includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61
  62                 return $t == null ? null : new Article( $t );
  63         }
  64
  65         /**
  66          * Tell the page view functions that this view was redirected
  67          * from another page on the wiki.
  68          * @param $from Title object.
  69          */
  70         function setRedirectedFrom( $from ) {
  71                 $this->mRedirectedFrom = $from;
  72         }
  73
  74         /**
  75          * If this page is a redirect, get its target
  76          *
  77          * The target will be fetched from the redirect table if possible.
  78          * If this page doesn't have an entry there, call insertRedirect()
  79          * @return mixed Title object, or null if this page is not a redirect
  80          */
  81         public function getRedirectTarget() {
  82                 if(!$this->mTitle || !$this->mTitle->isRedirect())
  83                         return null;
  84                 if(!is_null($this->mRedirectTarget))
  85                         return $this->mRedirectTarget;
  86
  87                 # Query the redirect table
  88                 $dbr = wfGetDB(DB_SLAVE);
  89                 $res = $dbr->select('redirect',
  90                                 array('rd_namespace', 'rd_title'),
  91                                 array('rd_from' => $this->getID()),
  92                                 __METHOD__
  93                 );
  94                 $row = $dbr->fetchObject($res);
  95                 if($row)
  96                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  97
  98                 # This page doesn't have an entry in the redirect table
  99                 return $this->mRedirectTarget = $this->insertRedirect();
 100         }
 101
 102         /**
 103          * Insert an entry for this page into the redirect table.
 104          *
 105          * Don't call this function directly unless you know what you're doing.
 106          * @return Title object
 107          */
 108         public function insertRedirect() {
 109                 $retval = Title::newFromRedirect($this->getContent());
 110                 if(!$retval)
 111                         return null;
 112                 $dbw = wfGetDB(DB_MASTER);
 113                 $dbw->replace('redirect', array('rd_from'), array(
 114                                 'rd_from' => $this->getID(),
 115                                 'rd_namespace' => $retval->getNamespace(),
 116                                 'rd_title' => $retval->getDBKey()
 117                 ), __METHOD__);
 118                 return $retval;
 119         }
 120
 121         /**
 122          * Get the Title object this page redirects to
 123          *
 124          * @return mixed false, Title of in-wiki target, or string with URL
 125          */
 126         public function followRedirect() {
 127                 $text = $this->getContent();
 128                 return $this->followRedirectText( $text );
 129         }
 130
 131         /**
 132          * Get the Title object this text redirects to
 133          *
 134          * @return mixed false, Title of in-wiki target, or string with URL
 135          */
 136         public function followRedirectText( $text ) {
 137                 $rt = Title::newFromRedirect( $text );
 138                 # process if title object is valid and not special:userlogout
 139                 if( $rt ) {
 140                         if( $rt->getInterwiki() != '' ) {
 141                                 if( $rt->isLocal() ) {
 142                                         // Offsite wikis need an HTTP redirect.
 143                                         //
 144                                         // This can be hard to reverse and may produce loops,
 145                                         // so they may be disabled in the site configuration.
 146
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157
 158                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 159                                                 // rolleyes
 160                                         } else {
 161                                                 return $rt->getFullURL();
 162                                         }
 163                                 }
 164                                 return $rt;
 165                         }
 166                 }
 167                 // No or invalid redirect
 168                 return false;
 169         }
 170
 171         /**
 172          * get the title object of the article
 173          */
 174         function getTitle() {
 175                 return $this->mTitle;
 176         }
 177
 178         /**
 179           * Clear the object
 180           * @private
 181           */
 182         function clear() {
 183                 $this->mDataLoaded    = false;
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 187                 $this->mRedirectedFrom = null; # Title object if set
 188                 $this->mRedirectTarget = null; # Title object if set
 189                 $this->mUserText =
 190                 $this->mTimestamp = $this->mComment = '';
 191                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 192                 $this->mTouched = '19700101000000';
 193                 $this->mForUpdate = false;
 194                 $this->mIsRedirect = false;
 195                 $this->mRevIdFetched = 0;
 196                 $this->mRedirectUrl = false;
 197                 $this->mLatest = false;
 198                 $this->mPreparedEdit = false;
 199         }
 200
 201         /**
 202          * Note that getContent/loadContent do not follow redirects anymore.
 203          * If you need to fetch redirectable content easily, try
 204          * the shortcut in Article::followContent()
 205          * FIXME
 206          * @todo There are still side-effects in this!
 207          *        In general, you should use the Revision class, not Article,
 208          *        to fetch text for purposes other than page views.
 209          *
 210          * @return Return the text of this revision
 211         */
 212         function getContent() {
 213                 global $wgUser, $wgOut, $wgMessageCache;
 214
 215                 wfProfileIn( __METHOD__ );
 216
 217                 if ( 0 == $this->getID() ) {
 218                         wfProfileOut( __METHOD__ );
 219                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 220
 221                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 222                                 $wgMessageCache->loadAllMessages();
 223                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 224                         } else {
 225                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 226                         }
 227                         $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 228                         $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 229                         if( $pager->getNumRows() > 0 ) {
 230                                 $wgOut->addHtml( '<div id="mw-deleted-notice">' );
 231                                 $wgOut->addWikiMsg( 'deleted-notice' );
 232                                 $wgOut->addHTML(
 233                                         $loglist->beginLogEventsList() .
 234                                         $pager->getBody() .
 235                                         $loglist->endLogEventsList()
 236                                 );
 237                                 $wgOut->addHtml( '</div>' );
 238                         }
 239                         return "<div class='noarticletext'>\n$ret\n</div>";
 240                 } else {
 241                         $this->loadContent();
 242                         wfProfileOut( __METHOD__ );
 243                         return $this->mContent;
 244                 }
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         function getSection($text,$section) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * @return int The oldid of the article that is to be shown, 0 for the
 266          *             current revision
 267          */
 268         function getOldID() {
 269                 if ( is_null( $this->mOldId ) ) {
 270                         $this->mOldId = $this->getOldIDFromRequest();
 271                 }
 272                 return $this->mOldId;
 273         }
 274
 275         /**
 276          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 277          *
 278          * @return int The old id for the request
 279          */
 280         public function getOldIDFromRequest() {
 281                 global $wgRequest;
 282                 $this->mRedirectUrl = false;
 283                 $oldid = $wgRequest->getVal( 'oldid' );
 284                 if ( isset( $oldid ) ) {
 285                         $oldid = intval( $oldid );
 286                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 287                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 288                                 if ( $nextid  ) {
 289                                         $oldid = $nextid;
 290                                 } else {
 291                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 292                                 }
 293                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 294                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 295                                 if ( $previd ) {
 296                                         $oldid = $previd;
 297                                 } else {
 298                                         # TODO
 299                                 }
 300                         }
 301                         # unused:
 302                         # $lastid = $oldid;
 303                 }
 304
 305                 if ( !$oldid ) {
 306                         $oldid = 0;
 307                 }
 308                 return $oldid;
 309         }
 310
 311         /**
 312          * Load the revision (including text) into this object
 313          */
 314         function loadContent() {
 315                 if ( $this->mContentLoaded ) return;
 316
 317                 # Query variables :P
 318                 $oldid = $this->getOldID();
 319
 320                 # Pre-fill content with error message so that if something
 321                 # fails we'll have something telling us what we intended.
 322                 $this->mOldId = $oldid;
 323                 $this->fetchContent( $oldid );
 324         }
 325
 326
 327         /**
 328          * Fetch a page record with the given conditions
 329          * @param Database $dbr
 330          * @param array    $conditions
 331          * @private
 332          */
 333         function pageData( $dbr, $conditions ) {
 334                 $fields = array(
 335                                 'page_id',
 336                                 'page_namespace',
 337                                 'page_title',
 338                                 'page_restrictions',
 339                                 'page_counter',
 340                                 'page_is_redirect',
 341                                 'page_is_new',
 342                                 'page_random',
 343                                 'page_touched',
 344                                 'page_latest',
 345                                 'page_len',
 346                 );
 347                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 348                 $row = $dbr->selectRow(
 349                         'page',
 350                         $fields,
 351                         $conditions,
 352                         __METHOD__
 353                 );
 354                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 355                 return $row ;
 356         }
 357
 358         /**
 359          * @param Database $dbr
 360          * @param Title $title
 361          */
 362         function pageDataFromTitle( $dbr, $title ) {
 363                 return $this->pageData( $dbr, array(
 364                         'page_namespace' => $title->getNamespace(),
 365                         'page_title'     => $title->getDBkey() ) );
 366         }
 367
 368         /**
 369          * @param Database $dbr
 370          * @param int $id
 371          */
 372         function pageDataFromId( $dbr, $id ) {
 373                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 374         }
 375
 376         /**
 377          * Set the general counter, title etc data loaded from
 378          * some source.
 379          *
 380          * @param object $data
 381          * @private
 382          */
 383         function loadPageData( $data = 'fromdb' ) {
 384                 if ( $data === 'fromdb' ) {
 385                         $dbr = wfGetDB( DB_MASTER );
 386                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 387                 }
 388
 389                 $lc = LinkCache::singleton();
 390                 if ( $data ) {
 391                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 392
 393                         $this->mTitle->mArticleID = $data->page_id;
 394
 395                         # Old-fashioned restrictions.
 396                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 397
 398                         $this->mCounter     = $data->page_counter;
 399                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 400                         $this->mIsRedirect  = $data->page_is_redirect;
 401                         $this->mLatest      = $data->page_latest;
 402                 } else {
 403                         if ( is_object( $this->mTitle ) ) {
 404                                 $lc->addBadLinkObj( $this->mTitle );
 405                         }
 406                         $this->mTitle->mArticleID = 0;
 407                 }
 408
 409                 $this->mDataLoaded  = true;
 410         }
 411
 412         /**
 413          * Get text of an article from database
 414          * Does *NOT* follow redirects.
 415          * @param int $oldid 0 for whatever the latest revision is
 416          * @return string
 417          */
 418         function fetchContent( $oldid = 0 ) {
 419                 if ( $this->mContentLoaded ) {
 420                         return $this->mContent;
 421                 }
 422
 423                 $dbr = wfGetDB( DB_MASTER );
 424
 425                 # Pre-fill content with error message so that if something
 426                 # fails we'll have something telling us what we intended.
 427                 $t = $this->mTitle->getPrefixedText();
 428                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 429                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 430
 431                 if( $oldid ) {
 432                         $revision = Revision::newFromId( $oldid );
 433                         if( is_null( $revision ) ) {
 434                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 435                                 return false;
 436                         }
 437                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 438                         if( !$data ) {
 439                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 440                                 return false;
 441                         }
 442                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 443                         $this->loadPageData( $data );
 444                 } else {
 445                         if( !$this->mDataLoaded ) {
 446                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 447                                 if( !$data ) {
 448                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 449                                         return false;
 450                                 }
 451                                 $this->loadPageData( $data );
 452                         }
 453                         $revision = Revision::newFromId( $this->mLatest );
 454                         if( is_null( $revision ) ) {
 455                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 456                                 return false;
 457                         }
 458                 }
 459
 460                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 461                 // We should instead work with the Revision object when we need it...
