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         protected $mContext;              // !< RequestContext
  21
  22         var $mContent;                    // !<
  23         var $mContentLoaded = false;      // !<
  24         var $mCounter = -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 $mOldId;                      // !<
  31         var $mPreparedEdit = false;       // !< Title object if set
  32         var $mRedirectedFrom = null;      // !< Title object if set
  33         var $mRedirectTarget = null;      // !< Title object if set
  34         var $mRedirectUrl = false;        // !<
  35         var $mRevIdFetched = 0;           // !<
  36         var $mLastRevision = null;                // !< Latest revision if set
  37         var $mRevision = null;            // !< Loaded revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mParserOptions;              // !< ParserOptions object
  43         var $mParserOutput;               // !< ParserCache object if set
  44         /**@}}*/
  45
  46         /**
  47          * Constructor and clear the article
  48          * @param $title Reference to a Title object.
  49          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  50          */
  51         public function __construct( Title $title, $oldId = null ) {
  52                 // FIXME: does the reference play any role here?
  53                 $this->mTitle =& $title;
  54                 $this->mOldId = $oldId;
  55         }
  56
  57         /**
  58          * Constructor from an page id
  59          * @param $id Int article ID to load
  60          */
  61         public static function newFromID( $id ) {
  62                 $t = Title::newFromID( $id );
  63                 # FIXME: doesn't inherit right
  64                 return $t == null ? null : new self( $t );
  65                 # return $t == null ? null : new static( $t ); // PHP 5.3
  66         }
  67
  68         /**
  69          * Tell the page view functions that this view was redirected
  70          * from another page on the wiki.
  71          * @param $from Title object.
  72          */
  73         public function setRedirectedFrom( Title $from ) {
  74                 $this->mRedirectedFrom = $from;
  75         }
  76
  77         /**
  78          * If this page is a redirect, get its target
  79          *
  80          * The target will be fetched from the redirect table if possible.
  81          * If this page doesn't have an entry there, call insertRedirect()
  82          * @return mixed Title object, or null if this page is not a redirect
  83          */
  84         public function getRedirectTarget() {
  85                 if ( !$this->mTitle->isRedirect() ) {
  86                         return null;
  87                 }
  88
  89                 if ( $this->mRedirectTarget !== null ) {
  90                         return $this->mRedirectTarget;
  91                 }
  92
  93                 # Query the redirect table
  94                 $dbr = wfGetDB( DB_SLAVE );
  95                 $row = $dbr->selectRow( 'redirect',
  96                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  97                         array( 'rd_from' => $this->getID() ),
  98                         __METHOD__
  99                 );
 100
 101                 // rd_fragment and rd_interwiki were added later, populate them if empty
 102                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 103                         return $this->mRedirectTarget = Title::makeTitle(
 104                                 $row->rd_namespace, $row->rd_title,
 105                                 $row->rd_fragment, $row->rd_interwiki );
 106                 }
 107
 108                 # This page doesn't have an entry in the redirect table
 109                 return $this->mRedirectTarget = $this->insertRedirect();
 110         }
 111
 112         /**
 113          * Insert an entry for this page into the redirect table.
 114          *
 115          * Don't call this function directly unless you know what you're doing.
 116          * @return Title object or null if not a redirect
 117          */
 118         public function insertRedirect() {
 119                 // recurse through to only get the final target
 120                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 121                 if ( !$retval ) {
 122                         return null;
 123                 }
 124                 $this->insertRedirectEntry( $retval );
 125                 return $retval;
 126         }
 127
 128         /**
 129          * Insert or update the redirect table entry for this page to indicate
 130          * it redirects to $rt .
 131          * @param $rt Title redirect target
 132          */
 133         public function insertRedirectEntry( $rt ) {
 134                 $dbw = wfGetDB( DB_MASTER );
 135                 $dbw->replace( 'redirect', array( 'rd_from' ),
 136                         array(
 137                                 'rd_from' => $this->getID(),
 138                                 'rd_namespace' => $rt->getNamespace(),
 139                                 'rd_title' => $rt->getDBkey(),
 140                                 'rd_fragment' => $rt->getFragment(),
 141                                 'rd_interwiki' => $rt->getInterwiki(),
 142                         ),
 143                         __METHOD__
 144                 );
 145         }
 146
 147         /**
 148          * Get the Title object or URL this page redirects to
 149          *
 150          * @return mixed false, Title of in-wiki target, or string with URL
 151          */
 152         public function followRedirect() {
 153                 return $this->getRedirectURL( $this->getRedirectTarget() );
 154         }
 155
 156         /**
 157          * Get the Title object this text redirects to
 158          *
 159          * @param $text string article content containing redirect info
 160          * @return mixed false, Title of in-wiki target, or string with URL
 161          * @deprecated since 1.17
 162          */
 163         public function followRedirectText( $text ) {
 164                 // recurse through to only get the final target
 165                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 166         }
 167
 168         /**
 169          * Get the Title object or URL to use for a redirect. We use Title
 170          * objects for same-wiki, non-special redirects and URLs for everything
 171          * else.
 172          * @param $rt Title Redirect target
 173          * @return mixed false, Title object of local target, or string with URL
 174          */
 175         public function getRedirectURL( $rt ) {
 176                 if ( $rt ) {
 177                         if ( $rt->getInterwiki() != '' ) {
 178                                 if ( $rt->isLocal() ) {
 179                                         // Offsite wikis need an HTTP redirect.
 180                                         //
 181                                         // This can be hard to reverse and may produce loops,
 182                                         // so they may be disabled in the site configuration.
 183                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 184                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 185                                 }
 186                         } else {
 187                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 188                                         // Gotta handle redirects to special pages differently:
 189                                         // Fill the HTTP response "Location" header and ignore
 190                                         // the rest of the page we're on.
 191                                         //
 192                                         // This can be hard to reverse, so they may be disabled.
 193                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 194                                                 // rolleyes
 195                                         } else {
 196                                                 return $rt->getFullURL();
 197                                         }
 198                                 }
 199
 200                                 return $rt;
 201                         }
 202                 }
 203
 204                 // No or invalid redirect
 205                 return false;
 206         }
 207
 208         /**
 209          * Get the title object of the article
 210          * @return Title object of this page
 211          */
 212         public function getTitle() {
 213                 return $this->mTitle;
 214         }
 215
 216         /**
 217          * Clear the object
 218          * FIXME: shouldn't this be public?
 219          * @private
 220          */
 221         public function clear() {
 222                 $this->mDataLoaded    = false;
 223                 $this->mContentLoaded = false;
 224
 225                 $this->mCounter = -1; # Not loaded
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRedirectTarget = null; # Title object if set
 228                 $this->mLastRevision = null; # Latest revision
 229                 $this->mTimestamp = '';
 230                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 231                 $this->mTouched = '19700101000000';
 232                 $this->mForUpdate = false;
 233                 $this->mIsRedirect = false;
 234                 $this->mRevIdFetched = 0;
 235                 $this->mRedirectUrl = false;
 236                 $this->mLatest = false;
 237                 $this->mPreparedEdit = false;
 238         }
 239
 240         /**
 241          * Note that getContent/loadContent do not follow redirects anymore.
 242          * If you need to fetch redirectable content easily, try
 243          * the shortcut in Article::followRedirect()
 244          *
 245          * This function has side effects! Do not use this function if you
 246          * only want the real revision text if any.
 247          *
 248          * @return Return the text of this revision
 249          */
 250         public function getContent() {
 251                 global $wgUser;
 252
 253                 wfProfileIn( __METHOD__ );
 254
 255                 if ( $this->getID() === 0 ) {
 256                         # If this is a MediaWiki:x message, then load the messages
 257                         # and return the message value for x.
 258                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 259                                 $text = $this->mTitle->getDefaultMessageText();
 260                                 if ( $text === false ) {
 261                                         $text = '';
 262                                 }
 263                         } else {
 264                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 265                         }
 266                         wfProfileOut( __METHOD__ );
 267
 268                         return $text;
 269                 } else {
 270                         $this->loadContent();
 271                         wfProfileOut( __METHOD__ );
 272
 273                         return $this->mContent;
 274                 }
 275         }
 276
 277         /**
 278          * Get the text of the current revision. No side-effects...
 279          *
 280          * @return Return the text of the current revision
 281          */
 282         public function getRawText() {
 283                 // Check process cache for current revision
 284                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 285                         return $this->mContent;
 286                 }
 287
 288                 $rev = Revision::newFromTitle( $this->mTitle );
 289                 $text = $rev ? $rev->getRawText() : false;
 290
 291                 return $text;
 292         }
 293
 294         /**
 295          * This function returns the text of a section, specified by a number ($section).
 296          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 297          * the first section before any such heading (section 0).
 298          *
 299          * If a section contains subsections, these are also returned.
 300          *
 301          * @param $text String: text to look in
 302          * @param $section Integer: section number
 303          * @return string text of the requested section
 304          * @deprecated
 305          */
 306         public function getSection( $text, $section ) {
 307                 global $wgParser;
 308                 return $wgParser->getSection( $text, $section );
 309         }
 310
 311         /**
 312          * Get the text that needs to be saved in order to undo all revisions
 313          * between $undo and $undoafter. Revisions must belong to the same page,
 314          * must exist and must not be deleted
 315          * @param $undo Revision
 316          * @param $undoafter Revision Must be an earlier revision than $undo
 317          * @return mixed string on success, false on failure
 318          */
 319         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 320                 $currentRev = Revision::newFromTitle( $this->mTitle );
 321                 if ( !$currentRev ) {
 322                         return false; // no page
 323                 }
 324                 $undo_text = $undo->getText();
 325                 $undoafter_text = $undoafter->getText();
 326                 $cur_text = $currentRev->getText();
 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                 $this->fetchContent( $this->getOldID() );
 401
 402                 wfProfileOut( __METHOD__ );
 403         }
 404
 405         /**
 406          * Return the list of revision fields that should be selected to create
 407          * a new page.
 408          */
 409         public static function selectFields() {
 410                 return array(
 411                         'page_id',
 412                         'page_namespace',
 413                         'page_title',
 414                         'page_restrictions',
 415                         'page_counter',
 416                         'page_is_redirect',
 417                         'page_is_new',
 418                         'page_random',
 419                         'page_touched',
 420                         'page_latest',
 421                         'page_len',
 422                 );
 423         }
 424
 425         /**
 426          * Fetch a page record with the given conditions
 427          * @param $dbr Database object
 428          * @param $conditions Array
 429          * @return mixed Database result resource, or false on failure
 430          */
 431         protected function pageData( $dbr, $conditions ) {
 432                 $fields = self::selectFields();
 433
 434                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 435
 436                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 437
 438                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 439
 440                 return $row;
 441         }
 442
 443         /**
 444          * Fetch a page record matching the Title object's namespace and title
 445          * using a sanitized title string
 446          *
 447          * @param $dbr Database object
 448          * @param $title Title object
 449          * @return mixed Database result resource, or false on failure
 450          */
 451         protected function pageDataFromTitle( $dbr, $title ) {
 452                 return $this->pageData( $dbr, array(
 453                         'page_namespace' => $title->getNamespace(),
 454                         'page_title'     => $title->getDBkey() ) );
 455         }
 456
 457         /**
 458          * Fetch a page record matching the requested ID
 459          *
 460          * @param $dbr Database
 461          * @param $id Integer
 462          * @return mixed Database result resource, or false on failure
 463          */
 464         protected function pageDataFromId( $dbr, $id ) {
 465                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 466         }
 467
 468         /**
 469          * Set the general counter, title etc data loaded from
 470          * some source.
 471          *
 472          * @param $data Database row object or "fromdb"
 473          */
 474         public function loadPageData( $data = 'fromdb' ) {
 475                 if ( $data === 'fromdb' ) {
 476                         $dbr = wfGetDB( DB_SLAVE );
 477                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 478                 }
 479
 480                 $lc = LinkCache::singleton();
 481
 482                 if ( $data ) {
 483                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 484
 485                         $this->mTitle->mArticleID = intval( $data->page_id );
 486
 487                         # Old-fashioned restrictions
 488                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 489
 490                         $this->mCounter     = intval( $data->page_counter );
 491                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 492                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 493                         $this->mLatest      = intval( $data->page_latest );
 494                 } else {
 495                         $lc->addBadLinkObj( $this->mTitle );
 496                         $this->mTitle->mArticleID = 0;
 497                 }
 498
 499                 $this->mDataLoaded = true;
 500         }
 501
 502         /**
 503          * Get text of an article from database
 504          * Does *NOT* follow redirects.
 505          *
 506          * @param $oldid Int: 0 for whatever the latest revision is
 507          * @return mixed string containing article contents, or false if null
 508          */
 509         function fetchContent( $oldid = 0 ) {
 510                 if ( $this->mContentLoaded ) {
 511                         return $this->mContent;
 512                 }
 513
 514                 # Pre-fill content with error message so that if something
 515                 # fails we'll have something telling us what we intended.
 516                 $t = $this->mTitle->getPrefixedText();
 517                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 518                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 519
 520                 if ( $oldid ) {
 521                         $revision = Revision::newFromId( $oldid );
 522                         if ( $revision === null ) {
 523                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 524                                 return false;
 525                         }
 526
 527                         if ( !$this->mDataLoaded || $this->getID() != $revision->getPage() ) {
 528                                 $data = $this->pageDataFromId( wfGetDB( DB_SLAVE ), $revision->getPage() );
 529
 530                                 if ( !$data ) {
 531                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 532                                         return false;
 533                                 }
 534
 535                                 $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 536                                 $this->loadPageData( $data );
 537                         }
 538                 } else {
 539                         if ( !$this->mDataLoaded ) {
 540                                 $this->loadPageData();
 541                         }
 542
 543                         if ( $this->mLatest === false ) {
 544                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 545                                 return false;
 546                         }
 547
 548                         $revision = Revision::newFromId( $this->mLatest );
 549                         if ( $revision === null ) {
 550                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 551                                 return false;
 552                         }
 553                 }
 554
 555                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 556                 // We should instead work with the Revision object when we need it...
