includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61
  62                 return $t == null ? null : new Article( $t );
  63         }
  64
  65         /**
  66          * Tell the page view functions that this view was redirected
  67          * from another page on the wiki.
  68          * @param $from Title object.
  69          */
  70         function setRedirectedFrom( $from ) {
  71                 $this->mRedirectedFrom = $from;
  72         }
  73
  74         /**
  75          * If this page is a redirect, get its target
  76          *
  77          * The target will be fetched from the redirect table if possible.
  78          * If this page doesn't have an entry there, call insertRedirect()
  79          * @return mixed Title object, or null if this page is not a redirect
  80          */
  81         public function getRedirectTarget() {
  82                 if(!$this->mTitle || !$this->mTitle->isRedirect())
  83                         return null;
  84                 if(!is_null($this->mRedirectTarget))
  85                         return $this->mRedirectTarget;
  86
  87                 # Query the redirect table
  88                 $dbr = wfGetDB(DB_SLAVE);
  89                 $res = $dbr->select('redirect',
  90                                 array('rd_namespace', 'rd_title'),
  91                                 array('rd_from' => $this->getID()),
  92                                 __METHOD__
  93                 );
  94                 $row = $dbr->fetchObject($res);
  95                 if($row)
  96                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  97
  98                 # This page doesn't have an entry in the redirect table
  99                 return $this->mRedirectTarget = $this->insertRedirect();
 100         }
 101
 102         /**
 103          * Insert an entry for this page into the redirect table.
 104          *
 105          * Don't call this function directly unless you know what you're doing.
 106          * @return Title object
 107          */
 108         public function insertRedirect() {
 109                 $retval = Title::newFromRedirect($this->getContent());
 110                 if(!$retval)
 111                         return null;
 112                 $dbw = wfGetDB(DB_MASTER);
 113                 $dbw->replace('redirect', array('rd_from'), array(
 114                                 'rd_from' => $this->getID(),
 115                                 'rd_namespace' => $retval->getNamespace(),
 116                                 'rd_title' => $retval->getDBKey()
 117                 ), __METHOD__);
 118                 return $retval;
 119         }
 120
 121         /**
 122          * Get the Title object this page redirects to
 123          *
 124          * @return mixed false, Title of in-wiki target, or string with URL
 125          */
 126         public function followRedirect() {
 127                 $text = $this->getContent();
 128                 return $this->followRedirectText( $text );
 129         }
 130
 131         /**
 132          * Get the Title object this text redirects to
 133          *
 134          * @return mixed false, Title of in-wiki target, or string with URL
 135          */
 136         public function followRedirectText( $text ) {
 137                 $rt = Title::newFromRedirect( $text );
 138                 # process if title object is valid and not special:userlogout
 139                 if( $rt ) {
 140                         if( $rt->getInterwiki() != '' ) {
 141                                 if( $rt->isLocal() ) {
 142                                         // Offsite wikis need an HTTP redirect.
 143                                         //
 144                                         // This can be hard to reverse and may produce loops,
 145                                         // so they may be disabled in the site configuration.
 146
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157
 158                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 159                                                 // rolleyes
 160                                         } else {
 161                                                 return $rt->getFullURL();
 162                                         }
 163                                 }
 164                                 return $rt;
 165                         }
 166                 }
 167                 // No or invalid redirect
 168                 return false;
 169         }
 170
 171         /**
 172          * get the title object of the article
 173          */
 174         function getTitle() {
 175                 return $this->mTitle;
 176         }
 177
 178         /**
 179           * Clear the object
 180           * @private
 181           */
 182         function clear() {
 183                 $this->mDataLoaded    = false;
 184                 $this->mContentLoaded = false;
 185
 186                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 187                 $this->mRedirectedFrom = null; # Title object if set
 188                 $this->mRedirectTarget = null; # Title object if set
 189                 $this->mUserText =
 190                 $this->mTimestamp = $this->mComment = '';
 191                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 192                 $this->mTouched = '19700101000000';
 193                 $this->mForUpdate = false;
 194                 $this->mIsRedirect = false;
 195                 $this->mRevIdFetched = 0;
 196                 $this->mRedirectUrl = false;
 197                 $this->mLatest = false;
 198                 $this->mPreparedEdit = false;
 199         }
 200
 201         /**
 202          * Note that getContent/loadContent do not follow redirects anymore.
 203          * If you need to fetch redirectable content easily, try
 204          * the shortcut in Article::followContent()
 205          * FIXME
 206          * @todo There are still side-effects in this!
 207          *        In general, you should use the Revision class, not Article,
 208          *        to fetch text for purposes other than page views.
 209          *
 210          * @return Return the text of this revision
 211         */
 212         function getContent() {
 213                 global $wgUser, $wgOut, $wgMessageCache;
 214
 215                 wfProfileIn( __METHOD__ );
 216
 217                 if ( 0 == $this->getID() ) {
 218                         wfProfileOut( __METHOD__ );
 219                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
 220
 221                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 222                                 $wgMessageCache->loadAllMessages();
 223                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 224                         } else {
 225                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 226                         }
 227
 228                         return "<div class='noarticletext'>\n$ret\n</div>";
 229                 } else {
 230                         $this->loadContent();
 231                         wfProfileOut( __METHOD__ );
 232                         return $this->mContent;
 233                 }
 234         }
 235
 236         /**
 237          * This function returns the text of a section, specified by a number ($section).
 238          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 239          * the first section before any such heading (section 0).
 240          *
 241          * If a section contains subsections, these are also returned.
 242          *
 243          * @param $text String: text to look in
 244          * @param $section Integer: section number
 245          * @return string text of the requested section
 246          * @deprecated
 247          */
 248         function getSection($text,$section) {
 249                 global $wgParser;
 250                 return $wgParser->getSection( $text, $section );
 251         }
 252
 253         /**
 254          * @return int The oldid of the article that is to be shown, 0 for the
 255          *             current revision
 256          */
 257         function getOldID() {
 258                 if ( is_null( $this->mOldId ) ) {
 259                         $this->mOldId = $this->getOldIDFromRequest();
 260                 }
 261                 return $this->mOldId;
 262         }
 263
 264         /**
 265          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 266          *
 267          * @return int The old id for the request
 268          */
 269         public function getOldIDFromRequest() {
 270                 global $wgRequest;
 271                 $this->mRedirectUrl = false;
 272                 $oldid = $wgRequest->getVal( 'oldid' );
 273                 if ( isset( $oldid ) ) {
 274                         $oldid = intval( $oldid );
 275                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 276                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 277                                 if ( $nextid  ) {
 278                                         $oldid = $nextid;
 279                                 } else {
 280                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 281                                 }
 282                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 283                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 284                                 if ( $previd ) {
 285                                         $oldid = $previd;
 286                                 } else {
 287                                         # TODO
 288                                 }
 289                         }
 290                         # unused:
 291                         # $lastid = $oldid;
 292                 }
 293
 294                 if ( !$oldid ) {
 295                         $oldid = 0;
 296                 }
 297                 return $oldid;
 298         }
 299
 300         /**
 301          * Load the revision (including text) into this object
 302          */
 303         function loadContent() {
 304                 if ( $this->mContentLoaded ) return;
 305
 306                 # Query variables :P
 307                 $oldid = $this->getOldID();
 308
 309                 # Pre-fill content with error message so that if something
 310                 # fails we'll have something telling us what we intended.
 311                 $this->mOldId = $oldid;
 312                 $this->fetchContent( $oldid );
 313         }
 314
 315
 316         /**
 317          * Fetch a page record with the given conditions
 318          * @param Database $dbr
 319          * @param array    $conditions
 320          * @private
 321          */
 322         function pageData( $dbr, $conditions ) {
 323                 $fields = array(
 324                                 'page_id',
 325                                 'page_namespace',
 326                                 'page_title',
 327                                 'page_restrictions',
 328                                 'page_counter',
 329                                 'page_is_redirect',
 330                                 'page_is_new',
 331                                 'page_random',
 332                                 'page_touched',
 333                                 'page_latest',
 334                                 'page_len',
 335                 );
 336                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 337                 $row = $dbr->selectRow(
 338                         'page',
 339                         $fields,
 340                         $conditions,
 341                         __METHOD__
 342                 );
 343                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 344                 return $row ;
 345         }
 346
 347         /**
 348          * @param Database $dbr
 349          * @param Title $title
 350          */
 351         function pageDataFromTitle( $dbr, $title ) {
 352                 return $this->pageData( $dbr, array(
 353                         'page_namespace' => $title->getNamespace(),
 354                         'page_title'     => $title->getDBkey() ) );
 355         }
 356
 357         /**
 358          * @param Database $dbr
 359          * @param int $id
 360          */
 361         function pageDataFromId( $dbr, $id ) {
 362                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 363         }
 364
 365         /**
 366          * Set the general counter, title etc data loaded from
 367          * some source.
 368          *
 369          * @param object $data
 370          * @private
 371          */
 372         function loadPageData( $data = 'fromdb' ) {
 373                 if ( $data === 'fromdb' ) {
 374                         $dbr = wfGetDB( DB_MASTER );
 375                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 376                 }
 377
 378                 $lc = LinkCache::singleton();
 379                 if ( $data ) {
 380                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 381
 382                         $this->mTitle->mArticleID = $data->page_id;
 383
 384                         # Old-fashioned restrictions.
 385                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 386
 387                         $this->mCounter     = $data->page_counter;
 388                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 389                         $this->mIsRedirect  = $data->page_is_redirect;
 390                         $this->mLatest      = $data->page_latest;
 391                 } else {
 392                         if ( is_object( $this->mTitle ) ) {
 393                                 $lc->addBadLinkObj( $this->mTitle );
 394                         }
 395                         $this->mTitle->mArticleID = 0;
 396                 }
 397
 398                 $this->mDataLoaded  = true;
 399         }
 400
 401         /**
 402          * Get text of an article from database
 403          * Does *NOT* follow redirects.
 404          * @param int $oldid 0 for whatever the latest revision is
 405          * @return string
 406          */
 407         function fetchContent( $oldid = 0 ) {
 408                 if ( $this->mContentLoaded ) {
 409                         return $this->mContent;
 410                 }
 411
 412                 $dbr = wfGetDB( DB_MASTER );
 413
 414                 # Pre-fill content with error message so that if something
 415                 # fails we'll have something telling us what we intended.
 416                 $t = $this->mTitle->getPrefixedText();
 417                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 418                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 419
 420                 if( $oldid ) {
 421                         $revision = Revision::newFromId( $oldid );
 422                         if( is_null( $revision ) ) {
 423                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 424                                 return false;
 425                         }
 426                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 427                         if( !$data ) {
 428                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 429                                 return false;
 430                         }
 431                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 432                         $this->loadPageData( $data );
 433                 } else {
 434                         if( !$this->mDataLoaded ) {
 435                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 436                                 if( !$data ) {
 437                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 438                                         return false;
 439                                 }
 440                                 $this->loadPageData( $data );
 441                         }
 442                         $revision = Revision::newFromId( $this->mLatest );
 443                         if( is_null( $revision ) ) {
 444                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 445                                 return false;
 446                         }
 447                 }
 448
 449                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 450                 // We should instead work with the Revision object when we need it...
 451                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 452
 453                 $this->mUser      = $revision->getUser();
 454                 $this->mUserText  = $revision->getUserText();
 455                 $this->mComment   = $revision->getComment();
 456                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 457
 458                 $this->mRevIdFetched = $revision->getId();
 459                 $this->mContentLoaded = true;
 460                 $this->mRevision =& $revision;
 461
 462                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 463
 464                 return $this->mContent;
 465         }
 466
 467         /**
 468          * Read/write accessor to select FOR UPDATE
 469          *
 470          * @param $x Mixed: FIXME
 471          */
 472         function forUpdate( $x = NULL ) {
 473                 return wfSetVar( $this->mForUpdate, $x );
 474         }
 475
 476         /**
 477          * Get the database which should be used for reads
 478          *
 479          * @return Database
 480          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 481          */
 482         function getDB() {
 483                 wfDeprecated( __METHOD__ );
 484                 return wfGetDB( DB_MASTER );
 485         }
 486
 487         /**
 488          * Get options for all SELECT statements
 489          *
 490          * @param $options Array: an optional options array which'll be appended to
 491          *                       the default
 492          * @return Array: options
 493          */
 494         function getSelectOptions( $options = '' ) {
 495                 if ( $this->mForUpdate ) {
 496                         if ( is_array( $options ) ) {
 497                                 $options[] = 'FOR UPDATE';
 498                         } else {
 499                                 $options = 'FOR UPDATE';
 500                         }
 501                 }
 502                 return $options;
 503         }
 504
 505         /**
 506          * @return int Page ID
 507          */
 508         function getID() {
 509                 if( $this->mTitle ) {
 510                         return $this->mTitle->getArticleID();
 511                 } else {
 512                         return 0;
 513                 }
 514         }
 515
 516         /**
 517          * @return bool Whether or not the page exists in the database
 518          */
 519         function exists() {
 520                 return $this->getId() != 0;
 521         }
 522
 523         /**
 524          * @return int The view count for the page
 525          */
 526         function getCount() {
 527                 if ( -1 == $this->mCounter ) {
 528                         $id = $this->getID();
 529                         if ( $id == 0 ) {
 530                                 $this->mCounter = 0;
 531                         } else {
 532                                 $dbr = wfGetDB( DB_SLAVE );
 533                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 534                                         'Article::getCount', $this->getSelectOptions() );
 535                         }
 536                 }
 537                 return $this->mCounter;
 538         }
 539
 540         /**
 541          * Determine whether a page  would be suitable for being counted as an
 542          * article in the site_stats table based on the title & its content
 543          *
 544          * @param $text String: text to analyze
 545          * @return bool
 546          */
 547         function isCountable( $text ) {
 548                 global $wgUseCommaCount;
 549
 550                 $token = $wgUseCommaCount ? ',' : '[[';
 551                 return
 552                         $this->mTitle->isContentPage()
 553                         && !$this->isRedirect( $text )
 554                         && in_string( $token, $text );
 555         }
 556
 557         /**
 558          * Tests if the article text represents a redirect
 559          *
 560          * @param $text String: FIXME
 561          * @return bool
 562          */
 563         function isRedirect( $text = false ) {
 564                 if ( $text === false ) {
 565                         if ( $this->mDataLoaded )
 566                                 return $this->mIsRedirect;
 567
 568                         // Apparently loadPageData was never called
 569                         $this->loadContent();
 570                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 571                 } else {
 572                         $titleObj = Title::newFromRedirect( $text );
 573                 }
 574                 return $titleObj !== NULL;
 575         }
 576
 577         /**
 578          * Returns true if the currently-referenced revision is the current edit
 579          * to this page (and it exists).
