includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  * @internal documentation reviewed 15 Mar 2010
  15  */
  16 class Article {
  17         /**@{{
  18          * @private
  19          */
  20         var $mComment = '';               // !<
  21         var $mContent;                    // !<
  22         var $mContentLoaded = false;      // !<
  23         var $mCounter = -1;               // !< Not loaded
  24         var $mCurID = -1;                 // !< Not loaded
  25         var $mDataLoaded = false;         // !<
  26         var $mForUpdate = false;          // !<
  27         var $mGoodAdjustment = 0;         // !<
  28         var $mIsRedirect = false;         // !<
  29         var $mLatest = false;             // !<
  30         var $mMinorEdit;                  // !<
  31         var $mOldId;                      // !<
  32         var $mPreparedEdit = false;       // !< Title object if set
  33         var $mRedirectedFrom = null;      // !< Title object if set
  34         var $mRedirectTarget = null;      // !< Title object if set
  35         var $mRedirectUrl = false;        // !<
  36         var $mRevIdFetched = 0;           // !<
  37         var $mRevision;                   // !< Revision object if set
  38         var $mTimestamp = '';             // !<
  39         var $mTitle;                      // !< Title object
  40         var $mTotalAdjustment = 0;        // !<
  41         var $mTouched = '19700101000000'; // !<
  42         var $mUser = -1;                  // !< Not loaded
  43         var $mUserText = '';              // !< username from Revision if set
  44         var $mParserOptions;              // !< ParserOptions object
  45         var $mParserOutput;               // !< ParserCache object if set
  46         /**@}}*/
  47
  48         /**
  49          * Constructor and clear the article
  50          * @param $title Reference to a Title object.
  51          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  52          */
  53         public function __construct( Title $title, $oldId = null ) {
  54                 $this->mTitle =& $title;
  55                 $this->mOldId = $oldId;
  56         }
  57
  58         /**
  59          * Constructor from an article article
  60          * @param $id The article ID to load
  61          */
  62         public static function newFromID( $id ) {
  63                 $t = Title::newFromID( $id );
  64                 # FIXME: doesn't inherit right
  65                 return $t == null ? null : new self( $t );
  66                 # return $t == null ? null : new static( $t ); // PHP 5.3
  67         }
  68
  69         /**
  70          * Tell the page view functions that this view was redirected
  71          * from another page on the wiki.
  72          * @param $from Title object.
  73          */
  74         public function setRedirectedFrom( Title $from ) {
  75                 $this->mRedirectedFrom = $from;
  76         }
  77
  78         /**
  79          * If this page is a redirect, get its target
  80          *
  81          * The target will be fetched from the redirect table if possible.
  82          * If this page doesn't have an entry there, call insertRedirect()
  83          * @return mixed Title object, or null if this page is not a redirect
  84          */
  85         public function getRedirectTarget() {
  86                 if ( !$this->mTitle || !$this->mTitle->isRedirect() ) {
  87                         return null;
  88                 }
  89
  90                 if ( !is_null( $this->mRedirectTarget ) ) {
  91                         return $this->mRedirectTarget;
  92                 }
  93
  94                 # Query the redirect table
  95                 $dbr = wfGetDB( DB_SLAVE );
  96                 $row = $dbr->selectRow( 'redirect',
  97                         array( 'rd_namespace', 'rd_title' ),
  98                         array( 'rd_from' => $this->getID() ),
  99                         __METHOD__
 100                 );
 101
 102                 if ( $row ) {
 103                         return $this->mRedirectTarget = Title::makeTitle( $row->rd_namespace, $row->rd_title );
 104                 }
 105
 106                 # This page doesn't have an entry in the redirect table
 107                 return $this->mRedirectTarget = $this->insertRedirect();
 108         }
 109
 110         /**
 111          * Insert an entry for this page into the redirect table.
 112          *
 113          * Don't call this function directly unless you know what you're doing.
 114          * @return Title object
 115          */
 116         public function insertRedirect() {
 117                 $retval = Title::newFromRedirect( $this->getContent() );
 118
 119                 if ( !$retval ) {
 120                         return null;
 121                 }
 122
 123                 $dbw = wfGetDB( DB_MASTER );
 124                 $dbw->replace( 'redirect', array( 'rd_from' ),
 125                         array(
 126                                 'rd_from' => $this->getID(),
 127                                 'rd_namespace' => $retval->getNamespace(),
 128                                 'rd_title' => $retval->getDBkey()
 129                         ),
 130                         __METHOD__
 131                 );
 132
 133                 return $retval;
 134         }
 135
 136         /**
 137          * Get the Title object this page redirects to
 138          *
 139          * @return mixed false, Title of in-wiki target, or string with URL
 140          */
 141         public function followRedirect() {
 142                 $text = $this->getContent();
 143
 144                 return $this->followRedirectText( $text );
 145         }
 146
 147         /**
 148          * Get the Title object this text redirects to
 149          *
 150          * @param $text string article content containing redirect info
 151          * @return mixed false, Title of in-wiki target, or string with URL
 152          */
 153         public function followRedirectText( $text ) {
 154                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 155                 # process if title object is valid and not special:userlogout
 156
 157                 if ( $rt ) {
 158                         if ( $rt->getInterwiki() != '' ) {
 159                                 if ( $rt->isLocal() ) {
 160                                         // Offsite wikis need an HTTP redirect.
 161                                         //
 162                                         // This can be hard to reverse and may produce loops,
 163                                         // so they may be disabled in the site configuration.
 164                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 165                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 166                                 }
 167                         } else {
 168                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 169                                         // Gotta handle redirects to special pages differently:
 170                                         // Fill the HTTP response "Location" header and ignore
 171                                         // the rest of the page we're on.
 172                                         //
 173                                         // This can be hard to reverse, so they may be disabled.
 174                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 175                                                 // rolleyes
 176                                         } else {
 177                                                 return $rt->getFullURL();
 178                                         }
 179                                 }
 180
 181                                 return $rt;
 182                         }
 183                 }
 184
 185                 // No or invalid redirect
 186                 return false;
 187         }
 188
 189         /**
 190          * get the title object of the article
 191          * @return Title object of current title
 192          */
 193         public function getTitle() {
 194                 return $this->mTitle;
 195         }
 196
 197         /**
 198          * Clear the object
 199          * @private
 200          */
 201         public function clear() {
 202                 $this->mDataLoaded    = false;
 203                 $this->mContentLoaded = false;
 204
 205                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 206                 $this->mRedirectedFrom = null; # Title object if set
 207                 $this->mRedirectTarget = null; # Title object if set
 208                 $this->mUserText =
 209                 $this->mTimestamp = $this->mComment = '';
 210                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 211                 $this->mTouched = '19700101000000';
 212                 $this->mForUpdate = false;
 213                 $this->mIsRedirect = false;
 214                 $this->mRevIdFetched = 0;
 215                 $this->mRedirectUrl = false;
 216                 $this->mLatest = false;
 217                 $this->mPreparedEdit = false;
 218         }
 219
 220         /**
 221          * Note that getContent/loadContent do not follow redirects anymore.
 222          * If you need to fetch redirectable content easily, try
 223          * the shortcut in Article::followContent()
 224          *
 225          * @return Return the text of this revision
 226          */
 227         public function getContent() {
 228                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 229
 230                 wfProfileIn( __METHOD__ );
 231
 232                 if ( $this->getID() === 0 ) {
 233                         # If this is a MediaWiki:x message, then load the messages
 234                         # and return the message value for x.
 235                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 236                                 # If this is a system message, get the default text.
 237                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 238                                 $wgMessageCache->loadAllMessages( $lang );
 239                                 $text = wfMsgGetKey( $message, false, $lang, false );
 240
 241                                 if ( wfEmptyMsg( $message, $text ) )
 242                                         $text = '';
 243                         } else {
 244                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 245                         }
 246                         wfProfileOut( __METHOD__ );
 247
 248                         return $text;
 249                 } else {
 250                         $this->loadContent();
 251                         wfProfileOut( __METHOD__ );
 252
 253                         return $this->mContent;
 254                 }
 255         }
 256
 257         /**
 258          * Get the text of the current revision. No side-effects...
 259          *
 260          * @return Return the text of the current revision
 261          */
 262         public function getRawText() {
 263                 // Check process cache for current revision
 264                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 265                         return $this->mContent;
 266                 }
 267
 268                 $rev = Revision::newFromTitle( $this->mTitle );
 269                 $text = $rev ? $rev->getRawText() : false;
 270
 271                 return $text;
 272         }
 273
 274         /**
 275          * This function returns the text of a section, specified by a number ($section).
 276          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 277          * the first section before any such heading (section 0).
 278          *
 279          * If a section contains subsections, these are also returned.
 280          *
 281          * @param $text String: text to look in
 282          * @param $section Integer: section number
 283          * @return string text of the requested section
 284          * @deprecated
 285          */
 286         public function getSection( $text, $section ) {
 287                 global $wgParser;
 288
 289                 return $wgParser->getSection( $text, $section );
 290         }
 291
 292         /**
 293          * Get the text that needs to be saved in order to undo all revisions
 294          * between $undo and $undoafter. Revisions must belong to the same page,
 295          * must exist and must not be deleted
 296          * @param $undo Revision
 297          * @param $undoafter Revision Must be an earlier revision than $undo
 298          * @return mixed string on success, false on failure
 299          */
 300         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 301                 $undo_text = $undo->getText();
 302                 $undoafter_text = $undoafter->getText();
 303                 $cur_text = $this->getContent();
 304
 305                 if ( $cur_text == $undo_text ) {
 306                         # No use doing a merge if it's just a straight revert.
 307                         return $undoafter_text;
 308                 }
 309
 310                 $undone_text = '';
 311
 312                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 313                         return false;
 314                 }
 315
 316                 return $undone_text;
 317         }
 318
 319         /**
 320          * @return int The oldid of the article that is to be shown, 0 for the
 321          *             current revision
 322          */
 323         public function getOldID() {
 324                 if ( is_null( $this->mOldId ) ) {
 325                         $this->mOldId = $this->getOldIDFromRequest();
 326                 }
 327
 328                 return $this->mOldId;
 329         }
 330
 331         /**
 332          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 333          *
 334          * @return int The old id for the request
 335          */
 336         public function getOldIDFromRequest() {
 337                 global $wgRequest;
 338
 339                 $this->mRedirectUrl = false;
 340
 341                 $oldid = $wgRequest->getVal( 'oldid' );
 342
 343                 if ( isset( $oldid ) ) {
 344                         $oldid = intval( $oldid );
 345                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 346                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 347                                 if ( $nextid ) {
 348                                         $oldid = $nextid;
 349                                 } else {
 350                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 351                                 }
 352                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 353                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 354                                 if ( $previd ) {
 355                                         $oldid = $previd;
 356                                 }
 357                         }
 358                 }
 359
 360                 if ( !$oldid ) {
 361                         $oldid = 0;
 362                 }
 363
 364                 return $oldid;
 365         }
 366
 367         /**
 368          * Load the revision (including text) into this object
 369          */
 370         function loadContent() {
 371                 if ( $this->mContentLoaded ) {
 372                         return;
 373                 }
 374
 375                 wfProfileIn( __METHOD__ );
 376
 377                 # Query variables :P
 378                 $oldid = $this->getOldID();
 379                 # Pre-fill content with error message so that if something
 380                 # fails we'll have something telling us what we intended.
 381                 $this->mOldId = $oldid;
 382                 $this->fetchContent( $oldid );
 383
 384                 wfProfileOut( __METHOD__ );
 385         }
 386
 387         /**
 388          * Fetch a page record with the given conditions
 389          * @param $dbr Database object
 390          * @param $conditions Array
 391          * @return mixed Database result resource, or false on failure
 392          */
 393         protected function pageData( $dbr, $conditions ) {
 394                 $fields = array(
 395                                 'page_id',
 396                                 'page_namespace',
 397                                 'page_title',
 398                                 'page_restrictions',
 399                                 'page_counter',
 400                                 'page_is_redirect',
 401                                 'page_is_new',
 402                                 'page_random',
 403                                 'page_touched',
 404                                 'page_latest',
 405                                 'page_len',
 406                 );
 407
 408                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 409
 410                 $row = $dbr->selectRow(
 411                         'page',
 412                         $fields,
 413                         $conditions,
 414                         __METHOD__
 415                 );
 416
 417                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 418
 419                 return $row ;
 420         }
 421
 422         /**
 423          * Fetch a page record matching the Title object's namespace and title
 424          * using a sanitized title string
 425          *
 426          * @param $dbr Database object
 427          * @param $title Title object
 428          * @return mixed Database result resource, or false on failure
 429          */
 430         public function pageDataFromTitle( $dbr, $title ) {
 431                 return $this->pageData( $dbr, array(
 432                         'page_namespace' => $title->getNamespace(),
 433                         'page_title'     => $title->getDBkey() ) );
 434         }
 435
 436         /**
 437          * Fetch a page record matching the requested ID
 438          *
 439          * @param $dbr Database
 440          * @param $id Integer
 441          */
 442         protected function pageDataFromId( $dbr, $id ) {
 443                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 444         }
 445
 446         /**
 447          * Set the general counter, title etc data loaded from
 448          * some source.
 449          *
 450          * @param $data Database row object or "fromdb"
 451          */
 452         public function loadPageData( $data = 'fromdb' ) {
 453                 if ( $data === 'fromdb' ) {
 454                         $dbr = wfGetDB( DB_MASTER );
 455                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 456                 }
 457
 458                 $lc = LinkCache::singleton();
 459
 460                 if ( $data ) {
 461                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 462
 463                         $this->mTitle->mArticleID = intval( $data->page_id );
 464
 465                         # Old-fashioned restrictions
 466                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 467
 468                         $this->mCounter     = intval( $data->page_counter );
 469                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 470                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 471                         $this->mLatest      = intval( $data->page_latest );
 472                 } else {
 473                         if ( is_object( $this->mTitle ) ) {
 474                                 $lc->addBadLinkObj( $this->mTitle );
 475                         }
 476                         $this->mTitle->mArticleID = 0;
 477                 }
 478
 479                 $this->mDataLoaded = true;
 480         }
 481
 482         /**
 483          * Get text of an article from database
 484          * Does *NOT* follow redirects.
 485          *
 486          * @param $oldid Int: 0 for whatever the latest revision is
 487          * @return mixed string containing article contents, or false if null
 488          */
 489         function fetchContent( $oldid = 0 ) {
 490                 if ( $this->mContentLoaded ) {
 491                         return $this->mContent;
 492                 }
 493
 494                 $dbr = wfGetDB( DB_MASTER );
 495
 496                 # Pre-fill content with error message so that if something
 497                 # fails we'll have something telling us what we intended.
 498                 $t = $this->mTitle->getPrefixedText();
 499                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 500                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 501
 502                 if ( $oldid ) {
 503                         $revision = Revision::newFromId( $oldid );
 504                         if ( is_null( $revision ) ) {
 505                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 506                                 return false;
 507                         }
 508
 509                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 510
 511                         if ( !$data ) {
 512                                 wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 513                                 return false;
 514                         }
 515
 516                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 517                         $this->loadPageData( $data );
 518                 } else {
 519                         if ( !$this->mDataLoaded ) {
 520                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 521
 522                                 if ( !$data ) {
 523                                         wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 524                                         return false;
 525                                 }
 526
 527                                 $this->loadPageData( $data );
 528                         }
 529                         $revision = Revision::newFromId( $this->mLatest );
 530                         if ( is_null( $revision ) ) {
 531                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 532                                 return false;
 533                         }
 534                 }
 535
 536                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 537                 // We should instead work with the Revision object when we need it...
 538                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 539
 540                 $this->mUser      = $revision->getUser();
 541                 $this->mUserText  = $revision->getUserText();
 542                 $this->mComment   = $revision->getComment();
 543                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 544
 545                 $this->mRevIdFetched = $revision->getId();
 546                 $this->mContentLoaded = true;
 547                 $this->mRevision =& $revision;
 548
 549                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 550
 551                 return $this->mContent;
 552         }
 553
 554         /**
 555          * Read/write accessor to select FOR UPDATE
 556          *
 557          * @param $x Mixed: FIXME
 558          * @return mixed value of $x, or value stored in Article::mForUpdate
 559          */
 560         public function forUpdate( $x = null ) {
 561                 return wfSetVar( $this->mForUpdate, $x );
 562         }
 563
 564         /**
 565          * Get the database which should be used for reads
 566          *
 567          * @return Database
 568          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 569          */
 570         function getDB() {
 571                 wfDeprecated( __METHOD__ );
 572                 return wfGetDB( DB_MASTER );
 573         }
 574
 575         /**
 576          * Get options for all SELECT statements
 577          *
 578          * @param $options Array: an optional options array which'll be appended to
 579          *                       the default
 580          * @return Array: options
 581          */
 582         protected function getSelectOptions( $options = '' ) {
 583                 if ( $this->mForUpdate ) {
 584                         if ( is_array( $options ) ) {
 585                                 $options[] = 'FOR UPDATE';
 586                         } else {
 587                                 $options = 'FOR UPDATE';
 588                         }
 589                 }
 590
 591                 return $options;
 592         }
 593
 594         /**
 595          * @return int Page ID
 596          */
 597         public function getID() {
 598                 if ( $this->mTitle ) {
 599                         return $this->mTitle->getArticleID();
 600                 } else {
 601                         return 0;
 602                 }
 603         }
 604
 605         /**
 606          * @return bool Whether or not the page exists in the database
 607          */
 608         public function exists() {
 609                 return $this->getId() > 0;
 610         }
 611
 612         /**
 613          * Check if this page is something we're going to be showing
 614          * some sort of sensible content for. If we return false, page
 615          * views (plain action=view) will return an HTTP 404 response,
 616          * so spiders and robots can know they're following a bad link.