 557                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 558
 559                 if ( $revision->getId() == $this->mLatest ) {
 560                         $this->setLastEdit( $revision );
 561                 }
 562
 563                 $this->mRevIdFetched = $revision->getId();
 564                 $this->mContentLoaded = true;
 565                 $this->mRevision =& $revision;
 566
 567                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 568
 569                 return $this->mContent;
 570         }
 571
 572         /**
 573          * Read/write accessor to select FOR UPDATE
 574          * @FIXME: remove, does nothing
 575          *
 576          * @param $x Mixed: FIXME
 577          * @return mixed value of $x, or value stored in Article::mForUpdate
 578          */
 579         public function forUpdate( $x = null ) {
 580                 wfDeprecated();
 581                 return wfSetVar( $this->mForUpdate, $x );
 582         }
 583
 584         /**
 585          * @return int Page ID
 586          */
 587         public function getID() {
 588                 return $this->mTitle->getArticleID();
 589         }
 590
 591         /**
 592          * @return bool Whether or not the page exists in the database
 593          */
 594         public function exists() {
 595                 return $this->getId() > 0;
 596         }
 597
 598         /**
 599          * Check if this page is something we're going to be showing
 600          * some sort of sensible content for. If we return false, page
 601          * views (plain action=view) will return an HTTP 404 response,
 602          * so spiders and robots can know they're following a bad link.
 603          *
 604          * @return bool
 605          */
 606         public function hasViewableContent() {
 607                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 608         }
 609
 610         /**
 611          * @return int The view count for the page
 612          */
 613         public function getCount() {
 614                 if ( -1 == $this->mCounter ) {
 615                         $id = $this->getID();
 616
 617                         if ( $id == 0 ) {
 618                                 $this->mCounter = 0;
 619                         } else {
 620                                 $dbr = wfGetDB( DB_SLAVE );
 621                                 $this->mCounter = $dbr->selectField( 'page',
 622                                         'page_counter',
 623                                         array( 'page_id' => $id ),
 624                                         __METHOD__
 625                                 );
 626                         }
 627                 }
 628
 629                 return $this->mCounter;
 630         }
 631
 632         /**
 633          * Determine whether a page would be suitable for being counted as an
 634          * article in the site_stats table based on the title & its content
 635          *
 636          * @param $text String: text to analyze
 637          * @return bool
 638          */
 639         public function isCountable( $text ) {
 640                 global $wgUseCommaCount;
 641
 642                 $token = $wgUseCommaCount ? ',' : '[[';
 643
 644                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 645         }
 646
 647         /**
 648          * Tests if the article text represents a redirect
 649          *
 650          * @param $text mixed string containing article contents, or boolean
 651          * @return bool
 652          */
 653         public function isRedirect( $text = false ) {
 654                 if ( $text === false ) {
 655                         if ( !$this->mDataLoaded ) {
 656                                 $this->loadPageData();
 657                         }
 658
 659                         return (bool)$this->mIsRedirect;
 660                 } else {
 661                         return Title::newFromRedirect( $text ) !== null;
 662                 }
 663         }
 664
 665         /**
 666          * Returns true if the currently-referenced revision is the current edit
 667          * to this page (and it exists).
 668          * @return bool
 669          */
 670         public function isCurrent() {
 671                 # If no oldid, this is the current version.
 672                 if ( $this->getOldID() == 0 ) {
 673                         return true;
 674                 }
 675
 676                 return $this->exists() && $this->mRevision && $this->mRevision->isCurrent();
 677         }
 678
 679         /**
 680          * Loads everything except the text
 681          * This isn't necessary for all uses, so it's only done if needed.
 682          */
 683         protected function loadLastEdit() {
 684                 if ( $this->mLastRevision !== null ) {
 685                         return; // already loaded
 686                 }
 687
 688                 # New or non-existent articles have no user information
 689                 $id = $this->getID();
 690                 if ( 0 == $id ) {
 691                         return;
 692                 }
 693
 694                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 695                 if ( $revision ) {
 696                         $this->setLastEdit( $revision );
 697                 }
 698         }
 699
 700         /**
 701          * Set the latest revision
 702          */
 703         protected function setLastEdit( Revision $revision ) {
 704                 $this->mLastRevision = $revision;
 705                 $this->mTimestamp = $revision->getTimestamp();
 706         }
 707
 708         /**
 709          * @return string GMT timestamp of last article revision
 710          */
 711         public function getTimestamp() {
 712                 // Check if the field has been filled by ParserCache::get()
 713                 if ( !$this->mTimestamp ) {
 714                         $this->loadLastEdit();
 715                 }
 716                 return wfTimestamp( TS_MW, $this->mTimestamp );
 717         }
 718
 719         /**
 720          * @param $audience Integer: one of:
 721          *      Revision::FOR_PUBLIC       to be displayed to all users
 722          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 723          *      Revision::RAW              get the text regardless of permissions
 724          * @return int user ID for the user that made the last article revision
 725          */
 726         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 727                 $this->loadLastEdit();
 728                 if ( $this->mLastRevision ) {
 729                         return $this->mLastRevision->getUser( $audience );
 730                 } else {
 731                         return -1;
 732                 }
 733         }
 734
 735         /**
 736          * @param $audience Integer: one of:
 737          *      Revision::FOR_PUBLIC       to be displayed to all users
 738          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 739          *      Revision::RAW              get the text regardless of permissions
 740          * @return string username of the user that made the last article revision
 741          */
 742         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 743                 $this->loadLastEdit();
 744                 if ( $this->mLastRevision ) {
 745                         return $this->mLastRevision->getUserText( $audience );
 746                 } else {
 747                         return '';
 748                 }
 749         }
 750
 751         /**
 752          * @param $audience Integer: one of:
 753          *      Revision::FOR_PUBLIC       to be displayed to all users
 754          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 755          *      Revision::RAW              get the text regardless of permissions
 756          * @return string Comment stored for the last article revision
 757          */
 758         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 759                 $this->loadLastEdit();
 760                 if ( $this->mLastRevision ) {
 761                         return $this->mLastRevision->getComment( $audience );
 762                 } else {
 763                         return '';
 764                 }
 765         }
 766
 767         /**
 768          * Returns true if last revision was marked as "minor edit"
 769          *
 770          * @return boolean Minor edit indicator for the last article revision.
 771          */
 772         public function getMinorEdit() {
 773                 $this->loadLastEdit();
 774                 if ( $this->mLastRevision ) {
 775                         return $this->mLastRevision->isMinor();
 776                 } else {
 777                         return false;
 778                 }
 779         }
 780
 781         /**
 782          * Use this to fetch the rev ID used on page views
 783          *
 784          * @return int revision ID of last article revision
 785          */
 786         public function getRevIdFetched() {
 787                 if ( $this->mRevIdFetched ) {
 788                         return $this->mRevIdFetched;
 789                 } else {
 790                         return $this->getLatest();
 791                 }
 792         }
 793
 794         /**
 795          * Get a list of users who have edited this article, not including the user who made
 796          * the most recent revision, which you can get from $article->getUser() if you want it
 797          * @return UserArray
 798          */
 799         public function getContributors() {
 800                 # FIXME: this is expensive; cache this info somewhere.
 801
 802                 $dbr = wfGetDB( DB_SLAVE );
 803                 $userTable = $dbr->tableName( 'user' );
 804
 805                 $tables = array( 'revision', 'user' );
 806
 807                 $fields = array(
 808                         "$userTable.*",
 809                         'rev_user_text AS user_name',
 810                         'MAX(rev_timestamp) AS timestamp',
 811                 );
 812
 813                 $conds = array( 'rev_page' => $this->getId() );
 814
 815                 // The user who made the top revision gets credited as "this page was last edited by
 816                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 817                 $user = $this->getUser();
 818                 if ( $user ) {
 819                         $conds[] = "rev_user != $user";
 820                 } else {
 821                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 822                 }
 823
 824                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 825
 826                 $jconds = array(
 827                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 828                 );
 829
 830                 $options = array(
 831                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 832                         'ORDER BY' => 'timestamp DESC',
 833                 );
 834
 835                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 836                 return new UserArrayFromResult( $res );
 837         }
 838
 839         /**
 840          * This is the default action of the index.php entry point: just view the
 841          * page of the given title.
 842          */
 843         public function view() {
 844                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 845                 global $wgUseFileCache, $wgUseETag;
 846
 847                 wfProfileIn( __METHOD__ );
 848
 849                 # Get variables from query string
 850                 $oldid = $this->getOldID();
 851
 852                 # getOldID may want us to redirect somewhere else
 853                 if ( $this->mRedirectUrl ) {
 854                         $wgOut->redirect( $this->mRedirectUrl );
 855                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 856                         wfProfileOut( __METHOD__ );
 857
 858                         return;
 859                 }
 860
 861                 $wgOut->setArticleFlag( true );
 862                 # Set page title (may be overridden by DISPLAYTITLE)
 863                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 864
 865                 # If we got diff in the query, we want to see a diff page instead of the article.
 866                 if ( $wgRequest->getCheck( 'diff' ) ) {
 867                         wfDebug( __METHOD__ . ": showing diff page\n" );
 868                         $this->showDiffPage();
 869                         wfProfileOut( __METHOD__ );
 870
 871                         return;
 872                 }
 873
 874                 # Allow frames by default
 875                 $wgOut->allowClickjacking();
 876
 877                 $parserCache = ParserCache::singleton();
 878
 879                 $parserOptions = $this->getParserOptions();
 880                 # Render printable version, use printable version cache
 881                 if ( $wgOut->isPrintable() ) {
 882                         $parserOptions->setIsPrintable( true );
 883                         $parserOptions->setEditSection( false );
 884                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 885                         $parserOptions->setEditSection( false );
 886                 }
 887
 888                 # Try client and file cache
 889                 if ( $oldid === 0 && $this->checkTouched() ) {
 890                         if ( $wgUseETag ) {
 891                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 892                         }
 893
 894                         # Is it client cached?
 895                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 896                                 wfDebug( __METHOD__ . ": done 304\n" );
 897                                 wfProfileOut( __METHOD__ );
 898
 899                                 return;
 900                         # Try file cache
 901                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 902                                 wfDebug( __METHOD__ . ": done file cache\n" );
 903                                 # tell wgOut that output is taken care of
 904                                 $wgOut->disable();
 905                                 $this->viewUpdates();
 906                                 wfProfileOut( __METHOD__ );
 907
 908                                 return;
 909                         }
 910                 }
 911
 912                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 913                         $parserOptions->setEditSection( false );
 914                 }
 915
 916                 # Should the parser cache be used?
 917                 $useParserCache = $this->useParserCache( $oldid );
 918                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 919                 if ( $wgUser->getStubThreshold() ) {
 920                         wfIncrStats( 'pcache_miss_stub' );
 921                 }
 922
 923                 $wasRedirected = $this->showRedirectedFromHeader();
 924                 $this->showNamespaceHeader();
 925
 926                 # Iterate through the possible ways of constructing the output text.
 927                 # Keep going until $outputDone is set, or we run out of things to do.
 928                 $pass = 0;
 929                 $outputDone = false;
 930                 $this->mParserOutput = false;
 931
 932                 while ( !$outputDone && ++$pass ) {
 933                         switch( $pass ) {
 934                                 case 1:
 935                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 936                                         break;
 937                                 case 2:
 938                                         # Try the parser cache
 939                                         if ( $useParserCache ) {
 940                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 941
 942                                                 if ( $this->mParserOutput !== false ) {
 943                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 944                                                         $wgOut->addParserOutput( $this->mParserOutput );
 945                                                         # Ensure that UI elements requiring revision ID have
 946                                                         # the correct version information.
 947                                                         $wgOut->setRevisionId( $this->mLatest );
 948                                                         $outputDone = true;
 949                                                 }
 950                                         }
 951                                         break;
 952                                 case 3:
 953                                         $text = $this->getContent();
 954                                         if ( $text === false || $this->getID() == 0 ) {
 955                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 956                                                 $this->showMissingArticle();
 957                                                 wfProfileOut( __METHOD__ );
 958                                                 return;
 959                                         }
 960
 961                                         # Another whitelist check in case oldid is altering the title
 962                                         if ( !$this->mTitle->userCanRead() ) {
 963                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 964                                                 $wgOut->loginToUse();
 965                                                 $wgOut->output();
 966                                                 $wgOut->disable();
 967                                                 wfProfileOut( __METHOD__ );
 968                                                 return;
 969                                         }
 970
 971                                         # Are we looking at an old revision
 972                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 973                                                 $this->setOldSubtitle( $oldid );
 974
 975                                                 if ( !$this->showDeletedRevisionHeader() ) {
 976                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 977                                                         wfProfileOut( __METHOD__ );
 978                                                         return;
 979                                                 }
 980
 981                                                 # If this "old" version is the current, then try the parser cache...
 982                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 983                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 984                                                         if ( $this->mParserOutput ) {
 985                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 986                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 987                                                                 $wgOut->setRevisionId( $this->mLatest );
 988                                                                 $outputDone = true;
 989                                                                 break;
 990                                                         }
 991                                                 }
 992                                         }
 993
 994                                         # Ensure that UI elements requiring revision ID have
 995                                         # the correct version information.
 996                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 997
 998                                         # Pages containing custom CSS or JavaScript get special treatment
 999                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
1000                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
1001                                                 $this->showCssOrJsPage();
1002                                                 $outputDone = true;
1003                                         } else {
1004                                                 $rt = Title::newFromRedirectArray( $text );
1005                                                 if ( $rt ) {
1006                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
1007                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
1008                                                         # Don't append the subtitle if this was an old revision
1009                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
1010                                                         # Parse just to get categories, displaytitle, etc.
1011                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
1012                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
1013                                                         $outputDone = true;
1014                                                 }
1015                                         }
1016                                         break;
1017                                 case 4:
1018                                         # Run the parse, protected by a pool counter
1019                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1020
1021                                         $key = $parserCache->getKey( $this, $parserOptions );
1022                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1023
1024                                         if ( !$poolArticleView->execute() ) {
1025                                                 # Connection or timeout error
1026                                                 wfProfileOut( __METHOD__ );
1027                                                 return;
1028                                         } else {
1029                                                 $outputDone = true;
1030                                         }
1031                                         break;
1032                                 # Should be unreachable, but just in case...
1033                                 default:
1034                                         break 2;
1035                         }
1036                 }
1037
1038                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1039                 if ( $this->mParserOutput ) {
1040                         $titleText = $this->mParserOutput->getTitleText();
1041
1042                         if ( strval( $titleText ) !== '' ) {
1043                                 $wgOut->setPageTitle( $titleText );
1044                         }
1045                 }
1046
1047                 # For the main page, overwrite the <title> element with the con-
1048                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1049                 # that's not empty).