 580          * @return bool
 581          */
 582         function isCurrent() {
 583                 # If no oldid, this is the current version.
 584                 if ($this->getOldID() == 0)
 585                         return true;
 586
 587                 return $this->exists() &&
 588                         isset( $this->mRevision ) &&
 589                         $this->mRevision->isCurrent();
 590         }
 591
 592         /**
 593          * Loads everything except the text
 594          * This isn't necessary for all uses, so it's only done if needed.
 595          * @private
 596          */
 597         function loadLastEdit() {
 598                 if ( -1 != $this->mUser )
 599                         return;
 600
 601                 # New or non-existent articles have no user information
 602                 $id = $this->getID();
 603                 if ( 0 == $id ) return;
 604
 605                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 606                 if( !is_null( $this->mLastRevision ) ) {
 607                         $this->mUser      = $this->mLastRevision->getUser();
 608                         $this->mUserText  = $this->mLastRevision->getUserText();
 609                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 610                         $this->mComment   = $this->mLastRevision->getComment();
 611                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 612                         $this->mRevIdFetched = $this->mLastRevision->getId();
 613                 }
 614         }
 615
 616         function getTimestamp() {
 617                 // Check if the field has been filled by ParserCache::get()
 618                 if ( !$this->mTimestamp ) {
 619                         $this->loadLastEdit();
 620                 }
 621                 return wfTimestamp(TS_MW, $this->mTimestamp);
 622         }
 623
 624         function getUser() {
 625                 $this->loadLastEdit();
 626                 return $this->mUser;
 627         }
 628
 629         function getUserText() {
 630                 $this->loadLastEdit();
 631                 return $this->mUserText;
 632         }
 633
 634         function getComment() {
 635                 $this->loadLastEdit();
 636                 return $this->mComment;
 637         }
 638
 639         function getMinorEdit() {
 640                 $this->loadLastEdit();
 641                 return $this->mMinorEdit;
 642         }
 643
 644         function getRevIdFetched() {
 645                 $this->loadLastEdit();
 646                 return $this->mRevIdFetched;
 647         }
 648
 649         /**
 650          * @param $limit Integer: default 0.
 651          * @param $offset Integer: default 0.
 652          */
 653         function getContributors($limit = 0, $offset = 0) {
 654                 # XXX: this is expensive; cache this info somewhere.
 655
 656                 $contribs = array();
 657                 $dbr = wfGetDB( DB_SLAVE );
 658                 $revTable = $dbr->tableName( 'revision' );
 659                 $userTable = $dbr->tableName( 'user' );
 660                 $user = $this->getUser();
 661                 $pageId = $this->getId();
 662
 663                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 664                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 665                         WHERE rev_page = $pageId
 666                         AND rev_user != $user
 667                         GROUP BY rev_user, rev_user_text, user_real_name
 668                         ORDER BY timestamp DESC";
 669
 670                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 671                 if ($offset > 0) { $sql .= ' OFFSET '.$offset; }
 672
 673                 $sql .= ' '. $this->getSelectOptions();
 674
 675                 $res = $dbr->query($sql, __METHOD__ );
 676
 677                 return new UserArrayFromResult( $res );
 678         }
 679
 680         /**
 681          * This is the default action of the script: just view the page of
 682          * the given title.
 683         */
 684         function view() {
 685                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 686                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 687                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 688                 global $wgDefaultRobotPolicy;
 689                 $sk = $wgUser->getSkin();
 690
 691                 wfProfileIn( __METHOD__ );
 692
 693                 $parserCache = ParserCache::singleton();
 694                 $ns = $this->mTitle->getNamespace(); # shortcut
 695
 696                 # Get variables from query string
 697                 $oldid = $this->getOldID();
 698
 699                 # getOldID may want us to redirect somewhere else
 700                 if ( $this->mRedirectUrl ) {
 701                         $wgOut->redirect( $this->mRedirectUrl );
 702                         wfProfileOut( __METHOD__ );
 703                         return;
 704                 }
 705
 706                 $diff = $wgRequest->getVal( 'diff' );
 707                 $rcid = $wgRequest->getVal( 'rcid' );
 708                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 709                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 710                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 711
 712                 $wgOut->setArticleFlag( true );
 713
 714                 # Discourage indexing of printable versions, but encourage following
 715                 if( $wgOut->isPrintable() ) {
 716                         $policy = 'noindex,follow';
 717                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 718                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 719                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 720                         # Honour customised robot policies for this namespace
 721                         $policy = $wgNamespaceRobotPolicies[$ns];
 722                 } else {
 723                         $policy = $wgDefaultRobotPolicy;
 724                 }
 725                 $wgOut->setRobotPolicy( $policy );
 726
 727                 # If we got diff and oldid in the query, we want to see a
 728                 # diff page instead of the article.
 729
 730                 if ( !is_null( $diff ) ) {
 731                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 732
 733                         $diff = $wgRequest->getVal( 'diff' );
 734                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 735                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff);
 736                         // DifferenceEngine directly fetched the revision:
 737                         $this->mRevIdFetched = $de->mNewid;
 738                         $de->showDiffPage( $diffOnly );
 739
 740                         // Needed to get the page's current revision
 741                         $this->loadPageData();
 742                         if( $diff == 0 || $diff == $this->mLatest ) {
 743                                 # Run view updates for current revision only
 744                                 $this->viewUpdates();
 745                         }
 746                         wfProfileOut( __METHOD__ );
 747                         return;
 748                 }
 749
 750                 if ( empty( $oldid ) && $this->checkTouched() ) {
 751                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 752
 753                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 754                                 wfProfileOut( __METHOD__ );
 755                                 return;
 756                         } else if ( $this->tryFileCache() ) {
 757                                 # tell wgOut that output is taken care of
 758                                 $wgOut->disable();
 759                                 $this->viewUpdates();
 760                                 wfProfileOut( __METHOD__ );
 761                                 return;
 762                         }
 763                 }
 764
 765                 # Should the parser cache be used?
 766                 $pcache = $this->useParserCache( $oldid );
 767                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 768                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 769                         wfIncrStats( 'pcache_miss_stub' );
 770                 }
 771
 772                 $wasRedirected = false;
 773                 if ( isset( $this->mRedirectedFrom ) ) {
 774                         // This is an internally redirected page view.
 775                         // We'll need a backlink to the source page for navigation.
 776                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 777                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 778                                 $s = wfMsg( 'redirectedfrom', $redir );
 779                                 $wgOut->setSubtitle( $s );
 780
 781                                 // Set the fragment if one was specified in the redirect
 782                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 783                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 784                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 785                                 }
 786                                 $wasRedirected = true;
 787                         }
 788                 } elseif ( !empty( $rdfrom ) ) {
 789                         // This is an externally redirected view, from some other wiki.
 790                         // If it was reported from a trusted site, supply a backlink.
 791                         global $wgRedirectSources;
 792                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 793                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 794                                 $s = wfMsg( 'redirectedfrom', $redir );
 795                                 $wgOut->setSubtitle( $s );
 796                                 $wasRedirected = true;
 797                         }
 798                 }
 799
 800                 $outputDone = false;
 801                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 802                 if ( $pcache ) {
 803                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 804                                 // Ensure that UI elements requiring revision ID have
 805                                 // the correct version information.
 806                                 $wgOut->setRevisionId( $this->mLatest );
 807                                 $outputDone = true;
 808                         }
 809                 }
 810                 # Fetch content and check for errors
 811                 if ( !$outputDone ) {
 812                         # If the article does not exist and was deleted, show the log
 813                         if ($this->getID() == 0) {
 814                                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
 815                                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
 816                                 $count = $pager->getNumRows();
 817                                 if( $count > 0 ) {
 818                                         $pager->mLimit = 10;
 819                                         $wgOut->addHtml( '<div id="mw-deleted-notice">' );
 820                                         $wgOut->addWikiMsg( 'deleted-notice' );
 821                                         $wgOut->addHTML(
 822                                                 $loglist->beginLogEventsList() .
 823                                                 $pager->getBody() .
 824                                                 $loglist->endLogEventsList()
 825                                         );
 826                                         if($count > 10){
 827                                                 $wgOut->addHtml( $wgUser->getSkin()->link(
 828                                                         SpecialPage::getTitleFor( 'Log' ),
 829                                                         wfMsgHtml( 'deletelog-fulllog' ),
 830                                                         array(),
 831                                                         array(
 832                                                                 'type' => 'delete',
 833                                                                 'page' => $this->mTitle->getPrefixedText() ) ) );
 834                                         }
 835                                         $wgOut->addHtml( '</div>' );
 836                                 }
 837                         }
 838                         $text = $this->getContent();
 839                         if ( $text === false ) {
 840                                 # Failed to load, replace text with error message
 841                                 $t = $this->mTitle->getPrefixedText();
 842                                 if( $oldid ) {
 843                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 844                                         $text = wfMsg( 'missing-article', $t, $d );
 845                                 } else {
 846                                         $text = wfMsg( 'noarticletext' );
 847                                 }
 848                         }
 849
 850                         # Another whitelist check in case oldid is altering the title
 851                         if ( !$this->mTitle->userCanRead() ) {
 852                                 $wgOut->loginToUse();
 853                                 $wgOut->output();
 854                                 wfProfileOut( __METHOD__ );
 855                                 exit;
 856                         }
 857
 858                         # We're looking at an old revision
 859                         if ( !empty( $oldid ) ) {
 860                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 861                                 if( is_null( $this->mRevision ) ) {
 862                                         // FIXME: This would be a nice place to load the 'no such page' text.
 863                                 } else {
 864                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 865                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 866                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 867                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 868                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 869                                                         wfProfileOut( __METHOD__ );
 870                                                         return;
 871                                                 } else {
 872                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 873                                                         // and we are allowed to see...
 874                                                 }
 875                                         }
 876                                 }
 877                         }
 878
 879                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 880
 881                          // Pages containing custom CSS or JavaScript get special treatment
 882                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 883                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 884                                 // Give hooks a chance to customise the output
 885                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 886                                         // Wrap the whole lot in a <pre> and don't parse
 887                                         $m = array();
 888                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 889                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 890                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 891                                         $wgOut->addHtml( "\n</pre>\n" );
 892                                 }
 893                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 894                                 # Don't append the subtitle if this was an old revision
 895                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 896                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 897                                 $wgOut->addParserOutputNoText( $parseout );
 898                         } else if ( $pcache ) {
 899                                 # Display content and save to parser cache
 900                                 $this->outputWikiText( $text );
 901                         } else {
 902                                 # Display content, don't attempt to save to parser cache
 903                                 # Don't show section-edit links on old revisions... this way lies madness.
 904                                 if( !$this->isCurrent() ) {
 905                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 906                                 }
 907                                 # Display content and don't save to parser cache
 908                                 # With timing hack -- TS 2006-07-26
 909                                 $time = -wfTime();
 910                                 $this->outputWikiText( $text, false );
 911                                 $time += wfTime();
 912
 913                                 # Timing hack
 914                                 if ( $time > 3 ) {
 915                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 916                                                 $this->mTitle->getPrefixedDBkey()));
 917                                 }
 918
 919                                 if( !$this->isCurrent() ) {
 920                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 921                                 }
 922                         }
 923                 }
 924                 /* title may have been set from the cache */
 925                 $t = $wgOut->getPageTitle();
 926                 if( empty( $t ) ) {
 927                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 928
 929                         # For the main page, overwrite the <title> element with the con-
 930                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 931                         # that's not empty).
