includes/Article.php

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