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 $mDataLoaded = false;         // !<
  25         var $mForUpdate = false;          // !<
  26         var $mGoodAdjustment = 0;         // !<
  27         var $mIsRedirect = false;         // !<
  28         var $mLatest = false;             // !<
  29         var $mMinorEdit;                  // !<
  30         var $mOldId;                      // !<
  31         var $mPreparedEdit = false;       // !< Title object if set
  32         var $mRedirectedFrom = null;      // !< Title object if set
  33         var $mRedirectTarget = null;      // !< Title object if set
  34         var $mRedirectUrl = false;        // !<
  35         var $mRevIdFetched = 0;           // !<
  36         var $mRevision = null;            // !< Revision object if set
  37         var $mTimestamp = '';             // !<
  38         var $mTitle;                      // !< Title object
  39         var $mTotalAdjustment = 0;        // !<
  40         var $mTouched = '19700101000000'; // !<
  41         var $mUser = -1;                  // !< Not loaded
  42         var $mUserText = '';              // !< username from Revision if set
  43         var $mParserOptions;              // !< ParserOptions object
  44         var $mParserOutput;               // !< ParserCache object if set
  45         /**@}}*/
  46
  47         /**
  48          * Constructor and clear the article
  49          * @param $title Reference to a Title object.
  50          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  51          */
  52         public function __construct( Title $title, $oldId = null ) {
  53                 // FIXME: does the reference play any role here?
  54                 $this->mTitle =& $title;
  55                 $this->mOldId = $oldId;
  56         }
  57
  58         /**
  59          * Constructor from an page id
  60          * @param $id Int 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->isRedirect() ) {
  87                         return null;
  88                 }
  89
  90                 if ( $this->mRedirectTarget !== null ) {
  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', 'rd_fragment', 'rd_interwiki' ),
  98                         array( 'rd_from' => $this->getID() ),
  99                         __METHOD__
 100                 );
 101
 102                 // rd_fragment and rd_interwiki were added later, populate them if empty
 103                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 104                         return $this->mRedirectTarget = Title::makeTitle(
 105                                 $row->rd_namespace, $row->rd_title,
 106                                 $row->rd_fragment, $row->rd_interwiki );
 107                 }
 108
 109                 # This page doesn't have an entry in the redirect table
 110                 return $this->mRedirectTarget = $this->insertRedirect();
 111         }
 112
 113         /**
 114          * Insert an entry for this page into the redirect table.
 115          *
 116          * Don't call this function directly unless you know what you're doing.
 117          * @return Title object or null if not a redirect
 118          */
 119         public function insertRedirect() {
 120                 // recurse through to only get the final target
 121                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 122                 if ( !$retval ) {
 123                         return null;
 124                 }
 125                 $this->insertRedirectEntry( $retval );
 126                 return $retval;
 127         }
 128
 129         /**
 130          * Insert or update the redirect table entry for this page to indicate
 131          * it redirects to $rt .
 132          * @param $rt Title redirect target
 133          */
 134         public function insertRedirectEntry( $rt ) {
 135                 $dbw = wfGetDB( DB_MASTER );
 136                 $dbw->replace( 'redirect', array( 'rd_from' ),
 137                         array(
 138                                 'rd_from' => $this->getID(),
 139                                 'rd_namespace' => $rt->getNamespace(),
 140                                 'rd_title' => $rt->getDBkey(),
 141                                 'rd_fragment' => $rt->getFragment(),
 142                                 'rd_interwiki' => $rt->getInterwiki(),
 143                         ),
 144                         __METHOD__
 145                 );
 146         }
 147
 148         /**
 149          * Get the Title object or URL this page redirects to
 150          *
 151          * @return mixed false, Title of in-wiki target, or string with URL
 152          */
 153         public function followRedirect() {
 154                 return $this->getRedirectURL( $this->getRedirectTarget() );
 155         }
 156
 157         /**
 158          * Get the Title object this text redirects to
 159          *
 160          * @param $text string article content containing redirect info
 161          * @return mixed false, Title of in-wiki target, or string with URL
 162          * @deprecated since 1.17
 163          */
 164         public function followRedirectText( $text ) {
 165                 // recurse through to only get the final target
 166                 return $this->getRedirectURL( Title::newFromRedirectRecurse( $text ) );
 167         }
 168
 169         /**
 170          * Get the Title object or URL to use for a redirect. We use Title
 171          * objects for same-wiki, non-special redirects and URLs for everything
 172          * else.
 173          * @param $rt Title Redirect target
 174          * @return mixed false, Title object of local target, or string with URL
 175          */
 176         public function getRedirectURL( $rt ) {
 177                 if ( $rt ) {
 178                         if ( $rt->getInterwiki() != '' ) {
 179                                 if ( $rt->isLocal() ) {
 180                                         // Offsite wikis need an HTTP redirect.
 181                                         //
 182                                         // This can be hard to reverse and may produce loops,
 183                                         // so they may be disabled in the site configuration.
 184                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 185                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 186                                 }
 187                         } else {
 188                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 189                                         // Gotta handle redirects to special pages differently:
 190                                         // Fill the HTTP response "Location" header and ignore
 191                                         // the rest of the page we're on.
 192                                         //
 193                                         // This can be hard to reverse, so they may be disabled.
 194                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 195                                                 // rolleyes
 196                                         } else {
 197                                                 return $rt->getFullURL();
 198                                         }
 199                                 }
 200
 201                                 return $rt;
 202                         }
 203                 }
 204
 205                 // No or invalid redirect
 206                 return false;
 207         }
 208
 209         /**
 210          * Get the title object of the article
 211          * @return Title object of this page
 212          */
 213         public function getTitle() {
 214                 return $this->mTitle;
 215         }
 216
 217         /**
 218          * Clear the object
 219          * FIXME: shouldn't this be public?
 220          * @private
 221          */
 222         public function clear() {
 223                 $this->mDataLoaded    = false;
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mUser = $this->mCounter = -1; # Not loaded
 227                 $this->mRedirectedFrom = null; # Title object if set
 228                 $this->mRedirectTarget = null; # Title object if set
 229                 $this->mUserText =
 230                 $this->mTimestamp = $this->mComment = '';
 231                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 232                 $this->mTouched = '19700101000000';
 233                 $this->mForUpdate = false;
 234                 $this->mIsRedirect = false;
 235                 $this->mRevIdFetched = 0;
 236                 $this->mRedirectUrl = false;
 237                 $this->mLatest = false;
 238                 $this->mPreparedEdit = false;
 239         }
 240
 241         /**
 242          * Note that getContent/loadContent do not follow redirects anymore.
 243          * If you need to fetch redirectable content easily, try
 244          * the shortcut in Article::followRedirect()
 245          *
 246          * This function has side effects! Do not use this function if you
 247          * only want the real revision text if any.
 248          *
 249          * @return Return the text of this revision
 250          */
 251         public function getContent() {
 252                 global $wgUser;
 253
 254                 wfProfileIn( __METHOD__ );
 255
 256                 if ( $this->getID() === 0 ) {
 257                         # If this is a MediaWiki:x message, then load the messages
 258                         # and return the message value for x.
 259                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 260                                 $text = $this->mTitle->getDefaultMessageText();
 261                                 if ( $text === false ) {
 262                                         $text = '';
 263                                 }
 264                         } else {
 265                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 266                         }
 267                         wfProfileOut( __METHOD__ );
 268
 269                         return $text;
 270                 } else {
 271                         $this->loadContent();
 272                         wfProfileOut( __METHOD__ );
 273
 274                         return $this->mContent;
 275                 }
 276         }
 277
 278         /**
 279          * Get the text of the current revision. No side-effects...
 280          *
 281          * @return Return the text of the current revision
 282          */
 283         public function getRawText() {
 284                 // Check process cache for current revision
 285                 if ( $this->mContentLoaded && $this->mOldId == 0 ) {
 286                         return $this->mContent;
 287                 }
 288
 289                 $rev = Revision::newFromTitle( $this->mTitle );
 290                 $text = $rev ? $rev->getRawText() : false;
 291
 292                 return $text;
 293         }
 294
 295         /**
 296          * This function returns the text of a section, specified by a number ($section).
 297          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 298          * the first section before any such heading (section 0).
 299          *
 300          * If a section contains subsections, these are also returned.
 301          *
 302          * @param $text String: text to look in
 303          * @param $section Integer: section number
 304          * @return string text of the requested section
 305          * @deprecated
 306          */
 307         public function getSection( $text, $section ) {
 308                 global $wgParser;
 309                 return $wgParser->getSection( $text, $section );
 310         }
 311
 312         /**
 313          * Get the text that needs to be saved in order to undo all revisions
 314          * between $undo and $undoafter. Revisions must belong to the same page,
 315          * must exist and must not be deleted
 316          * @param $undo Revision
 317          * @param $undoafter Revision Must be an earlier revision than $undo
 318          * @return mixed string on success, false on failure
 319          */
 320         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 321                 $currentRev = Revision::newFromTitle( $this->mTitle );
 322                 if ( !$currentRev ) {
 323                         return false; // no page
 324                 }
 325                 $undo_text = $undo->getText();
 326                 $undoafter_text = $undoafter->getText();
 327                 $cur_text = $currentRev->getText();
 328
 329                 if ( $cur_text == $undo_text ) {
 330                         # No use doing a merge if it's just a straight revert.
 331                         return $undoafter_text;
 332                 }
 333
 334                 $undone_text = '';
 335
 336                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 337                         return false;
 338                 }
 339
 340                 return $undone_text;
 341         }
 342
 343         /**
 344          * @return int The oldid of the article that is to be shown, 0 for the
 345          *             current revision
 346          */
 347         public function getOldID() {
 348                 if ( is_null( $this->mOldId ) ) {
 349                         $this->mOldId = $this->getOldIDFromRequest();
 350                 }
 351
 352                 return $this->mOldId;
 353         }
 354
 355         /**
 356          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 357          *
 358          * @return int The old id for the request
 359          */
 360         public function getOldIDFromRequest() {
 361                 global $wgRequest;
 362
 363                 $this->mRedirectUrl = false;
 364
 365                 $oldid = $wgRequest->getVal( 'oldid' );
 366
 367                 if ( isset( $oldid ) ) {
 368                         $oldid = intval( $oldid );
 369                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 370                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 371                                 if ( $nextid ) {
 372                                         $oldid = $nextid;
 373                                 } else {
 374                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 375                                 }
 376                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 377                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 378                                 if ( $previd ) {
 379                                         $oldid = $previd;
 380                                 }
 381                         }
 382                 }
 383
 384                 if ( !$oldid ) {
 385                         $oldid = 0;
 386                 }
 387
 388                 return $oldid;
 389         }
 390
 391         /**
 392          * Load the revision (including text) into this object
 393          */
 394         function loadContent() {
 395                 if ( $this->mContentLoaded ) {
 396                         return;
 397                 }
 398
 399                 wfProfileIn( __METHOD__ );
 400
 401                 $this->fetchContent( $this->getOldID() );
 402
 403                 wfProfileOut( __METHOD__ );
 404         }
 405
 406         /**
 407          * Fetch a page record with the given conditions
 408          * @param $dbr Database object
 409          * @param $conditions Array
 410          * @return mixed Database result resource, or false on failure
 411          */
 412         protected function pageData( $dbr, $conditions ) {
 413                 $fields = array(
 414                                 'page_id',
 415                                 'page_namespace',
 416                                 'page_title',
 417                                 'page_restrictions',
 418                                 'page_counter',
 419                                 'page_is_redirect',
 420                                 'page_is_new',
 421                                 'page_random',
 422                                 'page_touched',
 423                                 'page_latest',
 424                                 'page_len',
 425                 );
 426
 427                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 428
 429                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 430
 431                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 432
 433                 return $row;
 434         }
 435
 436         /**
 437          * Fetch a page record matching the Title object's namespace and title
 438          * using a sanitized title string
 439          *
 440          * @param $dbr Database object
 441          * @param $title Title object
 442          * @return mixed Database result resource, or false on failure
 443          */
 444         public function pageDataFromTitle( $dbr, $title ) {
 445                 return $this->pageData( $dbr, array(
 446                         'page_namespace' => $title->getNamespace(),
 447                         'page_title'     => $title->getDBkey() ) );
 448         }
 449
 450         /**
 451          * Fetch a page record matching the requested ID
 452          *
 453          * @param $dbr Database
 454          * @param $id Integer
 455          */
 456         protected function pageDataFromId( $dbr, $id ) {
 457                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 458         }
 459
 460         /**
 461          * Set the general counter, title etc data loaded from
 462          * some source.
 463          *
 464          * @param $data Database row object or "fromdb"
 465          */
 466         public function loadPageData( $data = 'fromdb' ) {
 467                 if ( $data === 'fromdb' ) {
 468                         $dbr = wfGetDB( DB_SLAVE );
 469                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 470                 }
 471
 472                 $lc = LinkCache::singleton();
 473
 474                 if ( $data ) {
 475                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 476
 477                         $this->mTitle->mArticleID = intval( $data->page_id );
 478
 479                         # Old-fashioned restrictions
 480                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 481
 482                         $this->mCounter     = intval( $data->page_counter );
 483                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 484                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 485                         $this->mLatest      = intval( $data->page_latest );
 486                 } else {
 487                         $lc->addBadLinkObj( $this->mTitle );
 488                         $this->mTitle->mArticleID = 0;
 489                 }
 490
 491                 $this->mDataLoaded = true;
 492         }
 493
 494         /**
 495          * Get text of an article from database
 496          * Does *NOT* follow redirects.
 497          *
 498          * @param $oldid Int: 0 for whatever the latest revision is
 499          * @return mixed string containing article contents, or false if null
 500          */
 501         function fetchContent( $oldid = 0 ) {
 502                 if ( $this->mContentLoaded ) {
 503                         return $this->mContent;
 504                 }
 505
 506                 # Pre-fill content with error message so that if something
 507                 # fails we'll have something telling us what we intended.
 508                 $t = $this->mTitle->getPrefixedText();
 509                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 510                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 511
 512                 if ( $oldid ) {
 513                         $revision = Revision::newFromId( $oldid );
 514                         if ( $revision === null ) {
 515                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 516                                 return false;
 517                         }
 518
 519                         if ( !$this->mDataLoaded || $this->getID() != $revision->getPage() ) {
 520                                 $data = $this->pageDataFromId( wfGetDB( DB_SLAVE ), $revision->getPage() );
 521
 522                                 if ( !$data ) {
 523                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 524                                         return false;
 525                                 }
 526
 527                                 $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 528                                 $this->loadPageData( $data );
 529                         }
 530                 } else {
 531                         if ( !$this->mDataLoaded ) {
 532                                 $this->loadPageData();
 533                         }
 534
 535                         if ( $this->mLatest === false ) {
 536                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 537                                 return false;
 538                         }
 539
 540                         $revision = Revision::newFromId( $this->mLatest );
 541                         if ( $revision === null ) {
 542                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id {$this->mLatest}\n" );
 543                                 return false;
 544                         }
 545                 }
 546
 547                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 548                 // We should instead work with the Revision object when we need it...
 549                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 550
 551                 if ( $revision->getId() == $this->mLatest ) {
 552                         $this->setLastEdit( $revision );
 553                 }
 554
 555                 $this->mRevIdFetched = $revision->getId();
 556                 $this->mContentLoaded = true;
 557                 $this->mRevision =& $revision;
 558
 559                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 560
 561                 return $this->mContent;
 562         }
 563
 564         /**
 565          * Read/write accessor to select FOR UPDATE
 566          *
 567          * @param $x Mixed: FIXME
 568          * @return mixed value of $x, or value stored in Article::mForUpdate
 569          */
 570         public function forUpdate( $x = null ) {
 571                 return wfSetVar( $this->mForUpdate, $x );
 572         }
 573
 574         /**
 575          * Get options for all SELECT statements
 576          *
 577          * @param $options Array: an optional options array which'll be appended to
 578          *                       the default
 579          * @return Array: options
 580          */
 581         protected function getSelectOptions( $options = '' ) {
 582                 if ( $this->mForUpdate ) {
 583                         if ( is_array( $options ) ) {
 584                                 $options[] = 'FOR UPDATE';
 585                         } else {
 586                                 $options = 'FOR UPDATE';
 587                         }
 588                 }
 589
 590                 return $options;
 591         }
 592
 593         /**
 594          * @return int Page ID
 595          */
 596         public function getID() {
 597                 return $this->mTitle->getArticleID();
 598         }
 599
 600         /**
 601          * @return bool Whether or not the page exists in the database
 602          */
 603         public function exists() {
 604                 return $this->getId() > 0;
 605         }
 606
 607         /**
 608          * Check if this page is something we're going to be showing
 609          * some sort of sensible content for. If we return false, page
 610          * views (plain action=view) will return an HTTP 404 response,
 611          * so spiders and robots can know they're following a bad link.
