includes/Article.php

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