 932                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 933                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 934                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 935                         }
 936                 }
 937
 938                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 939                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 940                         $wgOut->addWikiMsg('anontalkpagetext');
 941                 }
 942
 943                 # If we have been passed an &rcid= parameter, we want to give the user a
 944                 # chance to mark this new article as patrolled.
 945                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 946                         $wgOut->addHTML(
 947                                 "<div class='patrollink'>" .
 948                                         wfMsgHtml( 'markaspatrolledlink',
 949                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 950                                                 "action=markpatrolled&rcid=$rcid" )
 951                                         ) .
 952                                 '</div>'
 953                          );
 954                 }
 955
 956                 # Trackbacks
 957                 if ($wgUseTrackbacks)
 958                         $this->addTrackbacks();
 959
 960                 $this->viewUpdates();
 961                 wfProfileOut( __METHOD__ );
 962         }
 963
 964         /*
 965         * Should the parser cache be used?
 966         */
 967         protected function useParserCache( $oldid ) {
 968                 global $wgUser, $wgEnableParserCache;
 969
 970                 return $wgEnableParserCache
 971                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 972                         && $this->exists()
 973                         && empty( $oldid )
 974                         && !$this->mTitle->isCssOrJsPage()
 975                         && !$this->mTitle->isCssJsSubpage();
 976         }
 977
 978         /**
 979          * View redirect
 980          * @param Title $target Title of destination to redirect
 981          * @param Bool  $appendSubtitle Object[optional]
 982          * @param Bool  $forceKnown Should the image be shown as a bluelink regardless of existence?
 983          */
 984         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 985                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 986
 987                 # Display redirect
 988                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 989                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 990
 991                 if( $appendSubtitle ) {
 992                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 993                 }
 994                 $sk = $wgUser->getSkin();
 995                 if ( $forceKnown )
 996                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 997                 else
 998                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 999
1000                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1001                         '<span class="redirectText">'.$link.'</span>';
1002
1003         }
1004
1005         function addTrackbacks() {
1006                 global $wgOut, $wgUser;
1007
1008                 $dbr = wfGetDB(DB_SLAVE);
1009                 $tbs = $dbr->select(
1010                                 /* FROM   */ 'trackbacks',
1011                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1012                                 /* WHERE  */ array('tb_page' => $this->getID())
1013                 );
1014
1015                 if (!$dbr->numrows($tbs))
1016                         return;
1017
1018                 $tbtext = "";
1019                 while ($o = $dbr->fetchObject($tbs)) {
1020                         $rmvtxt = "";
1021                         if ($wgUser->isAllowed( 'trackback' )) {
1022                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
1023                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1024                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1025                         }
1026                         $tbtext .= "\n";
1027                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1028                                         $o->tb_title,
1029                                         $o->tb_url,
1030                                         $o->tb_ex,
1031                                         $o->tb_name,
1032                                         $rmvtxt);
1033                 }
1034                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
1035         }
1036
1037         function deletetrackback() {
1038                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1039
1040                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
1041                         $wgOut->addWikiMsg( 'sessionfailure' );
1042                         return;
1043                 }
1044
1045                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1046
1047                 if (count($permission_errors)>0)
1048                 {
1049                         $wgOut->showPermissionsErrorPage( $permission_errors );
1050                         return;
1051                 }
1052
1053                 $db = wfGetDB(DB_MASTER);
1054                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1055                 $wgTitle->invalidateCache();
1056                 $wgOut->addWikiMsg('trackbackdeleteok');
1057         }
1058
1059         function render() {
1060                 global $wgOut;
1061
1062                 $wgOut->setArticleBodyOnly(true);
1063                 $this->view();
1064         }
1065
1066         /**
1067          * Handle action=purge
1068          */
1069         function purge() {
1070                 global $wgUser, $wgRequest, $wgOut;
1071
1072                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1073                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1074                                 $this->doPurge();
1075                                 $this->view();
1076                         }
1077                 } else {
1078                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1079                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1080                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1081                         $msg = str_replace( '$1',
1082                                 "<form method=\"post\" action=\"$action\">\n" .
1083                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1084                                 "</form>\n", $msg );
1085
1086                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1087                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1088                         $wgOut->addHTML( $msg );
1089                 }
1090         }
1091
1092         /**
1093          * Perform the actions of a page purging
1094          */
1095         function doPurge() {
1096                 global $wgUseSquid;
1097                 // Invalidate the cache
1098                 $this->mTitle->invalidateCache();
1099
1100                 if ( $wgUseSquid ) {
1101                         // Commit the transaction before the purge is sent
1102                         $dbw = wfGetDB( DB_MASTER );
1103                         $dbw->immediateCommit();
1104
1105                         // Send purge
1106                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1107                         $update->doUpdate();
1108                 }
1109                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1110                         global $wgMessageCache;
1111                         if ( $this->getID() == 0 ) {
1112                                 $text = false;
1113                         } else {
1114                                 $text = $this->getContent();
1115                         }
1116                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1117                 }
1118         }
1119
1120         /**
1121          * Insert a new empty page record for this article.
1122          * This *must* be followed up by creating a revision
1123          * and running $this->updateToLatest( $rev_id );
1124          * or else the record will be left in a funky state.
1125          * Best if all done inside a transaction.
1126          *
1127          * @param Database $dbw
1128          * @return int     The newly created page_id key
1129          * @private
1130          */
1131         function insertOn( $dbw ) {
1132                 wfProfileIn( __METHOD__ );
1133
1134                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1135                 $dbw->insert( 'page', array(
1136                         'page_id'           => $page_id,
1137                         'page_namespace'    => $this->mTitle->getNamespace(),
1138                         'page_title'        => $this->mTitle->getDBkey(),
1139                         'page_counter'      => 0,
1140                         'page_restrictions' => '',
1141                         'page_is_redirect'  => 0, # Will set this shortly...
1142                         'page_is_new'       => 1,
1143                         'page_random'       => wfRandom(),
1144                         'page_touched'      => $dbw->timestamp(),
1145                         'page_latest'       => 0, # Fill this in shortly...
1146                         'page_len'          => 0, # Fill this in shortly...
1147                 ), __METHOD__ );
1148                 $newid = $dbw->insertId();
1149
1150                 $this->mTitle->resetArticleId( $newid );
1151
1152                 wfProfileOut( __METHOD__ );
1153                 return $newid;
1154         }
1155
1156         /**
1157          * Update the page record to point to a newly saved revision.
1158          *
1159          * @param Database $dbw
1160          * @param Revision $revision For ID number, and text used to set
1161                                      length and redirect status fields
1162          * @param int $lastRevision If given, will not overwrite the page field
1163          *                          when different from the currently set value.
1164          *                          Giving 0 indicates the new page flag should
1165          *                          be set on.
1166          * @param bool $lastRevIsRedirect If given, will optimize adding and
1167          *                                                      removing rows in redirect table.
1168          * @return bool true on success, false on failure
1169          * @private
1170          */
1171         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1172                 wfProfileIn( __METHOD__ );
1173
1174                 $text = $revision->getText();
1175                 $rt = Title::newFromRedirect( $text );
1176
1177                 $conditions = array( 'page_id' => $this->getId() );
1178                 if( !is_null( $lastRevision ) ) {
1179                         # An extra check against threads stepping on each other
1180                         $conditions['page_latest'] = $lastRevision;
1181                 }
1182
1183                 $dbw->update( 'page',
1184                         array( /* SET */
1185                                 'page_latest'      => $revision->getId(),
1186                                 'page_touched'     => $dbw->timestamp(),
1187                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1188                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1189                                 'page_len'         => strlen( $text ),
1190                         ),
1191                         $conditions,
1192                         __METHOD__ );
1193
1194                 $result = $dbw->affectedRows() != 0;
1195
1196                 if ($result) {
1197                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1198                 }
1199
1200                 wfProfileOut( __METHOD__ );
1201                 return $result;
1202         }
1203
1204         /**
1205          * Add row to the redirect table if this is a redirect, remove otherwise.
1206          *
1207          * @param Database $dbw
1208          * @param $redirectTitle a title object pointing to the redirect target,
1209          *                                                      or NULL if this is not a redirect
1210          * @param bool $lastRevIsRedirect If given, will optimize adding and
1211          *                                                      removing rows in redirect table.
1212          * @return bool true on success, false on failure
1213          * @private
1214          */
1215         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1216
1217                 // Always update redirects (target link might have changed)
1218                 // Update/Insert if we don't know if the last revision was a redirect or not
1219                 // Delete if changing from redirect to non-redirect
1220                 $isRedirect = !is_null($redirectTitle);
1221                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1222
1223                         wfProfileIn( __METHOD__ );
1224
1225                         if ($isRedirect) {
1226
1227                                 // This title is a redirect, Add/Update row in the redirect table
1228                                 $set = array( /* SET */
1229                                         'rd_namespace' => $redirectTitle->getNamespace(),
1230                                         'rd_title'     => $redirectTitle->getDBkey(),
1231                                         'rd_from'      => $this->getId(),
1232                                 );
1233
1234                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1235                         } else {
1236                                 // This is not a redirect, remove row from redirect table
1237                                 $where = array( 'rd_from' => $this->getId() );
1238                                 $dbw->delete( 'redirect', $where, __METHOD__);
1239                         }
1240
1241                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1242                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1243                         wfProfileOut( __METHOD__ );
1244                         return ( $dbw->affectedRows() != 0 );
1245                 }
1246
1247                 return true;
1248         }
1249
1250         /**
1251          * If the given revision is newer than the currently set page_latest,
1252          * update the page record. Otherwise, do nothing.
1253          *
1254          * @param Database $dbw
1255          * @param Revision $revision
1256          */
1257         function updateIfNewerOn( &$dbw, $revision ) {
1258                 wfProfileIn( __METHOD__ );
1259
1260                 $row = $dbw->selectRow(
1261                         array( 'revision', 'page' ),
1262                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1263                         array(
1264                                 'page_id' => $this->getId(),
1265                                 'page_latest=rev_id' ),
1266                         __METHOD__ );
1267                 if( $row ) {
1268                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1269                                 wfProfileOut( __METHOD__ );
1270                                 return false;
1271                         }
1272                         $prev = $row->rev_id;
1273                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1274                 } else {
1275                         # No or missing previous revision; mark the page as new
1276                         $prev = 0;
1277                         $lastRevIsRedirect = null;
1278                 }
1279
1280                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1281                 wfProfileOut( __METHOD__ );
1282                 return $ret;
1283         }
1284
1285         /**
1286          * @return string Complete article text, or null if error
1287          */
1288         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1289                 wfProfileIn( __METHOD__ );
1290
1291                 if( $section == '' ) {
1292                         // Whole-page edit; let the text through unmolested.
1293                 } else {
1294                         if( is_null( $edittime ) ) {
1295                                 $rev = Revision::newFromTitle( $this->mTitle );
1296                         } else {
1297                                 $dbw = wfGetDB( DB_MASTER );
1298                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1299                         }
1300                         if( is_null( $rev ) ) {
1301                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1302                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1303                                 return null;
1304                         }
1305                         $oldtext = $rev->getText();
1306
1307                         if( $section == 'new' ) {
1308                                 # Inserting a new section
1309                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1310                                 $text = strlen( trim( $oldtext ) ) > 0
1311                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1312                                                 : "{$subject}{$text}";
1313                         } else {
1314                                 # Replacing an existing section; roll out the big guns
1315                                 global $wgParser;
1316                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1317                         }
1318
1319                 }
1320
1321                 wfProfileOut( __METHOD__ );
1322                 return $text;
1323         }
1324
1325         /**
1326          * @deprecated use Article::doEdit()
1327          */
1328         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1329                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1330                         ( $isminor ? EDIT_MINOR : 0 ) |
1331                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1332                         ( $bot ? EDIT_FORCE_BOT : 0 );
1333
1334                 # If this is a comment, add the summary as headline
1335                 if ( $comment && $summary != "" ) {
1336                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1337                 }
1338
1339                 $this->doEdit( $text, $summary, $flags );
1340
1341                 $dbw = wfGetDB( DB_MASTER );
1342                 if ($watchthis) {
1343                         if (!$this->mTitle->userIsWatching()) {
1344                                 $dbw->begin();
1345                                 $this->doWatch();
1346                                 $dbw->commit();
1347                         }
1348                 } else {
1349                         if ( $this->mTitle->userIsWatching() ) {
1350                                 $dbw->begin();
1351                                 $this->doUnwatch();
1352                                 $dbw->commit();
1353                         }
1354                 }
1355                 $this->doRedirect( $this->isRedirect( $text ) );
1356         }
1357
1358         /**
1359          * @deprecated use Article::doEdit()
1360          */
1361         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1362                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1363                         ( $minor ? EDIT_MINOR : 0 ) |
1364                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1365
1366                 $good = $this->doEdit( $text, $summary, $flags );
1367                 if ( $good ) {
1368                         $dbw = wfGetDB( DB_MASTER );
1369                         if ($watchthis) {
1370                                 if (!$this->mTitle->userIsWatching()) {
1371                                         $dbw->begin();
1372                                         $this->doWatch();
1373                                         $dbw->commit();
1374                                 }
1375                         } else {
1376                                 if ( $this->mTitle->userIsWatching() ) {
1377                                         $dbw->begin();
1378                                         $this->doUnwatch();
1379                                         $dbw->commit();
1380                                 }
1381                         }
1382
1383                         $extraQuery = ''; // Give extensions a chance to modify URL query on update
1384                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1385
1386                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1387                 }
1388                 return $good;
1389         }
1390
1391         /**
1392          * Article::doEdit()
1393          *
1394          * Change an existing article or create a new article. Updates RC and all necessary caches,
1395          * optionally via the deferred update array.
