includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  */
   5
   6 /**
   7  * Class representing a MediaWiki article and history.
   8  *
   9  * See design.txt for an overview.
  10  * Note: edit user interface and cache support functions have been
  11  * moved to separate EditPage and HTMLFileCache classes.
  12  *
  13  */
  14 class Article {
  15         /**@{{
  16          * @private
  17          */
  18         var $mComment;                  //!<
  19         var $mContent;                  //!<
  20         var $mContentLoaded;    //!<
  21         var $mCounter;                  //!<
  22         var $mForUpdate;                //!<
  23         var $mGoodAdjustment;   //!<
  24         var $mLatest;                   //!<
  25         var $mMinorEdit;                //!<
  26         var $mOldId;                    //!<
  27         var $mRedirectedFrom;   //!<
  28         var $mRedirectUrl;              //!<
  29         var $mRevIdFetched;             //!<
  30         var $mRevision;                 //!<
  31         var $mTimestamp;                //!<
  32         var $mTitle;                    //!<
  33         var $mTotalAdjustment;  //!<
  34         var $mTouched;                  //!<
  35         var $mUser;                             //!<
  36         var $mUserText;                 //!<
  37         /**@}}*/
  38
  39         /**
  40          * Constants used by internal components to get rollback results
  41          */
  42         const SUCCESS = 0;                      // Operation successful
  43         const PERM_DENIED = 1;          // Permission denied
  44         const BLOCKED = 2;                      // User has been blocked
  45         const READONLY = 3;                     // Wiki is in read-only mode
  46         const BAD_TOKEN = 4;            // Invalid token specified
  47         const BAD_TITLE = 5;            // $this is not a valid Article
  48         const ALREADY_ROLLED = 6;       // Someone else already rolled this back. $from and $summary will be set
  49         const ONLY_AUTHOR = 7;          // User is the only author of the page
  50
  51         /**
  52          * Constructor and clear the article
  53          * @param $title Reference to a Title object.
  54          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  55          */
  56         function __construct( &$title, $oldId = null ) {
  57                 $this->mTitle =& $title;
  58                 $this->mOldId = $oldId;
  59                 $this->clear();
  60         }
  61
  62         /**
  63          * Tell the page view functions that this view was redirected
  64          * from another page on the wiki.
  65          * @param $from Title object.
  66          */
  67         function setRedirectedFrom( $from ) {
  68                 $this->mRedirectedFrom = $from;
  69         }
  70
  71         /**
  72          * @return mixed false, Title of in-wiki target, or string with URL
  73          */
  74         function followRedirect() {
  75                 $text = $this->getContent();
  76                 $rt = Title::newFromRedirect( $text );
  77
  78                 # process if title object is valid and not special:userlogout
  79                 if( $rt ) {
  80                         if( $rt->getInterwiki() != '' ) {
  81                                 if( $rt->isLocal() ) {
  82                                         // Offsite wikis need an HTTP redirect.
  83                                         //
  84                                         // This can be hard to reverse and may produce loops,
  85                                         // so they may be disabled in the site configuration.
  86
  87                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  88                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  89                                 }
  90                         } else {
  91                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  92                                         // Gotta handle redirects to special pages differently:
  93                                         // Fill the HTTP response "Location" header and ignore
  94                                         // the rest of the page we're on.
  95                                         //
  96                                         // This can be hard to reverse, so they may be disabled.
  97
  98                                         if( $rt->isSpecial( 'Userlogout' ) ) {
  99                                                 // rolleyes
 100                                         } else {
 101                                                 return $rt->getFullURL();
 102                                         }
 103                                 }
 104                                 return $rt;
 105                         }
 106                 }
 107
 108                 // No or invalid redirect
 109                 return false;
 110         }
 111
 112         /**
 113          * get the title object of the article
 114          */
 115         function getTitle() {
 116                 return $this->mTitle;
 117         }
 118
 119         /**
 120           * Clear the object
 121           * @private
 122           */
 123         function clear() {
 124                 $this->mDataLoaded    = false;
 125                 $this->mContentLoaded = false;
 126
 127                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 128                 $this->mRedirectedFrom = null; # Title object if set
 129                 $this->mUserText =
 130                 $this->mTimestamp = $this->mComment = '';
 131                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 132                 $this->mTouched = '19700101000000';
 133                 $this->mForUpdate = false;
 134                 $this->mIsRedirect = false;
 135                 $this->mRevIdFetched = 0;
 136                 $this->mRedirectUrl = false;
 137                 $this->mLatest = false;
 138         }
 139
 140         /**
 141          * Note that getContent/loadContent do not follow redirects anymore.
 142          * If you need to fetch redirectable content easily, try
 143          * the shortcut in Article::followContent()
 144          * FIXME
 145          * @todo There are still side-effects in this!
 146          *        In general, you should use the Revision class, not Article,
 147          *        to fetch text for purposes other than page views.
 148          *
 149          * @return Return the text of this revision
 150         */
 151         function getContent() {
 152                 global $wgUser, $wgOut;
 153
 154                 wfProfileIn( __METHOD__ );
 155
 156                 if ( 0 == $this->getID() ) {
 157                         wfProfileOut( __METHOD__ );
 158                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 159
 160                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 161                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 162                         } else {
 163                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 164                         }
 165
 166                         return "<div class='noarticletext'>$ret</div>";
 167                 } else {
 168                         $this->loadContent();
 169                         wfProfileOut( __METHOD__ );
 170                         return $this->mContent;
 171                 }
 172         }
 173
 174         /**
 175          * This function returns the text of a section, specified by a number ($section).
 176          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 177          * the first section before any such heading (section 0).
 178          *
 179          * If a section contains subsections, these are also returned.
 180          *
 181          * @param $text String: text to look in
 182          * @param $section Integer: section number
 183          * @return string text of the requested section
 184          * @deprecated
 185          */
 186         function getSection($text,$section) {
 187                 global $wgParser;
 188                 return $wgParser->getSection( $text, $section );
 189         }
 190
 191         /**
 192          * @return int The oldid of the article that is to be shown, 0 for the
 193          *             current revision
 194          */
 195         function getOldID() {
 196                 if ( is_null( $this->mOldId ) ) {
 197                         $this->mOldId = $this->getOldIDFromRequest();
 198                 }
 199                 return $this->mOldId;
 200         }
 201
 202         /**
 203          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 204          *
 205          * @return int The old id for the request
 206          */
 207         function getOldIDFromRequest() {
 208                 global $wgRequest;
 209                 $this->mRedirectUrl = false;
 210                 $oldid = $wgRequest->getVal( 'oldid' );
 211                 if ( isset( $oldid ) ) {
 212                         $oldid = intval( $oldid );
 213                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 214                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 215                                 if ( $nextid  ) {
 216                                         $oldid = $nextid;
 217                                 } else {
 218                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 219                                 }
 220                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 221                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 222                                 if ( $previd ) {
 223                                         $oldid = $previd;
 224                                 } else {
 225                                         # TODO
 226                                 }
 227                         }
 228                         # unused:
 229                         # $lastid = $oldid;
 230                 }
 231
 232                 if ( !$oldid ) {
 233                         $oldid = 0;
 234                 }
 235                 return $oldid;
 236         }
 237
 238         /**
 239          * Load the revision (including text) into this object
 240          */
 241         function loadContent() {
 242                 if ( $this->mContentLoaded ) return;
 243
 244                 # Query variables :P
 245                 $oldid = $this->getOldID();
 246
 247                 # Pre-fill content with error message so that if something
 248                 # fails we'll have something telling us what we intended.
 249                 $this->mOldId = $oldid;
 250                 $this->fetchContent( $oldid );
 251         }
 252
 253
 254         /**
 255          * Fetch a page record with the given conditions
 256          * @param Database $dbr
 257          * @param array    $conditions
 258          * @private
 259          */
 260         function pageData( $dbr, $conditions ) {
 261                 $fields = array(
 262                                 'page_id',
 263                                 'page_namespace',
 264                                 'page_title',
 265                                 'page_restrictions',
 266                                 'page_counter',
 267                                 'page_is_redirect',
 268                                 'page_is_new',
 269                                 'page_random',
 270                                 'page_touched',
 271                                 'page_latest',
 272                                 'page_len',
 273                 );
 274                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 275                 $row = $dbr->selectRow(
 276                         'page',
 277                         $fields,
 278                         $conditions,
 279                         __METHOD__
 280                 );
 281                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 282                 return $row ;
 283         }
 284
 285         /**
 286          * @param Database $dbr
 287          * @param Title $title
 288          */
 289         function pageDataFromTitle( $dbr, $title ) {
 290                 return $this->pageData( $dbr, array(
 291                         'page_namespace' => $title->getNamespace(),
 292                         'page_title'     => $title->getDBkey() ) );
 293         }
 294
 295         /**
 296          * @param Database $dbr
 297          * @param int $id
 298          */
 299         function pageDataFromId( $dbr, $id ) {
 300                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 301         }
 302
 303         /**
 304          * Set the general counter, title etc data loaded from
 305          * some source.
 306          *
 307          * @param object $data
 308          * @private
 309          */
 310         function loadPageData( $data = 'fromdb' ) {
 311                 if ( $data === 'fromdb' ) {
 312                         $dbr = $this->getDB();
 313                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 314                 }
 315
 316                 $lc =& LinkCache::singleton();
 317                 if ( $data ) {
 318                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 319
 320                         $this->mTitle->mArticleID = $data->page_id;
 321
 322                         # Old-fashioned restrictions.
 323                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 324
 325                         $this->mCounter     = $data->page_counter;
 326                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 327                         $this->mIsRedirect  = $data->page_is_redirect;
 328                         $this->mLatest      = $data->page_latest;
 329                 } else {
 330                         if ( is_object( $this->mTitle ) ) {
 331                                 $lc->addBadLinkObj( $this->mTitle );
 332                         }
 333                         $this->mTitle->mArticleID = 0;
 334                 }
 335
 336                 $this->mDataLoaded  = true;
 337         }
 338
 339         /**
 340          * Get text of an article from database
 341          * Does *NOT* follow redirects.
 342          * @param int $oldid 0 for whatever the latest revision is
 343          * @return string
 344          */
 345         function fetchContent( $oldid = 0 ) {
 346                 if ( $this->mContentLoaded ) {
 347                         return $this->mContent;
 348                 }
 349
 350                 $dbr = $this->getDB();
 351
 352                 # Pre-fill content with error message so that if something
 353                 # fails we'll have something telling us what we intended.
 354                 $t = $this->mTitle->getPrefixedText();
 355                 if( $oldid ) {
 356                         $t .= ',oldid='.$oldid;
 357                 }
 358                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 359
 360                 if( $oldid ) {
 361                         $revision = Revision::newFromId( $oldid );
 362                         if( is_null( $revision ) ) {
 363                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 364                                 return false;
 365                         }
 366                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 367                         if( !$data ) {
 368                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 369                                 return false;
 370                         }
 371                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 372                         $this->loadPageData( $data );
 373                 } else {
 374                         if( !$this->mDataLoaded ) {
 375                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 376                                 if( !$data ) {
 377                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 378                                         return false;
 379                                 }
 380                                 $this->loadPageData( $data );
 381                         }
 382                         $revision = Revision::newFromId( $this->mLatest );
 383                         if( is_null( $revision ) ) {
 384                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 385                                 return false;
 386                         }
 387                 }
 388
 389                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 390                 // We should instead work with the Revision object when we need it...