 612          *
 613          * @return bool
 614          */
 615         public function hasViewableContent() {
 616                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 617         }
 618
 619         /**
 620          * @return int The view count for the page
 621          */
 622         public function getCount() {
 623                 if ( -1 == $this->mCounter ) {
 624                         $id = $this->getID();
 625
 626                         if ( $id == 0 ) {
 627                                 $this->mCounter = 0;
 628                         } else {
 629                                 $dbr = wfGetDB( DB_SLAVE );
 630                                 $this->mCounter = $dbr->selectField( 'page',
 631                                         'page_counter',
 632                                         array( 'page_id' => $id ),
 633                                         __METHOD__,
 634                                         $this->getSelectOptions()
 635                                 );
 636                         }
 637                 }
 638
 639                 return $this->mCounter;
 640         }
 641
 642         /**
 643          * Determine whether a page would be suitable for being counted as an
 644          * article in the site_stats table based on the title & its content
 645          *
 646          * @param $text String: text to analyze
 647          * @return bool
 648          */
 649         public function isCountable( $text ) {
 650                 global $wgUseCommaCount;
 651
 652                 $token = $wgUseCommaCount ? ',' : '[[';
 653
 654                 return $this->mTitle->isContentPage() && !$this->isRedirect( $text ) && in_string( $token, $text );
 655         }
 656
 657         /**
 658          * Tests if the article text represents a redirect
 659          *
 660          * @param $text mixed string containing article contents, or boolean
 661          * @return bool
 662          */
 663         public function isRedirect( $text = false ) {
 664                 if ( $text === false ) {
 665                         if ( !$this->mDataLoaded ) {
 666                                 $this->loadPageData();
 667                         }
 668
 669                         return (bool)$this->mIsRedirect;
 670                 } else {
 671                         return Title::newFromRedirect( $text ) !== null;
 672                 }
 673         }
 674
 675         /**
 676          * Returns true if the currently-referenced revision is the current edit
 677          * to this page (and it exists).
 678          * @return bool
 679          */
 680         public function isCurrent() {
 681                 # If no oldid, this is the current version.
 682                 if ( $this->getOldID() == 0 ) {
 683                         return true;
 684                 }
 685
 686                 return $this->exists() && $this->mRevision && $this->mRevision->isCurrent();
 687         }
 688
 689         /**
 690          * Loads everything except the text
 691          * This isn't necessary for all uses, so it's only done if needed.
 692          */
 693         protected function loadLastEdit() {
 694                 if ( -1 != $this->mUser ) {
 695                         return;
 696                 }
 697
 698                 # New or non-existent articles have no user information
 699                 $id = $this->getID();
 700                 if ( 0 == $id ) {
 701                         return;
 702                 }
 703
 704                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 705                 if ( !is_null( $revision ) ) {
 706                         $this->setLastEdit( $revision );
 707                 }
 708         }
 709
 710         /**
 711          * Set the latest revision
 712          */
 713         protected function setLastEdit( Revision $revision ) {
 714                 $this->mLastRevision = $revision;
 715                 $this->mUser = $revision->getUser();
 716                 $this->mUserText = $revision->getUserText();
 717                 $this->mTimestamp = $revision->getTimestamp();
 718                 $this->mComment = $revision->getComment();
 719                 $this->mMinorEdit = $revision->isMinor();
 720         }
 721
 722         /**
 723          * @return string GMT timestamp of last article revision
 724          */
 725         public function getTimestamp() {
 726                 // Check if the field has been filled by ParserCache::get()
 727                 if ( !$this->mTimestamp ) {
 728                         $this->loadLastEdit();
 729                 }
 730
 731                 return wfTimestamp( TS_MW, $this->mTimestamp );
 732         }
 733
 734         /**
 735          * @return int user ID for the user that made the last article revision
 736          */
 737         public function getUser() {
 738                 $this->loadLastEdit();
 739                 return $this->mUser;
 740         }
 741
 742         /**
 743          * @return string username of the user that made the last article revision
 744          */
 745         public function getUserText() {
 746                 $this->loadLastEdit();
 747                 return $this->mUserText;
 748         }
 749
 750         /**
 751          * @return string Comment stored for the last article revision
 752          */
 753         public function getComment() {
 754                 $this->loadLastEdit();
 755                 return $this->mComment;
 756         }
 757
 758         /**
 759          * Returns true if last revision was marked as "minor edit"
 760          *
 761          * @return boolean Minor edit indicator for the last article revision.
 762          */
 763         public function getMinorEdit() {
 764                 $this->loadLastEdit();
 765                 return $this->mMinorEdit;
 766         }
 767
 768         /**
 769          * Use this to fetch the rev ID used on page views
 770          *
 771          * @return int revision ID of last article revision
 772          */
 773         public function getRevIdFetched() {
 774                 if ( $this->mRevIdFetched ) {
 775                         return $this->mRevIdFetched;
 776                 } else {
 777                         return $this->getLatest();
 778                 }
 779         }
 780
 781         /**
 782          * FIXME: this does what?
 783          * @param $limit Integer: default 0.
 784          * @param $offset Integer: default 0.
 785          * @return UserArrayFromResult object with User objects of article contributors for requested range
 786          */
 787         public function getContributors( $limit = 0, $offset = 0 ) {
 788                 # FIXME: this is expensive; cache this info somewhere.
 789
 790                 $dbr = wfGetDB( DB_SLAVE );
 791                 $revTable = $dbr->tableName( 'revision' );
 792                 $userTable = $dbr->tableName( 'user' );
 793
 794                 $pageId = $this->getId();
 795
 796                 $user = $this->getUser();
 797
 798                 if ( $user ) {
 799                         $excludeCond = "AND rev_user != $user";
 800                 } else {
 801                         $userText = $dbr->addQuotes( $this->getUserText() );
 802                         $excludeCond = "AND rev_user_text != $userText";
 803                 }
 804
 805                 $deletedBit = $dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER ); // username hidden?
 806
 807                 $sql = "SELECT {$userTable}.*, rev_user_text as user_name, MAX(rev_timestamp) as timestamp
 808                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 809                         WHERE rev_page = $pageId
 810                         $excludeCond
 811                         AND $deletedBit = 0
 812                         GROUP BY rev_user, rev_user_text
 813                         ORDER BY timestamp DESC";
 814
 815                 if ( $limit > 0 ) {
 816                         $sql = $dbr->limitResult( $sql, $limit, $offset );
 817                 }
 818
 819                 $sql .= ' ' . $this->getSelectOptions();
 820                 $res = $dbr->query( $sql, __METHOD__ );
 821
 822                 return new UserArrayFromResult( $res );
 823         }
 824
 825         /**
 826          * This is the default action of the index.php entry point: just view the
 827          * page of the given title.
 828          */
 829         public function view() {
 830                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 831                 global $wgUseFileCache, $wgUseETag;
 832
 833                 wfProfileIn( __METHOD__ );
 834
 835                 # Get variables from query string
 836                 $oldid = $this->getOldID();
 837
 838                 # getOldID may want us to redirect somewhere else
 839                 if ( $this->mRedirectUrl ) {
 840                         $wgOut->redirect( $this->mRedirectUrl );
 841                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 842                         wfProfileOut( __METHOD__ );
 843
 844                         return;
 845                 }
 846
 847                 $wgOut->setArticleFlag( true );
 848                 # Set page title (may be overridden by DISPLAYTITLE)
 849                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 850
 851                 # If we got diff in the query, we want to see a diff page instead of the article.
 852                 if ( $wgRequest->getCheck( 'diff' ) ) {
 853                         wfDebug( __METHOD__ . ": showing diff page\n" );
 854                         $this->showDiffPage();
 855                         wfProfileOut( __METHOD__ );
 856
 857                         return;
 858                 }
 859
 860                 # Allow frames by default
 861                 $wgOut->allowClickjacking();
 862
 863                 $parserCache = ParserCache::singleton();
 864
 865                 $parserOptions = $this->getParserOptions();
 866                 # Render printable version, use printable version cache
 867                 if ( $wgOut->isPrintable() ) {
 868                         $parserOptions->setIsPrintable( true );
 869                         $parserOptions->setEditSection( false );
 870                 } else if ( $wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 871                         $parserOptions->setEditSection( false );
 872                 }
 873
 874                 # Try client and file cache
 875                 if ( $oldid === 0 && $this->checkTouched() ) {
 876                         if ( $wgUseETag ) {
 877                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 878                         }
 879
 880                         # Is it client cached?
 881                         if ( $wgOut->checkLastModified( $this->getTouched() ) ) {
 882                                 wfDebug( __METHOD__ . ": done 304\n" );
 883                                 wfProfileOut( __METHOD__ );
 884
 885                                 return;
 886                         # Try file cache
 887                         } else if ( $wgUseFileCache && $this->tryFileCache() ) {
 888                                 wfDebug( __METHOD__ . ": done file cache\n" );
 889                                 # tell wgOut that output is taken care of
 890                                 $wgOut->disable();
 891                                 $this->viewUpdates();
 892                                 wfProfileOut( __METHOD__ );
 893
 894                                 return;
 895                         }
 896                 }
 897
 898                 if ( !$wgUseETag && !$this->mTitle->quickUserCan( 'edit' ) ) {
 899                         $parserOptions->setEditSection( false );
 900                 }
 901
 902                 # Should the parser cache be used?
 903                 $useParserCache = $this->useParserCache( $oldid );
 904                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 905                 if ( $wgUser->getStubThreshold() ) {
 906                         wfIncrStats( 'pcache_miss_stub' );
 907                 }
 908
 909                 $wasRedirected = $this->showRedirectedFromHeader();
 910                 $this->showNamespaceHeader();
 911
 912                 # Iterate through the possible ways of constructing the output text.
 913                 # Keep going until $outputDone is set, or we run out of things to do.
 914                 $pass = 0;
 915                 $outputDone = false;
 916                 $this->mParserOutput = false;
 917
 918                 while ( !$outputDone && ++$pass ) {
 919                         switch( $pass ) {
 920                                 case 1:
 921                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 922                                         break;
 923                                 case 2:
 924                                         # Try the parser cache
 925                                         if ( $useParserCache ) {
 926                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 927
 928                                                 if ( $this->mParserOutput !== false ) {
 929                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 930                                                         $wgOut->addParserOutput( $this->mParserOutput );
 931                                                         # Ensure that UI elements requiring revision ID have
 932                                                         # the correct version information.
 933                                                         $wgOut->setRevisionId( $this->mLatest );
 934                                                         $outputDone = true;
 935                                                 }
 936                                         }
 937                                         break;
 938                                 case 3:
 939                                         $text = $this->getContent();
 940                                         if ( $text === false || $this->getID() == 0 ) {
 941                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 942                                                 $this->showMissingArticle();
 943                                                 wfProfileOut( __METHOD__ );
 944                                                 return;
 945                                         }
 946
 947                                         # Another whitelist check in case oldid is altering the title
 948                                         if ( !$this->mTitle->userCanRead() ) {
 949                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 950                                                 $wgOut->loginToUse();
 951                                                 $wgOut->output();
 952                                                 $wgOut->disable();
 953                                                 wfProfileOut( __METHOD__ );
 954                                                 return;
 955                                         }
 956
 957                                         # Are we looking at an old revision
 958                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 959                                                 $this->setOldSubtitle( $oldid );
 960
 961                                                 if ( !$this->showDeletedRevisionHeader() ) {
 962                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 963                                                         wfProfileOut( __METHOD__ );
 964                                                         return;
 965                                                 }
 966
 967                                                 # If this "old" version is the current, then try the parser cache...
 968                                                 if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
 969                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 970                                                         if ( $this->mParserOutput ) {
 971                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 972                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 973                                                                 $wgOut->setRevisionId( $this->mLatest );
 974                                                                 $outputDone = true;
 975                                                                 break;
 976                                                         }
 977                                                 }
 978                                         }
 979
 980                                         # Ensure that UI elements requiring revision ID have
 981                                         # the correct version information.
 982                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 983
 984                                         # Pages containing custom CSS or JavaScript get special treatment
 985                                         if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 986                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 987                                                 $this->showCssOrJsPage();
 988                                                 $outputDone = true;
 989                                         } else {
 990                                                 $rt = Title::newFromRedirectArray( $text );
 991                                                 if ( $rt ) {
 992                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 993                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 994                                                         # Don't append the subtitle if this was an old revision
 995                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 996                                                         # Parse just to get categories, displaytitle, etc.
 997                                                         $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
 998                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 999                                                         $outputDone = true;
1000                                                 }
1001                                         }
1002                                         break;
1003                                 case 4:
1004                                         # Run the parse, protected by a pool counter
1005                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
1006
1007                                         $key = $parserCache->getKey( $this, $parserOptions );
1008                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
1009
1010                                         if ( !$poolArticleView->execute() ) {
1011                                                 # Connection or timeout error
1012                                                 wfProfileOut( __METHOD__ );
1013                                                 return;
1014                                         } else {
1015                                                 $outputDone = true;
1016                                         }
1017                                         break;
1018                                 # Should be unreachable, but just in case...
1019                                 default:
1020                                         break 2;
1021                         }
1022                 }
1023
1024                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
1025                 if ( $this->mParserOutput ) {
1026                         $titleText = $this->mParserOutput->getTitleText();
1027
1028                         if ( strval( $titleText ) !== '' ) {
1029                                 $wgOut->setPageTitle( $titleText );
1030                         }
1031                 }
1032
1033                 # For the main page, overwrite the <title> element with the con-
1034                 # tents of 'pagetitle-view-mainpage' instead of the default (if
1035                 # that's not empty).
1036                 # This message always exists because it is in the i18n files
1037                 if ( $this->mTitle->equals( Title::newMainPage() ) ) {
1038                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
1039                         if ( !$msg->isDisabled() ) {
1040                                 $wgOut->setHTMLTitle( $msg->title( $this->mTitle )->text() );
1041                         }
1042                 }
1043
1044                 # Now that we've filled $this->mParserOutput, we know whether
1045                 # there are any __NOINDEX__ tags on the page
1046                 $policy = $this->getRobotPolicy( 'view' );
1047                 $wgOut->setIndexPolicy( $policy['index'] );
1048                 $wgOut->setFollowPolicy( $policy['follow'] );
1049
1050                 $this->showViewFooter();
1051                 $this->viewUpdates();
1052                 wfProfileOut( __METHOD__ );
1053         }
1054
1055         /**
1056          * Show a diff page according to current request variables. For use within
1057          * Article::view() only, other callers should use the DifferenceEngine class.
1058          */
1059         public function showDiffPage() {
1060                 global $wgRequest, $wgUser;
1061
1062                 $diff = $wgRequest->getVal( 'diff' );
1063                 $rcid = $wgRequest->getVal( 'rcid' );
1064                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
1065                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1066                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1067                 $oldid = $this->getOldID();
1068
1069                 $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $unhide );
1070                 // DifferenceEngine directly fetched the revision:
1071                 $this->mRevIdFetched = $de->mNewid;
1072                 $de->showDiffPage( $diffOnly );
1073
1074                 if ( $diff == 0 || $diff == $this->getLatest() ) {
1075                         # Run view updates for current revision only
1076                         $this->viewUpdates();
1077                 }
1078         }
1079
1080         /**
1081          * Show a page view for a page formatted as CSS or JavaScript. To be called by
1082          * Article::view() only.
1083          *
1084          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
1085          * page views.
1086          */
1087         protected function showCssOrJsPage() {
1088                 global $wgOut;
1089
1090                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache'>\n$1\n</div>", 'clearyourcache' );
1091
1092                 // Give hooks a chance to customise the output
1093                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
1094                         // Wrap the whole lot in a <pre> and don't parse
1095                         $m = array();
1096                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
1097                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
1098                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
1099                         $wgOut->addHTML( "\n</pre>\n" );
1100                 }
1101         }
1102
1103         /**
1104          * Get the robot policy to be used for the current view
1105          * @param $action String the action= GET parameter
1106          * @return Array the policy that should be set
1107          * TODO: actions other than 'view'
1108          */
1109         public function getRobotPolicy( $action ) {
1110                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
1111                 global $wgDefaultRobotPolicy, $wgRequest;
1112
1113                 $ns = $this->mTitle->getNamespace();
1114
1115                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
1116                         # Don't index user and user talk pages for blocked users (bug 11443)
1117                         if ( !$this->mTitle->isSubpage() ) {
1118                                 if ( Block::newFromTarget( null, $this->mTitle->getText() ) instanceof Block ) {
1119                                         return array(
1120                                                 'index'  => 'noindex',
1121                                                 'follow' => 'nofollow'
1122                                         );
1123                                 }
1124                         }
1125                 }
1126
1127                 if ( $this->getID() === 0 || $this->getOldID() ) {
1128                         # Non-articles (special pages etc), and old revisions
1129                         return array(
1130                                 'index'  => 'noindex',
1131                                 'follow' => 'nofollow'
1132                         );
1133                 } elseif ( $wgOut->isPrintable() ) {
1134                         # Discourage indexing of printable versions, but encourage following
1135                         return array(
1136                                 'index'  => 'noindex',
1137                                 'follow' => 'follow'
1138                         );
1139                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
1140                         # For ?curid=x urls, disallow indexing
1141                         return array(
1142                                 'index'  => 'noindex',
1143                                 'follow' => 'follow'
1144                         );
1145                 }
1146
1147                 # Otherwise, construct the policy based on the various config variables.
1148                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
1149
1150                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
1151                         # Honour customised robot policies for this namespace
1152                         $policy = array_merge(
1153                                 $policy,
1154                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
1155                         );
1156                 }
1157                 if ( $this->mTitle->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
1158                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
1159                         # a final sanity check that we have really got the parser output.
