
3719          *   Revision as of \<date\>; view current revision
3720          *   \<- Previous version | Next Version -\>
3721          *
3722          * @param $oldid String: revision ID of this article revision
3723          */
3724         public function setOldSubtitle( $oldid = 0 ) {
3725                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3726
3727                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3728                         return;
3729                 }
3730
3731                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3732
3733                 # Cascade unhide param in links for easy deletion browsing
3734                 $extraParams = array();
3735                 if ( $wgRequest->getVal( 'unhide' ) ) {
3736                         $extraParams['unhide'] = 1;
3737                 }
3738
3739                 $revision = Revision::newFromId( $oldid );
3740
3741                 $current = ( $oldid == $this->mLatest );
3742                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3743                 $tddate = $wgLang->date( $this->mTimestamp, true );
3744                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3745                 $sk = $wgUser->getSkin();
3746                 $lnk = $current
3747                         ? wfMsgHtml( 'currentrevisionlink' )
3748                         : $sk->link(
3749                                 $this->mTitle,
3750                                 wfMsgHtml( 'currentrevisionlink' ),
3751                                 array(),
3752                                 $extraParams,
3753                                 array( 'known', 'noclasses' )
3754                         );
3755                 $curdiff = $current
3756                         ? wfMsgHtml( 'diff' )
3757                         : $sk->link(
3758                                 $this->mTitle,
3759                                 wfMsgHtml( 'diff' ),
3760                                 array(),
3761                                 array(
3762                                         'diff' => 'cur',
3763                                         'oldid' => $oldid
3764                                 ) + $extraParams,
3765                                 array( 'known', 'noclasses' )
3766                         );
3767                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3768                 $prevlink = $prev
3769                         ? $sk->link(
3770                                 $this->mTitle,
3771                                 wfMsgHtml( 'previousrevision' ),
3772                                 array(),
3773                                 array(
3774                                         'direction' => 'prev',
3775                                         'oldid' => $oldid
3776                                 ) + $extraParams,
3777                                 array( 'known', 'noclasses' )
3778                         )
3779                         : wfMsgHtml( 'previousrevision' );
3780                 $prevdiff = $prev
3781                         ? $sk->link(
3782                                 $this->mTitle,
3783                                 wfMsgHtml( 'diff' ),
3784                                 array(),
3785                                 array(
3786                                         'diff' => 'prev',
3787                                         'oldid' => $oldid
3788                                 ) + $extraParams,
3789                                 array( 'known', 'noclasses' )
3790                         )
3791                         : wfMsgHtml( 'diff' );
3792                 $nextlink = $current
3793                         ? wfMsgHtml( 'nextrevision' )
3794                         : $sk->link(
3795                                 $this->mTitle,
3796                                 wfMsgHtml( 'nextrevision' ),
3797                                 array(),
3798                                 array(
3799                                         'direction' => 'next',
3800                                         'oldid' => $oldid
3801                                 ) + $extraParams,
3802                                 array( 'known', 'noclasses' )
3803                         );
3804                 $nextdiff = $current
3805                         ? wfMsgHtml( 'diff' )
3806                         : $sk->link(
3807                                 $this->mTitle,
3808                                 wfMsgHtml( 'diff' ),
3809                                 array(),
3810                                 array(
3811                                         'diff' => 'next',
3812                                         'oldid' => $oldid
3813                                 ) + $extraParams,
3814                                 array( 'known', 'noclasses' )
3815                         );
3816
3817                 $cdel = '';
3818
3819                 // User can delete revisions or view deleted revisions...
3820                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3821                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3822                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3823                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3824                         } else {
3825                                 $query = array(
3826                                         'type'   => 'revision',
3827                                         'target' => $this->mTitle->getPrefixedDbkey(),
3828                                         'ids'    => $oldid
3829                                 );
3830                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3831                         }
3832                         $cdel .= ' ';
3833                 }
3834
3835                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3836                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3837
3838                 $m = wfMsg( 'revision-info-current' );
3839                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3840                         ? 'revision-info-current'
3841                         : 'revision-info';
3842
3843                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3844                         wfMsgExt(
3845                                 $infomsg,
3846                                 array( 'parseinline', 'replaceafter' ),
3847                                 $td,
3848                                 $userlinks,
3849                                 $revision->getID(),
3850                                 $tddate,
3851                                 $tdtime,
3852                                 $revision->getUser()
3853                         ) .