 391                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 392                 //$this->mContent   = $revision->getText();
 393
 394                 $this->mUser      = $revision->getUser();
 395                 $this->mUserText  = $revision->getUserText();
 396                 $this->mComment   = $revision->getComment();
 397                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 398
 399                 $this->mRevIdFetched = $revision->getID();
 400                 $this->mContentLoaded = true;
 401                 $this->mRevision =& $revision;
 402
 403                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 404
 405                 return $this->mContent;
 406         }
 407
 408         /**
 409          * Read/write accessor to select FOR UPDATE
 410          *
 411          * @param $x Mixed: FIXME
 412          */
 413         function forUpdate( $x = NULL ) {
 414                 return wfSetVar( $this->mForUpdate, $x );
 415         }
 416
 417         /**
 418          * Get the database which should be used for reads
 419          *
 420          * @return Database
 421          */
 422         function getDB() {
 423                 return wfGetDB( DB_MASTER );
 424         }
 425
 426         /**
 427          * Get options for all SELECT statements
 428          *
 429          * @param $options Array: an optional options array which'll be appended to
 430          *                       the default
 431          * @return Array: options
 432          */
 433         function getSelectOptions( $options = '' ) {
 434                 if ( $this->mForUpdate ) {
 435                         if ( is_array( $options ) ) {
 436                                 $options[] = 'FOR UPDATE';
 437                         } else {
 438                                 $options = 'FOR UPDATE';
 439                         }
 440                 }
 441                 return $options;
 442         }
 443
 444         /**
 445          * @return int Page ID
 446          */
 447         function getID() {
 448                 if( $this->mTitle ) {
 449                         return $this->mTitle->getArticleID();
 450                 } else {
 451                         return 0;
 452                 }
 453         }
 454
 455         /**
 456          * @return bool Whether or not the page exists in the database
 457          */
 458         function exists() {
 459                 return $this->getId() != 0;
 460         }
 461
 462         /**
 463          * @return int The view count for the page
 464          */
 465         function getCount() {
 466                 if ( -1 == $this->mCounter ) {
 467                         $id = $this->getID();
 468                         if ( $id == 0 ) {
 469                                 $this->mCounter = 0;
 470                         } else {
 471                                 $dbr = wfGetDB( DB_SLAVE );
 472                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 473                                         'Article::getCount', $this->getSelectOptions() );
 474                         }
 475                 }
 476                 return $this->mCounter;
 477         }
 478
 479         /**
 480          * Determine whether a page  would be suitable for being counted as an
 481          * article in the site_stats table based on the title & its content
 482          *
 483          * @param $text String: text to analyze
 484          * @return bool
 485          */
 486         function isCountable( $text ) {
 487                 global $wgUseCommaCount;
 488
 489                 $token = $wgUseCommaCount ? ',' : '[[';
 490                 return
 491                         $this->mTitle->isContentPage()
 492                         && !$this->isRedirect( $text )
 493                         && in_string( $token, $text );
 494         }
 495
 496         /**
 497          * Tests if the article text represents a redirect
 498          *
 499          * @param $text String: FIXME
 500          * @return bool
 501          */
 502         function isRedirect( $text = false ) {
 503                 if ( $text === false ) {
 504                         $this->loadContent();
 505                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 506                 } else {
 507                         $titleObj = Title::newFromRedirect( $text );
 508                 }
 509                 return $titleObj !== NULL;
 510         }
 511
 512         /**
 513          * Returns true if the currently-referenced revision is the current edit
 514          * to this page (and it exists).
 515          * @return bool
 516          */
 517         function isCurrent() {
 518                 # If no oldid, this is the current version.
 519                 if ($this->getOldID() == 0)
 520                         return true;
 521
 522                 return $this->exists() &&
 523                         isset( $this->mRevision ) &&
 524                         $this->mRevision->isCurrent();
 525         }
 526
 527         /**
 528          * Loads everything except the text
 529          * This isn't necessary for all uses, so it's only done if needed.
 530          * @private
 531          */
 532         function loadLastEdit() {
 533                 if ( -1 != $this->mUser )
 534                         return;
 535
 536                 # New or non-existent articles have no user information
 537                 $id = $this->getID();
 538                 if ( 0 == $id ) return;
 539
 540                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 541                 if( !is_null( $this->mLastRevision ) ) {
 542                         $this->mUser      = $this->mLastRevision->getUser();
 543                         $this->mUserText  = $this->mLastRevision->getUserText();
 544                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 545                         $this->mComment   = $this->mLastRevision->getComment();
 546                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 547                         $this->mRevIdFetched = $this->mLastRevision->getID();
 548                 }
 549         }
 550
 551         function getTimestamp() {
 552                 // Check if the field has been filled by ParserCache::get()
 553                 if ( !$this->mTimestamp ) {
 554                         $this->loadLastEdit();
 555                 }
 556                 return wfTimestamp(TS_MW, $this->mTimestamp);
 557         }
 558
 559         function getUser() {
 560                 $this->loadLastEdit();
 561                 return $this->mUser;
 562         }
 563
 564         function getUserText() {
 565                 $this->loadLastEdit();
 566                 return $this->mUserText;
 567         }
 568
 569         function getComment() {
 570                 $this->loadLastEdit();
 571                 return $this->mComment;
 572         }
 573
 574         function getMinorEdit() {
 575                 $this->loadLastEdit();
 576                 return $this->mMinorEdit;
 577         }
 578
 579         function getRevIdFetched() {
 580                 $this->loadLastEdit();
 581                 return $this->mRevIdFetched;
 582         }
 583
 584         /**
 585          * @todo Document, fixme $offset never used.
 586          * @param $limit Integer: default 0.
 587          * @param $offset Integer: default 0.
 588          */
 589         function getContributors($limit = 0, $offset = 0) {
 590                 # XXX: this is expensive; cache this info somewhere.
 591
 592                 $contribs = array();
 593                 $dbr = wfGetDB( DB_SLAVE );
 594                 $revTable = $dbr->tableName( 'revision' );
 595                 $userTable = $dbr->tableName( 'user' );
 596                 $user = $this->getUser();
 597                 $pageId = $this->getId();
 598
 599                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 600                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 601                         WHERE rev_page = $pageId
 602                         AND rev_user != $user
 603                         GROUP BY rev_user, rev_user_text, user_real_name
 604                         ORDER BY timestamp DESC";
 605
 606                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 607                 $sql .= ' '. $this->getSelectOptions();
 608
 609                 $res = $dbr->query($sql, __METHOD__);
 610
 611                 while ( $line = $dbr->fetchObject( $res ) ) {
 612                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 613                 }
 614
 615                 $dbr->freeResult($res);
 616                 return $contribs;
 617         }
 618
 619         /**
 620          * This is the default action of the script: just view the page of
 621          * the given title.
 622         */
 623         function view() {
 624                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 625                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 626                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 627                 $sk = $wgUser->getSkin();
 628
 629                 wfProfileIn( __METHOD__ );
 630
 631                 $parserCache =& ParserCache::singleton();
 632                 $ns = $this->mTitle->getNamespace(); # shortcut
 633
 634                 # Get variables from query string
 635                 $oldid = $this->getOldID();
 636
 637                 # getOldID may want us to redirect somewhere else
 638                 if ( $this->mRedirectUrl ) {
 639                         $wgOut->redirect( $this->mRedirectUrl );
 640                         wfProfileOut( __METHOD__ );
 641                         return;
 642                 }
 643
 644                 $diff = $wgRequest->getVal( 'diff' );
 645                 $rcid = $wgRequest->getVal( 'rcid' );
 646                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 647                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 648
 649                 $wgOut->setArticleFlag( true );
 650
 651                 # Discourage indexing of printable versions, but encourage following
 652                 if( $wgOut->isPrintable() ) {
 653                         $policy = 'noindex,follow';
 654                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 655                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 656                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 657                         # Honour customised robot policies for this namespace
 658                         $policy = $wgNamespaceRobotPolicies[$ns];
 659                 } else {
 660                         # Default to encourage indexing and following links
 661                         $policy = 'index,follow';
 662                 }
 663                 $wgOut->setRobotPolicy( $policy );
 664
 665                 # If we got diff and oldid in the query, we want to see a
 666                 # diff page instead of the article.
 667
 668                 if ( !is_null( $diff ) ) {
 669                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 670
 671                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 672                         // DifferenceEngine directly fetched the revision:
 673                         $this->mRevIdFetched = $de->mNewid;
 674                         $de->showDiffPage( $diffOnly );
 675
 676                         // Needed to get the page's current revision
 677                         $this->loadPageData();
 678                         if( $diff == 0 || $diff == $this->mLatest ) {
 679                                 # Run view updates for current revision only
 680                                 $this->viewUpdates();
 681                         }
 682                         wfProfileOut( __METHOD__ );
 683                         return;
 684                 }
 685
 686                 if ( empty( $oldid ) && $this->checkTouched() ) {
 687                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 688
 689                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 690                                 wfProfileOut( __METHOD__ );
 691                                 return;
 692                         } else if ( $this->tryFileCache() ) {
 693                                 # tell wgOut that output is taken care of
 694                                 $wgOut->disable();
 695                                 $this->viewUpdates();
 696                                 wfProfileOut( __METHOD__ );
 697                                 return;
 698                         }
 699                 }
 700
 701                 # Should the parser cache be used?
 702                 $pcache = $wgEnableParserCache
 703                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 704                         && $this->exists()
 705                         && empty( $oldid )
 706                         && !$this->mTitle->isCssOrJsPage()
 707                         && !$this->mTitle->isCssJsSubpage();
 708                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 709                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 710                         wfIncrStats( 'pcache_miss_stub' );
 711                 }
 712
 713                 $wasRedirected = false;
 714                 if ( isset( $this->mRedirectedFrom ) ) {
 715                         // This is an internally redirected page view.
 716                         // We'll need a backlink to the source page for navigation.
 717                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 718                                 $sk = $wgUser->getSkin();
 719                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 720                                 $s = wfMsg( 'redirectedfrom', $redir );
 721                                 $wgOut->setSubtitle( $s );
 722
 723                                 // Set the fragment if one was specified in the redirect
 724                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 725                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 726                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 727                                 }
 728                                 $wasRedirected = true;
 729                         }
 730                 } elseif ( !empty( $rdfrom ) ) {
 731                         // This is an externally redirected view, from some other wiki.
 732                         // If it was reported from a trusted site, supply a backlink.
 733                         global $wgRedirectSources;
 734                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 735                                 $sk = $wgUser->getSkin();
 736                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 737                                 $s = wfMsg( 'redirectedfrom', $redir );
 738                                 $wgOut->setSubtitle( $s );
 739                                 $wasRedirected = true;
 740                         }
 741                 }
 742
 743                 $outputDone = false;
 744                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 745                 if ( $pcache ) {
 746                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 747                                 // Ensure that UI elements requiring revision ID have
 748                                 // the correct version information.
 749                                 $wgOut->setRevisionId( $this->mLatest );
 750                                 $outputDone = true;
 751                         }
 752                 }
 753                 if ( !$outputDone ) {
 754                         $text = $this->getContent();
 755                         if ( $text === false ) {
 756                                 # Failed to load, replace text with error message
 757                                 $t = $this->mTitle->getPrefixedText();
 758                                 if( $oldid ) {
 759                                         $t .= ',oldid='.$oldid;
 760                                         $text = wfMsg( 'missingarticle', $t );
 761                                 } else {
 762                                         $text = wfMsg( 'noarticletext', $t );
 763                                 }
 764                         }
 765
 766                         # Another whitelist check in case oldid is altering the title
 767                         if ( !$this->mTitle->userCanRead() ) {
 768                                 $wgOut->loginToUse();
 769                                 $wgOut->output();
 770                                 exit;
 771                         }
 772
 773                         # We're looking at an old revision
 774
 775                         if ( !empty( $oldid ) ) {
 776                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 777                                 if( is_null( $this->mRevision ) ) {
 778                                         // FIXME: This would be a nice place to load the 'no such page' text.