1050                 # This message always exists because it is in the i18n files
1051                 if ( $this->mTitle->equals( Title::newMainPage() ) ) {
1052                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
1053                         if ( !$msg->isDisabled() ) {
1054                                 $wgOut->setHTMLTitle( $msg->title( $this->mTitle )->text() );
1055                         }
1056                 }
1057
1058                 # Now that we've filled $this->mParserOutput, we know whether
1059                 # there are any __NOINDEX__ tags on the page
1060                 $policy = $this->getRobotPolicy( 'view' );
1061                 $wgOut->setIndexPolicy( $policy['index'] );
1062                 $wgOut->setFollowPolicy( $policy['follow'] );
1063
1064                 $this->showViewFooter();
1065                 $this->viewUpdates();
1066                 wfProfileOut( __METHOD__ );
1067         }
1068
1069         /**
1070          * Show a diff page according to current request variables. For use within
1071          * Article::view() only, other callers should use the DifferenceEngine class.
1072          */
1073         public function showDiffPage() {
1074                 global $wgRequest, $wgUser;
1075
1076                 $diff = $wgRequest->getVal( 'diff' );
1077                 $rcid = $wgRequest->getVal( 'rcid' );
1078                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1079                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1080                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1081                 $oldid = $this->getOldID();
1082
1083                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1084                 // DifferenceEngine directly fetched the revision:
1085                 $this->mRevIdFetched = $de->mNewid;
1086                 $de->showDiffPage( $diffOnly );
1087
1088                 if ( $diff == 0 || $diff == $this->getLatest() ) {
1089                         # Run view updates for current revision only
1090                         $this->viewUpdates();
1091                 }
1092         }
1093
1094         /**
1095          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1096          * Article::view() only.
1097          *
1098          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1099          * page views.
1100          */
1101         protected function showCssOrJsPage() {
1102                 global $wgOut;
1103
1104                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1105
1106                 // Give hooks a chance to customise the output
1107                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1108                         // Wrap the whole lot in a <pre> and don't parse
1109                         $m = array();
1110                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1111                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1112                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1113                         $wgOut->addHTML( "\n</pre>\n" );
1114                 }
1115         }
1116
1117         /**
1118          * Get the robot policy to be used for the current view
1119          * @param $action String the action= GET parameter
1120          * @return Array the policy that should be set
1121          * TODO: actions other than 'view'
1122          */
1123         public function getRobotPolicy( $action ) {
1124                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1125                 global $wgDefaultRobotPolicy, $wgRequest;
1126
1127                 $ns = $this->mTitle->getNamespace();
1128
1129                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1130                         # Don't index user and user talk pages for blocked users (bug 11443)
1131                         if ( !$this->mTitle->isSubpage() ) {
1132                                 if ( Block::newFromTarget( null, $this->mTitle->getText() ) instanceof Block ) {
1133                                         return array(
1134                                                 'index'  => 'noindex',
1135                                                 'follow' => 'nofollow'
1136                                         );
1137                                 }
1138                         }
1139                 }
1140
1141                 if ( $this->getID() === 0 || $this->getOldID() ) {
1142                         # Non-articles (special pages etc), and old revisions
1143                         return array(
1144                                 'index'  => 'noindex',
1145                                 'follow' => 'nofollow'
1146                         );
1147                 } elseif ( $wgOut->isPrintable() ) {
1148                         # Discourage indexing of printable versions, but encourage following
1149                         return array(
1150                                 'index'  => 'noindex',
1151                                 'follow' => 'follow'
1152                         );
1153                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1154                         # For ?curid=x urls, disallow indexing
1155                         return array(
1156                                 'index'  => 'noindex',
1157                                 'follow' => 'follow'
1158                         );
1159                 }
1160
1161                 # Otherwise, construct the policy based on the various config variables.
1162                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1163
1164                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1165                         # Honour customised robot policies for this namespace
1166                         $policy = array_merge(
1167                                 $policy,
1168                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1169                         );
1170                 }
1171                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1172                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1173                         # a final sanity check that we have really got the parser output.
1174                         $policy = array_merge(
1175                                 $policy,
1176                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1177                         );
1178                 }
1179
1180                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1181                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1182                         $policy = array_merge(
1183                                 $policy,
1184                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1185                         );
1186                 }
1187
1188                 return $policy;
1189         }
1190
1191         /**
1192          * Converts a String robot policy into an associative array, to allow
1193          * merging of several policies using array_merge().
1194          * @param $policy Mixed, returns empty array on null/false/'', transparent
1195          *            to already-converted arrays, converts String.
1196          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1197          */
1198         public static function formatRobotPolicy( $policy ) {
1199                 if ( is_array( $policy ) ) {
1200                         return $policy;
1201                 } elseif ( !$policy ) {
1202                         return array();
1203                 }
1204
1205                 $policy = explode( ',', $policy );
1206                 $policy = array_map( 'trim', $policy );
1207
1208                 $arr = array();
1209                 foreach ( $policy as $var ) {
1210                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1211                                 $arr['index'] = $var;
1212                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1213                                 $arr['follow'] = $var;
1214                         }
1215                 }
1216
1217                 return $arr;
1218         }
1219
1220         /**
1221          * If this request is a redirect view, send "redirected from" subtitle to
1222          * $wgOut. Returns true if the header was needed, false if this is not a
1223          * redirect view. Handles both local and remote redirects.
1224          *
1225          * @return boolean
1226          */
1227         public function showRedirectedFromHeader() {
1228                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1229
1230                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1231
1232                 if ( isset( $this->mRedirectedFrom ) ) {
1233                         // This is an internally redirected page view.
1234                         // We'll need a backlink to the source page for navigation.
1235                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1236                                 $redir = $wgUser->getSkin()->link(
1237                                         $this->mRedirectedFrom,
1238                                         null,
1239                                         array(),
1240                                         array( 'redirect' => 'no' ),
1241                                         array( 'known', 'noclasses' )
1242                                 );
1243
1244                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1245                                 $wgOut->setSubtitle( $s );
1246
1247                                 // Set the fragment if one was specified in the redirect
1248                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1249                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1250                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1251                                 }
1252
1253                                 // Add a <link rel="canonical"> tag
1254                                 $wgOut->addLink( array( 'rel' => 'canonical',
1255                                         'href' => $this->mTitle->getLocalURL() )
1256                                 );
1257
1258                                 return true;
1259                         }
1260                 } elseif ( $rdfrom ) {
1261                         // This is an externally redirected view, from some other wiki.
1262                         // If it was reported from a trusted site, supply a backlink.
1263                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1264                                 $redir = $wgUser->getSkin()->makeExternalLink( $rdfrom, $rdfrom );
1265                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1266                                 $wgOut->setSubtitle( $s );
1267
1268                                 return true;
1269                         }
1270                 }
1271
1272                 return false;
1273         }
1274
1275         /**
1276          * Show a header specific to the namespace currently being viewed, like
1277          * [[MediaWiki:Talkpagetext]]. For Article::view().
1278          */
1279         public function showNamespaceHeader() {
1280                 global $wgOut;
1281
1282                 if ( $this->mTitle->isTalkPage() ) {
1283                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1284                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1285                         }
1286                 }
1287         }
1288
1289         /**
1290          * Show the footer section of an ordinary page view
1291          */
1292         public function showViewFooter() {
1293                 global $wgOut, $wgUseTrackbacks;
1294
1295                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1296                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1297                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1298                 }
1299
1300                 # If we have been passed an &rcid= parameter, we want to give the user a
1301                 # chance to mark this new article as patrolled.
1302                 $this->showPatrolFooter();
1303
1304                 # Trackbacks
1305                 if ( $wgUseTrackbacks ) {
1306                         $this->addTrackbacks();
1307                 }
1308
1309                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1310
1311         }
1312
1313         /**
1314          * If patrol is possible, output a patrol UI box. This is called from the
1315          * footer section of ordinary page views. If patrol is not possible or not
1316          * desired, does nothing.
1317          */
1318         public function showPatrolFooter() {
1319                 global $wgOut, $wgRequest, $wgUser;
1320
1321                 $rcid = $wgRequest->getVal( 'rcid' );
1322
1323                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1324                         return;
1325                 }
1326
1327                 $sk = $wgUser->getSkin();
1328                 $token = $wgUser->editToken( $rcid );
1329                 $wgOut->preventClickjacking();
1330
1331                 $wgOut->addHTML(
1332                         "<div class='patrollink'>" .
1333                                 wfMsgHtml(
1334                                         'markaspatrolledlink',
1335                                         $sk->link(
1336                                                 $this->mTitle,
1337                                                 wfMsgHtml( 'markaspatrolledtext' ),
1338                                                 array(),
1339                                                 array(
1340                                                         'action' => 'markpatrolled',
1341                                                         'rcid' => $rcid,
1342                                                         'token' => $token,
1343                                                 ),
1344                                                 array( 'known', 'noclasses' )
1345                                         )
1346                                 ) .
1347                         '</div>'
1348                 );
1349         }
1350
1351         /**
1352          * Show the error text for a missing article. For articles in the MediaWiki
1353          * namespace, show the default message text. To be called from Article::view().
1354          */
1355         public function showMissingArticle() {
1356                 global $wgOut, $wgRequest, $wgUser;
1357
1358                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1359                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1360                         $parts = explode( '/', $this->mTitle->getText() );
1361                         $rootPart = $parts[0];
1362                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1363                         $ip = User::isIP( $rootPart );
1364
1365                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1366                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1367                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1368                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1369                                 LogEventsList::showLogExtract(
1370                                         $wgOut,
1371                                         'block',
1372                                         $user->getUserPage()->getPrefixedText(),
1373                                         '',
1374                                         array(
1375                                                 'lim' => 1,
1376                                                 'showIfEmpty' => false,
1377                                                 'msgKey' => array(
1378                                                         'blocked-notice-logextract',
1379                                                         $user->getName() # Support GENDER in notice
1380                                                 )
1381                                         )
1382                                 );
1383                         }
1384                 }
1385
1386                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1387
1388                 # Show delete and move logs
1389                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1390                         array(  'lim' => 10,
1391                                 'conds' => array( "log_action != 'revision'" ),
1392                                 'showIfEmpty' => false,
1393                                 'msgKey' => array( 'moveddeleted-notice' ) )
1394                 );
1395
1396                 # Show error message
1397                 $oldid = $this->getOldID();
1398                 if ( $oldid ) {
1399                         $text = wfMsgNoTrans( 'missing-article',
1400                                 $this->mTitle->getPrefixedText(),
1401                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1402                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1403                         // Use the default message text
1404                         $text = $this->mTitle->getDefaultMessageText();
1405                 } else {
1406                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1407                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1408                         $errors = array_merge( $createErrors, $editErrors );
1409
1410                         if ( !count( $errors ) ) {
1411                                 $text = wfMsgNoTrans( 'noarticletext' );
1412                         } else {
1413                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1414                         }
1415                 }
1416                 $text = "<div class='noarticletext'>\n$text\n</div>";
1417
1418                 if ( !$this->hasViewableContent() ) {
1419                         // If there's no backing content, send a 404 Not Found
1420                         // for better machine handling of broken links.
1421                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
1422                 }
1423
1424                 $wgOut->addWikiText( $text );
1425         }
1426
1427         /**
1428          * If the revision requested for view is deleted, check permissions.
1429          * Send either an error message or a warning header to $wgOut.
1430          *
1431          * @return boolean true if the view is allowed, false if not.
1432          */
1433         public function showDeletedRevisionHeader() {
1434                 global $wgOut, $wgRequest;
1435
1436                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1437                         // Not deleted
1438                         return true;
1439                 }
1440
1441                 // If the user is not allowed to see it...
1442                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1443                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1444                                 'rev-deleted-text-permission' );
1445
1446                         return false;
1447                 // If the user needs to confirm that they want to see it...
1448                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1449                         # Give explanation and add a link to view the revision...
1450                         $oldid = intval( $this->getOldID() );
1451                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1452                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1453                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1454                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1455                                 array( $msg, $link ) );
1456
1457                         return false;
1458                 // We are allowed to see...
1459                 } else {
1460                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1461                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1462                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1463
1464                         return true;
1465                 }
1466         }
1467
1468         /**
1469          * Should the parser cache be used?
1470          *
1471          * @return boolean
1472          */
1473         public function useParserCache( $oldid ) {
1474                 global $wgUser, $wgEnableParserCache;
1475
1476                 return $wgEnableParserCache
1477                         && $wgUser->getStubThreshold() == 0
1478                         && $this->exists()
1479                         && empty( $oldid )
1480                         && !$this->mTitle->isCssOrJsPage()
1481                         && !$this->mTitle->isCssJsSubpage();
1482         }
1483
1484         /**
1485          * Execute the uncached parse for action=view
1486          */
1487         public function doViewParse() {
1488                 global $wgOut;
1489
1490                 $oldid = $this->getOldID();
1491                 $parserOptions = $this->getParserOptions();
1492
1493                 # Render printable version, use printable version cache
1494                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1495
1496                 # Don't show section-edit links on old revisions... this way lies madness.
1497                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1498                         $parserOptions->setEditSection( false );
1499                 }
1500
1501                 $useParserCache = $this->useParserCache( $oldid );
1502                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1503
1504                 return true;
1505         }
1506
1507         /**
1508          * Try to fetch an expired entry from the parser cache. If it is present,
1509          * output it and return true. If it is not present, output nothing and
1510          * return false. This is used as a callback function for
1511          * PoolCounter::executeProtected().
1512          *
1513          * @return boolean
1514          */
1515         public function tryDirtyCache() {
1516                 global $wgOut;
1517                 $parserCache = ParserCache::singleton();
1518                 $options = $this->getParserOptions();
1519
1520                 if ( $wgOut->isPrintable() ) {
1521                         $options->setIsPrintable( true );
1522                         $options->setEditSection( false );
1523                 }
1524
1525                 $output = $parserCache->getDirty( $this, $options );
1526
1527                 if ( $output ) {
1528                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1529                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1530                         $wgOut->setSquidMaxage( 0 );
1531                         $this->mParserOutput = $output;
1532                         $wgOut->addParserOutput( $output );
1533                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1534
1535                         return true;
1536                 } else {
1537                         wfDebugLog( 'dirty', "dirty missing\n" );
1538                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1539
1540                         return false;
1541                 }
1542         }
1543
1544         /**
1545          * View redirect
1546          *
1547          * @param $target Title|Array of destination(s) to redirect
1548          * @param $appendSubtitle Boolean [optional]
1549          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1550          * @return string containing HMTL with redirect link
1551          */
1552         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1553                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1554
1555                 if ( !is_array( $target ) ) {
1556                         $target = array( $target );
1557                 }
1558
1559                 $imageDir = $wgContLang->getDir();
1560
1561                 if ( $appendSubtitle ) {
1562                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1563                 }
1564
1565                 $sk = $wgUser->getSkin();
1566                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1567                 $title = array_shift( $target );
1568
1569                 if ( $forceKnown ) {
1570                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1571                 } else {
1572                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1573                 }
1574
1575                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1576                 $alt = $wgContLang->isRTL() ? '←' : '→';
1577                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1578                 foreach ( $target as $rt ) {
1579                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1580                         if ( $forceKnown ) {
1581                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1582                         } else {
1583                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1584                         }
1585                 }
1586
1587                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1588                 return '<div class="redirectMsg">' .