3854                         "</div>\n" .
3855                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3856                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3857
3858                 $wgOut->setSubtitle( $r );
3859         }
3860
3861         /**
3862          * This function is called right before saving the wikitext,
3863          * so we can do things like signatures and links-in-context.
3864          *
3865          * @param $text String article contents
3866          * @return string article contents with altered wikitext markup (signatures
3867          *      converted, {{subst:}}, templates, etc.)
3868          */
3869         public function preSaveTransform( $text ) {
3870                 global $wgParser, $wgUser;
3871
3872                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3873         }
3874
3875         /* Caching functions */
3876
3877         /**
3878          * checkLastModified returns true if it has taken care of all
3879          * output to the client that is necessary for this request.
3880          * (that is, it has sent a cached version of the page)
3881          *
3882          * @return boolean true if cached version send, false otherwise
3883          */
3884         protected function tryFileCache() {
3885                 static $called = false;
3886
3887                 if ( $called ) {
3888                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3889                         return false;
3890                 }
3891
3892                 $called = true;
3893                 if ( $this->isFileCacheable() ) {
3894                         $cache = new HTMLFileCache( $this->mTitle );
3895                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3896                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3897                                 $cache->loadFromFileCache();
3898                                 return true;
3899                         } else {
3900                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3901                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3902                         }
3903                 } else {
3904                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3905                 }
3906
3907                 return false;
3908         }
3909
3910         /**
3911          * Check if the page can be cached
3912          * @return bool
3913          */
3914         public function isFileCacheable() {
3915                 $cacheable = false;
3916
3917                 if ( HTMLFileCache::useFileCache() ) {
3918                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3919                         // Extension may have reason to disable file caching on some pages.
3920                         if ( $cacheable ) {
3921                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3922                         }
3923                 }
3924
3925                 return $cacheable;
3926         }
3927
3928         /**
3929          * Loads page_touched and returns a value indicating if it should be used
3930          * @return boolean true if not a redirect
3931          */
3932         public function checkTouched() {
3933                 if ( !$this->mDataLoaded ) {
3934                         $this->loadPageData();
3935                 }
3936
3937                 return !$this->mIsRedirect;
3938         }
3939
3940         /**
3941          * Get the page_touched field
3942          * @return string containing GMT timestamp
3943          */
3944         public function getTouched() {
3945                 if ( !$this->mDataLoaded ) {
3946                         $this->loadPageData();
3947                 }
3948
3949                 return $this->mTouched;
3950         }
3951
3952         /**
3953          * Get the page_latest field
3954          * @return integer rev_id of current revision
3955          */
3956         public function getLatest() {
3957                 if ( !$this->mDataLoaded ) {
3958                         $this->loadPageData();
3959                 }
3960
3961                 return (int)$this->mLatest;
3962         }
3963
3964         /**
3965          * Edit an article without doing all that other stuff
3966          * The article must already exist; link tables etc
3967          * are not updated, caches are not flushed.
