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