 617          *
 618          * @return bool
 619          */
 620         public function hasViewableContent() {
 621                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 622         }
 623
 624         /**
 625          * @return int The view count for the page
 626          */
 627         public function getCount() {
 628                 if ( -1 == $this->mCounter ) {
 629                         $id = $this->getID();
 630
 631                         if ( $id == 0 ) {
 632                                 $this->mCounter = 0;
 633                         } else {
 634                                 $dbr = wfGetDB( DB_SLAVE );
 635                                 $this->mCounter = $dbr->selectField( 'page',
 636                                         'page_counter',
 637                                         array( 'page_id' => $id ),
 638                                         __METHOD__,
 639                                         $this->getSelectOptions()
 640                                 );
 641                         }
 642                 }
 643
 644                 return $this->mCounter;
 645         }
 646
 647         /**
 648          * Determine whether a page would be suitable for being counted as an
 649          * article in the site_stats table based on the title & its content
 650          *
 651          * @param $text String: text to analyze
 652          * @return bool
 653          */
 654         public function isCountable( $text ) {
 655                 global $wgUseCommaCount;
 656
 657                 $token = $wgUseCommaCount ? ',' : '[[';
 658
 659                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 660         }
 661
 662         /**
 663          * Tests if the article text represents a redirect
 664          *
 665          * @param $text mixed string containing article contents, or boolean
 666          * @return bool
 667          */
 668         public function isRedirect( $text = false ) {
 669                 if ( $text === false ) {
 670                         if ( $this->mDataLoaded ) {
 671                                 return $this->mIsRedirect;
 672                         }
 673
 674                         // Apparently loadPageData was never called
 675                         $this->loadContent();
 676                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 677                 } else {
 678                         $titleObj = Title::newFromRedirect( $text );
 679                 }
 680
 681                 return $titleObj !== null;
 682         }
 683
 684         /**
 685          * Returns true if the currently-referenced revision is the current edit
 686          * to this page (and it exists).
 687          * @return bool
 688          */
 689         public function isCurrent() {
 690                 # If no oldid, this is the current version.
 691                 if ( $this->getOldID() == 0 ) {
 692                         return true;
 693                 }
 694
 695                 return $this->exists() && isset( $this->mRevision ) && $this->mRevision->isCurrent();
 696         }
 697
 698         /**
 699          * Loads everything except the text
 700          * This isn't necessary for all uses, so it's only done if needed.
 701          */
 702         protected function loadLastEdit() {
 703                 if ( -1 != $this->mUser ) {
 704                         return;
 705                 }
 706
 707                 # New or non-existent articles have no user information
 708                 $id = $this->getID();
 709                 if ( 0 == $id ) {
 710                         return;
 711                 }
 712
 713                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 714                 if ( !is_null( $this->mLastRevision ) ) {
 715                         $this->mUser      = $this->mLastRevision->getUser();
 716                         $this->mUserText  = $this->mLastRevision->getUserText();
 717                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 718                         $this->mComment   = $this->mLastRevision->getComment();
 719                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 720                         $this->mRevIdFetched = $this->mLastRevision->getId();
 721                 }
 722         }
 723
 724         /**
 725          * @return string GMT timestamp of last article revision
 726          **/
 727
 728         public function getTimestamp() {
 729                 // Check if the field has been filled by ParserCache::get()
 730                 if ( !$this->mTimestamp ) {
 731                         $this->loadLastEdit();
 732                 }
 733
 734                 return wfTimestamp( TS_MW, $this->mTimestamp );
 735         }
 736
 737         /**
 738          * @return int user ID for the user that made the last article revision
 739          */
 740         public function getUser() {
 741                 $this->loadLastEdit();
 742
 743                 return $this->mUser;
 744         }
 745
 746         /**
 747          * @return string username of the user that made the last article revision
 748          */
 749         public function getUserText() {
 750                 $this->loadLastEdit();
 751
 752                 return $this->mUserText;
 753         }
 754
 755         /**
 756          * @return string Comment stored for the last article revision
 757          */
 758         public function getComment() {
 759                 $this->loadLastEdit();
 760
 761                 return $this->mComment;
 762         }
 763
 764         /**
 765          * Returns true if last revision was marked as "minor edit"
 766          *
 767          * @return boolean Minor edit indicator for the last article revision.
 768          */
 769         public function getMinorEdit() {
 770                 $this->loadLastEdit();
 771
 772                 return $this->mMinorEdit;
 773         }
 774
 775         /**
 776          * Use this to fetch the rev ID used on page views
 777          *
 778          * @return int revision ID of last article revision
 779          */
 780         public function getRevIdFetched() {
 781                 $this->loadLastEdit();
 782
 783                 return $this->mRevIdFetched;
 784         }
 785
 786         /**
 787          * @param $limit Integer: default 0.
 788          * @param $offset Integer: default 0.
 789          * @return UserArrayFromResult object with User objects of article contributors for requested range
 790          */
 791         public function getContributors( $limit = 0, $offset = 0 ) {
 792                 # FIXME: this is expensive; cache this info somewhere.
 793
 794                 $dbr = wfGetDB( DB_SLAVE );
 795                 $revTable = $dbr->tableName( 'revision' );
 796                 $userTable = $dbr->tableName( 'user' );
 797
 798                 $pageId = $this->getId();
 799
 800                 $user = $this->getUser();
 801
 802                 if ( $user ) {
 803                         $excludeCond = "AND rev_user != $user";
 804                 } else {
 805                         $userText = $dbr->addQuotes( $this->getUserText() );
 806                         $excludeCond = "AND rev_user_text != $userText";
 807                 }
 808
 809                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 810
 811                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 812                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 813                         WHERE rev_page = $pageId
 814                         $excludeCond
 815                         AND $deletedBit = 0
 816                         GROUP BY rev_user, rev_user_text
 817                         ORDER BY timestamp DESC";
 818
 819                 if ( $limit > 0 ) {
 820                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 821                 }
 822
 823                 $sql .= ' ' . $this->getSelectOptions();
 824                 $res = $dbr->query( $sql, __METHOD__ );
 825
 826                 return new UserArrayFromResult( $res );
 827         }
 828
 829         /**
 830          * This is the default action of the index.php entry point: just view the
 831          * page of the given title.
 832          */
 833         public function view() {
 834                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 835                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 836                 global $wgUseTrackbacks, $wgUseFileCache;
 837
 838                 wfProfileIn( __METHOD__ );
 839
 840                 # Get variables from query string
 841                 $oldid = $this->getOldID();
 842                 $parserCache = ParserCache::singleton();
 843
 844                 $parserOptions = clone $this->getParserOptions();
 845                 # Render printable version, use printable version cache
 846                 if ( $wgOut->isPrintable() ) {
 847                         $parserOptions->setIsPrintable( true );
 848                 }
 849
 850                 # Try client and file cache
 851                 if ( $oldid === 0 && $this->checkTouched() ) {
 852                         global $wgUseETag;
 853
 854                         if ( $wgUseETag ) {
 855                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 856                         }
 857
 858                         # Is is client cached?
 859                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 860                                 wfDebug( __METHOD__ . ": done 304\n" );
 861                                 wfProfileOut( __METHOD__ );
 862
 863                                 return;
 864                         # Try file cache
 865                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 866                                 wfDebug( __METHOD__ . ": done file cache\n" );
 867                                 # tell wgOut that output is taken care of
 868                                 $wgOut->disable();
 869                                 $this->viewUpdates();
 870                                 wfProfileOut( __METHOD__ );
 871
 872                                 return;
 873                         }
 874                 }
 875
 876                 # getOldID may want us to redirect somewhere else
 877                 if ( $this->mRedirectUrl ) {
 878                         $wgOut->redirect( $this->mRedirectUrl );
 879                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 880                         wfProfileOut( __METHOD__ );
 881
 882                         return;
 883                 }
 884
 885                 $wgOut->setArticleFlag( true );
 886                 # Set page title (may be overridden by DISPLAYTITLE)
 887                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 888
 889                 # If we got diff in the query, we want to see a diff page instead of the article.
 890                 if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
 891                         wfDebug( __METHOD__ . ": showing diff page\n" );
 892                         $this->showDiffPage();
 893                         wfProfileOut( __METHOD__ );
 894
 895                         return;
 896                 }
 897
 898                 # Should the parser cache be used?
 899                 $useParserCache = $this->useParserCache( $oldid );
 900                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 901                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 902                         wfIncrStats( 'pcache_miss_stub' );
 903                 }
 904
 905                 $wasRedirected = $this->showRedirectedFromHeader();
 906                 $this->showNamespaceHeader();
 907
 908                 # Iterate through the possible ways of constructing the output text.
 909                 # Keep going until $outputDone is set, or we run out of things to do.
 910                 $pass = 0;
 911                 $outputDone = false;
 912                 $this->mParserOutput = false;
 913
 914                 while ( !$outputDone && ++$pass ) {
 915                         switch( $pass ) {
 916                                 case 1:
 917                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 918                                         break;
 919                                 case 2:
 920                                         # Try the parser cache
 921                                         if ( $useParserCache ) {
 922                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 923
 924                                                 if ( $this->mParserOutput !== false ) {
 925                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 926                                                         $wgOut->addParserOutput( $this->mParserOutput );
 927                                                         # Ensure that UI elements requiring revision ID have
 928                                                         # the correct version information.
 929                                                         $wgOut->setRevisionId( $this->mLatest );
 930                                                         $outputDone = true;
 931                                                 }
 932                                         }
 933                                         break;
 934                                 case 3:
 935                                         $text = $this->getContent();
 936                                         if ( $text === false || $this->getID() == 0 ) {
 937                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 938                                                 $this->showMissingArticle();
 939                                                 wfProfileOut( __METHOD__ );
 940                                                 return;
 941                                         }
 942
 943                                         # Another whitelist check in case oldid is altering the title
 944                                         if ( !$this->mTitle->userCanRead() ) {
 945                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 946                                                 $wgOut->loginToUse();
 947                                                 $wgOut->output();
 948                                                 $wgOut->disable();
 949                                                 wfProfileOut( __METHOD__ );
 950                                                 return;
 951                                         }
 952
 953                                         # Are we looking at an old revision
 954                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 955                                                 $this->setOldSubtitle( $oldid );
 956
 957                                                 if ( !$this->showDeletedRevisionHeader() ) {
 958                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 959                                                         wfProfileOut( __METHOD__ );
 960                                                         return;
 961                                                 }
 962
 963                                                 # If this "old" version is the current, then try the parser cache...
 964                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 965                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 966                                                         if ( $this->mParserOutput ) {
 967                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 968                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 969                                                                 $wgOut->setRevisionId( $this->mLatest );
 970                                                                 $this->showViewFooter();
 971                                                                 $this->viewUpdates();
 972                                                                 wfProfileOut( __METHOD__ );
 973                                                                 return;
 974                                                         }
 975                                                 }
 976                                         }
 977
 978                                         # Ensure that UI elements requiring revision ID have
 979                                         # the correct version information.
 980                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 981
 982                                         # Pages containing custom CSS or JavaScript get special treatment
 983                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 984                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 985                                                 $this->showCssOrJsPage();
 986                                                 $outputDone = true;
 987                                         } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
 988                                                 wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 989                                                 # Viewing a redirect page (e.g. with parameter redirect=no)
 990                                                 # Don't append the subtitle if this was an old revision
 991                                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 992                                                 # Parse just to get categories, displaytitle, etc.
 993                                                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 994                                                 $wgOut->addParserOutputNoText( $this->mParserOutput );
 995                                                 $outputDone = true;
 996                                         }
 997                                         break;
 998                                 case 4:
 999                                         # Run the parse, protected by a pool counter
1000                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1001                                         $key = $parserCache->getKey( $this, $parserOptions );
1002                                         $poolCounter = PoolCounter::factory( 'Article::view', $key );
1003                                         $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
1004                                         $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
1005
1006                                         if ( !$status->isOK() ) {
1007                                                 # Connection or timeout error
1008                                                 $this->showPoolError( $status );
1009                                                 wfProfileOut( __METHOD__ );
1010                                                 return;
1011                                         } else {
1012                                                 $outputDone = true;
1013                                         }
1014                                         break;
1015                                 # Should be unreachable, but just in case...
1016                                 default:
1017                                         break 2;
1018                         }
1019                 }
1020
1021                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1022                 if ( $this->mParserOutput ) {
1023                         $titleText = $this->mParserOutput->getTitleText();
1024
1025                         if ( strval( $titleText ) !== '' ) {
1026                                 $wgOut->setPageTitle( $titleText );
1027                         }
1028                 }
1029
1030                 # For the main page, overwrite the <title> element with the con-
1031                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1032                 # that's not empty).
1033                 if ( $this->mTitle->equals( Title::newMainPage() )
1034                         && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
1035                 {
1036                         $wgOut->setHTMLTitle( $m );
1037                 }
1038
1039                 # Now that we've filled $this->mParserOutput, we know whether
1040                 # there are any __NOINDEX__ tags on the page
1041                 $policy = $this->getRobotPolicy( 'view' );
1042                 $wgOut->setIndexPolicy( $policy['index'] );
1043                 $wgOut->setFollowPolicy( $policy['follow'] );
1044
1045                 $this->showViewFooter();
1046                 $this->viewUpdates();
1047                 wfProfileOut( __METHOD__ );
1048         }
1049
1050         /**
1051          * Show a diff page according to current request variables. For use within
1052          * Article::view() only, other callers should use the DifferenceEngine class.
1053          */
1054         public function showDiffPage() {
1055                 global $wgOut, $wgRequest, $wgUser;
1056
1057                 $diff = $wgRequest->getVal( 'diff' );
1058                 $rcid = $wgRequest->getVal( 'rcid' );
1059                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1060                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1061                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1062                 $oldid = $this->getOldID();
1063
1064                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1065                 // DifferenceEngine directly fetched the revision:
1066                 $this->mRevIdFetched = $de->mNewid;
1067                 $de->showDiffPage( $diffOnly );
1068
1069                 // Needed to get the page's current revision
1070                 $this->loadPageData();
1071                 if ( $diff == 0 || $diff == $this->mLatest ) {
1072                         # Run view updates for current revision only
1073                         $this->viewUpdates();
1074                 }
1075         }
1076
1077         /**
1078          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1079          * Article::view() only.
1080          *
1081          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1082          * page views.
1083          */
1084         public function showCssOrJsPage() {
1085                 global $wgOut;
1086
1087                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
1088
1089                 // Give hooks a chance to customise the output
1090                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1091                         // Wrap the whole lot in a <pre> and don't parse
1092                         $m = array();
1093                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1094                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1095                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1096                         $wgOut->addHTML( "\n</pre>\n" );
1097                 }
1098         }
1099
1100         /**
1101          * Get the robot policy to be used for the current action=view request.
1102          * @return String the policy that should be set
1103          * @deprecated use getRobotPolicy() instead, which returns an associative
1104          *    array
1105          */
1106         public function getRobotPolicyForView() {
1107                 wfDeprecated( __METHOD__ );
1108                 $policy = $this->getRobotPolicy( 'view' );
1109
1110                 return $policy['index'] . ',' . $policy['follow'];
1111         }
1112
1113         /**
1114          * Get the robot policy to be used for the current view
1115          * @param $action String the action= GET parameter
1116          * @return Array the policy that should be set
1117          * TODO: actions other than 'view'
1118          */
1119         public function getRobotPolicy( $action ) {
1120                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1121                 global $wgDefaultRobotPolicy, $wgRequest;
1122
1123                 $ns = $this->mTitle->getNamespace();
1124
1125                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1126                         # Don't index user and user talk pages for blocked users (bug 11443)
1127                         if ( !$this->mTitle->isSubpage() ) {
1128                                 $block = new Block();
1129                                 if ( $block->load( $this->mTitle->getText() ) ) {
1130                                         return array(
1131                                                 'index'  => 'noindex',
1132                                                 'follow' => 'nofollow'
1133                                         );
1134                                 }
1135                         }
1136                 }
1137
1138                 if ( $this->getID() === 0 || $this->getOldID() ) {
1139                         # Non-articles (special pages etc), and old revisions
1140                         return array(
1141                                 'index'  => 'noindex',
1142                                 'follow' => 'nofollow'
1143                         );
1144                 } elseif ( $wgOut->isPrintable() ) {
1145                         # Discourage indexing of printable versions, but encourage following
1146                         return array(
1147                                 'index'  => 'noindex',
1148                                 'follow' => 'follow'
1149                         );
1150                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1151                         # For ?curid=x urls, disallow indexing
1152                         return array(
1153                                 'index'  => 'noindex',
1154                                 'follow' => 'follow'
1155                         );
1156                 }
1157
1158                 # Otherwise, construct the policy based on the various config variables.