 462                 $this->mContent   = $revision->revText(); // Loads if user is allowed
 463
 464                 $this->mUser      = $revision->getUser();
 465                 $this->mUserText  = $revision->getUserText();
 466                 $this->mComment   = $revision->getComment();
 467                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 468
 469                 $this->mRevIdFetched = $revision->getId();
 470                 $this->mContentLoaded = true;
 471                 $this->mRevision =& $revision;
 472
 473                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 474
 475                 return $this->mContent;
 476         }
 477
 478         /**
 479          * Read/write accessor to select FOR UPDATE
 480          *
 481          * @param $x Mixed: FIXME
 482          */
 483         function forUpdate( $x = NULL ) {
 484                 return wfSetVar( $this->mForUpdate, $x );
 485         }
 486
 487         /**
 488          * Get the database which should be used for reads
 489          *
 490          * @return Database
 491          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 492          */
 493         function getDB() {
 494                 wfDeprecated( __METHOD__ );
 495                 return wfGetDB( DB_MASTER );
 496         }
 497
 498         /**
 499          * Get options for all SELECT statements
 500          *
 501          * @param $options Array: an optional options array which'll be appended to
 502          *                       the default
 503          * @return Array: options
 504          */
 505         function getSelectOptions( $options = '' ) {
 506                 if ( $this->mForUpdate ) {
 507                         if ( is_array( $options ) ) {
 508                                 $options[] = 'FOR UPDATE';
 509                         } else {
 510                                 $options = 'FOR UPDATE';
 511                         }
 512                 }
 513                 return $options;
 514         }
 515
 516         /**
 517          * @return int Page ID
 518          */
 519         function getID() {
 520                 if( $this->mTitle ) {
 521                         return $this->mTitle->getArticleID();
 522                 } else {
 523                         return 0;
 524                 }
 525         }
 526
 527         /**
 528          * @return bool Whether or not the page exists in the database
 529          */
 530         function exists() {
 531                 return $this->getId() != 0;
 532         }
 533
 534         /**
 535          * @return int The view count for the page
 536          */
 537         function getCount() {
 538                 if ( -1 == $this->mCounter ) {
 539                         $id = $this->getID();
 540                         if ( $id == 0 ) {
 541                                 $this->mCounter = 0;
 542                         } else {
 543                                 $dbr = wfGetDB( DB_SLAVE );
 544                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 545                                         'Article::getCount', $this->getSelectOptions() );
 546                         }
 547                 }
 548                 return $this->mCounter;
 549         }
 550
 551         /**
 552          * Determine whether a page  would be suitable for being counted as an
 553          * article in the site_stats table based on the title & its content
 554          *
 555          * @param $text String: text to analyze
 556          * @return bool
 557          */
 558         function isCountable( $text ) {
 559                 global $wgUseCommaCount;
 560
 561                 $token = $wgUseCommaCount ? ',' : '[[';
 562                 return
 563                         $this->mTitle->isContentPage()
 564                         && !$this->isRedirect( $text )
 565                         && in_string( $token, $text );
 566         }
 567
 568         /**
 569          * Tests if the article text represents a redirect
 570          *
 571          * @param $text String: FIXME
 572          * @return bool
 573          */
 574         function isRedirect( $text = false ) {
 575                 if ( $text === false ) {
 576                         if ( $this->mDataLoaded )
 577                                 return $this->mIsRedirect;
 578
 579                         // Apparently loadPageData was never called
 580                         $this->loadContent();
 581                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 582                 } else {
 583                         $titleObj = Title::newFromRedirect( $text );
 584                 }
 585                 return $titleObj !== NULL;
 586         }
 587
 588         /**
 589          * Returns true if the currently-referenced revision is the current edit
 590          * to this page (and it exists).
 591          * @return bool
 592          */
 593         function isCurrent() {
 594                 # If no oldid, this is the current version.
 595                 if ($this->getOldID() == 0)
 596                         return true;
 597
 598                 return $this->exists() &&
 599                         isset( $this->mRevision ) &&
 600                         $this->mRevision->isCurrent();
 601         }
 602
 603         /**
 604          * Loads everything except the text
 605          * This isn't necessary for all uses, so it's only done if needed.
 606          * @private
 607          */
 608         function loadLastEdit() {
 609                 if ( -1 != $this->mUser )
 610                         return;
 611
 612                 # New or non-existent articles have no user information
 613                 $id = $this->getID();
 614                 if ( 0 == $id ) return;
 615
 616                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 617                 if( !is_null( $this->mLastRevision ) ) {
 618                         $this->mUser      = $this->mLastRevision->getUser();
 619                         $this->mUserText  = $this->mLastRevision->getUserText();
 620                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 621                         $this->mComment   = $this->mLastRevision->getComment();
 622                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 623                         $this->mRevIdFetched = $this->mLastRevision->getId();
 624                 }
 625         }
 626
 627         function getTimestamp() {
 628                 // Check if the field has been filled by ParserCache::get()
 629                 if ( !$this->mTimestamp ) {
 630                         $this->loadLastEdit();
 631                 }
 632                 return wfTimestamp(TS_MW, $this->mTimestamp);
 633         }
 634
 635         function getUser() {
 636                 $this->loadLastEdit();
 637                 return $this->mUser;
 638         }
 639
 640         function getUserText() {
 641                 $this->loadLastEdit();
 642                 return $this->mUserText;
 643         }
 644
 645         function getComment() {
 646                 $this->loadLastEdit();
 647                 return $this->mComment;
 648         }
 649
 650         function getMinorEdit() {
 651                 $this->loadLastEdit();
 652                 return $this->mMinorEdit;
 653         }
 654
 655         function getRevIdFetched() {
 656                 $this->loadLastEdit();
 657                 return $this->mRevIdFetched;
 658         }
 659
 660         /**
 661          * @param $limit Integer: default 0.
 662          * @param $offset Integer: default 0.
 663          */
 664         function getContributors($limit = 0, $offset = 0) {
 665                 # XXX: this is expensive; cache this info somewhere.
 666
 667                 $contribs = array();
 668                 $dbr = wfGetDB( DB_SLAVE );
 669                 $revTable = $dbr->tableName( 'revision' );
 670                 $userTable = $dbr->tableName( 'user' );
 671                 $user = $this->getUser();
 672                 $pageId = $this->getId();
 673
 674                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 675                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 676                         WHERE rev_page = $pageId
 677                         AND rev_user != $user
 678                         GROUP BY rev_user, rev_user_text, user_real_name
 679                         ORDER BY timestamp DESC";
 680
 681                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 682                 if ($offset > 0) { $sql .= ' OFFSET '.$offset; }
 683
 684                 $sql .= ' '. $this->getSelectOptions();
 685
 686                 $res = $dbr->query($sql, __METHOD__ );
 687
 688                 return new UserArrayFromResult( $res );
 689         }
 690
 691         /**
 692          * This is the default action of the script: just view the page of
 693          * the given title.
 694         */
 695         function view() {
 696                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 697                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 698                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 699                 global $wgDefaultRobotPolicy;
 700                 $sk = $wgUser->getSkin();
 701
 702                 wfProfileIn( __METHOD__ );
 703
 704                 $parserCache = ParserCache::singleton();
 705                 $ns = $this->mTitle->getNamespace(); # shortcut
 706
 707                 # Get variables from query string
 708                 $oldid = $this->getOldID();
 709
 710                 # getOldID may want us to redirect somewhere else
 711                 if ( $this->mRedirectUrl ) {
 712                         $wgOut->redirect( $this->mRedirectUrl );
 713                         wfProfileOut( __METHOD__ );
 714                         return;
 715                 }
 716
 717                 $diff = $wgRequest->getVal( 'diff' );
 718                 $rcid = $wgRequest->getVal( 'rcid' );
 719                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 720                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 721                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 722
 723                 $wgOut->setArticleFlag( true );
 724
 725                 # Discourage indexing of printable versions, but encourage following
 726                 if( $wgOut->isPrintable() ) {
 727                         $policy = 'noindex,follow';
 728                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 729                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 730                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 731                         # Honour customised robot policies for this namespace
 732                         $policy = $wgNamespaceRobotPolicies[$ns];
 733                 } else {
 734                         $policy = $wgDefaultRobotPolicy;
 735                 }
 736                 $wgOut->setRobotPolicy( $policy );
 737
 738                 # If we got diff and oldid in the query, we want to see a
 739                 # diff page instead of the article.
 740
 741                 if ( !is_null( $diff ) ) {
 742                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 743
 744                         $diff = $wgRequest->getVal( 'diff' );
 745                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 746                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 747                         // DifferenceEngine directly fetched the revision:
 748                         $this->mRevIdFetched = $de->mNewid;
 749                         $de->showDiffPage( $diffOnly );
 750
 751                         // Needed to get the page's current revision
 752                         $this->loadPageData();
 753                         if( $diff == 0 || $diff == $this->mLatest ) {
 754                                 # Run view updates for current revision only
 755                                 $this->viewUpdates();
 756                         }
 757                         wfProfileOut( __METHOD__ );
 758                         return;
 759                 }
 760
 761                 if ( empty( $oldid ) && $this->checkTouched() ) {
 762                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 763
 764                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 765                                 wfProfileOut( __METHOD__ );
 766                                 return;
 767                         } else if ( $this->tryFileCache() ) {
 768                                 # tell wgOut that output is taken care of
 769                                 $wgOut->disable();
 770                                 $this->viewUpdates();
 771                                 wfProfileOut( __METHOD__ );
 772                                 return;
 773                         }
 774                 }
 775
 776                 # Should the parser cache be used?
 777                 $pcache = $this->useParserCache( $oldid );
 778                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 779                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 780                         wfIncrStats( 'pcache_miss_stub' );
 781                 }
 782
 783                 $wasRedirected = false;
 784                 if ( isset( $this->mRedirectedFrom ) ) {
 785                         // This is an internally redirected page view.
 786                         // We'll need a backlink to the source page for navigation.
 787                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 788                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 789                                 $s = wfMsg( 'redirectedfrom', $redir );
 790                                 $wgOut->setSubtitle( $s );
 791
 792                                 // Set the fragment if one was specified in the redirect
 793                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 794                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 795                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 796                                 }
 797                                 $wasRedirected = true;
 798                         }
 799                 } elseif ( !empty( $rdfrom ) ) {
 800                         // This is an externally redirected view, from some other wiki.
 801                         // If it was reported from a trusted site, supply a backlink.
 802                         global $wgRedirectSources;
 803                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 804                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 805                                 $s = wfMsg( 'redirectedfrom', $redir );
 806                                 $wgOut->setSubtitle( $s );
 807                                 $wasRedirected = true;
 808                         }
 809                 }
 810
 811                 $outputDone = false;
 812                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 813                 if ( $pcache ) {
 814                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 815                                 // Ensure that UI elements requiring revision ID have
 816                                 // the correct version information.
 817                                 $wgOut->setRevisionId( $this->mLatest );
 818                                 $outputDone = true;
 819                         }
 820                 }
 821                 # Fetch content and check for errors
 822                 if ( !$outputDone ) {
 823                         $text = $this->getContent();
 824                         if ( $text === false ) {
 825                                 # Failed to load, replace text with error message
 826                                 $t = $this->mTitle->getPrefixedText();
 827                                 if( $oldid ) {
 828                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 829                                         $text = wfMsg( 'missing-article', $t, $d );
 830                                 } else {
 831                                         $text = wfMsg( 'noarticletext' );
 832                                 }
 833                         }
 834
 835                         # Another whitelist check in case oldid is altering the title
 836                         if ( !$this->mTitle->userCanRead() ) {
 837                                 $wgOut->loginToUse();
 838                                 $wgOut->output();
 839                                 wfProfileOut( __METHOD__ );
 840                                 exit;
 841                         }
 842
 843                         # We're looking at an old revision
 844                         if ( !empty( $oldid ) ) {
 845                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 846                                 if( is_null( $this->mRevision ) ) {
 847                                         // FIXME: This would be a nice place to load the 'no such page' text.
 848                                 } else {
 849                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 850                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 851                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 852                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 853                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 854                                                         wfProfileOut( __METHOD__ );
 855                                                         return;
 856                                                 } else {
 857                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 858                                                         // and we are allowed to see...
 859                                                 }
 860                                         }
 861                                 }
 862                         }
 863
 864                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 865
 866                          // Pages containing custom CSS or JavaScript get special treatment
 867                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 868                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 869                                 // Give hooks a chance to customise the output
 870                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 871                                         // Wrap the whole lot in a <pre> and don't parse
 872                                         $m = array();
 873                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 874                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 875                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 876                                         $wgOut->addHtml( "\n</pre>\n" );
 877                                 }
 878                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 879                                 # Don't append the subtitle if this was an old revision
 880                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 881                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 882                                 $wgOut->addParserOutputNoText( $parseout );
 883                         } else if ( $pcache ) {
 884                                 # Display content and save to parser cache
 885                                 $this->outputWikiText( $text );
 886                         } else {
 887                                 # Display content, don't attempt to save to parser cache
 888                                 # Don't show section-edit links on old revisions... this way lies madness.
 889                                 if( !$this->isCurrent() ) {
 890                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 891                                 }
 892                                 # Display content and don't save to parser cache
 893                                 # With timing hack -- TS 2006-07-26
 894                                 $time = -wfTime();
 895                                 $this->outputWikiText( $text, false );
 896                                 $time += wfTime();
 897
 898                                 # Timing hack
 899                                 if ( $time > 3 ) {
 900                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 901                                                 $this->mTitle->getPrefixedDBkey()));
 902                                 }
 903
 904                                 if( !$this->isCurrent() ) {
 905                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 906                                 }
 907                         }
 908                 }
 909                 /* title may have been set from the cache */
 910                 $t = $wgOut->getPageTitle();
 911                 if( empty( $t ) ) {
 912                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 913
 914                         # For the main page, overwrite the <title> element with the con-
 915                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 916                         # that's not empty).
 917                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 918                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 919                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 920                         }
 921                 }
 922
 923                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 924                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 925                         $wgOut->addWikiMsg('anontalkpagetext');
 926                 }
 927
 928                 # If we have been passed an &rcid= parameter, we want to give the user a
 929                 # chance to mark this new article as patrolled.
 930                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 931                         $wgOut->addHTML(
 932                                 "<div class='patrollink'>" .
 933                                         wfMsgHtml( 'markaspatrolledlink',
 934                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 935                                                 "action=markpatrolled&rcid=$rcid" )
 936                                         ) .
 937                                 '</div>'
 938                          );
 939                 }
 940
 941                 # Trackbacks
 942                 if ($wgUseTrackbacks)
 943                         $this->addTrackbacks();
 944
 945                 $this->viewUpdates();
 946                 wfProfileOut( __METHOD__ );
 947         }
 948
 949         /*
 950         * Should the parser cache be used?
