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