3968          *
3969          * @param $text String: text submitted
3970          * @param $comment String: comment submitted
3971          * @param $minor Boolean: whereas it's a minor modification
3972          */
3973         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3974                 wfProfileIn( __METHOD__ );
3975
3976                 $dbw = wfGetDB( DB_MASTER );
3977                 $revision = new Revision( array(
3978                         'page'       => $this->getId(),
3979                         'text'       => $text,
3980                         'comment'    => $comment,
3981                         'minor_edit' => $minor ? 1 : 0,
3982                         ) );
3983                 $revision->insertOn( $dbw );
3984                 $this->updateRevisionOn( $dbw, $revision );
3985
3986                 global $wgUser;
3987                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3988
3989                 wfProfileOut( __METHOD__ );
3990         }
3991
3992         /**
3993          * Used to increment the view counter
3994          *
3995          * @param $id Integer: article id
3996          */
3997         public static function incViewCount( $id ) {
3998                 $id = intval( $id );
3999
4000                 global $wgHitcounterUpdateFreq;
4001
4002                 $dbw = wfGetDB( DB_MASTER );
4003                 $pageTable = $dbw->tableName( 'page' );
4004                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4005                 $acchitsTable = $dbw->tableName( 'acchits' );
4006                 $dbType = $dbw->getType();
4007
4008                 if ( $wgHitcounterUpdateFreq <= 1 || $dbType == 'sqlite' ) {
4009                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4010
4011                         return;
4012                 }
4013
4014                 # Not important enough to warrant an error page in case of failure
4015                 $oldignore = $dbw->ignoreErrors( true );
4016
4017                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4018
4019                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4020                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4021                         # Most of the time (or on SQL errors), skip row count check
4022                         $dbw->ignoreErrors( $oldignore );
4023
4024                         return;
4025                 }
4026
4027                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4028                 $row = $dbw->fetchObject( $res );
4029                 $rown = intval( $row->n );
4030
4031                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4032                         wfProfileIn( 'Article::incViewCount-collect' );
4033                         $old_user_abort = ignore_user_abort( true );
4034
4035                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4036                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4037                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4038                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4039                                 'GROUP BY hc_id', __METHOD__ );
4040                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4041                         $dbw->unlockTables( __METHOD__ );
4042
4043                         if ( $dbType == 'mysql' ) {
4044                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4045                                         'WHERE page_id = hc_id', __METHOD__ );
4046                         } else {
4047                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4048                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4049                         }
4050                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4051
4052                         ignore_user_abort( $old_user_abort );
4053                         wfProfileOut( 'Article::incViewCount-collect' );
4054                 }
4055
4056                 $dbw->ignoreErrors( $oldignore );
4057         }
4058
4059         /**#@+
4060          * The onArticle*() functions are supposed to be a kind of hooks
4061          * which should be called whenever any of the specified actions
4062          * are done.
4063          *
4064          * This is a good place to put code to clear caches, for instance.
4065          *
4066          * This is called on page move and undelete, as well as edit
4067          *
4068          * @param $title a title object
4069          */
4070         public static function onArticleCreate( $title ) {
4071                 # Update existence markers on article/talk tabs...
4072                 if ( $title->isTalkPage() ) {
4073                         $other = $title->getSubjectPage();
4074                 } else {
4075                         $other = $title->getTalkPage();
4076                 }
4077
4078                 $other->invalidateCache();
4079                 $other->purgeSquid();
4080
4081                 $title->touchLinks();
4082                 $title->purgeSquid();
4083                 $title->deleteTitleProtection();
4084         }
4085
4086         /**
4087          * Clears caches when article is deleted
4088          */
4089         public static function onArticleDelete( $title ) {
4090                 global $wgMessageCache;
4091
4092                 # Update existence markers on article/talk tabs...