 951         */
 952         protected function useParserCache( $oldid ) {
 953                 global $wgUser, $wgEnableParserCache;
 954
 955                 return $wgEnableParserCache
 956                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 957                         && $this->exists()
 958                         && empty( $oldid )
 959                         && !$this->mTitle->isCssOrJsPage()
 960                         && !$this->mTitle->isCssJsSubpage();
 961         }
 962
 963         /**
 964          * View redirect
 965          * @param Title $target Title of destination to redirect
 966          * @param Bool  $appendSubtitle Object[optional]
 967          * @param Bool  $forceKnown Should the image be shown as a bluelink regardless of existence?
 968          */
 969         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 970                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 971
 972                 # Display redirect
 973                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 974                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 975
 976                 if( $appendSubtitle ) {
 977                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 978                 }
 979                 $sk = $wgUser->getSkin();
 980                 if ( $forceKnown )
 981                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 982                 else
 983                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 984
 985                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 986                         '<span class="redirectText">'.$link.'</span>';
 987
 988         }
 989
 990         function addTrackbacks() {
 991                 global $wgOut, $wgUser;
 992
 993                 $dbr = wfGetDB(DB_SLAVE);
 994                 $tbs = $dbr->select(
 995                                 /* FROM   */ 'trackbacks',
 996                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 997                                 /* WHERE  */ array('tb_page' => $this->getID())
 998                 );
 999
1000                 if (!$dbr->numrows($tbs))
1001                         return;
1002
1003                 $tbtext = "";
1004                 while ($o = $dbr->fetchObject($tbs)) {
1005                         $rmvtxt = "";
1006                         if ($wgUser->isAllowed( 'trackback' )) {
1007                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
1008                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1009                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1010                         }
1011                         $tbtext .= "\n";
1012                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1013                                         $o->tb_title,
1014                                         $o->tb_url,
1015                                         $o->tb_ex,
1016                                         $o->tb_name,
1017                                         $rmvtxt);
1018                 }
1019                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1020         }
1021
1022         function deletetrackback() {
1023                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1024
1025                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
1026                         $wgOut->addWikiMsg( 'sessionfailure' );
1027                         return;
1028                 }
1029
1030                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1031
1032                 if (count($permission_errors)>0)
1033                 {
1034                         $wgOut->showPermissionsErrorPage( $permission_errors );
1035                         return;
1036                 }
1037
1038                 $db = wfGetDB(DB_MASTER);
1039                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1040                 $wgTitle->invalidateCache();
1041                 $wgOut->addWikiMsg('trackbackdeleteok');
1042         }
1043
1044         function render() {
1045                 global $wgOut;
1046
1047                 $wgOut->setArticleBodyOnly(true);
1048                 $this->view();
1049         }
1050
1051         /**
1052          * Handle action=purge
1053          */
1054         function purge() {
1055                 global $wgUser, $wgRequest, $wgOut;
1056
1057                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1058                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1059                                 $this->doPurge();
1060                                 $this->view();
1061                         }
1062                 } else {
1063                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1064                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1065                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1066                         $msg = str_replace( '$1',
1067                                 "<form method=\"post\" action=\"$action\">\n" .
1068                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1069                                 "</form>\n", $msg );
1070
1071                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1072                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1073                         $wgOut->addHTML( $msg );
1074                 }
1075         }
1076
1077         /**
1078          * Perform the actions of a page purging
1079          */
1080         function doPurge() {
1081                 global $wgUseSquid;
1082                 // Invalidate the cache
1083                 $this->mTitle->invalidateCache();
1084
1085                 if ( $wgUseSquid ) {
1086                         // Commit the transaction before the purge is sent
1087                         $dbw = wfGetDB( DB_MASTER );
1088                         $dbw->immediateCommit();
1089
1090                         // Send purge
1091                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1092                         $update->doUpdate();
1093                 }
1094                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1095                         global $wgMessageCache;
1096                         if ( $this->getID() == 0 ) {
1097                                 $text = false;
1098                         } else {
1099                                 $text = $this->getContent();
1100                         }
1101                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1102                 }
1103         }
1104
1105         /**
1106          * Insert a new empty page record for this article.
1107          * This *must* be followed up by creating a revision
1108          * and running $this->updateToLatest( $rev_id );
1109          * or else the record will be left in a funky state.
1110          * Best if all done inside a transaction.
1111          *
1112          * @param Database $dbw
1113          * @return int     The newly created page_id key
1114          * @private
1115          */
1116         function insertOn( $dbw ) {
1117                 wfProfileIn( __METHOD__ );
1118
1119                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1120                 $dbw->insert( 'page', array(
1121                         'page_id'           => $page_id,
1122                         'page_namespace'    => $this->mTitle->getNamespace(),
1123                         'page_title'        => $this->mTitle->getDBkey(),
1124                         'page_counter'      => 0,
1125                         'page_restrictions' => '',
1126                         'page_is_redirect'  => 0, # Will set this shortly...
1127                         'page_is_new'       => 1,
1128                         'page_random'       => wfRandom(),
1129                         'page_touched'      => $dbw->timestamp(),
1130                         'page_latest'       => 0, # Fill this in shortly...
1131                         'page_len'          => 0, # Fill this in shortly...
1132                 ), __METHOD__ );
1133                 $newid = $dbw->insertId();
1134
1135                 $this->mTitle->resetArticleId( $newid );
1136
1137                 wfProfileOut( __METHOD__ );
1138                 return $newid;
1139         }
1140
1141         /**
1142          * Update the page record to point to a newly saved revision.
1143          *
1144          * @param Database $dbw
1145          * @param Revision $revision For ID number, and text used to set
1146                                      length and redirect status fields
1147          * @param int $lastRevision If given, will not overwrite the page field
1148          *                          when different from the currently set value.
1149          *                          Giving 0 indicates the new page flag should
1150          *                          be set on.
1151          * @param bool $lastRevIsRedirect If given, will optimize adding and
1152          *                                                      removing rows in redirect table.
1153          * @return bool true on success, false on failure
1154          * @private
1155          */
1156         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1157                 wfProfileIn( __METHOD__ );
1158
1159                 $text = $revision->getText();
1160                 $rt = Title::newFromRedirect( $text );
1161
1162                 $conditions = array( 'page_id' => $this->getId() );
1163                 if( !is_null( $lastRevision ) ) {
1164                         # An extra check against threads stepping on each other
1165                         $conditions['page_latest'] = $lastRevision;
1166                 }
1167
1168                 $dbw->update( 'page',
1169                         array( /* SET */
1170                                 'page_latest'      => $revision->getId(),
1171                                 'page_touched'     => $dbw->timestamp(),
1172                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1173                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1174                                 'page_len'         => strlen( $text ),
1175                         ),
1176                         $conditions,
1177                         __METHOD__ );
1178
1179                 $result = $dbw->affectedRows() != 0;
1180
1181                 if ($result) {
1182                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1183                 }
1184
1185                 wfProfileOut( __METHOD__ );
1186                 return $result;
1187         }
1188
1189         /**
1190          * Add row to the redirect table if this is a redirect, remove otherwise.
1191          *
1192          * @param Database $dbw
1193          * @param $redirectTitle a title object pointing to the redirect target,
1194          *                                                      or NULL if this is not a redirect
1195          * @param bool $lastRevIsRedirect If given, will optimize adding and
1196          *                                                      removing rows in redirect table.
1197          * @return bool true on success, false on failure
1198          * @private
1199          */
1200         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1201
1202                 // Always update redirects (target link might have changed)
1203                 // Update/Insert if we don't know if the last revision was a redirect or not
1204                 // Delete if changing from redirect to non-redirect
1205                 $isRedirect = !is_null($redirectTitle);
1206                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1207
1208                         wfProfileIn( __METHOD__ );
1209
1210                         if ($isRedirect) {
1211
1212                                 // This title is a redirect, Add/Update row in the redirect table
1213                                 $set = array( /* SET */
1214                                         'rd_namespace' => $redirectTitle->getNamespace(),
1215                                         'rd_title'     => $redirectTitle->getDBkey(),
1216                                         'rd_from'      => $this->getId(),
1217                                 );
1218
1219                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1220                         } else {
1221                                 // This is not a redirect, remove row from redirect table
1222                                 $where = array( 'rd_from' => $this->getId() );
1223                                 $dbw->delete( 'redirect', $where, __METHOD__);
1224                         }
1225
1226                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1227                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1228                         wfProfileOut( __METHOD__ );
1229                         return ( $dbw->affectedRows() != 0 );
1230                 }
1231
1232                 return true;
1233         }
1234
1235         /**
1236          * If the given revision is newer than the currently set page_latest,
1237          * update the page record. Otherwise, do nothing.
1238          *
1239          * @param Database $dbw
1240          * @param Revision $revision
1241          */
1242         function updateIfNewerOn( &$dbw, $revision ) {
1243                 wfProfileIn( __METHOD__ );
1244
1245                 $row = $dbw->selectRow(
1246                         array( 'revision', 'page' ),
1247                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1248                         array(
1249                                 'page_id' => $this->getId(),
1250                                 'page_latest=rev_id' ),
1251                         __METHOD__ );
1252                 if( $row ) {
1253                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1254                                 wfProfileOut( __METHOD__ );
1255                                 return false;
1256                         }
1257                         $prev = $row->rev_id;
1258                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1259                 } else {
1260                         # No or missing previous revision; mark the page as new
1261                         $prev = 0;
1262                         $lastRevIsRedirect = null;
1263                 }
1264
1265                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1266                 wfProfileOut( __METHOD__ );
1267                 return $ret;
1268         }
1269
1270         /**
1271          * @return string Complete article text, or null if error
1272          */
1273         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1274                 wfProfileIn( __METHOD__ );
1275
1276                 if( $section == '' ) {
1277                         // Whole-page edit; let the text through unmolested.
1278                 } else {
1279                         if( is_null( $edittime ) ) {
1280                                 $rev = Revision::newFromTitle( $this->mTitle );
1281                         } else {
1282                                 $dbw = wfGetDB( DB_MASTER );
1283                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1284                         }
1285                         if( is_null( $rev ) ) {
1286                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1287                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1288                                 return null;
1289                         }
1290                         $oldtext = $rev->getText();
1291
1292                         if( $section == 'new' ) {
1293                                 # Inserting a new section
1294                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1295                                 $text = strlen( trim( $oldtext ) ) > 0
1296                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1297                                                 : "{$subject}{$text}";
1298                         } else {
1299                                 # Replacing an existing section; roll out the big guns
1300                                 global $wgParser;
1301                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1302                         }
1303
1304                 }
1305
1306                 wfProfileOut( __METHOD__ );
1307                 return $text;
1308         }
1309
1310         /**
1311          * @deprecated use Article::doEdit()
1312          */
1313         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1314                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1315                         ( $isminor ? EDIT_MINOR : 0 ) |
1316                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1317                         ( $bot ? EDIT_FORCE_BOT : 0 );
1318
1319                 # If this is a comment, add the summary as headline
1320                 if ( $comment && $summary != "" ) {
1321                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1322                 }
1323
1324                 $this->doEdit( $text, $summary, $flags );
1325
1326                 $dbw = wfGetDB( DB_MASTER );
1327                 if ($watchthis) {
1328                         if (!$this->mTitle->userIsWatching()) {
1329                                 $dbw->begin();
1330                                 $this->doWatch();
1331                                 $dbw->commit();
1332                         }
1333                 } else {
1334                         if ( $this->mTitle->userIsWatching() ) {
1335                                 $dbw->begin();
1336                                 $this->doUnwatch();
1337                                 $dbw->commit();
1338                         }
1339                 }
1340                 $this->doRedirect( $this->isRedirect( $text ) );
1341         }
1342
1343         /**
1344          * @deprecated use Article::doEdit()
1345          */
1346         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1347                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1348                         ( $minor ? EDIT_MINOR : 0 ) |
1349                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1350
1351                 $good = $this->doEdit( $text, $summary, $flags );
1352                 if ( $good ) {
1353                         $dbw = wfGetDB( DB_MASTER );
1354                         if ($watchthis) {
1355                                 if (!$this->mTitle->userIsWatching()) {
1356                                         $dbw->begin();
1357                                         $this->doWatch();
1358                                         $dbw->commit();
1359                                 }
1360                         } else {
1361                                 if ( $this->mTitle->userIsWatching() ) {
1362                                         $dbw->begin();
1363                                         $this->doUnwatch();
1364                                         $dbw->commit();
1365                                 }
1366                         }
1367
1368                         $extraQuery = ''; // Give extensions a chance to modify URL query on update
1369                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1370
1371                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1372                 }
1373                 return $good;
1374         }
1375
1376         /**
1377          * Article::doEdit()
1378          *
1379          * Change an existing article or create a new article. Updates RC and all necessary caches,
1380          * optionally via the deferred update array.
1381          *
1382          * $wgUser must be set before calling this function.