1589                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1590                         '<span class="redirectText">' . $link . '</span></div>';
1591         }
1592
1593         /**
1594          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1595          */
1596         public function addTrackbacks() {
1597                 global $wgOut;
1598
1599                 $dbr = wfGetDB( DB_SLAVE );
1600                 $tbs = $dbr->select( 'trackbacks',
1601                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1602                         array( 'tb_page' => $this->getID() )
1603                 );
1604
1605                 if ( !$dbr->numRows( $tbs ) ) {
1606                         return;
1607                 }
1608
1609                 $wgOut->preventClickjacking();
1610
1611                 $tbtext = "";
1612                 foreach ( $tbs as $o ) {
1613                         $rmvtxt = "";
1614
1615                         if ( $wgOut->getUser()->isAllowed( 'trackback' ) ) {
1616                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1617                                         $o->tb_id . "&token=" . urlencode( $wgOut->getUser()->editToken() ) );
1618                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1619                         }
1620
1621                         $tbtext .= "\n";
1622                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1623                                         $o->tb_title,
1624                                         $o->tb_url,
1625                                         $o->tb_ex,
1626                                         $o->tb_name,
1627                                         $rmvtxt );
1628                 }
1629
1630                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1631         }
1632
1633         /**
1634          * Removes trackback record for current article from trackbacks table
1635          */
1636         public function deletetrackback() {
1637                 global $wgRequest, $wgOut;
1638
1639                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1640                         $wgOut->addWikiMsg( 'sessionfailure' );
1641
1642                         return;
1643                 }
1644
1645                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
1646
1647                 if ( count( $permission_errors ) ) {
1648                         $wgOut->showPermissionsErrorPage( $permission_errors );
1649
1650                         return;
1651                 }
1652
1653                 $db = wfGetDB( DB_MASTER );
1654                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1655
1656                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1657                 $this->mTitle->invalidateCache();
1658         }
1659
1660         /**
1661          * Handle action=render
1662          */
1663
1664         public function render() {
1665                 global $wgOut;
1666
1667                 $wgOut->setArticleBodyOnly( true );
1668                 $this->view();
1669         }
1670
1671         /**
1672          * Handle action=purge
1673          */
1674         public function purge() {
1675                 global $wgRequest, $wgOut;
1676
1677                 if ( $wgOut->getUser()->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1678                         //FIXME: shouldn't this be in doPurge()?
1679                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1680                                 $this->doPurge();
1681                                 $this->view();
1682                         }
1683                 } else {
1684                         $formParams = array(
1685                                 'method' => 'post',
1686                                 'action' =>  $wgRequest->getRequestURL(),
1687                         );
1688
1689                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1690
1691                         $form  = Html::openElement( 'form', $formParams );
1692                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1693                         $form .= Html::closeElement( 'form' );
1694
1695                         $wgOut->addHTML( $form );
1696                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1697
1698                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1699                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1700                 }
1701         }
1702
1703         /**
1704          * Perform the actions of a page purging
1705          */
1706         public function doPurge() {
1707                 global $wgUseSquid;
1708
1709                 // Invalidate the cache
1710                 $this->mTitle->invalidateCache();
1711                 $this->clear();
1712
1713                 if ( $wgUseSquid ) {
1714                         // Commit the transaction before the purge is sent
1715                         $dbw = wfGetDB( DB_MASTER );
1716                         $dbw->commit();
1717
1718                         // Send purge
1719                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1720                         $update->doUpdate();
1721                 }
1722
1723                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1724                         if ( $this->getID() == 0 ) {
1725                                 $text = false;
1726                         } else {
1727                                 $text = $this->getRawText();
1728                         }
1729
1730                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1731                 }
1732         }
1733
1734         /**
1735          * Insert a new empty page record for this article.
1736          * This *must* be followed up by creating a revision
1737          * and running $this->updateRevisionOn( ... );
1738          * or else the record will be left in a funky state.
1739          * Best if all done inside a transaction.
1740          *
1741          * @param $dbw Database
1742          * @return int The newly created page_id key, or false if the title already existed
1743          * @private
1744          */
1745         public function insertOn( $dbw ) {
1746                 wfProfileIn( __METHOD__ );
1747
1748                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1749                 $dbw->insert( 'page', array(
1750                         'page_id'           => $page_id,
1751                         'page_namespace'    => $this->mTitle->getNamespace(),
1752                         'page_title'        => $this->mTitle->getDBkey(),
1753                         'page_counter'      => 0,
1754                         'page_restrictions' => '',
1755                         'page_is_redirect'  => 0, # Will set this shortly...
1756                         'page_is_new'       => 1,
1757                         'page_random'       => wfRandom(),
1758                         'page_touched'      => $dbw->timestamp(),
1759                         'page_latest'       => 0, # Fill this in shortly...
1760                         'page_len'          => 0, # Fill this in shortly...
1761                 ), __METHOD__, 'IGNORE' );
1762
1763                 $affected = $dbw->affectedRows();
1764
1765                 if ( $affected ) {
1766                         $newid = $dbw->insertId();
1767                         $this->mTitle->resetArticleID( $newid );
1768                 }
1769                 wfProfileOut( __METHOD__ );
1770
1771                 return $affected ? $newid : false;
1772         }
1773
1774         /**
1775          * Update the page record to point to a newly saved revision.
1776          *
1777          * @param $dbw DatabaseBase: object
1778          * @param $revision Revision: For ID number, and text used to set
1779                                                 length and redirect status fields
1780          * @param $lastRevision Integer: if given, will not overwrite the page field
1781          *                      when different from the currently set value.
1782          *                      Giving 0 indicates the new page flag should be set
1783          *                      on.
1784          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1785          *                           removing rows in redirect table.
1786          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1787          *                    Needed when $lastRevision has to be set to sth. !=0
1788          * @return bool true on success, false on failure
1789          * @private
1790          */
1791         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1792                 wfProfileIn( __METHOD__ );
1793
1794                 $text = $revision->getText();
1795                 $rt = Title::newFromRedirectRecurse( $text );
1796
1797                 $conditions = array( 'page_id' => $this->getId() );
1798
1799                 if ( !is_null( $lastRevision ) ) {
1800                         # An extra check against threads stepping on each other
1801                         $conditions['page_latest'] = $lastRevision;
1802                 }
1803
1804                 if ( !$setNewFlag ) {
1805                         $setNewFlag = ( $lastRevision === 0 );
1806                 }
1807
1808                 $dbw->update( 'page',
1809                         array( /* SET */
1810                                 'page_latest'      => $revision->getId(),
1811                                 'page_touched'     => $dbw->timestamp(),
1812                                 'page_is_new'      => $setNewFlag,
1813                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1814                                 'page_len'         => strlen( $text ),
1815                         ),
1816                         $conditions,
1817                         __METHOD__ );
1818
1819                 $result = $dbw->affectedRows() != 0;
1820                 if ( $result ) {
1821                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1822                 }
1823
1824                 wfProfileOut( __METHOD__ );
1825                 return $result;
1826         }
1827
1828         /**
1829          * Add row to the redirect table if this is a redirect, remove otherwise.
1830          *
1831          * @param $dbw Database
1832          * @param $redirectTitle Title object pointing to the redirect target,
1833          *                       or NULL if this is not a redirect
1834          * @param $lastRevIsRedirect If given, will optimize adding and
1835          *                           removing rows in redirect table.
1836          * @return bool true on success, false on failure
1837          * @private
1838          */
1839         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1840                 // Always update redirects (target link might have changed)
1841                 // Update/Insert if we don't know if the last revision was a redirect or not
1842                 // Delete if changing from redirect to non-redirect
1843                 $isRedirect = !is_null( $redirectTitle );
1844
1845                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1846                         return true;
1847                 }
1848
1849                 wfProfileIn( __METHOD__ );
1850                 if ( $isRedirect ) {
1851                         $this->insertRedirectEntry( $redirectTitle );
1852                 } else {
1853                         // This is not a redirect, remove row from redirect table
1854                         $where = array( 'rd_from' => $this->getId() );
1855                         $dbw->delete( 'redirect', $where, __METHOD__ );
1856                 }
1857
1858                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1859                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1860                 }
1861                 wfProfileOut( __METHOD__ );
1862
1863                 return ( $dbw->affectedRows() != 0 );
1864         }
1865
1866         /**
1867          * If the given revision is newer than the currently set page_latest,
1868          * update the page record. Otherwise, do nothing.
1869          *
1870          * @param $dbw Database object
1871          * @param $revision Revision object
1872          * @return mixed
1873          */
1874         public function updateIfNewerOn( &$dbw, $revision ) {
1875                 wfProfileIn( __METHOD__ );
1876
1877                 $row = $dbw->selectRow(
1878                         array( 'revision', 'page' ),
1879                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1880                         array(
1881                                 'page_id' => $this->getId(),
1882                                 'page_latest=rev_id' ),
1883                         __METHOD__ );
1884
1885                 if ( $row ) {
1886                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1887                                 wfProfileOut( __METHOD__ );
1888                                 return false;
1889                         }
1890                         $prev = $row->rev_id;
1891                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1892                 } else {
1893                         # No or missing previous revision; mark the page as new
1894                         $prev = 0;
1895                         $lastRevIsRedirect = null;
1896                 }
1897
1898                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1899
1900                 wfProfileOut( __METHOD__ );
1901                 return $ret;
1902         }
1903
1904         /**
1905          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1906          * @param $text String: new text of the section
1907          * @param $summary String: new section's subject, only if $section is 'new'
1908          * @param $edittime String: revision timestamp or null to use the current revision
1909          * @return string Complete article text, or null if error
1910          */
1911         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1912                 wfProfileIn( __METHOD__ );
1913
1914                 if ( strval( $section ) == '' ) {
1915                         // Whole-page edit; let the whole text through
1916                 } else {
1917                         if ( is_null( $edittime ) ) {
1918                                 $rev = Revision::newFromTitle( $this->mTitle );
1919                         } else {
1920                                 $dbw = wfGetDB( DB_MASTER );
1921                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1922                         }
1923
1924                         if ( !$rev ) {
1925                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1926                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1927                                 wfProfileOut( __METHOD__ );
1928                                 return null;
1929                         }
1930
1931                         $oldtext = $rev->getText();
1932
1933                         if ( $section == 'new' ) {
1934                                 # Inserting a new section
1935                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1936                                 $text = strlen( trim( $oldtext ) ) > 0
1937                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1938                                                 : "{$subject}{$text}";
1939                         } else {
1940                                 # Replacing an existing section; roll out the big guns
1941                                 global $wgParser;
1942
1943                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1944                         }
1945                 }
1946
1947                 wfProfileOut( __METHOD__ );
1948                 return $text;
1949         }
1950
1951         /**
1952          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1953          * @param $flags Int
1954          * @return Int updated $flags
1955          */
1956         function checkFlags( $flags ) {
1957                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1958                         if ( $this->mTitle->getArticleID() ) {
1959                                 $flags |= EDIT_UPDATE;
1960                         } else {
1961                                 $flags |= EDIT_NEW;
1962                         }
1963                 }
1964
1965                 return $flags;
1966         }
1967
1968         /**
1969          * Article::doEdit()
1970          *
1971          * Change an existing article or create a new article. Updates RC and all necessary caches,
1972          * optionally via the deferred update array.
1973          *
1974          * $wgUser must be set before calling this function.
1975          *
1976          * @param $text String: new text
1977          * @param $summary String: edit summary
1978          * @param $flags Integer bitfield:
1979          *      EDIT_NEW
1980          *          Article is known or assumed to be non-existent, create a new one
1981          *      EDIT_UPDATE
1982          *          Article is known or assumed to be pre-existing, update it
1983          *      EDIT_MINOR
1984          *          Mark this edit minor, if the user is allowed to do so
1985          *      EDIT_SUPPRESS_RC
1986          *          Do not log the change in recentchanges
1987          *      EDIT_FORCE_BOT
1988          *          Mark the edit a "bot" edit regardless of user rights
1989          *      EDIT_DEFER_UPDATES
1990          *          Defer some of the updates until the end of index.php
1991          *      EDIT_AUTOSUMMARY
1992          *          Fill in blank summaries with generated text where possible
1993          *
1994          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1995          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1996          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1997          * edit-already-exists error will be returned. These two conditions are also possible with
1998          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1999          *
2000          * @param $baseRevId the revision ID this edit was based off, if any
2001          * @param $user User (optional), $wgUser will be used if not passed
2002          *
2003          * @return Status object. Possible errors:
2004          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2005          *     edit-gone-missing:       In update mode, but the article didn't exist
2006          *     edit-conflict:           In update mode, the article changed unexpectedly
2007          *     edit-no-change:          Warning that the text was the same as before
2008          *     edit-already-exists:     In creation mode, but the article already exists
2009          *
2010          *  Extensions may define additional errors.
2011          *
2012          *  $return->value will contain an associative array with members as follows:
2013          *     new:                     Boolean indicating if the function attempted to create a new article
2014          *     revision:                The revision object for the inserted revision, or null
2015          *
2016          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2017          */
2018         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2019                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2020
2021                 # Low-level sanity check
2022                 if ( $this->mTitle->getText() === '' ) {
2023                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2024                 }
2025
2026                 wfProfileIn( __METHOD__ );
2027
2028                 $user = is_null( $user ) ? $wgUser : $user;
2029                 $status = Status::newGood( array() );
2030
2031                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2032                 $this->loadPageData();
2033
2034                 $flags = $this->checkFlags( $flags );
2035
2036                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2037                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2038                 {
2039                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2040
2041                         if ( $status->isOK() ) {
2042                                 $status->fatal( 'edit-hook-aborted' );
2043                         }
2044
2045                         wfProfileOut( __METHOD__ );
2046                         return $status;
2047                 }
2048
2049                 # Silently ignore EDIT_MINOR if not allowed
2050                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2051                 $bot = $flags & EDIT_FORCE_BOT;
2052
2053                 $oldtext = $this->getRawText(); // current revision
2054                 $oldsize = strlen( $oldtext );
2055
2056                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2057                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2058                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2059                 }
2060
2061                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
2062                 $text = $editInfo->pst;
2063                 $newsize = strlen( $text );
2064
2065                 $dbw = wfGetDB( DB_MASTER );
2066                 $now = wfTimestampNow();
2067                 $this->mTimestamp = $now;
2068
2069                 if ( $flags & EDIT_UPDATE ) {
2070                         # Update article, but only if changed.