1396          *
1397          * $wgUser must be set before calling this function.
1398          *
1399          * @param string $text New text
1400          * @param string $summary Edit summary
1401          * @param integer $flags bitfield:
1402          *      EDIT_NEW
1403          *          Article is known or assumed to be non-existent, create a new one
1404          *      EDIT_UPDATE
1405          *          Article is known or assumed to be pre-existing, update it
1406          *      EDIT_MINOR
1407          *          Mark this edit minor, if the user is allowed to do so
1408          *      EDIT_SUPPRESS_RC
1409          *          Do not log the change in recentchanges
1410          *      EDIT_FORCE_BOT
1411          *          Mark the edit a "bot" edit regardless of user rights
1412          *      EDIT_DEFER_UPDATES
1413          *          Defer some of the updates until the end of index.php
1414          *      EDIT_AUTOSUMMARY
1415          *          Fill in blank summaries with generated text where possible
1416          *
1417          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1418          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1419          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1420          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1421          * to MediaWiki's performance-optimised locking strategy.
1422          * @param $baseRevId, the revision ID this edit was based off, if any
1423          *
1424          * @return int Current revision ID after this edit
1425          */
1426         function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1427                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1428
1429                 # Low-level sanity check
1430                 if( $this->mTitle->getText() == '' ) {
1431                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1432                 }
1433
1434                 wfProfileIn( __METHOD__ );
1435
1436                 if ($user == null) {
1437                         $user = $wgUser;
1438                 }
1439                 $good = true;
1440
1441                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1442                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1443                         if ( $aid ) {
1444                                 $flags |= EDIT_UPDATE;
1445                         } else {
1446                                 $flags |= EDIT_NEW;
1447                         }
1448                 }
1449
1450                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text,
1451                         &$summary, $flags & EDIT_MINOR,
1452                         null, null, &$flags ) ) )
1453                 {
1454                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1455                         wfProfileOut( __METHOD__ );
1456                         return false;
1457                 }
1458
1459                 # Silently ignore EDIT_MINOR if not allowed
1460                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1461                 $bot = $flags & EDIT_FORCE_BOT;
1462
1463                 $oldtext = $this->getContent();
1464                 $oldsize = strlen( $oldtext );
1465
1466                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1467                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1468                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1469                 }
1470
1471                 $editInfo = $this->prepareTextForEdit( $text );
1472                 $text = $editInfo->pst;
1473                 $newsize = strlen( $text );
1474
1475                 $dbw = wfGetDB( DB_MASTER );
1476                 $now = wfTimestampNow();
1477
1478                 if ( $flags & EDIT_UPDATE ) {
1479                         # Update article, but only if changed.
1480
1481                         # Make sure the revision is either completely inserted or not inserted at all
1482                         if( !$wgDBtransactions ) {
1483                                 $userAbort = ignore_user_abort( true );
1484                         }
1485
1486                         $lastRevision = 0;
1487                         $revisionId = 0;
1488
1489                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1490
1491                         if ( $changed ) {
1492                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1493                                   - (int)$this->isCountable( $oldtext );
1494                                 $this->mTotalAdjustment = 0;
1495
1496                                 $lastRevision = $dbw->selectField(
1497                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1498
1499                                 if ( !$lastRevision ) {
1500                                         # Article gone missing
1501                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1502                                         wfProfileOut( __METHOD__ );
1503                                         return false;
1504                                 }
1505
1506                                 $revision = new Revision( array(
1507                                         'page'       => $this->getId(),
1508                                         'comment'    => $summary,
1509                                         'minor_edit' => $isminor,
1510                                         'text'       => $text,
1511                                         'parent_id'  => $lastRevision,
1512                                         'user'       => $user->getId(),
1513                                         'user_text'  => $user->getName(),
1514                                         ) );
1515
1516                                 $dbw->begin();
1517                                 $revisionId = $revision->insertOn( $dbw );
1518
1519                                 # Update page
1520                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1521
1522                                 if( !$ok ) {
1523                                         /* Belated edit conflict! Run away!! */
1524                                         $good = false;
1525                                         $revisionId = 0;
1526                                         $dbw->rollback();
1527                                 } else {
1528                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId ) );
1529
1530                                         # Update recentchanges
1531                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1532                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1533                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1534                                                         $revisionId );
1535
1536                                                 # Mark as patrolled if the user can do so
1537                                                 if( $GLOBALS['wgUseRCPatrol'] && $user->isAllowed( 'autopatrol' ) ) {
1538                                                         RecentChange::markPatrolled( $rc, true );
1539                                                 }
1540                                         }
1541                                         $user->incEditCount();
1542                                         $dbw->commit();
1543                                 }
1544                         } else {
1545                                 $revision = null;
1546                                 // Keep the same revision ID, but do some updates on it
1547                                 $revisionId = $this->getRevIdFetched();
1548                                 // Update page_touched, this is usually implicit in the page update
1549                                 // Other cache updates are done in onArticleEdit()
1550                                 $this->mTitle->invalidateCache();
1551                         }
1552
1553                         if( !$wgDBtransactions ) {
1554                                 ignore_user_abort( $userAbort );
1555                         }
1556
1557                         if ( $good ) {
1558                                 # Invalidate cache of this article and all pages using this article
1559                                 # as a template. Partly deferred.
1560                                 Article::onArticleEdit( $this->mTitle, false ); // leave templatelinks for editUpdates()
1561                                 # Update links tables, site stats, etc.
1562                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1563                         }
1564                 } else {
1565                         # Create new article
1566
1567                         # Set statistics members
1568                         # We work out if it's countable after PST to avoid counter drift
1569                         # when articles are created with {{subst:}}
1570                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1571                         $this->mTotalAdjustment = 1;
1572
1573                         $dbw->begin();
1574                         # Add the page record; stake our claim on this title!
1575                         # This will fail with a database query exception if the article already exists
1576                         $newid = $this->insertOn( $dbw );
1577
1578                         # Save the revision text...
1579                         $revision = new Revision( array(
1580                                 'page'       => $newid,
1581                                 'comment'    => $summary,
1582                                 'minor_edit' => $isminor,
1583                                 'text'       => $text,
1584                                 'user'       => $user->getId(),
1585                                 'user_text'  => $user->getName(),
1586                                 ) );
1587                         $revisionId = $revision->insertOn( $dbw );
1588
1589                         $this->mTitle->resetArticleID( $newid );
1590
1591                         # Update the page record with revision data
1592                         $this->updateRevisionOn( $dbw, $revision, 0 );
1593
1594                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
1595
1596                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1597                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1598                                   '', strlen( $text ), $revisionId );
1599                                 # Mark as patrolled if the user can
1600                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $user->isAllowed( 'autopatrol' ) ) {
1601                                         RecentChange::markPatrolled( $rc, true );
1602                                 }
1603                         }
1604                         $user->incEditCount();
1605                         $dbw->commit();
1606
1607                         # Update links, etc.
1608                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1609
1610                         # Clear caches
1611                         Article::onArticleCreate( $this->mTitle );
1612
1613                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1614                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1615                 }
1616
1617                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1618                         wfDoUpdates();
1619                 }
1620
1621                 if ( $good ) {
1622                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1623                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1624                 }
1625
1626                 wfProfileOut( __METHOD__ );
1627                 return $revisionId;
1628         }
1629
1630         /**
1631          * @deprecated wrapper for doRedirect
1632          */
1633         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1634                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1635         }
1636
1637         /**
1638          * Output a redirect back to the article.
1639          * This is typically used after an edit.
1640          *
1641          * @param boolean $noRedir Add redirect=no
1642          * @param string $sectionAnchor section to redirect to, including "#"
1643          * @param string $extraQuery, extra query params
1644          */
1645         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1646                 global $wgOut;
1647                 if ( $noRedir ) {
1648                         $query = 'redirect=no';
1649                         if( $extraQuery )
1650                                 $query .= "&$query";
1651                 } else {
1652                         $query = $extraQuery;
1653                 }
1654                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1655         }
1656
1657         /**
1658          * Mark this particular edit/page as patrolled
1659          */
1660         function markpatrolled() {
1661                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1662                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1663
1664                 # If we haven't been given an rc_id value, we can't do anything
1665                 $rcid = (int) $wgRequest->getVal('rcid');
1666                 $rc = RecentChange::newFromId($rcid);
1667                 if ( is_null($rc) ) {
1668                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1669                         return;
1670                 }
1671
1672                 #It would be nice to see where the user had actually come from, but for now just guess
1673                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1674                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1675
1676                 $dbw = wfGetDB( DB_MASTER );
1677                 $errors = $rc->doMarkPatrolled();
1678
1679                 if ( in_array(array('rcpatroldisabled'), $errors) ) {
1680                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1681                         return;
1682                 }
1683
1684                 if ( in_array(array('hookaborted'), $errors) ) {
1685                         // The hook itself has handled any output
1686                         return;
1687                 }
1688
1689                 if ( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1690                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1691                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1692                         $wgOut->returnToMain( false, $return );
1693                         return;
1694                 }
1695
1696                 if ( !empty($errors) ) {
1697                         $wgOut->showPermissionsErrorPage( $errors );
1698                         return;
1699                 }
1700
1701                 # Inform the user
1702                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1703                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1704                 $wgOut->returnToMain( false, $return );
1705         }
1706
1707         /**
1708          * User-interface handler for the "watch" action
1709          */
1710
1711         function watch() {
1712
1713                 global $wgUser, $wgOut;
1714
1715                 if ( $wgUser->isAnon() ) {
1716                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1717                         return;
1718                 }
1719                 if ( wfReadOnly() ) {
1720                         $wgOut->readOnlyPage();
1721                         return;
1722                 }
1723
1724                 if( $this->doWatch() ) {
1725                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1726                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1727
1728                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1729                 }
1730
1731                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1732         }
1733
1734         /**
1735          * Add this page to $wgUser's watchlist
1736          * @return bool true on successful watch operation
1737          */
1738         function doWatch() {
1739                 global $wgUser;
1740                 if( $wgUser->isAnon() ) {
1741                         return false;
1742                 }
1743
1744                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1745                         $wgUser->addWatch( $this->mTitle );
1746
1747                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1748                 }
1749
1750                 return false;
1751         }
1752
1753         /**
1754          * User interface handler for the "unwatch" action.
1755          */
1756         function unwatch() {
1757
1758                 global $wgUser, $wgOut;
1759
1760                 if ( $wgUser->isAnon() ) {
1761                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1762                         return;
1763                 }
1764                 if ( wfReadOnly() ) {
1765                         $wgOut->readOnlyPage();
1766                         return;
1767                 }
1768
1769                 if( $this->doUnwatch() ) {
1770                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1771                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1772
1773                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1774                 }
1775
1776                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1777         }
1778
1779         /**
1780          * Stop watching a page
1781          * @return bool true on successful unwatch
1782          */
1783         function doUnwatch() {
1784                 global $wgUser;
1785                 if( $wgUser->isAnon() ) {
1786                         return false;
1787                 }
1788
1789                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1790                         $wgUser->removeWatch( $this->mTitle );
1791
1792                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1793                 }
1794
1795                 return false;
1796         }
1797
1798         /**
1799          * action=protect handler
1800          */
1801         function protect() {
1802                 $form = new ProtectionForm( $this );
1803                 $form->execute();
1804         }
1805
1806         /**
1807          * action=unprotect handler (alias)
1808          */
1809         function unprotect() {
1810                 $this->protect();
1811         }
1812
1813         /**
1814          * Update the article's restriction field, and leave a log entry.
1815          *
1816          * @param array $limit set of restriction keys
1817          * @param string $reason
1818          * @return bool true on success
1819          */
1820         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = array() ) {
1821                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1822
1823                 $id = $this->mTitle->getArticleID();
1824                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1825                         return false;
1826                 }
1827
1828                 if( !$cascade ) {
1829                         $cascade = false;
1830                 }
1831
1832                 // Take this opportunity to purge out expired restrictions
1833                 Title::purgeExpiredRestrictions();
1834
1835                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1836                 # we expect a single selection, but the schema allows otherwise.