1383          *
1384          * @param string $text New text
1385          * @param string $summary Edit summary
1386          * @param integer $flags bitfield:
1387          *      EDIT_NEW
1388          *          Article is known or assumed to be non-existent, create a new one
1389          *      EDIT_UPDATE
1390          *          Article is known or assumed to be pre-existing, update it
1391          *      EDIT_MINOR
1392          *          Mark this edit minor, if the user is allowed to do so
1393          *      EDIT_SUPPRESS_RC
1394          *          Do not log the change in recentchanges
1395          *      EDIT_FORCE_BOT
1396          *          Mark the edit a "bot" edit regardless of user rights
1397          *      EDIT_DEFER_UPDATES
1398          *          Defer some of the updates until the end of index.php
1399          *      EDIT_AUTOSUMMARY
1400          *          Fill in blank summaries with generated text where possible
1401          *
1402          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1403          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1404          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1405          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1406          * to MediaWiki's performance-optimised locking strategy.
1407          * @param $baseRevId, the revision ID this edit was based off, if any
1408          *
1409          * @return bool success
1410          */
1411         function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1412                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1413
1414                 if ($user == null) {
1415                         $user = $wgUser;
1416                 }
1417
1418                 wfProfileIn( __METHOD__ );
1419                 $good = true;
1420
1421                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1422                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1423                         if ( $aid ) {
1424                                 $flags |= EDIT_UPDATE;
1425                         } else {
1426                                 $flags |= EDIT_NEW;
1427                         }
1428                 }
1429
1430                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text,
1431                         &$summary, $flags & EDIT_MINOR,
1432                         null, null, &$flags ) ) )
1433                 {
1434                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1435                         wfProfileOut( __METHOD__ );
1436                         return false;
1437                 }
1438
1439                 # Silently ignore EDIT_MINOR if not allowed
1440                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1441                 $bot = $flags & EDIT_FORCE_BOT;
1442
1443                 $oldtext = $this->getContent();
1444                 $oldsize = strlen( $oldtext );
1445
1446                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1447                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1448                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1449                 }
1450
1451                 $editInfo = $this->prepareTextForEdit( $text );
1452                 $text = $editInfo->pst;
1453                 $newsize = strlen( $text );
1454
1455                 $dbw = wfGetDB( DB_MASTER );
1456                 $now = wfTimestampNow();
1457
1458                 if ( $flags & EDIT_UPDATE ) {
1459                         # Update article, but only if changed.
1460
1461                         # Make sure the revision is either completely inserted or not inserted at all
1462                         if( !$wgDBtransactions ) {
1463                                 $userAbort = ignore_user_abort( true );
1464                         }
1465
1466                         $lastRevision = 0;
1467                         $revisionId = 0;
1468
1469                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1470
1471                         if ( $changed ) {
1472                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1473                                   - (int)$this->isCountable( $oldtext );
1474                                 $this->mTotalAdjustment = 0;
1475
1476                                 $lastRevision = $dbw->selectField(
1477                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1478
1479                                 if ( !$lastRevision ) {
1480                                         # Article gone missing
1481                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1482                                         wfProfileOut( __METHOD__ );
1483                                         return false;
1484                                 }
1485
1486                                 $revision = new Revision( array(
1487                                         'page'       => $this->getId(),
1488                                         'comment'    => $summary,
1489                                         'minor_edit' => $isminor,
1490                                         'text'       => $text,
1491                                         'parent_id'  => $lastRevision,
1492                                         'user'       => $user->getId(),
1493                                         'user_text'  => $user->getName(),
1494                                         ) );
1495
1496                                 $dbw->begin();
1497                                 $revisionId = $revision->insertOn( $dbw );
1498
1499                                 # Update page
1500                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1501
1502                                 if( !$ok ) {
1503                                         /* Belated edit conflict! Run away!! */
1504                                         $good = false;
1505                                         $dbw->rollback();
1506                                 } else {
1507                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId ) );
1508
1509                                         # Update recentchanges
1510                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1511                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1512                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1513                                                         $revisionId );
1514
1515                                                 # Mark as patrolled if the user can do so
1516                                                 if( $GLOBALS['wgUseRCPatrol'] && $user->isAllowed( 'autopatrol' ) ) {
1517                                                         RecentChange::markPatrolled( $rcid );
1518                                                         PatrolLog::record( $rcid, true );
1519                                                 }
1520                                         }
1521                                         $user->incEditCount();
1522                                         $dbw->commit();
1523                                 }
1524                         } else {
1525                                 $revision = null;
1526                                 // Keep the same revision ID, but do some updates on it
1527                                 $revisionId = $this->getRevIdFetched();
1528                                 // Update page_touched, this is usually implicit in the page update
1529                                 // Other cache updates are done in onArticleEdit()
1530                                 $this->mTitle->invalidateCache();
1531                         }
1532
1533                         if( !$wgDBtransactions ) {
1534                                 ignore_user_abort( $userAbort );
1535                         }
1536
1537                         if ( $good ) {
1538                                 # Invalidate cache of this article and all pages using this article
1539                                 # as a template. Partly deferred.
1540                                 Article::onArticleEdit( $this->mTitle );
1541
1542                                 # Update links tables, site stats, etc.
1543                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1544                         }
1545                 } else {
1546                         # Create new article
1547
1548                         # Set statistics members
1549                         # We work out if it's countable after PST to avoid counter drift
1550                         # when articles are created with {{subst:}}
1551                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1552                         $this->mTotalAdjustment = 1;
1553
1554                         $dbw->begin();
1555
1556                         # Add the page record; stake our claim on this title!
1557                         # This will fail with a database query exception if the article already exists
1558                         $newid = $this->insertOn( $dbw );
1559
1560                         # Save the revision text...
1561                         $revision = new Revision( array(
1562                                 'page'       => $newid,
1563                                 'comment'    => $summary,
1564                                 'minor_edit' => $isminor,
1565                                 'text'       => $text
1566                                 ) );
1567                         $revisionId = $revision->insertOn( $dbw );
1568
1569                         $this->mTitle->resetArticleID( $newid );
1570
1571                         # Update the page record with revision data
1572                         $this->updateRevisionOn( $dbw, $revision, 0 );
1573
1574                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
1575
1576                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1577                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1578                                   '', strlen( $text ), $revisionId );
1579                                 # Mark as patrolled if the user can
1580                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $user->isAllowed( 'autopatrol' ) ) {
1581                                         RecentChange::markPatrolled( $rcid );
1582                                         PatrolLog::record( $rcid, true );
1583                                 }
1584                         }
1585                         $user->incEditCount();
1586                         $dbw->commit();
1587
1588                         # Update links, etc.
1589                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1590
1591                         # Clear caches
1592                         Article::onArticleCreate( $this->mTitle );
1593
1594                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1595                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1596                 }
1597
1598                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1599                         wfDoUpdates();
1600                 }
1601
1602                 if ( $good ) {
1603                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1604                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1605                 }
1606
1607                 wfProfileOut( __METHOD__ );
1608                 return $good;
1609         }
1610
1611         /**
1612          * @deprecated wrapper for doRedirect
1613          */
1614         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1615                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1616         }
1617
1618         /**
1619          * Output a redirect back to the article.
1620          * This is typically used after an edit.
1621          *
1622          * @param boolean $noRedir Add redirect=no
1623          * @param string $sectionAnchor section to redirect to, including "#"
1624          * @param string $extraQuery, extra query params
1625          */
1626         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1627                 global $wgOut;
1628                 if ( $noRedir ) {
1629                         $query = 'redirect=no';
1630                         if( $extraQuery )
1631                                 $query .= "&$query";
1632                 } else {
1633                         $query = $extraQuery;
1634                 }
1635                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1636         }
1637
1638         /**
1639          * Mark this particular edit/page as patrolled
1640          */
1641         function markpatrolled() {
1642                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1643                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1644
1645                 # If we haven't been given an rc_id value, we can't do anything
1646                 $rcid = (int) $wgRequest->getVal('rcid');
1647                 $rc = RecentChange::newFromId($rcid);
1648                 if (is_null($rc))
1649                 {
1650                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1651                         return;
1652                 }
1653
1654                 #It would be nice to see where the user had actually come from, but for now just guess
1655                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1656                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1657
1658                 $errors = $rc->doMarkPatrolled();
1659                 if (in_array(array('rcpatroldisabled'), $errors)) {
1660                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1661                         return;
1662                 }
1663
1664                 if (in_array(array('hookaborted'), $errors)) {
1665                         // The hook itself has handled any output
1666                         return;
1667                 }
1668
1669                 if (in_array(array('markedaspatrollederror-noautopatrol'), $errors)) {
1670                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1671                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1672                         $wgOut->returnToMain( false, $return );
1673                         return;
1674                 }
1675
1676                 if (!empty($errors))
1677                 {
1678                         $wgOut->showPermissionsErrorPage( $errors );
1679                         return;
1680                 }
1681
1682                 # Inform the user
1683                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1684                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1685                 $wgOut->returnToMain( false, $return );
1686         }
1687
1688         /**
1689          * User-interface handler for the "watch" action
1690          */
1691
1692         function watch() {
1693
1694                 global $wgUser, $wgOut;
1695
1696                 if ( $wgUser->isAnon() ) {
1697                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1698                         return;
1699                 }
1700                 if ( wfReadOnly() ) {
1701                         $wgOut->readOnlyPage();
1702                         return;
1703                 }
1704
1705                 if( $this->doWatch() ) {
1706                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1707                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1708
1709                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1710                 }
1711
1712                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1713         }
1714
1715         /**
1716          * Add this page to $wgUser's watchlist
1717          * @return bool true on successful watch operation
1718          */
1719         function doWatch() {
1720                 global $wgUser;
1721                 if( $wgUser->isAnon() ) {
1722                         return false;
1723                 }
1724
1725                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1726                         $wgUser->addWatch( $this->mTitle );
1727
1728                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1729                 }
1730
1731                 return false;
1732         }
1733
1734         /**
1735          * User interface handler for the "unwatch" action.
1736          */
1737         function unwatch() {
1738
1739                 global $wgUser, $wgOut;
1740
1741                 if ( $wgUser->isAnon() ) {
1742                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1743                         return;
1744                 }
1745                 if ( wfReadOnly() ) {
1746                         $wgOut->readOnlyPage();
1747                         return;
1748                 }
1749
1750                 if( $this->doUnwatch() ) {
1751                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1752                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1753
1754                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1755                 }
1756
1757                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1758         }
1759
1760         /**
1761          * Stop watching a page
1762          * @return bool true on successful unwatch
1763          */
1764         function doUnwatch() {
1765                 global $wgUser;
1766                 if( $wgUser->isAnon() ) {
1767                         return false;
1768                 }
1769
1770                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1771                         $wgUser->removeWatch( $this->mTitle );
1772
1773                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1774                 }
1775
1776                 return false;
1777         }
1778
1779         /**
1780          * action=protect handler
1781          */
1782         function protect() {
1783                 $form = new ProtectionForm( $this );
1784                 $form->execute();
1785         }
1786
1787         /**
1788          * action=unprotect handler (alias)
1789          */
1790         function unprotect() {
1791                 $this->protect();
1792         }
1793
1794         /**
1795          * Update the article's restriction field, and leave a log entry.
1796          *
1797          * @param array $limit set of restriction keys
1798          * @param string $reason
1799          * @return bool true on success
1800          */
1801         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1802                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1803
1804                 $id = $this->mTitle->getArticleID();
1805                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1806                         return false;
1807                 }
1808
1809                 if( !$cascade ) {
1810                         $cascade = false;
1811                 }
1812
1813                 // Take this opportunity to purge out expired restrictions
1814                 Title::purgeExpiredRestrictions();
1815
1816                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1817                 # we expect a single selection, but the schema allows otherwise.
1818                 $current = array();
1819                 foreach( $wgRestrictionTypes as $action )
1820                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1821
1822                 $current = Article::flattenRestrictions( $current );
1823                 $updated = Article::flattenRestrictions( $limit );
1824
1825                 $changed = ( $current != $updated );
1826                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1827                 $changed = $changed || ($updated && $this->mTitle->mRestrictionsExpiry != $expiry);
1828                 $protect = ( $updated != '' );
1829
1830                 # If nothing's changed, do nothing
1831                 if( $changed ) {
1832                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1833
1834                                 $dbw = wfGetDB( DB_MASTER );
1835
1836                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1837
1838                                 $expiry_description = '';
1839                                 if( $encodedExpiry != 'infinity' ) {
1840                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',
1841                                                 $wgContLang->timeanddate( $expiry, false, false ) ).')';
1842                                 }
1843
1844                                 # Prepare a null revision to be added to the history
1845                                 $modified = $current != '' && $protect;
1846                                 if( $protect ) {
1847                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1848                                 } else {
1849                                         $comment_type = 'unprotectedarticle';
1850                                 }
1851                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1852
1853                                 # Only restrictions with the 'protect' right can cascade...