 779                                 } else {
 780                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 781                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 782                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 783                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 784                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 785                                                         return;
 786                                                 } else {
 787                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 788                                                         // and we are allowed to see...
 789                                                 }
 790                                         }
 791                                 }
 792
 793                         }
 794                 }
 795                 if( !$outputDone ) {
 796                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 797
 798                          // Pages containing custom CSS or JavaScript get special treatment
 799                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 800                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 801
 802                                 // Give hooks a chance to customise the output
 803                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 804                                         // Wrap the whole lot in a <pre> and don't parse
 805                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 806                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 807                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 808                                         $wgOut->addHtml( "\n</pre>\n" );
 809                                 }
 810
 811                         }
 812
 813                         elseif ( $rt = Title::newFromRedirect( $text ) ) {
 814                                 # Display redirect
 815                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 816                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 817                                 # Don't overwrite the subtitle if this was an old revision
 818                                 if( !$wasRedirected && $this->isCurrent() ) {
 819                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 820                                 }
 821                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 822
 823                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 824                                   '<span class="redirectText">'.$link.'</span>' );
 825
 826                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 827                                 $wgOut->addParserOutputNoText( $parseout );
 828                         } else if ( $pcache ) {
 829                                 # Display content and save to parser cache
 830                                 $this->outputWikiText( $text );
 831                         } else {
 832                                 # Display content, don't attempt to save to parser cache
 833                                 # Don't show section-edit links on old revisions... this way lies madness.
 834                                 if( !$this->isCurrent() ) {
 835                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 836                                 }
 837                                 # Display content and don't save to parser cache
 838                                 # With timing hack -- TS 2006-07-26
 839                                 $time = -wfTime();
 840                                 $this->outputWikiText( $text, false );
 841                                 $time += wfTime();
 842
 843                                 # Timing hack
 844                                 if ( $time > 3 ) {
 845                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 846                                                 $this->mTitle->getPrefixedDBkey()));
 847                                 }
 848
 849                                 if( !$this->isCurrent() ) {
 850                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 851                                 }
 852
 853                         }
 854                 }
 855                 /* title may have been set from the cache */
 856                 $t = $wgOut->getPageTitle();
 857                 if( empty( $t ) ) {
 858                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 859                 }
 860
 861                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 862                 if( $ns == NS_USER_TALK &&
 863                         User::isIP( $this->mTitle->getText() ) ) {
 864                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 865                 }
 866
 867                 # If we have been passed an &rcid= parameter, we want to give the user a
 868                 # chance to mark this new article as patrolled.
 869                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 870                         $wgOut->addHTML(
 871                                 "<div class='patrollink'>" .
 872                                         wfMsgHtml( 'markaspatrolledlink',
 873                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 874                                                 "action=markpatrolled&rcid=$rcid" )
 875                                         ) .
 876                                 '</div>'
 877                          );
 878                 }
 879
 880                 # Trackbacks
 881                 if ($wgUseTrackbacks)
 882                         $this->addTrackbacks();
 883
 884                 $this->viewUpdates();
 885                 wfProfileOut( __METHOD__ );
 886         }
 887
 888         function addTrackbacks() {
 889                 global $wgOut, $wgUser;
 890
 891                 $dbr = wfGetDB(DB_SLAVE);
 892                 $tbs = $dbr->select(
 893                                 /* FROM   */ 'trackbacks',
 894                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 895                                 /* WHERE  */ array('tb_page' => $this->getID())
 896                 );
 897
 898                 if (!$dbr->numrows($tbs))
 899                         return;
 900
 901                 $tbtext = "";
 902                 while ($o = $dbr->fetchObject($tbs)) {
 903                         $rmvtxt = "";
 904                         if ($wgUser->isAllowed( 'trackback' )) {
 905                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 906                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 907                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 908                         }
 909                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 910                                         $o->tb_title,
 911                                         $o->tb_url,
 912                                         $o->tb_ex,
 913                                         $o->tb_name,
 914                                         $rmvtxt);
 915                 }
 916                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 917         }
 918
 919         function deletetrackback() {
 920                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 921
 922                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 923                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 924                         return;
 925                 }
 926
 927                 if ((!$wgUser->isAllowed('delete'))) {
 928                         $wgOut->permissionRequired( 'delete' );
 929                         return;
 930                 }
 931
 932                 if (wfReadOnly()) {
 933                         $wgOut->readOnlyPage();
 934                         return;
 935                 }
 936
 937                 $db = wfGetDB(DB_MASTER);
 938                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 939                 $wgTitle->invalidateCache();
 940                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 941         }
 942
 943         function render() {
 944                 global $wgOut;
 945
 946                 $wgOut->setArticleBodyOnly(true);
 947                 $this->view();
 948         }
 949
 950         /**
 951          * Handle action=purge
 952          */
 953         function purge() {
 954                 global $wgUser, $wgRequest, $wgOut;
 955
 956                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 957                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 958                                 $this->doPurge();
 959                         }
 960                 } else {
 961                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 962                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 963                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 964                         $msg = str_replace( '$1',
 965                                 "<form method=\"post\" action=\"$action\">\n" .
 966                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 967                                 "</form>\n", $msg );
 968
 969                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 970                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 971                         $wgOut->addHTML( $msg );
 972                 }
 973         }
 974
 975         /**
 976          * Perform the actions of a page purging
 977          */
 978         function doPurge() {
 979                 global $wgUseSquid;
 980                 // Invalidate the cache
 981                 $this->mTitle->invalidateCache();
 982
 983                 if ( $wgUseSquid ) {
 984                         // Commit the transaction before the purge is sent
 985                         $dbw = wfGetDB( DB_MASTER );
 986                         $dbw->immediateCommit();
 987
 988                         // Send purge
 989                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 990                         $update->doUpdate();
 991                 }
 992                 $this->view();
 993         }
 994
 995         /**
 996          * Insert a new empty page record for this article.
 997          * This *must* be followed up by creating a revision
 998          * and running $this->updateToLatest( $rev_id );
 999          * or else the record will be left in a funky state.
1000          * Best if all done inside a transaction.
1001          *
1002          * @param Database $dbw
1003          * @return int     The newly created page_id key
1004          * @private
1005          */
1006         function insertOn( $dbw ) {
1007                 wfProfileIn( __METHOD__ );
1008
1009                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1010                 $dbw->insert( 'page', array(
1011                         'page_id'           => $page_id,
1012                         'page_namespace'    => $this->mTitle->getNamespace(),
1013                         'page_title'        => $this->mTitle->getDBkey(),
1014                         'page_counter'      => 0,
1015                         'page_restrictions' => '',
1016                         'page_is_redirect'  => 0, # Will set this shortly...
1017                         'page_is_new'       => 1,
1018                         'page_random'       => wfRandom(),
1019                         'page_touched'      => $dbw->timestamp(),
1020                         'page_latest'       => 0, # Fill this in shortly...
1021                         'page_len'          => 0, # Fill this in shortly...
1022                 ), __METHOD__ );
1023                 $newid = $dbw->insertId();
1024
1025                 $this->mTitle->resetArticleId( $newid );
1026
1027                 wfProfileOut( __METHOD__ );
1028                 return $newid;
1029         }
1030
1031         /**
1032          * Update the page record to point to a newly saved revision.
1033          *
1034          * @param Database $dbw
1035          * @param Revision $revision For ID number, and text used to set
1036                                      length and redirect status fields
1037          * @param int $lastRevision If given, will not overwrite the page field
1038          *                          when different from the currently set value.
1039          *                          Giving 0 indicates the new page flag should
1040          *                          be set on.
1041          * @param bool $lastRevIsRedirect If given, will optimize adding and
1042          *                                                      removing rows in redirect table.
1043          * @return bool true on success, false on failure
1044          * @private
1045          */
1046         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1047                 wfProfileIn( __METHOD__ );
1048
1049                 $text = $revision->getText();
1050                 $rt = Title::newFromRedirect( $text );
1051
1052                 $conditions = array( 'page_id' => $this->getId() );
1053                 if( !is_null( $lastRevision ) ) {
1054                         # An extra check against threads stepping on each other
1055                         $conditions['page_latest'] = $lastRevision;
1056                 }
1057
1058                 $dbw->update( 'page',
1059                         array( /* SET */
1060                                 'page_latest'      => $revision->getId(),
1061                                 'page_touched'     => $dbw->timestamp(),
1062                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1063                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1064                                 'page_len'         => strlen( $text ),
1065                         ),
1066                         $conditions,
1067                         __METHOD__ );
1068
1069                 $result = $dbw->affectedRows() != 0;
1070
1071                 if ($result) {
1072                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1073                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1074                 }
1075
1076                 wfProfileOut( __METHOD__ );
1077                 return $result;
1078         }
1079
1080         /**
1081          * Add row to the redirect table if this is a redirect, remove otherwise.
1082          *
1083          * @param Database $dbw
1084          * @param $redirectTitle a title object pointing to the redirect target,
1085          *                                                      or NULL if this is not a redirect
1086          * @param bool $lastRevIsRedirect If given, will optimize adding and
1087          *                                                      removing rows in redirect table.
1088          * @return bool true on success, false on failure
1089          * @private
1090          */
1091         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1092
1093                 // Always update redirects (target link might have changed)
1094                 // Update/Insert if we don't know if the last revision was a redirect or not
1095                 // Delete if changing from redirect to non-redirect
1096                 $isRedirect = !is_null($redirectTitle);
1097                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1098
1099                         wfProfileIn( __METHOD__ );
1100
1101                         if ($isRedirect) {
1102
1103                                 // This title is a redirect, Add/Update row in the redirect table
1104                                 $set = array( /* SET */
1105                                         'rd_namespace' => $redirectTitle->getNamespace(),
1106                                         'rd_title'     => $redirectTitle->getDBkey(),
1107                                         'rd_from'      => $this->getId(),
1108                                 );
1109
1110                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1111                         } else {
1112                                 // This is not a redirect, remove row from redirect table
1113                                 $where = array( 'rd_from' => $this->getId() );
1114                                 $dbw->delete( 'redirect', $where, __METHOD__);
1115                         }
1116
1117                         wfProfileOut( __METHOD__ );
1118                         return ( $dbw->affectedRows() != 0 );
1119                 }
1120
1121                 return true;
1122         }
1123
1124         /**
1125          * If the given revision is newer than the currently set page_latest,
1126          * update the page record. Otherwise, do nothing.
1127          *
1128          * @param Database $dbw
1129          * @param Revision $revision
1130          */
1131         function updateIfNewerOn( &$dbw, $revision ) {
1132                 wfProfileIn( __METHOD__ );
1133
1134                 $row = $dbw->selectRow(
1135                         array( 'revision', 'page' ),
1136                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1137                         array(
1138                                 'page_id' => $this->getId(),
1139                                 'page_latest=rev_id' ),
1140                         __METHOD__ );
1141                 if( $row ) {
1142                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1143                                 wfProfileOut( __METHOD__ );
1144                                 return false;
1145                         }
1146                         $prev = $row->rev_id;
1147                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1148                 } else {
1149                         # No or missing previous revision; mark the page as new
1150                         $prev = 0;
1151                         $lastRevIsRedirect = null;
1152                 }
1153
1154                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1155                 wfProfileOut( __METHOD__ );
1156                 return $ret;
1157         }
1158
1159         /**
1160          * @return string Complete article text, or null if error
1161          */
1162         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1163                 wfProfileIn( __METHOD__ );
1164
1165                 if( $section == '' ) {
1166                         // Whole-page edit; let the text through unmolested.