1837                 $current = array();
1838                 $updated = Article::flattenRestrictions( $limit );
1839                 $changed = false;
1840                 foreach( $wgRestrictionTypes as $action ) {
1841                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1842                         $changed = ($changed || ($this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action]) );
1843                 }
1844
1845                 $current = Article::flattenRestrictions( $current );
1846
1847                 $changed = ($changed || ( $current != $updated ) );
1848                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1849                 $protect = ( $updated != '' );
1850
1851                 # If nothing's changed, do nothing
1852                 if( $changed ) {
1853                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1854
1855                                 $dbw = wfGetDB( DB_MASTER );
1856
1857                                 # Prepare a null revision to be added to the history
1858                                 $modified = $current != '' && $protect;
1859                                 if( $protect ) {
1860                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1861                                 } else {
1862                                         $comment_type = 'unprotectedarticle';
1863                                 }
1864                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1865
1866                                 # Only restrictions with the 'protect' right can cascade...
1867                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1868                                 foreach( $limit as $action => $restriction ) {
1869                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1870                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1871                                                 $cascade = false;
1872                                                 break;
1873                                         }
1874                                 }
1875                                 $cascade_description = '';
1876                                 if( $cascade ) {
1877                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
1878                                 }
1879
1880                                 if( $reason )
1881                                         $comment .= ": $reason";
1882
1883                                 $editComment = $comment;
1884                                 $encodedExpiry = array();
1885                                 $protect_description = '';
1886                                 foreach( $limit as $action => $restrictions  ) {
1887                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
1888                                         if( $restrictions != '' ) {
1889                                                 $protect_description .= "[$action=$restrictions] (";
1890                                                 if( $encodedExpiry[$action] != 'infinity' ) {
1891                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1892                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) );
1893                                                 } else {
1894                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1895                                                 }
1896                                                 $protect_description .= ') ';
1897                                         }
1898                                 }
1899                                 $protect_description = trim($protect_description);
1900
1901                                 if( $protect_description && $protect )
1902                                         $editComment .= " ($protect_description)";
1903                                 if( $cascade )
1904                                         $editComment .= "$cascade_description";
1905                                 # Update restrictions table
1906                                 foreach( $limit as $action => $restrictions ) {
1907                                         if ($restrictions != '' ) {
1908                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1909                                                         array( 'pr_page' => $id,
1910                                                                 'pr_type' => $action,
1911                                                                 'pr_level' => $restrictions,
1912                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
1913                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
1914                                         } else {
1915                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1916                                                         'pr_type' => $action ), __METHOD__ );
1917                                         }
1918                                 }
1919
1920                                 # Insert a null revision
1921                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1922                                 $nullRevId = $nullRevision->insertOn( $dbw );
1923
1924                                 $latest = $this->getLatest();
1925                                 # Update page record
1926                                 $dbw->update( 'page',
1927                                         array( /* SET */
1928                                                 'page_touched' => $dbw->timestamp(),
1929                                                 'page_restrictions' => '',
1930                                                 'page_latest' => $nullRevId
1931                                         ), array( /* WHERE */
1932                                                 'page_id' => $id
1933                                         ), 'Article::protect'
1934                                 );
1935
1936                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest) );
1937                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1938
1939                                 # Update the protection log
1940                                 $log = new LogPage( 'protect' );
1941                                 if( $protect ) {
1942                                         $params = array($protect_description,$cascade ? 'cascade' : '');
1943                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
1944                                 } else {
1945                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1946                                 }
1947
1948                         } # End hook
1949                 } # End "changed" check
1950
1951                 return true;
1952         }
1953
1954         /**
1955          * Take an array of page restrictions and flatten it to a string
1956          * suitable for insertion into the page_restrictions field.
1957          * @param array $limit
1958          * @return string
1959          * @private
1960          */
1961         function flattenRestrictions( $limit ) {
1962                 if( !is_array( $limit ) ) {
1963                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1964                 }
1965                 $bits = array();
1966                 ksort( $limit );
1967                 foreach( $limit as $action => $restrictions ) {
1968                         if( $restrictions != '' ) {
1969                                 $bits[] = "$action=$restrictions";
1970                         }
1971                 }
1972                 return implode( ':', $bits );
1973         }
1974
1975         /**
1976          * Auto-generates a deletion reason
1977          * @param bool &$hasHistory Whether the page has a history
1978          */
1979         public function generateReason( &$hasHistory ) {
1980                 global $wgContLang;
1981                 $dbw = wfGetDB( DB_MASTER );
1982                 // Get the last revision
1983                 $rev = Revision::newFromTitle( $this->mTitle );
1984                 if( is_null( $rev ) )
1985                         return false;
1986
1987                 // Get the article's contents
1988                 $contents = $rev->getText();
1989                 $blank = false;
1990                 // If the page is blank, use the text from the previous revision,
1991                 // which can only be blank if there's a move/import/protect dummy revision involved
1992                 if( $contents == '' ) {
1993                         $prev = $rev->getPrevious();
1994                         if( $prev )     {
1995                                 $contents = $prev->getText();
1996                                 $blank = true;
1997                         }
1998                 }
1999
2000                 // Find out if there was only one contributor
2001                 // Only scan the last 20 revisions
2002                 $limit = 20;
2003                 $res = $dbw->select( 'revision', 'rev_user_text',
2004                         array( 'rev_page' => $this->getID() ), __METHOD__,
2005                         array( 'LIMIT' => $limit )
2006                 );
2007                 if( $res === false )
2008                         // This page has no revisions, which is very weird
2009                         return false;
2010                 if( $res->numRows() > 1 )
2011                                 $hasHistory = true;
2012                 else
2013                                 $hasHistory = false;
2014                 $row = $dbw->fetchObject( $res );
2015                 $onlyAuthor = $row->rev_user_text;
2016                 // Try to find a second contributor
2017                 foreach( $res as $row ) {
2018                         if( $row->rev_user_text != $onlyAuthor ) {
2019                                 $onlyAuthor = false;
2020                                 break;
2021                         }
2022                 }
2023                 $dbw->freeResult( $res );
2024
2025                 // Generate the summary with a '$1' placeholder
2026                 if( $blank ) {
2027                         // The current revision is blank and the one before is also
2028                         // blank. It's just not our lucky day
2029                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2030                 } else {
2031                         if( $onlyAuthor )
2032                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2033                         else
2034                                 $reason = wfMsgForContent( 'excontent', '$1' );
2035                 }
2036
2037                 // Replace newlines with spaces to prevent uglyness
2038                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2039                 // Calculate the maximum amount of chars to get
2040                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2041                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2042                 $contents = $wgContLang->truncate( $contents, $maxLength, '...' );
2043                 // Remove possible unfinished links
2044                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2045                 // Now replace the '$1' placeholder
2046                 $reason = str_replace( '$1', $contents, $reason );
2047                 return $reason;
2048         }
2049
2050
2051         /*
2052          * UI entry point for page deletion
2053          */
2054         function delete() {
2055                 global $wgUser, $wgOut, $wgRequest;
2056
2057                 $confirm = $wgRequest->wasPosted() &&
2058                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2059
2060                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2061                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2062
2063                 $reason = $this->DeleteReasonList;
2064
2065                 if ( $reason != 'other' && $this->DeleteReason != '') {
2066                         // Entry from drop down menu + additional comment
2067                         $reason .= ': ' . $this->DeleteReason;
2068                 } elseif ( $reason == 'other' ) {
2069                         $reason = $this->DeleteReason;
2070                 }
2071                 # Flag to hide all contents of the archived revisions
2072                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2073
2074                 # This code desperately needs to be totally rewritten
2075
2076                 # Read-only check...
2077                 if ( wfReadOnly() ) {
2078                         $wgOut->readOnlyPage();
2079                         return;
2080                 }
2081
2082                 # Check permissions
2083                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2084
2085                 if (count($permission_errors)>0) {
2086                         $wgOut->showPermissionsErrorPage( $permission_errors );
2087                         return;
2088                 }
2089
2090                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2091
2092                 # Better double-check that it hasn't been deleted yet!
2093                 $dbw = wfGetDB( DB_MASTER );
2094                 $conds = $this->mTitle->pageCond();
2095                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2096                 if ( $latest === false ) {
2097                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2098                         return;
2099                 }
2100
2101                 # Hack for big sites
2102                 $bigHistory = $this->isBigDeletion();
2103                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2104                         global $wgLang, $wgDeleteRevisionsLimit;
2105                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2106                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2107                         return;
2108                 }
2109
2110                 if( $confirm ) {
2111                         $this->doDelete( $reason, $suppress );
2112                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2113                                 $this->doWatch();
2114                         } elseif( $this->mTitle->userIsWatching() ) {
2115                                 $this->doUnwatch();
2116                         }
2117                         return;
2118                 }
2119
2120                 // Generate deletion reason
2121                 $hasHistory = false;
2122                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2123
2124                 // If the page has a history, insert a warning
2125                 if( $hasHistory && !$confirm ) {
2126                         $skin=$wgUser->getSkin();
2127                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2128                         if( $bigHistory ) {
2129                                 global $wgLang, $wgDeleteRevisionsLimit;
2130                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2131                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2132                         }
2133                 }
2134
2135                 return $this->confirmDelete( $reason );
2136         }
2137
2138         /**
2139          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2140          */
2141         function isBigDeletion() {
2142                 global $wgDeleteRevisionsLimit;
2143                 if( $wgDeleteRevisionsLimit ) {
2144                         $revCount = $this->estimateRevisionCount();
2145                         return $revCount > $wgDeleteRevisionsLimit;
2146                 }
2147                 return false;
2148         }
2149
2150         /**
2151          * @return int approximate revision count
2152          */
2153         function estimateRevisionCount() {
2154                 $dbr = wfGetDB( DB_SLAVE );
2155                 // For an exact count...
2156                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2157                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2158                 return $dbr->estimateRowCount( 'revision', '*',
2159                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2160         }
2161
2162         /**
2163          * Get the last N authors
2164          * @param int $num Number of revisions to get
2165          * @param string $revLatest The latest rev_id, selected from the master (optional)
2166          * @return array Array of authors, duplicates not removed
2167          */
2168         function getLastNAuthors( $num, $revLatest = 0 ) {
2169                 wfProfileIn( __METHOD__ );
2170
2171                 // First try the slave
2172                 // If that doesn't have the latest revision, try the master
2173                 $continue = 2;
2174                 $db = wfGetDB( DB_SLAVE );
2175                 do {
2176                         $res = $db->select( array( 'page', 'revision' ),
2177                                 array( 'rev_id', 'rev_user_text' ),
2178                                 array(
2179                                         'page_namespace' => $this->mTitle->getNamespace(),
2180                                         'page_title' => $this->mTitle->getDBkey(),
2181                                         'rev_page = page_id'
2182                                 ), __METHOD__, $this->getSelectOptions( array(
2183                                         'ORDER BY' => 'rev_timestamp DESC',
2184                                         'LIMIT' => $num
2185                                 ) )
2186                         );
2187                         if ( !$res ) {
2188                                 wfProfileOut( __METHOD__ );
2189                                 return array();
2190                         }
2191                         $row = $db->fetchObject( $res );
2192                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2193                                 $db = wfGetDB( DB_MASTER );
2194                                 $continue--;
2195                         } else {
2196                                 $continue = 0;
2197                         }
2198                 } while ( $continue );
2199
2200                 $authors = array( $row->rev_user_text );
2201                 while ( $row = $db->fetchObject( $res ) ) {
2202                         $authors[] = $row->rev_user_text;
2203                 }
2204                 wfProfileOut( __METHOD__ );
2205                 return $authors;
2206         }
2207
2208         /**
2209          * Output deletion confirmation dialog
2210          * @param $reason string Prefilled reason
2211          */
2212         function confirmDelete( $reason ) {
2213                 global $wgOut, $wgUser, $wgContLang;
2214                 $align = $wgContLang->isRtl() ? 'left' : 'right';
2215
2216                 wfDebug( "Article::confirmDelete\n" );
2217
2218                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2219                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2220                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2221
2222                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2223                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\"><td></td><td>";
2224                         $suppress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2225                         $suppress .= "</td></tr>";
2226                 } else {
2227                         $suppress = '';
2228                 }
2229                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2230
2231                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2232                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2233                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2234                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2235                         Xml::openElement( 'table' ) .
2236                         "<tr id=\"wpDeleteReasonListRow\">
2237                                 <td align='$align'>" .
2238                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2239                                 "</td>
2240                                 <td>" .
2241                                         Xml::listDropDown( 'wpDeleteReasonList',
2242                                                 wfMsgForContent( 'deletereason-dropdown' ),
2243                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2244                                 "</td>
2245                         </tr>
2246                         <tr id=\"wpDeleteReasonRow\">
2247                                 <td align='$align'>" .
2248                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2249                                 "</td>
2250                                 <td>" .
2251                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2252                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2253                                 "</td>
2254                         </tr>
2255                         <tr>
2256                                 <td></td>
2257                                 <td>" .
2258                                         Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2259                                 "</td>
2260                         </tr>
2261                         $suppress
2262                         <tr>
2263                                 <td></td>
2264                                 <td>" .
2265                                         Xml::submitButton( wfMsg( 'deletepage' ), array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '4' ) ) .
2266                                 "</td>
2267                         </tr>" .