1160                         $policy = array_merge(
1161                                 $policy,
1162                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
1163                         );
1164                 }
1165
1166                 if ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
1167                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
1168                         $policy = array_merge(
1169                                 $policy,
1170                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] )
1171                         );
1172                 }
1173
1174                 return $policy;
1175         }
1176
1177         /**
1178          * Converts a String robot policy into an associative array, to allow
1179          * merging of several policies using array_merge().
1180          * @param $policy Mixed, returns empty array on null/false/'', transparent
1181          *            to already-converted arrays, converts String.
1182          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
1183          */
1184         public static function formatRobotPolicy( $policy ) {
1185                 if ( is_array( $policy ) ) {
1186                         return $policy;
1187                 } elseif ( !$policy ) {
1188                         return array();
1189                 }
1190
1191                 $policy = explode( ',', $policy );
1192                 $policy = array_map( 'trim', $policy );
1193
1194                 $arr = array();
1195                 foreach ( $policy as $var ) {
1196                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
1197                                 $arr['index'] = $var;
1198                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
1199                                 $arr['follow'] = $var;
1200                         }
1201                 }
1202
1203                 return $arr;
1204         }
1205
1206         /**
1207          * If this request is a redirect view, send "redirected from" subtitle to
1208          * $wgOut. Returns true if the header was needed, false if this is not a
1209          * redirect view. Handles both local and remote redirects.
1210          *
1211          * @return boolean
1212          */
1213         public function showRedirectedFromHeader() {
1214                 global $wgOut, $wgUser, $wgRequest, $wgRedirectSources;
1215
1216                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
1217
1218                 if ( isset( $this->mRedirectedFrom ) ) {
1219                         // This is an internally redirected page view.
1220                         // We'll need a backlink to the source page for navigation.
1221                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
1222                                 $redir = $wgUser->getSkin()->link(
1223                                         $this->mRedirectedFrom,
1224                                         null,
1225                                         array(),
1226                                         array( 'redirect' => 'no' ),
1227                                         array( 'known', 'noclasses' )
1228                                 );
1229
1230                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1231                                 $wgOut->setSubtitle( $s );
1232
1233                                 // Set the fragment if one was specified in the redirect
1234                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
1235                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
1236                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
1237                                 }
1238
1239                                 // Add a <link rel="canonical"> tag
1240                                 $wgOut->addLink( array( 'rel' => 'canonical',
1241                                         'href' => $this->mTitle->getLocalURL() )
1242                                 );
1243
1244                                 return true;
1245                         }
1246                 } elseif ( $rdfrom ) {
1247                         // This is an externally redirected view, from some other wiki.
1248                         // If it was reported from a trusted site, supply a backlink.
1249                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1250                                 $redir = $wgUser->getSkin()->makeExternalLink( $rdfrom, $rdfrom );
1251                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
1252                                 $wgOut->setSubtitle( $s );
1253
1254                                 return true;
1255                         }
1256                 }
1257
1258                 return false;
1259         }
1260
1261         /**
1262          * Show a header specific to the namespace currently being viewed, like
1263          * [[MediaWiki:Talkpagetext]]. For Article::view().
1264          */
1265         public function showNamespaceHeader() {
1266                 global $wgOut;
1267
1268                 if ( $this->mTitle->isTalkPage() ) {
1269                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1270                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
1271                         }
1272                 }
1273         }
1274
1275         /**
1276          * Show the footer section of an ordinary page view
1277          */
1278         public function showViewFooter() {
1279                 global $wgOut, $wgUseTrackbacks;
1280
1281                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1282                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1283                         $wgOut->addWikiMsg( 'anontalkpagetext' );
1284                 }
1285
1286                 # If we have been passed an &rcid= parameter, we want to give the user a
1287                 # chance to mark this new article as patrolled.
1288                 $this->showPatrolFooter();
1289
1290                 # Trackbacks
1291                 if ( $wgUseTrackbacks ) {
1292                         $this->addTrackbacks();
1293                 }
1294
1295                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
1296
1297         }
1298
1299         /**
1300          * If patrol is possible, output a patrol UI box. This is called from the
1301          * footer section of ordinary page views. If patrol is not possible or not
1302          * desired, does nothing.
1303          */
1304         public function showPatrolFooter() {
1305                 global $wgOut, $wgRequest, $wgUser;
1306
1307                 $rcid = $wgRequest->getVal( 'rcid' );
1308
1309                 if ( !$rcid || !$this->mTitle->quickUserCan( 'patrol' ) ) {
1310                         return;
1311                 }
1312
1313                 $sk = $wgUser->getSkin();
1314                 $token = $wgUser->editToken( $rcid );
1315                 $wgOut->preventClickjacking();
1316
1317                 $wgOut->addHTML(
1318                         "<div class='patrollink'>" .
1319                                 wfMsgHtml(
1320                                         'markaspatrolledlink',
1321                                         $sk->link(
1322                                                 $this->mTitle,
1323                                                 wfMsgHtml( 'markaspatrolledtext' ),
1324                                                 array(),
1325                                                 array(
1326                                                         'action' => 'markpatrolled',
1327                                                         'rcid' => $rcid,
1328                                                         'token' => $token,
1329                                                 ),
1330                                                 array( 'known', 'noclasses' )
1331                                         )
1332                                 ) .
1333                         '</div>'
1334                 );
1335         }
1336
1337         /**
1338          * Show the error text for a missing article. For articles in the MediaWiki
1339          * namespace, show the default message text. To be called from Article::view().
1340          */
1341         public function showMissingArticle() {
1342                 global $wgOut, $wgRequest, $wgUser;
1343
1344                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1345                 if ( $this->mTitle->getNamespace() == NS_USER || $this->mTitle->getNamespace() == NS_USER_TALK ) {
1346                         $parts = explode( '/', $this->mTitle->getText() );
1347                         $rootPart = $parts[0];
1348                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1349                         $ip = User::isIP( $rootPart );
1350
1351                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
1352                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1353                                         array( 'userpage-userdoesnotexist-view', $rootPart ) );
1354                         } else if ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1355                                 LogEventsList::showLogExtract(
1356                                         $wgOut,
1357                                         'block',
1358                                         $user->getUserPage()->getPrefixedText(),
1359                                         '',
1360                                         array(
1361                                                 'lim' => 1,
1362                                                 'showIfEmpty' => false,
1363                                                 'msgKey' => array(
1364                                                         'blocked-notice-logextract',
1365                                                         $user->getName() # Support GENDER in notice
1366                                                 )
1367                                         )
1368                                 );
1369                         }
1370                 }
1371
1372                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1373
1374                 # Show delete and move logs
1375                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle->getPrefixedText(), '',
1376                         array(  'lim' => 10,
1377                                 'conds' => array( "log_action != 'revision'" ),
1378                                 'showIfEmpty' => false,
1379                                 'msgKey' => array( 'moveddeleted-notice' ) )
1380                 );
1381
1382                 # Show error message
1383                 $oldid = $this->getOldID();
1384                 if ( $oldid ) {
1385                         $text = wfMsgNoTrans( 'missing-article',
1386                                 $this->mTitle->getPrefixedText(),
1387                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
1388                 } elseif ( $this->mTitle->getNamespace() === NS_MEDIAWIKI ) {
1389                         // Use the default message text
1390                         $text = $this->mTitle->getDefaultMessageText();
1391                 } else {
1392                         $createErrors = $this->mTitle->getUserPermissionsErrors( 'create', $wgUser );
1393                         $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
1394                         $errors = array_merge( $createErrors, $editErrors );
1395
1396                         if ( !count( $errors ) ) {
1397                                 $text = wfMsgNoTrans( 'noarticletext' );
1398                         } else {
1399                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
1400                         }
1401                 }
1402                 $text = "<div class='noarticletext'>\n$text\n</div>";
1403
1404                 if ( !$this->hasViewableContent() ) {
1405                         // If there's no backing content, send a 404 Not Found
1406                         // for better machine handling of broken links.
1407                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
1408                 }
1409
1410                 $wgOut->addWikiText( $text );
1411         }
1412
1413         /**
1414          * If the revision requested for view is deleted, check permissions.
1415          * Send either an error message or a warning header to $wgOut.
1416          *
1417          * @return boolean true if the view is allowed, false if not.
1418          */
1419         public function showDeletedRevisionHeader() {
1420                 global $wgOut, $wgRequest;
1421
1422                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1423                         // Not deleted
1424                         return true;
1425                 }
1426
1427                 // If the user is not allowed to see it...
1428                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
1429                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1430                                 'rev-deleted-text-permission' );
1431
1432                         return false;
1433                 // If the user needs to confirm that they want to see it...
1434                 } else if ( $wgRequest->getInt( 'unhide' ) != 1 ) {
1435                         # Give explanation and add a link to view the revision...
1436                         $oldid = intval( $this->getOldID() );
1437                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
1438                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1439                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1440                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1441                                 array( $msg, $link ) );
1442
1443                         return false;
1444                 // We are allowed to see...
1445                 } else {
1446                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1447                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1448                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1449
1450                         return true;
1451                 }
1452         }
1453
1454         /**
1455          * Should the parser cache be used?
1456          *
1457          * @return boolean
1458          */
1459         public function useParserCache( $oldid ) {
1460                 global $wgUser, $wgEnableParserCache;
1461
1462                 return $wgEnableParserCache
1463                         && $wgUser->getStubThreshold() == 0
1464                         && $this->exists()
1465                         && empty( $oldid )
1466                         && !$this->mTitle->isCssOrJsPage()
1467                         && !$this->mTitle->isCssJsSubpage();
1468         }
1469
1470         /**
1471          * Execute the uncached parse for action=view
1472          */
1473         public function doViewParse() {
1474                 global $wgOut;
1475
1476                 $oldid = $this->getOldID();
1477                 $parserOptions = $this->getParserOptions();
1478
1479                 # Render printable version, use printable version cache
1480                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1481
1482                 # Don't show section-edit links on old revisions... this way lies madness.
1483                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->mTitle->quickUserCan( 'edit' ) ) {
1484                         $parserOptions->setEditSection( false );
1485                 }
1486
1487                 $useParserCache = $this->useParserCache( $oldid );
1488                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1489
1490                 return true;
1491         }
1492
1493         /**
1494          * Try to fetch an expired entry from the parser cache. If it is present,
1495          * output it and return true. If it is not present, output nothing and
1496          * return false. This is used as a callback function for
1497          * PoolCounter::executeProtected().
1498          *
1499          * @return boolean
1500          */
1501         public function tryDirtyCache() {
1502                 global $wgOut;
1503                 $parserCache = ParserCache::singleton();
1504                 $options = $this->getParserOptions();
1505
1506                 if ( $wgOut->isPrintable() ) {
1507                         $options->setIsPrintable( true );
1508                         $options->setEditSection( false );
1509                 }
1510
1511                 $output = $parserCache->getDirty( $this, $options );
1512
1513                 if ( $output ) {
1514                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1515                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1516                         $wgOut->setSquidMaxage( 0 );
1517                         $this->mParserOutput = $output;
1518                         $wgOut->addParserOutput( $output );
1519                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1520
1521                         return true;
1522                 } else {
1523                         wfDebugLog( 'dirty', "dirty missing\n" );
1524                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1525
1526                         return false;
1527                 }
1528         }
1529
1530         /**
1531          * View redirect
1532          *
1533          * @param $target Title|Array of destination(s) to redirect
1534          * @param $appendSubtitle Boolean [optional]
1535          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1536          * @return string containing HMTL with redirect link
1537          */
1538         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1539                 global $wgOut, $wgContLang, $wgStylePath, $wgUser;
1540
1541                 if ( !is_array( $target ) ) {
1542                         $target = array( $target );
1543                 }
1544
1545                 $imageDir = $wgContLang->getDir();
1546
1547                 if ( $appendSubtitle ) {
1548                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1549                 }
1550
1551                 $sk = $wgUser->getSkin();
1552                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1553                 $title = array_shift( $target );
1554
1555                 if ( $forceKnown ) {
1556                         $link = $sk->linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1557                 } else {
1558                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1559                 }
1560
1561                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1562                 $alt = $wgContLang->isRTL() ? '←' : '→';
1563                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1564                 foreach ( $target as $rt ) {
1565                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1566                         if ( $forceKnown ) {
1567                                 $link .= $sk->linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1568                         } else {
1569                                 $link .= $sk->link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1570                         }
1571                 }
1572
1573                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1574                 return '<div class="redirectMsg">' .
1575                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1576                         '<span class="redirectText">' . $link . '</span></div>';
1577         }
1578
1579         /**
1580          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1581          */
1582         public function addTrackbacks() {
1583                 global $wgOut;
1584
1585                 $dbr = wfGetDB( DB_SLAVE );
1586                 $tbs = $dbr->select( 'trackbacks',
1587                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1588                         array( 'tb_page' => $this->getID() )
1589                 );
1590
1591                 if ( !$dbr->numRows( $tbs ) ) {
1592                         return;
1593                 }
1594
1595                 $wgOut->preventClickjacking();
1596
1597                 $tbtext = "";
1598                 foreach ( $tbs as $o ) {
1599                         $rmvtxt = "";
1600
1601                         if ( $wgOut->getUser()->isAllowed( 'trackback' ) ) {
1602                                 $delurl = $this->mTitle->getFullURL( "action=deletetrackback&tbid=" .
1603                                         $o->tb_id . "&token=" . urlencode( $wgOut->getUser()->editToken() ) );
1604                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1605                         }
1606
1607                         $tbtext .= "\n";
1608                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1609                                         $o->tb_title,
1610                                         $o->tb_url,
1611                                         $o->tb_ex,
1612                                         $o->tb_name,
1613                                         $rmvtxt );
1614                 }
1615
1616                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1617         }
1618
1619         /**
1620          * Removes trackback record for current article from trackbacks table
1621          */
1622         public function deletetrackback() {
1623                 global $wgRequest, $wgOut;
1624
1625                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ) ) ) {
1626                         $wgOut->addWikiMsg( 'sessionfailure' );
1627
1628                         return;
1629                 }
1630
1631                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
1632
1633                 if ( count( $permission_errors ) ) {
1634                         $wgOut->showPermissionsErrorPage( $permission_errors );
1635
1636                         return;
1637                 }
1638
1639                 $db = wfGetDB( DB_MASTER );
1640                 $db->delete( 'trackbacks', array( 'tb_id' => $wgRequest->getInt( 'tbid' ) ) );
1641
1642                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1643                 $this->mTitle->invalidateCache();
1644         }
1645
1646         /**
1647          * Handle action=render
1648          */
1649
1650         public function render() {
1651                 global $wgOut;
1652
1653                 $wgOut->setArticleBodyOnly( true );
1654                 $this->view();
1655         }
1656
1657         /**
1658          * Handle action=purge
1659          */
1660         public function purge() {
1661                 global $wgRequest, $wgOut;
1662
1663                 if ( $wgOut->getUser()->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1664                         //FIXME: shouldn't this be in doPurge()?
1665                         if ( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1666                                 $this->doPurge();
1667                                 $this->view();
1668                         }
1669                 } else {
1670                         $formParams = array(
1671                                 'method' => 'post',
1672                                 'action' =>  $wgRequest->getRequestURL(),
1673                         );
1674
1675                         $wgOut->addWikiMsg( 'confirm-purge-top' );
1676
1677                         $form  = Html::openElement( 'form', $formParams );
1678                         $form .= Xml::submitButton( wfMsg( 'confirm_purge_button' ) );
1679                         $form .= Html::closeElement( 'form' );
1680
1681                         $wgOut->addHTML( $form );
1682                         $wgOut->addWikiMsg( 'confirm-purge-bottom' );
1683
1684                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1685                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1686                 }
1687         }
1688
1689         /**
1690          * Perform the actions of a page purging
1691          */
1692         public function doPurge() {
1693                 global $wgUseSquid;
1694
1695                 // Invalidate the cache
1696                 $this->mTitle->invalidateCache();
1697                 $this->clear();
1698
1699                 if ( $wgUseSquid ) {
1700                         // Commit the transaction before the purge is sent
1701                         $dbw = wfGetDB( DB_MASTER );
1702                         $dbw->commit();
1703
1704                         // Send purge
1705                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1706                         $update->doUpdate();
1707                 }
1708
1709                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1710                         if ( $this->getID() == 0 ) {
1711                                 $text = false;
1712                         } else {
1713                                 $text = $this->getRawText();
1714                         }
1715
1716                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1717                 }
1718         }
1719
1720         /**
1721          * Insert a new empty page record for this article.
1722          * This *must* be followed up by creating a revision
1723          * and running $this->updateRevisionOn( ... );
1724          * or else the record will be left in a funky state.
1725          * Best if all done inside a transaction.
1726          *
1727          * @param $dbw Database
1728          * @return int The newly created page_id key, or false if the title already existed
1729          * @private
1730          */
1731         public function insertOn( $dbw ) {
1732                 wfProfileIn( __METHOD__ );
1733
1734                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1735                 $dbw->insert( 'page', array(
1736                         'page_id'           => $page_id,
1737                         'page_namespace'    => $this->mTitle->getNamespace(),
1738                         'page_title'        => $this->mTitle->getDBkey(),
1739                         'page_counter'      => 0,
1740                         'page_restrictions' => '',
1741                         'page_is_redirect'  => 0, # Will set this shortly...