1167                 } else {
1168                         if( is_null( $edittime ) ) {
1169                                 $rev = Revision::newFromTitle( $this->mTitle );
1170                         } else {
1171                                 $dbw = wfGetDB( DB_MASTER );
1172                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1173                         }
1174                         if( is_null( $rev ) ) {
1175                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1176                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1177                                 return null;
1178                         }
1179                         $oldtext = $rev->getText();
1180
1181                         if( $section == 'new' ) {
1182                                 # Inserting a new section
1183                                 $subject = $summary ? "== {$summary} ==\n\n" : '';
1184                                 $text = strlen( trim( $oldtext ) ) > 0
1185                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1186                                                 : "{$subject}{$text}";
1187                         } else {
1188                                 # Replacing an existing section; roll out the big guns
1189                                 global $wgParser;
1190                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1191                         }
1192
1193                 }
1194
1195                 wfProfileOut( __METHOD__ );
1196                 return $text;
1197         }
1198
1199         /**
1200          * @deprecated use Article::doEdit()
1201          */
1202         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1203                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1204                         ( $isminor ? EDIT_MINOR : 0 ) |
1205                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1206
1207                 # If this is a comment, add the summary as headline
1208                 if ( $comment && $summary != "" ) {
1209                         $text = "== {$summary} ==\n\n".$text;
1210                 }
1211
1212                 $this->doEdit( $text, $summary, $flags );
1213
1214                 $dbw = wfGetDB( DB_MASTER );
1215                 if ($watchthis) {
1216                         if (!$this->mTitle->userIsWatching()) {
1217                                 $dbw->begin();
1218                                 $this->doWatch();
1219                                 $dbw->commit();
1220                         }
1221                 } else {
1222                         if ( $this->mTitle->userIsWatching() ) {
1223                                 $dbw->begin();
1224                                 $this->doUnwatch();
1225                                 $dbw->commit();
1226                         }
1227                 }
1228                 $this->doRedirect( $this->isRedirect( $text ) );
1229         }
1230
1231         /**
1232          * @deprecated use Article::doEdit()
1233          */
1234         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1235                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1236                         ( $minor ? EDIT_MINOR : 0 ) |
1237                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1238
1239                 $good = $this->doEdit( $text, $summary, $flags );
1240                 if ( $good ) {
1241                         $dbw = wfGetDB( DB_MASTER );
1242                         if ($watchthis) {
1243                                 if (!$this->mTitle->userIsWatching()) {
1244                                         $dbw->begin();
1245                                         $this->doWatch();
1246                                         $dbw->commit();
1247                                 }
1248                         } else {
1249                                 if ( $this->mTitle->userIsWatching() ) {
1250                                         $dbw->begin();
1251                                         $this->doUnwatch();
1252                                         $dbw->commit();
1253                                 }
1254                         }
1255
1256                         $extraq = ''; // Give extensions a chance to modify URL query on update
1257                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraq ) );
1258
1259                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraq );
1260                 }
1261                 return $good;
1262         }
1263
1264         /**
1265          * Article::doEdit()
1266          *
1267          * Change an existing article or create a new article. Updates RC and all necessary caches,
1268          * optionally via the deferred update array.
1269          *
1270          * $wgUser must be set before calling this function.
1271          *
1272          * @param string $text New text
1273          * @param string $summary Edit summary
1274          * @param integer $flags bitfield:
1275          *      EDIT_NEW
1276          *          Article is known or assumed to be non-existent, create a new one
1277          *      EDIT_UPDATE
1278          *          Article is known or assumed to be pre-existing, update it
1279          *      EDIT_MINOR
1280          *          Mark this edit minor, if the user is allowed to do so
1281          *      EDIT_SUPPRESS_RC
1282          *          Do not log the change in recentchanges
1283          *      EDIT_FORCE_BOT
1284          *          Mark the edit a "bot" edit regardless of user rights
1285          *      EDIT_DEFER_UPDATES
1286          *          Defer some of the updates until the end of index.php
1287          *      EDIT_AUTOSUMMARY
1288          *          Fill in blank summaries with generated text where possible
1289          *
1290          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1291          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1292          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1293          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1294          * to MediaWiki's performance-optimised locking strategy.
1295          *
1296          * @return bool success
1297          */
1298         function doEdit( $text, $summary, $flags = 0 ) {
1299                 global $wgUser, $wgDBtransactions;
1300
1301                 wfProfileIn( __METHOD__ );
1302                 $good = true;
1303
1304                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1305                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1306                         if ( $aid ) {
1307                                 $flags |= EDIT_UPDATE;
1308                         } else {
1309                                 $flags |= EDIT_NEW;
1310                         }
1311                 }
1312
1313                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1314                         &$summary, $flags & EDIT_MINOR,
1315                         null, null, &$flags ) ) )
1316                 {
1317                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1318                         wfProfileOut( __METHOD__ );
1319                         return false;
1320                 }
1321
1322                 # Silently ignore EDIT_MINOR if not allowed
1323                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1324                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1325
1326                 $oldtext = $this->getContent();
1327                 $oldsize = strlen( $oldtext );
1328
1329                 # Provide autosummaries if one is not provided.
1330                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1331                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1332
1333                 $text = $this->preSaveTransform( $text );
1334                 $newsize = strlen( $text );
1335
1336                 $dbw = wfGetDB( DB_MASTER );
1337                 $now = wfTimestampNow();
1338
1339                 if ( $flags & EDIT_UPDATE ) {
1340                         # Update article, but only if changed.
1341
1342                         # Make sure the revision is either completely inserted or not inserted at all
1343                         if( !$wgDBtransactions ) {
1344                                 $userAbort = ignore_user_abort( true );
1345                         }
1346
1347                         $lastRevision = 0;
1348                         $revisionId = 0;
1349
1350                         if ( 0 != strcmp( $text, $oldtext ) ) {
1351                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1352                                   - (int)$this->isCountable( $oldtext );
1353                                 $this->mTotalAdjustment = 0;
1354
1355                                 $lastRevision = $dbw->selectField(
1356                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1357
1358                                 if ( !$lastRevision ) {
1359                                         # Article gone missing
1360                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1361                                         wfProfileOut( __METHOD__ );
1362                                         return false;
1363                                 }
1364
1365                                 $revision = new Revision( array(
1366                                         'page'       => $this->getId(),
1367                                         'comment'    => $summary,
1368                                         'minor_edit' => $isminor,
1369                                         'text'       => $text
1370                                         ) );
1371
1372                                 $dbw->begin();
1373                                 $revisionId = $revision->insertOn( $dbw );
1374
1375                                 # Update page
1376                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1377
1378                                 if( !$ok ) {
1379                                         /* Belated edit conflict! Run away!! */
1380                                         $good = false;
1381                                         $dbw->rollback();
1382                                 } else {
1383                                         # Update recentchanges
1384                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1385                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1386                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1387                                                         $revisionId );
1388
1389                                                 # Mark as patrolled if the user can do so
1390                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1391                                                         RecentChange::markPatrolled( $rcid );
1392                                                         PatrolLog::record( $rcid, true );
1393                                                 }
1394                                         }
1395                                         $wgUser->incEditCount();
1396                                         $dbw->commit();
1397                                 }
1398                         } else {
1399                                 // Keep the same revision ID, but do some updates on it
1400                                 $revisionId = $this->getRevIdFetched();
1401                                 // Update page_touched, this is usually implicit in the page update
1402                                 // Other cache updates are done in onArticleEdit()
1403                                 $this->mTitle->invalidateCache();
1404                         }
1405
1406                         if( !$wgDBtransactions ) {
1407                                 ignore_user_abort( $userAbort );
1408                         }
1409
1410                         if ( $good ) {
1411                                 # Invalidate cache of this article and all pages using this article
1412                                 # as a template. Partly deferred.
1413                                 Article::onArticleEdit( $this->mTitle );
1414
1415                                 # Update links tables, site stats, etc.
1416                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1417                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1418                         }
1419                 } else {
1420                         # Create new article
1421
1422                         # Set statistics members
1423                         # We work out if it's countable after PST to avoid counter drift
1424                         # when articles are created with {{subst:}}
1425                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1426                         $this->mTotalAdjustment = 1;
1427
1428                         $dbw->begin();
1429
1430                         # Add the page record; stake our claim on this title!
1431                         # This will fail with a database query exception if the article already exists
1432                         $newid = $this->insertOn( $dbw );
1433
1434                         # Save the revision text...
1435                         $revision = new Revision( array(
1436                                 'page'       => $newid,
1437                                 'comment'    => $summary,
1438                                 'minor_edit' => $isminor,
1439                                 'text'       => $text
1440                                 ) );
1441                         $revisionId = $revision->insertOn( $dbw );
1442
1443                         $this->mTitle->resetArticleID( $newid );
1444
1445                         # Update the page record with revision data
1446                         $this->updateRevisionOn( $dbw, $revision, 0 );
1447
1448                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1449                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1450                                   '', strlen( $text ), $revisionId );
1451                                 # Mark as patrolled if the user can
1452                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1453                                         RecentChange::markPatrolled( $rcid );
1454                                         PatrolLog::record( $rcid, true );
1455                                 }
1456                         }
1457                         $wgUser->incEditCount();
1458                         $dbw->commit();
1459
1460                         # Update links, etc.
1461                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1462
1463                         # Clear caches
1464                         Article::onArticleCreate( $this->mTitle );
1465
1466                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text, $summary,
1467                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1468                 }
1469
1470                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1471                         wfDoUpdates();
1472                 }
1473
1474                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary,
1475                         $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1476
1477                 wfProfileOut( __METHOD__ );
1478                 return $good;
1479         }
1480
1481         /**
1482          * @deprecated wrapper for doRedirect
1483          */
1484         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1485                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1486         }
1487
1488         /**
1489          * Output a redirect back to the article.
1490          * This is typically used after an edit.
1491          *
1492          * @param boolean $noRedir Add redirect=no
1493          * @param string $sectionAnchor section to redirect to, including "#"
1494          */
1495         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraq = '' ) {
1496                 global $wgOut;
1497                 if ( $noRedir ) {
1498                         $query = 'redirect=no';
1499                         if( $extraq )
1500                                 $query .= "&$query";
1501                 } else {
1502                         $query = $extraq;
1503                 }
1504                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1505         }
1506
1507         /**
1508          * Mark this particular edit as patrolled
1509          */
1510         function markpatrolled() {
1511                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1512                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1513
1514                 # Check RC patrol config. option
1515                 if( !$wgUseRCPatrol ) {
1516                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1517                         return;
1518                 }
1519
1520                 # Check permissions
1521                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1522                         $wgOut->permissionRequired( 'patrol' );
1523                         return;
1524                 }
1525
1526                 # If we haven't been given an rc_id value, we can't do anything
1527                 $rcid = $wgRequest->getVal( 'rcid' );
1528                 if( !$rcid ) {
1529                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1530                         return;
1531                 }
1532
1533                 # Handle the 'MarkPatrolled' hook
1534                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1535                         return;
1536                 }
1537
1538                 $return = SpecialPage::getTitleFor( 'Recentchanges' );
1539                 # If it's left up to us, check that the user is allowed to patrol this edit
1540                 # If the user has the "autopatrol" right, then we'll assume there are no
1541                 # other conditions stopping them doing so
1542                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1543                         $rc = RecentChange::newFromId( $rcid );
1544                         # Graceful error handling, as we've done before here...
