includes/Article.php

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