1742                         'page_is_new'       => 1,
1743                         'page_random'       => wfRandom(),
1744                         'page_touched'      => $dbw->timestamp(),
1745                         'page_latest'       => 0, # Fill this in shortly...
1746                         'page_len'          => 0, # Fill this in shortly...
1747                 ), __METHOD__, 'IGNORE' );
1748
1749                 $affected = $dbw->affectedRows();
1750
1751                 if ( $affected ) {
1752                         $newid = $dbw->insertId();
1753                         $this->mTitle->resetArticleID( $newid );
1754                 }
1755                 wfProfileOut( __METHOD__ );
1756
1757                 return $affected ? $newid : false;
1758         }
1759
1760         /**
1761          * Update the page record to point to a newly saved revision.
1762          *
1763          * @param $dbw DatabaseBase: object
1764          * @param $revision Revision: For ID number, and text used to set
1765                                                 length and redirect status fields
1766          * @param $lastRevision Integer: if given, will not overwrite the page field
1767          *                      when different from the currently set value.
1768          *                      Giving 0 indicates the new page flag should be set
1769          *                      on.
1770          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1771          *                           removing rows in redirect table.
1772          * @param $setNewFlag Boolean: Set to true if a page flag should be set
1773          *                    Needed when $lastRevision has to be set to sth. !=0
1774          * @return bool true on success, false on failure
1775          * @private
1776          */
1777         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null, $setNewFlag = false ) {
1778                 wfProfileIn( __METHOD__ );
1779
1780                 $text = $revision->getText();
1781                 $rt = Title::newFromRedirectRecurse( $text );
1782
1783                 $conditions = array( 'page_id' => $this->getId() );
1784
1785                 if ( !is_null( $lastRevision ) ) {
1786                         # An extra check against threads stepping on each other
1787                         $conditions['page_latest'] = $lastRevision;
1788                 }
1789
1790                 if ( !$setNewFlag ) {
1791                         $setNewFlag = ( $lastRevision === 0 );
1792                 }
1793
1794                 $dbw->update( 'page',
1795                         array( /* SET */
1796                                 'page_latest'      => $revision->getId(),
1797                                 'page_touched'     => $dbw->timestamp(),
1798                                 'page_is_new'      => $setNewFlag,
1799                                 'page_is_redirect' => $rt !== null ? 1 : 0,
1800                                 'page_len'         => strlen( $text ),
1801                         ),
1802                         $conditions,
1803                         __METHOD__ );
1804
1805                 $result = $dbw->affectedRows() != 0;
1806                 if ( $result ) {
1807                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1808                 }
1809
1810                 wfProfileOut( __METHOD__ );
1811                 return $result;
1812         }
1813
1814         /**
1815          * Add row to the redirect table if this is a redirect, remove otherwise.
1816          *
1817          * @param $dbw Database
1818          * @param $redirectTitle Title object pointing to the redirect target,
1819          *                       or NULL if this is not a redirect
1820          * @param $lastRevIsRedirect If given, will optimize adding and
1821          *                           removing rows in redirect table.
1822          * @return bool true on success, false on failure
1823          * @private
1824          */
1825         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1826                 // Always update redirects (target link might have changed)
1827                 // Update/Insert if we don't know if the last revision was a redirect or not
1828                 // Delete if changing from redirect to non-redirect
1829                 $isRedirect = !is_null( $redirectTitle );
1830
1831                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
1832                         return true;
1833                 }
1834
1835                 wfProfileIn( __METHOD__ );
1836                 if ( $isRedirect ) {
1837                         $this->insertRedirectEntry( $redirectTitle );
1838                 } else {
1839                         // This is not a redirect, remove row from redirect table
1840                         $where = array( 'rd_from' => $this->getId() );
1841                         $dbw->delete( 'redirect', $where, __METHOD__ );
1842                 }
1843
1844                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1845                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1846                 }
1847                 wfProfileOut( __METHOD__ );
1848
1849                 return ( $dbw->affectedRows() != 0 );
1850         }
1851
1852         /**
1853          * If the given revision is newer than the currently set page_latest,
1854          * update the page record. Otherwise, do nothing.
1855          *
1856          * @param $dbw Database object
1857          * @param $revision Revision object
1858          * @return mixed
1859          */
1860         public function updateIfNewerOn( &$dbw, $revision ) {
1861                 wfProfileIn( __METHOD__ );
1862
1863                 $row = $dbw->selectRow(
1864                         array( 'revision', 'page' ),
1865                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1866                         array(
1867                                 'page_id' => $this->getId(),
1868                                 'page_latest=rev_id' ),
1869                         __METHOD__ );
1870
1871                 if ( $row ) {
1872                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1873                                 wfProfileOut( __METHOD__ );
1874                                 return false;
1875                         }
1876                         $prev = $row->rev_id;
1877                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1878                 } else {
1879                         # No or missing previous revision; mark the page as new
1880                         $prev = 0;
1881                         $lastRevIsRedirect = null;
1882                 }
1883
1884                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1885
1886                 wfProfileOut( __METHOD__ );
1887                 return $ret;
1888         }
1889
1890         /**
1891          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1892          * @param $text String: new text of the section
1893          * @param $summary String: new section's subject, only if $section is 'new'
1894          * @param $edittime String: revision timestamp or null to use the current revision
1895          * @return string Complete article text, or null if error
1896          */
1897         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
1898                 wfProfileIn( __METHOD__ );
1899
1900                 if ( strval( $section ) == '' ) {
1901                         // Whole-page edit; let the whole text through
1902                 } else {
1903                         if ( is_null( $edittime ) ) {
1904                                 $rev = Revision::newFromTitle( $this->mTitle );
1905                         } else {
1906                                 $dbw = wfGetDB( DB_MASTER );
1907                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1908                         }
1909
1910                         if ( !$rev ) {
1911                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1912                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1913                                 wfProfileOut( __METHOD__ );
1914                                 return null;
1915                         }
1916
1917                         $oldtext = $rev->getText();
1918
1919                         if ( $section == 'new' ) {
1920                                 # Inserting a new section
1921                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
1922                                 $text = strlen( trim( $oldtext ) ) > 0
1923                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1924                                                 : "{$subject}{$text}";
1925                         } else {
1926                                 # Replacing an existing section; roll out the big guns
1927                                 global $wgParser;
1928
1929                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1930                         }
1931                 }
1932
1933                 wfProfileOut( __METHOD__ );
1934                 return $text;
1935         }
1936
1937         /**
1938          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1939          * @param $flags Int
1940          * @return Int updated $flags
1941          */
1942         function checkFlags( $flags ) {
1943                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1944                         if ( $this->mTitle->getArticleID() ) {
1945                                 $flags |= EDIT_UPDATE;
1946                         } else {
1947                                 $flags |= EDIT_NEW;
1948                         }
1949                 }
1950
1951                 return $flags;
1952         }
1953
1954         /**
1955          * Article::doEdit()
1956          *
1957          * Change an existing article or create a new article. Updates RC and all necessary caches,
1958          * optionally via the deferred update array.
1959          *
1960          * $wgUser must be set before calling this function.
1961          *
1962          * @param $text String: new text
1963          * @param $summary String: edit summary
1964          * @param $flags Integer bitfield:
1965          *      EDIT_NEW
1966          *          Article is known or assumed to be non-existent, create a new one
1967          *      EDIT_UPDATE
1968          *          Article is known or assumed to be pre-existing, update it
1969          *      EDIT_MINOR
1970          *          Mark this edit minor, if the user is allowed to do so
1971          *      EDIT_SUPPRESS_RC
1972          *          Do not log the change in recentchanges
1973          *      EDIT_FORCE_BOT
1974          *          Mark the edit a "bot" edit regardless of user rights
1975          *      EDIT_DEFER_UPDATES
1976          *          Defer some of the updates until the end of index.php
1977          *      EDIT_AUTOSUMMARY
1978          *          Fill in blank summaries with generated text where possible
1979          *
1980          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1981          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1982          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1983          * edit-already-exists error will be returned. These two conditions are also possible with
1984          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1985          *
1986          * @param $baseRevId the revision ID this edit was based off, if any
1987          * @param $user User (optional), $wgUser will be used if not passed
1988          *
1989          * @return Status object. Possible errors:
1990          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1991          *     edit-gone-missing:       In update mode, but the article didn't exist
1992          *     edit-conflict:           In update mode, the article changed unexpectedly
1993          *     edit-no-change:          Warning that the text was the same as before
1994          *     edit-already-exists:     In creation mode, but the article already exists
1995          *
1996          *  Extensions may define additional errors.
1997          *
1998          *  $return->value will contain an associative array with members as follows:
1999          *     new:                     Boolean indicating if the function attempted to create a new article
2000          *     revision:                The revision object for the inserted revision, or null
2001          *
2002          *  Compatibility note: this function previously returned a boolean value indicating success/failure
2003          */
2004         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
2005                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
2006
2007                 # Low-level sanity check
2008                 if ( $this->mTitle->getText() === '' ) {
2009                         throw new MWException( 'Something is trying to edit an article with an empty title' );
2010                 }
2011
2012                 wfProfileIn( __METHOD__ );
2013
2014                 $user = is_null( $user ) ? $wgUser : $user;
2015                 $status = Status::newGood( array() );
2016
2017                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
2018                 $this->loadPageData();
2019
2020                 $flags = $this->checkFlags( $flags );
2021
2022                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
2023                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
2024                 {
2025                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
2026
2027                         if ( $status->isOK() ) {
2028                                 $status->fatal( 'edit-hook-aborted' );
2029                         }
2030
2031                         wfProfileOut( __METHOD__ );
2032                         return $status;
2033                 }
2034
2035                 # Silently ignore EDIT_MINOR if not allowed
2036                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
2037                 $bot = $flags & EDIT_FORCE_BOT;
2038
2039                 $oldtext = $this->getRawText(); // current revision
2040                 $oldsize = strlen( $oldtext );
2041
2042                 # Provide autosummaries if one is not provided and autosummaries are enabled.
2043                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
2044                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
2045                 }
2046
2047                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
2048                 $text = $editInfo->pst;
2049                 $newsize = strlen( $text );
2050
2051                 $dbw = wfGetDB( DB_MASTER );
2052                 $now = wfTimestampNow();
2053                 $this->mTimestamp = $now;
2054
2055                 if ( $flags & EDIT_UPDATE ) {
2056                         # Update article, but only if changed.
2057                         $status->value['new'] = false;
2058
2059                         # Make sure the revision is either completely inserted or not inserted at all
2060                         if ( !$wgDBtransactions ) {
2061                                 $userAbort = ignore_user_abort( true );
2062                         }
2063
2064                         $changed = ( strcmp( $text, $oldtext ) != 0 );
2065
2066                         if ( $changed ) {
2067                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
2068                                   - (int)$this->isCountable( $oldtext );
2069                                 $this->mTotalAdjustment = 0;
2070
2071                                 if ( !$this->mLatest ) {
2072                                         # Article gone missing
2073                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
2074                                         $status->fatal( 'edit-gone-missing' );
2075
2076                                         wfProfileOut( __METHOD__ );
2077                                         return $status;
2078                                 }
2079
2080                                 $revision = new Revision( array(
2081                                         'page'       => $this->getId(),
2082                                         'comment'    => $summary,
2083                                         'minor_edit' => $isminor,
2084                                         'text'       => $text,
2085                                         'parent_id'  => $this->mLatest,
2086                                         'user'       => $user->getId(),
2087                                         'user_text'  => $user->getName(),
2088                                         'timestamp'  => $now
2089                                 ) );
2090
2091                                 $dbw->begin();
2092                                 $revisionId = $revision->insertOn( $dbw );
2093
2094                                 # Update page
2095                                 #
2096                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
2097                                 # during the course of this function. This makes sure that EditPage can detect
2098                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
2099                                 # before this function is called. A previous function used a separate query, this
2100                                 # creates a window where concurrent edits can cause an ignored edit conflict.
2101                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
2102
2103                                 if ( !$ok ) {
2104                                         /* Belated edit conflict! Run away!! */
2105                                         $status->fatal( 'edit-conflict' );
2106
2107                                         # Delete the invalid revision if the DB is not transactional
2108                                         if ( !$wgDBtransactions ) {
2109                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
2110                                         }
2111
2112                                         $revisionId = 0;
2113                                         $dbw->rollback();
2114                                 } else {
2115                                         global $wgUseRCPatrol;
2116                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
2117                                         # Update recentchanges
2118                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2119                                                 # Mark as patrolled if the user can do so
2120                                                 $patrolled = $wgUseRCPatrol && !count(
2121                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2122                                                 # Add RC row to the DB
2123                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
2124                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
2125                                                         $revisionId, $patrolled
2126                                                 );
2127
2128                                                 # Log auto-patrolled edits
2129                                                 if ( $patrolled ) {
2130                                                         PatrolLog::record( $rc, true );
2131                                                 }
2132                                         }
2133                                         $user->incEditCount();
2134                                         $dbw->commit();
2135                                 }
2136                         } else {
2137                                 $status->warning( 'edit-no-change' );
2138                                 $revision = null;
2139                                 // Keep the same revision ID, but do some updates on it
2140                                 $revisionId = $this->getLatest();
2141                                 // Update page_touched, this is usually implicit in the page update
2142                                 // Other cache updates are done in onArticleEdit()
2143                                 $this->mTitle->invalidateCache();
2144                         }
2145
2146                         if ( !$wgDBtransactions ) {
2147                                 ignore_user_abort( $userAbort );
2148                         }
2149
2150                         // Now that ignore_user_abort is restored, we can respond to fatal errors
2151                         if ( !$status->isOK() ) {
2152                                 wfProfileOut( __METHOD__ );
2153                                 return $status;
2154                         }
2155
2156                         # Invalidate cache of this article and all pages using this article
2157                         # as a template. Partly deferred.
2158                         Article::onArticleEdit( $this->mTitle );
2159                         # Update links tables, site stats, etc.
2160                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed, $user );
2161                 } else {
2162                         # Create new article
2163                         $status->value['new'] = true;
2164
2165                         # Set statistics members
2166                         # We work out if it's countable after PST to avoid counter drift
2167                         # when articles are created with {{subst:}}
2168                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
2169                         $this->mTotalAdjustment = 1;
2170
2171                         $dbw->begin();
2172
2173                         # Add the page record; stake our claim on this title!
2174                         # This will return false if the article already exists
2175                         $newid = $this->insertOn( $dbw );
2176
2177                         if ( $newid === false ) {
2178                                 $dbw->rollback();
2179                                 $status->fatal( 'edit-already-exists' );
2180
2181                                 wfProfileOut( __METHOD__ );
2182                                 return $status;
2183                         }
2184
2185                         # Save the revision text...
2186                         $revision = new Revision( array(
2187                                 'page'       => $newid,
2188                                 'comment'    => $summary,
2189                                 'minor_edit' => $isminor,
2190                                 'text'       => $text,
2191                                 'user'       => $user->getId(),
2192                                 'user_text'  => $user->getName(),
2193                                 'timestamp'  => $now
2194                         ) );
2195                         $revisionId = $revision->insertOn( $dbw );
2196
2197                         $this->mTitle->resetArticleID( $newid );
2198                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached (FIXME?)
2199                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
2200
2201                         # Update the page record with revision data
2202                         $this->updateRevisionOn( $dbw, $revision, 0 );
2203
2204                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2205
2206                         # Update recentchanges
2207                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2208                                 global $wgUseRCPatrol, $wgUseNPPatrol;
2209
2210                                 # Mark as patrolled if the user can do so
2211                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2212                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2213                                 # Add RC row to the DB
2214                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2215                                         '', strlen( $text ), $revisionId, $patrolled );
2216
2217                                 # Log auto-patrolled edits
2218                                 if ( $patrolled ) {
2219                                         PatrolLog::record( $rc, true );
2220                                 }
2221                         }
2222                         $user->incEditCount();
2223                         $dbw->commit();
2224
2225                         # Update links, etc.
2226                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true, $user );
2227
2228                         # Clear caches
2229                         Article::onArticleCreate( $this->mTitle );
2230
2231                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
2232                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
2233                 }
2234
2235                 # Do updates right now unless deferral was requested
2236                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2237                         wfDoUpdates();
2238                 }
2239
2240                 // Return the new revision (or null) to the caller
2241                 $status->value['revision'] = $revision;
2242
2243                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
2244                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
2245
2246                 wfProfileOut( __METHOD__ );
2247                 return $status;
2248         }
2249
2250         /**
2251          * Output a redirect back to the article.
2252          * This is typically used after an edit.