1854                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1855                                 foreach( $limit as $action => $restriction ) {
1856                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1857                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1858                                                 $cascade = false;
1859                                                 break;
1860                                         }
1861                                 }
1862
1863                                 $cascade_description = '';
1864                                 if( $cascade ) {
1865                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1866                                 }
1867
1868                                 if( $reason )
1869                                         $comment .= ": $reason";
1870
1871                                 $editComment = $comment;
1872                                 if( $protect )
1873                                         $editComment .= " [$updated]";
1874                                 if( $expiry_description && $protect )
1875                                         $editComment .= "$expiry_description";
1876                                 if( $cascade )
1877                                         $editComment .= "$cascade_description";
1878                                 # Update restrictions table
1879                                 foreach( $limit as $action => $restrictions ) {
1880                                         if ($restrictions != '' ) {
1881                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1882                                                         array( 'pr_page' => $id, 'pr_type' => $action
1883                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1884                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1885                                         } else {
1886                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1887                                                         'pr_type' => $action ), __METHOD__ );
1888                                         }
1889                                 }
1890
1891                                 # Insert a null revision
1892                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1893                                 $nullRevId = $nullRevision->insertOn( $dbw );
1894
1895                                 $latest = $this->getLatest();
1896                                 # Update page record
1897                                 $dbw->update( 'page',
1898                                         array( /* SET */
1899                                                 'page_touched' => $dbw->timestamp(),
1900                                                 'page_restrictions' => '',
1901                                                 'page_latest' => $nullRevId
1902                                         ), array( /* WHERE */
1903                                                 'page_id' => $id
1904                                         ), 'Article::protect'
1905                                 );
1906
1907                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest) );
1908                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1909
1910                                 # Update the protection log
1911                                 $log = new LogPage( 'protect' );
1912                                 if( $protect ) {
1913                                         $params = array($updated,$encodedExpiry,$cascade ? 'cascade' : '');
1914                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1915                                 } else {
1916                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1917                                 }
1918
1919                         } # End hook
1920                 } # End "changed" check
1921
1922                 return true;
1923         }
1924
1925         /**
1926          * Take an array of page restrictions and flatten it to a string
1927          * suitable for insertion into the page_restrictions field.
1928          * @param array $limit
1929          * @return string
1930          * @private
1931          */
1932         function flattenRestrictions( $limit ) {
1933                 if( !is_array( $limit ) ) {
1934                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1935                 }
1936                 $bits = array();
1937                 ksort( $limit );
1938                 foreach( $limit as $action => $restrictions ) {
1939                         if( $restrictions != '' ) {
1940                                 $bits[] = "$action=$restrictions";
1941                         }
1942                 }
1943                 return implode( ':', $bits );
1944         }
1945
1946         /**
1947          * Auto-generates a deletion reason
1948          * @param bool &$hasHistory Whether the page has a history
1949          */
1950         public function generateReason(&$hasHistory)
1951         {
1952                 global $wgContLang;
1953                 $dbw = wfGetDB(DB_MASTER);
1954                 // Get the last revision
1955                 $rev = Revision::newFromTitle($this->mTitle);
1956                 if(is_null($rev))
1957                         return false;
1958                 // Get the article's contents
1959                 $contents = $rev->getText();
1960                 $blank = false;
1961                 // If the page is blank, use the text from the previous revision,
1962                 // which can only be blank if there's a move/import/protect dummy revision involved
1963                 if($contents == '')
1964                 {
1965                         $prev = $rev->getPrevious();
1966                         if($prev)
1967                         {
1968                                 $contents = $prev->getText();
1969                                 $blank = true;
1970                         }
1971                 }
1972
1973                 // Find out if there was only one contributor
1974                 // Only scan the last 20 revisions
1975                 $limit = 20;
1976                 $res = $dbw->select('revision', 'rev_user_text', array('rev_page' => $this->getID()), __METHOD__,
1977                                 array('LIMIT' => $limit));
1978                 if($res === false)
1979                         // This page has no revisions, which is very weird
1980                         return false;
1981                 if($res->numRows() > 1)
1982                                 $hasHistory = true;
1983                 else
1984                                 $hasHistory = false;
1985                 $row = $dbw->fetchObject($res);
1986                 $onlyAuthor = $row->rev_user_text;
1987                 // Try to find a second contributor
1988                 foreach( $res as $row ) {
1989                         if($row->rev_user_text != $onlyAuthor) {
1990                                 $onlyAuthor = false;
1991                                 break;
1992                         }
1993                 }
1994                 $dbw->freeResult($res);
1995
1996                 // Generate the summary with a '$1' placeholder
1997                 if($blank) {
1998                         // The current revision is blank and the one before is also
1999                         // blank. It's just not our lucky day
2000                         $reason = wfMsgForContent('exbeforeblank', '$1');
2001                 } else {
2002                         if($onlyAuthor)
2003                                 $reason = wfMsgForContent('excontentauthor', '$1', $onlyAuthor);
2004                         else
2005                                 $reason = wfMsgForContent('excontent', '$1');
2006                 }
2007
2008                 // Replace newlines with spaces to prevent uglyness
2009                 $contents = preg_replace("/[\n\r]/", ' ', $contents);
2010                 // Calculate the maximum amount of chars to get
2011                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2012                 $maxLength = 255 - (strlen($reason) - 2) - 3;
2013                 $contents = $wgContLang->truncate($contents, $maxLength, '...');
2014                 // Remove possible unfinished links
2015                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2016                 // Now replace the '$1' placeholder
2017                 $reason = str_replace( '$1', $contents, $reason );
2018                 return $reason;
2019         }
2020
2021
2022         /*
2023          * UI entry point for page deletion
2024          */
2025         function delete() {
2026                 global $wgUser, $wgOut, $wgRequest;
2027
2028                 $confirm = $wgRequest->wasPosted() &&
2029                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2030
2031                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2032                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2033
2034                 $reason = $this->DeleteReasonList;
2035
2036                 if ( $reason != 'other' && $this->DeleteReason != '') {
2037                         // Entry from drop down menu + additional comment
2038                         $reason .= ': ' . $this->DeleteReason;
2039                 } elseif ( $reason == 'other' ) {
2040                         $reason = $this->DeleteReason;
2041                 }
2042                 # Flag to hide all contents of the archived revisions
2043                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2044
2045                 # This code desperately needs to be totally rewritten
2046
2047                 # Read-only check...
2048                 if ( wfReadOnly() ) {
2049                         $wgOut->readOnlyPage();
2050                         return;
2051                 }
2052
2053                 # Check permissions
2054                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2055
2056                 if (count($permission_errors)>0) {
2057                         $wgOut->showPermissionsErrorPage( $permission_errors );
2058                         return;
2059                 }
2060
2061                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2062
2063                 # Better double-check that it hasn't been deleted yet!
2064                 $dbw = wfGetDB( DB_MASTER );
2065                 $conds = $this->mTitle->pageCond();
2066                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2067                 if ( $latest === false ) {
2068                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2069                         return;
2070                 }
2071
2072                 # Hack for big sites
2073                 $bigHistory = $this->isBigDeletion();
2074                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2075                         global $wgLang, $wgDeleteRevisionsLimit;
2076                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2077                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2078                         return;
2079                 }
2080
2081                 if( $confirm ) {
2082                         $this->doDelete( $reason, $suppress );
2083                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2084                                 $this->doWatch();
2085                         } elseif( $this->mTitle->userIsWatching() ) {
2086                                 $this->doUnwatch();
2087                         }
2088                         return;
2089                 }
2090
2091                 // Generate deletion reason
2092                 $hasHistory = false;
2093                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2094
2095                 // If the page has a history, insert a warning
2096                 if( $hasHistory && !$confirm ) {
2097                         $skin=$wgUser->getSkin();
2098                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2099                         if( $bigHistory ) {
2100                                 global $wgLang, $wgDeleteRevisionsLimit;
2101                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2102                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2103                         }
2104                 }
2105
2106                 return $this->confirmDelete( $reason );
2107         }
2108
2109         /**
2110          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2111          */
2112         function isBigDeletion() {
2113                 global $wgDeleteRevisionsLimit;
2114                 if( $wgDeleteRevisionsLimit ) {
2115                         $revCount = $this->estimateRevisionCount();
2116                         return $revCount > $wgDeleteRevisionsLimit;
2117                 }
2118                 return false;
2119         }
2120
2121         /**
2122          * @return int approximate revision count
2123          */
2124         function estimateRevisionCount() {
2125                 $dbr = wfGetDB();
2126                 // For an exact count...
2127                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2128                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2129                 return $dbr->estimateRowCount( 'revision', '*',
2130                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2131         }
2132
2133         /**
2134          * Get the last N authors
2135          * @param int $num Number of revisions to get
2136          * @param string $revLatest The latest rev_id, selected from the master (optional)
2137          * @return array Array of authors, duplicates not removed
2138          */
2139         function getLastNAuthors( $num, $revLatest = 0 ) {
2140                 wfProfileIn( __METHOD__ );
2141
2142                 // First try the slave
2143                 // If that doesn't have the latest revision, try the master
2144                 $continue = 2;
2145                 $db = wfGetDB( DB_SLAVE );
2146                 do {
2147                         $res = $db->select( array( 'page', 'revision' ),
2148                                 array( 'rev_id', 'rev_user_text' ),
2149                                 array(
2150                                         'page_namespace' => $this->mTitle->getNamespace(),
2151                                         'page_title' => $this->mTitle->getDBkey(),
2152                                         'rev_page = page_id'
2153                                 ), __METHOD__, $this->getSelectOptions( array(
2154                                         'ORDER BY' => 'rev_timestamp DESC',
2155                                         'LIMIT' => $num
2156                                 ) )
2157                         );
2158                         if ( !$res ) {
2159                                 wfProfileOut( __METHOD__ );
2160                                 return array();
2161                         }
2162                         $row = $db->fetchObject( $res );
2163                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2164                                 $db = wfGetDB( DB_MASTER );
2165                                 $continue--;
2166                         } else {
2167                                 $continue = 0;
2168                         }
2169                 } while ( $continue );
2170
2171                 $authors = array( $row->rev_user_text );
2172                 while ( $row = $db->fetchObject( $res ) ) {
2173                         $authors[] = $row->rev_user_text;
2174                 }
2175                 wfProfileOut( __METHOD__ );
2176                 return $authors;
2177         }
2178
2179         /**
2180          * Output deletion confirmation dialog
2181          * @param $reason string Prefilled reason
2182          */
2183         function confirmDelete( $reason ) {
2184                 global $wgOut, $wgUser, $wgContLang;
2185                 $align = $wgContLang->isRtl() ? 'left' : 'right';
2186
2187                 wfDebug( "Article::confirmDelete\n" );
2188
2189                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2190                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2191                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2192
2193                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2194                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\"><td></td><td>";
2195                         $suppress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2196                         $suppress .= "</td></tr>";
2197                 } else {
2198                         $suppress = '';
2199                 }
2200
2201                 $form = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2202                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2203                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2204                         Xml::openElement( 'table' ) .
2205                         "<tr id=\"wpDeleteReasonListRow\">
2206                                 <td align='$align'>" .
2207                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2208                                 "</td>
2209                                 <td>" .
2210                                         Xml::listDropDown( 'wpDeleteReasonList',
2211                                                 wfMsgForContent( 'deletereason-dropdown' ),
2212                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2213                                 "</td>
2214                         </tr>
2215                         <tr id=\"wpDeleteReasonRow\">
2216                                 <td align='$align'>" .
2217                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2218                                 "</td>
2219                                 <td>" .
2220                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255', 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2221                                 "</td>
2222                         </tr>
2223                         <tr>
2224                                 <td></td>
2225                                 <td>" .
2226                                         Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '3' ) ) .
2227                                 "</td>
2228                         </tr>
2229                         $suppress
2230                         <tr>
2231                                 <td></td>
2232                                 <td>" .
2233                                         Xml::submitButton( wfMsg( 'deletepage' ), array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '4' ) ) .
2234                                 "</td>
2235                         </tr>" .