4093                 if ( $title->isTalkPage() ) {
4094                         $other = $title->getSubjectPage();
4095                 } else {
4096                         $other = $title->getTalkPage();
4097                 }
4098
4099                 $other->invalidateCache();
4100                 $other->purgeSquid();
4101
4102                 $title->touchLinks();
4103                 $title->purgeSquid();
4104
4105                 # File cache
4106                 HTMLFileCache::clearFileCache( $title );
4107
4108                 # Messages
4109                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4110                         $wgMessageCache->replace( $title->getDBkey(), false );
4111                 }
4112
4113                 # Images
4114                 if ( $title->getNamespace() == NS_FILE ) {
4115                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4116                         $update->doUpdate();
4117                 }
4118
4119                 # User talk pages
4120                 if ( $title->getNamespace() == NS_USER_TALK ) {
4121                         $user = User::newFromName( $title->getText(), false );
4122                         $user->setNewtalk( false );
4123                 }
4124
4125                 # Image redirects
4126                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4127         }
4128
4129         /**
4130          * Purge caches on page update etc
4131          *
4132          * @param $title Title object
4133          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4134          */
4135         public static function onArticleEdit( $title ) {
4136                 global $wgDeferredUpdateList;
4137
4138                 // Invalidate caches of articles which include this page
4139                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4140
4141                 // Invalidate the caches of all pages which redirect here
4142                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4143
4144                 # Purge squid for this page only
4145                 $title->purgeSquid();
4146
4147                 # Clear file cache for this page only
4148                 HTMLFileCache::clearFileCache( $title );
4149         }
4150
4151         /**#@-*/
4152
4153         /**
4154          * Overriden by ImagePage class, only present here to avoid a fatal error
4155          * Called for ?action=revert
4156          */
4157         public function revert() {
4158                 global $wgOut;
4159                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4160         }
4161
4162         /**
4163          * Info about this page
4164          * Called for ?action=info when $wgAllowPageInfo is on.
4165          */
4166         public function info() {
4167                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4168
4169                 if ( !$wgAllowPageInfo ) {
4170                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4171                         return;
4172                 }
4173
4174                 $page = $this->mTitle->getSubjectPage();
4175
4176                 $wgOut->setPagetitle( $page->getPrefixedText() );
4177                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4178                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4179
4180                 if ( !$this->mTitle->exists() ) {
4181                         $wgOut->addHTML( '<div class="noarticletext">' );
4182                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4183                                 // This doesn't quite make sense; the user is asking for
4184                                 // information about the _page_, not the message... -- RC
4185                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4186                         } else {
4187                                 $msg = $wgUser->isLoggedIn()
4188                                         ? 'noarticletext'
4189                                         : 'noarticletextanon';
4190                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4191                         }
4192
4193                         $wgOut->addHTML( '</div>' );
4194                 } else {
4195                         $dbr = wfGetDB( DB_SLAVE );
4196                         $wl_clause = array(
4197                                 'wl_title'     => $page->getDBkey(),
4198                                 'wl_namespace' => $page->getNamespace() );
4199                         $numwatchers = $dbr->selectField(
4200                                 'watchlist',
4201                                 'COUNT(*)',
4202                                 $wl_clause,
4203                                 __METHOD__,
4204                                 $this->getSelectOptions() );
4205
4206                         $pageInfo = $this->pageCountInfo( $page );
4207                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4208
4209
4210                         //FIXME: unescaped messages
4211                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4212                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4213
4214                         if ( $talkInfo ) {
4215                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4216                         }
4217
4218                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4219
4220                         if ( $talkInfo ) {
4221                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4222                         }
4223
4224                         $wgOut->addHTML( '</ul>' );
4225                 }
4226         }
4227
4228         /**
4229          * Return the total number of edits and number of unique editors
4230          * on a given page. If page does not exist, returns false.
4231          *
4232          * @param $title Title object
4233          * @return mixed array or boolean false
4234          */
4235         public function pageCountInfo( $title ) {
4236                 $id = $title->getArticleId();
4237
4238                 if ( $id == 0 ) {
4239                         return false;
4240                 }
4241
4242                 $dbr = wfGetDB( DB_SLAVE );
4243                 $rev_clause = array( 'rev_page' => $id );
4244                 $edits = $dbr->selectField(
4245                         'revision',
4246                         'COUNT(rev_page)',
4247                         $rev_clause,
4248                         __METHOD__,
4249                         $this->getSelectOptions()
4250                 );
4251                 $authors = $dbr->selectField(
4252                         'revision',
4253                         'COUNT(DISTINCT rev_user_text)',
4254                         $rev_clause,
4255                         __METHOD__,
4256                         $this->getSelectOptions()
4257                 );
4258
4259                 return array( 'edits' => $edits, 'authors' => $authors );
4260         }
4261
4262         /**
4263          * Return a list of templates used by this article.
