includes/Article.php

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