2253          *
2254          * @param $noRedir Boolean: add redirect=no
2255          * @param $sectionAnchor String: section to redirect to, including "#"
2256          * @param $extraQuery String: extra query params
2257          */
2258         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
2259                 global $wgOut;
2260
2261                 if ( $noRedir ) {
2262                         $query = 'redirect=no';
2263                         if ( $extraQuery )
2264                                 $query .= "&$extraQuery";
2265                 } else {
2266                         $query = $extraQuery;
2267                 }
2268
2269                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
2270         }
2271
2272         /**
2273          * Mark this particular edit/page as patrolled
2274          */
2275         public function markpatrolled() {
2276                 global $wgOut, $wgRequest;
2277
2278                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2279
2280                 # If we haven't been given an rc_id value, we can't do anything
2281                 $rcid = (int) $wgRequest->getVal( 'rcid' );
2282
2283                 if ( !$wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'token' ), $rcid ) ) {
2284                         $wgOut->showErrorPage( 'sessionfailure-title', 'sessionfailure' );
2285                         return;
2286                 }
2287
2288                 $rc = RecentChange::newFromId( $rcid );
2289
2290                 if ( is_null( $rc ) ) {
2291                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
2292                         return;
2293                 }
2294
2295                 # It would be nice to see where the user had actually come from, but for now just guess
2296                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
2297                 $return = SpecialPage::getTitleFor( $returnto );
2298
2299                 $errors = $rc->doMarkPatrolled();
2300
2301                 if ( in_array( array( 'rcpatroldisabled' ), $errors ) ) {
2302                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
2303
2304                         return;
2305                 }
2306
2307                 if ( in_array( array( 'hookaborted' ), $errors ) ) {
2308                         // The hook itself has handled any output
2309                         return;
2310                 }
2311
2312                 if ( in_array( array( 'markedaspatrollederror-noautopatrol' ), $errors ) ) {
2313                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
2314                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
2315                         $wgOut->returnToMain( false, $return );
2316
2317                         return;
2318                 }
2319
2320                 if ( !empty( $errors ) ) {
2321                         $wgOut->showPermissionsErrorPage( $errors );
2322
2323                         return;
2324                 }
2325
2326                 # Inform the user
2327                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
2328                 $wgOut->addWikiMsg( 'markedaspatrolledtext', $rc->getTitle()->getPrefixedText() );
2329                 $wgOut->returnToMain( false, $return );
2330         }
2331
2332         /**
2333          * User-interface handler for the "watch" action
2334          */
2335         public function watch() {
2336                 global $wgOut;
2337
2338                 if ( $wgOut->getUser()->isAnon() ) {
2339                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2340                         return;
2341                 }
2342
2343                 if ( wfReadOnly() ) {
2344                         $wgOut->readOnlyPage();
2345                         return;
2346                 }
2347
2348                 if ( $this->doWatch() ) {
2349                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
2350                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2351                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
2352                 }
2353
2354                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2355         }
2356
2357         /**
2358          * Add this page to $wgUser's watchlist
2359          *
2360          * This is safe to be called multiple times
2361          *
2362          * @return bool true on successful watch operation
2363          */
2364         public function doWatch() {
2365                 global $wgUser;
2366
2367                 if ( $wgUser->isAnon() ) {
2368                         return false;
2369                 }
2370
2371                 if ( wfRunHooks( 'WatchArticle', array( &$wgUser, &$this ) ) ) {
2372                         $wgUser->addWatch( $this->mTitle );
2373                         return wfRunHooks( 'WatchArticleComplete', array( &$wgUser, &$this ) );
2374                 }
2375
2376                 return false;
2377         }
2378
2379         /**
2380          * User interface handler for the "unwatch" action.
2381          */
2382         public function unwatch() {
2383                 global $wgOut;
2384
2385                 if ( $wgOut->getUser()->isAnon() ) {
2386                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
2387                         return;
2388                 }
2389
2390                 if ( wfReadOnly() ) {
2391                         $wgOut->readOnlyPage();
2392                         return;
2393                 }
2394
2395                 if ( $this->doUnwatch() ) {
2396                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
2397                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
2398                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
2399                 }
2400
2401                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
2402         }
2403
2404         /**
2405          * Stop watching a page
2406          * @return bool true on successful unwatch
2407          */
2408         public function doUnwatch() {
2409                 global $wgUser;
2410
2411                 if ( $wgUser->isAnon() ) {
2412                         return false;
2413                 }
2414
2415                 if ( wfRunHooks( 'UnwatchArticle', array( &$wgUser, &$this ) ) ) {
2416                         $wgUser->removeWatch( $this->mTitle );
2417                         return wfRunHooks( 'UnwatchArticleComplete', array( &$wgUser, &$this ) );
2418                 }
2419
2420                 return false;
2421         }
2422
2423         /**
2424          * action=protect handler
2425          */
2426         public function protect() {
2427                 $form = new ProtectionForm( $this );
2428                 $form->execute();
2429         }
2430
2431         /**
2432          * action=unprotect handler (alias)
2433          */
2434         public function unprotect() {
2435                 $this->protect();
2436         }
2437
2438         /**
2439          * Update the article's restriction field, and leave a log entry.
2440          *
2441          * @param $limit Array: set of restriction keys
2442          * @param $reason String
2443          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2444          * @param $expiry Array: per restriction type expiration
2445          * @return bool true on success
2446          */
2447         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2448                 global $wgUser, $wgContLang;
2449
2450                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2451
2452                 $id = $this->mTitle->getArticleID();
2453
2454                 if ( $id <= 0 ) {
2455                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
2456                         return false;
2457                 }
2458
2459                 if ( wfReadOnly() ) {
2460                         wfDebug( "updateRestrictions failed: read-only\n" );
2461                         return false;
2462                 }
2463
2464                 if ( !$this->mTitle->userCan( 'protect' ) ) {
2465                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
2466                         return false;
2467                 }
2468
2469                 if ( !$cascade ) {
2470                         $cascade = false;
2471                 }
2472
2473                 // Take this opportunity to purge out expired restrictions
2474                 Title::purgeExpiredRestrictions();
2475
2476                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2477                 # we expect a single selection, but the schema allows otherwise.
2478                 $current = array();
2479                 $updated = Article::flattenRestrictions( $limit );
2480                 $changed = false;
2481
2482                 foreach ( $restrictionTypes as $action ) {
2483                         if ( isset( $expiry[$action] ) ) {
2484                                 # Get current restrictions on $action
2485                                 $aLimits = $this->mTitle->getRestrictions( $action );
2486                                 $current[$action] = implode( '', $aLimits );
2487                                 # Are any actual restrictions being dealt with here?
2488                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
2489
2490                                 # If something changed, we need to log it. Checking $aRChanged
2491                                 # assures that "unprotecting" a page that is not protected does
2492                                 # not log just because the expiry was "changed".
2493                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2494                                         $changed = true;
2495                                 }
2496                         }
2497                 }
2498
2499                 $current = Article::flattenRestrictions( $current );
2500
2501                 $changed = ( $changed || $current != $updated );
2502                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
2503                 $protect = ( $updated != '' );
2504
2505                 # If nothing's changed, do nothing
2506                 if ( $changed ) {
2507                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2508                                 $dbw = wfGetDB( DB_MASTER );
2509
2510                                 # Prepare a null revision to be added to the history
2511                                 $modified = $current != '' && $protect;
2512
2513                                 if ( $protect ) {
2514                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2515                                 } else {
2516                                         $comment_type = 'unprotectedarticle';
2517                                 }
2518
2519                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2520
2521                                 # Only restrictions with the 'protect' right can cascade...
2522                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2523                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2524
2525                                 # The schema allows multiple restrictions
2526                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2527                                         $cascade = false;
2528                                 }
2529
2530                                 $cascade_description = '';
2531
2532                                 if ( $cascade ) {
2533                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2534                                 }
2535
2536                                 if ( $reason ) {
2537                                         $comment .= ": $reason";
2538                                 }
2539
2540                                 $editComment = $comment;
2541                                 $encodedExpiry = array();
2542                                 $protect_description = '';
2543                                 foreach ( $limit as $action => $restrictions ) {
2544                                         if ( !isset( $expiry[$action] ) )
2545                                                 $expiry[$action] = $dbw->getInfinity();
2546
2547                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2548                                         if ( $restrictions != '' ) {
2549                                                 $protect_description .= "[$action=$restrictions] (";
2550                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2551                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2552                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2553                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2554                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2555                                                 } else {
2556                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2557                                                 }
2558
2559                                                 $protect_description .= ') ';
2560                                         }
2561                                 }
2562                                 $protect_description = trim( $protect_description );
2563
2564                                 if ( $protect_description && $protect ) {
2565                                         $editComment .= " ($protect_description)";
2566                                 }
2567
2568                                 if ( $cascade ) {
2569                                         $editComment .= "$cascade_description";
2570                                 }
2571
2572                                 # Update restrictions table
2573                                 foreach ( $limit as $action => $restrictions ) {
2574                                         if ( $restrictions != '' ) {
2575                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2576                                                         array( 'pr_page' => $id,
2577                                                                 'pr_type' => $action,
2578                                                                 'pr_level' => $restrictions,
2579                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2580                                                                 'pr_expiry' => $encodedExpiry[$action]
2581                                                         ),
2582                                                         __METHOD__
2583                                                 );
2584                                         } else {
2585                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2586                                                         'pr_type' => $action ), __METHOD__ );
2587                                         }
2588                                 }
2589
2590                                 # Insert a null revision
2591                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2592                                 $nullRevId = $nullRevision->insertOn( $dbw );
2593
2594                                 $latest = $this->getLatest();
2595                                 # Update page record
2596                                 $dbw->update( 'page',
2597                                         array( /* SET */
2598                                                 'page_touched' => $dbw->timestamp(),
2599                                                 'page_restrictions' => '',
2600                                                 'page_latest' => $nullRevId
2601                                         ), array( /* WHERE */
2602                                                 'page_id' => $id
2603                                         ), 'Article::protect'
2604                                 );
2605
2606                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $wgUser ) );
2607                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2608
2609                                 # Update the protection log
2610                                 $log = new LogPage( 'protect' );
2611                                 if ( $protect ) {
2612                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
2613                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
2614                                 } else {
2615                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2616                                 }
2617                         } # End hook
2618                 } # End "changed" check
2619
2620                 return true;
2621         }
2622
2623         /**
2624          * Take an array of page restrictions and flatten it to a string
2625          * suitable for insertion into the page_restrictions field.
2626          * @param $limit Array
2627          * @return String
2628          */
2629         protected static function flattenRestrictions( $limit ) {
2630                 if ( !is_array( $limit ) ) {
2631                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2632                 }
2633
2634                 $bits = array();
2635                 ksort( $limit );
2636
2637                 foreach ( $limit as $action => $restrictions ) {
2638                         if ( $restrictions != '' ) {
2639                                 $bits[] = "$action=$restrictions";
2640                         }
2641                 }
2642
2643                 return implode( ':', $bits );
2644         }
2645
2646         /**
2647          * Auto-generates a deletion reason
2648          *
2649          * @param &$hasHistory Boolean: whether the page has a history
2650          * @return mixed String containing deletion reason or empty string, or boolean false
2651          *    if no revision occurred
2652          */
2653         public function generateReason( &$hasHistory ) {
2654                 global $wgContLang;
2655
2656                 $dbw = wfGetDB( DB_MASTER );
2657                 // Get the last revision
2658                 $rev = Revision::newFromTitle( $this->mTitle );
2659
2660                 if ( is_null( $rev ) ) {
2661                         return false;
2662                 }
2663
2664                 // Get the article's contents
2665                 $contents = $rev->getText();
2666                 $blank = false;
2667
2668                 // If the page is blank, use the text from the previous revision,
2669                 // which can only be blank if there's a move/import/protect dummy revision involved
2670                 if ( $contents == '' ) {
2671                         $prev = $rev->getPrevious();
2672
2673                         if ( $prev )    {
2674                                 $contents = $prev->getText();
2675                                 $blank = true;
2676                         }
2677                 }
2678
2679                 // Find out if there was only one contributor
2680                 // Only scan the last 20 revisions
2681                 $res = $dbw->select( 'revision', 'rev_user_text',
2682                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2683                         __METHOD__,
2684                         array( 'LIMIT' => 20 )
2685                 );
2686
2687                 if ( $res === false ) {
2688                         // This page has no revisions, which is very weird
2689                         return false;
2690                 }
2691
2692                 $hasHistory = ( $res->numRows() > 1 );
2693                 $row = $dbw->fetchObject( $res );
2694
2695                 if ( $row ) { // $row is false if the only contributor is hidden
2696                         $onlyAuthor = $row->rev_user_text;
2697                         // Try to find a second contributor
2698                         foreach ( $res as $row ) {
2699                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2700                                         $onlyAuthor = false;
2701                                         break;
2702                                 }
2703                         }
2704                 } else {
2705                         $onlyAuthor = false;
2706                 }
2707
2708                 // Generate the summary with a '$1' placeholder
2709                 if ( $blank ) {
2710                         // The current revision is blank and the one before is also
2711                         // blank. It's just not our lucky day
2712                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2713                 } else {
2714                         if ( $onlyAuthor ) {
2715                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2716                         } else {
2717                                 $reason = wfMsgForContent( 'excontent', '$1' );
2718                         }
2719                 }
2720
2721                 if ( $reason == '-' ) {
2722                         // Allow these UI messages to be blanked out cleanly
2723                         return '';
2724                 }
2725
2726                 // Replace newlines with spaces to prevent uglyness
2727                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2728                 // Calculate the maximum amount of chars to get
2729                 // Max content length = max comment length - length of the comment (excl. $1)
2730                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2731                 $contents = $wgContLang->truncate( $contents, $maxLength );
2732                 // Remove possible unfinished links
2733                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2734                 // Now replace the '$1' placeholder
2735                 $reason = str_replace( '$1', $contents, $reason );
2736
2737                 return $reason;
2738         }
2739
2740
2741         /*
2742          * UI entry point for page deletion
2743          */
2744         public function delete() {
2745                 global $wgOut, $wgRequest;
2746
2747                 $confirm = $wgRequest->wasPosted() &&
2748                                 $wgOut->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2749
2750                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2751                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2752
2753                 $reason = $this->DeleteReasonList;
2754
2755                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
2756                         // Entry from drop down menu + additional comment
2757                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2758                 } elseif ( $reason == 'other' ) {
2759                         $reason = $this->DeleteReason;
2760                 }
2761
2762                 # Flag to hide all contents of the archived revisions
2763                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgOut->getUser()->isAllowed( 'suppressrevision' );
2764
2765                 # This code desperately needs to be totally rewritten
2766
2767                 # Read-only check...
2768                 if ( wfReadOnly() ) {
2769                         $wgOut->readOnlyPage();
2770
2771                         return;
2772                 }
2773
2774                 # Check permissions
2775                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgOut->getUser() );
2776
2777                 if ( count( $permission_errors ) > 0 ) {
2778                         $wgOut->showPermissionsErrorPage( $permission_errors );
2779
2780                         return;
2781                 }
2782
2783                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2784
2785                 # Better double-check that it hasn't been deleted yet!
2786                 $dbw = wfGetDB( DB_MASTER );
2787                 $conds = $this->mTitle->pageCond();
2788                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2789                 if ( $latest === false ) {
2790                         $wgOut->showFatalError(
2791                                 Html::rawElement(
2792                                         'div',
2793                                         array( 'class' => 'error mw-error-cannotdelete' ),
2794                                         wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
2795                                 )
2796                         );
2797                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2798                         LogEventsList::showLogExtract(
2799                                 $wgOut,
2800                                 'delete',
2801                                 $this->mTitle->getPrefixedText()
2802                         );
2803
2804                         return;
2805                 }
2806
2807                 # Hack for big sites
2808                 $bigHistory = $this->isBigDeletion();
2809                 if ( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2810                         global $wgLang, $wgDeleteRevisionsLimit;
2811
2812                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2813                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2814
2815                         return;
2816                 }
2817
2818                 if ( $confirm ) {
2819                         $this->doDelete( $reason, $suppress );
2820
2821                         if ( $wgRequest->getCheck( 'wpWatch' ) && $wgOut->getUser()->isLoggedIn() ) {
2822                                 $this->doWatch();
2823                         } elseif ( $this->mTitle->userIsWatching() ) {
2824                                 $this->doUnwatch();
2825                         }
2826
2827                         return;
2828                 }
2829
2830                 // Generate deletion reason
2831                 $hasHistory = false;
2832                 if ( !$reason ) {
2833                         $reason = $this->generateReason( $hasHistory );
2834                 }
2835
2836                 // If the page has a history, insert a warning
2837                 if ( $hasHistory && !$confirm ) {
2838                         global $wgLang;
2839
2840                         $skin = $wgOut->getSkin();
2841                         $revisions = $this->estimateRevisionCount();
2842                         //FIXME: lego
2843                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
2844                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
2845                                 wfMsgHtml( 'word-separator' ) . $skin->link( $this->mTitle,
2846                                         wfMsgHtml( 'history' ),
2847                                         array( 'rel' => 'archives' ),
2848                                         array( 'action' => 'history' ) ) .
2849                                 '</strong>'
2850                         );
2851
2852                         if ( $bigHistory ) {
2853                                 global $wgDeleteRevisionsLimit;
2854                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
2855                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2856                         }
2857                 }
2858
2859                 return $this->confirmDelete( $reason );
2860         }
2861
2862         /**
2863          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2864          */
2865         public function isBigDeletion() {
2866                 global $wgDeleteRevisionsLimit;
2867
2868                 if ( $wgDeleteRevisionsLimit ) {
2869                         $revCount = $this->estimateRevisionCount();
2870
2871                         return $revCount > $wgDeleteRevisionsLimit;
2872                 }
2873
2874                 return false;
2875         }
2876
2877         /**
2878          * @return int approximate revision count
2879          */
2880         public function estimateRevisionCount() {
2881                 $dbr = wfGetDB( DB_SLAVE );
2882
2883                 // For an exact count...