4264          * Uses the templatelinks table
4265          *
4266          * @return Array of Title objects
4267          */
4268         public function getUsedTemplates() {
4269                 $result = array();
4270                 $id = $this->mTitle->getArticleID();
4271
4272                 if ( $id == 0 ) {
4273                         return array();
4274                 }
4275
4276                 $dbr = wfGetDB( DB_SLAVE );
4277                 $res = $dbr->select( array( 'templatelinks' ),
4278                         array( 'tl_namespace', 'tl_title' ),
4279                         array( 'tl_from' => $id ),
4280                         __METHOD__ );
4281
4282                 if ( $res !== false ) {
4283                         foreach ( $res as $row ) {
4284                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4285                         }
4286                 }
4287
4288                 return $result;
4289         }
4290
4291         /**
4292          * Returns a list of hidden categories this page is a member of.
4293          * Uses the page_props and categorylinks tables.
4294          *
4295          * @return Array of Title objects
4296          */
4297         public function getHiddenCategories() {
4298                 $result = array();
4299                 $id = $this->mTitle->getArticleID();
4300
4301                 if ( $id == 0 ) {
4302                         return array();
4303                 }
4304
4305                 $dbr = wfGetDB( DB_SLAVE );
4306                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4307                         array( 'cl_to' ),
4308                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4309                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4310                         __METHOD__ );
4311
4312                 if ( $res !== false ) {
4313                         foreach ( $res as $row ) {
4314                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4315                         }
4316                 }
4317
4318                 return $result;
4319         }
4320
4321         /**
4322         * Return an applicable autosummary if one exists for the given edit.
4323         * @param $oldtext String: the previous text of the page.
4324         * @param $newtext String: The submitted text of the page.
4325         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4326         * @return string An appropriate autosummary, or an empty string.
4327         */
4328         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4329                 global $wgContLang;
4330
4331                 # Decide what kind of autosummary is needed.
4332
4333                 # Redirect autosummaries
4334                 $ot = Title::newFromRedirect( $oldtext );
4335                 $rt = Title::newFromRedirect( $newtext );
4336
4337                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4338                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4339                 }
4340
4341                 # New page autosummaries
4342                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4343                         # If they're making a new article, give its text, truncated, in the summary.
4344
4345                         $truncatedtext = $wgContLang->truncate(
4346                                 str_replace( "\n", ' ', $newtext ),
4347                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4348
4349                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4350                 }
4351
4352                 # Blanking autosummaries
4353                 if ( $oldtext != '' && $newtext == '' ) {
4354                         return wfMsgForContent( 'autosumm-blank' );
4355                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4356                         # Removing more than 90% of the article
4357
4358                         $truncatedtext = $wgContLang->truncate(
4359                                 $newtext,
4360                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4361
4362                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4363                 }
4364
4365                 # If we reach this point, there's no applicable autosummary for our case, so our
4366                 # autosummary is empty.
4367                 return '';
4368         }
4369
4370         /**
4371          * Add the primary page-view wikitext to the output buffer
4372          * Saves the text into the parser cache if possible.
4373          * Updates templatelinks if it is out of date.
4374          *
4375          * @param $text String
4376          * @param $cache Boolean
4377          * @param $parserOptions mixed ParserOptions object, or boolean false
4378          */
4379         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4380                 global $wgOut;
4381
4382                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4383                 $wgOut->addParserOutput( $this->mParserOutput );
4384         }
4385
4386         /**
4387          * This does all the heavy lifting for outputWikitext, except it returns the parser
4388          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4389          * say, embedding thread pages within a discussion system (LiquidThreads)
4390          *
4391          * @param $text string
4392          * @param $cache boolean
4393          * @param $parserOptions parsing options, defaults to false
4394          * @return string containing parsed output
4395          */
4396         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4397                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4398
4399                 if ( !$parserOptions ) {
4400                         $parserOptions = clone $this->getParserOptions();
4401                 }
4402
4403                 $time = - wfTime();
4404                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4405                         $parserOptions, true, true, $this->getRevIdFetched() );
4406                 $time += wfTime();
4407
4408                 # Timing hack
4409                 if ( $time > 3 ) {
4410                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4411                                 $this->mTitle->getPrefixedDBkey() ) );
4412                 }
4413
4414                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4415                         $parserCache = ParserCache::singleton();
4416                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4417                 }
4418
4419                 // Make sure file cache is not used on uncacheable content.
