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 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          * @param $limit Integer: default 0.
 639          * @param $offset Integer: default 0.
 640          */
 641         function getContributors($limit = 0, $offset = 0) {
 642                 # XXX: this is expensive; cache this info somewhere.
 643
 644                 $contribs = array();
 645                 $dbr = wfGetDB( DB_SLAVE );
 646                 $revTable = $dbr->tableName( 'revision' );
 647                 $userTable = $dbr->tableName( 'user' );
 648                 $user = $this->getUser();
 649                 $pageId = $this->getId();
 650
 651                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 652                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 653                         WHERE rev_page = $pageId
 654                         AND rev_user != $user
 655                         GROUP BY rev_user, rev_user_text, user_real_name
 656                         ORDER BY timestamp DESC";
 657
 658                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 659                 if ($offset > 0) { $sql .= ' OFFSET '.$offset; }
 660
 661                 $sql .= ' '. $this->getSelectOptions();
 662
 663                 $res = $dbr->query($sql, __METHOD__);
 664
 665                 while ( $line = $dbr->fetchObject( $res ) ) {
 666                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 667                 }
 668
 669                 $dbr->freeResult($res);
 670                 return $contribs;
 671         }
 672
 673         /**
 674          * This is the default action of the script: just view the page of
 675          * the given title.
 676         */
 677         function view() {
 678                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 679                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 680                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 681                 global $wgDefaultRobotPolicy;
 682                 $sk = $wgUser->getSkin();
 683
 684                 wfProfileIn( __METHOD__ );
 685
 686                 $parserCache = ParserCache::singleton();
 687                 $ns = $this->mTitle->getNamespace(); # shortcut
 688
 689                 # Get variables from query string
 690                 $oldid = $this->getOldID();
 691
 692                 # getOldID may want us to redirect somewhere else
 693                 if ( $this->mRedirectUrl ) {
 694                         $wgOut->redirect( $this->mRedirectUrl );
 695                         wfProfileOut( __METHOD__ );
 696                         return;
 697                 }
 698
 699                 $diff = $wgRequest->getVal( 'diff' );
 700                 $rcid = $wgRequest->getVal( 'rcid' );
 701                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 702                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 703                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 704
 705                 $wgOut->setArticleFlag( true );
 706
 707                 # Discourage indexing of printable versions, but encourage following
 708                 if( $wgOut->isPrintable() ) {
 709                         $policy = 'noindex,follow';
 710                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 711                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 712                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 713                         # Honour customised robot policies for this namespace
 714                         $policy = $wgNamespaceRobotPolicies[$ns];
 715                 } else {
 716                         $policy = $wgDefaultRobotPolicy;
 717                 }
 718                 $wgOut->setRobotPolicy( $policy );
 719
 720                 # If we got diff and oldid in the query, we want to see a
 721                 # diff page instead of the article.
 722
 723                 if ( !is_null( $diff ) ) {
 724                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 725
 726                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge );
 727                         // DifferenceEngine directly fetched the revision:
 728                         $this->mRevIdFetched = $de->mNewid;
 729                         $de->showDiffPage( $diffOnly );
 730
 731                         // Needed to get the page's current revision
 732                         $this->loadPageData();
 733                         if( $diff == 0 || $diff == $this->mLatest ) {
 734                                 # Run view updates for current revision only
 735                                 $this->viewUpdates();
 736                         }
 737                         wfProfileOut( __METHOD__ );
 738                         return;
 739                 }
 740
 741                 if ( empty( $oldid ) && $this->checkTouched() ) {
 742                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 743
 744                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 745                                 wfProfileOut( __METHOD__ );
 746                                 return;
 747                         } else if ( $this->tryFileCache() ) {
 748                                 # tell wgOut that output is taken care of
 749                                 $wgOut->disable();
 750                                 $this->viewUpdates();
 751                                 wfProfileOut( __METHOD__ );
 752                                 return;
 753                         }
 754                 }
 755
 756                 # Should the parser cache be used?
 757                 $pcache = $this->useParserCache( $oldid );
 758                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 759                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 760                         wfIncrStats( 'pcache_miss_stub' );
 761                 }
 762
 763                 $wasRedirected = false;
 764                 if ( isset( $this->mRedirectedFrom ) ) {
 765                         // This is an internally redirected page view.
 766                         // We'll need a backlink to the source page for navigation.
 767                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 768                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 769                                 $s = wfMsg( 'redirectedfrom', $redir );
 770                                 $wgOut->setSubtitle( $s );
 771
 772                                 // Set the fragment if one was specified in the redirect
 773                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 774                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 775                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 776                                 }
 777                                 $wasRedirected = true;
 778                         }
 779                 } elseif ( !empty( $rdfrom ) ) {
 780                         // This is an externally redirected view, from some other wiki.
