includes/Article.php

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