2268                         Xml::closeElement( 'table' ) .
2269                         Xml::closeElement( 'fieldset' ) .
2270                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2271                         Xml::closeElement( 'form' );
2272
2273                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2274                                 $skin = $wgUser->getSkin();
2275                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2276                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2277                         }
2278
2279                 $wgOut->addHTML( $form );
2280                 $this->showLogExtract( $wgOut );
2281         }
2282
2283
2284         /**
2285          * Show relevant lines from the deletion log
2286          */
2287         function showLogExtract( $out ) {
2288                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2289                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2290         }
2291
2292
2293         /**
2294          * Perform a deletion and output success or failure messages
2295          */
2296         function doDelete( $reason, $suppress = false ) {
2297                 global $wgOut, $wgUser;
2298                 wfDebug( __METHOD__."\n" );
2299
2300                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2301
2302                 $error = '';
2303
2304                 if ( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2305                         if ( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2306                                 $deleted = $this->mTitle->getPrefixedText();
2307
2308                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2309                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2310
2311                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2312
2313                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2314                                 $wgOut->returnToMain( false );
2315                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2316                         } else {
2317                                 if ($error = '')
2318                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2319                                 else
2320                                         $wgOut->showFatalError( $error );
2321                         }
2322                 }
2323         }
2324
2325         /**
2326          * Back-end article deletion
2327          * Deletes the article with database consistency, writes logs, purges caches
2328          * Returns success
2329          */
2330         function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2331                 global $wgUseSquid, $wgDeferredUpdateList;
2332                 global $wgUseTrackbacks;
2333
2334                 wfDebug( __METHOD__."\n" );
2335
2336                 $dbw = wfGetDB( DB_MASTER );
2337                 $ns = $this->mTitle->getNamespace();
2338                 $t = $this->mTitle->getDBkey();
2339                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2340
2341                 if ( $t == '' || $id == 0 ) {
2342                         return false;
2343                 }
2344
2345                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2346                 array_push( $wgDeferredUpdateList, $u );
2347
2348                 // Bitfields to further suppress the content
2349                 if ( $suppress ) {
2350                         $bitfield = 0;
2351                         // This should be 15...
2352                         $bitfield |= Revision::DELETED_TEXT;
2353                         $bitfield |= Revision::DELETED_COMMENT;
2354                         $bitfield |= Revision::DELETED_USER;
2355                         $bitfield |= Revision::DELETED_RESTRICTED;
2356                 } else {
2357                         $bitfield = 'rev_deleted';
2358                 }
2359
2360                 $dbw->begin();
2361                 // For now, shunt the revision data into the archive table.
2362                 // Text is *not* removed from the text table; bulk storage
2363                 // is left intact to avoid breaking block-compression or
2364                 // immutable storage schemes.
2365                 //
2366                 // For backwards compatibility, note that some older archive
2367                 // table entries will have ar_text and ar_flags fields still.
2368                 //
2369                 // In the future, we may keep revisions and mark them with
2370                 // the rev_deleted field, which is reserved for this purpose.
2371                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2372                         array(
2373                                 'ar_namespace'  => 'page_namespace',
2374                                 'ar_title'      => 'page_title',
2375                                 'ar_comment'    => 'rev_comment',
2376                                 'ar_user'       => 'rev_user',
2377                                 'ar_user_text'  => 'rev_user_text',
2378                                 'ar_timestamp'  => 'rev_timestamp',
2379                                 'ar_minor_edit' => 'rev_minor_edit',
2380                                 'ar_rev_id'     => 'rev_id',
2381                                 'ar_text_id'    => 'rev_text_id',
2382                                 'ar_text'       => '\'\'', // Be explicit to appease
2383                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2384                                 'ar_len'        => 'rev_len',
2385                                 'ar_page_id'    => 'page_id',
2386                                 'ar_deleted'    => $bitfield
2387                         ), array(
2388                                 'page_id' => $id,
2389                                 'page_id = rev_page'
2390                         ), __METHOD__
2391                 );
2392
2393                 # Delete restrictions for it
2394                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2395
2396                 # Now that it's safely backed up, delete it
2397                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2398                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2399                 if( !$ok ) {
2400                         $dbw->rollback();
2401                         return false;
2402                 }
2403
2404                 # If using cascading deletes, we can skip some explicit deletes
2405                 if ( !$dbw->cascadingDeletes() ) {
2406                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2407
2408                         if ($wgUseTrackbacks)
2409                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2410
2411                         # Delete outgoing links
2412                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2413                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2414                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2415                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2416                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2417                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2418                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2419                 }
2420
2421                 # If using cleanup triggers, we can skip some manual deletes
2422                 if ( !$dbw->cleanupTriggers() ) {
2423                         # Clean up recentchanges entries...
2424                         $dbw->delete( 'recentchanges',
2425                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2426                                 __METHOD__ );
2427                 }
2428
2429                 # Clear caches
2430                 Article::onArticleDelete( $this->mTitle );
2431
2432                 # Fix category table counts
2433                 $cats = array();
2434                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2435                 foreach( $res as $row ) {
2436                         $cats []= $row->cl_to;
2437                 }
2438                 $this->updateCategoryCounts( array(), $cats );
2439
2440                 # Clear the cached article id so the interface doesn't act like we exist
2441                 $this->mTitle->resetArticleID( 0 );
2442                 $this->mTitle->mArticleID = 0;
2443
2444                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2445                 $logtype = $suppress ? 'suppress' : 'delete';
2446                 $log = new LogPage( $logtype );
2447
2448                 # Make sure logging got through
2449                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2450
2451                 $dbw->commit();
2452
2453                 return true;
2454         }
2455
2456         /**
2457          * Roll back the most recent consecutive set of edits to a page
2458          * from the same user; fails if there are no eligible edits to
2459          * roll back to, e.g. user is the sole contributor. This function
2460          * performs permissions checks on $wgUser, then calls commitRollback()
2461          * to do the dirty work
2462          *
2463          * @param string $fromP - Name of the user whose edits to rollback.
2464          * @param string $summary - Custom summary. Set to default summary if empty.
2465          * @param string $token - Rollback token.
2466          * @param bool   $bot - If true, mark all reverted edits as bot.
2467          *
2468          * @param array $resultDetails contains result-specific array of additional values
2469          *    'alreadyrolled' : 'current' (rev)
2470          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2471          *
2472          * @return array of errors, each error formatted as
2473          *   array(messagekey, param1, param2, ...).
2474          * On success, the array is empty.  This array can also be passed to
2475          * OutputPage::showPermissionsErrorPage().
2476          */
2477         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2478                 global $wgUser;
2479                 $resultDetails = null;
2480
2481                 # Check permissions
2482                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2483                         $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2484                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2485                         $errors[] = array( 'sessionfailure' );
2486
2487                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2488                         $errors[] = array( 'actionthrottledtext' );
2489                 }
2490                 # If there were errors, bail out now
2491                 if(!empty($errors))
2492                         return $errors;
2493
2494                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2495         }
2496
2497         /**
2498          * Backend implementation of doRollback(), please refer there for parameter
2499          * and return value documentation
2500          *
2501          * NOTE: This function does NOT check ANY permissions, it just commits the
2502          * rollback to the DB Therefore, you should only call this function direct-
2503          * ly if you want to use custom permissions checks. If you don't, use
2504          * doRollback() instead.
2505          */
2506         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2507                 global $wgUseRCPatrol, $wgUser, $wgLang;
2508                 $dbw = wfGetDB( DB_MASTER );
2509
2510                 if( wfReadOnly() ) {
2511                         return array( array( 'readonlytext' ) );
2512                 }
2513
2514                 # Get the last editor
2515                 $current = Revision::newFromTitle( $this->mTitle );
2516                 if( is_null( $current ) ) {
2517                         # Something wrong... no page?
2518                         return array(array('notanarticle'));
2519                 }
2520
2521                 $from = str_replace( '_', ' ', $fromP );
2522                 if( $from != $current->getUserText() ) {
2523                         $resultDetails = array( 'current' => $current );
2524                         return array(array('alreadyrolled',
2525                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2526                                 htmlspecialchars($fromP),
2527                                 htmlspecialchars($current->getUserText())
2528                         ));
2529                 }
2530
2531                 # Get the last edit not by this guy
2532                 $user = intval( $current->getUser() );
2533                 $user_text = $dbw->addQuotes( $current->getUserText() );
2534                 $s = $dbw->selectRow( 'revision',
2535                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2536                         array(  'rev_page' => $current->getPage(),
2537                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2538                         ), __METHOD__,
2539                         array(  'USE INDEX' => 'page_timestamp',
2540                                 'ORDER BY'  => 'rev_timestamp DESC' )
2541                         );
2542                 if( $s === false ) {
2543                         # No one else ever edited this page
2544                         return array(array('cantrollback'));
2545                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2546                         # Only admins can see this text
2547                         return array(array('notvisiblerev'));
2548                 }
2549
2550                 $set = array();
2551                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2552                         # Mark all reverted edits as bot
2553                         $set['rc_bot'] = 1;
2554                 }
2555                 if ( $wgUseRCPatrol ) {
2556                         # Mark all reverted edits as patrolled
2557                         $set['rc_patrolled'] = 1;
2558                 }
2559
2560                 if ( $set ) {
2561                         $dbw->update( 'recentchanges', $set,
2562                                         array( /* WHERE */
2563                                                 'rc_cur_id' => $current->getPage(),
2564                                                 'rc_user_text' => $current->getUserText(),
2565                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2566                                         ), __METHOD__
2567                                 );
2568                 }
2569
2570                 # Generate the edit summary if necessary
2571                 $target = Revision::newFromId( $s->rev_id );
2572                 if( empty( $summary ) ){
2573                         $summary = wfMsgForContent( 'revertpage' );
2574                 }
2575
2576                 # Allow the custom summary to use the same args as the default message
2577                 $args = array(
2578                         $target->getUserText(), $from, $s->rev_id,
2579                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2580                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2581                 );
2582                 $summary = wfMsgReplaceArgs( $summary, $args );
2583
2584                 # Save
2585                 $flags = EDIT_UPDATE;
2586
2587                 if( $wgUser->isAllowed('minoredit') )
2588                         $flags |= EDIT_MINOR;
2589
2590                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2591                         $flags |= EDIT_FORCE_BOT;
2592                 # Actually store the edit
2593                 $revId = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2594
2595                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2596
2597                 $resultDetails = array(
2598                         'summary' => $summary,
2599                         'current' => $current,
2600                         'target' => $target,
2601                         'newid' => $revId
2602                 );
2603                 return array();
2604         }
2605
2606         /**
2607          * User interface for rollback operations
2608          */
2609         function rollback() {
2610                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2611                 $details = null;
2612
2613                 $result = $this->doRollback(
2614                         $wgRequest->getVal( 'from' ),
2615                         $wgRequest->getText( 'summary' ),
2616                         $wgRequest->getVal( 'token' ),
2617                         $wgRequest->getBool( 'bot' ),
2618                         $details
2619                 );
2620
2621                 if( in_array( array( 'blocked' ), $result ) ) {
2622                         $wgOut->blockedPage();
2623                         return;
2624                 }
2625                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2626                         $wgOut->rateLimited();
2627                         return;
2628                 }
2629                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2630                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2631                         $errArray = $result[0];
2632                         $errMsg = array_shift( $errArray );
2633                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2634                         if( isset( $details['current'] ) ){
2635                                 $current = $details['current'];
2636                                 if( $current->getComment() != '' ) {
2637                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2638                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2639                                 }
2640                         }
2641                         return;
2642                 }
2643                 # Display permissions errors before read-only message -- there's no
2644                 # point in misleading the user into thinking the inability to rollback
2645                 # is only temporary.
2646                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2647                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2648                         # move any 'readonlytext' error manually.
2649                         $out = array();
2650                         foreach( $result as $error ) {
2651                                 if( $error != array( 'readonlytext' ) ) {
2652                                         $out []= $error;
2653                                 }
2654                         }
2655                         $wgOut->showPermissionsErrorPage( $out );
2656                         return;
2657                 }
2658                 if( $result == array( array('readonlytext') ) ) {
2659                         $wgOut->readOnlyPage();
2660                         return;
2661                 }
2662
2663                 $current = $details['current'];
2664                 $target = $details['target'];
2665                 $newId = $details['newid'];
2666                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2667                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2668                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2669                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2670                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2671                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2672                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2673                 $wgOut->returnToMain( false, $this->mTitle );
2674
2675                 if( !$wgRequest->getBool( 'hidediff', false ) ) {
2676                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2677                         $de->showDiff( '', '' );
2678                 }
2679         }
2680
2681
2682         /**
2683          * Do standard deferred updates after page view
2684          * @private
2685          */
2686         function viewUpdates() {
2687                 global $wgDeferredUpdateList, $wgUser;
2688
2689                 if ( 0 != $this->getID() ) {
2690                         # Don't update page view counters on views from bot users (bug 14044)
2691                         global $wgDisableCounters;
2692                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2693                                 Article::incViewCount( $this->getID() );
2694                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2695                                 array_push( $wgDeferredUpdateList, $u );
2696                         }
2697                 }
2698
2699                 # Update newtalk / watchlist notification status
2700                 $wgUser->clearNotification( $this->mTitle );
2701         }
2702
2703         /**
2704          * Prepare text which is about to be saved.