1545                         # (If the recent change doesn't exist, then it doesn't matter whether
1546                         # the user is allowed to patrol it or not; nothing is going to happen
1547                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1548                                 # The user made this edit, and can't patrol it
1549                                 # Tell them so, and then back off
1550                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1551                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1552                                 $wgOut->returnToMain( false, $return );
1553                                 return;
1554                         }
1555                 }
1556
1557                 # Mark the edit as patrolled
1558                 RecentChange::markPatrolled( $rcid );
1559                 PatrolLog::record( $rcid );
1560                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1561
1562                 # Inform the user
1563                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1564                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1565                 $wgOut->returnToMain( false, $return );
1566         }
1567
1568         /**
1569          * User-interface handler for the "watch" action
1570          */
1571
1572         function watch() {
1573
1574                 global $wgUser, $wgOut;
1575
1576                 if ( $wgUser->isAnon() ) {
1577                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1578                         return;
1579                 }
1580                 if ( wfReadOnly() ) {
1581                         $wgOut->readOnlyPage();
1582                         return;
1583                 }
1584
1585                 if( $this->doWatch() ) {
1586                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1587                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1588
1589                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1590                         $text = wfMsg( 'addedwatchtext', $link );
1591                         $wgOut->addWikiText( $text );
1592                 }
1593
1594                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1595         }
1596
1597         /**
1598          * Add this page to $wgUser's watchlist
1599          * @return bool true on successful watch operation
1600          */
1601         function doWatch() {
1602                 global $wgUser;
1603                 if( $wgUser->isAnon() ) {
1604                         return false;
1605                 }
1606
1607                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1608                         $wgUser->addWatch( $this->mTitle );
1609
1610                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1611                 }
1612
1613                 return false;
1614         }
1615
1616         /**
1617          * User interface handler for the "unwatch" action.
1618          */
1619         function unwatch() {
1620
1621                 global $wgUser, $wgOut;
1622
1623                 if ( $wgUser->isAnon() ) {
1624                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1625                         return;
1626                 }
1627                 if ( wfReadOnly() ) {
1628                         $wgOut->readOnlyPage();
1629                         return;
1630                 }
1631
1632                 if( $this->doUnwatch() ) {
1633                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1634                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1635
1636                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1637                         $text = wfMsg( 'removedwatchtext', $link );
1638                         $wgOut->addWikiText( $text );
1639                 }
1640
1641                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1642         }
1643
1644         /**
1645          * Stop watching a page
1646          * @return bool true on successful unwatch
1647          */
1648         function doUnwatch() {
1649                 global $wgUser;
1650                 if( $wgUser->isAnon() ) {
1651                         return false;
1652                 }
1653
1654                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1655                         $wgUser->removeWatch( $this->mTitle );
1656
1657                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1658                 }
1659
1660                 return false;
1661         }
1662
1663         /**
1664          * action=protect handler
1665          */
1666         function protect() {
1667                 $form = new ProtectionForm( $this );
1668                 $form->execute();
1669         }
1670
1671         /**
1672          * action=unprotect handler (alias)
1673          */
1674         function unprotect() {
1675                 $this->protect();
1676         }
1677
1678         /**
1679          * Update the article's restriction field, and leave a log entry.
1680          *
1681          * @param array $limit set of restriction keys
1682          * @param string $reason
1683          * @return bool true on success
1684          */
1685         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1686                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1687
1688                 $id = $this->mTitle->getArticleID();
1689                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1690                         return false;
1691                 }
1692
1693                 if (!$cascade) {
1694                         $cascade = false;
1695                 }
1696
1697                 // Take this opportunity to purge out expired restrictions
1698                 Title::purgeExpiredRestrictions();
1699
1700                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1701                 # we expect a single selection, but the schema allows otherwise.
1702                 $current = array();
1703                 foreach( $wgRestrictionTypes as $action )
1704                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1705
1706                 $current = Article::flattenRestrictions( $current );
1707                 $updated = Article::flattenRestrictions( $limit );
1708
1709                 $changed = ( $current != $updated );
1710                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1711                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1712                 $protect = ( $updated != '' );
1713
1714                 # If nothing's changed, do nothing
1715                 if( $changed ) {
1716                         global $wgGroupPermissions;
1717                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1718
1719                                 $dbw = wfGetDB( DB_MASTER );
1720
1721                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1722
1723                                 $expiry_description = '';
1724                                 if ( $encodedExpiry != 'infinity' ) {
1725                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1726                                 }
1727
1728                                 # Prepare a null revision to be added to the history
1729                                 $modified = $current != '' && $protect;
1730                                 if ( $protect ) {
1731                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1732                                 } else {
1733                                         $comment_type = 'unprotectedarticle';
1734                                 }
1735                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1736
1737                                 foreach( $limit as $action => $restrictions ) {
1738                                         # Check if the group level required to edit also can protect pages
1739                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1740                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1741                                 }
1742
1743                                 $cascade_description = '';
1744                                 if ($cascade) {
1745                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1746                                 }
1747
1748                                 if( $reason )
1749                                         $comment .= ": $reason";
1750                                 if( $protect )
1751                                         $comment .= " [$updated]";
1752                                 if ( $expiry_description && $protect )
1753                                         $comment .= "$expiry_description";
1754                                 if ( $cascade )
1755                                         $comment .= "$cascade_description";
1756
1757                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1758                                 $nullRevId = $nullRevision->insertOn( $dbw );
1759
1760                                 # Update restrictions table
1761                                 foreach( $limit as $action => $restrictions ) {
1762                                         if ($restrictions != '' ) {
1763                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1764                                                         array( 'pr_page' => $id, 'pr_type' => $action
1765                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1766                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1767                                         } else {
1768                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1769                                                         'pr_type' => $action ), __METHOD__ );
1770                                         }
1771                                 }
1772
1773                                 # Update page record
1774                                 $dbw->update( 'page',
1775                                         array( /* SET */
1776                                                 'page_touched' => $dbw->timestamp(),
1777                                                 'page_restrictions' => '',
1778                                                 'page_latest' => $nullRevId
1779                                         ), array( /* WHERE */
1780                                                 'page_id' => $id
1781                                         ), 'Article::protect'
1782                                 );
1783                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1784
1785                                 # Update the protection log
1786                                 $log = new LogPage( 'protect' );
1787
1788                                 if( $protect ) {
1789                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1790                                 } else {
1791                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1792                                 }
1793
1794                         } # End hook
1795                 } # End "changed" check
1796
1797                 return true;
1798         }
1799
1800         /**
1801          * Take an array of page restrictions and flatten it to a string
1802          * suitable for insertion into the page_restrictions field.
1803          * @param array $limit
1804          * @return string
1805          * @private
1806          */
1807         function flattenRestrictions( $limit ) {
1808                 if( !is_array( $limit ) ) {
1809                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1810                 }
1811                 $bits = array();
1812                 ksort( $limit );
1813                 foreach( $limit as $action => $restrictions ) {
1814                         if( $restrictions != '' ) {
1815                                 $bits[] = "$action=$restrictions";
1816                         }
1817                 }
1818                 return implode( ':', $bits );
1819         }
1820
1821         /*
1822          * UI entry point for page deletion
1823          */
1824         function delete() {
1825                 global $wgUser, $wgOut, $wgRequest;
1826                 $confirm = $wgRequest->wasPosted() &&
1827                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1828                 $reason = $wgRequest->getText( 'wpReason' );
1829
1830                 # This code desperately needs to be totally rewritten
1831
1832                 # Check permissions
1833                 if( $wgUser->isAllowed( 'delete' ) ) {
1834                         if( $wgUser->isBlocked( !$confirm ) ) {
1835                                 $wgOut->blockedPage();
1836                                 return;
1837                         }
1838                 } else {
1839                         $wgOut->permissionRequired( 'delete' );
1840                         return;
1841                 }
1842
1843                 if( wfReadOnly() ) {
1844                         $wgOut->readOnlyPage();
1845                         return;
1846                 }
1847
1848                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1849
1850                 # Better double-check that it hasn't been deleted yet!
1851                 $dbw = wfGetDB( DB_MASTER );
1852                 $conds = $this->mTitle->pageCond();
1853                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1854                 if ( $latest === false ) {
1855                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1856                         return;
1857                 }
1858
1859                 if( $confirm ) {
1860                         $this->doDelete( $reason );
1861                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1862                                 $this->doWatch();
1863                         } elseif( $this->mTitle->userIsWatching() ) {
1864                                 $this->doUnwatch();
1865                         }
1866                         return;
1867                 }
1868
1869                 # determine whether this page has earlier revisions
1870                 # and insert a warning if it does
1871                 $maxRevisions = 20;
1872                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1873
1874                 if( count( $authors ) > 1 && !$confirm ) {
1875                         $skin=$wgUser->getSkin();
1876                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1877                 }
1878
1879                 # If a single user is responsible for all revisions, find out who they are
1880                 if ( count( $authors ) == $maxRevisions ) {
1881                         // Query bailed out, too many revisions to find out if they're all the same
1882                         $authorOfAll = false;
1883                 } else {
1884                         $authorOfAll = reset( $authors );
1885                         foreach ( $authors as $author ) {
1886                                 if ( $authorOfAll != $author ) {
1887                                         $authorOfAll = false;
1888                                         break;
1889                                 }
1890                         }
1891                 }
1892                 # Fetch article text
1893                 $rev = Revision::newFromTitle( $this->mTitle );
1894
1895                 if( !is_null( $rev ) ) {
1896                         # if this is a mini-text, we can paste part of it into the deletion reason
1897                         $text = $rev->getText();
1898
1899                         #if this is empty, an earlier revision may contain "useful" text
1900                         $blanked = false;
1901                         if( $text == '' ) {
1902                                 $prev = $rev->getPrevious();
1903                                 if( $prev ) {
1904                                         $text = $prev->getText();
1905                                         $blanked = true;
1906                                 }
1907                         }
1908
1909                         $length = strlen( $text );
1910
1911                         # this should not happen, since it is not possible to store an empty, new
1912                         # page. Let's insert a standard text in case it does, though
1913                         if( $length == 0 && $reason === '' ) {
1914                                 $reason = wfMsgForContent( 'exblank' );
1915                         }
1916
1917                         if( $reason === '' ) {
1918                                 # comment field=255, let's grep the first 150 to have some user
1919                                 # space left
1920                                 global $wgContLang;
1921                                 $text = $wgContLang->truncate( $text, 150, '...' );
1922
1923                                 # let's strip out newlines
1924                                 $text = preg_replace( "/[\n\r]/", '', $text );
1925
1926                                 if( !$blanked ) {
1927                                         if( $authorOfAll === false ) {
1928                                                 $reason = wfMsgForContent( 'excontent', $text );
1929                                         } else {
1930                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1931                                         }
1932                                 } else {
1933                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1934                                 }
1935                         }
1936                 }
1937
1938                 return $this->confirmDelete( '', $reason );
1939         }
1940
1941         /**
1942          * Get the last N authors
1943          * @param int $num Number of revisions to get
1944          * @param string $revLatest The latest rev_id, selected from the master (optional)
1945          * @return array Array of authors, duplicates not removed
1946          */
1947         function getLastNAuthors( $num, $revLatest = 0 ) {
1948                 wfProfileIn( __METHOD__ );
1949
1950                 // First try the slave
1951                 // If that doesn't have the latest revision, try the master
1952                 $continue = 2;
1953                 $db = wfGetDB( DB_SLAVE );
1954                 do {
1955                         $res = $db->select( array( 'page', 'revision' ),
1956                                 array( 'rev_id', 'rev_user_text' ),
1957                                 array(
1958                                         'page_namespace' => $this->mTitle->getNamespace(),
1959                                         'page_title' => $this->mTitle->getDBkey(),
1960                                         'rev_page = page_id'
1961                                 ), __METHOD__, $this->getSelectOptions( array(
1962                                         'ORDER BY' => 'rev_timestamp DESC',
1963                                         'LIMIT' => $num
1964                                 ) )
1965                         );
1966                         if ( !$res ) {
1967                                 wfProfileOut( __METHOD__ );