1159                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1160
1161                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1162                         # Honour customised robot policies for this namespace
1163                         $policy = array_merge(
1164                                 $policy,
1165                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1166                         );
1167                 }
1168                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1169                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1170                         # a final sanity check that we have really got the parser output.
1171                         $policy = array_merge(
1172                                 $policy,
1173                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1174                         );
1175                 }
1176
1177                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1178                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1179                         $policy = array_merge(
1180                                 $policy,
1181                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1182                         );
1183                 }
1184
1185                 return $policy;
1186         }
1187
1188         /**
1189          * Converts a String robot policy into an associative array, to allow
1190          * merging of several policies using array_merge().
1191          * @param $policy Mixed, returns empty array on null/false/'', transparent
1192          *            to already-converted arrays, converts String.
1193          * @return associative Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1194          */
1195         public static function formatRobotPolicy( $policy ) {
1196                 if ( is_array( $policy ) ) {
1197                         return $policy;
1198                 } elseif ( !$policy ) {
1199                         return array();
1200                 }
1201
1202                 $policy = explode( ',', $policy );
1203                 $policy = array_map( 'trim', $policy );
1204
1205                 $arr = array();
1206                 foreach ( $policy as $var ) {
1207                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1208                                 $arr['index'] = $var;
1209                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1210                                 $arr['follow'] = $var;
1211                         }
1212                 }
1213
1214                 return $arr;
1215         }
1216
1217         /**
1218          * If this request is a redirect view, send "redirected from" subtitle to
1219          * $wgOut. Returns true if the header was needed, false if this is not a
1220          * redirect view. Handles both local and remote redirects.
1221          *
1222          * @return boolean
1223          */
1224         public function showRedirectedFromHeader() {
1225                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1226
1227                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1228                 $sk = $wgUser->getSkin();
1229
1230                 if ( isset( $this->mRedirectedFrom ) ) {
1231                         // This is an internally redirected page view.
1232                         // We'll need a backlink to the source page for navigation.
1233                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1234                                 $redir = $sk->link(
1235                                         $this->mRedirectedFrom,
1236                                         null,
1237                                         array(),
1238                                         array( 'redirect' => 'no' ),
1239                                         array( 'known', 'noclasses' )
1240                                 );
1241
1242                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1243                                 $wgOut->setSubtitle( $s );
1244
1245                                 // Set the fragment if one was specified in the redirect
1246                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1247                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1248                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1249                                 }
1250
1251                                 // Add a <link rel="canonical"> tag
1252                                 $wgOut->addLink( array( 'rel' => 'canonical',
1253                                         'href' => $this->mTitle->getLocalURL() )
1254                                 );
1255
1256                                 return true;
1257                         }
1258                 } elseif ( $rdfrom ) {
1259                         // This is an externally redirected view, from some other wiki.
1260                         // If it was reported from a trusted site, supply a backlink.
1261                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1262                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
1263                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1264                                 $wgOut->setSubtitle( $s );
1265
1266                                 return true;
1267                         }
1268                 }
1269
1270                 return false;
1271         }
1272
1273         /**
1274          * Show a header specific to the namespace currently being viewed, like
1275          * [[MediaWiki:Talkpagetext]]. For Article::view().
1276          */
1277         public function showNamespaceHeader() {
1278                 global $wgOut;
1279
1280                 if ( $this->mTitle->isTalkPage() ) {
1281                         $msg = wfMsgNoTrans( 'talkpageheader' );
1282                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
1283                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1284                         }
1285                 }
1286         }
1287
1288         /**
1289          * Show the footer section of an ordinary page view
1290          */
1291         public function showViewFooter() {
1292                 global $wgOut, $wgUseTrackbacks, $wgRequest;
1293
1294                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1295                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1296                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1297                 }
1298
1299                 # If we have been passed an &rcid= parameter, we want to give the user a
1300                 # chance to mark this new article as patrolled.
1301                 $this->showPatrolFooter();
1302
1303                 # Trackbacks
1304                 if ( $wgUseTrackbacks ) {
1305                         $this->addTrackbacks();
1306                 }
1307         }
1308
1309         /**
1310          * If patrol is possible, output a patrol UI box. This is called from the
1311          * footer section of ordinary page views. If patrol is not possible or not
1312          * desired, does nothing.
1313          */
1314         public function showPatrolFooter() {
1315                 global $wgOut, $wgRequest, $wgUser;
1316
1317                 $rcid = $wgRequest->getVal( 'rcid' );
1318
1319                 if ( !$rcid || !$this->mTitle->exists() || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1320                         return;
1321                 }
1322
1323                 $sk = $wgUser->getSkin();
1324
1325                 $wgOut->addHTML(
1326                         "<div class='patrollink'>" .
1327                                 wfMsgHtml(
1328                                         'markaspatrolledlink',
1329                                         $sk->link(
1330                                                 $this->mTitle,
1331                                                 wfMsgHtml( 'markaspatrolledtext' ),
1332                                                 array(),
1333                                                 array(
1334                                                         'action' => 'markpatrolled',
1335                                                         'rcid' => $rcid
1336                                                 ),
1337                                                 array( 'known', 'noclasses' )
1338                                         )
1339                                 ) .
1340                         '</div>'
1341                 );
1342         }
1343
1344         /**
1345          * Show the error text for a missing article. For articles in the MediaWiki
1346          * namespace, show the default message text. To be called from Article::view().
1347          */
1348         public function showMissingArticle() {
1349                 global $wgOut, $wgRequest, $wgUser;
1350
1351                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1352                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1353                         $parts = explode( '/', $this->mTitle->getText() );
1354                         $rootPart = $parts[0];
1355                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1356                         $ip = User::isIP( $rootPart );
1357
1358                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1359                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1360                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1361                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1362                                 LogEventsList::showLogExtract(
1363                                         $wgOut,
1364                                         'block',
1365                                         $user->getUserPage()->getPrefixedText(),
1366                                         '',
1367                                         array(
1368                                                 'lim' => 1,
1369                                                 'showIfEmpty' => false,
1370                                                 'msgKey' => array(
1371                                                         'blocked-notice-logextract',
1372                                                         $user->getName() # Support GENDER in notice
1373                                                 )
1374                                         )
1375                                 );
1376                         }
1377                 }
1378
1379                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1380
1381                 # Show delete and move logs
1382                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1383                         array(  'lim' => 10,
1384                                 'conds' => array( "log_action != 'revision'" ),
1385                                 'showIfEmpty' => false,
1386                                 'msgKey' => array( 'moveddeleted-notice' ) )
1387                 );
1388
1389                 # Show error message
1390                 $oldid = $this->getOldID();
1391                 if ( $oldid ) {
1392                         $text = wfMsgNoTrans( 'missing-article',
1393                                 $this->mTitle->getPrefixedText(),
1394                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1395                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1396                         // Use the default message text
1397                         $text = $this->getContent();
1398                 } else {
1399                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1400                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1401                         $errors = array_merge( $createErrors, $editErrors );
1402
1403                         if ( !count( $errors ) ) {
1404                                 $text = wfMsgNoTrans( 'noarticletext' );
1405                         } else {
1406                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1407                         }
1408                 }
1409                 $text = "<div class='noarticletext'>\n$text\n</div>";
1410
1411                 if ( !$this->hasViewableContent() ) {
1412                         // If there's no backing content, send a 404 Not Found
1413                         // for better machine handling of broken links.
1414                         $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
1415                 }
1416
1417                 $wgOut->addWikiText( $text );
1418         }
1419
1420         /**
1421          * If the revision requested for view is deleted, check permissions.
1422          * Send either an error message or a warning header to $wgOut.
1423          *
1424          * @return boolean true if the view is allowed, false if not.
1425          */
1426         public function showDeletedRevisionHeader() {
1427                 global $wgOut, $wgRequest;
1428
1429                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1430                         // Not deleted
1431                         return true;
1432                 }
1433
1434                 // If the user is not allowed to see it...
1435                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1436                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1437                                 'rev-deleted-text-permission' );
1438
1439                         return false;
1440                 // If the user needs to confirm that they want to see it...
1441                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1442                         # Give explanation and add a link to view the revision...
1443                         $oldid = intval( $this->getOldID() );
1444                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1445                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1446                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1447                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1448                                 array( $msg, $link ) );
1449
1450                         return false;
1451                 // We are allowed to see...
1452                 } else {
1453                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1454                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1455                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1456
1457                         return true;
1458                 }
1459         }
1460
1461         /**
1462          * Should the parser cache be used?
1463          *
1464          * @return boolean
1465          */
1466         public function useParserCache( $oldid ) {
1467                 global $wgUser, $wgEnableParserCache;
1468
1469                 return $wgEnableParserCache
1470                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1471                         && $this->exists()
1472                         && empty( $oldid )
1473                         && !$this->mTitle->isCssOrJsPage()
1474                         && !$this->mTitle->isCssJsSubpage();
1475         }
1476
1477         /**
1478          * Execute the uncached parse for action=view
1479          */
1480         public function doViewParse() {
1481                 global $wgOut;
1482
1483                 $oldid = $this->getOldID();
1484                 $useParserCache = $this->useParserCache( $oldid );
1485                 $parserOptions = clone $this->getParserOptions();
1486
1487                 # Render printable version, use printable version cache
1488                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1489
1490                 # Don't show section-edit links on old revisions... this way lies madness.
1491                 $parserOptions->setEditSection( $this->isCurrent() );
1492                 $useParserCache = $this->useParserCache( $oldid );
1493                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1494         }
1495
1496         /**
1497          * Try to fetch an expired entry from the parser cache. If it is present,
1498          * output it and return true. If it is not present, output nothing and
1499          * return false. This is used as a callback function for
1500          * PoolCounter::executeProtected().
1501          *
1502          * @return boolean
1503          */
1504         public function tryDirtyCache() {
1505
1506                 global $wgOut;
1507                 $parserCache = ParserCache::singleton();
1508                 $options = $this->getParserOptions();
1509                 $options->setIsPrintable( $wgOut->isPrintable() );
1510                 $output = $parserCache->getDirty( $this, $options );
1511
1512                 if ( $output ) {
1513                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1514                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1515                         $wgOut->setSquidMaxage( 0 );
1516                         $this->mParserOutput = $output;
1517                         $wgOut->addParserOutput( $output );
1518                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1519
1520                         return true;
1521                 } else {
1522                         wfDebugLog( 'dirty', "dirty missing\n" );
1523                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1524
1525                         return false;
1526                 }
1527         }
1528
1529         /**
1530          * Show an error page for an error from the pool counter.
1531          * @param $status Status
1532          */
1533         public function showPoolError( $status ) {
1534                 global $wgOut;
1535
1536                 $wgOut->clearHTML(); // for release() errors
1537                 $wgOut->enableClientCache( false );
1538                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1539                 $wgOut->addWikiText(
1540                         '<div class="errorbox">' .
1541                         $status->getWikiText( false, 'view-pool-error' ) .
1542                         '</div>'
1543                 );
1544         }
1545
1546         /**
1547          * View redirect
1548          *
1549          * @param $target Title object or Array of destination(s) to redirect
1550          * @param $appendSubtitle Boolean [optional]
1551          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1552          * @return string containing HMTL with redirect link
1553          */
1554         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1555                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1556
1557                 # Display redirect
1558                 if ( !is_array( $target ) ) {
1559                         $target = array( $target );
1560                 }
1561
1562                 $imageDir = $wgContLang->getDir();
1563                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1564                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1565                 $alt2 = $wgContLang->isRTL() ? '←' : '→'; // should -> and <- be used instead of Unicode?
1566
1567                 if ( $appendSubtitle ) {
1568                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1569                 }
1570
1571                 $sk = $wgUser->getSkin();
1572                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1573                 $title = array_shift( $target );
1574
1575                 if ( $forceKnown ) {
1576                         $link = $sk->link(
1577                                 $title,
1578                                 htmlspecialchars( $title->getFullText() ),
1579                                 array(),
1580                                 array(),
1581                                 array( 'known', 'noclasses' )
1582                         );
1583                 } else {
1584                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1585                 }
1586
1587                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1588                 foreach ( $target as $rt ) {
1589                         if ( $forceKnown ) {
1590                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1591                                         . $sk->link(
1592                                                 $rt,
1593                                                 htmlspecialchars( $rt->getFullText() ),
1594                                                 array(),
1595                                                 array(),
1596                                                 array( 'known', 'noclasses' )
1597                                         );
1598                         } else {
1599                                 $link .= '<img src="' . $imageUrl2 . '" alt="' . $alt2 . ' " />'
1600                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1601                         }
1602                 }
1603
1604                 return '<img src="' . $imageUrl . '" alt="#REDIRECT " />' .
1605                         '<span class="redirectText">' . $link . '</span>';
1606         }
1607
1608         /**
1609          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1610          */
1611         public function addTrackbacks() {
1612                 global $wgOut, $wgUser;
1613
1614                 $dbr = wfGetDB( DB_SLAVE );
1615                 $tbs = $dbr->select( 'trackbacks',
1616                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1617                         array( 'tb_page' => $this->getID() )
1618                 );
1619
1620                 if ( !$dbr->numRows( $tbs ) ) {
1621                         return;
1622                 }
1623
1624                 $tbtext = "";
1625                 while ( $o = $dbr->fetchObject( $tbs ) ) {
1626                         $rmvtxt = "";
1627
1628                         if ( $wgUser->isAllowed( 'trackback' ) ) {
1629                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1630                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1631                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1632                         }
1633
1634                         $tbtext .= "\n";
1635                         $tbtext .= wfMsg( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1636                                         $o->tb_title,
1637                                         $o->tb_url,
1638                                         $o->tb_ex,
1639                                         $o->tb_name,
1640                                         $rmvtxt );
1641                 }
1642
1643                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1644         }
1645
1646         /**
1647          * Removes trackback record for current article from trackbacks table
1648          */
1649         public function deletetrackback() {
1650                 global $wgUser, $wgRequest, $wgOut;
1651
1652                 if ( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1653                         $wgOut->addWikiMsg( 'sessionfailure' );
1654
1655                         return;
1656                 }
1657
1658                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1659
1660                 if ( count( $permission_errors ) ) {
1661                         $wgOut->showPermissionsErrorPage( $permission_errors );
1662
1663                         return;
1664                 }
1665
1666                 $db = wfGetDB( DB_MASTER );
1667                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1668
1669                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1670                 $this->mTitle->invalidateCache();
1671         }
1672
1673         /**
1674          * Handle action=render
1675          */
1676
1677         public function render() {
1678                 global $wgOut;
1679
1680                 $wgOut->setArticleBodyOnly( true );
1681                 $this->view();
1682         }
1683
1684         /**
1685          * Handle action=purge
1686          */
1687         public function purge() {
1688                 global $wgUser, $wgRequest, $wgOut;
1689
1690                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1691                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1692                                 $this->doPurge();
1693                                 $this->view();
1694                         }
1695                 } else {
1696                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1697                         $button = wfMsgExt( 'confirm_purge_button', array( 'escapenoentities' ) );
1698                         $form = "<form method=\"post\" action=\"$action\">\n" .
1699                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1700                                         "</form>\n";
1701                         $top = wfMsgExt( 'confirm-purge-top', array( 'parse' ) );
1702                         $bottom = wfMsgExt( 'confirm-purge-bottom', array( 'parse' ) );
1703                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1704                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1705                         $wgOut->addHTML( $top . $form . $bottom );
1706                 }
1707         }
1708
1709         /**
1710          * Perform the actions of a page purging
1711          */
1712         public function doPurge() {
1713                 global $wgUseSquid;
1714
1715                 // Invalidate the cache
1716                 $this->mTitle->invalidateCache();
1717
1718                 if ( $wgUseSquid ) {
1719                         // Commit the transaction before the purge is sent
1720                         $dbw = wfGetDB( DB_MASTER );
1721                         $dbw->commit();
1722
1723                         // Send purge
1724                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1725                         $update->doUpdate();
1726                 }
1727
1728                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1729                         global $wgMessageCache;
1730
1731                         if ( $this->getID() == 0 ) {
1732                                 $text = false;
1733                         } else {
1734                                 $text = $this->getRawText();
1735                         }
1736
1737                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1738                 }
1739         }
1740
1741         /**
1742          * Insert a new empty page record for this article.
1743          * This *must* be followed up by creating a revision
1744          * and running $this->updateRevisionOn( ... );
1745          * or else the record will be left in a funky state.
1746          * Best if all done inside a transaction.
1747          *
1748          * @param $dbw Database
1749          * @return int The newly created page_id key, or false if the title already existed
1750          * @private
1751          */
1752         public function insertOn( $dbw ) {
1753                 wfProfileIn( __METHOD__ );
1754
1755                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1756                 $dbw->insert( 'page', array(
1757                         'page_id'           => $page_id,
1758                         'page_namespace'    => $this->mTitle->getNamespace(),
1759                         'page_title'        => $this->mTitle->getDBkey(),
1760                         'page_counter'      => 0,
1761                         'page_restrictions' => '',
1762                         'page_is_redirect'  => 0, # Will set this shortly...
