includes/Article.php

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