1968                                 return array();
1969                         }
1970                         $row = $db->fetchObject( $res );
1971                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1972                                 $db = wfGetDB( DB_MASTER );
1973                                 $continue--;
1974                         } else {
1975                                 $continue = 0;
1976                         }
1977                 } while ( $continue );
1978
1979                 $authors = array( $row->rev_user_text );
1980                 while ( $row = $db->fetchObject( $res ) ) {
1981                         $authors[] = $row->rev_user_text;
1982                 }
1983                 wfProfileOut( __METHOD__ );
1984                 return $authors;
1985         }
1986
1987         /**
1988          * Output deletion confirmation dialog
1989          */
1990         function confirmDelete( $par, $reason ) {
1991                 global $wgOut, $wgUser;
1992
1993                 wfDebug( "Article::confirmDelete\n" );
1994
1995                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1996                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1997                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1998                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1999
2000                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
2001
2002                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
2003                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
2004                 $token = htmlspecialchars( $wgUser->editToken() );
2005                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
2006
2007                 $wgOut->addHTML( "
2008 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
2009         <table border='0'>
2010                 <tr>
2011                         <td align='right'>
2012                                 <label for='wpReason'>{$delcom}:</label>
2013                         </td>
2014                         <td align='left'>
2015                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"1\" />
2016                         </td>
2017                 </tr>
2018                 <tr>
2019                         <td>&nbsp;</td>
2020                         <td>$watch</td>
2021                 </tr>
2022                 <tr>
2023                         <td>&nbsp;</td>
2024                         <td>
2025                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
2026                         </td>
2027                 </tr>
2028         </table>
2029         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2030 </form>\n" );
2031
2032                 $wgOut->returnToMain( false );
2033
2034                 $this->showLogExtract( $wgOut );
2035         }
2036
2037
2038         /**
2039          * Show relevant lines from the deletion log
2040          */
2041         function showLogExtract( $out ) {
2042                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2043                 $logViewer = new LogViewer(
2044                         new LogReader(
2045                                 new FauxRequest(
2046                                         array( 'page' => $this->mTitle->getPrefixedText(),
2047                                                'type' => 'delete' ) ) ) );
2048                 $logViewer->showList( $out );
2049         }
2050
2051
2052         /**
2053          * Perform a deletion and output success or failure messages
2054          */
2055         function doDelete( $reason ) {
2056                 global $wgOut, $wgUser;
2057                 wfDebug( __METHOD__."\n" );
2058
2059                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2060                         if ( $this->doDeleteArticle( $reason ) ) {
2061                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2062
2063                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2064                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2065
2066                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2067                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2068
2069                                 $wgOut->addWikiText( $text );
2070                                 $wgOut->returnToMain( false );
2071                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2072                         } else {
2073                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2074                         }
2075                 }
2076         }
2077
2078         /**
2079          * Back-end article deletion
2080          * Deletes the article with database consistency, writes logs, purges caches
2081          * Returns success
2082          */
2083         function doDeleteArticle( $reason ) {
2084                 global $wgUseSquid, $wgDeferredUpdateList;
2085                 global $wgUseTrackbacks;
2086
2087                 wfDebug( __METHOD__."\n" );
2088
2089                 $dbw = wfGetDB( DB_MASTER );
2090                 $ns = $this->mTitle->getNamespace();
2091                 $t = $this->mTitle->getDBkey();
2092                 $id = $this->mTitle->getArticleID();
2093
2094                 if ( $t == '' || $id == 0 ) {
2095                         return false;
2096                 }
2097
2098                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2099                 array_push( $wgDeferredUpdateList, $u );
2100
2101                 // For now, shunt the revision data into the archive table.
2102                 // Text is *not* removed from the text table; bulk storage
2103                 // is left intact to avoid breaking block-compression or
2104                 // immutable storage schemes.
2105                 //
2106                 // For backwards compatibility, note that some older archive
2107                 // table entries will have ar_text and ar_flags fields still.
2108                 //
2109                 // In the future, we may keep revisions and mark them with
2110                 // the rev_deleted field, which is reserved for this purpose.
2111                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2112                         array(
2113                                 'ar_namespace'  => 'page_namespace',
2114                                 'ar_title'      => 'page_title',
2115                                 'ar_comment'    => 'rev_comment',
2116                                 'ar_user'       => 'rev_user',
2117                                 'ar_user_text'  => 'rev_user_text',
2118                                 'ar_timestamp'  => 'rev_timestamp',
2119                                 'ar_minor_edit' => 'rev_minor_edit',
2120                                 'ar_rev_id'     => 'rev_id',
2121                                 'ar_text_id'    => 'rev_text_id',
2122                                 'ar_text'       => '\'\'', // Be explicit to appease
2123                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2124                                 'ar_len'                => 'rev_len',
2125                                 'ar_page_id'    => 'page_id',
2126                         ), array(
2127                                 'page_id' => $id,
2128                                 'page_id = rev_page'
2129                         ), __METHOD__
2130                 );
2131
2132                 # Delete restrictions for it
2133                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2134
2135                 # Now that it's safely backed up, delete it
2136                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2137
2138                 # If using cascading deletes, we can skip some explicit deletes
2139                 if ( !$dbw->cascadingDeletes() ) {
2140
2141                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2142
2143                         if ($wgUseTrackbacks)
2144                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2145
2146                         # Delete outgoing links
2147                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2148                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2149                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2150                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2151                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2152                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2153                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2154                 }
2155
2156                 # If using cleanup triggers, we can skip some manual deletes
2157                 if ( !$dbw->cleanupTriggers() ) {
2158
2159                         # Clean up recentchanges entries...
2160                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2161                 }
2162
2163                 # Clear caches
2164                 Article::onArticleDelete( $this->mTitle );
2165
2166                 # Log the deletion
2167                 $log = new LogPage( 'delete' );
2168                 $log->addEntry( 'delete', $this->mTitle, $reason );
2169
2170                 # Clear the cached article id so the interface doesn't act like we exist
2171                 $this->mTitle->resetArticleID( 0 );
2172                 $this->mTitle->mArticleID = 0;
2173                 return true;
2174         }
2175
2176         /**
2177          * Roll back the most recent consecutive set of edits to a page
2178          * from the same user; fails if there are no eligible edits to
2179          * roll back to, e.g. user is the sole contributor
2180          *
2181          * @param string $fromP - Name of the user whose edits to rollback.
2182          * @param string $summary - Custom summary. Set to default summary if empty.
2183          * @param string $token - Rollback token.
2184          * @param bool $bot - If true, mark all reverted edits as bot.
2185          *
2186          * @param array $resultDetails contains result-specific dict of additional values
2187          *    ALREADY_ROLLED : 'current' (rev)
2188          *    SUCCESS        : 'summary' (str), 'current' (rev), 'target' (rev)
2189          *
2190          * @return self::SUCCESS on succes, self::* on failure
2191          */
2192         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2193                 global $wgUser, $wgUseRCPatrol;
2194                 $resultDetails = null;
2195
2196                 if( $wgUser->isAllowed( 'rollback' ) ) {
2197                         if( $wgUser->isBlocked() ) {
2198                                 return self::BLOCKED;
2199                         }
2200                 } else {
2201                         return self::PERM_DENIED;
2202                 }
2203
2204                 if ( wfReadOnly() ) {
2205                         return self::READONLY;
2206                 }
2207                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2208                         return self::BAD_TOKEN;
2209
2210                 $dbw = wfGetDB( DB_MASTER );
2211
2212                 # Get the last editor
2213                 $current = Revision::newFromTitle( $this->mTitle );
2214                 if( is_null( $current ) ) {
2215                         # Something wrong... no page?
2216                         return self::BAD_TITLE;
2217                 }
2218
2219                 $from = str_replace( '_', ' ', $fromP );
2220                 if( $from != $current->getUserText() ) {
2221                         $resultDetails = array( 'current' => $current );
2222                         return self::ALREADY_ROLLED;
2223                 }
2224
2225                 # Get the last edit not by this guy
2226                 $user = intval( $current->getUser() );
2227                 $user_text = $dbw->addQuotes( $current->getUserText() );
2228                 $s = $dbw->selectRow( 'revision',
2229                         array( 'rev_id', 'rev_timestamp' ),
2230                         array(
2231                                 'rev_page' => $current->getPage(),
2232                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2233                         ), __METHOD__,
2234                         array(
2235                                 'USE INDEX' => 'page_timestamp',
2236                                 'ORDER BY'  => 'rev_timestamp DESC' )
2237                         );
2238                 if( $s === false ) {
2239                         # Something wrong
2240                         return self::ONLY_AUTHOR;
2241                 }
2242
2243                 $set = array();
2244                 if ( $bot ) {
2245                         # Mark all reverted edits as bot
2246                         $set['rc_bot'] = 1;
2247                 }
2248                 if ( $wgUseRCPatrol ) {
2249                         # Mark all reverted edits as patrolled
2250                         $set['rc_patrolled'] = 1;
2251                 }
2252
2253                 if ( $set ) {
2254                         $dbw->update( 'recentchanges', $set,
2255                                         array( /* WHERE */
2256                                                 'rc_cur_id' => $current->getPage(),
2257                                                 'rc_user_text' => $current->getUserText(),
2258                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2259                                         ), __METHOD__
2260                                 );
2261                 }
2262
2263                 # Get the edit summary
2264                 $target = Revision::newFromId( $s->rev_id );
2265                 if( empty( $summary ) )
2266                         $summary = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2267
2268                 # Save
2269                 $flags = EDIT_UPDATE | EDIT_MINOR;
2270                 if( $bot )
2271                         $flags |= EDIT_FORCE_BOT;
2272                 $this->doEdit( $target->getText(), $summary, $flags );
2273
2274                 $resultDetails = array(
2275                         'summary' => $summary,
2276                         'current' => $current,
2277                         'target' => $target,
2278                 );
2279                 return self::SUCCESS;
2280         }
2281
2282         /**
2283          * User interface for rollback operations
2284          */
2285         function rollback() {
2286                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2287
2288                 $details = null;
2289                 $result = $this->doRollback(
2290                         $wgRequest->getVal( 'from' ),
2291                         $wgRequest->getText( 'summary' ),
2292                         $wgRequest->getVal( 'token' ),
2293                         $wgRequest->getBool( 'bot' ),
2294                         $details
2295                 );
2296
2297                 switch( $result ) {
2298                         case self::BLOCKED:
2299                                 $wgOut->blockedPage();
2300                                 break;
2301                         case self::PERM_DENIED:
2302                                 $wgOut->permissionRequired( 'rollback' );
2303                                 break;
2304                         case self::READONLY:
2305                                 $wgOut->readOnlyPage( $this->getContent() );
2306                                 break;
2307                         case self::BAD_TOKEN:
2308                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2309                                 $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2310                                 break;
2311                         case self::BAD_TITLE:
2312                                 $wgOut->addHtml( wfMsg( 'notanarticle' ) );
2313                                 break;
2314                         case self::ALREADY_ROLLED:
2315                                 $current = $details['current'];
2316                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2317                                 $wgOut->addWikiText(
2318                                         wfMsg( 'alreadyrolled',
2319                                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2320                                                 htmlspecialchars( $wgRequest->getVal( 'from' ) ),
2321                                                 htmlspecialchars( $current->getUserText() )
2322                                         )
2323                                 );
2324                                 if( $current->getComment() != '' ) {
2325                                         $wgOut->addHtml( wfMsg( 'editcomment',
2326                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2327                                 }
2328                                 break;
2329                         case self::ONLY_AUTHOR:
2330                                 $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2331                                 $wgOut->addHtml( wfMsg( 'cantrollback' ) );
2332                                 break;
2333                         case self::SUCCESS:
2334                                 $current = $details['current'];
2335                                 $target = $details['target'];
2336                                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2337                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2338                                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2339                                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2340                                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2341                                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2342                                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2343                                 $wgOut->returnToMain( false, $this->mTitle );
2344                                 break;
2345                         default:
2346                                 throw new MWException( __METHOD__ . ": Unknown return value `{$retval}`" );
2347                 }
2348
2349         }
2350
2351
2352         /**
2353          * Do standard deferred updates after page view
2354          * @private
2355          */
2356         function viewUpdates() {
2357                 global $wgDeferredUpdateList;
2358
2359                 if ( 0 != $this->getID() ) {
2360                         global $wgDisableCounters;
2361                         if( !$wgDisableCounters ) {
2362                                 Article::incViewCount( $this->getID() );
2363                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2364                                 array_push( $wgDeferredUpdateList, $u );
2365                         }
2366                 }
2367
2368                 # Update newtalk / watchlist notification status
2369                 global $wgUser;
2370                 $wgUser->clearNotification( $this->mTitle );
2371         }
2372
2373         /**
2374          * Do standard deferred updates after page edit.