1763                         'page_is_new'       => 1,
1764                         'page_random'       => wfRandom(),
1765                         'page_touched'      => $dbw->timestamp(),
1766                         'page_latest'       => 0, # Fill this in shortly...
1767                         'page_len'          => 0, # Fill this in shortly...
1768                 ), __METHOD__, 'IGNORE' );
1769
1770                 $affected = $dbw->affectedRows();
1771
1772                 if ( $affected ) {
1773                         $newid = $dbw->insertId();
1774                         $this->mTitle->resetArticleId( $newid );
1775                 }
1776                 wfProfileOut( __METHOD__ );
1777
1778                 return $affected ? $newid : false;
1779         }
1780
1781         /**
1782          * Update the page record to point to a newly saved revision.
1783          *
1784          * @param $dbw Database object
1785          * @param $revision Revision: For ID number, and text used to set
1786                             length and redirect status fields
1787          * @param $lastRevision Integer: if given, will not overwrite the page field
1788          *                      when different from the currently set value.
1789          *                      Giving 0 indicates the new page flag should be set
1790          *                      on.
1791          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1792          *                           removing rows in redirect table.
1793          * @return bool true on success, false on failure
1794          * @private
1795          */
1796         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1797                 wfProfileIn( __METHOD__ );
1798
1799                 $text = $revision->getText();
1800                 $rt = Title::newFromRedirect( $text );
1801
1802                 $conditions = array( 'page_id' => $this->getId() );
1803
1804                 if ( !is_null( $lastRevision ) ) {
1805                         # An extra check against threads stepping on each other
1806                         $conditions['page_latest'] = $lastRevision;
1807                 }
1808
1809                 $dbw->update( 'page',
1810                         array( /* SET */
1811                                 'page_latest'      => $revision->getId(),
1812                                 'page_touched'     => $dbw->timestamp(),
1813                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1814                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1815                                 'page_len'         => strlen( $text ),
1816                         ),
1817                         $conditions,
1818                         __METHOD__ );
1819
1820                 $result = $dbw->affectedRows() != 0;
1821                 if ( $result ) {
1822                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1823                 }
1824
1825                 wfProfileOut( __METHOD__ );
1826                 return $result;
1827         }
1828
1829         /**
1830          * Add row to the redirect table if this is a redirect, remove otherwise.
1831          *
1832          * @param $dbw Database
1833          * @param $redirectTitle a title object pointing to the redirect target,
1834          *                       or NULL if this is not a redirect
1835          * @param $lastRevIsRedirect If given, will optimize adding and
1836          *                           removing rows in redirect table.
1837          * @return bool true on success, false on failure
1838          * @private
1839          */
1840         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1841                 // Always update redirects (target link might have changed)
1842                 // Update/Insert if we don't know if the last revision was a redirect or not
1843                 // Delete if changing from redirect to non-redirect
1844                 $isRedirect = !is_null( $redirectTitle );
1845
1846                 if ( $isRedirect || is_null( $lastRevIsRedirect ) || $lastRevIsRedirect !== $isRedirect ) {
1847                         wfProfileIn( __METHOD__ );
1848                         if ( $isRedirect ) {
1849                                 // This title is a redirect, Add/Update row in the redirect table
1850                                 $set = array( /* SET */
1851                                         'rd_namespace' => $redirectTitle->getNamespace(),
1852                                         'rd_title'     => $redirectTitle->getDBkey(),
1853                                         'rd_from'      => $this->getId(),
1854                                 );
1855                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1856                         } else {
1857                                 // This is not a redirect, remove row from redirect table
1858                                 $where = array( 'rd_from' => $this->getId() );
1859                                 $dbw->delete( 'redirect', $where, __METHOD__ );
1860                         }
1861
1862                         if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1863                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1864                         }
1865                         wfProfileOut( __METHOD__ );
1866
1867                         return ( $dbw->affectedRows() != 0 );
1868                 }
1869
1870                 return true;
1871         }
1872
1873         /**
1874          * If the given revision is newer than the currently set page_latest,
1875          * update the page record. Otherwise, do nothing.
1876          *
1877          * @param $dbw Database object
1878          * @param $revision Revision object
1879          * @return mixed
1880          */
1881         public function updateIfNewerOn( &$dbw, $revision ) {
1882                 wfProfileIn( __METHOD__ );
1883
1884                 $row = $dbw->selectRow(
1885                         array( 'revision', 'page' ),
1886                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1887                         array(
1888                                 'page_id' => $this->getId(),
1889                                 'page_latest=rev_id' ),
1890                         __METHOD__ );
1891
1892                 if ( $row ) {
1893                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1894                                 wfProfileOut( __METHOD__ );
1895                                 return false;
1896                         }
1897                         $prev = $row->rev_id;
1898                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1899                 } else {
1900                         # No or missing previous revision; mark the page as new
1901                         $prev = 0;
1902                         $lastRevIsRedirect = null;
1903                 }
1904
1905                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1906
1907                 wfProfileOut( __METHOD__ );
1908                 return $ret;
1909         }
1910
1911         /**
1912          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1913          * @param $text String: new text of the section
1914          * @param $summary String: new section's subject, only if $section is 'new'
1915          * @param $edittime String: revision timestamp or null to use the current revision
1916          * @return string Complete article text, or null if error
1917          */
1918         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1919                 wfProfileIn( __METHOD__ );
1920
1921                 if ( strval( $section ) == '' ) {
1922                         // Whole-page edit; let the whole text through
1923                 } else {
1924                         if ( is_null( $edittime ) ) {
1925                                 $rev = Revision::newFromTitle( $this->mTitle );
1926                         } else {
1927                                 $dbw = wfGetDB( DB_MASTER );
1928                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1929                         }
1930
1931                         if ( !$rev ) {
1932                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1933                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1934                                 return null;
1935                         }
1936
1937                         $oldtext = $rev->getText();
1938
1939                         if ( $section == 'new' ) {
1940                                 # Inserting a new section
1941                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1942                                 $text = strlen( trim( $oldtext ) ) > 0
1943                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1944                                                 : "{$subject}{$text}";
1945                         } else {
1946                                 # Replacing an existing section; roll out the big guns
1947                                 global $wgParser;
1948
1949                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1950                         }
1951                 }
1952
1953                 wfProfileOut( __METHOD__ );
1954                 return $text;
1955         }
1956
1957         /**
1958          * This function is not deprecated until somebody fixes the core not to use
1959          * it. Nevertheless, use Article::doEdit() instead.
1960          */
1961         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC = false, $comment = false, $bot = false ) {
1962                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1963                         ( $isminor ? EDIT_MINOR : 0 ) |
1964                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1965                         ( $bot ? EDIT_FORCE_BOT : 0 );
1966
1967                 $this->doEdit( $text, $summary, $flags, false, null, $watchthis, $comment, '', true );
1968         }
1969
1970         /**
1971          * @deprecated use Article::doEdit()
1972          */
1973         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1974                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1975                         ( $minor ? EDIT_MINOR : 0 ) |
1976                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1977
1978                 $status = $this->doEdit( $text, $summary, $flags, false, null, $watchthis, false, $sectionanchor, true );
1979
1980                 if ( !$status->isOK() ) {
1981                         return false;
1982                 }
1983
1984                 return true;
1985         }
1986
1987         /**
1988          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1989          * @param $flags Int
1990          * @return Int updated $flags
1991          */
1992         function checkFlags( $flags ) {
1993                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1994                         if ( $this->mTitle->getArticleID() ) {
1995                                 $flags |= EDIT_UPDATE;
1996                         } else {
1997                                 $flags |= EDIT_NEW;
1998                         }
1999                 }
2000
2001                 return $flags;
2002         }
2003
2004         /**
2005          * Article::doEdit()
2006          *
2007          * Change an existing article or create a new article. Updates RC and all necessary caches,
2008          * optionally via the deferred update array.
2009          *
2010          * $wgUser must be set before calling this function.
2011          *
2012          * @param $text String: new text
2013          * @param $summary String: edit summary
2014          * @param $flags Integer bitfield:
2015          *      EDIT_NEW
2016          *          Article is known or assumed to be non-existent, create a new one
2017          *      EDIT_UPDATE
2018          *          Article is known or assumed to be pre-existing, update it
2019          *      EDIT_MINOR
2020          *          Mark this edit minor, if the user is allowed to do so
2021          *      EDIT_SUPPRESS_RC
2022          *          Do not log the change in recentchanges
2023          *      EDIT_FORCE_BOT
2024          *          Mark the edit a "bot" edit regardless of user rights
2025          *      EDIT_DEFER_UPDATES
2026          *          Defer some of the updates until the end of index.php
2027          *      EDIT_AUTOSUMMARY
2028          *          Fill in blank summaries with generated text where possible
2029          *
2030          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
2031          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
2032          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
2033          * edit-already-exists error will be returned. These two conditions are also possible with
2034          * auto-detection due to MediaWiki's performance-optimised locking strategy.
2035          *
2036          * @param $baseRevId the revision ID this edit was based off, if any
2037          * @param $user Optional user object, $wgUser will be used if not passed
2038          * @param $watchthis Watch the page if true, unwatch the page if false, do nothing if null
2039          * @param $sectionanchor The section anchor for the page; used for redirecting the user back to the page
2040          *              after the edit is successfully committed
2041          * @param $redirect If true, redirect the user back to the page after the edit is successfully committed
2042          *
2043          * @return Status object. Possible errors:
2044          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
2045          *     edit-gone-missing:       In update mode, but the article didn't exist
2046          *     edit-conflict:           In update mode, the article changed unexpectedly
2047          *     edit-no-change:          Warning that the text was the same as before
2048          *     edit-already-exists:     In creation mode, but the article already exists
2049          *
2050          *  Extensions may define additional errors.
2051          *
2052          *  $return->value will contain an associative array with members as follows:
2053          *     new:                     Boolean indicating if the function attempted to create a new article
2054          *     revision:                The revision object for the inserted revision, or null
2055          *
2056          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2057          */
2058         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null , $watchthis = null,
2059                         $comment = false, $sectionanchor = '', $redirect = false) {
2060                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2061
2062                 # Low-level sanity check
2063                 if ( $this->mTitle->getText() == '' ) {
2064                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2065                 }
2066
2067                 wfProfileIn( __METHOD__ );
2068
2069                 $user = is_null( $user ) ? $wgUser : $user;
2070                 $status = Status::newGood( array() );
2071
2072                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2073                 $this->loadPageData();
2074
2075                 $flags = $this->checkFlags( $flags );
2076
2077                 # If this is a comment, add the summary as headline
2078                 if ( $comment && $summary != "" ) {
2079                         $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" . $text;
2080                 }
2081
2082                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2083                         $flags & EDIT_MINOR, &$watchthis, null, &$flags, &$status) ) )
2084                 {
2085                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2086                         wfProfileOut( __METHOD__ );
2087
2088                         if ( $status->isOK() ) {
2089                                 $status->fatal( 'edit-hook-aborted' );
2090                         }
2091
2092                         return $status;
2093                 }
2094
2095                 # Silently ignore EDIT_MINOR if not allowed
2096                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2097                 $bot = $flags & EDIT_FORCE_BOT;
2098
2099                 $oldtext = $this->getRawText(); // current revision
2100                 $oldsize = strlen( $oldtext );
2101
2102                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2103                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2104                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2105                 }
2106
2107                 $editInfo = $this->prepareTextForEdit( $text );
2108                 $text = $editInfo->pst;
2109                 $newsize = strlen( $text );
2110
2111                 $dbw = wfGetDB( DB_MASTER );
2112                 $now = wfTimestampNow();
2113                 $this->mTimestamp = $now;
2114
2115                 if ( $flags & EDIT_UPDATE ) {
2116                         # Update article, but only if changed.
2117                         $status->value['new'] = false;
2118
2119                         # Make sure the revision is either completely inserted or not inserted at all
2120                         if ( !$wgDBtransactions ) {
2121                                 $userAbort = ignore_user_abort( true );
2122                         }
2123
2124                         $revisionId = 0;
2125
2126                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2127
2128                         if ( $changed ) {
2129                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2130                                   - (int)$this->isCountable( $oldtext );
2131                                 $this->mTotalAdjustment = 0;
2132
2133                                 if ( !$this->mLatest ) {
2134                                         # Article gone missing
2135                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2136                                         $status->fatal( 'edit-gone-missing' );
2137
2138                                         wfProfileOut( __METHOD__ );
2139                                         return $status;
2140                                 }
2141
2142                                 $revision = new Revision( array(
2143                                         'page'       => $this->getId(),
2144                                         'comment'    => $summary,
2145                                         'minor_edit' => $isminor,
2146                                         'text'       => $text,
2147                                         'parent_id'  => $this->mLatest,
2148                                         'user'       => $user->getId(),
2149                                         'user_text'  => $user->getName(),
2150                                 ) );
2151
2152                                 $dbw->begin();
2153                                 $revisionId = $revision->insertOn( $dbw );
2154
2155                                 # Update page
2156                                 #
2157                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2158                                 # during the course of this function. This makes sure that EditPage can detect
2159                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2160                                 # before this function is called. A previous function used a separate query, this
2161                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2162                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2163
2164                                 if ( !$ok ) {
2165                                         /* Belated edit conflict! Run away!! */
2166                                         $status->fatal( 'edit-conflict' );
2167
2168                                         # Delete the invalid revision if the DB is not transactional
2169                                         if ( !$wgDBtransactions ) {
2170                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2171                                         }
2172
2173                                         $revisionId = 0;
2174                                         $dbw->rollback();
2175                                 } else {
2176                                         global $wgUseRCPatrol;
2177                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2178                                         # Update recentchanges
2179                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2180                                                 # Mark as patrolled if the user can do so
2181                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan( 'autopatrol' );
2182                                                 # Add RC row to the DB
2183                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2184                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2185                                                         $revisionId, $patrolled
2186                                                 );
2187
2188                                                 # Log auto-patrolled edits
2189                                                 if ( $patrolled ) {
2190                                                         PatrolLog::record( $rc, true );
2191                                                 }
2192                                         }
2193                                         $user->incEditCount();
2194                                         $dbw->commit();
2195                                 }
2196                         } else {
2197                                 $status->warning( 'edit-no-change' );
2198                                 $revision = null;
2199                                 // Keep the same revision ID, but do some updates on it
2200                                 $revisionId = $this->getRevIdFetched();
2201                                 // Update page_touched, this is usually implicit in the page update
2202                                 // Other cache updates are done in onArticleEdit()
2203                                 $this->mTitle->invalidateCache();
2204                         }
2205
2206                         if ( !$wgDBtransactions ) {
2207                                 ignore_user_abort( $userAbort );
2208                         }
2209
2210                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2211                         if ( !$status->isOK() ) {
2212                                 wfProfileOut( __METHOD__ );
2213                                 return $status;
2214                         }
2215
2216                         # Invalidate cache of this article and all pages using this article
2217                         # as a template. Partly deferred.
2218                         Article::onArticleEdit( $this->mTitle );
2219                         # Update links tables, site stats, etc.
2220                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
2221                 } else {
2222                         # Create new article
2223                         $status->value['new'] = true;
2224
2225                         # Set statistics members
2226                         # We work out if it's countable after PST to avoid counter drift
2227                         # when articles are created with {{subst:}}
2228                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2229                         $this->mTotalAdjustment = 1;
2230
2231                         $dbw->begin();
2232
2233                         # Add the page record; stake our claim on this title!
2234                         # This will return false if the article already exists
2235                         $newid = $this->insertOn( $dbw );
2236
2237                         if ( $newid === false ) {
2238                                 $dbw->rollback();
2239                                 $status->fatal( 'edit-already-exists' );
2240
2241                                 wfProfileOut( __METHOD__ );
2242                                 return $status;
2243                         }
2244
2245                         # Save the revision text...
2246                         $revision = new Revision( array(
2247                                 'page'       => $newid,
2248                                 'comment'    => $summary,
2249                                 'minor_edit' => $isminor,
2250                                 'text'       => $text,
2251                                 'user'       => $user->getId(),
2252                                 'user_text'  => $user->getName(),
2253                                 ) );
2254                         $revisionId = $revision->insertOn( $dbw );
2255
2256                         $this->mTitle->resetArticleID( $newid );
2257
2258                         # Update the page record with revision data
2259                         $this->updateRevisionOn( $dbw, $revision, 0 );
2260
2261                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2262
2263                         # Update recentchanges
2264                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2265                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2266
2267                                 # Mark as patrolled if the user can do so
2268                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && $this->mTitle->userCan( 'autopatrol' );
2269                                 # Add RC row to the DB
2270                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2271                                         '', strlen( $text ), $revisionId, $patrolled );
2272
2273                                 # Log auto-patrolled edits
2274                                 if ( $patrolled ) {
2275                                         PatrolLog::record( $rc, true );
2276                                 }
2277                         }
2278                         $user->incEditCount();
2279                         $dbw->commit();
2280
2281                         # Update links, etc.