2884                 // return $dbr->selectField( 'revision', 'COUNT(*)',
2885                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2886                 return $dbr->estimateRowCount( 'revision', '*',
2887                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2888         }
2889
2890         /**
2891          * Get the last N authors
2892          * @param $num Integer: number of revisions to get
2893          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2894          * @return array Array of authors, duplicates not removed
2895          */
2896         public function getLastNAuthors( $num, $revLatest = 0 ) {
2897                 wfProfileIn( __METHOD__ );
2898                 // First try the slave
2899                 // If that doesn't have the latest revision, try the master
2900                 $continue = 2;
2901                 $db = wfGetDB( DB_SLAVE );
2902
2903                 do {
2904                         $res = $db->select( array( 'page', 'revision' ),
2905                                 array( 'rev_id', 'rev_user_text' ),
2906                                 array(
2907                                         'page_namespace' => $this->mTitle->getNamespace(),
2908                                         'page_title' => $this->mTitle->getDBkey(),
2909                                         'rev_page = page_id'
2910                                 ), __METHOD__, $this->getSelectOptions( array(
2911                                         'ORDER BY' => 'rev_timestamp DESC',
2912                                         'LIMIT' => $num
2913                                 ) )
2914                         );
2915
2916                         if ( !$res ) {
2917                                 wfProfileOut( __METHOD__ );
2918                                 return array();
2919                         }
2920
2921                         $row = $db->fetchObject( $res );
2922
2923                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2924                                 $db = wfGetDB( DB_MASTER );
2925                                 $continue--;
2926                         } else {
2927                                 $continue = 0;
2928                         }
2929                 } while ( $continue );
2930
2931                 $authors = array( $row->rev_user_text );
2932
2933                 foreach ( $res as $row ) {
2934                         $authors[] = $row->rev_user_text;
2935                 }
2936
2937                 wfProfileOut( __METHOD__ );
2938                 return $authors;
2939         }
2940
2941         /**
2942          * Output deletion confirmation dialog
2943          * FIXME: Move to another file?
2944          * @param $reason String: prefilled reason
2945          */
2946         public function confirmDelete( $reason ) {
2947                 global $wgOut;
2948
2949                 wfDebug( "Article::confirmDelete\n" );
2950
2951                 $deleteBackLink = $wgOut->getSkin()->linkKnown( $this->mTitle );
2952                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
2953                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2954                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2955
2956                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
2957
2958                 if ( $wgOut->getUser()->isAllowed( 'suppressrevision' ) ) {
2959                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
2960                                         <td></td>
2961                                         <td class='mw-input'><strong>" .
2962                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2963                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2964                                         "</strong></td>
2965                                 </tr>";
2966                 } else {
2967                         $suppress = '';
2968                 }
2969                 $checkWatch = $wgOut->getUser()->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2970
2971                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2972                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2973                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2974                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2975                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2976                         "<tr id=\"wpDeleteReasonListRow\">
2977                                 <td class='mw-label'>" .
2978                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2979                                 "</td>
2980                                 <td class='mw-input'>" .
2981                                         Xml::listDropDown( 'wpDeleteReasonList',
2982                                                 wfMsgForContent( 'deletereason-dropdown' ),
2983                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2984                                 "</td>
2985                         </tr>
2986                         <tr id=\"wpDeleteReasonRow\">
2987                                 <td class='mw-label'>" .
2988                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2989                                 "</td>
2990                                 <td class='mw-input'>" .
2991                                 Html::input( 'wpReason', $reason, 'text', array(
2992                                         'size' => '60',
2993                                         'maxlength' => '255',
2994                                         'tabindex' => '2',
2995                                         'id' => 'wpReason',
2996                                         'autofocus'
2997                                 ) ) .
2998                                 "</td>
2999                         </tr>";
3000
3001                 # Disallow watching if user is not logged in
3002                 if ( $wgOut->getUser()->isLoggedIn() ) {
3003                         $form .= "
3004                         <tr>
3005                                 <td></td>
3006                                 <td class='mw-input'>" .
3007                                         Xml::checkLabel( wfMsg( 'watchthis' ),
3008                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
3009                                 "</td>
3010                         </tr>";
3011                 }
3012
3013                 $form .= "
3014                         $suppress
3015                         <tr>
3016                                 <td></td>
3017                                 <td class='mw-submit'>" .
3018                                         Xml::submitButton( wfMsg( 'deletepage' ),
3019                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
3020                                 "</td>
3021                         </tr>" .
3022                         Xml::closeElement( 'table' ) .
3023                         Xml::closeElement( 'fieldset' ) .
3024                         Html::hidden( 'wpEditToken', $wgOut->getUser()->editToken() ) .
3025                         Xml::closeElement( 'form' );
3026
3027                         if ( $wgOut->getUser()->isAllowed( 'editinterface' ) ) {
3028                                 $skin = $wgOut->getSkin();
3029                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
3030                                 $link = $skin->link(
3031                                         $title,
3032                                         wfMsgHtml( 'delete-edit-reasonlist' ),
3033                                         array(),
3034                                         array( 'action' => 'edit' )
3035                                 );
3036                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
3037                         }
3038
3039                 $wgOut->addHTML( $form );
3040                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3041                 LogEventsList::showLogExtract( $wgOut, 'delete',
3042                         $this->mTitle->getPrefixedText()
3043                 );
3044         }
3045
3046         /**
3047          * Perform a deletion and output success or failure messages
3048          */
3049         public function doDelete( $reason, $suppress = false ) {
3050                 global $wgOut;
3051
3052                 $id = $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3053
3054                 $error = '';
3055                 if ( $this->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
3056                         $deleted = $this->mTitle->getPrefixedText();
3057
3058                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
3059                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
3060
3061                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
3062
3063                         $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
3064                         $wgOut->returnToMain( false );
3065                 } else {
3066                         if ( $error == '' ) {
3067                                 $wgOut->showFatalError(
3068                                         Html::rawElement(
3069                                                 'div',
3070                                                 array( 'class' => 'error mw-error-cannotdelete' ),
3071                                                 wfMsgExt( 'cannotdelete', array( 'parse' ), $this->mTitle->getPrefixedText() )
3072                                         )
3073                                 );
3074
3075                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
3076
3077                                 LogEventsList::showLogExtract(
3078                                         $wgOut,
3079                                         'delete',
3080                                         $this->mTitle->getPrefixedText()
3081                                 );
3082                         } else {
3083                                 $wgOut->showFatalError( $error );
3084                         }
3085                 }
3086         }
3087
3088         /**
3089          * Back-end article deletion
3090          * Deletes the article with database consistency, writes logs, purges caches
3091          *
3092          * @param $reason string delete reason for deletion log
3093          * @param suppress bitfield
3094          *      Revision::DELETED_TEXT
3095          *      Revision::DELETED_COMMENT
3096          *      Revision::DELETED_USER
3097          *      Revision::DELETED_RESTRICTED
3098          * @param $id int article ID
3099          * @param $commit boolean defaults to true, triggers transaction end
3100          * @return boolean true if successful
3101          */
3102         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
3103                 global $wgDeferredUpdateList, $wgUseTrackbacks;
3104                 global $wgUser;
3105
3106                 wfDebug( __METHOD__ . "\n" );
3107
3108                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$wgUser, &$reason, &$error ) ) ) {
3109                         return false;
3110                 }
3111                 $dbw = wfGetDB( DB_MASTER );
3112                 $t = $this->mTitle->getDBkey();
3113                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
3114
3115                 if ( $t === '' || $id == 0 ) {
3116                         return false;
3117                 }
3118
3119                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable( $this->getRawText() ), -1 );
3120                 array_push( $wgDeferredUpdateList, $u );
3121
3122                 // Bitfields to further suppress the content
3123                 if ( $suppress ) {
3124                         $bitfield = 0;
3125                         // This should be 15...
3126                         $bitfield |= Revision::DELETED_TEXT;
3127                         $bitfield |= Revision::DELETED_COMMENT;
3128                         $bitfield |= Revision::DELETED_USER;
3129                         $bitfield |= Revision::DELETED_RESTRICTED;
3130                 } else {
3131                         $bitfield = 'rev_deleted';
3132                 }
3133
3134                 $dbw->begin();
3135                 // For now, shunt the revision data into the archive table.
3136                 // Text is *not* removed from the text table; bulk storage
3137                 // is left intact to avoid breaking block-compression or
3138                 // immutable storage schemes.
3139                 //
3140                 // For backwards compatibility, note that some older archive
3141                 // table entries will have ar_text and ar_flags fields still.
3142                 //
3143                 // In the future, we may keep revisions and mark them with
3144                 // the rev_deleted field, which is reserved for this purpose.
3145                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
3146                         array(
3147                                 'ar_namespace'  => 'page_namespace',
3148                                 'ar_title'      => 'page_title',
3149                                 'ar_comment'    => 'rev_comment',
3150                                 'ar_user'       => 'rev_user',
3151                                 'ar_user_text'  => 'rev_user_text',
3152                                 'ar_timestamp'  => 'rev_timestamp',
3153                                 'ar_minor_edit' => 'rev_minor_edit',
3154                                 'ar_rev_id'     => 'rev_id',
3155                                 'ar_text_id'    => 'rev_text_id',
3156                                 'ar_text'       => '\'\'', // Be explicit to appease
3157                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
3158                                 'ar_len'        => 'rev_len',
3159                                 'ar_page_id'    => 'page_id',
3160                                 'ar_deleted'    => $bitfield
3161                         ), array(
3162                                 'page_id' => $id,
3163                                 'page_id = rev_page'
3164                         ), __METHOD__
3165                 );
3166
3167                 # Delete restrictions for it
3168                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
3169
3170                 # Now that it's safely backed up, delete it
3171                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
3172                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
3173
3174                 if ( !$ok ) {
3175                         $dbw->rollback();
3176                         return false;
3177                 }
3178
3179                 # Fix category table counts
3180                 $cats = array();
3181                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
3182
3183                 foreach ( $res as $row ) {
3184                         $cats [] = $row->cl_to;
3185                 }
3186
3187                 $this->updateCategoryCounts( array(), $cats );
3188
3189                 # If using cascading deletes, we can skip some explicit deletes
3190                 if ( !$dbw->cascadingDeletes() ) {
3191                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
3192
3193                         if ( $wgUseTrackbacks )
3194                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
3195
3196                         # Delete outgoing links
3197                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
3198                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
3199                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
3200                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
3201                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
3202                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
3203                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
3204                 }
3205
3206                 # If using cleanup triggers, we can skip some manual deletes
3207                 if ( !$dbw->cleanupTriggers() ) {
3208                         # Clean up recentchanges entries...
3209                         $dbw->delete( 'recentchanges',
3210                                 array( 'rc_type != ' . RC_LOG,
3211                                         'rc_namespace' => $this->mTitle->getNamespace(),
3212                                         'rc_title' => $this->mTitle->getDBkey() ),
3213                                 __METHOD__ );
3214                         $dbw->delete( 'recentchanges',
3215                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
3216                                 __METHOD__ );
3217                 }
3218
3219                 # Clear caches
3220                 Article::onArticleDelete( $this->mTitle );
3221
3222                 # Clear the cached article id so the interface doesn't act like we exist
3223                 $this->mTitle->resetArticleID( 0 );
3224
3225                 # Log the deletion, if the page was suppressed, log it at Oversight instead
3226                 $logtype = $suppress ? 'suppress' : 'delete';
3227                 $log = new LogPage( $logtype );
3228
3229                 # Make sure logging got through
3230                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
3231
3232                 if ( $commit ) {
3233                         $dbw->commit();
3234                 }
3235
3236                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$wgUser, $reason, $id ) );
3237                 return true;
3238         }
3239
3240         /**
3241          * Roll back the most recent consecutive set of edits to a page
3242          * from the same user; fails if there are no eligible edits to
3243          * roll back to, e.g. user is the sole contributor. This function
3244          * performs permissions checks on $wgUser, then calls commitRollback()
3245          * to do the dirty work
3246          *
3247          * @param $fromP String: Name of the user whose edits to rollback.
3248          * @param $summary String: Custom summary. Set to default summary if empty.
3249          * @param $token String: Rollback token.
3250          * @param $bot Boolean: If true, mark all reverted edits as bot.
3251          *
3252          * @param $resultDetails Array: contains result-specific array of additional values
3253          *    'alreadyrolled' : 'current' (rev)
3254          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3255          *
3256          * @return array of errors, each error formatted as
3257          *   array(messagekey, param1, param2, ...).
3258          * On success, the array is empty.  This array can also be passed to
3259          * OutputPage::showPermissionsErrorPage().
3260          */
3261         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
3262                 global $wgUser;
3263
3264                 $resultDetails = null;
3265
3266                 # Check permissions
3267                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
3268                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
3269                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3270
3271                 if ( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
3272                         $errors[] = array( 'sessionfailure' );
3273                 }
3274
3275                 if ( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
3276                         $errors[] = array( 'actionthrottledtext' );
3277                 }
3278
3279                 # If there were errors, bail out now
3280                 if ( !empty( $errors ) ) {
3281                         return $errors;
3282                 }
3283
3284                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails );
3285         }
3286
3287         /**
3288          * Backend implementation of doRollback(), please refer there for parameter
3289          * and return value documentation
3290          *
3291          * NOTE: This function does NOT check ANY permissions, it just commits the
3292          * rollback to the DB Therefore, you should only call this function direct-
3293          * ly if you want to use custom permissions checks. If you don't, use
3294          * doRollback() instead.
3295          */
3296         public function commitRollback( $fromP, $summary, $bot, &$resultDetails ) {
3297                 global $wgUseRCPatrol, $wgUser, $wgLang;
3298
3299                 $dbw = wfGetDB( DB_MASTER );
3300
3301                 if ( wfReadOnly() ) {
3302                         return array( array( 'readonlytext' ) );
3303                 }
3304
3305                 # Get the last editor
3306                 $current = Revision::newFromTitle( $this->mTitle );
3307                 if ( is_null( $current ) ) {
3308                         # Something wrong... no page?
3309                         return array( array( 'notanarticle' ) );
3310                 }
3311
3312                 $from = str_replace( '_', ' ', $fromP );
3313                 # User name given should match up with the top revision.
3314                 # If the user was deleted then $from should be empty.
3315                 if ( $from != $current->getUserText() ) {
3316                         $resultDetails = array( 'current' => $current );
3317                         return array( array( 'alreadyrolled',
3318                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3319                                 htmlspecialchars( $fromP ),
3320                                 htmlspecialchars( $current->getUserText() )
3321                         ) );
3322                 }
3323
3324                 # Get the last edit not by this guy...
3325                 # Note: these may not be public values
3326                 $user = intval( $current->getRawUser() );
3327                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3328                 $s = $dbw->selectRow( 'revision',
3329                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3330                         array( 'rev_page' => $current->getPage(),
3331                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3332                         ), __METHOD__,
3333                         array( 'USE INDEX' => 'page_timestamp',
3334                                 'ORDER BY' => 'rev_timestamp DESC' )
3335                         );
3336                 if ( $s === false ) {
3337                         # No one else ever edited this page
3338                         return array( array( 'cantrollback' ) );
3339                 } else if ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
3340                         # Only admins can see this text
3341                         return array( array( 'notvisiblerev' ) );
3342                 }
3343
3344                 $set = array();
3345                 if ( $bot && $wgUser->isAllowed( 'markbotedits' ) ) {
3346                         # Mark all reverted edits as bot
3347                         $set['rc_bot'] = 1;
3348                 }
3349
3350                 if ( $wgUseRCPatrol ) {
3351                         # Mark all reverted edits as patrolled
3352                         $set['rc_patrolled'] = 1;
3353                 }
3354
3355                 if ( count( $set ) ) {
3356                         $dbw->update( 'recentchanges', $set,
3357                                 array( /* WHERE */
3358                                         'rc_cur_id' => $current->getPage(),
3359                                         'rc_user_text' => $current->getUserText(),
3360                                         "rc_timestamp > '{$s->rev_timestamp}'",
3361                                 ), __METHOD__
3362                         );
3363                 }
3364
3365                 # Generate the edit summary if necessary
3366                 $target = Revision::newFromId( $s->rev_id );
3367                 if ( empty( $summary ) ) {
3368                         if ( $from == '' ) { // no public user name
3369                                 $summary = wfMsgForContent( 'revertpage-nouser' );
3370                         } else {
3371                                 $summary = wfMsgForContent( 'revertpage' );
3372                         }
3373                 }
3374
3375                 # Allow the custom summary to use the same args as the default message
3376                 $args = array(
3377                         $target->getUserText(), $from, $s->rev_id,
3378                         $wgLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ), true ),
3379                         $current->getId(), $wgLang->timeanddate( $current->getTimestamp() )
3380                 );
3381                 $summary = wfMsgReplaceArgs( $summary, $args );
3382
3383                 # Save
3384                 $flags = EDIT_UPDATE;
3385
3386                 if ( $wgUser->isAllowed( 'minoredit' ) ) {
3387                         $flags |= EDIT_MINOR;
3388                 }
3389
3390                 if ( $bot && ( $wgUser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3391                         $flags |= EDIT_FORCE_BOT;
3392                 }
3393
3394                 # Actually store the edit
3395                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
3396                 if ( !empty( $status->value['revision'] ) ) {
3397                         $revId = $status->value['revision']->getId();
3398                 } else {
3399                         $revId = false;
3400                 }
3401
3402                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
3403
3404                 $resultDetails = array(
3405                         'summary' => $summary,
3406                         'current' => $current,
3407                         'target'  => $target,
3408                         'newid'   => $revId
3409                 );
3410
3411                 return array();
3412         }
3413
3414         /**
3415          * User interface for rollback operations
3416          */
3417         public function rollback() {
3418                 global $wgUser, $wgOut, $wgRequest;
3419
3420                 $details = null;
3421
3422                 $result = $this->doRollback(
3423                         $wgRequest->getVal( 'from' ),
3424                         $wgRequest->getText( 'summary' ),
3425                         $wgRequest->getVal( 'token' ),
3426                         $wgRequest->getBool( 'bot' ),
3427                         $details
3428                 );
3429
3430                 if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
3431                         $wgOut->rateLimited();
3432                         return;
3433                 }
3434
3435                 if ( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
3436                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
3437                         $errArray = $result[0];
3438                         $errMsg = array_shift( $errArray );
3439                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
3440
3441                         if ( isset( $details['current'] ) ) {
3442                                 $current = $details['current'];
3443
3444                                 if ( $current->getComment() != '' ) {
3445                                         $wgOut->addWikiMsgArray( 'editcomment', array(
3446                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
3447                                 }
3448                         }
3449
3450                         return;
3451                 }
3452
3453                 # Display permissions errors before read-only message -- there's no
3454                 # point in misleading the user into thinking the inability to rollback
3455                 # is only temporary.