4420                 // Output that has magic words in it can still use the parser cache
4421                 // (if enabled), though it will generally expire sooner.
4422                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4423                         $wgUseFileCache = false;
4424                 }
4425
4426                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4427
4428                 return $this->mParserOutput;
4429         }
4430
4431         /**
4432          * Get parser options suitable for rendering the primary article wikitext
4433          * @return mixed ParserOptions object or boolean false
4434          */
4435         public function getParserOptions() {
4436                 global $wgUser;
4437
4438                 if ( !$this->mParserOptions ) {
4439                         $this->mParserOptions = new ParserOptions( $wgUser );
4440                         $this->mParserOptions->setTidy( true );
4441                         $this->mParserOptions->enableLimitReport();
4442                 }
4443
4444                 // Clone to allow modifications of the return value without affecting
4445                 // the cache
4446                 return clone $this->mParserOptions;
4447         }
4448
4449         /**
4450          * Updates cascading protections
4451          *
4452          * @param $parserOutput mixed ParserOptions object, or boolean false
4453          **/
4454
4455         protected function doCascadeProtectionUpdates( $parserOutput ) {
4456                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4457                         return;
4458                 }
4459
4460                 // templatelinks table may have become out of sync,
4461                 // especially if using variable-based transclusions.
4462                 // For paranoia, check if things have changed and if
4463                 // so apply updates to the database. This will ensure
4464                 // that cascaded protections apply as soon as the changes
4465                 // are visible.
4466
4467                 # Get templates from templatelinks
4468                 $id = $this->mTitle->getArticleID();
4469
4470                 $tlTemplates = array();
4471
4472                 $dbr = wfGetDB( DB_SLAVE );
4473                 $res = $dbr->select( array( 'templatelinks' ),
4474                         array( 'tl_namespace', 'tl_title' ),
4475                         array( 'tl_from' => $id ),
4476                         __METHOD__
4477                 );
4478
4479                 foreach ( $res as $row ) {
4480                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4481                 }
4482
4483                 # Get templates from parser output.
4484                 $poTemplates = array();
4485                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4486                         foreach ( $templates as $dbk => $id ) {
4487                                 $poTemplates["$ns:$dbk"] = true;
4488                         }
4489                 }
4490
4491                 # Get the diff
4492                 # Note that we simulate array_diff_key in PHP <5.0.x
4493                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4494
4495                 if ( count( $templates_diff ) > 0 ) {
4496                         # Whee, link updates time.
4497                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4498                         $u->doUpdate();
4499                 }
4500         }
4501
4502         /**
4503          * Update all the appropriate counts in the category table, given that
4504          * we've added the categories $added and deleted the categories $deleted.
4505          *
4506          * @param $added array   The names of categories that were added
4507          * @param $deleted array The names of categories that were deleted
4508          */
4509         public function updateCategoryCounts( $added, $deleted ) {
4510                 $ns = $this->mTitle->getNamespace();
4511                 $dbw = wfGetDB( DB_MASTER );
4512
4513                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4514                 # exist, we might legitimately not create it, but it's simpler to just
4515                 # create it and then give it a negative value, since the value is bogus
4516                 # anyway.