2705          * Returns a stdclass with source, pst and output members
2706          */
2707         function prepareTextForEdit( $text, $revid=null ) {
2708                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2709                         // Already prepared
2710                         return $this->mPreparedEdit;
2711                 }
2712                 global $wgParser;
2713                 $edit = (object)array();
2714                 $edit->revid = $revid;
2715                 $edit->newText = $text;
2716                 $edit->pst = $this->preSaveTransform( $text );
2717                 $options = new ParserOptions;
2718                 $options->setTidy( true );
2719                 $options->enableLimitReport();
2720                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2721                 $edit->oldText = $this->getContent();
2722                 $this->mPreparedEdit = $edit;
2723                 return $edit;
2724         }
2725
2726         /**
2727          * Do standard deferred updates after page edit.
2728          * Update links tables, site stats, search index and message cache.
2729          * Purges pages that include this page if the text was changed here.
2730          * Every 100th edit, prune the recent changes table.
2731          *
2732          * @private
2733          * @param $text New text of the article
2734          * @param $summary Edit summary
2735          * @param $minoredit Minor edit
2736          * @param $timestamp_of_pagechange Timestamp associated with the page change
2737          * @param $newid rev_id value of the new revision
2738          * @param $changed Whether or not the content actually changed
2739          */
2740         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2741                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2742
2743                 wfProfileIn( __METHOD__ );
2744
2745                 # Parse the text
2746                 # Be careful not to double-PST: $text is usually already PST-ed once
2747                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2748                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2749                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2750                 } else {
2751                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2752                         $editInfo = $this->mPreparedEdit;
2753                 }
2754
2755                 # Save it to the parser cache
2756                 if ( $wgEnableParserCache ) {
2757                         $parserCache = ParserCache::singleton();
2758                         $parserCache->save( $editInfo->output, $this, $wgUser );
2759                 }
2760
2761                 # Update the links tables
2762                 $u = new LinksUpdate( $this->mTitle, $editInfo->output, false );
2763                 $u->setRecursiveTouch( $changed ); // refresh/invalidate including pages too
2764                 $u->doUpdate();
2765
2766                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2767                         if ( 0 == mt_rand( 0, 99 ) ) {
2768                                 // Flush old entries from the `recentchanges` table; we do this on
2769                                 // random requests so as to avoid an increase in writes for no good reason
2770                                 global $wgRCMaxAge;
2771                                 $dbw = wfGetDB( DB_MASTER );
2772                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2773                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2774                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2775                                 $dbw->query( $sql );
2776                         }
2777                 }
2778
2779                 $id = $this->getID();
2780                 $title = $this->mTitle->getPrefixedDBkey();
2781                 $shortTitle = $this->mTitle->getDBkey();
2782
2783                 if ( 0 == $id ) {
2784                         wfProfileOut( __METHOD__ );
2785                         return;
2786                 }
2787
2788                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2789                 array_push( $wgDeferredUpdateList, $u );
2790                 $u = new SearchUpdate( $id, $title, $text );
2791                 array_push( $wgDeferredUpdateList, $u );
2792
2793                 # If this is another user's talk page, update newtalk
2794                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2795                 # load of user talk pages and piss people off, nor if it's a minor edit
2796                 # by a properly-flagged bot.
2797                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2798                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2799                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2800                                 $other = User::newFromName( $shortTitle, false );
2801                                 if ( !$other ) {
2802                                         wfDebug( __METHOD__.": invalid username\n" );
2803                                 } elseif( User::isIP( $shortTitle ) ) {
2804                                         // An anonymous user
2805                                         $other->setNewtalk( true );
2806                                 } elseif( $other->isLoggedIn() ) {
2807                                         $other->setNewtalk( true );
2808                                 } else {
2809                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2810                                 }
2811                         }
2812                 }
2813
2814                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2815                         $wgMessageCache->replace( $shortTitle, $text );
2816                 }
2817
2818                 wfProfileOut( __METHOD__ );
2819         }
2820
2821         /**
2822          * Perform article updates on a special page creation.
2823          *
2824          * @param Revision $rev
2825          *
2826          * @todo This is a shitty interface function. Kill it and replace the
2827          * other shitty functions like editUpdates and such so it's not needed
2828          * anymore.
2829          */
2830         function createUpdates( $rev ) {
2831                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2832                 $this->mTotalAdjustment = 1;
2833                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2834                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2835         }
2836
2837         /**
2838          * Generate the navigation links when browsing through an article revisions
2839          * It shows the information as:
2840          *   Revision as of \<date\>; view current revision
2841          *   \<- Previous version | Next Version -\>
2842          *
2843          * @private
2844          * @param string $oldid         Revision ID of this article revision
2845          */
2846         function setOldSubtitle( $oldid=0 ) {
2847                 global $wgLang, $wgOut, $wgUser;
2848
2849                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2850                                 return;
2851                 }
2852
2853                 $revision = Revision::newFromId( $oldid );
2854
2855                 $current = ( $oldid == $this->mLatest );
2856                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2857                 $sk = $wgUser->getSkin();
2858                 $lnk = $current
2859                         ? wfMsg( 'currentrevisionlink' )
2860                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2861                 $curdiff = $current
2862                         ? wfMsg( 'diff' )
2863                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2864                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2865                 $prevlink = $prev
2866                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2867                         : wfMsg( 'previousrevision' );
2868                 $prevdiff = $prev
2869                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2870                         : wfMsg( 'diff' );
2871                 $nextlink = $current
2872                         ? wfMsg( 'nextrevision' )
2873                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2874                 $nextdiff = $current
2875                         ? wfMsg( 'diff' )
2876                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2877
2878                 $cdel='';
2879                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2880                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2881                         if( $revision->isCurrent() ) {
2882                         // We don't handle top deleted edits too well
2883                                 $cdel = wfMsgHtml('rev-delundel');
2884                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2885                         // If revision was hidden from sysops
2886                                 $cdel = wfMsgHtml('rev-delundel');
2887                         } else {
2888                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2889                                         wfMsgHtml('rev-delundel'),
2890                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2891                                         '&oldid=' . urlencode( $oldid ) );
2892                                 // Bolden oversighted content
2893                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2894                                         $cdel = "<strong>$cdel</strong>";
2895                         }
2896                         $cdel = "(<small>$cdel</small>) ";
2897                 }
2898                 # Show user links if allowed to see them. Normally they
2899                 # are hidden regardless, but since we can already see the text here...
2900                 $userlinks = $sk->revUserTools( $revision, false );
2901
2902                 $m = wfMsg( 'revision-info-current' );
2903                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2904                         ? 'revision-info-current'
2905                         : 'revision-info';
2906
2907                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2908
2909                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsg( 'revision-nav', $prevdiff,
2910                                 $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2911                 $wgOut->setSubtitle( $r );
2912         }
2913
2914         /**
2915          * This function is called right before saving the wikitext,
2916          * so we can do things like signatures and links-in-context.
2917          *
2918          * @param string $text
2919          */
2920         function preSaveTransform( $text ) {
2921                 global $wgParser, $wgUser;
2922                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2923         }
2924
2925         /* Caching functions */
2926
2927         /**
2928          * checkLastModified returns true if it has taken care of all
2929          * output to the client that is necessary for this request.
2930          * (that is, it has sent a cached version of the page)
2931          */
2932         function tryFileCache() {
2933                 static $called = false;
2934                 if( $called ) {
2935                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2936                         return;
2937                 }
2938                 $called = true;
2939                 if($this->isFileCacheable()) {
2940                         $touched = $this->mTouched;
2941                         $cache = new HTMLFileCache( $this->mTitle );
2942                         if($cache->isFileCacheGood( $touched )) {
2943                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2944                                 $cache->loadFromFileCache();
2945                                 return true;
2946                         } else {
2947                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2948                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2949                         }
2950                 } else {
2951                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2952                 }
2953         }
2954
2955         /**
2956          * Check if the page can be cached
2957          * @return bool
2958          */
2959         function isFileCacheable() {
2960                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2961                 $action    = $wgRequest->getVal( 'action'    );
2962                 $oldid     = $wgRequest->getVal( 'oldid'     );
2963                 $diff      = $wgRequest->getVal( 'diff'      );
2964                 $redirect  = $wgRequest->getVal( 'redirect'  );
2965                 $printable = $wgRequest->getVal( 'printable' );
2966                 $page      = $wgRequest->getVal( 'page' );
2967                 $useskin   = $wgRequest->getVal( 'useskin' );
2968
2969                 //check for non-standard user language; this covers uselang,
2970                 //and extensions for auto-detecting user language.
2971                 $ulang     = $wgLang->getCode();
2972                 $clang     = $wgContLang->getCode();
2973
2974                 $cacheable = $wgUseFileCache
2975                         && (!$wgShowIPinHeader)
2976                         && ($this->getID() != 0)
2977                         && ($wgUser->isAnon())
2978                         && (!$wgUser->getNewtalk())
2979                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2980                         && (!isset($useskin))
2981                         && (empty( $action ) || $action == 'view')
2982                         && (!isset($oldid))
2983                         && (!isset($diff))
2984                         && (!isset($redirect))
2985                         && (!isset($printable))
2986                         && !isset($page)
2987                         && (!$this->mRedirectedFrom)
2988                         && ($ulang === $clang);
2989
2990                 if ( $cacheable ) {
2991                         //extension may have reason to disable file caching on some pages.
2992                         $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
2993                 }
2994
2995                 return $cacheable;
2996         }
2997
2998         /**
2999          * Loads page_touched and returns a value indicating if it should be used
3000          *
3001          */
3002         function checkTouched() {
3003                 if( !$this->mDataLoaded ) {
3004                         $this->loadPageData();
3005                 }
3006                 return !$this->mIsRedirect;
3007         }
3008
3009         /**
3010          * Get the page_touched field
3011          */
3012         function getTouched() {
3013                 # Ensure that page data has been loaded
3014                 if( !$this->mDataLoaded ) {
3015                         $this->loadPageData();
3016                 }
3017                 return $this->mTouched;
3018         }
3019
3020         /**
3021          * Get the page_latest field
3022          */
3023         function getLatest() {
3024                 if ( !$this->mDataLoaded ) {
3025                         $this->loadPageData();
3026                 }
3027                 return $this->mLatest;
3028         }
3029
3030         /**
3031          * Edit an article without doing all that other stuff
3032          * The article must already exist; link tables etc
3033          * are not updated, caches are not flushed.
3034          *
3035          * @param string $text text submitted
3036          * @param string $comment comment submitted
3037          * @param bool $minor whereas it's a minor modification
3038          */
3039         function quickEdit( $text, $comment = '', $minor = 0 ) {
3040                 wfProfileIn( __METHOD__ );
3041
3042                 $dbw = wfGetDB( DB_MASTER );
3043                 $revision = new Revision( array(
3044                         'page'       => $this->getId(),
3045                         'text'       => $text,
3046                         'comment'    => $comment,
3047                         'minor_edit' => $minor ? 1 : 0,
3048                         ) );
3049                 $revision->insertOn( $dbw );
3050                 $this->updateRevisionOn( $dbw, $revision );
3051
3052                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
3053
3054                 wfProfileOut( __METHOD__ );
3055         }
3056
3057         /**
3058          * Used to increment the view counter
3059          *
3060          * @static
3061          * @param integer $id article id
3062          */
3063         function incViewCount( $id ) {
3064                 $id = intval( $id );
3065                 global $wgHitcounterUpdateFreq, $wgDBtype;
3066
3067                 $dbw = wfGetDB( DB_MASTER );
3068                 $pageTable = $dbw->tableName( 'page' );
3069                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3070                 $acchitsTable = $dbw->tableName( 'acchits' );
3071
3072                 if( $wgHitcounterUpdateFreq <= 1 ) {
3073                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3074                         return;
3075                 }
3076
3077                 # Not important enough to warrant an error page in case of failure
3078                 $oldignore = $dbw->ignoreErrors( true );
3079
3080                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3081
3082                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3083                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3084                         # Most of the time (or on SQL errors), skip row count check
3085                         $dbw->ignoreErrors( $oldignore );
3086                         return;
3087                 }
3088
3089                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3090                 $row = $dbw->fetchObject( $res );
3091                 $rown = intval( $row->n );
3092                 if( $rown >= $wgHitcounterUpdateFreq ){
3093                         wfProfileIn( 'Article::incViewCount-collect' );
3094                         $old_user_abort = ignore_user_abort( true );
3095
3096                         if ($wgDBtype == 'mysql')
3097                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3098                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3099                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3100                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3101                                 'GROUP BY hc_id');
3102                         $dbw->query("DELETE FROM $hitcounterTable");
3103                         if ($wgDBtype == 'mysql') {
3104                                 $dbw->query('UNLOCK TABLES');
3105                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3106                                         'WHERE page_id = hc_id');
3107                         }
3108                         else {
3109                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3110                                         "FROM $acchitsTable WHERE page_id = hc_id");
3111                         }
3112                         $dbw->query("DROP TABLE $acchitsTable");
3113
3114                         ignore_user_abort( $old_user_abort );
3115                         wfProfileOut( 'Article::incViewCount-collect' );
3116                 }
3117                 $dbw->ignoreErrors( $oldignore );
3118         }
3119
3120         /**#@+
3121          * The onArticle*() functions are supposed to be a kind of hooks
3122          * which should be called whenever any of the specified actions
3123          * are done.