2282                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
2283
2284                         # Clear caches
2285                         Article::onArticleCreate( $this->mTitle );
2286
2287                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2288                                 $flags & EDIT_MINOR, &$watchthis, null, &$flags, $revision ) );
2289                 }
2290
2291                 # Do updates right now unless deferral was requested
2292                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2293                         wfDoUpdates();
2294                 }
2295
2296                 // Return the new revision (or null) to the caller
2297                 $status->value['revision'] = $revision;
2298
2299                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2300                         $flags & EDIT_MINOR, &$watchthis, null, &$flags, $revision, &$status, $baseRevId,
2301                         &$redirect) );
2302
2303                 # Watch or unwatch the page
2304                 if ( $watchthis === true ) {
2305                         if ( !$this->mTitle->userIsWatching() ) {
2306                                 $dbw->begin();
2307                                 $this->doWatch();
2308                                 $dbw->commit();
2309                         }
2310                 } elseif ( $watchthis === false ) {
2311                         if ( $this->mTitle->userIsWatching() ) {
2312                                 $dbw->begin();
2313                                 $this->doUnwatch();
2314                                 $dbw->commit();
2315                         }
2316                 }
2317
2318                 # Give extensions a chance to modify URL query on update
2319                 $extraQuery = '';
2320
2321                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
2322
2323                 if ( $redirect ) {
2324                         if ( $sectionanchor || $extraQuery ) {
2325                                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
2326                         } else {
2327                                 $this->doRedirect( $this->isRedirect( $text ) );
2328                         }
2329                 }
2330
2331                 wfProfileOut( __METHOD__ );
2332
2333                 return $status;
2334         }
2335
2336         /**
2337          * @deprecated wrapper for doRedirect
2338          */
2339         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
2340                 wfDeprecated( __METHOD__ );
2341                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
2342         }
2343
2344         /**
2345          * Output a redirect back to the article.
2346          * This is typically used after an edit.
2347          *
2348          * @param $noRedir Boolean: add redirect=no
2349          * @param $sectionAnchor String: section to redirect to, including "#"
2350          * @param $extraQuery String: extra query params
2351          */
2352         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2353                 global $wgOut;
2354
2355                 if ( $noRedir ) {
2356                         $query = 'redirect=no';
2357                         if ( $extraQuery )
2358                                 $query .= "&$query";
2359                 } else {
2360                         $query = $extraQuery;
2361                 }
2362
2363                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2364         }
2365
2366         /**
2367          * Mark this particular edit/page as patrolled
2368          */
2369         public function markpatrolled() {
2370                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
2371
2372                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2373
2374                 # If we haven't been given an rc_id value, we can't do anything
2375                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2376                 $rc = RecentChange::newFromId( $rcid );
2377
2378                 if ( is_null( $rc ) ) {
2379                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2380                         return;
2381                 }
2382
2383                 # It would be nice to see where the user had actually come from, but for now just guess
2384                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2385                 $return = SpecialPage::getTitleFor( $returnto );
2386
2387                 $dbw = wfGetDB( DB_MASTER );
2388                 $errors = $rc->doMarkPatrolled();
2389
2390                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2391                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2392
2393                         return;
2394                 }
2395
2396                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2397                         // The hook itself has handled any output
2398                         return;
2399                 }
2400
2401                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2402                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2403                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2404                         $wgOut->returnToMain( false, $return );
2405
2406                         return;
2407                 }
2408
2409                 if ( !empty( $errors ) ) {
2410                         $wgOut->showPermissionsErrorPage( $errors );
2411
2412                         return;
2413                 }
2414
2415                 # Inform the user
2416                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2417                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2418                 $wgOut->returnToMain( false, $return );
2419         }
2420
2421         /**
2422          * User-interface handler for the "watch" action
2423          */
2424         public function watch() {
2425                 global $wgUser, $wgOut;
2426
2427                 if ( $wgUser->isAnon() ) {
2428                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2429                         return;
2430                 }
2431
2432                 if ( wfReadOnly() ) {
2433                         $wgOut->readOnlyPage();
2434                         return;
2435                 }
2436
2437                 if ( $this->doWatch() ) {
2438                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2439                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2440                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2441                 }
2442
2443                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2444         }
2445
2446         /**
2447          * Add this page to $wgUser's watchlist
2448          * @return bool true on successful watch operation
2449          */
2450         public function doWatch() {
2451                 global $wgUser;
2452
2453                 if ( $wgUser->isAnon() ) {
2454                         return false;
2455                 }
2456
2457                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2458                         $wgUser->addWatch( $this->mTitle );
2459                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2460                 }
2461
2462                 return false;
2463         }
2464
2465         /**
2466          * User interface handler for the "unwatch" action.
2467          */
2468         public function unwatch() {
2469                 global $wgUser, $wgOut;
2470
2471                 if ( $wgUser->isAnon() ) {
2472                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2473                         return;
2474                 }
2475
2476                 if ( wfReadOnly() ) {
2477                         $wgOut->readOnlyPage();
2478                         return;
2479                 }
2480
2481                 if ( $this->doUnwatch() ) {
2482                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2483                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2484                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2485                 }
2486
2487                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2488         }
2489
2490         /**
2491          * Stop watching a page
2492          * @return bool true on successful unwatch
2493          */
2494         public function doUnwatch() {
2495                 global $wgUser;
2496
2497                 if ( $wgUser->isAnon() ) {
2498                         return false;
2499                 }
2500
2501                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2502                         $wgUser->removeWatch( $this->mTitle );
2503                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2504                 }
2505
2506                 return false;
2507         }
2508
2509         /**
2510          * action=protect handler
2511          */
2512         public function protect() {
2513                 $form = new ProtectionForm( $this );
2514                 $form->execute();
2515         }
2516
2517         /**
2518          * action=unprotect handler (alias)
2519          */
2520         public function unprotect() {
2521                 $this->protect();
2522         }
2523
2524         /**
2525          * Update the article's restriction field, and leave a log entry.
2526          *
2527          * @param $limit Array: set of restriction keys
2528          * @param $reason String
2529          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2530          * @param $expiry Array: per restriction type expiration
2531          * @return bool true on success
2532          */
2533         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2534                 global $wgUser, $wgContLang;
2535
2536                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2537
2538                 $id = $this->mTitle->getArticleID();
2539
2540                 if ( $id <= 0 ) {
2541                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
2542                         return false;
2543                 }
2544
2545                 if ( wfReadOnly() ) {
2546                         wfDebug( "updateRestrictions failed: read-only\n" );
2547                         return false;
2548                 }
2549
2550                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2551                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2552                         return false;
2553                 }
2554
2555                 if ( !$cascade ) {
2556                         $cascade = false;
2557                 }
2558
2559                 // Take this opportunity to purge out expired restrictions
2560                 Title::purgeExpiredRestrictions();
2561
2562                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2563                 # we expect a single selection, but the schema allows otherwise.
2564                 $current = array();
2565                 $updated = Article::flattenRestrictions( $limit );
2566                 $changed = false;
2567
2568                 foreach ( $restrictionTypes as $action ) {
2569                         if ( isset( $expiry[$action] ) ) {
2570                                 # Get current restrictions on $action
2571                                 $aLimits = $this->mTitle->getRestrictions( $action );
2572                                 $current[$action] = implode( '', $aLimits );
2573                                 # Are any actual restrictions being dealt with here?
2574                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2575
2576                                 # If something changed, we need to log it. Checking $aRChanged
2577                                 # assures that "unprotecting" a page that is not protected does
2578                                 # not log just because the expiry was "changed".
2579                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2580                                         $changed = true;
2581                                 }
2582                         }
2583                 }
2584
2585                 $current = Article::flattenRestrictions( $current );
2586
2587                 $changed = ( $changed || $current != $updated );
2588                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2589                 $protect = ( $updated != '' );
2590
2591                 # If nothing's changed, do nothing
2592                 if ( $changed ) {
2593                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2594                                 $dbw = wfGetDB( DB_MASTER );
2595
2596                                 # Prepare a null revision to be added to the history
2597                                 $modified = $current != '' && $protect;
2598
2599                                 if ( $protect ) {
2600                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2601                                 } else {
2602                                         $comment_type = 'unprotectedarticle';
2603                                 }
2604
2605                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2606
2607                                 # Only restrictions with the 'protect' right can cascade...
2608                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2609                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2610
2611                                 # The schema allows multiple restrictions
2612                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2613                                         $cascade = false;
2614                                 }
2615
2616                                 $cascade_description = '';
2617
2618                                 if ( $cascade ) {
2619                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2620                                 }
2621
2622                                 if ( $reason ) {
2623                                         $comment .= ": $reason";
2624                                 }
2625
2626                                 $editComment = $comment;
2627                                 $encodedExpiry = array();
2628                                 $protect_description = '';
2629                                 foreach ( $limit as $action => $restrictions ) {
2630                                         if ( !isset( $expiry[$action] ) )
2631                                                 $expiry[$action] = 'infinite';
2632
2633                                         $encodedExpiry[$action] = Block::encodeExpiry( $expiry[$action], $dbw );
2634                                         if ( $restrictions != '' ) {
2635                                                 $protect_description .= "[$action=$restrictions] (";
2636                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2637                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2638                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2639                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2640                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2641                                                 } else {
2642                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2643                                                 }
2644
2645                                                 $protect_description .= ') ';
2646                                         }
2647                                 }
2648                                 $protect_description = trim( $protect_description );
2649
2650                                 if ( $protect_description && $protect ) {
2651                                         $editComment .= " ($protect_description)";
2652                                 }
2653
2654                                 if ( $cascade ) {
2655                                         $editComment .= "$cascade_description";
2656                                 }
2657
2658                                 # Update restrictions table
2659                                 foreach ( $limit as $action => $restrictions ) {
2660                                         if ( $restrictions != '' ) {
2661                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2662                                                         array( 'pr_page' => $id,
2663                                                                 'pr_type' => $action,
2664                                                                 'pr_level' => $restrictions,
2665                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2666                                                                 'pr_expiry' => $encodedExpiry[$action]
2667                                                         ),
2668                                                         __METHOD__
2669                                                 );
2670                                         } else {
2671                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2672                                                         'pr_type' => $action ), __METHOD__ );
2673                                         }
2674                                 }
2675
2676                                 # Insert a null revision
2677                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2678                                 $nullRevId = $nullRevision->insertOn( $dbw );
2679
2680                                 $latest = $this->getLatest();
2681                                 # Update page record
2682                                 $dbw->update( 'page',
2683                                         array( /* SET */
2684                                                 'page_touched' => $dbw->timestamp(),
2685                                                 'page_restrictions' => '',
2686                                                 'page_latest' => $nullRevId
2687                                         ), array( /* WHERE */
2688                                                 'page_id' => $id
2689                                         ), 'Article::protect'
2690                                 );
2691
2692                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2693                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2694
2695                                 # Update the protection log
2696                                 $log = new LogPage( 'protect' );
2697                                 if ( $protect ) {
2698                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2699                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2700                                 } else {
2701                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2702                                 }
2703                         } # End hook
2704                 } # End "changed" check
2705
2706                 return true;
2707         }
2708
2709         /**
2710          * Take an array of page restrictions and flatten it to a string
2711          * suitable for insertion into the page_restrictions field.
2712          * @param $limit Array
2713          * @return String
2714          */
2715         protected static function flattenRestrictions( $limit ) {
2716                 if ( !is_array( $limit ) ) {
2717                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2718                 }
2719
2720                 $bits = array();
2721                 ksort( $limit );
2722
2723                 foreach ( $limit as $action => $restrictions ) {
2724                         if ( $restrictions != '' ) {
2725                                 $bits[] = "$action=$restrictions";
2726                         }
2727                 }
2728
2729                 return implode( ':', $bits );
2730         }
2731
2732         /**
2733          * Auto-generates a deletion reason
2734          *
2735          * @param &$hasHistory Boolean: whether the page has a history
2736          * @return mixed String containing deletion reason or empty string, or boolean false
2737          *    if no revision occurred
2738          */
2739         public function generateReason( &$hasHistory ) {
2740                 global $wgContLang;
2741
2742                 $dbw = wfGetDB( DB_MASTER );
2743                 // Get the last revision
2744                 $rev = Revision::newFromTitle( $this->mTitle );
2745
2746                 if ( is_null( $rev ) ) {
2747                         return false;
2748                 }
2749
2750                 // Get the article's contents
2751                 $contents = $rev->getText();
2752                 $blank = false;
2753
2754                 // If the page is blank, use the text from the previous revision,
2755                 // which can only be blank if there's a move/import/protect dummy revision involved
2756                 if ( $contents == '' ) {
2757                         $prev = $rev->getPrevious();
2758
2759                         if ( $prev )    {
2760                                 $contents = $prev->getText();
2761                                 $blank = true;
2762                         }
2763                 }
2764
2765                 // Find out if there was only one contributor
2766                 // Only scan the last 20 revisions
2767                 $res = $dbw->select( 'revision', 'rev_user_text',
2768                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2769                         __METHOD__,
2770                         array( 'LIMIT' => 20 )
2771                 );
2772
2773                 if ( $res === false ) {
2774                         // This page has no revisions, which is very weird
2775                         return false;
2776                 }
2777
2778                 $hasHistory = ( $res->numRows() > 1 );
2779                 $row = $dbw->fetchObject( $res );
2780
2781                 if ( $row ) { // $row is false if the only contributor is hidden
2782                         $onlyAuthor = $row->rev_user_text;
2783                         // Try to find a second contributor
2784                         foreach ( $res as $row ) {
2785                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2786                                         $onlyAuthor = false;
2787                                         break;
2788                                 }
2789                         }
2790                 } else {
2791                         $onlyAuthor = false;
2792                 }
2793
2794                 $dbw->freeResult( $res );
2795
2796                 // Generate the summary with a '$1' placeholder
2797                 if ( $blank ) {
2798                         // The current revision is blank and the one before is also
2799                         // blank. It's just not our lucky day
2800                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2801                 } else {
2802                         if ( $onlyAuthor ) {
2803                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2804                         } else {
2805                                 $reason = wfMsgForContent( 'excontent', '$1' );
2806                         }
2807                 }
2808
2809                 if ( $reason == '-' ) {
2810                         // Allow these UI messages to be blanked out cleanly
2811                         return '';
2812                 }
2813
2814                 // Replace newlines with spaces to prevent uglyness
2815                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2816                 // Calculate the maximum amount of chars to get
2817                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2818                 $maxLength = 255 - ( strlen( $reason ) - 2 ) - 3;
2819                 $contents = $wgContLang->truncate( $contents, $maxLength );
2820                 // Remove possible unfinished links
2821                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2822                 // Now replace the '$1' placeholder
2823                 $reason = str_replace( '$1', $contents, $reason );
2824
2825                 return $reason;
2826         }
2827
2828
2829         /*
2830          * UI entry point for page deletion
2831          */
2832         public function delete() {
2833                 global $wgUser, $wgOut, $wgRequest;
2834
2835                 $confirm = $wgRequest->wasPosted() &&
2836                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2837
2838                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2839                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2840
2841                 $reason = $this->DeleteReasonList;
2842
2843                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2844                         // Entry from drop down menu + additional comment
2845                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2846                 } elseif ( $reason == 'other' ) {
2847                         $reason = $this->DeleteReason;
2848                 }
2849
2850                 # Flag to hide all contents of the archived revisions
2851                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2852
2853                 # This code desperately needs to be totally rewritten
2854
2855                 # Read-only check...
2856                 if ( wfReadOnly() ) {
2857                         $wgOut->readOnlyPage();
2858
2859                         return;
2860                 }
2861
2862                 # Check permissions
2863                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2864
2865                 if ( count( $permission_errors ) > 0 ) {
2866                         $wgOut->showPermissionsErrorPage( $permission_errors );
2867
2868                         return;
2869                 }
2870
2871                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2872
2873                 # Better double-check that it hasn't been deleted yet!
2874                 $dbw = wfGetDB( DB_MASTER );
2875                 $conds = $this->mTitle->pageCond();
2876                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2877                 if ( $latest === false ) {
2878                         $wgOut->showFatalError(
2879                                 Html::rawElement(
2880                                         'div',
2881                                         array( 'class' => 'error mw-error-cannotdelete' ),
2882                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2883                                 )
2884                         );
2885                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2886                         LogEventsList::showLogExtract(
2887                                 $wgOut,
2888                                 'delete',
2889                                 $this->mTitle->getPrefixedText()
2890                         );
2891
2892                         return;
2893                 }
2894
2895                 # Hack for big sites
2896                 $bigHistory = $this->isBigDeletion();
2897                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2898                         global $wgLang, $wgDeleteRevisionsLimit;
2899
2900                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2901                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2902
2903                         return;
2904                 }
2905
2906                 if ( $confirm ) {
2907                         $this->doDelete( $reason, $suppress );
2908
2909                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgUser->isLoggedIn() ) {
2910                                 $this->doWatch();
2911                         } elseif ( $this->mTitle->userIsWatching() ) {
2912                                 $this->doUnwatch();
2913                         }
2914
2915                         return;
2916                 }
2917
2918                 // Generate deletion reason
2919                 $hasHistory = false;
2920                 if ( !$reason ) {
2921                         $reason = $this->generateReason( $hasHistory );
2922                 }
2923
2924                 // If the page has a history, insert a warning
2925                 if ( $hasHistory && !$confirm ) {
2926                         global $wgLang;
2927
2928                         $skin = $wgUser->getSkin();
2929                         $revisions = $this->estimateRevisionCount();
2930                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2931                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2932                                 wfMsgHtml( 'word-separator' ) . $skin->historyLink() .