3456                 if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
3457                         # array_diff is completely broken for arrays of arrays, sigh.
3458                         # Remove any 'readonlytext' error manually.
3459                         $out = array();
3460                         foreach ( $result as $error ) {
3461                                 if ( $error != array( 'readonlytext' ) ) {
3462                                         $out [] = $error;
3463                                 }
3464                         }
3465                         $wgOut->showPermissionsErrorPage( $out );
3466
3467                         return;
3468                 }
3469
3470                 if ( $result == array( array( 'readonlytext' ) ) ) {
3471                         $wgOut->readOnlyPage();
3472
3473                         return;
3474                 }
3475
3476                 $current = $details['current'];
3477                 $target = $details['target'];
3478                 $newId = $details['newid'];
3479                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
3480                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
3481
3482                 if ( $current->getUserText() === '' ) {
3483                         $old = wfMsg( 'rev-deleted-user' );
3484                 } else {
3485                         $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
3486                                 . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
3487                 }
3488
3489                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
3490                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
3491                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
3492                 $wgOut->returnToMain( false, $this->mTitle );
3493
3494                 if ( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
3495                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
3496                         $de->showDiff( '', '' );
3497                 }
3498         }
3499
3500         /**
3501          * Do standard deferred updates after page view
3502          */
3503         public function viewUpdates() {
3504                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
3505                 if ( wfReadOnly() ) {
3506                         return;
3507                 }
3508
3509                 # Don't update page view counters on views from bot users (bug 14044)
3510                 if ( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) && $this->getID() ) {
3511                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
3512                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
3513                 }
3514
3515                 # Update newtalk / watchlist notification status
3516                 $wgUser->clearNotification( $this->mTitle );
3517         }
3518
3519         /**
3520          * Prepare text which is about to be saved.
3521          * Returns a stdclass with source, pst and output members
3522          */
3523         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
3524                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid ) {
3525                         // Already prepared
3526                         return $this->mPreparedEdit;
3527                 }
3528
3529                 global $wgParser;
3530
3531                 if( $user === null ) {
3532                         global $wgUser;
3533                         $user = $wgUser;
3534                 }
3535                 $popts = ParserOptions::newFromUser( $user );
3536                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
3537
3538                 $edit = (object)array();
3539                 $edit->revid = $revid;
3540                 $edit->newText = $text;
3541                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
3542                 $edit->popts = $this->getParserOptions();
3543                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
3544                 $edit->oldText = $this->getRawText();
3545
3546                 $this->mPreparedEdit = $edit;
3547
3548                 return $edit;
3549         }
3550
3551         /**
3552          * Do standard deferred updates after page edit.
3553          * Update links tables, site stats, search index and message cache.
3554          * Purges pages that include this page if the text was changed here.
3555          * Every 100th edit, prune the recent changes table.
3556          *
3557          * @private
3558          * @param $text String: New text of the article
3559          * @param $summary String: Edit summary
3560          * @param $minoredit Boolean: Minor edit
3561          * @param $timestamp_of_pagechange String timestamp associated with the page change
3562          * @param $newid Integer: rev_id value of the new revision
3563          * @param $changed Boolean: Whether or not the content actually changed
3564          * @param $user User object: User doing the edit
3565          */
3566         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true, User $user = null ) {
3567                 global $wgDeferredUpdateList, $wgUser, $wgEnableParserCache;
3568
3569                 wfProfileIn( __METHOD__ );
3570
3571                 # Parse the text
3572                 # Be careful not to double-PST: $text is usually already PST-ed once
3573                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
3574                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
3575                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
3576                 } else {
3577                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
3578                         $editInfo = $this->mPreparedEdit;
3579                 }
3580
3581                 # Save it to the parser cache
3582                 if ( $wgEnableParserCache ) {
3583                         $parserCache = ParserCache::singleton();
3584                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
3585                 }
3586
3587                 # Update the links tables
3588                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
3589                 $u->doUpdate();
3590
3591                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
3592
3593                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
3594                         if ( 0 == mt_rand( 0, 99 ) ) {
3595                                 // Flush old entries from the `recentchanges` table; we do this on
3596                                 // random requests so as to avoid an increase in writes for no good reason
3597                                 global $wgRCMaxAge;
3598
3599                                 $dbw = wfGetDB( DB_MASTER );
3600                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
3601                                 $recentchanges = $dbw->tableName( 'recentchanges' );
3602                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
3603
3604                                 $dbw->query( $sql );
3605                         }
3606                 }
3607
3608                 $id = $this->getID();
3609                 $title = $this->mTitle->getPrefixedDBkey();
3610                 $shortTitle = $this->mTitle->getDBkey();
3611
3612                 if ( 0 == $id ) {
3613                         wfProfileOut( __METHOD__ );
3614                         return;
3615                 }
3616
3617                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
3618                 array_push( $wgDeferredUpdateList, $u );
3619                 $u = new SearchUpdate( $id, $title, $text );
3620                 array_push( $wgDeferredUpdateList, $u );
3621
3622                 # If this is another user's talk page, update newtalk
3623                 # Don't do this if $changed = false otherwise some idiot can null-edit a
3624                 # load of user talk pages and piss people off, nor if it's a minor edit
3625                 # by a properly-flagged bot.
3626                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
3627                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) )
3628                 ) {
3629                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
3630                                 $other = User::newFromName( $shortTitle, false );
3631                                 if ( !$other ) {
3632                                         wfDebug( __METHOD__ . ": invalid username\n" );
3633                                 } elseif ( User::isIP( $shortTitle ) ) {
3634                                         // An anonymous user
3635                                         $other->setNewtalk( true );
3636                                 } elseif ( $other->isLoggedIn() ) {
3637                                         $other->setNewtalk( true );
3638                                 } else {
3639                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
3640                                 }
3641                         }
3642                 }
3643
3644                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3645                         MessageCache::singleton()->replace( $shortTitle, $text );
3646                 }
3647
3648                 wfProfileOut( __METHOD__ );
3649         }
3650
3651         /**
3652          * Perform article updates on a special page creation.
3653          *
3654          * @param $rev Revision object
3655          *
3656          * @todo This is a shitty interface function. Kill it and replace the
3657          * other shitty functions like editUpdates and such so it's not needed
3658          * anymore.
3659          */
3660         public function createUpdates( $rev ) {
3661                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3662                 $this->mTotalAdjustment = 1;
3663                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3664                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3665         }
3666
3667         /**
3668          * Generate the navigation links when browsing through an article revisions
3669          * It shows the information as:
3670          *   Revision as of \<date\>; view current revision
3671          *   \<- Previous version | Next Version -\>
3672          *
3673          * @param $oldid String: revision ID of this article revision
3674          */
3675         public function setOldSubtitle( $oldid = 0 ) {
3676                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3677
3678                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3679                         return;
3680                 }
3681
3682                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
3683
3684                 # Cascade unhide param in links for easy deletion browsing
3685                 $extraParams = array();
3686                 if ( $wgRequest->getVal( 'unhide' ) ) {
3687                         $extraParams['unhide'] = 1;
3688                 }
3689
3690                 $revision = Revision::newFromId( $oldid );
3691
3692                 $current = ( $oldid == $this->mLatest );
3693                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3694                 $tddate = $wgLang->date( $this->mTimestamp, true );
3695                 $tdtime = $wgLang->time( $this->mTimestamp, true );
3696                 $sk = $wgUser->getSkin();
3697                 $lnk = $current
3698                         ? wfMsgHtml( 'currentrevisionlink' )
3699                         : $sk->link(
3700                                 $this->mTitle,
3701                                 wfMsgHtml( 'currentrevisionlink' ),
3702                                 array(),
3703                                 $extraParams,
3704                                 array( 'known', 'noclasses' )
3705                         );
3706                 $curdiff = $current
3707                         ? wfMsgHtml( 'diff' )
3708                         : $sk->link(
3709                                 $this->mTitle,
3710                                 wfMsgHtml( 'diff' ),
3711                                 array(),
3712                                 array(
3713                                         'diff' => 'cur',
3714                                         'oldid' => $oldid
3715                                 ) + $extraParams,
3716                                 array( 'known', 'noclasses' )
3717                         );
3718                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3719                 $prevlink = $prev
3720                         ? $sk->link(
3721                                 $this->mTitle,
3722                                 wfMsgHtml( 'previousrevision' ),
3723                                 array(),
3724                                 array(
3725                                         'direction' => 'prev',
3726                                         'oldid' => $oldid
3727                                 ) + $extraParams,
3728                                 array( 'known', 'noclasses' )
3729                         )
3730                         : wfMsgHtml( 'previousrevision' );
3731                 $prevdiff = $prev
3732                         ? $sk->link(
3733                                 $this->mTitle,
3734                                 wfMsgHtml( 'diff' ),
3735                                 array(),
3736                                 array(
3737                                         'diff' => 'prev',
3738                                         'oldid' => $oldid
3739                                 ) + $extraParams,
3740                                 array( 'known', 'noclasses' )
3741                         )
3742                         : wfMsgHtml( 'diff' );
3743                 $nextlink = $current
3744                         ? wfMsgHtml( 'nextrevision' )
3745                         : $sk->link(
3746                                 $this->mTitle,
3747                                 wfMsgHtml( 'nextrevision' ),
3748                                 array(),
3749                                 array(
3750                                         'direction' => 'next',
3751                                         'oldid' => $oldid
3752                                 ) + $extraParams,
3753                                 array( 'known', 'noclasses' )
3754                         );
3755                 $nextdiff = $current
3756                         ? wfMsgHtml( 'diff' )
3757                         : $sk->link(
3758                                 $this->mTitle,
3759                                 wfMsgHtml( 'diff' ),
3760                                 array(),
3761                                 array(
3762                                         'diff' => 'next',
3763                                         'oldid' => $oldid
3764                                 ) + $extraParams,
3765                                 array( 'known', 'noclasses' )
3766                         );
3767
3768                 $cdel = '';
3769
3770                 // User can delete revisions or view deleted revisions...
3771                 $canHide = $wgUser->isAllowed( 'deleterevision' );
3772                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
3773                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3774                                 $cdel = $sk->revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
3775                         } else {
3776                                 $query = array(
3777                                         'type'   => 'revision',
3778                                         'target' => $this->mTitle->getPrefixedDbkey(),
3779                                         'ids'    => $oldid
3780                                 );
3781                                 $cdel = $sk->revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
3782                         }
3783                         $cdel .= ' ';
3784                 }
3785
3786                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3787                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3788
3789                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
3790                         ? 'revision-info-current'
3791                         : 'revision-info';
3792
3793                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
3794                         wfMsgExt(
3795                                 $infomsg,
3796                                 array( 'parseinline', 'replaceafter' ),
3797                                 $td,
3798                                 $userlinks,
3799                                 $revision->getID(),
3800                                 $tddate,
3801                                 $tdtime,
3802                                 $revision->getUser()
3803                         ) .
3804                         "</div>\n" .
3805                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3806                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3807
3808                 $wgOut->addHTML( $r );
3809         }
3810
3811         /**
3812          * This function is called right before saving the wikitext,
3813          * so we can do things like signatures and links-in-context.
3814          *
3815          * @param $text String article contents
3816          * @param $user User object: user doing the edit, $wgUser will be used if
3817          *              null is given
3818          * @param $popts ParserOptions object: parser options, default options for
3819          *               the user loaded if null given
3820          * @return string article contents with altered wikitext markup (signatures
3821          *      converted, {{subst:}}, templates, etc.)
3822          */
3823         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3824                 global $wgParser;
3825
3826                 if ( $user === null ) {
3827                         global $wgUser;
3828                         $user = $wgUser;
3829                 }
3830
3831                 if ( $popts === null ) {
3832                         $popts = ParserOptions::newFromUser( $user );
3833                 }
3834
3835                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3836         }
3837
3838         /* Caching functions */
3839
3840         /**
3841          * checkLastModified returns true if it has taken care of all
3842          * output to the client that is necessary for this request.
3843          * (that is, it has sent a cached version of the page)
3844          *
3845          * @return boolean true if cached version send, false otherwise
3846          */
3847         protected function tryFileCache() {
3848                 static $called = false;
3849
3850                 if ( $called ) {
3851                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3852                         return false;
3853                 }
3854
3855                 $called = true;
3856                 if ( $this->isFileCacheable() ) {
3857                         $cache = new HTMLFileCache( $this->mTitle );
3858                         if ( $cache->isFileCacheGood( $this->mTouched ) ) {
3859                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3860                                 $cache->loadFromFileCache();
3861                                 return true;
3862                         } else {
3863                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3864                                 ob_start( array( &$cache, 'saveToFileCache' ) );
3865                         }
3866                 } else {
3867                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3868                 }
3869
3870                 return false;
3871         }
3872
3873         /**
3874          * Check if the page can be cached
3875          * @return bool
3876          */
3877         public function isFileCacheable() {
3878                 $cacheable = false;
3879
3880                 if ( HTMLFileCache::useFileCache() ) {
3881                         $cacheable = $this->getID() && !$this->mRedirectedFrom && !$this->mTitle->isRedirect();
3882                         // Extension may have reason to disable file caching on some pages.
3883                         if ( $cacheable ) {
3884                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3885                         }
3886                 }
3887
3888                 return $cacheable;
3889         }
3890
3891         /**
3892          * Loads page_touched and returns a value indicating if it should be used
3893          * @return boolean true if not a redirect
3894          */
3895         public function checkTouched() {
3896                 if ( !$this->mDataLoaded ) {
3897                         $this->loadPageData();
3898                 }
3899
3900                 return !$this->mIsRedirect;
3901         }
3902
3903         /**
3904          * Get the page_touched field
3905          * @return string containing GMT timestamp
3906          */
3907         public function getTouched() {
3908                 if ( !$this->mDataLoaded ) {
3909                         $this->loadPageData();
3910                 }
3911
3912                 return $this->mTouched;
3913         }
3914
3915         /**
3916          * Get the page_latest field
3917          * @return integer rev_id of current revision
3918          */
3919         public function getLatest() {
3920                 if ( !$this->mDataLoaded ) {
3921                         $this->loadPageData();
3922                 }
3923
3924                 return (int)$this->mLatest;
3925         }
3926
3927         /**
3928          * Edit an article without doing all that other stuff
3929          * The article must already exist; link tables etc
3930          * are not updated, caches are not flushed.
3931          *
3932          * @param $text String: text submitted
3933          * @param $comment String: comment submitted
3934          * @param $minor Boolean: whereas it's a minor modification
3935          */
3936         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3937                 wfProfileIn( __METHOD__ );
3938
3939                 $dbw = wfGetDB( DB_MASTER );
3940                 $revision = new Revision( array(
3941                         'page'       => $this->getId(),
3942                         'text'       => $text,
3943                         'comment'    => $comment,
3944                         'minor_edit' => $minor ? 1 : 0,
3945                         ) );
3946                 $revision->insertOn( $dbw );
3947                 $this->updateRevisionOn( $dbw, $revision );
3948
3949                 global $wgUser;
3950                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $wgUser ) );
3951
3952                 wfProfileOut( __METHOD__ );
3953         }
3954
3955         /**
3956          * The onArticle*() functions are supposed to be a kind of hooks
3957          * which should be called whenever any of the specified actions
3958          * are done.
3959          *
3960          * This is a good place to put code to clear caches, for instance.
3961          *
3962          * This is called on page move and undelete, as well as edit
3963          *
3964          * @param $title Title object
3965          */
3966         public static function onArticleCreate( $title ) {
3967                 # Update existence markers on article/talk tabs...
3968                 if ( $title->isTalkPage() ) {
3969                         $other = $title->getSubjectPage();
3970                 } else {
3971                         $other = $title->getTalkPage();
3972                 }
3973
3974                 $other->invalidateCache();
3975                 $other->purgeSquid();
3976
3977                 $title->touchLinks();
3978                 $title->purgeSquid();
3979                 $title->deleteTitleProtection();
3980         }
3981
3982         /**
3983          * Clears caches when article is deleted
3984          */
3985         public static function onArticleDelete( $title ) {
3986                 # Update existence markers on article/talk tabs...