2071                         $status->value['new'] = false;
2072
2073                         # Make sure the revision is either completely inserted or not inserted at all
2074                         if ( !$wgDBtransactions ) {
2075                                 $userAbort = ignore_user_abort( true );
2076                         }
2077
2078                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2079
2080                         if ( $changed ) {
2081                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2082                                   - (int)$this->isCountable( $oldtext );
2083                                 $this->mTotalAdjustment = 0;
2084
2085                                 if ( !$this->mLatest ) {
2086                                         # Article gone missing
2087                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2088                                         $status->fatal( 'edit-gone-missing' );
2089
2090                                         wfProfileOut( __METHOD__ );
2091                                         return $status;
2092                                 }
2093
2094                                 $revision = new Revision( array(
2095                                         'page'       => $this->getId(),
2096                                         'comment'    => $summary,
2097                                         'minor_edit' => $isminor,
2098                                         'text'       => $text,
2099                                         'parent_id'  => $this->mLatest,
2100                                         'user'       => $user->getId(),
2101                                         'user_text'  => $user->getName(),
2102                                         'timestamp'  => $now
2103                                 ) );
2104
2105                                 $dbw->begin();
2106                                 $revisionId = $revision->insertOn( $dbw );
2107
2108                                 # Update page
2109                                 #
2110                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2111                                 # during the course of this function. This makes sure that EditPage can detect
2112                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2113                                 # before this function is called. A previous function used a separate query, this
2114                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2115                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2116
2117                                 if ( !$ok ) {
2118                                         /* Belated edit conflict! Run away!! */
2119                                         $status->fatal( 'edit-conflict' );
2120
2121                                         # Delete the invalid revision if the DB is not transactional
2122                                         if ( !$wgDBtransactions ) {
2123                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2124                                         }
2125
2126                                         $revisionId = 0;
2127                                         $dbw->rollback();
2128                                 } else {
2129                                         global $wgUseRCPatrol;
2130                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2131                                         # Update recentchanges
2132                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2133                                                 # Mark as patrolled if the user can do so
2134                                                 $patrolled = $wgUseRCPatrol && !count(
2135                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2136                                                 # Add RC row to the DB
2137                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2138                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2139                                                         $revisionId, $patrolled
2140                                                 );
2141
2142                                                 # Log auto-patrolled edits
2143                                                 if ( $patrolled ) {
2144                                                         PatrolLog::record( $rc, true );
2145                                                 }
2146                                         }
2147                                         $user->incEditCount();
2148                                         $dbw->commit();
2149                                 }
2150                         } else {
2151                                 $status->warning( 'edit-no-change' );
2152                                 $revision = null;
2153                                 // Keep the same revision ID, but do some updates on it
2154                                 $revisionId = $this->getLatest();
2155                                 // Update page_touched, this is usually implicit in the page update
2156                                 // Other cache updates are done in onArticleEdit()
2157                                 $this->mTitle->invalidateCache();
2158                         }
2159
2160                         if ( !$wgDBtransactions ) {
2161                                 ignore_user_abort( $userAbort );
2162                         }
2163
2164                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2165                         if ( !$status->isOK() ) {
2166                                 wfProfileOut( __METHOD__ );
2167                                 return $status;
2168                         }
2169
2170                         # Invalidate cache of this article and all pages using this article
2171                         # as a template. Partly deferred.
2172                         Article::onArticleEdit( $this->mTitle );
2173                         # Update links tables, site stats, etc.
2174                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
2175                 } else {
2176                         # Create new article
2177                         $status->value['new'] = true;
2178
2179                         # Set statistics members
2180                         # We work out if it's countable after PST to avoid counter drift
2181                         # when articles are created with {{subst:}}
2182                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2183                         $this->mTotalAdjustment = 1;
2184
2185                         $dbw->begin();
2186
2187                         # Add the page record; stake our claim on this title!
2188                         # This will return false if the article already exists
2189                         $newid = $this->insertOn( $dbw );
2190
2191                         if ( $newid === false ) {
2192                                 $dbw->rollback();
2193                                 $status->fatal( 'edit-already-exists' );
2194
2195                                 wfProfileOut( __METHOD__ );
2196                                 return $status;
2197                         }
2198
2199                         # Save the revision text...
2200                         $revision = new Revision( array(
2201                                 'page'       => $newid,
2202                                 'comment'    => $summary,
2203                                 'minor_edit' => $isminor,
2204                                 'text'       => $text,
2205                                 'user'       => $user->getId(),
2206                                 'user_text'  => $user->getName(),
2207                                 'timestamp'  => $now
2208                         ) );
2209                         $revisionId = $revision->insertOn( $dbw );
2210
2211                         $this->mTitle->resetArticleID( $newid );
2212                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached (FIXME?)
2213                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
2214
2215                         # Update the page record with revision data
2216                         $this->updateRevisionOn( $dbw, $revision, 0 );
2217
2218                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2219
2220                         # Update recentchanges
2221                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2222                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2223
2224                                 # Mark as patrolled if the user can do so
2225                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2226                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2227                                 # Add RC row to the DB
2228                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2229                                         '', strlen( $text ), $revisionId, $patrolled );
2230
2231                                 # Log auto-patrolled edits
2232                                 if ( $patrolled ) {
2233                                         PatrolLog::record( $rc, true );
2234                                 }
2235                         }
2236                         $user->incEditCount();
2237                         $dbw->commit();
2238
2239                         # Update links, etc.
2240                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user );
2241
2242                         # Clear caches
2243                         Article::onArticleCreate( $this->mTitle );
2244
2245                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2246                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2247                 }
2248
2249                 # Do updates right now unless deferral was requested
2250                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2251                         wfDoUpdates();
2252                 }
2253
2254                 // Return the new revision (or null) to the caller
2255                 $status->value['revision'] = $revision;
2256
2257                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2258                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2259
2260                 wfProfileOut( __METHOD__ );
2261                 return $status;
2262         }
2263
2264         /**
2265          * Output a redirect back to the article.
2266          * This is typically used after an edit.
2267          *
2268          * @param $noRedir Boolean: add redirect=no
2269          * @param $sectionAnchor String: section to redirect to, including "#"
2270          * @param $extraQuery String: extra query params
2271          */
2272         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2273                 global $wgOut;
2274
2275                 if ( $noRedir ) {
2276                         $query = 'redirect=no';
2277                         if ( $extraQuery )
2278                                 $query .= "&$extraQuery";
2279                 } else {
2280                         $query = $extraQuery;
2281                 }
2282
2283                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2284         }
2285
2286         /**
2287          * Mark this particular edit/page as patrolled
2288          */
2289         public function markpatrolled() {
2290                 global $wgOut, $wgRequest;
2291
2292                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2293
2294                 # If we haven't been given an rc_id value, we can't do anything
2295                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2296
2297                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2298                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2299                         return;
2300                 }
2301
2302                 $rc = RecentChange::newFromId( $rcid );
2303
2304                 if ( is_null( $rc ) ) {
2305                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2306                         return;
2307                 }
2308
2309                 # It would be nice to see where the user had actually come from, but for now just guess
2310                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2311                 $return = SpecialPage::getTitleFor( $returnto );
2312
2313                 $errors = $rc->doMarkPatrolled();
2314
2315                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2316                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2317
2318                         return;
2319                 }
2320
2321                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2322                         // The hook itself has handled any output
2323                         return;
2324                 }
2325
2326                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2327                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2328                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2329                         $wgOut->returnToMain( false, $return );
2330
2331                         return;
2332                 }
2333
2334                 if ( !empty( $errors ) ) {
2335                         $wgOut->showPermissionsErrorPage( $errors );
2336
2337                         return;
2338                 }
2339
2340                 # Inform the user
2341                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2342                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2343                 $wgOut->returnToMain( false, $return );
2344         }
2345
2346         /**
2347          * User-interface handler for the "watch" action
2348          * @deprecated since 1.18
2349          */
2350         public function watch() {
2351                 Action::factory( 'watch', $this )->show();
2352         }
2353
2354         /**
2355          * Add this page to $wgUser's watchlist
2356          *
2357          * This is safe to be called multiple times
2358          *
2359          * @return bool true on successful watch operation
2360          * @deprecated since 1.18
2361          */
2362         public function doWatch() {
2363                 return Action::factory( 'watch', $this )->execute();
2364         }
2365
2366         /**
2367          * User interface handler for the "unwatch" action.
2368          * @deprecated since 1.18
2369          */
2370         public function unwatch() {
2371                 Action::factory( 'unwatch', $this )->show();
2372         }
2373
2374         /**
2375          * Stop watching a page
2376          * @return bool true on successful unwatch
2377          * @deprecated since 1.18
2378          */
2379         public function doUnwatch() {
2380                 return Action::factory( 'unwatch', $this )->execute();
2381         }
2382
2383         /**
2384          * action=protect handler
2385          */
2386         public function protect() {
2387                 $form = new ProtectionForm( $this );
2388                 $form->execute();
2389         }
2390
2391         /**
2392          * action=unprotect handler (alias)
2393          */
2394         public function unprotect() {
2395                 $this->protect();
2396         }
2397
2398         /**
2399          * Update the article's restriction field, and leave a log entry.
2400          *
2401          * @param $limit Array: set of restriction keys
2402          * @param $reason String
2403          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2404          * @param $expiry Array: per restriction type expiration
2405          * @return bool true on success
2406          */
2407         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2408                 global $wgUser, $wgContLang;
2409
2410                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2411
2412                 $id = $this->mTitle->getArticleID();
2413
2414                 if ( $id <= 0 ) {
2415                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2416                         return false;
2417                 }
2418
2419                 if ( wfReadOnly() ) {
2420                         wfDebug( "updateRestrictions failed: read-only\n" );
2421                         return false;
2422                 }
2423
2424                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2425                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2426                         return false;
2427                 }
2428
2429                 if ( !$cascade ) {
2430                         $cascade = false;
2431                 }
2432
2433                 // Take this opportunity to purge out expired restrictions
2434                 Title::purgeExpiredRestrictions();
2435
2436                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2437                 # we expect a single selection, but the schema allows otherwise.
2438                 $current = array();
2439                 $updated = Article::flattenRestrictions( $limit );
2440                 $changed = false;
2441
2442                 foreach ( $restrictionTypes as $action ) {
2443                         if ( isset( $expiry[$action] ) ) {
2444                                 # Get current restrictions on $action
2445                                 $aLimits = $this->mTitle->getRestrictions( $action );
2446                                 $current[$action] = implode( '', $aLimits );
2447                                 # Are any actual restrictions being dealt with here?
2448                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2449
2450                                 # If something changed, we need to log it. Checking $aRChanged
2451                                 # assures that "unprotecting" a page that is not protected does
2452                                 # not log just because the expiry was "changed".
2453                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2454                                         $changed = true;
2455                                 }
2456                         }
2457                 }
2458
2459                 $current = Article::flattenRestrictions( $current );
2460
2461                 $changed = ( $changed || $current != $updated );
2462                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2463                 $protect = ( $updated != '' );
2464
2465                 # If nothing's changed, do nothing
2466                 if ( $changed ) {
2467                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2468                                 $dbw = wfGetDB( DB_MASTER );
2469
2470                                 # Prepare a null revision to be added to the history
2471                                 $modified = $current != '' && $protect;
2472
2473                                 if ( $protect ) {
2474                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2475                                 } else {
2476                                         $comment_type = 'unprotectedarticle';
2477                                 }
2478
2479                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2480
2481                                 # Only restrictions with the 'protect' right can cascade...
2482                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2483                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2484
2485                                 # The schema allows multiple restrictions
2486                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2487                                         $cascade = false;
2488                                 }
2489
2490                                 $cascade_description = '';
2491
2492                                 if ( $cascade ) {
2493                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2494                                 }
2495
2496                                 if ( $reason ) {
2497                                         $comment .= ": $reason";
2498                                 }
2499
2500                                 $editComment = $comment;
2501                                 $encodedExpiry = array();
2502                                 $protect_description = '';
2503                                 foreach ( $limit as $action => $restrictions ) {
2504                                         if ( !isset( $expiry[$action] ) )
2505                                                 $expiry[$action] = $dbw->getInfinity();
2506
2507                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2508                                         if ( $restrictions != '' ) {
2509                                                 $protect_description .= "[$action=$restrictions] (";
2510                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2511                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2512                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2513                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2514                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2515                                                 } else {
2516                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2517                                                 }
2518
2519                                                 $protect_description .= ') ';
2520                                         }
2521                                 }
2522                                 $protect_description = trim( $protect_description );
2523
2524                                 if ( $protect_description && $protect ) {
2525                                         $editComment .= " ($protect_description)";
2526                                 }
2527
2528                                 if ( $cascade ) {
2529                                         $editComment .= "$cascade_description";
2530                                 }
2531
2532                                 # Update restrictions table
2533                                 foreach ( $limit as $action => $restrictions ) {
2534                                         if ( $restrictions != '' ) {
2535                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2536                                                         array( 'pr_page' => $id,
2537                                                                 'pr_type' => $action,
2538                                                                 'pr_level' => $restrictions,
2539                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2540                                                                 'pr_expiry' => $encodedExpiry[$action]
2541                                                         ),
2542                                                         __METHOD__
2543                                                 );
2544                                         } else {
2545                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2546                                                         'pr_type' => $action ), __METHOD__ );
2547                                         }
2548                                 }
2549
2550                                 # Insert a null revision
2551                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2552                                 $nullRevId = $nullRevision->insertOn( $dbw );
2553
2554                                 $latest = $this->getLatest();
2555                                 # Update page record
2556                                 $dbw->update( 'page',
2557                                         array( /* SET */
2558                                                 'page_touched' => $dbw->timestamp(),
2559                                                 'page_restrictions' => '',
2560                                                 'page_latest' => $nullRevId
2561                                         ), array( /* WHERE */
2562                                                 'page_id' => $id
2563                                         ), 'Article::protect'
2564                                 );
2565
2566                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2567                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2568
2569                                 # Update the protection log
2570                                 $log = new LogPage( 'protect' );
2571                                 if ( $protect ) {
2572                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2573                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2574                                 } else {
2575                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2576                                 }
2577                         } # End hook
2578                 } # End "changed" check
2579
2580                 return true;
2581         }
2582
2583         /**
2584          * Take an array of page restrictions and flatten it to a string
2585          * suitable for insertion into the page_restrictions field.