2933                                 '</strong>'
2934                         );
2935
2936                         if ( $bigHistory ) {
2937                                 global $wgDeleteRevisionsLimit;
2938
2939                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2940                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2941                         }
2942                 }
2943
2944                 return $this->confirmDelete( $reason );
2945         }
2946
2947         /**
2948          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2949          */
2950         public function isBigDeletion() {
2951                 global $wgDeleteRevisionsLimit;
2952
2953                 if ( $wgDeleteRevisionsLimit ) {
2954                         $revCount = $this->estimateRevisionCount();
2955
2956                         return $revCount > $wgDeleteRevisionsLimit;
2957                 }
2958
2959                 return false;
2960         }
2961
2962         /**
2963          * @return int approximate revision count
2964          */
2965         public function estimateRevisionCount() {
2966                 $dbr = wfGetDB( DB_SLAVE );
2967
2968                 // For an exact count...
2969                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2970                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2971                 return $dbr->estimateRowCount( 'revision', '*',
2972                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2973         }
2974
2975         /**
2976          * Get the last N authors
2977          * @param $num Integer: number of revisions to get
2978          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2979          * @return array Array of authors, duplicates not removed
2980          */
2981         public function getLastNAuthors( $num, $revLatest = 0 ) {
2982                 wfProfileIn( __METHOD__ );
2983                 // First try the slave
2984                 // If that doesn't have the latest revision, try the master
2985                 $continue = 2;
2986                 $db = wfGetDB( DB_SLAVE );
2987
2988                 do {
2989                         $res = $db->select( array( 'page', 'revision' ),
2990                                 array( 'rev_id', 'rev_user_text' ),
2991                                 array(
2992                                         'page_namespace' => $this->mTitle->getNamespace(),
2993                                         'page_title' => $this->mTitle->getDBkey(),
2994                                         'rev_page = page_id'
2995                                 ), __METHOD__, $this->getSelectOptions( array(
2996                                         'ORDER BY' => 'rev_timestamp DESC',
2997                                         'LIMIT' => $num
2998                                 ) )
2999                         );
3000
3001                         if ( !$res ) {
3002                                 wfProfileOut( __METHOD__ );
3003                                 return array();
3004                         }
3005
3006                         $row = $db->fetchObject( $res );
3007
3008                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
3009                                 $db = wfGetDB( DB_MASTER );
3010                                 $continue--;
3011                         } else {
3012                                 $continue = 0;
3013                         }
3014                 } while ( $continue );
3015
3016                 $authors = array( $row->rev_user_text );
3017
3018                 while ( $row = $db->fetchObject( $res ) ) {
3019                         $authors[] = $row->rev_user_text;
3020                 }
3021
3022                 wfProfileOut( __METHOD__ );
3023                 return $authors;
3024         }
3025
3026         /**
3027          * Output deletion confirmation dialog
3028          * @param $reason String: prefilled reason
3029          */
3030         public function confirmDelete( $reason ) {
3031                 global $wgOut, $wgUser;
3032
3033                 wfDebug( "Article::confirmDelete\n" );
3034
3035                 $deleteBackLink = $wgUser->getSkin()->link(
3036                         $this->mTitle,
3037                         null,
3038                         array(),
3039                         array(),
3040                         array( 'known', 'noclasses' )
3041                 );
3042                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
3043                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3044                 $wgOut->addWikiMsg( 'confirmdeletetext' );
3045
3046                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
3047
3048                 if ( $wgUser->isAllowed( 'suppressrevision' ) ) {
3049                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
3050                                         <td></td>
3051                                         <td class='mw-input'><strong>" .
3052                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
3053                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
3054                                         "</strong></td>
3055                                 </tr>";
3056                 } else {
3057                         $suppress = '';
3058                 }
3059                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
3060
3061                 $form = Xml::openElement( 'form', array( 'method' => 'post',
3062                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
3063                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
3064                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
3065                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
3066                         "<tr id=\"wpDeleteReasonListRow\">
3067                                 <td class='mw-label'>" .
3068                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
3069                                 "</td>
3070                                 <td class='mw-input'>" .
3071                                         Xml::listDropDown( 'wpDeleteReasonList',
3072                                                 wfMsgForContent( 'deletereason-dropdown' ),
3073                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
3074                                 "</td>
3075                         </tr>
3076                         <tr id=\"wpDeleteReasonRow\">
3077                                 <td class='mw-label'>" .
3078                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
3079                                 "</td>
3080                                 <td class='mw-input'>" .
3081                                 Html::input( 'wpReason', $reason, 'text', array(
3082                                         'size' => '60',
3083                                         'maxlength' => '255',
3084                                         'tabindex' => '2',
3085                                         'id' => 'wpReason',
3086                                         'autofocus'
3087                                 ) ) .
3088                                 "</td>
3089                         </tr>";
3090
3091                 # Disallow watching if user is not logged in
3092                 if ( $wgUser->isLoggedIn() ) {
3093                         $form .= "
3094                         <tr>
3095                                 <td></td>
3096                                 <td class='mw-input'>" .
3097                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3098                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3099                                 "</td>
3100                         </tr>";
3101                 }
3102
3103                 $form .= "
3104                         $suppress
3105                         <tr>
3106                                 <td></td>
3107                                 <td class='mw-submit'>" .
3108                                         Xml::submitButton( wfMsg( 'deletepage' ),
3109                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3110                                 "</td>
3111                         </tr>" .
3112                         Xml::closeElement( 'table' ) .
3113                         Xml::closeElement( 'fieldset' ) .
3114                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
3115                         Xml::closeElement( 'form' );
3116
3117                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
3118                                 $skin = $wgUser->getSkin();
3119                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3120                                 $link = $skin->link(
3121                                         $title,
3122                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3123                                         array(),
3124                                         array( 'action' => 'edit' )
3125                                 );
3126                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3127                         }
3128
3129                 $wgOut->addHTML( $form );
3130                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3131                 LogEventsList::showLogExtract(
3132                         $wgOut,
3133                         'delete',
3134                         $this->mTitle->getPrefixedText()
3135                 );
3136         }
3137
3138         /**
3139          * Perform a deletion and output success or failure messages
3140          */
3141         public function doDelete( $reason, $suppress = false ) {
3142                 global $wgOut, $wgUser;
3143
3144                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3145
3146                 $error = '';
3147                 if ( wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3148                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
3149                                 $deleted = $this->mTitle->getPrefixedText();
3150
3151                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3152                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3153
3154                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3155
3156                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3157                                 $wgOut->returnToMain( false );
3158                                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3159                         }
3160                 } else {
3161                         if ( $error == '' ) {
3162                                 $wgOut->showFatalError(
3163                                         Html::rawElement(
3164                                                 'div',
3165                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3166                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3167                                         )
3168                                 );
3169
3170                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3171
3172                                 LogEventsList::showLogExtract(
3173                                         $wgOut,
3174                                         'delete',
3175                                         $this->mTitle->getPrefixedText()
3176                                 );
3177                         } else {
3178                                 $wgOut->showFatalError( $error );
3179                         }
3180                 }
3181         }
3182
3183         /**
3184          * Back-end article deletion
3185          * Deletes the article with database consistency, writes logs, purges caches
3186          *
3187          * @param $reason string delete reason for deletion log
3188          * @param suppress bitfield
3189          *      Revision::DELETED_TEXT
3190          *      Revision::DELETED_COMMENT
3191          *      Revision::DELETED_USER
3192          *      Revision::DELETED_RESTRICTED
3193          * @param $id int article ID
3194          * @param $commit boolean defaults to true, triggers transaction end
3195          * @return boolean true if successful
3196          */
3197         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true ) {
3198                 global $wgUseSquid, $wgDeferredUpdateList;
3199                 global $wgUseTrackbacks;
3200
3201                 wfDebug( __METHOD__ . "\n" );
3202
3203                 $dbw = wfGetDB( DB_MASTER );
3204                 $ns = $this->mTitle->getNamespace();
3205                 $t = $this->mTitle->getDBkey();
3206                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
3207
3208                 if ( $t == '' || $id == 0 ) {
3209                         return false;
3210                 }
3211
3212                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3213                 array_push( $wgDeferredUpdateList, $u );
3214
3215                 // Bitfields to further suppress the content
3216                 if ( $suppress ) {
3217                         $bitfield = 0;
3218                         // This should be 15...
3219                         $bitfield |= Revision::DELETED_TEXT;
3220                         $bitfield |= Revision::DELETED_COMMENT;
3221                         $bitfield |= Revision::DELETED_USER;
3222                         $bitfield |= Revision::DELETED_RESTRICTED;
3223                 } else {
3224                         $bitfield = 'rev_deleted';
3225                 }
3226
3227                 $dbw->begin();
3228                 // For now, shunt the revision data into the archive table.
3229                 // Text is *not* removed from the text table; bulk storage
3230                 // is left intact to avoid breaking block-compression or
3231                 // immutable storage schemes.
3232                 //
3233                 // For backwards compatibility, note that some older archive
3234                 // table entries will have ar_text and ar_flags fields still.
3235                 //
3236                 // In the future, we may keep revisions and mark them with
3237                 // the rev_deleted field, which is reserved for this purpose.
3238                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3239                         array(
3240                                 'ar_namespace'  => 'page_namespace',
3241                                 'ar_title'      => 'page_title',
3242                                 'ar_comment'    => 'rev_comment',
3243                                 'ar_user'       => 'rev_user',
3244                                 'ar_user_text'  => 'rev_user_text',
3245                                 'ar_timestamp'  => 'rev_timestamp',
3246                                 'ar_minor_edit' => 'rev_minor_edit',
3247                                 'ar_rev_id'     => 'rev_id',
3248                                 'ar_text_id'    => 'rev_text_id',
3249                                 'ar_text'       => '\'\'', // Be explicit to appease
3250                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3251                                 'ar_len'        => 'rev_len',
3252                                 'ar_page_id'    => 'page_id',
3253                                 'ar_deleted'    => $bitfield
3254                         ), array(
3255                                 'page_id' => $id,
3256                                 'page_id = rev_page'
3257                         ), __METHOD__
3258                 );
3259
3260                 # Delete restrictions for it
3261                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3262
3263                 # Now that it's safely backed up, delete it
3264                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3265                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3266
3267                 if ( !$ok ) {
3268                         $dbw->rollback();
3269                         return false;
3270                 }
3271
3272                 # Fix category table counts
3273                 $cats = array();
3274                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3275
3276                 foreach ( $res as $row ) {
3277                         $cats [] = $row->cl_to;
3278                 }
3279
3280                 $this->updateCategoryCounts( array(), $cats );
3281
3282                 # If using cascading deletes, we can skip some explicit deletes
3283                 if ( !$dbw->cascadingDeletes() ) {
3284                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3285
3286                         if ( $wgUseTrackbacks )
3287                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3288
3289                         # Delete outgoing links
3290                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3291                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3292                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3293                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3294                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3295                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3296                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3297                 }
3298
3299                 # If using cleanup triggers, we can skip some manual deletes
3300                 if ( !$dbw->cleanupTriggers() ) {
3301                         # Clean up recentchanges entries...
3302                         $dbw->delete( 'recentchanges',
3303                                 array( 'rc_type != ' . RC_LOG,
3304                                         'rc_namespace' => $this->mTitle->getNamespace(),
3305                                         'rc_title' => $this->mTitle->getDBkey() ),
3306                                 __METHOD__ );
3307                         $dbw->delete( 'recentchanges',
3308                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3309                                 __METHOD__ );
3310                 }
3311
3312                 # Clear caches
3313                 Article::onArticleDelete( $this->mTitle );
3314
3315                 # Clear the cached article id so the interface doesn't act like we exist
3316                 $this->mTitle->resetArticleID( 0 );
3317
3318                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3319                 $logtype = $suppress ? 'suppress' : 'delete';
3320                 $log = new LogPage( $logtype );
3321
3322                 # Make sure logging got through
3323                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3324
3325                 if ( $commit ) {
3326                         $dbw->commit();
3327                 }
3328
3329                 return true;
3330         }
3331
3332         /**
3333          * Roll back the most recent consecutive set of edits to a page
3334          * from the same user; fails if there are no eligible edits to
3335          * roll back to, e.g. user is the sole contributor. This function
3336          * performs permissions checks on $wgUser, then calls commitRollback()
3337          * to do the dirty work
3338          *
3339          * @param $fromP String: Name of the user whose edits to rollback.
3340          * @param $summary String: Custom summary. Set to default summary if empty.
3341          * @param $token String: Rollback token.
3342          * @param $bot Boolean: If true, mark all reverted edits as bot.
3343          *
3344          * @param $resultDetails Array: contains result-specific array of additional values
3345          *    'alreadyrolled' : 'current' (rev)
3346          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3347          *
3348          * @return array of errors, each error formatted as
3349          *   array(messagekey, param1, param2, ...).
3350          * On success, the array is empty.  This array can also be passed to
3351          * OutputPage::showPermissionsErrorPage().
3352          */
3353         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3354                 global $wgUser;
3355
3356                 $resultDetails = null;
3357
3358                 # Check permissions
3359                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3360                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3361                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3362
3363                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3364                         $errors[] = array( 'sessionfailure' );
3365                 }
3366
3367                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3368                         $errors[] = array( 'actionthrottledtext' );
3369                 }
3370
3371                 # If there were errors, bail out now
3372                 if ( !empty( $errors ) ) {
3373                         return $errors;
3374                 }
3375
3376                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3377         }
3378
3379         /**
3380          * Backend implementation of doRollback(), please refer there for parameter
3381          * and return value documentation
3382          *
3383          * NOTE: This function does NOT check ANY permissions, it just commits the
3384          * rollback to the DB Therefore, you should only call this function direct-
3385          * ly if you want to use custom permissions checks. If you don't, use
3386          * doRollback() instead.
3387          */
3388         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3389                 global $wgUseRCPatrol, $wgUser, $wgLang;
3390
3391                 $dbw = wfGetDB( DB_MASTER );
3392
3393                 if ( wfReadOnly() ) {
3394                         return array( array( 'readonlytext' ) );
3395                 }
3396
3397                 # Get the last editor
3398                 $current = Revision::newFromTitle( $this->mTitle );
3399                 if ( is_null( $current ) ) {
3400                         # Something wrong... no page?
3401                         return array( array( 'notanarticle' ) );
3402                 }
3403
3404                 $from = str_replace( '_', ' ', $fromP );
3405                 # User name given should match up with the top revision.
3406                 # If the user was deleted then $from should be empty.
3407                 if ( $from != $current->getUserText() ) {
3408                         $resultDetails = array( 'current' => $current );
3409                         return array( array( 'alreadyrolled',
3410                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3411                                 htmlspecialchars( $fromP ),
3412                                 htmlspecialchars( $current->getUserText() )
3413                         ) );
3414                 }
3415
3416                 # Get the last edit not by this guy...
3417                 # Note: these may not be public values
3418                 $user = intval( $current->getRawUser() );
3419                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3420                 $s = $dbw->selectRow( 'revision',
3421                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3422                         array( 'rev_page' => $current->getPage(),
3423                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3424                         ), __METHOD__,
3425                         array( 'USE INDEX' => 'page_timestamp',
3426                                 'ORDER BY' => 'rev_timestamp DESC' )
3427                         );
3428                 if ( $s === false ) {
3429                         # No one else ever edited this page
3430                         return array( array( 'cantrollback' ) );
3431                 } else if ( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
3432                         # Only admins can see this text
3433                         return array( array( 'notvisiblerev' ) );
3434                 }
3435
3436                 $set = array();
3437                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3438                         # Mark all reverted edits as bot
3439                         $set['rc_bot'] = 1;
3440                 }
3441
3442                 if ( $wgUseRCPatrol ) {
3443                         # Mark all reverted edits as patrolled
3444                         $set['rc_patrolled'] = 1;
3445                 }
3446
3447                 if ( count( $set ) ) {
3448                         $dbw->update( 'recentchanges', $set,
3449                                 array( /* WHERE */
3450                                         'rc_cur_id' => $current->getPage(),
3451                                         'rc_user_text' => $current->getUserText(),
3452                                         "rc_timestamp > '{$s->rev_timestamp}'",
3453                                 ), __METHOD__
3454                         );
3455                 }
3456
3457                 # Generate the edit summary if necessary
3458                 $target = Revision::newFromId( $s->rev_id );
3459                 if ( empty( $summary ) ) {
3460                         if ( $from == '' ) { // no public user name
3461                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3462                         } else {
3463                                 $summary = wfMsgForContent( 'revertpage' );
3464                         }
3465                 }
3466
3467                 # Allow the custom summary to use the same args as the default message
3468                 $args = array(
3469                         $target->getUserText(), $from, $s->rev_id,
3470                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3471                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3472                 );
3473                 $summary = wfMsgReplaceArgs( $summary, $args );
3474
3475                 # Save
3476                 $flags = EDIT_UPDATE;
3477
3478                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3479                         $flags |= EDIT_MINOR;
3480                 }
3481
3482                 if ( $bot && ( $wgUser->isAllowed( 'markbotedits' ) || $wgUser->isAllowed( 'bot' ) ) ) {
3483                         $flags |= EDIT_FORCE_BOT;
3484                 }
3485
3486                 # Actually store the edit
3487                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3488                 if ( !empty( $status->value['revision'] ) ) {
3489                         $revId = $status->value['revision']->getId();
3490                 } else {
3491                         $revId = false;
3492                 }
3493
3494                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3495
3496                 $resultDetails = array(
3497                         'summary' => $summary,
3498                         'current' => $current,
3499                         'target'  => $target,
3500                         'newid'   => $revId
3501                 );
3502
3503                 return array();
3504         }
3505
3506         /**
3507          * User interface for rollback operations
3508          */
3509         public function rollback() {
3510                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
3511
3512                 $details = null;
3513
3514                 $result = $this->doRollback(
3515                         $wgRequest->getVal( 'from' ),
3516                         $wgRequest->getText( 'summary' ),
3517                         $wgRequest->getVal( 'token' ),
3518                         $wgRequest->getBool( 'bot' ),
3519                         $details
3520                 );
3521
3522                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3523                         $wgOut->rateLimited();
3524                         return;
3525                 }
3526
3527                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3528                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3529                         $errArray = $result[0];
3530                         $errMsg = array_shift( $errArray );
3531                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3532
3533                         if ( isset( $details['current'] ) ) {
3534                                 $current = $details['current'];
3535
3536                                 if ( $current->getComment() != '' ) {
3537                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3538                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3539                                 }
3540                         }
3541
3542                         return;
3543                 }
3544
3545                 # Display permissions errors before read-only message -- there's no
3546                 # point in misleading the user into thinking the inability to rollback
3547                 # is only temporary.