2236                         Xml::closeElement( 'table' ) .
2237                         Xml::closeElement( 'fieldset' ) .
2238                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2239                         Xml::closeElement( 'form' );
2240
2241                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2242                                 $skin = $wgUser->getSkin();
2243                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2244                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2245                         }
2246
2247                 $wgOut->addHTML( $form );
2248                 $this->showLogExtract( $wgOut );
2249         }
2250
2251
2252         /**
2253          * Show relevant lines from the deletion log
2254          */
2255         function showLogExtract( $out ) {
2256                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2257                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2258         }
2259
2260
2261         /**
2262          * Perform a deletion and output success or failure messages
2263          */
2264         function doDelete( $reason, $suppress = false ) {
2265                 global $wgOut, $wgUser;
2266                 wfDebug( __METHOD__."\n" );
2267
2268                 $id = $this->getId();
2269
2270                 $error = '';
2271
2272                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error))) {
2273                         if ( $this->doDeleteArticle( $reason, $suppress ) ) {
2274                                 $deleted = $this->mTitle->getPrefixedText();
2275
2276                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2277                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2278
2279                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2280
2281                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2282                                 $wgOut->returnToMain( false );
2283                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2284                         } else {
2285                                 if ($error = '')
2286                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2287                                 else
2288                                         $wgOut->showFatalError( $error );
2289                         }
2290                 }
2291         }
2292
2293         /**
2294          * Back-end article deletion
2295          * Deletes the article with database consistency, writes logs, purges caches
2296          * Returns success
2297          */
2298         function doDeleteArticle( $reason, $suppress = false ) {
2299                 global $wgUseSquid, $wgDeferredUpdateList;
2300                 global $wgUseTrackbacks;
2301
2302                 wfDebug( __METHOD__."\n" );
2303
2304                 $dbw = wfGetDB( DB_MASTER );
2305                 $ns = $this->mTitle->getNamespace();
2306                 $t = $this->mTitle->getDBkey();
2307                 $id = $this->mTitle->getArticleID();
2308
2309                 if ( $t == '' || $id == 0 ) {
2310                         return false;
2311                 }
2312
2313                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2314                 array_push( $wgDeferredUpdateList, $u );
2315
2316                 // Bitfields to further suppress the content
2317                 if ( $suppress ) {
2318                         $bitfield = 0;
2319                         // This should be 15...
2320                         $bitfield |= Revision::DELETED_TEXT;
2321                         $bitfield |= Revision::DELETED_COMMENT;
2322                         $bitfield |= Revision::DELETED_USER;
2323                         $bitfield |= Revision::DELETED_RESTRICTED;
2324                 } else {
2325                         $bitfield = 'rev_deleted';
2326                 }
2327
2328                 $dbw->begin();
2329                 // For now, shunt the revision data into the archive table.
2330                 // Text is *not* removed from the text table; bulk storage
2331                 // is left intact to avoid breaking block-compression or
2332                 // immutable storage schemes.
2333                 //
2334                 // For backwards compatibility, note that some older archive
2335                 // table entries will have ar_text and ar_flags fields still.
2336                 //
2337                 // In the future, we may keep revisions and mark them with
2338                 // the rev_deleted field, which is reserved for this purpose.
2339                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2340                         array(
2341                                 'ar_namespace'  => 'page_namespace',
2342                                 'ar_title'      => 'page_title',
2343                                 'ar_comment'    => 'rev_comment',
2344                                 'ar_user'       => 'rev_user',
2345                                 'ar_user_text'  => 'rev_user_text',
2346                                 'ar_timestamp'  => 'rev_timestamp',
2347                                 'ar_minor_edit' => 'rev_minor_edit',
2348                                 'ar_rev_id'     => 'rev_id',
2349                                 'ar_text_id'    => 'rev_text_id',
2350                                 'ar_text'       => '\'\'', // Be explicit to appease
2351                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2352                                 'ar_len'        => 'rev_len',
2353                                 'ar_page_id'    => 'page_id',
2354                                 'ar_deleted'    => $bitfield
2355                         ), array(
2356                                 'page_id' => $id,
2357                                 'page_id = rev_page'
2358                         ), __METHOD__
2359                 );
2360
2361                 # Delete restrictions for it
2362                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2363
2364                 # Fix category table counts
2365                 $cats = array();
2366                 $res = $dbw->select( 'categorylinks', 'cl_to',
2367                         array( 'cl_from' => $id ), __METHOD__ );
2368                 foreach( $res as $row ) {
2369                         $cats []= $row->cl_to;
2370                 }
2371                 $this->updateCategoryCounts( array(), $cats );
2372
2373                 # Now that it's safely backed up, delete it
2374                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2375                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2376                 if( !$ok ) {
2377                         $dbw->rollback();
2378                         return false;
2379                 }
2380
2381                 # If using cascading deletes, we can skip some explicit deletes
2382                 if ( !$dbw->cascadingDeletes() ) {
2383                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2384
2385                         if ($wgUseTrackbacks)
2386                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2387
2388                         # Delete outgoing links
2389                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2390                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2391                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2392                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2393                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2394                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2395                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2396                 }
2397
2398                 # If using cleanup triggers, we can skip some manual deletes
2399                 if ( !$dbw->cleanupTriggers() ) {
2400
2401                         # Clean up recentchanges entries...
2402                         $dbw->delete( 'recentchanges',
2403                                 array( 'rc_namespace' => $ns, 'rc_title' => $t, 'rc_type != '.RC_LOG ),
2404                                 __METHOD__ );
2405                 }
2406                 $dbw->commit();
2407
2408                 # Clear caches
2409                 Article::onArticleDelete( $this->mTitle );
2410
2411                 # Clear the cached article id so the interface doesn't act like we exist
2412                 $this->mTitle->resetArticleID( 0 );
2413                 $this->mTitle->mArticleID = 0;
2414
2415                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2416                 $logtype = $suppress ? 'suppress' : 'delete';
2417                 $log = new LogPage( $logtype );
2418
2419                 # Make sure logging got through
2420                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2421
2422                 return true;
2423         }
2424
2425         /**
2426          * Roll back the most recent consecutive set of edits to a page
2427          * from the same user; fails if there are no eligible edits to
2428          * roll back to, e.g. user is the sole contributor. This function
2429          * performs permissions checks on $wgUser, then calls commitRollback()
2430          * to do the dirty work
2431          *
2432          * @param string $fromP - Name of the user whose edits to rollback.
2433          * @param string $summary - Custom summary. Set to default summary if empty.
2434          * @param string $token - Rollback token.
2435          * @param bool   $bot - If true, mark all reverted edits as bot.
2436          *
2437          * @param array $resultDetails contains result-specific array of additional values
2438          *    'alreadyrolled' : 'current' (rev)
2439          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2440          *
2441          * @return array of errors, each error formatted as
2442          *   array(messagekey, param1, param2, ...).
2443          * On success, the array is empty.  This array can also be passed to
2444          * OutputPage::showPermissionsErrorPage().
2445          */
2446         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2447                 global $wgUser;
2448                 $resultDetails = null;
2449
2450                 # Check permissions
2451                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2452                                                 $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2453                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2454                         $errors[] = array( 'sessionfailure' );
2455
2456                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2457                         $errors[] = array( 'actionthrottledtext' );
2458                 }
2459                 # If there were errors, bail out now
2460                 if(!empty($errors))
2461                         return $errors;
2462
2463                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2464         }
2465
2466         /**
2467          * Backend implementation of doRollback(), please refer there for parameter
2468          * and return value documentation
2469          *
2470          * NOTE: This function does NOT check ANY permissions, it just commits the
2471          * rollback to the DB Therefore, you should only call this function direct-
2472          * ly if you want to use custom permissions checks. If you don't, use
2473          * doRollback() instead.
2474          */
2475         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2476                 global $wgUseRCPatrol, $wgUser, $wgLang;
2477                 $dbw = wfGetDB( DB_MASTER );
2478
2479                 if( wfReadOnly() ) {
2480                         return array( array( 'readonlytext' ) );
2481                 }
2482
2483                 # Get the last editor
2484                 $current = Revision::newFromTitle( $this->mTitle );
2485                 if( is_null( $current ) ) {
2486                         # Something wrong... no page?
2487                         return array(array('notanarticle'));
2488                 }
2489
2490                 $from = str_replace( '_', ' ', $fromP );
2491                 if( $from != $current->getUserText() ) {
2492                         $resultDetails = array( 'current' => $current );
2493                         return array(array('alreadyrolled',
2494                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2495                                 htmlspecialchars($fromP),
2496                                 htmlspecialchars($current->getUserText())
2497                         ));
2498                 }
2499
2500                 # Get the last edit not by this guy
2501                 $user = intval( $current->getUser() );
2502                 $user_text = $dbw->addQuotes( $current->getUserText() );
2503                 $s = $dbw->selectRow( 'revision',
2504                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2505                         array(  'rev_page' => $current->getPage(),
2506                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2507                         ), __METHOD__,
2508                         array(  'USE INDEX' => 'page_timestamp',
2509                                 'ORDER BY'  => 'rev_timestamp DESC' )
2510                         );
2511                 if( $s === false ) {
2512                         # No one else ever edited this page
2513                         return array(array('cantrollback'));
2514                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2515                         # Only admins can see this text
2516                         return array(array('notvisiblerev'));
2517                 }
2518
2519                 $set = array();
2520                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2521                         # Mark all reverted edits as bot
2522                         $set['rc_bot'] = 1;
2523                 }
2524                 if ( $wgUseRCPatrol ) {
2525                         # Mark all reverted edits as patrolled
2526                         $set['rc_patrolled'] = 1;
2527                 }
2528
2529                 if ( $set ) {
2530                         $dbw->update( 'recentchanges', $set,
2531                                         array( /* WHERE */
2532                                                 'rc_cur_id' => $current->getPage(),
2533                                                 'rc_user_text' => $current->getUserText(),
2534                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2535                                         ), __METHOD__
2536                                 );
2537                 }
2538
2539                 # Generate the edit summary if necessary
2540                 $target = Revision::newFromId( $s->rev_id );
2541                 if( empty( $summary ) ){
2542                         $summary = wfMsgForContent( 'revertpage' );
2543                 }
2544
2545                 # Allow the custom summary to use the same args as the default message
2546                 $args = array(
2547                         $target->getUserText(), $from, $s->rev_id,
2548                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2549                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2550                 );
2551                 $summary = wfMsgReplaceArgs( $summary, $args );
2552
2553                 # Save
2554                 $flags = EDIT_UPDATE;
2555
2556                 if ($wgUser->isAllowed('minoredit'))
2557                         $flags |= EDIT_MINOR;
2558
2559                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2560                         $flags |= EDIT_FORCE_BOT;
2561                 $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2562
2563                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2564
2565                 $resultDetails = array(
2566                         'summary' => $summary,
2567                         'current' => $current,
2568                         'target' => $target,
2569                 );
2570                 return array();
2571         }
2572
2573         /**
2574          * User interface for rollback operations
2575          */
2576         function rollback() {
2577                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2578                 $details = null;
2579
2580                 $result = $this->doRollback(
2581                         $wgRequest->getVal( 'from' ),
2582                         $wgRequest->getText( 'summary' ),
2583                         $wgRequest->getVal( 'token' ),
2584                         $wgRequest->getBool( 'bot' ),
2585                         $details
2586                 );
2587
2588                 if( in_array( array( 'blocked' ), $result ) ) {
2589                         $wgOut->blockedPage();
2590                         return;
2591                 }
2592                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2593                         $wgOut->rateLimited();
2594                         return;
2595                 }
2596                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ){
2597                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2598                         $errArray = $result[0];
2599                         $errMsg = array_shift( $errArray );
2600                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2601                         if( isset( $details['current'] ) ){
2602                                 $current = $details['current'];
2603                                 if( $current->getComment() != '' ) {
2604                                         $wgOut->addWikiMsgArray( 'editcomment', array( $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2605                                 }
2606                         }
2607                         return;
2608                 }
2609                 # Display permissions errors before read-only message -- there's no
2610                 # point in misleading the user into thinking the inability to rollback
2611                 # is only temporary.
2612                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2613                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2614                         # move any 'readonlytext' error manually.
2615                         $out = array();
2616                         foreach( $result as $error ) {
2617                                 if( $error != array( 'readonlytext' ) ) {
2618                                         $out []= $error;
2619                                 }
2620                         }
2621                         $wgOut->showPermissionsErrorPage( $out );
2622                         return;
2623                 }
2624                 if( $result == array( array('readonlytext') ) ) {
2625                         $wgOut->readOnlyPage();
2626                         return;
2627                 }
2628
2629                 $current = $details['current'];
2630                 $target = $details['target'];
2631                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2632                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2633                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2634                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2635                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2636                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2637                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2638                 $wgOut->returnToMain( false, $this->mTitle );
2639
2640                 if( !$wgRequest->getBool( 'hidediff', false ) ) {
2641                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), 'next', false, true );
2642                         $de->showDiff( '', '' );
2643                 }
2644         }
2645
2646
2647         /**
2648          * Do standard deferred updates after page view
2649          * @private
2650          */
2651         function viewUpdates() {
2652                 global $wgDeferredUpdateList, $wgUser;
2653
2654                 if ( 0 != $this->getID() ) {
2655                         # Don't update page view counters on views from bot users (bug 14044)
2656                         global $wgDisableCounters;
2657                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2658                                 Article::incViewCount( $this->getID() );
2659                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2660                                 array_push( $wgDeferredUpdateList, $u );
2661                         }
2662                 }
2663
2664                 # Update newtalk / watchlist notification status
2665                 $wgUser->clearNotification( $this->mTitle );
2666         }
2667
2668         /**
2669          * Prepare text which is about to be saved.