2586          * @param $limit Array
2587          * @return String
2588          */
2589         protected static function flattenRestrictions( $limit ) {
2590                 if ( !is_array( $limit ) ) {
2591                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2592                 }
2593
2594                 $bits = array();
2595                 ksort( $limit );
2596
2597                 foreach ( $limit as $action => $restrictions ) {
2598                         if ( $restrictions != '' ) {
2599                                 $bits[] = "$action=$restrictions";
2600                         }
2601                 }
2602
2603                 return implode( ':', $bits );
2604         }
2605
2606         /**
2607          * Auto-generates a deletion reason
2608          *
2609          * @param &$hasHistory Boolean: whether the page has a history
2610          * @return mixed String containing deletion reason or empty string, or boolean false
2611          *    if no revision occurred
2612          * @deprecated since 1.18
2613          */
2614         public function generateReason( &$hasHistory ) {
2615                 return DeleteAction::getAutoReason( $this );
2616         }
2617
2618
2619         /*
2620          * UI entry point for page deletion
2621          * @deprecated since 1.18
2622          */
2623         public function delete() {
2624                 return Action::factory( 'delete', $this )->show();
2625         }
2626
2627         /**
2628          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2629          * @deprecated since 1.18
2630          */
2631         public function isBigDeletion() {
2632                 global $wgDeleteRevisionsLimit;
2633                 return $wgDeleteRevisionsLimit && $this->estimateRevisionCount() > $wgDeleteRevisionsLimit;
2634         }
2635
2636         /**
2637          * @return int approximate revision count
2638          */
2639         public function estimateRevisionCount() {
2640                 $dbr = wfGetDB( DB_SLAVE );
2641
2642                 // For an exact count...
2643                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2644                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2645                 return $dbr->estimateRowCount( 'revision', '*',
2646                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2647         }
2648
2649         /**
2650          * Get the last N authors
2651          * @param $num Integer: number of revisions to get
2652          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2653          * @return array Array of authors, duplicates not removed
2654          */
2655         public function getLastNAuthors( $num, $revLatest = 0 ) {
2656                 wfProfileIn( __METHOD__ );
2657                 // First try the slave
2658                 // If that doesn't have the latest revision, try the master
2659                 $continue = 2;
2660                 $db = wfGetDB( DB_SLAVE );
2661
2662                 do {
2663                         $res = $db->select( array( 'page', 'revision' ),
2664                                 array( 'rev_id', 'rev_user_text' ),
2665                                 array(
2666                                         'page_namespace' => $this->mTitle->getNamespace(),
2667                                         'page_title' => $this->mTitle->getDBkey(),
2668                                         'rev_page = page_id'
2669                                 ), __METHOD__,
2670                                 array(
2671                                         'ORDER BY' => 'rev_timestamp DESC',
2672                                         'LIMIT' => $num
2673                                 )
2674                         );
2675
2676                         if ( !$res ) {
2677                                 wfProfileOut( __METHOD__ );
2678                                 return array();
2679                         }
2680
2681                         $row = $db->fetchObject( $res );
2682
2683                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2684                                 $db = wfGetDB( DB_MASTER );
2685                                 $continue--;
2686                         } else {
2687                                 $continue = 0;
2688                         }
2689                 } while ( $continue );
2690
2691                 $authors = array( $row->rev_user_text );
2692
2693                 foreach ( $res as $row ) {
2694                         $authors[] = $row->rev_user_text;
2695                 }
2696
2697                 wfProfileOut( __METHOD__ );
2698                 return $authors;
2699         }
2700
2701         /**
2702          * Perform a deletion and output success or failure messages
2703          * @deprecated since 1.18
2704          */
2705         public function doDelete( $reason, $suppress = false ) {
2706                 return DeleteAction::doDeleteArticle(
2707                         $this,
2708                         $this->getContext(),
2709                         array(
2710                                 'Suppress' => $suppress !== false,
2711                                 'Reason' => $reason,
2712                         ),
2713                         true
2714                 );
2715         }
2716
2717         /**
2718          * Back-end article deletion
2719          * Deletes the article with database consistency, writes logs, purges caches
2720          *
2721          * @param $reason string delete reason for deletion log
2722          * @param suppress bitfield
2723          *      Revision::DELETED_TEXT
2724          *      Revision::DELETED_COMMENT
2725          *      Revision::DELETED_USER
2726          *      Revision::DELETED_RESTRICTED
2727          * @param $id int article ID
2728          * @param $commit boolean defaults to true, triggers transaction end
2729          * @return boolean true if successful
2730          *
2731          * @deprecated since 1.18
2732          */
2733         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2734                 return DeleteAction::doDeleteArticle(
2735                         $this,
2736                         $this->getContext(),
2737                         array(
2738                                 'Suppress' => $suppress !== false,
2739                                 'Reason' => $reason,
2740                         ),
2741                         $commit
2742                 );
2743         }
2744
2745         /**
2746          * Roll back the most recent consecutive set of edits to a page
2747          * from the same user; fails if there are no eligible edits to
2748          * roll back to, e.g. user is the sole contributor. This function
2749          * performs permissions checks on $wgUser, then calls commitRollback()
2750          * to do the dirty work
2751          *
2752          * @param $fromP String: Name of the user whose edits to rollback.
2753          * @param $summary String: Custom summary. Set to default summary if empty.
2754          * @param $token String: Rollback token.
2755          * @param $bot Boolean: If true, mark all reverted edits as bot.
2756          *
2757          * @param $resultDetails Array: contains result-specific array of additional values
2758          *    'alreadyrolled' : 'current' (rev)
2759          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2760          *
2761          * @return array of errors, each error formatted as
2762          *   array(messagekey, param1, param2, ...).
2763          * On success, the array is empty.  This array can also be passed to
2764          * OutputPage::showPermissionsErrorPage().
2765          */
2766         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2767                 global $wgUser;
2768
2769                 $resultDetails = null;
2770
2771                 # Check permissions
2772                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2773                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2774                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2775
2776                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2777                         $errors[] = array( 'sessionfailure' );
2778                 }
2779
2780                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2781                         $errors[] = array( 'actionthrottledtext' );
2782                 }
2783
2784                 # If there were errors, bail out now
2785                 if ( !empty( $errors ) ) {
2786                         return $errors;
2787                 }
2788
2789                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
2790         }
2791
2792         /**
2793          * Backend implementation of doRollback(), please refer there for parameter
2794          * and return value documentation
2795          *
2796          * NOTE: This function does NOT check ANY permissions, it just commits the
2797          * rollback to the DB Therefore, you should only call this function direct-
2798          * ly if you want to use custom permissions checks. If you don't, use
2799          * doRollback() instead.
2800          */
2801         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
2802                 global $wgUseRCPatrol, $wgUser, $wgLang;
2803
2804                 $dbw = wfGetDB( DB_MASTER );
2805
2806                 if ( wfReadOnly() ) {
2807                         return array( array( 'readonlytext' ) );
2808                 }
2809
2810                 # Get the last editor
2811                 $current = Revision::newFromTitle( $this->mTitle );
2812                 if ( is_null( $current ) ) {
2813                         # Something wrong... no page?
2814                         return array( array( 'notanarticle' ) );
2815                 }
2816
2817                 $from = str_replace( '_', ' ', $fromP );
2818                 # User name given should match up with the top revision.
2819                 # If the user was deleted then $from should be empty.
2820                 if ( $from != $current->getUserText() ) {
2821                         $resultDetails = array( 'current' => $current );
2822                         return array( array( 'alreadyrolled',
2823                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2824                                 htmlspecialchars( $fromP ),
2825                                 htmlspecialchars( $current->getUserText() )
2826                         ) );
2827                 }
2828
2829                 # Get the last edit not by this guy...
2830                 # Note: these may not be public values
2831                 $user = intval( $current->getRawUser() );
2832                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2833                 $s = $dbw->selectRow( 'revision',
2834                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2835                         array( 'rev_page' => $current->getPage(),
2836                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2837                         ), __METHOD__,
2838                         array( 'USE INDEX' => 'page_timestamp',
2839                                 'ORDER BY' => 'rev_timestamp DESC' )
2840                         );
2841                 if ( $s === false ) {
2842                         # No one else ever edited this page
2843                         return array( array( 'cantrollback' ) );
2844                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2845                         # Only admins can see this text
2846                         return array( array( 'notvisiblerev' ) );
2847                 }
2848
2849                 $set = array();
2850                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
2851                         # Mark all reverted edits as bot
2852                         $set['rc_bot'] = 1;
2853                 }
2854
2855                 if ( $wgUseRCPatrol ) {
2856                         # Mark all reverted edits as patrolled
2857                         $set['rc_patrolled'] = 1;
2858                 }
2859
2860                 if ( count( $set ) ) {
2861                         $dbw->update( 'recentchanges', $set,
2862                                 array( /* WHERE */
2863                                         'rc_cur_id' => $current->getPage(),
2864                                         'rc_user_text' => $current->getUserText(),
2865                                         "rc_timestamp > '{$s->rev_timestamp}'",
2866                                 ), __METHOD__
2867                         );
2868                 }
2869
2870                 # Generate the edit summary if necessary
2871                 $target = Revision::newFromId( $s->rev_id );
2872                 if ( empty( $summary ) ) {
2873                         if ( $from == '' ) { // no public user name
2874                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2875                         } else {
2876                                 $summary = wfMsgForContent( 'revertpage' );
2877                         }
2878                 }
2879
2880                 # Allow the custom summary to use the same args as the default message
2881                 $args = array(
2882                         $target->getUserText(), $from, $s->rev_id,
2883                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
2884                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
2885                 );
2886                 $summary = wfMsgReplaceArgs( $summary, $args );
2887
2888                 # Save
2889                 $flags = EDIT_UPDATE;
2890
2891                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
2892                         $flags |= EDIT_MINOR;
2893                 }
2894
2895                 if ( $bot && ( $wgUser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2896                         $flags |= EDIT_FORCE_BOT;
2897                 }
2898
2899                 # Actually store the edit
2900                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2901                 if ( !empty( $status->value['revision'] ) ) {
2902                         $revId = $status->value['revision']->getId();
2903                 } else {
2904                         $revId = false;
2905                 }
2906
2907                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2908
2909                 $resultDetails = array(
2910                         'summary' => $summary,
2911                         'current' => $current,
2912                         'target'  => $target,
2913                         'newid'   => $revId
2914                 );
2915
2916                 return array();
2917         }
2918
2919         /**
2920          * User interface for rollback operations
2921          */
2922         public function rollback() {
2923                 global $wgUser, $wgOut, $wgRequest;
2924
2925                 $details = null;
2926
2927                 $result = $this->doRollback(
2928                         $wgRequest->getVal( 'from' ),
2929                         $wgRequest->getText( 'summary' ),
2930                         $wgRequest->getVal( 'token' ),
2931                         $wgRequest->getBool( 'bot' ),
2932                         $details
2933                 );
2934
2935                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
2936                         $wgOut->rateLimited();
2937                         return;
2938                 }
2939
2940                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2941                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2942                         $errArray = $result[0];
2943                         $errMsg = array_shift( $errArray );
2944                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2945
2946                         if ( isset( $details['current'] ) ) {
2947                                 $current = $details['current'];
2948
2949                                 if ( $current->getComment() != '' ) {
2950                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2951                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2952                                 }
2953                         }
2954
2955                         return;
2956                 }
2957
2958                 # Display permissions errors before read-only message -- there's no
2959                 # point in misleading the user into thinking the inability to rollback
2960                 # is only temporary.
2961                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2962                         # array_diff is completely broken for arrays of arrays, sigh.
2963                         # Remove any 'readonlytext' error manually.
2964                         $out = array();
2965                         foreach ( $result as $error ) {
2966                                 if ( $error != array( 'readonlytext' ) ) {
2967                                         $out [] = $error;
2968                                 }
2969                         }
2970                         $wgOut->showPermissionsErrorPage( $out );
2971
2972                         return;
2973                 }
2974
2975                 if ( $result == array( array( 'readonlytext' ) ) ) {
2976                         $wgOut->readOnlyPage();
2977
2978                         return;
2979                 }
2980
2981                 $current = $details['current'];
2982                 $target = $details['target'];
2983                 $newId = $details['newid'];
2984                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2985                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2986
2987                 if ( $current->getUserText() === '' ) {
2988                         $old = wfMsg( 'rev-deleted-user' );
2989                 } else {
2990                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2991                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2992                 }
2993
2994                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2995                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2996                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2997                 $wgOut->returnToMain( false, $this->mTitle );
2998
2999                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3000                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3001                         $de->showDiff( '', '' );
3002                 }
3003         }
3004
3005         /**
3006          * Do standard deferred updates after page view
3007          */
3008         public function viewUpdates() {
3009                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3010                 if ( wfReadOnly() ) {
3011                         return;
3012                 }
3013
3014                 # Don't update page view counters on views from bot users (bug 14044)
3015                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3016                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3017                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3018                 }
3019
3020                 # Update newtalk / watchlist notification status
3021                 $wgUser->clearNotification( $this->mTitle );
3022         }
3023
3024         /**
3025          * Prepare text which is about to be saved.
3026          * Returns a stdclass with source, pst and output members
3027          */
3028         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
3029                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3030                         // Already prepared
3031                         return $this->mPreparedEdit;
3032                 }
3033
3034                 global $wgParser;
3035
3036                 if( $user === null ) {
3037                         global $wgUser;
3038                         $user = $wgUser;
3039                 }
3040                 $popts = ParserOptions::newFromUser( $user );
3041                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
3042
3043                 $edit = (object)array();
3044                 $edit->revid = $revid;
3045                 $edit->newText = $text;
3046                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
3047                 $edit->popts = $this->getParserOptions();
3048                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3049                 $edit->oldText = $this->getRawText();
3050
3051                 $this->mPreparedEdit = $edit;
3052
3053                 return $edit;
3054         }
3055
3056         /**
3057          * Do standard deferred updates after page edit.
3058          * Update links tables, site stats, search index and message cache.
3059          * Purges pages that include this page if the text was changed here.
3060          * Every 100th edit, prune the recent changes table.