2375          * Update links tables, site stats, search index and message cache.
2376          * Every 1000th edit, prune the recent changes table.
2377          *
2378          * @private
2379          * @param $text New text of the article
2380          * @param $summary Edit summary
2381          * @param $minoredit Minor edit
2382          * @param $timestamp_of_pagechange Timestamp associated with the page change
2383          * @param $newid rev_id value of the new revision
2384          * @param $changed Whether or not the content actually changed
2385          */
2386         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2387                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2388
2389                 wfProfileIn( __METHOD__ );
2390
2391                 # Parse the text
2392                 $options = new ParserOptions;
2393                 $options->setTidy(true);
2394                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2395
2396                 # Save it to the parser cache
2397                 $parserCache =& ParserCache::singleton();
2398                 $parserCache->save( $poutput, $this, $wgUser );
2399
2400                 # Update the links tables
2401                 $u = new LinksUpdate( $this->mTitle, $poutput );
2402                 $u->doUpdate();
2403
2404                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2405                         wfSeedRandom();
2406                         if ( 0 == mt_rand( 0, 99 ) ) {
2407                                 # Periodically flush old entries from the recentchanges table.
2408                                 global $wgRCMaxAge;
2409
2410                                 $dbw = wfGetDB( DB_MASTER );
2411                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2412                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2413                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2414                                 $dbw->query( $sql );
2415                         }
2416                 }
2417
2418                 $id = $this->getID();
2419                 $title = $this->mTitle->getPrefixedDBkey();
2420                 $shortTitle = $this->mTitle->getDBkey();
2421
2422                 if ( 0 == $id ) {
2423                         wfProfileOut( __METHOD__ );
2424                         return;
2425                 }
2426
2427                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2428                 array_push( $wgDeferredUpdateList, $u );
2429                 $u = new SearchUpdate( $id, $title, $text );
2430                 array_push( $wgDeferredUpdateList, $u );
2431
2432                 # If this is another user's talk page, update newtalk
2433                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2434                 # load of user talk pages and piss people off, nor if it's a minor edit
2435                 # by a properly-flagged bot.
2436                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2437                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2438                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2439                                 $other = User::newFromName( $shortTitle );
2440                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2441                                         // An anonymous user
2442                                         $other = new User();
2443                                         $other->setName( $shortTitle );
2444                                 }
2445                                 if( $other ) {
2446                                         $other->setNewtalk( true );
2447                                 }
2448                         }
2449                 }
2450
2451                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2452                         $wgMessageCache->replace( $shortTitle, $text );
2453                 }
2454
2455                 wfProfileOut( __METHOD__ );
2456         }
2457
2458         /**
2459          * Perform article updates on a special page creation.
2460          *
2461          * @param Revision $rev
2462          *
2463          * @todo This is a shitty interface function. Kill it and replace the
2464          * other shitty functions like editUpdates and such so it's not needed
2465          * anymore.
2466          */
2467         function createUpdates( $rev ) {
2468                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2469                 $this->mTotalAdjustment = 1;
2470                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2471                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2472         }
2473
2474         /**
2475          * Generate the navigation links when browsing through an article revisions
2476          * It shows the information as:
2477          *   Revision as of \<date\>; view current revision
2478          *   \<- Previous version | Next Version -\>
2479          *
2480          * @private
2481          * @param string $oldid         Revision ID of this article revision
2482          */
2483         function setOldSubtitle( $oldid=0 ) {
2484                 global $wgLang, $wgOut, $wgUser;
2485
2486                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2487                                 return;
2488                 }
2489
2490                 $revision = Revision::newFromId( $oldid );
2491
2492                 $current = ( $oldid == $this->mLatest );
2493                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2494                 $sk = $wgUser->getSkin();
2495                 $lnk = $current
2496                         ? wfMsg( 'currentrevisionlink' )
2497                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2498                 $curdiff = $current
2499                         ? wfMsg( 'diff' )
2500                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2501                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2502                 $prevlink = $prev
2503                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2504                         : wfMsg( 'previousrevision' );
2505                 $prevdiff = $prev
2506                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2507                         : wfMsg( 'diff' );
2508                 $nextlink = $current
2509                         ? wfMsg( 'nextrevision' )
2510                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2511                 $nextdiff = $current
2512                         ? wfMsg( 'diff' )
2513                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2514
2515                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2516                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2517
2518                 $m = wfMsg( 'revision-info-current' );
2519                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2520                         ? 'revision-info-current'
2521                         : 'revision-info';
2522
2523                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2524                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2525                 $wgOut->setSubtitle( $r );
2526         }
2527
2528         /**
2529          * This function is called right before saving the wikitext,
2530          * so we can do things like signatures and links-in-context.
2531          *
2532          * @param string $text
2533          */
2534         function preSaveTransform( $text ) {
2535                 global $wgParser, $wgUser;
2536                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2537         }
2538
2539         /* Caching functions */
2540
2541         /**
2542          * checkLastModified returns true if it has taken care of all
2543          * output to the client that is necessary for this request.
2544          * (that is, it has sent a cached version of the page)
2545          */
2546         function tryFileCache() {
2547                 static $called = false;
2548                 if( $called ) {
2549                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2550                         return;
2551                 }
2552                 $called = true;
2553                 if($this->isFileCacheable()) {
2554                         $touched = $this->mTouched;
2555                         $cache = new HTMLFileCache( $this->mTitle );
2556                         if($cache->isFileCacheGood( $touched )) {
2557                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2558                                 $cache->loadFromFileCache();
2559                                 return true;
2560                         } else {
2561                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2562                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2563                         }
2564                 } else {
2565                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2566                 }
2567         }
2568
2569         /**
2570          * Check if the page can be cached
2571          * @return bool
2572          */
2573         function isFileCacheable() {
2574                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2575                 $action    = $wgRequest->getVal( 'action'    );
2576                 $oldid     = $wgRequest->getVal( 'oldid'     );
2577                 $diff      = $wgRequest->getVal( 'diff'      );
2578                 $redirect  = $wgRequest->getVal( 'redirect'  );
2579                 $printable = $wgRequest->getVal( 'printable' );
2580                 $page      = $wgRequest->getVal( 'page' );
2581
2582                 //check for non-standard user language; this covers uselang,
2583                 //and extensions for auto-detecting user language.
2584                 $ulang     = $wgLang->getCode();
2585                 $clang     = $wgContLang->getCode();
2586
2587                 $cacheable = $wgUseFileCache
2588                         && (!$wgShowIPinHeader)
2589                         && ($this->getID() != 0)
2590                         && ($wgUser->isAnon())
2591                         && (!$wgUser->getNewtalk())
2592                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2593                         && (empty( $action ) || $action == 'view')
2594                         && (!isset($oldid))
2595                         && (!isset($diff))
2596                         && (!isset($redirect))
2597                         && (!isset($printable))
2598                         && !isset($page)
2599                         && (!$this->mRedirectedFrom)
2600                         && ($ulang === $clang);
2601
2602                 if ( $cacheable ) {
2603                         //extension may have reason to disable file caching on some pages.
2604                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2605                 }
2606
2607                 return $cacheable;
2608         }
2609
2610         /**
2611          * Loads page_touched and returns a value indicating if it should be used
2612          *
2613          */
2614         function checkTouched() {
2615                 if( !$this->mDataLoaded ) {
2616                         $this->loadPageData();
2617                 }
2618                 return !$this->mIsRedirect;
2619         }
2620
2621         /**
2622          * Get the page_touched field
2623          */
2624         function getTouched() {
2625                 # Ensure that page data has been loaded
2626                 if( !$this->mDataLoaded ) {
2627                         $this->loadPageData();
2628                 }
2629                 return $this->mTouched;
2630         }
2631
2632         /**
2633          * Get the page_latest field
2634          */
2635         function getLatest() {
2636                 if ( !$this->mDataLoaded ) {
2637                         $this->loadPageData();
2638                 }
2639                 return $this->mLatest;
2640         }
2641
2642         /**
2643          * Edit an article without doing all that other stuff
2644          * The article must already exist; link tables etc
2645          * are not updated, caches are not flushed.
2646          *
2647          * @param string $text text submitted
2648          * @param string $comment comment submitted
2649          * @param bool $minor whereas it's a minor modification
2650          */
2651         function quickEdit( $text, $comment = '', $minor = 0 ) {
2652                 wfProfileIn( __METHOD__ );
2653
2654                 $dbw = wfGetDB( DB_MASTER );
2655                 $dbw->begin();
2656                 $revision = new Revision( array(
2657                         'page'       => $this->getId(),
2658                         'text'       => $text,
2659                         'comment'    => $comment,
2660                         'minor_edit' => $minor ? 1 : 0,
2661                         ) );
2662                 $revision->insertOn( $dbw );
2663                 $this->updateRevisionOn( $dbw, $revision );
2664                 $dbw->commit();
2665
2666                 wfProfileOut( __METHOD__ );
2667         }
2668
2669         /**
2670          * Used to increment the view counter
2671          *
2672          * @static
2673          * @param integer $id article id
2674          */
2675         function incViewCount( $id ) {
2676                 $id = intval( $id );
2677                 global $wgHitcounterUpdateFreq, $wgDBtype;
2678
2679                 $dbw = wfGetDB( DB_MASTER );
2680                 $pageTable = $dbw->tableName( 'page' );
2681                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2682                 $acchitsTable = $dbw->tableName( 'acchits' );
2683
2684                 if( $wgHitcounterUpdateFreq <= 1 ) {
2685                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2686                         return;
2687                 }
2688
2689                 # Not important enough to warrant an error page in case of failure
2690                 $oldignore = $dbw->ignoreErrors( true );
2691
2692                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2693
2694                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2695                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2696                         # Most of the time (or on SQL errors), skip row count check
2697                         $dbw->ignoreErrors( $oldignore );
2698                         return;
2699                 }
2700
2701                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2702                 $row = $dbw->fetchObject( $res );
2703                 $rown = intval( $row->n );
2704                 if( $rown >= $wgHitcounterUpdateFreq ){
2705                         wfProfileIn( 'Article::incViewCount-collect' );
2706                         $old_user_abort = ignore_user_abort( true );
2707
2708                         if ($wgDBtype == 'mysql')
2709                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2710                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2711                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2712                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2713                                 'GROUP BY hc_id');
2714                         $dbw->query("DELETE FROM $hitcounterTable");
2715                         if ($wgDBtype == 'mysql') {
2716                                 $dbw->query('UNLOCK TABLES');
2717                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2718                                         'WHERE page_id = hc_id');
2719                         }
2720                         else {
2721                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2722                                         "FROM $acchitsTable WHERE page_id = hc_id");
2723                         }
2724                         $dbw->query("DROP TABLE $acchitsTable");
2725
2726                         ignore_user_abort( $old_user_abort );
2727                         wfProfileOut( 'Article::incViewCount-collect' );
2728                 }
2729                 $dbw->ignoreErrors( $oldignore );
2730         }
2731
2732         /**#@+
2733          * The onArticle*() functions are supposed to be a kind of hooks
2734          * which should be called whenever any of the specified actions
2735          * are done.
