includes/Article.php

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