2670          * Returns a stdclass with source, pst and output members
2671          */
2672         function prepareTextForEdit( $text, $revid=null ) {
2673                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2674                         // Already prepared
2675                         return $this->mPreparedEdit;
2676                 }
2677                 global $wgParser;
2678                 $edit = (object)array();
2679                 $edit->revid = $revid;
2680                 $edit->newText = $text;
2681                 $edit->pst = $this->preSaveTransform( $text );
2682                 $options = new ParserOptions;
2683                 $options->setTidy( true );
2684                 $options->enableLimitReport();
2685                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2686                 $edit->oldText = $this->getContent();
2687                 $this->mPreparedEdit = $edit;
2688                 return $edit;
2689         }
2690
2691         /**
2692          * Do standard deferred updates after page edit.
2693          * Update links tables, site stats, search index and message cache.
2694          * Every 100th edit, prune the recent changes table.
2695          *
2696          * @private
2697          * @param $text New text of the article
2698          * @param $summary Edit summary
2699          * @param $minoredit Minor edit
2700          * @param $timestamp_of_pagechange Timestamp associated with the page change
2701          * @param $newid rev_id value of the new revision
2702          * @param $changed Whether or not the content actually changed
2703          */
2704         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2705                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2706
2707                 wfProfileIn( __METHOD__ );
2708
2709                 # Parse the text
2710                 # Be careful not to double-PST: $text is usually already PST-ed once
2711                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2712                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2713                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2714                 } else {
2715                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2716                         $editInfo = $this->mPreparedEdit;
2717                 }
2718
2719                 # Save it to the parser cache
2720                 if ( $wgEnableParserCache ) {
2721                         $parserCache = ParserCache::singleton();
2722                         $parserCache->save( $editInfo->output, $this, $wgUser );
2723                 }
2724
2725                 # Update the links tables
2726                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2727                 $u->doUpdate();
2728
2729                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2730                         if ( 0 == mt_rand( 0, 99 ) ) {
2731                                 // Flush old entries from the `recentchanges` table; we do this on
2732                                 // random requests so as to avoid an increase in writes for no good reason
2733                                 global $wgRCMaxAge;
2734                                 $dbw = wfGetDB( DB_MASTER );
2735                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2736                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2737                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2738                                 $dbw->query( $sql );
2739                         }
2740                 }
2741
2742                 $id = $this->getID();
2743                 $title = $this->mTitle->getPrefixedDBkey();
2744                 $shortTitle = $this->mTitle->getDBkey();
2745
2746                 if ( 0 == $id ) {
2747                         wfProfileOut( __METHOD__ );
2748                         return;
2749                 }
2750
2751                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2752                 array_push( $wgDeferredUpdateList, $u );
2753                 $u = new SearchUpdate( $id, $title, $text );
2754                 array_push( $wgDeferredUpdateList, $u );
2755
2756                 # If this is another user's talk page, update newtalk
2757                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2758                 # load of user talk pages and piss people off, nor if it's a minor edit
2759                 # by a properly-flagged bot.
2760                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2761                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2762                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2763                                 $other = User::newFromName( $shortTitle, false );
2764                                 if ( !$other ) {
2765                                         wfDebug( __METHOD__.": invalid username\n" );
2766                                 } elseif( User::isIP( $shortTitle ) ) {
2767                                         // An anonymous user
2768                                         $other->setNewtalk( true );
2769                                 } elseif( $other->isLoggedIn() ) {
2770                                         $other->setNewtalk( true );
2771                                 } else {
2772                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2773                                 }
2774                         }
2775                 }
2776
2777                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2778                         $wgMessageCache->replace( $shortTitle, $text );
2779                 }
2780
2781                 wfProfileOut( __METHOD__ );
2782         }
2783
2784         /**
2785          * Perform article updates on a special page creation.
2786          *
2787          * @param Revision $rev
2788          *
2789          * @todo This is a shitty interface function. Kill it and replace the
2790          * other shitty functions like editUpdates and such so it's not needed
2791          * anymore.
2792          */
2793         function createUpdates( $rev ) {
2794                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2795                 $this->mTotalAdjustment = 1;
2796                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2797                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2798         }
2799
2800         /**
2801          * Generate the navigation links when browsing through an article revisions
2802          * It shows the information as:
2803          *   Revision as of \<date\>; view current revision
2804          *   \<- Previous version | Next Version -\>
2805          *
2806          * @private
2807          * @param string $oldid         Revision ID of this article revision
2808          */
2809         function setOldSubtitle( $oldid=0 ) {
2810                 global $wgLang, $wgOut, $wgUser;
2811
2812                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2813                                 return;
2814                 }
2815
2816                 $revision = Revision::newFromId( $oldid );
2817
2818                 $current = ( $oldid == $this->mLatest );
2819                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2820                 $sk = $wgUser->getSkin();
2821                 $lnk = $current
2822                         ? wfMsg( 'currentrevisionlink' )
2823                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2824                 $curdiff = $current
2825                         ? wfMsg( 'diff' )
2826                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2827                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2828                 $prevlink = $prev
2829                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2830                         : wfMsg( 'previousrevision' );
2831                 $prevdiff = $prev
2832                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2833                         : wfMsg( 'diff' );
2834                 $nextlink = $current
2835                         ? wfMsg( 'nextrevision' )
2836                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2837                 $nextdiff = $current
2838                         ? wfMsg( 'diff' )
2839                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2840
2841                 $cdel='';
2842                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2843                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2844                         if( $revision->isCurrent() ) {
2845                         // We don't handle top deleted edits too well
2846                                 $cdel = wfMsgHtml('rev-delundel');
2847                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2848                         // If revision was hidden from sysops
2849                                 $cdel = wfMsgHtml('rev-delundel');
2850                         } else {
2851                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2852                                         wfMsgHtml('rev-delundel'),
2853                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2854                                         '&oldid=' . urlencode( $oldid ) );
2855                                 // Bolden oversighted content
2856                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2857                                         $cdel = "<strong>$cdel</strong>";
2858                         }
2859                         $cdel = "(<small>$cdel</small>) ";
2860                 }
2861                 # Show user links if allowed to see them. Normally they
2862                 # are hidden regardless, but since we can already see the text here...
2863                 $userlinks = $sk->revUserTools( $revision, false );
2864
2865                 $m = wfMsg( 'revision-info-current' );
2866                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2867                         ? 'revision-info-current'
2868                         : 'revision-info';
2869
2870                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2871
2872                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2873                 $wgOut->setSubtitle( $r );
2874         }
2875
2876         /**
2877          * This function is called right before saving the wikitext,
2878          * so we can do things like signatures and links-in-context.
2879          *
2880          * @param string $text
2881          */
2882         function preSaveTransform( $text ) {
2883                 global $wgParser, $wgUser;
2884                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2885         }
2886
2887         /* Caching functions */
2888
2889         /**
2890          * checkLastModified returns true if it has taken care of all
2891          * output to the client that is necessary for this request.
2892          * (that is, it has sent a cached version of the page)
2893          */
2894         function tryFileCache() {
2895                 static $called = false;
2896                 if( $called ) {
2897                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2898                         return;
2899                 }
2900                 $called = true;
2901                 if($this->isFileCacheable()) {
2902                         $touched = $this->mTouched;
2903                         $cache = new HTMLFileCache( $this->mTitle );
2904                         if($cache->isFileCacheGood( $touched )) {
2905                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2906                                 $cache->loadFromFileCache();
2907                                 return true;
2908                         } else {
2909                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2910                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2911                         }
2912                 } else {
2913                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2914                 }
2915         }
2916
2917         /**
2918          * Check if the page can be cached
2919          * @return bool
2920          */
2921         function isFileCacheable() {
2922                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2923                 $action    = $wgRequest->getVal( 'action'    );
2924                 $oldid     = $wgRequest->getVal( 'oldid'     );
2925                 $diff      = $wgRequest->getVal( 'diff'      );
2926                 $redirect  = $wgRequest->getVal( 'redirect'  );
2927                 $printable = $wgRequest->getVal( 'printable' );
2928                 $page      = $wgRequest->getVal( 'page' );
2929                 $useskin   = $wgRequest->getVal( 'useskin' );
2930
2931                 //check for non-standard user language; this covers uselang,
2932                 //and extensions for auto-detecting user language.
2933                 $ulang     = $wgLang->getCode();
2934                 $clang     = $wgContLang->getCode();
2935
2936                 $cacheable = $wgUseFileCache
2937                         && (!$wgShowIPinHeader)
2938                         && ($this->getID() != 0)
2939                         && ($wgUser->isAnon())
2940                         && (!$wgUser->getNewtalk())
2941                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2942                         && (!isset($useskin))
2943                         && (empty( $action ) || $action == 'view')
2944                         && (!isset($oldid))
2945                         && (!isset($diff))
2946                         && (!isset($redirect))
2947                         && (!isset($printable))
2948                         && !isset($page)
2949                         && (!$this->mRedirectedFrom)
2950                         && ($ulang === $clang);
2951
2952                 if ( $cacheable ) {
2953                         //extension may have reason to disable file caching on some pages.
2954                         $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
2955                 }
2956
2957                 return $cacheable;
2958         }
2959
2960         /**
2961          * Loads page_touched and returns a value indicating if it should be used
2962          *
2963          */
2964         function checkTouched() {
2965                 if( !$this->mDataLoaded ) {
2966                         $this->loadPageData();
2967                 }
2968                 return !$this->mIsRedirect;
2969         }
2970
2971         /**
2972          * Get the page_touched field
2973          */
2974         function getTouched() {
2975                 # Ensure that page data has been loaded
2976                 if( !$this->mDataLoaded ) {
2977                         $this->loadPageData();
2978                 }
2979                 return $this->mTouched;
2980         }
2981
2982         /**
2983          * Get the page_latest field
2984          */
2985         function getLatest() {
2986                 if ( !$this->mDataLoaded ) {
2987                         $this->loadPageData();
2988                 }
2989                 return $this->mLatest;
2990         }
2991
2992         /**
2993          * Edit an article without doing all that other stuff
2994          * The article must already exist; link tables etc
2995          * are not updated, caches are not flushed.
2996          *
2997          * @param string $text text submitted
2998          * @param string $comment comment submitted
2999          * @param bool $minor whereas it's a minor modification
3000          */
3001         function quickEdit( $text, $comment = '', $minor = 0 ) {
3002                 wfProfileIn( __METHOD__ );
3003
3004                 $dbw = wfGetDB( DB_MASTER );
3005                 $dbw->begin();
3006                 $revision = new Revision( array(
3007                         'page'       => $this->getId(),
3008                         'text'       => $text,
3009                         'comment'    => $comment,
3010                         'minor_edit' => $minor ? 1 : 0,
3011                         ) );
3012                 $revision->insertOn( $dbw );
3013                 $this->updateRevisionOn( $dbw, $revision );
3014                 $dbw->commit();
3015
3016                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
3017
3018                 wfProfileOut( __METHOD__ );
3019         }
3020
3021         /**
3022          * Used to increment the view counter
3023          *
3024          * @static
3025          * @param integer $id article id
3026          */
3027         function incViewCount( $id ) {
3028                 $id = intval( $id );
3029                 global $wgHitcounterUpdateFreq, $wgDBtype;
3030
3031                 $dbw = wfGetDB( DB_MASTER );
3032                 $pageTable = $dbw->tableName( 'page' );
3033                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3034                 $acchitsTable = $dbw->tableName( 'acchits' );
3035
3036                 if( $wgHitcounterUpdateFreq <= 1 ) {
3037                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3038                         return;
3039                 }
3040
3041                 # Not important enough to warrant an error page in case of failure
3042                 $oldignore = $dbw->ignoreErrors( true );
3043
3044                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3045
3046                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3047                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3048                         # Most of the time (or on SQL errors), skip row count check
3049                         $dbw->ignoreErrors( $oldignore );
3050                         return;
3051                 }
3052
3053                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3054                 $row = $dbw->fetchObject( $res );
3055                 $rown = intval( $row->n );
3056                 if( $rown >= $wgHitcounterUpdateFreq ){
3057                         wfProfileIn( 'Article::incViewCount-collect' );
3058                         $old_user_abort = ignore_user_abort( true );
3059
3060                         if ($wgDBtype == 'mysql')
3061                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3062                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3063                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3064                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3065                                 'GROUP BY hc_id');
3066                         $dbw->query("DELETE FROM $hitcounterTable");
3067                         if ($wgDBtype == 'mysql') {
3068                                 $dbw->query('UNLOCK TABLES');
3069                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3070                                         'WHERE page_id = hc_id');
3071                         }
3072                         else {
3073                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3074                                         "FROM $acchitsTable WHERE page_id = hc_id");
3075                         }
3076                         $dbw->query("DROP TABLE $acchitsTable");
3077
3078                         ignore_user_abort( $old_user_abort );
3079                         wfProfileOut( 'Article::incViewCount-collect' );
3080                 }
3081                 $dbw->ignoreErrors( $oldignore );
3082         }
3083
3084         /**#@+
3085          * The onArticle*() functions are supposed to be a kind of hooks
3086          * which should be called whenever any of the specified actions
3087          * are done.
