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