3987                 if ( $title->isTalkPage() ) {
3988                         $other = $title->getSubjectPage();
3989                 } else {
3990                         $other = $title->getTalkPage();
3991                 }
3992
3993                 $other->invalidateCache();
3994                 $other->purgeSquid();
3995
3996                 $title->touchLinks();
3997                 $title->purgeSquid();
3998
3999                 # File cache
4000                 HTMLFileCache::clearFileCache( $title );
4001
4002                 # Messages
4003                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
4004                         MessageCache::singleton()->replace( $title->getDBkey(), false );
4005                 }
4006
4007                 # Images
4008                 if ( $title->getNamespace() == NS_FILE ) {
4009                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
4010                         $update->doUpdate();
4011                 }
4012
4013                 # User talk pages
4014                 if ( $title->getNamespace() == NS_USER_TALK ) {
4015                         $user = User::newFromName( $title->getText(), false );
4016                         $user->setNewtalk( false );
4017                 }
4018
4019                 # Image redirects
4020                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
4021         }
4022
4023         /**
4024          * Purge caches on page update etc
4025          *
4026          * @param $title Title object
4027          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
4028          */
4029         public static function onArticleEdit( $title ) {
4030                 global $wgDeferredUpdateList;
4031
4032                 // Invalidate caches of articles which include this page
4033                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
4034
4035                 // Invalidate the caches of all pages which redirect here
4036                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
4037
4038                 # Purge squid for this page only
4039                 $title->purgeSquid();
4040
4041                 # Clear file cache for this page only
4042                 HTMLFileCache::clearFileCache( $title );
4043         }
4044
4045         /**#@-*/
4046
4047         /**
4048          * Overriden by ImagePage class, only present here to avoid a fatal error
4049          * Called for ?action=revert
4050          */
4051         public function revert() {
4052                 global $wgOut;
4053                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4054         }
4055
4056         /**
4057          * Info about this page
4058          * Called for ?action=info when $wgAllowPageInfo is on.
4059          */
4060         public function info() {
4061                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
4062
4063                 if ( !$wgAllowPageInfo ) {
4064                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
4065                         return;
4066                 }
4067
4068                 $page = $this->mTitle->getSubjectPage();
4069
4070                 $wgOut->setPagetitle( $page->getPrefixedText() );
4071                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
4072                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
4073
4074                 if ( !$this->mTitle->exists() ) {
4075                         $wgOut->addHTML( '<div class="noarticletext">' );
4076                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
4077                                 // This doesn't quite make sense; the user is asking for
4078                                 // information about the _page_, not the message... -- RC
4079                                 $wgOut->addHTML( htmlspecialchars( $this->mTitle->getDefaultMessageText() ) );
4080                         } else {
4081                                 $msg = $wgUser->isLoggedIn()
4082                                         ? 'noarticletext'
4083                                         : 'noarticletextanon';
4084                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
4085                         }
4086
4087                         $wgOut->addHTML( '</div>' );
4088                 } else {
4089                         $dbr = wfGetDB( DB_SLAVE );
4090                         $wl_clause = array(
4091                                 'wl_title'     => $page->getDBkey(),
4092                                 'wl_namespace' => $page->getNamespace() );
4093                         $numwatchers = $dbr->selectField(
4094                                 'watchlist',
4095                                 'COUNT(*)',
4096                                 $wl_clause,
4097                                 __METHOD__,
4098                                 $this->getSelectOptions() );
4099
4100                         $pageInfo = $this->pageCountInfo( $page );
4101                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
4102
4103
4104                         //FIXME: unescaped messages
4105                         $wgOut->addHTML( "<ul><li>" . wfMsg( "numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
4106                         $wgOut->addHTML( "<li>" . wfMsg( 'numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>' );
4107
4108                         if ( $talkInfo ) {
4109                                 $wgOut->addHTML( '<li>' . wfMsg( "numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>' );
4110                         }
4111
4112                         $wgOut->addHTML( '<li>' . wfMsg( "numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
4113
4114                         if ( $talkInfo ) {
4115                                 $wgOut->addHTML( '<li>' . wfMsg( 'numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
4116                         }
4117
4118                         $wgOut->addHTML( '</ul>' );
4119                 }
4120         }
4121
4122         /**
4123          * Return the total number of edits and number of unique editors
4124          * on a given page. If page does not exist, returns false.
4125          *
4126          * @param $title Title object
4127          * @return mixed array or boolean false
4128          */
4129         public function pageCountInfo( $title ) {
4130                 $id = $title->getArticleId();
4131
4132                 if ( $id == 0 ) {
4133                         return false;
4134                 }
4135
4136                 $dbr = wfGetDB( DB_SLAVE );
4137                 $rev_clause = array( 'rev_page' => $id );
4138                 $edits = $dbr->selectField(
4139                         'revision',
4140                         'COUNT(rev_page)',
4141                         $rev_clause,
4142                         __METHOD__,
4143                         $this->getSelectOptions()
4144                 );
4145                 $authors = $dbr->selectField(
4146                         'revision',
4147                         'COUNT(DISTINCT rev_user_text)',
4148                         $rev_clause,
4149                         __METHOD__,
4150                         $this->getSelectOptions()
4151                 );
4152
4153                 return array( 'edits' => $edits, 'authors' => $authors );
4154         }
4155
4156         /**
4157          * Return a list of templates used by this article.
4158          * Uses the templatelinks table
4159          *
4160          * @return Array of Title objects
4161          */
4162         public function getUsedTemplates() {
4163                 $result = array();
4164                 $id = $this->mTitle->getArticleID();
4165
4166                 if ( $id == 0 ) {
4167                         return array();
4168                 }
4169
4170                 $dbr = wfGetDB( DB_SLAVE );
4171                 $res = $dbr->select( array( 'templatelinks' ),
4172                         array( 'tl_namespace', 'tl_title' ),
4173                         array( 'tl_from' => $id ),
4174                         __METHOD__ );
4175
4176                 if ( $res !== false ) {
4177                         foreach ( $res as $row ) {
4178                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
4179                         }
4180                 }
4181
4182                 return $result;
4183         }
4184
4185         /**
4186          * Returns a list of hidden categories this page is a member of.
4187          * Uses the page_props and categorylinks tables.
4188          *
4189          * @return Array of Title objects
4190          */
4191         public function getHiddenCategories() {
4192                 $result = array();
4193                 $id = $this->mTitle->getArticleID();
4194
4195                 if ( $id == 0 ) {
4196                         return array();
4197                 }
4198
4199                 $dbr = wfGetDB( DB_SLAVE );
4200                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
4201                         array( 'cl_to' ),
4202                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
4203                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
4204                         __METHOD__ );
4205
4206                 if ( $res !== false ) {
4207                         foreach ( $res as $row ) {
4208                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
4209                         }
4210                 }
4211
4212                 return $result;
4213         }
4214
4215         /**
4216         * Return an applicable autosummary if one exists for the given edit.
4217         * @param $oldtext String: the previous text of the page.
4218         * @param $newtext String: The submitted text of the page.
4219         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
4220         * @return string An appropriate autosummary, or an empty string.
4221         */
4222         public static function getAutosummary( $oldtext, $newtext, $flags ) {
4223                 global $wgContLang;
4224
4225                 # Decide what kind of autosummary is needed.
4226
4227                 # Redirect autosummaries
4228                 $ot = Title::newFromRedirect( $oldtext );
4229                 $rt = Title::newFromRedirect( $newtext );
4230
4231                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
4232                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
4233                 }
4234
4235                 # New page autosummaries
4236                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
4237                         # If they're making a new article, give its text, truncated, in the summary.
4238
4239                         $truncatedtext = $wgContLang->truncate(
4240                                 str_replace( "\n", ' ', $newtext ),
4241                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
4242
4243                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
4244                 }
4245
4246                 # Blanking autosummaries
4247                 if ( $oldtext != '' && $newtext == '' ) {
4248                         return wfMsgForContent( 'autosumm-blank' );
4249                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
4250                         # Removing more than 90% of the article
4251
4252                         $truncatedtext = $wgContLang->truncate(
4253                                 $newtext,
4254                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
4255
4256                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
4257                 }
4258
4259                 # If we reach this point, there's no applicable autosummary for our case, so our
4260                 # autosummary is empty.
4261                 return '';
4262         }
4263
4264         /**
4265          * Add the primary page-view wikitext to the output buffer
4266          * Saves the text into the parser cache if possible.
4267          * Updates templatelinks if it is out of date.
4268          *
4269          * @param $text String
4270          * @param $cache Boolean
4271          * @param $parserOptions mixed ParserOptions object, or boolean false
4272          */
4273         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
4274                 global $wgOut;
4275
4276                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
4277                 $wgOut->addParserOutput( $this->mParserOutput );
4278         }
4279
4280         /**
4281          * This does all the heavy lifting for outputWikitext, except it returns the parser
4282          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
4283          * say, embedding thread pages within a discussion system (LiquidThreads)
4284          *
4285          * @param $text string
4286          * @param $cache boolean
4287          * @param $parserOptions parsing options, defaults to false
4288          * @return string containing parsed output
4289          */
4290         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
4291                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
4292
4293                 if ( !$parserOptions ) {
4294                         $parserOptions = $this->getParserOptions();
4295                 }
4296
4297                 $time = - wfTime();
4298                 $this->mParserOutput = $wgParser->parse( $text, $this->mTitle,
4299                         $parserOptions, true, true, $this->getRevIdFetched() );
4300                 $time += wfTime();
4301
4302                 # Timing hack
4303                 if ( $time > 3 ) {
4304                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
4305                                 $this->mTitle->getPrefixedDBkey() ) );
4306                 }
4307
4308                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
4309                         $parserCache = ParserCache::singleton();
4310                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
4311                 }
4312
4313                 // Make sure file cache is not used on uncacheable content.
4314                 // Output that has magic words in it can still use the parser cache
4315                 // (if enabled), though it will generally expire sooner.
4316                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
4317                         $wgUseFileCache = false;
4318                 }
4319
4320                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
4321
4322                 return $this->mParserOutput;
4323         }
4324
4325         /**
4326          * Get parser options suitable for rendering the primary article wikitext
4327          * @return mixed ParserOptions object or boolean false
4328          */
4329         public function getParserOptions() {
4330                 global $wgUser;
4331
4332                 if ( !$this->mParserOptions ) {
4333                         $this->mParserOptions = new ParserOptions( $wgUser );
4334                         $this->mParserOptions->setTidy( true );
4335                         $this->mParserOptions->enableLimitReport();
4336                 }
4337
4338                 // Clone to allow modifications of the return value without affecting
4339                 // the cache
4340                 return clone $this->mParserOptions;
4341         }
4342
4343         /**
4344          * Updates cascading protections
4345          *
4346          * @param $parserOutput mixed ParserOptions object, or boolean false
4347          **/
4348         protected function doCascadeProtectionUpdates( $parserOutput ) {
4349                 if ( !$this->isCurrent() || wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
4350                         return;
4351                 }
4352
4353                 // templatelinks table may have become out of sync,
4354                 // especially if using variable-based transclusions.
4355                 // For paranoia, check if things have changed and if
4356                 // so apply updates to the database. This will ensure
4357                 // that cascaded protections apply as soon as the changes
4358                 // are visible.
4359
4360                 # Get templates from templatelinks
4361                 $id = $this->mTitle->getArticleID();
4362
4363                 $tlTemplates = array();
4364
4365                 $dbr = wfGetDB( DB_SLAVE );
4366                 $res = $dbr->select( array( 'templatelinks' ),
4367                         array( 'tl_namespace', 'tl_title' ),
4368                         array( 'tl_from' => $id ),
4369                         __METHOD__
4370                 );
4371
4372                 foreach ( $res as $row ) {
4373                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
4374                 }
4375
4376                 # Get templates from parser output.
4377                 $poTemplates = array();
4378                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
4379                         foreach ( $templates as $dbk => $id ) {
4380                                 $poTemplates["$ns:$dbk"] = true;
4381                         }
4382                 }
4383
4384                 # Get the diff
4385                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
4386
4387                 if ( count( $templates_diff ) > 0 ) {
4388                         # Whee, link updates time.
4389                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
4390                         $u->doUpdate();
4391                 }
4392         }
4393
4394         /**
4395          * Update all the appropriate counts in the category table, given that
4396          * we've added the categories $added and deleted the categories $deleted.
4397          *
4398          * @param $added array   The names of categories that were added
4399          * @param $deleted array The names of categories that were deleted
4400          */
4401         public function updateCategoryCounts( $added, $deleted ) {
4402                 $ns = $this->mTitle->getNamespace();
4403                 $dbw = wfGetDB( DB_MASTER );
4404
4405                 # First make sure the rows exist.  If one of the "deleted" ones didn't
4406                 # exist, we might legitimately not create it, but it's simpler to just
4407                 # create it and then give it a negative value, since the value is bogus
4408                 # anyway.
4409                 #
4410                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
4411                 $insertCats = array_merge( $added, $deleted );
4412                 if ( !$insertCats ) {
4413                         # Okay, nothing to do
4414                         return;
4415                 }
4416
4417                 $insertRows = array();
4418
4419                 foreach ( $insertCats as $cat ) {
4420                         $insertRows[] = array(
4421                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
4422                                 'cat_title' => $cat
4423                         );
4424                 }
4425                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
4426
4427                 $addFields    = array( 'cat_pages = cat_pages + 1' );
4428                 $removeFields = array( 'cat_pages = cat_pages - 1' );
4429
4430                 if ( $ns == NS_CATEGORY ) {
4431                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
4432                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
4433                 } elseif ( $ns == NS_FILE ) {
4434                         $addFields[]    = 'cat_files = cat_files + 1';
4435                         $removeFields[] = 'cat_files = cat_files - 1';
4436                 }
4437
4438                 if ( $added ) {
4439                         $dbw->update(
4440                                 'category',
4441                                 $addFields,
4442                                 array( 'cat_title' => $added ),
4443                                 __METHOD__
4444                         );
4445                 }
4446
4447                 if ( $deleted ) {
4448                         $dbw->update(
4449                                 'category',
4450                                 $removeFields,
4451                                 array( 'cat_title' => $deleted ),
4452                                 __METHOD__
4453                         );
4454                 }
4455         }
4456
4457         /**
4458          * Lightweight method to get the parser output for a page, checking the parser cache
4459          * and so on. Doesn't consider most of the stuff that Article::view is forced to
4460          * consider, so it's not appropriate to use there.
4461          *
4462          * @since 1.16 (r52326) for LiquidThreads
4463          *
4464          * @param $oldid mixed integer Revision ID or null
4465          * @return ParserOutput or false if the given revsion ID is not found
4466          */
4467         public function getParserOutput( $oldid = null ) {
4468                 global $wgEnableParserCache, $wgUser;
4469
4470                 // Should the parser cache be used?
4471                 $useParserCache = $wgEnableParserCache &&
4472                         $wgUser->getStubThreshold() == 0 &&
4473                         $this->exists() &&
4474                         $oldid === null;
4475
4476                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
4477
4478                 if ( $wgUser->getStubThreshold() ) {
4479                         wfIncrStats( 'pcache_miss_stub' );
4480                 }
4481
4482                 if ( $useParserCache ) {
4483                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
4484                         if ( $parserOutput !== false ) {
4485                                 return $parserOutput;
4486                         }
4487                 }
4488
4489                 // Cache miss; parse and output it.
4490                 if ( $oldid === null ) {
4491                         $text = $this->getRawText();
4492                 } else {
4493                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
4494                         if ( $rev === null ) {
4495                                 return false;
4496                         }
4497                         $text = $rev->getText();
4498                 }
4499
4500                 return $this->getOutputFromWikitext( $text, $useParserCache );
4501         }
4502
4503 }
4504
4505 class PoolWorkArticleView extends PoolCounterWork {
4506         private $mArticle;
4507
4508         function __construct( $article, $key, $useParserCache, $parserOptions ) {
4509                 parent::__construct( 'ArticleView', $key );
4510                 $this->mArticle = $article;
4511                 $this->cacheable = $useParserCache;
4512                 $this->parserOptions = $parserOptions;
4513         }
4514
4515         function doWork() {
4516                 return $this->mArticle->doViewParse();
4517         }
4518
4519         function getCachedWork() {
4520                 global $wgOut;
4521
4522                 $parserCache = ParserCache::singleton();
4523                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
4524
4525                 if ( $this->mArticle->mParserOutput !== false ) {
4526                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
4527                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
4528                         # Ensure that UI elements requiring revision ID have
4529                         # the correct version information.
4530                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
4531                         return true;
4532                 }
4533                 return false;
4534         }
4535
4536         function fallback() {
4537                 return $this->mArticle->tryDirtyCache();
4538         }
4539
4540         function error( $status ) {
4541                 global $wgOut;
4542
4543                 $wgOut->clearHTML(); // for release() errors
4544                 $wgOut->enableClientCache( false );
4545                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
4546
4547                 $errortext = $status->getWikiText( false, 'view-pool-error' );
4548                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
4549
4550                 return false;
4551         }
4552 }