3548                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3549                         # array_diff is completely broken for arrays of arrays, sigh.
3550                         # Remove any 'readonlytext' error manually.
3551                         $out = array();
3552                         foreach ( $result as $error ) {
3553                                 if ( $error != array( 'readonlytext' ) ) {
3554                                         $out [] = $error;
3555                                 }
3556                         }
3557                         $wgOut->showPermissionsErrorPage( $out );
3558
3559                         return;
3560                 }
3561
3562                 if ( $result == array( array( 'readonlytext' ) ) ) {
3563                         $wgOut->readOnlyPage();
3564
3565                         return;
3566                 }
3567
3568                 $current = $details['current'];
3569                 $target = $details['target'];
3570                 $newId = $details['newid'];
3571                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3572                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3573
3574                 if ( $current->getUserText() === '' ) {
3575                         $old = wfMsg( 'rev-deleted-user' );
3576                 } else {
3577                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3578                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3579                 }
3580
3581                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3582                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3583                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3584                 $wgOut->returnToMain( false, $this->mTitle );
3585
3586                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3587                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3588                         $de->showDiff( '', '' );
3589                 }
3590         }
3591
3592         /**
3593          * Do standard deferred updates after page view
3594          */
3595         public function viewUpdates() {
3596                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3597                 if ( wfReadOnly() ) {
3598                         return;
3599                 }
3600
3601                 # Don't update page view counters on views from bot users (bug 14044)
3602                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3603                         Article::incViewCount( $this->getID() );
3604                         $u = new SiteStatsUpdate( 1, 0, 0 );
3605                         array_push( $wgDeferredUpdateList, $u );
3606                 }
3607
3608                 # Update newtalk / watchlist notification status
3609                 $wgUser->clearNotification( $this->mTitle );
3610         }
3611
3612         /**
3613          * Prepare text which is about to be saved.
3614          * Returns a stdclass with source, pst and output members
3615          */
3616         public function prepareTextForEdit( $text, $revid = null ) {
3617                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3618                         // Already prepared
3619                         return $this->mPreparedEdit;
3620                 }
3621
3622                 global $wgParser;
3623
3624                 $edit = (object)array();
3625                 $edit->revid = $revid;
3626                 $edit->newText = $text;
3627                 $edit->pst = $this->preSaveTransform( $text );
3628                 $options = $this->getParserOptions();
3629                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
3630                 $edit->oldText = $this->getContent();
3631
3632                 $this->mPreparedEdit = $edit;
3633
3634                 return $edit;
3635         }
3636
3637         /**
3638          * Do standard deferred updates after page edit.
3639          * Update links tables, site stats, search index and message cache.
3640          * Purges pages that include this page if the text was changed here.
3641          * Every 100th edit, prune the recent changes table.
3642          *
3643          * @private
3644          * @param $text New text of the article
3645          * @param $summary Edit summary
3646          * @param $minoredit Minor edit
3647          * @param $timestamp_of_pagechange Timestamp associated with the page change
3648          * @param $newid rev_id value of the new revision
3649          * @param $changed Whether or not the content actually changed
3650          */
3651         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
3652                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgEnableParserCache;
3653
3654                 wfProfileIn( __METHOD__ );
3655
3656                 # Parse the text
3657                 # Be careful not to double-PST: $text is usually already PST-ed once
3658                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3659                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3660                         $editInfo = $this->prepareTextForEdit( $text, $newid );
3661                 } else {
3662                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3663                         $editInfo = $this->mPreparedEdit;
3664                 }
3665
3666                 # Save it to the parser cache
3667                 if ( $wgEnableParserCache ) {
3668                         $popts = $this->getParserOptions();
3669                         $parserCache = ParserCache::singleton();
3670                         $parserCache->save( $editInfo->output, $this, $popts );
3671                 }
3672
3673                 # Update the links tables
3674                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3675                 $u->doUpdate();
3676
3677                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3678
3679                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3680                         if ( 0 == mt_rand( 0, 99 ) ) {
3681                                 // Flush old entries from the `recentchanges` table; we do this on
3682                                 // random requests so as to avoid an increase in writes for no good reason
3683                                 global $wgRCMaxAge;
3684
3685                                 $dbw = wfGetDB( DB_MASTER );
3686                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3687                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3688                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3689
3690                                 $dbw->query( $sql );
3691                         }
3692                 }
3693
3694                 $id = $this->getID();
3695                 $title = $this->mTitle->getPrefixedDBkey();
3696                 $shortTitle = $this->mTitle->getDBkey();
3697
3698                 if ( 0 == $id ) {
3699                         wfProfileOut( __METHOD__ );
3700                         return;
3701                 }
3702
3703                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3704                 array_push( $wgDeferredUpdateList, $u );
3705                 $u = new SearchUpdate( $id, $title, $text );
3706                 array_push( $wgDeferredUpdateList, $u );
3707
3708                 # If this is another user's talk page, update newtalk
3709                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3710                 # load of user talk pages and piss people off, nor if it's a minor edit
3711                 # by a properly-flagged bot.
3712                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3713                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3714                 ) {
3715                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3716                                 $other = User::newFromName( $shortTitle, false );
3717                                 if ( !$other ) {
3718                                         wfDebug( __METHOD__ . ": invalid username\n" );
3719                                 } elseif ( User::isIP( $shortTitle ) ) {
3720                                         // An anonymous user
3721                                         $other->setNewtalk( true );
3722                                 } elseif ( $other->isLoggedIn() ) {
3723                                         $other->setNewtalk( true );
3724                                 } else {
3725                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3726                                 }
3727                         }
3728                 }
3729
3730                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3731                         $wgMessageCache->replace( $shortTitle, $text );
3732                 }
3733
3734                 wfProfileOut( __METHOD__ );
3735         }
3736
3737         /**
3738          * Perform article updates on a special page creation.
3739          *
3740          * @param $rev Revision object
3741          *
3742          * @todo This is a shitty interface function. Kill it and replace the
3743          * other shitty functions like editUpdates and such so it's not needed
3744          * anymore.
3745          */
3746         public function createUpdates( $rev ) {
3747                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3748                 $this->mTotalAdjustment = 1;
3749                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3750                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3751         }
3752
3753         /**
3754          * Generate the navigation links when browsing through an article revisions
3755          * It shows the information as:
3756          *   Revision as of \<date\>; view current revision
3757          *   \<- Previous version | Next Version -\>
3758          *
3759          * @param $oldid String: revision ID of this article revision
3760          */
3761         public function setOldSubtitle( $oldid = 0 ) {
3762                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3763
3764                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3765                         return;
3766                 }
3767
3768                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3769
3770                 # Cascade unhide param in links for easy deletion browsing
3771                 $extraParams = array();
3772                 if ( $wgRequest->getVal( 'unhide' ) ) {
3773                         $extraParams['unhide'] = 1;
3774                 }
3775
3776                 $revision = Revision::newFromId( $oldid );
3777
3778                 $current = ( $oldid == $this->mLatest );
3779                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3780                 $tddate = $wgLang->date( $this->mTimestamp, true );
3781                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3782                 $sk = $wgUser->getSkin();
3783                 $lnk = $current
3784                         ? wfMsgHtml( 'currentrevisionlink' )
3785                         : $sk->link(
3786                                 $this->mTitle,
3787                                 wfMsgHtml( 'currentrevisionlink' ),
3788                                 array(),
3789                                 $extraParams,
3790                                 array( 'known', 'noclasses' )
3791                         );
3792                 $curdiff = $current
3793                         ? wfMsgHtml( 'diff' )
3794                         : $sk->link(
3795                                 $this->mTitle,
3796                                 wfMsgHtml( 'diff' ),
3797                                 array(),
3798                                 array(
3799                                         'diff' => 'cur',
3800                                         'oldid' => $oldid
3801                                 ) + $extraParams,
3802                                 array( 'known', 'noclasses' )
3803                         );
3804                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3805                 $prevlink = $prev
3806                         ? $sk->link(
3807                                 $this->mTitle,
3808                                 wfMsgHtml( 'previousrevision' ),
3809                                 array(),
3810                                 array(
3811                                         'direction' => 'prev',
3812                                         'oldid' => $oldid
3813                                 ) + $extraParams,
3814                                 array( 'known', 'noclasses' )
3815                         )
3816                         : wfMsgHtml( 'previousrevision' );
3817                 $prevdiff = $prev
3818                         ? $sk->link(
3819                                 $this->mTitle,
3820                                 wfMsgHtml( 'diff' ),
3821                                 array(),
3822                                 array(
3823                                         'diff' => 'prev',
3824                                         'oldid' => $oldid
3825                                 ) + $extraParams,
3826                                 array( 'known', 'noclasses' )
3827                         )
3828                         : wfMsgHtml( 'diff' );
3829                 $nextlink = $current
3830                         ? wfMsgHtml( 'nextrevision' )
3831                         : $sk->link(
3832                                 $this->mTitle,
3833                                 wfMsgHtml( 'nextrevision' ),
3834                                 array(),
3835                                 array(
3836                                         'direction' => 'next',
3837                                         'oldid' => $oldid
3838                                 ) + $extraParams,
3839                                 array( 'known', 'noclasses' )
3840                         );
3841                 $nextdiff = $current
3842                         ? wfMsgHtml( 'diff' )
3843                         : $sk->link(
3844                                 $this->mTitle,
3845                                 wfMsgHtml( 'diff' ),
3846                                 array(),
3847                                 array(
3848                                         'diff' => 'next',
3849                                         'oldid' => $oldid
3850                                 ) + $extraParams,
3851                                 array( 'known', 'noclasses' )
3852                         );
3853
3854                 $cdel = '';
3855
3856                 // User can delete revisions or view deleted revisions...
3857                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3858                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3859                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3860                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3861                         } else {
3862                                 $query = array(
3863                                         'type'   => 'revision',
3864                                         'target' => $this->mTitle->getPrefixedDbkey(),
3865                                         'ids'    => $oldid
3866                                 );
3867                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3868                         }
3869                         $cdel .= ' ';
3870                 }
3871
3872                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3873                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3874
3875                 $m = wfMsg( 'revision-info-current' );
3876                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3877                         ? 'revision-info-current'
3878                         : 'revision-info';
3879
3880                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3881                         wfMsgExt(
3882                                 $infomsg,
3883                                 array( 'parseinline', 'replaceafter' ),
3884                                 $td,
3885                                 $userlinks,
3886                                 $revision->getID(),
3887                                 $tddate,
3888                                 $tdtime,
3889                                 $revision->getUser()
3890                         ) .
3891                         "</div>\n" .
3892                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3893                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3894
3895                 $wgOut->setSubtitle( $r );
3896         }
3897
3898         /**
3899          * This function is called right before saving the wikitext,
3900          * so we can do things like signatures and links-in-context.
3901          *
3902          * @param $text String article contents
3903          * @return string article contents with altered wikitext markup (signatures
3904          *      converted, {{subst:}}, templates, etc.)
3905          */
3906         public function preSaveTransform( $text ) {
3907                 global $wgParser, $wgUser;
3908
3909                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3910         }
3911
3912         /* Caching functions */
3913
3914         /**
3915          * checkLastModified returns true if it has taken care of all
3916          * output to the client that is necessary for this request.
3917          * (that is, it has sent a cached version of the page)
3918          *
3919          * @return boolean true if cached version send, false otherwise
3920          */
3921         protected function tryFileCache() {
3922                 static $called = false;
3923
3924                 if ( $called ) {
3925                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3926                         return false;
3927                 }
3928
3929                 $called = true;
3930                 if ( $this->isFileCacheable() ) {
3931                         $cache = new HTMLFileCache( $this->mTitle );
3932                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3933                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3934                                 $cache->loadFromFileCache();
3935                                 return true;
3936                         } else {
3937                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3938                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3939                         }
3940                 } else {
3941                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3942                 }
3943
3944                 return false;
3945         }
3946
3947         /**
3948          * Check if the page can be cached
3949          * @return bool
3950          */
3951         public function isFileCacheable() {
3952                 $cacheable = false;
3953
3954                 if ( HTMLFileCache::useFileCache() ) {
3955                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3956                         // Extension may have reason to disable file caching on some pages.
3957                         if ( $cacheable ) {
3958                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3959                         }
3960                 }
3961
3962                 return $cacheable;
3963         }
3964
3965         /**
3966          * Loads page_touched and returns a value indicating if it should be used
3967          * @return boolean true if not a redirect
3968          */
3969         public function checkTouched() {
3970                 if ( !$this->mDataLoaded ) {
3971                         $this->loadPageData();
3972                 }
3973
3974                 return !$this->mIsRedirect;
3975         }
3976
3977         /**
3978          * Get the page_touched field
3979          * @return string containing GMT timestamp
3980          */
3981         public function getTouched() {
3982                 # Ensure that page data has been loaded
3983                 if ( !$this->mDataLoaded ) {
3984                         $this->loadPageData();
3985                 }
3986
3987                 return $this->mTouched;
3988         }
3989
3990         /**
3991          * Get the page_latest field
3992          * @return integer rev_id of current revision
3993          */
3994         public function getLatest() {
3995                 if ( !$this->mDataLoaded ) {
3996                         $this->loadPageData();
3997                 }
3998
3999                 return (int)$this->mLatest;
4000         }
4001
4002         /**
4003          * Edit an article without doing all that other stuff
4004          * The article must already exist; link tables etc
4005          * are not updated, caches are not flushed.
4006          *
4007          * @param $text String: text submitted
4008          * @param $comment String: comment submitted
4009          * @param $minor Boolean: whereas it's a minor modification
4010          */
4011         public function quickEdit( $text, $comment = '', $minor = 0 ) {
4012                 wfProfileIn( __METHOD__ );
4013
4014                 $dbw = wfGetDB( DB_MASTER );
4015                 $revision = new Revision( array(
4016                         'page'       => $this->getId(),
4017                         'text'       => $text,
4018                         'comment'    => $comment,
4019                         'minor_edit' => $minor ? 1 : 0,
4020                         ) );
4021                 $revision->insertOn( $dbw );
4022                 $this->updateRevisionOn( $dbw, $revision );
4023
4024                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
4025
4026                 wfProfileOut( __METHOD__ );
4027         }
4028
4029         /**
4030          * Used to increment the view counter
4031          *
4032          * @param $id Integer: article id
4033          */
4034         public static function incViewCount( $id ) {
4035                 $id = intval( $id );
4036
4037                 global $wgHitcounterUpdateFreq;
4038
4039                 $dbw = wfGetDB( DB_MASTER );
4040                 $pageTable = $dbw->tableName( 'page' );
4041                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
4042                 $acchitsTable = $dbw->tableName( 'acchits' );
4043
4044                 if ( $wgHitcounterUpdateFreq <= 1 ) {
4045                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
4046
4047                         return;
4048                 }
4049
4050                 # Not important enough to warrant an error page in case of failure
4051                 $oldignore = $dbw->ignoreErrors( true );
4052
4053                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
4054
4055                 $checkfreq = intval( $wgHitcounterUpdateFreq / 25 + 1 );
4056                 if ( ( rand() % $checkfreq != 0 ) or ( $dbw->lastErrno() != 0 ) ) {
4057                         # Most of the time (or on SQL errors), skip row count check
4058                         $dbw->ignoreErrors( $oldignore );
4059
4060                         return;
4061                 }
4062
4063                 $res = $dbw->query( "SELECT COUNT(*) as n FROM $hitcounterTable" );
4064                 $row = $dbw->fetchObject( $res );
4065                 $rown = intval( $row->n );
4066
4067                 if ( $rown >= $wgHitcounterUpdateFreq ) {
4068                         wfProfileIn( 'Article::incViewCount-collect' );
4069                         $old_user_abort = ignore_user_abort( true );
4070
4071                         $dbType = $dbw->getType();
4072                         $dbw->lockTables( array(), array( 'hitcounter' ), __METHOD__, false );
4073                         $tabletype = $dbType == 'mysql' ? "ENGINE=HEAP " : '';
4074                         $dbw->query( "CREATE TEMPORARY TABLE $acchitsTable $tabletype AS " .