4517                 #
4518                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4519                 $insertCats = array_merge( $added, $deleted );
4520                 if ( !$insertCats ) {
4521                         # Okay, nothing to do
4522                         return;
4523                 }
4524
4525                 $insertRows = array();
4526
4527                 foreach ( $insertCats as $cat ) {
4528                         $insertRows[] = array(
4529                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4530                                 'cat_title' => $cat
4531                         );
4532                 }
4533                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4534
4535                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4536                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4537
4538                 if ( $ns == NS_CATEGORY ) {
4539                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4540                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4541                 } elseif ( $ns == NS_FILE ) {
4542                         $addFields[]    = 'cat_files = cat_files + 1';
4543                         $removeFields[] = 'cat_files = cat_files - 1';
4544                 }
4545
4546                 if ( $added ) {
4547                         $dbw->update(
4548                                 'category',
4549                                 $addFields,
4550                                 array( 'cat_title' => $added ),
4551                                 __METHOD__
4552                         );
4553                 }
4554
4555                 if ( $deleted ) {
4556                         $dbw->update(
4557                                 'category',
4558                                 $removeFields,
4559                                 array( 'cat_title' => $deleted ),
4560                                 __METHOD__
4561                         );
4562                 }
4563         }
4564
4565         /**
4566          * Lightweight method to get the parser output for a page, checking the parser cache
4567          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4568          * consider, so it's not appropriate to use there.
4569          *
4570          * @since 1.16 (r52326) for LiquidThreads
4571          *
4572          * @param $oldid mixed integer Revision ID or null
4573          */
4574         public function getParserOutput( $oldid = null ) {
4575                 global $wgEnableParserCache, $wgUser;
4576
4577                 // Should the parser cache be used?
4578                 $useParserCache = $wgEnableParserCache &&
4579                         $wgUser->getStubThreshold() == 0 &&
4580                         $this->exists() &&
4581                         $oldid === null;
4582
4583                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4584
4585                 if ( $wgUser->getStubThreshold() ) {
4586                         wfIncrStats( 'pcache_miss_stub' );
4587                 }
4588
4589                 $parserOutput = false;
4590                 if ( $useParserCache ) {
4591                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4592                 }
4593
4594                 if ( $parserOutput === false ) {
4595                         // Cache miss; parse and output it.
4596                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4597
4598                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4599                 } else {
4600                         return $parserOutput;
4601                 }
4602         }
4603
4604         // Deprecated methods
4605         /**
4606          * Get the database which should be used for reads
4607          *
4608          * @return Database
4609          * @deprecated - just call wfGetDB( DB_MASTER ) instead
4610          */
4611         function getDB() {
4612                 wfDeprecated( __METHOD__ );
4613                 return wfGetDB( DB_MASTER );
4614         }
4615
4616 }
4617
4618 class PoolWorkArticleView extends PoolCounterWork {
4619         private $mArticle;
4620
4621         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4622                 parent::__construct( __CLASS__, $key );
4623                 $this->mArticle = $article;
4624                 $this->cacheable = $useParserCache;
4625                 $this->parserOptions = $parserOptions;
4626         }
4627
4628         function doWork() {
4629                 return $this->mArticle->doViewParse();
4630         }
4631
4632         function getCachedWork() {
4633                 global $wgOut;
4634
4635                 $parserCache = ParserCache::singleton();
4636                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4637
4638                 if ( $this->mArticle->mParserOutput !== false ) {
4639                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4640                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4641                         # Ensure that UI elements requiring revision ID have
4642                         # the correct version information.
4643                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4644                         return true;
4645                 }
4646                 return false;
4647         }
4648
4649         function fallback() {
4650                 return $this->mArticle->tryDirtyCache();
4651         }
4652
4653         function error( $status ) {
4654                 global $wgOut;
4655
4656                 $wgOut->clearHTML(); // for release() errors
4657                 $wgOut->enableClientCache( false );
4658                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4659
4660                 if ( $status instanceof Status ) {
4661                         $errortext = $status->getWikiText( false, 'view-pool-error' );
4662                 } else {
4663                         $errortext = wfMsgNoTrans( 'view-pool-error', '' );
4664                 }
4665                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4666
4667                 return false;
4668         }
4669 }