3061          *
3062          * @private
3063          * @param $text String: New text of the article
3064          * @param $summary String: Edit summary
3065          * @param $minoredit Boolean: Minor edit
3066          * @param $timestamp_of_pagechange String timestamp associated with the page change
3067          * @param $newid Integer: rev_id value of the new revision
3068          * @param $changed Boolean: Whether or not the content actually changed
3069          * @param $user User object: User doing the edit
3070          */
3071         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true, User $user = null ) {
3072                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
3073
3074                 wfProfileIn( __METHOD__ );
3075
3076                 # Parse the text
3077                 # Be careful not to double-PST: $text is usually already PST-ed once
3078                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3079                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3080                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
3081                 } else {
3082                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3083                         $editInfo = $this->mPreparedEdit;
3084                 }
3085
3086                 # Save it to the parser cache
3087                 if ( $wgEnableParserCache ) {
3088                         $parserCache = ParserCache::singleton();
3089                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3090                 }
3091
3092                 # Update the links tables
3093                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3094                 $u->doUpdate();
3095
3096                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3097
3098                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3099                         if ( 0 == mt_rand( 0, 99 ) ) {
3100                                 // Flush old entries from the `recentchanges` table; we do this on
3101                                 // random requests so as to avoid an increase in writes for no good reason
3102                                 global $wgRCMaxAge;
3103
3104                                 $dbw = wfGetDB( DB_MASTER );
3105                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3106                                 $dbw->delete(
3107                                         'recentchanges',
3108                                         array( "rc_timestamp < '$cutoff'" ),
3109                                         __METHOD__
3110                                 );
3111                         }
3112                 }
3113
3114                 $id = $this->getID();
3115                 $title = $this->mTitle->getPrefixedDBkey();
3116                 $shortTitle = $this->mTitle->getDBkey();
3117
3118                 if ( 0 == $id ) {
3119                         wfProfileOut( __METHOD__ );
3120                         return;
3121                 }
3122
3123                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3124                 array_push( $wgDeferredUpdateList, $u );
3125                 $u = new SearchUpdate( $id, $title, $text );
3126                 array_push( $wgDeferredUpdateList, $u );
3127
3128                 # If this is another user's talk page, update newtalk
3129                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3130                 # load of user talk pages and piss people off, nor if it's a minor edit
3131                 # by a properly-flagged bot.
3132                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3133                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3134                 ) {
3135                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3136                                 $other = User::newFromName( $shortTitle, false );
3137                                 if ( !$other ) {
3138                                         wfDebug( __METHOD__ . ": invalid username\n" );
3139                                 } elseif ( User::isIP( $shortTitle ) ) {
3140                                         // An anonymous user
3141                                         $other->setNewtalk( true );
3142                                 } elseif ( $other->isLoggedIn() ) {
3143                                         $other->setNewtalk( true );
3144                                 } else {
3145                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3146                                 }
3147                         }
3148                 }
3149
3150                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3151                         MessageCache::singleton()->replace( $shortTitle, $text );
3152                 }
3153
3154                 wfProfileOut( __METHOD__ );
3155         }
3156
3157         /**
3158          * Perform article updates on a special page creation.
3159          *
3160          * @param $rev Revision object
3161          *
3162          * @todo This is a shitty interface function. Kill it and replace the
3163          * other shitty functions like editUpdates and such so it's not needed
3164          * anymore.
3165          */
3166         public function createUpdates( $rev ) {
3167                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3168                 $this->mTotalAdjustment = 1;
3169                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3170                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3171         }
3172
3173         /**
3174          * Generate the navigation links when browsing through an article revisions
3175          * It shows the information as:
3176          *   Revision as of \<date\>; view current revision
3177          *   \<- Previous version | Next Version -\>
3178          *
3179          * @param $oldid String: revision ID of this article revision
3180          */
3181         public function setOldSubtitle( $oldid = 0 ) {
3182                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3183
3184                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3185                         return;
3186                 }
3187
3188                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3189
3190                 # Cascade unhide param in links for easy deletion browsing
3191                 $extraParams = array();
3192                 if ( $wgRequest->getVal( 'unhide' ) ) {
3193                         $extraParams['unhide'] = 1;
3194                 }
3195
3196                 $revision = Revision::newFromId( $oldid );
3197
3198                 $current = ( $oldid == $this->mLatest );
3199                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3200                 $tddate = $wgLang->date( $this->mTimestamp, true );
3201                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3202                 $sk = $wgUser->getSkin();
3203                 $lnk = $current
3204                         ? wfMsgHtml( 'currentrevisionlink' )
3205                         : $sk->link(
3206                                 $this->mTitle,
3207                                 wfMsgHtml( 'currentrevisionlink' ),
3208                                 array(),
3209                                 $extraParams,
3210                                 array( 'known', 'noclasses' )
3211                         );
3212                 $curdiff = $current
3213                         ? wfMsgHtml( 'diff' )
3214                         : $sk->link(
3215                                 $this->mTitle,
3216                                 wfMsgHtml( 'diff' ),
3217                                 array(),
3218                                 array(
3219                                         'diff' => 'cur',
3220                                         'oldid' => $oldid
3221                                 ) + $extraParams,
3222                                 array( 'known', 'noclasses' )
3223                         );
3224                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3225                 $prevlink = $prev
3226                         ? $sk->link(
3227                                 $this->mTitle,
3228                                 wfMsgHtml( 'previousrevision' ),
3229                                 array(),
3230                                 array(
3231                                         'direction' => 'prev',
3232                                         'oldid' => $oldid
3233                                 ) + $extraParams,
3234                                 array( 'known', 'noclasses' )
3235                         )
3236                         : wfMsgHtml( 'previousrevision' );
3237                 $prevdiff = $prev
3238                         ? $sk->link(
3239                                 $this->mTitle,
3240                                 wfMsgHtml( 'diff' ),
3241                                 array(),
3242                                 array(
3243                                         'diff' => 'prev',
3244                                         'oldid' => $oldid
3245                                 ) + $extraParams,
3246                                 array( 'known', 'noclasses' )
3247                         )
3248                         : wfMsgHtml( 'diff' );
3249                 $nextlink = $current
3250                         ? wfMsgHtml( 'nextrevision' )
3251                         : $sk->link(
3252                                 $this->mTitle,
3253                                 wfMsgHtml( 'nextrevision' ),
3254                                 array(),
3255                                 array(
3256                                         'direction' => 'next',
3257                                         'oldid' => $oldid
3258                                 ) + $extraParams,
3259                                 array( 'known', 'noclasses' )
3260                         );
3261                 $nextdiff = $current
3262                         ? wfMsgHtml( 'diff' )
3263                         : $sk->link(
3264                                 $this->mTitle,
3265                                 wfMsgHtml( 'diff' ),
3266                                 array(),
3267                                 array(
3268                                         'diff' => 'next',
3269                                         'oldid' => $oldid
3270                                 ) + $extraParams,
3271                                 array( 'known', 'noclasses' )
3272                         );
3273
3274                 $cdel = '';
3275
3276                 // User can delete revisions or view deleted revisions...
3277                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3278                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3279                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3280                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3281                         } else {
3282                                 $query = array(
3283                                         'type'   => 'revision',
3284                                         'target' => $this->mTitle->getPrefixedDbkey(),
3285                                         'ids'    => $oldid
3286                                 );
3287                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3288                         }
3289                         $cdel .= ' ';
3290                 }
3291
3292                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3293                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3294
3295                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
3296                         ? 'revision-info-current'
3297                         : 'revision-info';
3298
3299                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3300                         wfMsgExt(
3301                                 $infomsg,
3302                                 array( 'parseinline', 'replaceafter' ),
3303                                 $td,
3304                                 $userlinks,
3305                                 $revision->getID(),
3306                                 $tddate,
3307                                 $tdtime,
3308                                 $revision->getUser()
3309                         ) .
3310                         "</div>\n" .
3311                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3312                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3313
3314                 $wgOut->addHTML( $r );
3315         }
3316
3317         /**
3318          * This function is called right before saving the wikitext,
3319          * so we can do things like signatures and links-in-context.
3320          *
3321          * @param $text String article contents
3322          * @param $user User object: user doing the edit, $wgUser will be used if
3323          *              null is given
3324          * @param $popts ParserOptions object: parser options, default options for
3325          *               the user loaded if null given
3326          * @return string article contents with altered wikitext markup (signatures
3327          *      converted, {{subst:}}, templates, etc.)
3328          */
3329         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3330                 global $wgParser;
3331
3332                 if ( $user === null ) {
3333                         global $wgUser;
3334                         $user = $wgUser;
3335                 }
3336
3337                 if ( $popts === null ) {
3338                         $popts = ParserOptions::newFromUser( $user );
3339                 }
3340
3341                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3342         }
3343
3344         /* Caching functions */
3345
3346         /**
3347          * checkLastModified returns true if it has taken care of all
3348          * output to the client that is necessary for this request.
3349          * (that is, it has sent a cached version of the page)
3350          *
3351          * @return boolean true if cached version send, false otherwise
3352          */
3353         protected function tryFileCache() {
3354                 static $called = false;
3355
3356                 if ( $called ) {
3357                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3358                         return false;
3359                 }
3360
3361                 $called = true;
3362                 if ( $this->isFileCacheable() ) {
3363                         $cache = new HTMLFileCache( $this->mTitle );
3364                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3365                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3366                                 $cache->loadFromFileCache();
3367                                 return true;
3368                         } else {
3369                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3370                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3371                         }
3372                 } else {
3373                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3374                 }
3375
3376                 return false;
3377         }
3378
3379         /**
3380          * Check if the page can be cached
3381          * @return bool
3382          */
3383         public function isFileCacheable() {
3384                 $cacheable = false;
3385
3386                 if ( HTMLFileCache::useFileCache() ) {
3387                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3388                         // Extension may have reason to disable file caching on some pages.
3389                         if ( $cacheable ) {
3390                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3391                         }
3392                 }
3393
3394                 return $cacheable;
3395         }
3396
3397         /**
3398          * Loads page_touched and returns a value indicating if it should be used
3399          * @return boolean true if not a redirect
3400          */
3401         public function checkTouched() {
3402                 if ( !$this->mDataLoaded ) {
3403                         $this->loadPageData();
3404                 }
3405
3406                 return !$this->mIsRedirect;
3407         }
3408
3409         /**
3410          * Get the page_touched field
3411          * @return string containing GMT timestamp
3412          */
3413         public function getTouched() {
3414                 if ( !$this->mDataLoaded ) {
3415                         $this->loadPageData();
3416                 }
3417
3418                 return $this->mTouched;
3419         }
3420
3421         /**
3422          * Get the page_latest field
3423          * @return integer rev_id of current revision
3424          */
3425         public function getLatest() {
3426                 if ( !$this->mDataLoaded ) {
3427                         $this->loadPageData();
3428                 }
3429
3430                 return (int)$this->mLatest;
3431         }
3432
3433         /**
3434          * Edit an article without doing all that other stuff
3435          * The article must already exist; link tables etc
3436          * are not updated, caches are not flushed.
3437          *
3438          * @param $text String: text submitted
3439          * @param $comment String: comment submitted
3440          * @param $minor Boolean: whereas it's a minor modification
3441          */
3442         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3443                 wfProfileIn( __METHOD__ );
3444
3445                 $dbw = wfGetDB( DB_MASTER );
3446                 $revision = new Revision( array(
3447                         'page'       => $this->getId(),
3448                         'text'       => $text,
3449                         'comment'    => $comment,
3450                         'minor_edit' => $minor ? 1 : 0,
3451                         ) );
3452                 $revision->insertOn( $dbw );
3453                 $this->updateRevisionOn( $dbw, $revision );
3454
3455                 global $wgUser;
3456                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3457
3458                 wfProfileOut( __METHOD__ );
3459         }
3460
3461         /**
3462          * The onArticle*() functions are supposed to be a kind of hooks
3463          * which should be called whenever any of the specified actions
3464          * are done.
3465          *
3466          * This is a good place to put code to clear caches, for instance.
3467          *
3468          * This is called on page move and undelete, as well as edit
3469          *
3470          * @param $title Title object
3471          */
3472         public static function onArticleCreate( $title ) {
3473                 # Update existence markers on article/talk tabs...
3474                 if ( $title->isTalkPage() ) {
3475                         $other = $title->getSubjectPage();
3476                 } else {
3477                         $other = $title->getTalkPage();
3478                 }
3479
3480                 $other->invalidateCache();
3481                 $other->purgeSquid();
3482
3483                 $title->touchLinks();
3484                 $title->purgeSquid();
3485                 $title->deleteTitleProtection();
3486         }
3487
3488         /**
3489          * Clears caches when article is deleted
3490          */
3491         public static function onArticleDelete( $title ) {
3492                 # Update existence markers on article/talk tabs...
3493                 if ( $title->isTalkPage() ) {
3494                         $other = $title->getSubjectPage();
3495                 } else {
3496                         $other = $title->getTalkPage();
3497                 }
3498
3499                 $other->invalidateCache();
3500                 $other->purgeSquid();
3501
3502                 $title->touchLinks();
3503                 $title->purgeSquid();
3504
3505                 # File cache
3506                 HTMLFileCache::clearFileCache( $title );
3507
3508                 # Messages
3509                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3510                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3511                 }
3512
3513                 # Images
3514                 if ( $title->getNamespace() == NS_FILE ) {
3515                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3516                         $update->doUpdate();
3517                 }
3518
3519                 # User talk pages
3520                 if ( $title->getNamespace() == NS_USER_TALK ) {
3521                         $user = User::newFromName( $title->getText(), false );
3522                         $user->setNewtalk( false );
3523                 }
3524
3525                 # Image redirects
3526                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3527         }
3528
3529         /**
3530          * Purge caches on page update etc
3531          *
3532          * @param $title Title object
3533          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3534          */
3535         public static function onArticleEdit( $title ) {
3536                 global $wgDeferredUpdateList;
3537
3538                 // Invalidate caches of articles which include this page
3539                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3540
3541                 // Invalidate the caches of all pages which redirect here
3542                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3543
3544                 # Purge squid for this page only
3545                 $title->purgeSquid();
3546
3547                 # Clear file cache for this page only
3548                 HTMLFileCache::clearFileCache( $title );
3549         }
3550
3551         /**#@-*/
3552
3553         /**
3554          * Overriden by ImagePage class, only present here to avoid a fatal error
3555          * Called for ?action=revert
3556          */
3557         public function revert() {
3558                 global $wgOut;
3559                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3560         }
3561
3562         /**
3563          * Info about this page
3564          * Called for ?action=info when $wgAllowPageInfo is on.