4075                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable " .
4076                                 'GROUP BY hc_id', __METHOD__ );
4077                         $dbw->delete( 'hitcounter', '*', __METHOD__ );
4078                         $dbw->unlockTables( __METHOD__ );
4079
4080                         if ( $dbType == 'mysql' ) {
4081                                 $dbw->query( "UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n " .
4082                                         'WHERE page_id = hc_id', __METHOD__ );
4083                         } else {
4084                                 $dbw->query( "UPDATE $pageTable SET page_counter=page_counter + hc_n " .
4085                                         "FROM $acchitsTable WHERE page_id = hc_id", __METHOD__ );
4086                         }
4087                         $dbw->query( "DROP TABLE $acchitsTable", __METHOD__ );
4088
4089                         ignore_user_abort( $old_user_abort );
4090                         wfProfileOut( 'Article::incViewCount-collect' );
4091                 }
4092
4093                 $dbw->ignoreErrors( $oldignore );
4094         }
4095
4096         /**#@+
4097          * The onArticle*() functions are supposed to be a kind of hooks
4098          * which should be called whenever any of the specified actions
4099          * are done.
4100          *
4101          * This is a good place to put code to clear caches, for instance.
4102          *
4103          * This is called on page move and undelete, as well as edit
4104          *
4105          * @param $title a title object
4106          */
4107         public static function onArticleCreate( $title ) {
4108                 # Update existence markers on article/talk tabs...
4109                 if ( $title->isTalkPage() ) {
4110                         $other = $title->getSubjectPage();
4111                 } else {
4112                         $other = $title->getTalkPage();
4113                 }
4114
4115                 $other->invalidateCache();
4116                 $other->purgeSquid();
4117
4118                 $title->touchLinks();
4119                 $title->purgeSquid();
4120                 $title->deleteTitleProtection();
4121         }
4122
4123         /**
4124          * Clears caches when article is deleted
4125          */
4126         public static function onArticleDelete( $title ) {
4127                 global $wgMessageCache;
4128
4129                 # Update existence markers on article/talk tabs...
4130                 if ( $title->isTalkPage() ) {
4131                         $other = $title->getSubjectPage();
4132                 } else {
4133                         $other = $title->getTalkPage();
4134                 }
4135
4136                 $other->invalidateCache();
4137                 $other->purgeSquid();
4138
4139                 $title->touchLinks();
4140                 $title->purgeSquid();
4141
4142                 # File cache
4143                 HTMLFileCache::clearFileCache( $title );
4144
4145                 # Messages
4146                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4147                         $wgMessageCache->replace( $title->getDBkey(), false );
4148                 }
4149
4150                 # Images
4151                 if ( $title->getNamespace() == NS_FILE ) {
4152                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4153                         $update->doUpdate();
4154                 }
4155
4156                 # User talk pages
4157                 if ( $title->getNamespace() == NS_USER_TALK ) {
4158                         $user = User::newFromName( $title->getText(), false );
4159                         $user->setNewtalk( false );
4160                 }
4161
4162                 # Image redirects
4163                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4164         }
4165
4166         /**
4167          * Purge caches on page update etc
4168          *
4169          * @param $title Title object
4170          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4171          */
4172         public static function onArticleEdit( $title ) {
4173                 global $wgDeferredUpdateList;
4174
4175                 // Invalidate caches of articles which include this page
4176                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4177
4178                 // Invalidate the caches of all pages which redirect here
4179                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4180
4181                 # Purge squid for this page only
4182                 $title->purgeSquid();
4183
4184                 # Clear file cache for this page only
4185                 HTMLFileCache::clearFileCache( $title );
4186         }
4187
4188         /**#@-*/
4189
4190         /**
4191          * Overriden by ImagePage class, only present here to avoid a fatal error
4192          * Called for ?action=revert
4193          */
4194         public function revert() {
4195                 global $wgOut;
4196
4197                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4198         }
4199
4200         /**
4201          * Info about this page
4202          * Called for ?action=info when $wgAllowPageInfo is on.
4203          */
4204         public function info() {
4205                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4206
4207                 if ( !$wgAllowPageInfo ) {
4208                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4209                         return;
4210                 }
4211
4212                 $page = $this->mTitle->getSubjectPage();
4213
4214                 $wgOut->setPagetitle( $page->getPrefixedText() );
4215                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4216                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4217
4218                 if ( !$this->mTitle->exists() ) {
4219                         $wgOut->addHTML( '<div class="noarticletext">' );
4220                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4221                                 // This doesn't quite make sense; the user is asking for
4222                                 // information about the _page_, not the message... -- RC
4223                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
4224                         } else {
4225                                 $msg = $wgUser->isLoggedIn()
4226                                         ? 'noarticletext'
4227                                         : 'noarticletextanon';
4228                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4229                         }
4230
4231                         $wgOut->addHTML( '</div>' );
4232                 } else {
4233                         $dbr = wfGetDB( DB_SLAVE );
4234                         $wl_clause = array(
4235                                 'wl_title'     => $page->getDBkey(),
4236                                 'wl_namespace' => $page->getNamespace() );
4237                         $numwatchers = $dbr->selectField(
4238                                 'watchlist',
4239                                 'COUNT(*)',
4240                                 $wl_clause,
4241                                 __METHOD__,
4242                                 $this->getSelectOptions() );
4243
4244                         $pageInfo = $this->pageCountInfo( $page );
4245                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4246
4247                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4248                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4249
4250                         if ( $talkInfo ) {
4251                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4252                         }
4253
4254                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4255
4256                         if ( $talkInfo ) {
4257                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4258                         }
4259
4260                         $wgOut->addHTML( '</ul>' );
4261                 }
4262         }
4263
4264         /**
4265          * Return the total number of edits and number of unique editors
4266          * on a given page. If page does not exist, returns false.
4267          *
4268          * @param $title Title object
4269          * @return mixed array or boolean false
4270          */
4271         public function pageCountInfo( $title ) {
4272                 $id = $title->getArticleId();
4273
4274                 if ( $id == 0 ) {
4275                         return false;
4276                 }
4277
4278                 $dbr = wfGetDB( DB_SLAVE );
4279                 $rev_clause = array( 'rev_page' => $id );
4280                 $edits = $dbr->selectField(
4281                         'revision',
4282                         'COUNT(rev_page)',
4283                         $rev_clause,
4284                         __METHOD__,
4285                         $this->getSelectOptions()
4286                 );
4287                 $authors = $dbr->selectField(
4288                         'revision',
4289                         'COUNT(DISTINCT rev_user_text)',
4290                         $rev_clause,
4291                         __METHOD__,
4292                         $this->getSelectOptions()
4293                 );
4294
4295                 return array( 'edits' => $edits, 'authors' => $authors );
4296         }
4297
4298         /**
4299          * Return a list of templates used by this article.
4300          * Uses the templatelinks table
4301          *
4302          * @return Array of Title objects
4303          */
4304         public function getUsedTemplates() {
4305                 $result = array();
4306                 $id = $this->mTitle->getArticleID();
4307
4308                 if ( $id == 0 ) {
4309                         return array();
4310                 }
4311
4312                 $dbr = wfGetDB( DB_SLAVE );
4313                 $res = $dbr->select( array( 'templatelinks' ),
4314                         array( 'tl_namespace', 'tl_title' ),
4315                         array( 'tl_from' => $id ),
4316                         __METHOD__ );
4317
4318                 if ( $res !== false ) {
4319                         foreach ( $res as $row ) {
4320                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4321                         }
4322                 }
4323
4324                 $dbr->freeResult( $res );
4325
4326                 return $result;
4327         }
4328
4329         /**
4330          * Returns a list of hidden categories this page is a member of.
4331          * Uses the page_props and categorylinks tables.
4332          *
4333          * @return Array of Title objects
4334          */
4335         public function getHiddenCategories() {
4336                 $result = array();
4337                 $id = $this->mTitle->getArticleID();
4338
4339                 if ( $id == 0 ) {
4340                         return array();
4341                 }
4342
4343                 $dbr = wfGetDB( DB_SLAVE );
4344                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4345                         array( 'cl_to' ),
4346                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4347                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4348                         __METHOD__ );
4349
4350                 if ( $res !== false ) {
4351                         foreach ( $res as $row ) {
4352                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4353                         }
4354                 }
4355
4356                 $dbr->freeResult( $res );
4357
4358                 return $result;
4359         }
4360
4361         /**
4362         * Return an applicable autosummary if one exists for the given edit.
4363         * @param $oldtext String: the previous text of the page.
4364         * @param $newtext String: The submitted text of the page.
4365         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
4366         * @return string An appropriate autosummary, or an empty string.
4367         */
4368         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4369                 # Decide what kind of autosummary is needed.
4370
4371                 # Redirect autosummaries
4372                 $ot = Title::newFromRedirect( $oldtext );
4373                 $rt = Title::newFromRedirect( $newtext );
4374
4375                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4376                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4377                 }
4378
4379                 # New page autosummaries
4380                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4381                         # If they're making a new article, give its text, truncated, in the summary.
4382                         global $wgContLang;
4383
4384                         $truncatedtext = $wgContLang->truncate(
4385                                 str_replace( "\n", ' ', $newtext ),
4386                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4387
4388                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4389                 }
4390
4391                 # Blanking autosummaries
4392                 if ( $oldtext != '' && $newtext == '' ) {
4393                         return wfMsgForContent( 'autosumm-blank' );
4394                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4395                         # Removing more than 90% of the article
4396                         global $wgContLang;
4397
4398                         $truncatedtext = $wgContLang->truncate(
4399                                 $newtext,
4400                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4401
4402                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4403                 }
4404
4405                 # If we reach this point, there's no applicable autosummary for our case, so our
4406                 # autosummary is empty.
4407                 return '';
4408         }
4409
4410         /**
4411          * Add the primary page-view wikitext to the output buffer
4412          * Saves the text into the parser cache if possible.
4413          * Updates templatelinks if it is out of date.
4414          *
4415          * @param $text String
4416          * @param $cache Boolean
4417          * @param $parserOptions mixed ParserOptions object, or boolean false
4418          */
4419         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4420                 global $wgOut;
4421
4422                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4423                 $wgOut->addParserOutput( $this->mParserOutput );
4424         }
4425
4426         /**
4427          * This does all the heavy lifting for outputWikitext, except it returns the parser
4428          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4429          * say, embedding thread pages within a discussion system (LiquidThreads)
4430          *
4431          * @param $text string
4432          * @param $cache boolean
4433          * @param $parserOptions parsing options, defaults to false
4434          * @return string containing parsed output
4435          */
4436         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4437                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
4438
4439                 if ( !$parserOptions ) {
4440                         $parserOptions = $this->getParserOptions();
4441                 }
4442
4443                 $time = - wfTime();
4444                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4445                         $parserOptions, true, true, $this->getRevIdFetched() );
4446                 $time += wfTime();
4447
4448                 # Timing hack
4449                 if ( $time > 3 ) {
4450                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4451                                 $this->mTitle->getPrefixedDBkey() ) );
4452                 }
4453
4454                 if ( $wgEnableParserCache && $cache && $this && $this->mParserOutput->getCacheTime() != -1 ) {
4455                         $parserCache = ParserCache::singleton();
4456                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4457                 }
4458
4459                 // Make sure file cache is not used on uncacheable content.
4460                 // Output that has magic words in it can still use the parser cache
4461                 // (if enabled), though it will generally expire sooner.
4462                 if ( $this->mParserOutput->getCacheTime() == -1 || $this->mParserOutput->containsOldMagic() ) {
4463                         $wgUseFileCache = false;
4464                 }
4465
4466                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4467
4468                 return $this->mParserOutput;
4469         }
4470
4471         /**
4472          * Get parser options suitable for rendering the primary article wikitext
4473          * @return mixed ParserOptions object or boolean false
4474          */
4475         public function getParserOptions() {
4476                 global $wgUser;
4477
4478                 if ( !$this->mParserOptions ) {
4479                         $this->mParserOptions = new ParserOptions( $wgUser );
4480                         $this->mParserOptions->setTidy( true );
4481                         $this->mParserOptions->enableLimitReport();
4482                 }
4483
4484                 return $this->mParserOptions;
4485         }
4486
4487         /**
4488          * Updates cascading protections
4489          *
4490          * @param $parserOutput mixed ParserOptions object, or boolean false
4491          **/
4492
4493         protected function doCascadeProtectionUpdates( $parserOutput ) {
4494                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4495                         return;
4496                 }
4497
4498                 // templatelinks table may have become out of sync,
4499                 // especially if using variable-based transclusions.
4500                 // For paranoia, check if things have changed and if
4501                 // so apply updates to the database. This will ensure
4502                 // that cascaded protections apply as soon as the changes
4503                 // are visible.
4504
4505                 # Get templates from templatelinks
4506                 $id = $this->mTitle->getArticleID();
4507
4508                 $tlTemplates = array();
4509
4510                 $dbr = wfGetDB( DB_SLAVE );
4511                 $res = $dbr->select( array( 'templatelinks' ),
4512                         array( 'tl_namespace', 'tl_title' ),
4513                         array( 'tl_from' => $id ),
4514                         __METHOD__
4515                 );
4516
4517                 global $wgContLang;
4518
4519                 foreach ( $res as $row ) {
4520                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4521                 }
4522
4523                 # Get templates from parser output.
4524                 $poTemplates = array();
4525                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4526                         foreach ( $templates as $dbk => $id ) {
4527                                 $poTemplates["$ns:$dbk"] = true;
4528                         }
4529                 }
4530
4531                 # Get the diff
4532                 # Note that we simulate array_diff_key in PHP <5.0.x
4533                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4534
4535                 if ( count( $templates_diff ) > 0 ) {
4536                         # Whee, link updates time.
4537                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4538                         $u->doUpdate();
4539                 }
4540         }
4541
4542         /**
4543          * Update all the appropriate counts in the category table, given that
4544          * we've added the categories $added and deleted the categories $deleted.
4545          *
4546          * @param $added array   The names of categories that were added
4547          * @param $deleted array The names of categories that were deleted
4548          */
4549         public function updateCategoryCounts( $added, $deleted ) {
4550                 $ns = $this->mTitle->getNamespace();
4551                 $dbw = wfGetDB( DB_MASTER );
4552
4553                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4554                 # exist, we might legitimately not create it, but it's simpler to just
4555                 # create it and then give it a negative value, since the value is bogus
4556                 # anyway.
4557                 #
4558                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4559                 $insertCats = array_merge( $added, $deleted );
4560                 if ( !$insertCats ) {
4561                         # Okay, nothing to do
4562                         return;
4563                 }
4564
4565                 $insertRows = array();
4566
4567                 foreach ( $insertCats as $cat ) {
4568                         $insertRows[] = array(
4569                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4570                                 'cat_title' => $cat
4571                         );
4572                 }
4573                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4574
4575                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4576                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4577
4578                 if ( $ns == NS_CATEGORY ) {
4579                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4580                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4581                 } elseif ( $ns == NS_FILE ) {
4582                         $addFields[]    = 'cat_files = cat_files + 1';
4583                         $removeFields[] = 'cat_files = cat_files - 1';
4584                 }
4585
4586                 if ( $added ) {
4587                         $dbw->update(
4588                                 'category',
4589                                 $addFields,
4590                                 array( 'cat_title' => $added ),
4591                                 __METHOD__
4592                         );
4593                 }
4594
4595                 if ( $deleted ) {
4596                         $dbw->update(
4597                                 'category',
4598                                 $removeFields,
4599                                 array( 'cat_title' => $deleted ),
4600                                 __METHOD__
4601                         );
4602                 }
4603         }
4604
4605         /**
4606          * Lightweight method to get the parser output for a page, checking the parser cache
4607          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4608          * consider, so it's not appropriate to use there.
4609          *
4610          * @param $oldid mixed integer Revision ID or null
4611          */
4612         public function getParserOutput( $oldid = null ) {
4613                 global $wgEnableParserCache, $wgUser, $wgOut;
4614
4615                 // Should the parser cache be used?
4616                 $useParserCache = $wgEnableParserCache &&
4617                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
4618                         $this->exists() &&
4619                         $oldid === null;
4620
4621                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4622
4623                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
4624                         wfIncrStats( 'pcache_miss_stub' );
4625                 }
4626
4627                 $parserOutput = false;
4628                 if ( $useParserCache ) {
4629                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4630                 }
4631
4632                 if ( $parserOutput === false ) {
4633                         // Cache miss; parse and output it.
4634                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4635
4636                         return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
4637                 } else {
4638                         return $parserOutput;
4639                 }
4640         }
4641 }