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