3124          *
3125          * This is a good place to put code to clear caches, for instance.
3126          *
3127          * This is called on page move and undelete, as well as edit
3128          * @static
3129          * @param $title_obj a title object
3130          */
3131
3132         public static function onArticleCreate( $title ) {
3133                 # Update existence markers on article/talk tabs...
3134                 if ( $title->isTalkPage() ) {
3135                         $other = $title->getSubjectPage();
3136                 } else {
3137                         $other = $title->getTalkPage();
3138                 }
3139                 $other->invalidateCache();
3140                 $other->purgeSquid();
3141
3142                 $title->touchLinks();
3143                 $title->purgeSquid();
3144                 $title->deleteTitleProtection();
3145         }
3146
3147         public static function onArticleDelete( $title ) {
3148                 global $wgUseFileCache, $wgMessageCache;
3149                 # Update existence markers on article/talk tabs...
3150                 if( $title->isTalkPage() ) {
3151                         $other = $title->getSubjectPage();
3152                 } else {
3153                         $other = $title->getTalkPage();
3154                 }
3155                 $other->invalidateCache();
3156                 $other->purgeSquid();
3157
3158                 $title->touchLinks();
3159                 $title->purgeSquid();
3160
3161                 # File cache
3162                 if ( $wgUseFileCache ) {
3163                         $cm = new HTMLFileCache( $title );
3164                         @unlink( $cm->fileCacheName() );
3165                 }
3166
3167                 # Messages
3168                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3169                         $wgMessageCache->replace( $title->getDBkey(), false );
3170                 }
3171                 # Images
3172                 if( $title->getNamespace() == NS_IMAGE ) {
3173                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3174                         $update->doUpdate();
3175                 }
3176                 # User talk pages
3177                 if( $title->getNamespace() == NS_USER_TALK ) {
3178                         $user = User::newFromName( $title->getText(), false );
3179                         $user->setNewtalk( false );
3180                 }
3181         }
3182
3183         /**
3184          * Purge caches on page update etc
3185          */
3186         public static function onArticleEdit( $title, $touchTemplates = true ) {
3187                 global $wgDeferredUpdateList, $wgUseFileCache;
3188
3189                 // Invalidate caches of articles which include this page
3190                 if( $touchTemplates )
3191                         $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3192
3193                 // Invalidate the caches of all pages which redirect here
3194                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3195
3196                 # Purge squid for this page only
3197                 $title->purgeSquid();
3198
3199                 # Clear file cache for this page only
3200                 if ( $wgUseFileCache ) {
3201                         $cm = new HTMLFileCache( $title );
3202                         @unlink( $cm->fileCacheName() );
3203                 }
3204         }
3205
3206         /**#@-*/
3207
3208         /**
3209          * Overriden by ImagePage class, only present here to avoid a fatal error
3210          * Called for ?action=revert
3211          */
3212         public function revert(){
3213                 global $wgOut;
3214                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3215         }
3216
3217         /**
3218          * Info about this page
3219          * Called for ?action=info when $wgAllowPageInfo is on.
3220          *
3221          * @public
3222          */
3223         function info() {
3224                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3225
3226                 if ( !$wgAllowPageInfo ) {
3227                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3228                         return;
3229                 }
3230
3231                 $page = $this->mTitle->getSubjectPage();
3232
3233                 $wgOut->setPagetitle( $page->getPrefixedText() );
3234                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3235                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3236
3237                 if( !$this->mTitle->exists() ) {
3238                         $wgOut->addHtml( '<div class="noarticletext">' );
3239                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3240                                 // This doesn't quite make sense; the user is asking for
3241                                 // information about the _page_, not the message... -- RC
3242                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3243                         } else {
3244                                 $msg = $wgUser->isLoggedIn()
3245                                         ? 'noarticletext'
3246                                         : 'noarticletextanon';
3247                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3248                         }
3249                         $wgOut->addHtml( '</div>' );
3250                 } else {
3251                         $dbr = wfGetDB( DB_SLAVE );
3252                         $wl_clause = array(
3253                                 'wl_title'     => $page->getDBkey(),
3254                                 'wl_namespace' => $page->getNamespace() );
3255                         $numwatchers = $dbr->selectField(
3256                                 'watchlist',
3257                                 'COUNT(*)',
3258                                 $wl_clause,
3259                                 __METHOD__,
3260                                 $this->getSelectOptions() );
3261
3262                         $pageInfo = $this->pageCountInfo( $page );
3263                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3264
3265                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3266                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3267                         if( $talkInfo ) {
3268                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3269                         }
3270                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3271                         if( $talkInfo ) {
3272                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3273                         }
3274                         $wgOut->addHTML( '</ul>' );
3275
3276                 }
3277         }
3278
3279         /**
3280          * Return the total number of edits and number of unique editors
3281          * on a given page. If page does not exist, returns false.
3282          *
3283          * @param Title $title
3284          * @return array
3285          * @private
3286          */
3287         function pageCountInfo( $title ) {
3288                 $id = $title->getArticleId();
3289                 if( $id == 0 ) {
3290                         return false;
3291                 }
3292
3293                 $dbr = wfGetDB( DB_SLAVE );
3294
3295                 $rev_clause = array( 'rev_page' => $id );
3296
3297                 $edits = $dbr->selectField(
3298                         'revision',
3299                         'COUNT(rev_page)',
3300                         $rev_clause,
3301                         __METHOD__,
3302                         $this->getSelectOptions() );
3303
3304                 $authors = $dbr->selectField(
3305                         'revision',
3306                         'COUNT(DISTINCT rev_user_text)',
3307                         $rev_clause,
3308                         __METHOD__,
3309                         $this->getSelectOptions() );
3310
3311                 return array( 'edits' => $edits, 'authors' => $authors );
3312         }
3313
3314         /**
3315          * Return a list of templates used by this article.
3316          * Uses the templatelinks table
3317          *
3318          * @return array Array of Title objects
3319          */
3320         public function getUsedTemplates() {
3321                 $result = array();
3322                 $id = $this->mTitle->getArticleID();
3323                 if( $id == 0 ) {
3324                         return array();
3325                 }
3326
3327                 $dbr = wfGetDB( DB_SLAVE );
3328                 $res = $dbr->select( array( 'templatelinks' ),
3329                         array( 'tl_namespace', 'tl_title' ),
3330                         array( 'tl_from' => $id ),
3331                         __METHOD__ );
3332                 if( false !== $res ) {
3333                         foreach( $res as $row ) {
3334                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3335                         }
3336                 }
3337                 $dbr->freeResult( $res );
3338                 return $result;
3339         }
3340
3341         /**
3342          * Returns a list of hidden categories this page is a member of.
3343          * Uses the page_props and categorylinks tables.
3344          *
3345          * @return array Array of Title objects
3346          */
3347         public function getHiddenCategories() {
3348                 $result = array();
3349                 $id = $this->mTitle->getArticleID();
3350                 if( $id == 0 ) {
3351                         return array();
3352                 }
3353
3354                 $dbr = wfGetDB( DB_SLAVE );
3355                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3356                         array( 'cl_to' ),
3357                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3358                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3359                         __METHOD__ );
3360                 if ( false !== $res ) {
3361                         foreach( $res as $row ) {
3362                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3363                         }
3364                 }
3365                 $dbr->freeResult( $res );
3366                 return $result;
3367         }
3368
3369         /**
3370         * Return an applicable autosummary if one exists for the given edit.
3371         * @param string $oldtext The previous text of the page.
3372         * @param string $newtext The submitted text of the page.
3373         * @param bitmask $flags A bitmask of flags submitted for the edit.
3374         * @return string An appropriate autosummary, or an empty string.
3375         */
3376         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3377                 # Decide what kind of autosummary is needed.
3378
3379                 # Redirect autosummaries
3380                 $rt = Title::newFromRedirect( $newtext );
3381                 if( is_object( $rt ) ) {
3382                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3383                 }
3384
3385                 # New page autosummaries
3386                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3387                         # If they're making a new article, give its text, truncated, in the summary.
3388                         global $wgContLang;
3389                         $truncatedtext = $wgContLang->truncate(
3390                                 str_replace("\n", ' ', $newtext),
3391                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3392                                 '...' );
3393                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3394                 }
3395
3396                 # Blanking autosummaries
3397                 if( $oldtext != '' && $newtext == '' ) {
3398                         return wfMsgForContent('autosumm-blank');
3399                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3400                         # Removing more than 90% of the article
3401                         global $wgContLang;
3402                         $truncatedtext = $wgContLang->truncate(
3403                                 $newtext,
3404                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3405                                 '...'
3406                         );
3407                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3408                 }
3409
3410                 # If we reach this point, there's no applicable autosummary for our case, so our
3411                 # autosummary is empty.
3412                 return '';
3413         }
3414
3415         /**
3416          * Add the primary page-view wikitext to the output buffer
3417          * Saves the text into the parser cache if possible.
3418          * Updates templatelinks if it is out of date.
3419          *
3420          * @param string  $text
3421          * @param bool    $cache
3422          */
3423         public function outputWikiText( $text, $cache = true ) {
3424                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache;
3425
3426                 $popts = $wgOut->parserOptions();
3427                 $popts->setTidy(true);
3428                 $popts->enableLimitReport();
3429                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3430                         $popts, true, true, $this->getRevIdFetched() );
3431                 $popts->setTidy(false);
3432                 $popts->enableLimitReport( false );
3433                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3434                         $parserCache = ParserCache::singleton();
3435                         $parserCache->save( $parserOutput, $this, $wgUser );
3436                 }
3437
3438                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3439                         // templatelinks table may have become out of sync,
3440                         // especially if using variable-based transclusions.
3441                         // For paranoia, check if things have changed and if
3442                         // so apply updates to the database. This will ensure
3443                         // that cascaded protections apply as soon as the changes
3444                         // are visible.
3445
3446                         # Get templates from templatelinks
3447                         $id = $this->mTitle->getArticleID();
3448
3449                         $tlTemplates = array();
3450
3451                         $dbr = wfGetDB( DB_SLAVE );
3452                         $res = $dbr->select( array( 'templatelinks' ),
3453                                 array( 'tl_namespace', 'tl_title' ),
3454                                 array( 'tl_from' => $id ),
3455                                 __METHOD__ );
3456
3457                         global $wgContLang;
3458
3459                         if ( false !== $res ) {
3460                                 foreach( $res as $row ) {
3461                                         $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3462                                 }
3463                         }
3464
3465                         # Get templates from parser output.
3466                         $poTemplates_allns = $parserOutput->getTemplates();
3467
3468                         $poTemplates = array ();
3469                         foreach ( $poTemplates_allns as $ns_templates ) {
3470                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3471                         }
3472
3473                         # Get the diff
3474                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3475
3476                         if ( count( $templates_diff ) > 0 ) {
3477                                 # Whee, link updates time.
3478                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3479                                 $u->doUpdate();
3480                         }
3481                 }
3482
3483                 $wgOut->addParserOutput( $parserOutput );
3484         }
3485
3486         /**
3487          * Update all the appropriate counts in the category table, given that
3488          * we've added the categories $added and deleted the categories $deleted.
3489          *
3490          * @param $added array   The names of categories that were added
3491          * @param $deleted array The names of categories that were deleted
3492          * @return null
3493          */
3494         public function updateCategoryCounts( $added, $deleted ) {
3495                 $ns = $this->mTitle->getNamespace();
3496                 $dbw = wfGetDB( DB_MASTER );
3497
3498                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3499                 # exist, we might legitimately not create it, but it's simpler to just
3500                 # create it and then give it a negative value, since the value is bogus
3501                 # anyway.
3502                 #
3503                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3504                 $insertCats = array_merge( $added, $deleted );
3505                 if( !$insertCats ) {
3506                         # Okay, nothing to do
3507                         return;
3508                 }
3509                 $insertRows = array();
3510                 foreach( $insertCats as $cat ) {
3511                         $insertRows[] = array( 'cat_title' => $cat );
3512                 }
3513                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3514
3515                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3516                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3517                 if( $ns == NS_CATEGORY ) {
3518                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3519                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3520                 } elseif( $ns == NS_IMAGE ) {
3521                         $addFields[]    = 'cat_files = cat_files + 1';
3522                         $removeFields[] = 'cat_files = cat_files - 1';
3523                 }
3524
3525                 if ( $added ) {
3526                         $dbw->update(
3527                                 'category',
3528                                 $addFields,
3529                                 array( 'cat_title' => $added ),
3530                                 __METHOD__
3531                         );
3532                 }
3533                 if ( $deleted ) {
3534                         $dbw->update(
3535                                 'category',
3536                                 $removeFields,
3537                                 array( 'cat_title' => $deleted ),
3538                                 __METHOD__
3539                         );
3540                 }
3541         }
3542 }