2736          *
2737          * This is a good place to put code to clear caches, for instance.
2738          *
2739          * This is called on page move and undelete, as well as edit
2740          * @static
2741          * @param $title_obj a title object
2742          */
2743
2744         static function onArticleCreate($title) {
2745                 # The talk page isn't in the regular link tables, so we need to update manually:
2746                 if ( $title->isTalkPage() ) {
2747                         $other = $title->getSubjectPage();
2748                 } else {
2749                         $other = $title->getTalkPage();
2750                 }
2751                 $other->invalidateCache();
2752                 $other->purgeSquid();
2753
2754                 $title->touchLinks();
2755                 $title->purgeSquid();
2756         }
2757
2758         static function onArticleDelete( $title ) {
2759                 global $wgUseFileCache, $wgMessageCache;
2760
2761                 $title->touchLinks();
2762                 $title->purgeSquid();
2763
2764                 # File cache
2765                 if ( $wgUseFileCache ) {
2766                         $cm = new HTMLFileCache( $title );
2767                         @unlink( $cm->fileCacheName() );
2768                 }
2769
2770                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2771                         $wgMessageCache->replace( $title->getDBkey(), false );
2772                 }
2773         }
2774
2775         /**
2776          * Purge caches on page update etc
2777          */
2778         static function onArticleEdit( $title ) {
2779                 global $wgDeferredUpdateList, $wgUseFileCache;
2780
2781                 // Invalidate caches of articles which include this page
2782                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2783                 $wgDeferredUpdateList[] = $update;
2784
2785                 # Purge squid for this page only
2786                 $title->purgeSquid();
2787
2788                 # Clear file cache
2789                 if ( $wgUseFileCache ) {
2790                         $cm = new HTMLFileCache( $title );
2791                         @unlink( $cm->fileCacheName() );
2792                 }
2793         }
2794
2795         /**#@-*/
2796
2797         /**
2798          * Info about this page
2799          * Called for ?action=info when $wgAllowPageInfo is on.
2800          *
2801          * @public
2802          */
2803         function info() {
2804                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2805
2806                 if ( !$wgAllowPageInfo ) {
2807                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2808                         return;
2809                 }
2810
2811                 $page = $this->mTitle->getSubjectPage();
2812
2813                 $wgOut->setPagetitle( $page->getPrefixedText() );
2814                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
2815                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
2816
2817                 if( !$this->mTitle->exists() ) {
2818                         $wgOut->addHtml( '<div class="noarticletext">' );
2819                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2820                                 // This doesn't quite make sense; the user is asking for
2821                                 // information about the _page_, not the message... -- RC
2822                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
2823                         } else {
2824                                 $msg = $wgUser->isLoggedIn()
2825                                         ? 'noarticletext'
2826                                         : 'noarticletextanon';
2827                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
2828                         }
2829                         $wgOut->addHtml( '</div>' );
2830                 } else {
2831                         $dbr = wfGetDB( DB_SLAVE );
2832                         $wl_clause = array(
2833                                 'wl_title'     => $page->getDBkey(),
2834                                 'wl_namespace' => $page->getNamespace() );
2835                         $numwatchers = $dbr->selectField(
2836                                 'watchlist',
2837                                 'COUNT(*)',
2838                                 $wl_clause,
2839                                 __METHOD__,
2840                                 $this->getSelectOptions() );
2841
2842                         $pageInfo = $this->pageCountInfo( $page );
2843                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2844
2845                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2846                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2847                         if( $talkInfo ) {
2848                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2849                         }
2850                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2851                         if( $talkInfo ) {
2852                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2853                         }
2854                         $wgOut->addHTML( '</ul>' );
2855
2856                 }
2857         }
2858
2859         /**
2860          * Return the total number of edits and number of unique editors
2861          * on a given page. If page does not exist, returns false.
2862          *
2863          * @param Title $title
2864          * @return array
2865          * @private
2866          */
2867         function pageCountInfo( $title ) {
2868                 $id = $title->getArticleId();
2869                 if( $id == 0 ) {
2870                         return false;
2871                 }
2872
2873                 $dbr = wfGetDB( DB_SLAVE );
2874
2875                 $rev_clause = array( 'rev_page' => $id );
2876
2877                 $edits = $dbr->selectField(
2878                         'revision',
2879                         'COUNT(rev_page)',
2880                         $rev_clause,
2881                         __METHOD__,
2882                         $this->getSelectOptions() );
2883
2884                 $authors = $dbr->selectField(
2885                         'revision',
2886                         'COUNT(DISTINCT rev_user_text)',
2887                         $rev_clause,
2888                         __METHOD__,
2889                         $this->getSelectOptions() );
2890
2891                 return array( 'edits' => $edits, 'authors' => $authors );
2892         }
2893
2894         /**
2895          * Return a list of templates used by this article.
2896          * Uses the templatelinks table
2897          *
2898          * @return array Array of Title objects
2899          */
2900         function getUsedTemplates() {
2901                 $result = array();
2902                 $id = $this->mTitle->getArticleID();
2903                 if( $id == 0 ) {
2904                         return array();
2905                 }
2906
2907                 $dbr = wfGetDB( DB_SLAVE );
2908                 $res = $dbr->select( array( 'templatelinks' ),
2909                         array( 'tl_namespace', 'tl_title' ),
2910                         array( 'tl_from' => $id ),
2911                         'Article:getUsedTemplates' );
2912                 if ( false !== $res ) {
2913                         if ( $dbr->numRows( $res ) ) {
2914                                 while ( $row = $dbr->fetchObject( $res ) ) {
2915                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2916                                 }
2917                         }
2918                 }
2919                 $dbr->freeResult( $res );
2920                 return $result;
2921         }
2922
2923         /**
2924          * Return an auto-generated summary if the text provided is a redirect.
2925          *
2926          * @param  string $text The wikitext to check
2927          * @return string '' or an appropriate summary
2928          */
2929         public static function getRedirectAutosummary( $text ) {
2930                 $rt = Title::newFromRedirect( $text );
2931                 if( is_object( $rt ) )
2932                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2933                 else
2934                         return '';
2935         }
2936
2937         /**
2938          * Return an auto-generated summary if the new text is much shorter than
2939          * the old text.
2940          *
2941          * @param  string $oldtext The previous text of the page
2942          * @param  string $text    The submitted text of the page
2943          * @return string An appropriate autosummary, or an empty string.
2944          */
2945         public static function getBlankingAutosummary( $oldtext, $text ) {
2946                 if ($oldtext!='' && $text=='') {
2947                         return wfMsgForContent('autosumm-blank');
2948                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
2949                         #Removing more than 90% of the article
2950                         global $wgContLang;
2951                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
2952                         return wfMsgForContent('autosumm-replace', $truncatedtext);
2953                 } else {
2954                         return '';
2955                 }
2956         }
2957
2958         /**
2959         * Return an applicable autosummary if one exists for the given edit.
2960         * @param string $oldtext The previous text of the page.
2961         * @param string $newtext The submitted text of the page.
2962         * @param bitmask $flags A bitmask of flags submitted for the edit.
2963         * @return string An appropriate autosummary, or an empty string.
2964         */
2965         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2966
2967                 # This code is UGLY UGLY UGLY.
2968                 # Somebody PLEASE come up with a more elegant way to do it.
2969
2970                 #Redirect autosummaries
2971                 $summary = self::getRedirectAutosummary( $newtext );
2972
2973                 if ($summary)
2974                         return $summary;
2975
2976                 #Blanking autosummaries
2977                 if (!($flags & EDIT_NEW))
2978                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
2979
2980                 if ($summary)
2981                         return $summary;
2982
2983                 #New page autosummaries
2984                 if ($flags & EDIT_NEW && strlen($newtext)) {
2985                         #If they're making a new article, give its text, truncated, in the summary.
2986                         global $wgContLang;
2987                         $truncatedtext = $wgContLang->truncate(
2988                                 str_replace("\n", ' ', $newtext),
2989                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
2990                                 '...' );
2991                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
2992                 }
2993
2994                 if ($summary)
2995                         return $summary;
2996
2997                 return $summary;
2998         }
2999
3000         /**
3001          * Add the primary page-view wikitext to the output buffer
3002          * Saves the text into the parser cache if possible.
3003          * Updates templatelinks if it is out of date.
3004          *
3005          * @param string  $text
3006          * @param bool    $cache
3007          */
3008         public function outputWikiText( $text, $cache = true ) {
3009                 global $wgParser, $wgUser, $wgOut;
3010
3011                 $popts = $wgOut->parserOptions();
3012                 $popts->setTidy(true);
3013                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3014                         $popts, true, true, $this->getRevIdFetched() );
3015                 $popts->setTidy(false);
3016                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3017                         $parserCache =& ParserCache::singleton();
3018                         $parserCache->save( $parserOutput, $this, $wgUser );
3019                 }
3020
3021                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3022                         // templatelinks table may have become out of sync,
3023                         // especially if using variable-based transclusions.
3024                         // For paranoia, check if things have changed and if
3025                         // so apply updates to the database. This will ensure
3026                         // that cascaded protections apply as soon as the changes
3027                         // are visible.
3028
3029                         # Get templates from templatelinks
3030                         $id = $this->mTitle->getArticleID();
3031
3032                         $tlTemplates = array();
3033
3034                         $dbr = wfGetDB( DB_SLAVE );
3035                         $res = $dbr->select( array( 'templatelinks' ),
3036                                 array( 'tl_namespace', 'tl_title' ),
3037                                 array( 'tl_from' => $id ),
3038                                 'Article:getUsedTemplates' );
3039
3040                         global $wgContLang;
3041
3042                         if ( false !== $res ) {
3043                                 if ( $dbr->numRows( $res ) ) {
3044                                         while ( $row = $dbr->fetchObject( $res ) ) {
3045                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3046                                         }
3047                                 }
3048                         }
3049
3050                         # Get templates from parser output.
3051                         $poTemplates_allns = $parserOutput->getTemplates();
3052
3053                         $poTemplates = array ();
3054                         foreach ( $poTemplates_allns as $ns_templates ) {
3055                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3056                         }
3057
3058                         # Get the diff
3059                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3060
3061                         if ( count( $templates_diff ) > 0 ) {
3062                                 # Whee, link updates time.
3063                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3064
3065                                 $dbw = wfGetDb( DB_MASTER );
3066                                 $dbw->begin();
3067
3068                                 $u->doUpdate();
3069
3070                                 $dbw->commit();
3071                         }
3072                 }
3073
3074                 $wgOut->addParserOutput( $parserOutput );
3075         }
3076
3077 }