3088          *
3089          * This is a good place to put code to clear caches, for instance.
3090          *
3091          * This is called on page move and undelete, as well as edit
3092          * @static
3093          * @param $title_obj a title object
3094          */
3095
3096         static function onArticleCreate($title) {
3097                 # The talk page isn't in the regular link tables, so we need to update manually:
3098                 if ( $title->isTalkPage() ) {
3099                         $other = $title->getSubjectPage();
3100                 } else {
3101                         $other = $title->getTalkPage();
3102                 }
3103                 $other->invalidateCache();
3104                 $other->purgeSquid();
3105
3106                 $title->touchLinks();
3107                 $title->purgeSquid();
3108                 $title->deleteTitleProtection();
3109         }
3110
3111         static function onArticleDelete( $title ) {
3112                 global $wgUseFileCache, $wgMessageCache;
3113
3114                 // Update existence markers on article/talk tabs...
3115                 if( $title->isTalkPage() ) {
3116                         $other = $title->getSubjectPage();
3117                 } else {
3118                         $other = $title->getTalkPage();
3119                 }
3120                 $other->invalidateCache();
3121                 $other->purgeSquid();
3122
3123                 $title->touchLinks();
3124                 $title->purgeSquid();
3125
3126                 # File cache
3127                 if ( $wgUseFileCache ) {
3128                         $cm = new HTMLFileCache( $title );
3129                         @unlink( $cm->fileCacheName() );
3130                 }
3131
3132                 # Messages
3133                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3134                         $wgMessageCache->replace( $title->getDBkey(), false );
3135                 }
3136                 # Images
3137                 if( $title->getNamespace() == NS_IMAGE ) {
3138                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3139                         $update->doUpdate();
3140                 }
3141                 # User talk pages
3142                 if( $title->getNamespace() == NS_USER_TALK ) {
3143                         $user = User::newFromName( $title->getText(), false );
3144                         $user->setNewtalk( false );
3145                 }
3146         }
3147
3148         /**
3149          * Purge caches on page update etc
3150          */
3151         static function onArticleEdit( $title ) {
3152                 global $wgDeferredUpdateList, $wgUseFileCache;
3153
3154                 // Invalidate caches of articles which include this page
3155                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3156
3157                 // Invalidate the caches of all pages which redirect here
3158                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3159
3160                 # Purge squid for this page only
3161                 $title->purgeSquid();
3162
3163                 # Clear file cache
3164                 if ( $wgUseFileCache ) {
3165                         $cm = new HTMLFileCache( $title );
3166                         @unlink( $cm->fileCacheName() );
3167                 }
3168         }
3169
3170         /**#@-*/
3171
3172         /**
3173          * Overriden by ImagePage class, only present here to avoid a fatal error
3174          * Called for ?action=revert
3175          */
3176         public function revert(){
3177                 global $wgOut;
3178                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3179         }
3180
3181         /**
3182          * Info about this page
3183          * Called for ?action=info when $wgAllowPageInfo is on.
3184          *
3185          * @public
3186          */
3187         function info() {
3188                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3189
3190                 if ( !$wgAllowPageInfo ) {
3191                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3192                         return;
3193                 }
3194
3195                 $page = $this->mTitle->getSubjectPage();
3196
3197                 $wgOut->setPagetitle( $page->getPrefixedText() );
3198                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3199                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3200
3201                 if( !$this->mTitle->exists() ) {
3202                         $wgOut->addHtml( '<div class="noarticletext">' );
3203                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3204                                 // This doesn't quite make sense; the user is asking for
3205                                 // information about the _page_, not the message... -- RC
3206                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3207                         } else {
3208                                 $msg = $wgUser->isLoggedIn()
3209                                         ? 'noarticletext'
3210                                         : 'noarticletextanon';
3211                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3212                         }
3213                         $wgOut->addHtml( '</div>' );
3214                 } else {
3215                         $dbr = wfGetDB( DB_SLAVE );
3216                         $wl_clause = array(
3217                                 'wl_title'     => $page->getDBkey(),
3218                                 'wl_namespace' => $page->getNamespace() );
3219                         $numwatchers = $dbr->selectField(
3220                                 'watchlist',
3221                                 'COUNT(*)',
3222                                 $wl_clause,
3223                                 __METHOD__,
3224                                 $this->getSelectOptions() );
3225
3226                         $pageInfo = $this->pageCountInfo( $page );
3227                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3228
3229                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3230                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3231                         if( $talkInfo ) {
3232                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3233                         }
3234                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3235                         if( $talkInfo ) {
3236                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3237                         }
3238                         $wgOut->addHTML( '</ul>' );
3239
3240                 }
3241         }
3242
3243         /**
3244          * Return the total number of edits and number of unique editors
3245          * on a given page. If page does not exist, returns false.
3246          *
3247          * @param Title $title
3248          * @return array
3249          * @private
3250          */
3251         function pageCountInfo( $title ) {
3252                 $id = $title->getArticleId();
3253                 if( $id == 0 ) {
3254                         return false;
3255                 }
3256
3257                 $dbr = wfGetDB( DB_SLAVE );
3258
3259                 $rev_clause = array( 'rev_page' => $id );
3260
3261                 $edits = $dbr->selectField(
3262                         'revision',
3263                         'COUNT(rev_page)',
3264                         $rev_clause,
3265                         __METHOD__,
3266                         $this->getSelectOptions() );
3267
3268                 $authors = $dbr->selectField(
3269                         'revision',
3270                         'COUNT(DISTINCT rev_user_text)',
3271                         $rev_clause,
3272                         __METHOD__,
3273                         $this->getSelectOptions() );
3274
3275                 return array( 'edits' => $edits, 'authors' => $authors );
3276         }
3277
3278         /**
3279          * Return a list of templates used by this article.
3280          * Uses the templatelinks table
3281          *
3282          * @return array Array of Title objects
3283          */
3284         function getUsedTemplates() {
3285                 $result = array();
3286                 $id = $this->mTitle->getArticleID();
3287                 if( $id == 0 ) {
3288                         return array();
3289                 }
3290
3291                 $dbr = wfGetDB( DB_SLAVE );
3292                 $res = $dbr->select( array( 'templatelinks' ),
3293                         array( 'tl_namespace', 'tl_title' ),
3294                         array( 'tl_from' => $id ),
3295                         __METHOD__ );
3296                 if( false !== $res ) {
3297                         foreach( $res as $row ) {
3298                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3299                         }
3300                 }
3301                 $dbr->freeResult( $res );
3302                 return $result;
3303         }
3304
3305         /**
3306          * Returns a list of hidden categories this page is a member of.
3307          * Uses the page_props and categorylinks tables.
3308          *
3309          * @return array Array of Title objects
3310          */
3311         function getHiddenCategories() {
3312                 $result = array();
3313                 $id = $this->mTitle->getArticleID();
3314                 if( $id == 0 ) {
3315                         return array();
3316                 }
3317
3318                 $dbr = wfGetDB( DB_SLAVE );
3319                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3320                         array( 'cl_to' ),
3321                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3322                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3323                         __METHOD__ );
3324                 if ( false !== $res ) {
3325                         foreach( $res as $row ) {
3326                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3327                         }
3328                 }
3329                 $dbr->freeResult( $res );
3330                 return $result;
3331         }
3332
3333         /**
3334         * Return an applicable autosummary if one exists for the given edit.
3335         * @param string $oldtext The previous text of the page.
3336         * @param string $newtext The submitted text of the page.
3337         * @param bitmask $flags A bitmask of flags submitted for the edit.
3338         * @return string An appropriate autosummary, or an empty string.
3339         */
3340         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3341                 # Decide what kind of autosummary is needed.
3342
3343                 # Redirect autosummaries
3344                 $rt = Title::newFromRedirect( $newtext );
3345                 if( is_object( $rt ) ) {
3346                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3347                 }
3348
3349                 # New page autosummaries
3350                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3351                         # If they're making a new article, give its text, truncated, in the summary.
3352                         global $wgContLang;
3353                         $truncatedtext = $wgContLang->truncate(
3354                                 str_replace("\n", ' ', $newtext),
3355                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3356                                 '...' );
3357                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3358                 }
3359
3360                 # Blanking autosummaries
3361                 if( $oldtext != '' && $newtext == '' ) {
3362                         return wfMsgForContent('autosumm-blank');
3363                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3364                         # Removing more than 90% of the article
3365                         global $wgContLang;
3366                         $truncatedtext = $wgContLang->truncate(
3367                                 $newtext,
3368                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3369                                 '...'
3370                         );
3371                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3372                 }
3373
3374                 # If we reach this point, there's no applicable autosummary for our case, so our
3375                 # autosummary is empty.
3376                 return '';
3377         }
3378
3379         /**
3380          * Add the primary page-view wikitext to the output buffer
3381          * Saves the text into the parser cache if possible.
3382          * Updates templatelinks if it is out of date.
3383          *
3384          * @param string  $text
3385          * @param bool    $cache
3386          */
3387         public function outputWikiText( $text, $cache = true ) {
3388                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache;
3389
3390                 $popts = $wgOut->parserOptions();
3391                 $popts->setTidy(true);
3392                 $popts->enableLimitReport();
3393                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3394                         $popts, true, true, $this->getRevIdFetched() );
3395                 $popts->setTidy(false);
3396                 $popts->enableLimitReport( false );
3397                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3398                         $parserCache = ParserCache::singleton();
3399                         $parserCache->save( $parserOutput, $this, $wgUser );
3400                 }
3401
3402                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3403                         // templatelinks table may have become out of sync,
3404                         // especially if using variable-based transclusions.
3405                         // For paranoia, check if things have changed and if
3406                         // so apply updates to the database. This will ensure
3407                         // that cascaded protections apply as soon as the changes
3408                         // are visible.
3409
3410                         # Get templates from templatelinks
3411                         $id = $this->mTitle->getArticleID();
3412
3413                         $tlTemplates = array();
3414
3415                         $dbr = wfGetDB( DB_SLAVE );
3416                         $res = $dbr->select( array( 'templatelinks' ),
3417                                 array( 'tl_namespace', 'tl_title' ),
3418                                 array( 'tl_from' => $id ),
3419                                 __METHOD__ );
3420
3421                         global $wgContLang;
3422
3423                         if ( false !== $res ) {
3424                                 foreach( $res as $row ) {
3425                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3426                                 }
3427                         }
3428
3429                         # Get templates from parser output.
3430                         $poTemplates_allns = $parserOutput->getTemplates();
3431
3432                         $poTemplates = array ();
3433                         foreach ( $poTemplates_allns as $ns_templates ) {
3434                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3435                         }
3436
3437                         # Get the diff
3438                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3439
3440                         if ( count( $templates_diff ) > 0 ) {
3441                                 # Whee, link updates time.
3442                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3443
3444                                 $dbw = wfGetDb( DB_MASTER );
3445                                 $dbw->begin();
3446
3447                                 $u->doUpdate();
3448
3449                                 $dbw->commit();
3450                         }
3451                 }
3452
3453                 $wgOut->addParserOutput( $parserOutput );
3454         }
3455
3456         /**
3457          * Update all the appropriate counts in the category table, given that
3458          * we've added the categories $added and deleted the categories $deleted.
3459          *
3460          * @param $added array   The names of categories that were added
3461          * @param $deleted array The names of categories that were deleted
3462          * @return null
3463          */
3464         public function updateCategoryCounts( $added, $deleted ) {
3465                 $ns = $this->mTitle->getNamespace();
3466                 $dbw = wfGetDB( DB_MASTER );
3467
3468                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3469                 # exist, we might legitimately not create it, but it's simpler to just
3470                 # create it and then give it a negative value, since the value is bogus
3471                 # anyway.
3472                 #
3473                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3474                 $insertCats = array_merge( $added, $deleted );
3475                 if( !$insertCats ) {
3476                         # Okay, nothing to do
3477                         return;
3478                 }
3479                 $insertRows = array();
3480                 foreach( $insertCats as $cat ) {
3481                         $insertRows[] = array( 'cat_title' => $cat );
3482                 }
3483                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3484
3485                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3486                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3487                 if( $ns == NS_CATEGORY ) {
3488                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3489                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3490                 } elseif( $ns == NS_IMAGE ) {
3491                         $addFields[]    = 'cat_files = cat_files + 1';
3492                         $removeFields[] = 'cat_files = cat_files - 1';
3493                 }
3494
3495                 if ( $added ) {
3496                         $dbw->update(
3497                                 'category',
3498                                 $addFields,
3499                                 array( 'cat_title' => $added ),
3500                                 __METHOD__
3501                         );
3502                 }
3503                 if ( $deleted ) {
3504                         $dbw->update(
3505                                 'category',
3506                                 $removeFields,
3507                                 array( 'cat_title' => $deleted ),
3508                                 __METHOD__
3509                         );
3510                 }
3511         }
3512 }