3565          */
3566         public function info() {
3567                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3568
3569                 if ( !$wgAllowPageInfo ) {
3570                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3571                         return;
3572                 }
3573
3574                 $page = $this->mTitle->getSubjectPage();
3575
3576                 $wgOut->setPagetitle( $page->getPrefixedText() );
3577                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3578                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3579
3580                 if ( !$this->mTitle->exists() ) {
3581                         $wgOut->addHTML( '<div class="noarticletext">' );
3582                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3583                                 // This doesn't quite make sense; the user is asking for
3584                                 // information about the _page_, not the message... -- RC
3585                                 $wgOut->addHTML( htmlspecialchars( $this->mTitle->getDefaultMessageText() ) );
3586                         } else {
3587                                 $msg = $wgUser->isLoggedIn()
3588                                         ? 'noarticletext'
3589                                         : 'noarticletextanon';
3590                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3591                         }
3592
3593                         $wgOut->addHTML( '</div>' );
3594                 } else {
3595                         $dbr = wfGetDB( DB_SLAVE );
3596                         $wl_clause = array(
3597                                 'wl_title'     => $page->getDBkey(),
3598                                 'wl_namespace' => $page->getNamespace() );
3599                         $numwatchers = $dbr->selectField(
3600                                 'watchlist',
3601                                 'COUNT(*)',
3602                                 $wl_clause,
3603                                 __METHOD__ );
3604
3605                         $pageInfo = $this->pageCountInfo( $page );
3606                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3607
3608
3609                         //FIXME: unescaped messages
3610                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3611                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
3612
3613                         if ( $talkInfo ) {
3614                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
3615                         }
3616
3617                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3618
3619                         if ( $talkInfo ) {
3620                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3621                         }
3622
3623                         $wgOut->addHTML( '</ul>' );
3624                 }
3625         }
3626
3627         /**
3628          * Return the total number of edits and number of unique editors
3629          * on a given page. If page does not exist, returns false.
3630          *
3631          * @param $title Title object
3632          * @return mixed array or boolean false
3633          */
3634         public function pageCountInfo( $title ) {
3635                 $id = $title->getArticleId();
3636
3637                 if ( $id == 0 ) {
3638                         return false;
3639                 }
3640
3641                 $dbr = wfGetDB( DB_SLAVE );
3642                 $rev_clause = array( 'rev_page' => $id );
3643                 $edits = $dbr->selectField(
3644                         'revision',
3645                         'COUNT(rev_page)',
3646                         $rev_clause,
3647                         __METHOD__
3648                 );
3649                 $authors = $dbr->selectField(
3650                         'revision',
3651                         'COUNT(DISTINCT rev_user_text)',
3652                         $rev_clause,
3653                         __METHOD__
3654                 );
3655
3656                 return array( 'edits' => $edits, 'authors' => $authors );
3657         }
3658
3659         /**
3660          * Return a list of templates used by this article.
3661          * Uses the templatelinks table
3662          *
3663          * @return Array of Title objects
3664          */
3665         public function getUsedTemplates() {
3666                 $result = array();
3667                 $id = $this->mTitle->getArticleID();
3668
3669                 if ( $id == 0 ) {
3670                         return array();
3671                 }
3672
3673                 $dbr = wfGetDB( DB_SLAVE );
3674                 $res = $dbr->select( array( 'templatelinks' ),
3675                         array( 'tl_namespace', 'tl_title' ),
3676                         array( 'tl_from' => $id ),
3677                         __METHOD__ );
3678
3679                 if ( $res !== false ) {
3680                         foreach ( $res as $row ) {
3681                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3682                         }
3683                 }
3684
3685                 return $result;
3686         }
3687
3688         /**
3689          * Returns a list of hidden categories this page is a member of.
3690          * Uses the page_props and categorylinks tables.
3691          *
3692          * @return Array of Title objects
3693          */
3694         public function getHiddenCategories() {
3695                 $result = array();
3696                 $id = $this->mTitle->getArticleID();
3697
3698                 if ( $id == 0 ) {
3699                         return array();
3700                 }
3701
3702                 $dbr = wfGetDB( DB_SLAVE );
3703                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3704                         array( 'cl_to' ),
3705                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3706                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3707                         __METHOD__ );
3708
3709                 if ( $res !== false ) {
3710                         foreach ( $res as $row ) {
3711                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3712                         }
3713                 }
3714
3715                 return $result;
3716         }
3717
3718         /**
3719         * Return an applicable autosummary if one exists for the given edit.
3720         * @param $oldtext String: the previous text of the page.
3721         * @param $newtext String: The submitted text of the page.
3722         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
3723         * @return string An appropriate autosummary, or an empty string.
3724         */
3725         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3726                 global $wgContLang;
3727
3728                 # Decide what kind of autosummary is needed.
3729
3730                 # Redirect autosummaries
3731                 $ot = Title::newFromRedirect( $oldtext );
3732                 $rt = Title::newFromRedirect( $newtext );
3733
3734                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3735                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3736                 }
3737
3738                 # New page autosummaries
3739                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
3740                         # If they're making a new article, give its text, truncated, in the summary.
3741
3742                         $truncatedtext = $wgContLang->truncate(
3743                                 str_replace( "\n", ' ', $newtext ),
3744                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3745
3746                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3747                 }
3748
3749                 # Blanking autosummaries
3750                 if ( $oldtext != '' && $newtext == '' ) {
3751                         return wfMsgForContent( 'autosumm-blank' );
3752                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
3753                         # Removing more than 90% of the article
3754
3755                         $truncatedtext = $wgContLang->truncate(
3756                                 $newtext,
3757                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3758
3759                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3760                 }
3761
3762                 # If we reach this point, there's no applicable autosummary for our case, so our
3763                 # autosummary is empty.
3764                 return '';
3765         }
3766
3767         /**
3768          * Add the primary page-view wikitext to the output buffer
3769          * Saves the text into the parser cache if possible.
3770          * Updates templatelinks if it is out of date.
3771          *
3772          * @param $text String
3773          * @param $cache Boolean
3774          * @param $parserOptions mixed ParserOptions object, or boolean false
3775          */
3776         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
3777                 global $wgOut;
3778
3779                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
3780                 $wgOut->addParserOutput( $this->mParserOutput );
3781         }
3782
3783         /**
3784          * This does all the heavy lifting for outputWikitext, except it returns the parser
3785          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
3786          * say, embedding thread pages within a discussion system (LiquidThreads)
3787          *
3788          * @param $text string
3789          * @param $cache boolean
3790          * @param $parserOptions parsing options, defaults to false
3791          * @return string containing parsed output
3792          */
3793         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
3794                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
3795
3796                 if ( !$parserOptions ) {
3797                         $parserOptions = $this->getParserOptions();
3798                 }
3799
3800                 $time = - wfTime();
3801                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
3802                         $parserOptions, true, true, $this->getRevIdFetched() );
3803                 $time += wfTime();
3804
3805                 # Timing hack
3806                 if ( $time > 3 ) {
3807                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3808                                 $this->mTitle->getPrefixedDBkey() ) );
3809                 }
3810
3811                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
3812                         $parserCache = ParserCache::singleton();
3813                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
3814                 }
3815
3816                 // Make sure file cache is not used on uncacheable content.
3817                 // Output that has magic words in it can still use the parser cache
3818                 // (if enabled), though it will generally expire sooner.
3819                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
3820                         $wgUseFileCache = false;
3821                 }
3822
3823                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
3824
3825                 return $this->mParserOutput;
3826         }
3827
3828         /**
3829          * Get parser options suitable for rendering the primary article wikitext
3830          * @return mixed ParserOptions object or boolean false
3831          */
3832         public function getParserOptions() {
3833                 global $wgUser;
3834
3835                 if ( !$this->mParserOptions ) {
3836                         $this->mParserOptions = new ParserOptions( $wgUser );
3837                         $this->mParserOptions->setTidy( true );
3838                         $this->mParserOptions->enableLimitReport();
3839                 }
3840
3841                 // Clone to allow modifications of the return value without affecting
3842                 // the cache
3843                 return clone $this->mParserOptions;
3844         }
3845
3846         /**
3847          * Updates cascading protections
3848          *
3849          * @param $parserOutput mixed ParserOptions object, or boolean false
3850          **/
3851         protected function doCascadeProtectionUpdates( $parserOutput ) {
3852                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3853                         return;
3854                 }
3855
3856                 // templatelinks table may have become out of sync,
3857                 // especially if using variable-based transclusions.
3858                 // For paranoia, check if things have changed and if
3859                 // so apply updates to the database. This will ensure
3860                 // that cascaded protections apply as soon as the changes
3861                 // are visible.
3862
3863                 # Get templates from templatelinks
3864                 $id = $this->mTitle->getArticleID();
3865
3866                 $tlTemplates = array();
3867
3868                 $dbr = wfGetDB( DB_SLAVE );
3869                 $res = $dbr->select( array( 'templatelinks' ),
3870                         array( 'tl_namespace', 'tl_title' ),
3871                         array( 'tl_from' => $id ),
3872                         __METHOD__
3873                 );
3874
3875                 foreach ( $res as $row ) {
3876                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3877                 }
3878
3879                 # Get templates from parser output.
3880                 $poTemplates = array();
3881                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3882                         foreach ( $templates as $dbk => $id ) {
3883                                 $poTemplates["$ns:$dbk"] = true;
3884                         }
3885                 }
3886
3887                 # Get the diff
3888                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3889
3890                 if ( count( $templates_diff ) > 0 ) {
3891                         # Whee, link updates time.
3892                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3893                         $u->doUpdate();
3894                 }
3895         }
3896
3897         /**
3898          * Update all the appropriate counts in the category table, given that
3899          * we've added the categories $added and deleted the categories $deleted.
3900          *
3901          * @param $added array   The names of categories that were added
3902          * @param $deleted array The names of categories that were deleted
3903          */
3904         public function updateCategoryCounts( $added, $deleted ) {
3905                 $ns = $this->mTitle->getNamespace();
3906                 $dbw = wfGetDB( DB_MASTER );
3907
3908                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3909                 # exist, we might legitimately not create it, but it's simpler to just
3910                 # create it and then give it a negative value, since the value is bogus
3911                 # anyway.
3912                 #
3913                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3914                 $insertCats = array_merge( $added, $deleted );
3915                 if ( !$insertCats ) {
3916                         # Okay, nothing to do
3917                         return;
3918                 }
3919
3920                 $insertRows = array();
3921
3922                 foreach ( $insertCats as $cat ) {
3923                         $insertRows[] = array(
3924                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
3925                                 'cat_title' => $cat
3926                         );
3927                 }
3928                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3929
3930                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3931                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3932
3933                 if ( $ns == NS_CATEGORY ) {
3934                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3935                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3936                 } elseif ( $ns == NS_FILE ) {
3937                         $addFields[]    = 'cat_files = cat_files + 1';
3938                         $removeFields[] = 'cat_files = cat_files - 1';
3939                 }
3940
3941                 if ( $added ) {
3942                         $dbw->update(
3943                                 'category',
3944                                 $addFields,
3945                                 array( 'cat_title' => $added ),
3946                                 __METHOD__
3947                         );
3948                 }
3949
3950                 if ( $deleted ) {
3951                         $dbw->update(
3952                                 'category',
3953                                 $removeFields,
3954                                 array( 'cat_title' => $deleted ),
3955                                 __METHOD__
3956                         );
3957                 }
3958         }
3959
3960         /**
3961          * Lightweight method to get the parser output for a page, checking the parser cache
3962          * and so on. Doesn't consider most of the stuff that Article::view is forced to
3963          * consider, so it's not appropriate to use there.
3964          *
3965          * @since 1.16 (r52326) for LiquidThreads
3966          *
3967          * @param $oldid mixed integer Revision ID or null
3968          * @return ParserOutput or false if the given revsion ID is not found
3969          */
3970         public function getParserOutput( $oldid = null ) {
3971                 global $wgEnableParserCache, $wgUser;
3972
3973                 // Should the parser cache be used?
3974                 $useParserCache = $wgEnableParserCache &&
3975                         $wgUser->getStubThreshold() == 0 &&
3976                         $this->exists() &&
3977                         $oldid === null;
3978
3979                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
3980
3981                 if ( $wgUser->getStubThreshold() ) {
3982                         wfIncrStats( 'pcache_miss_stub' );
3983                 }
3984
3985                 if ( $useParserCache ) {
3986                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
3987                         if ( $parserOutput !== false ) {
3988                                 return $parserOutput;
3989                         }
3990                 }
3991
3992                 // Cache miss; parse and output it.
3993                 if ( $oldid === null ) {
3994                         $text = $this->getRawText();
3995                 } else {
3996                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
3997                         if ( $rev === null ) {
3998                                 return false;
3999                         }
4000                         $text = $rev->getText();
4001                 }
4002
4003                 return $this->getOutputFromWikitext( $text, $useParserCache );
4004         }
4005
4006         /**
4007          * Sets the context this Article is executed in
4008          *
4009          * @param $context RequestContext
4010          * @since 1.18
4011          */
4012         public function setContext( $context ) {
4013                 $this->mContext = $context;
4014         }
4015
4016         /**
4017          * Gets the context this Article is executed in
4018          *
4019          * @return RequestContext
4020          * @since 1.18
4021          */
4022         public function getContext() {
4023                 if ( $this->mContext instanceof RequestContext ) {
4024                         return $this->mContext;
4025                 } else {
4026                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
4027                         return RequestContext::getMain();
4028                 }
4029         }
4030
4031 }
4032
4033 class PoolWorkArticleView extends PoolCounterWork {
4034         private $mArticle;
4035
4036         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4037                 parent::__construct( 'ArticleView', $key );
4038                 $this->mArticle = $article;
4039                 $this->cacheable = $useParserCache;
4040                 $this->parserOptions = $parserOptions;
4041         }
4042
4043         function doWork() {
4044                 return $this->mArticle->doViewParse();
4045         }
4046
4047         function getCachedWork() {
4048                 global $wgOut;
4049
4050                 $parserCache = ParserCache::singleton();
4051                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4052
4053                 if ( $this->mArticle->mParserOutput !== false ) {
4054                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4055                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4056                         # Ensure that UI elements requiring revision ID have
4057                         # the correct version information.
4058                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4059                         return true;
4060                 }
4061                 return false;
4062         }
4063
4064         function fallback() {
4065                 return $this->mArticle->tryDirtyCache();
4066         }
4067
4068         function error( $status ) {
4069                 global $wgOut;
4070
4071                 $wgOut->clearHTML(); // for release() errors
4072                 $wgOut->enableClientCache( false );
4073                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4074
4075                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4076                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4077
4078                 return false;
4079         }
4080 }