 781                         // If it was reported from a trusted site, supply a backlink.
 782                         global $wgRedirectSources;
 783                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 784                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 785                                 $s = wfMsg( 'redirectedfrom', $redir );
 786                                 $wgOut->setSubtitle( $s );
 787                                 $wasRedirected = true;
 788                         }
 789                 }
 790
 791                 $outputDone = false;
 792                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 793                 if ( $pcache ) {
 794                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 795                                 // Ensure that UI elements requiring revision ID have
 796                                 // the correct version information.
 797                                 $wgOut->setRevisionId( $this->mLatest );
 798                                 $outputDone = true;
 799                         }
 800                 }
 801                 # Fetch content and check for errors
 802                 if ( !$outputDone ) {
 803                         $text = $this->getContent();
 804                         if ( $text === false ) {
 805                                 # Failed to load, replace text with error message
 806                                 $t = $this->mTitle->getPrefixedText();
 807                                 if( $oldid ) {
 808                                         $d = wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid );
 809                                         $text = wfMsg( 'missing-article', $t, $d );
 810                                 } else {
 811                                         $text = wfMsg( 'noarticletext' );
 812                                 }
 813                         }
 814
 815                         # Another whitelist check in case oldid is altering the title
 816                         if ( !$this->mTitle->userCanRead() ) {
 817                                 $wgOut->loginToUse();
 818                                 $wgOut->output();
 819                                 wfProfileOut( __METHOD__ );
 820                                 exit;
 821                         }
 822
 823                         # We're looking at an old revision
 824                         if ( !empty( $oldid ) ) {
 825                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 826                                 if( is_null( $this->mRevision ) ) {
 827                                         // FIXME: This would be a nice place to load the 'no such page' text.
 828                                 } else {
 829                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 830                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 831                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 832                                                         $wgOut->addWikiMsg( 'rev-deleted-text-permission' );
 833                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 834                                                         wfProfileOut( __METHOD__ );
 835                                                         return;
 836                                                 } else {
 837                                                         $wgOut->addWikiMsg( 'rev-deleted-text-view' );
 838                                                         // and we are allowed to see...
 839                                                 }
 840                                         }
 841                                 }
 842                         }
 843
 844                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 845
 846                          // Pages containing custom CSS or JavaScript get special treatment
 847                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 848                                 $wgOut->addHtml( wfMsgExt( 'clearyourcache', 'parse' ) );
 849                                 // Give hooks a chance to customise the output
 850                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 851                                         // Wrap the whole lot in a <pre> and don't parse
 852                                         $m = array();
 853                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 854                                         $wgOut->addHtml( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 855                                         $wgOut->addHtml( htmlspecialchars( $this->mContent ) );
 856                                         $wgOut->addHtml( "\n</pre>\n" );
 857                                 }
 858                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 859                                 # Don't append the subtitle if this was an old revision
 860                                 $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() );
 861                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 862                                 $wgOut->addParserOutputNoText( $parseout );
 863                         } else if ( $pcache ) {
 864                                 # Display content and save to parser cache
 865                                 $this->outputWikiText( $text );
 866                         } else {
 867                                 # Display content, don't attempt to save to parser cache
 868                                 # Don't show section-edit links on old revisions... this way lies madness.
 869                                 if( !$this->isCurrent() ) {
 870                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 871                                 }
 872                                 # Display content and don't save to parser cache
 873                                 # With timing hack -- TS 2006-07-26
 874                                 $time = -wfTime();
 875                                 $this->outputWikiText( $text, false );
 876                                 $time += wfTime();
 877
 878                                 # Timing hack
 879                                 if ( $time > 3 ) {
 880                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 881                                                 $this->mTitle->getPrefixedDBkey()));
 882                                 }
 883
 884                                 if( !$this->isCurrent() ) {
 885                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 886                                 }
 887                         }
 888                 }
 889                 /* title may have been set from the cache */
 890                 $t = $wgOut->getPageTitle();
 891                 if( empty( $t ) ) {
 892                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 893                 }
 894
 895                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 896                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 897                         $wgOut->addWikiMsg('anontalkpagetext');
 898                 }
 899
 900                 # If we have been passed an &rcid= parameter, we want to give the user a
 901                 # chance to mark this new article as patrolled.
 902                 if( !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) && $this->mTitle->exists() ) {
 903                         $wgOut->addHTML(
 904                                 "<div class='patrollink'>" .
 905                                         wfMsgHtml( 'markaspatrolledlink',
 906                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 907                                                 "action=markpatrolled&rcid=$rcid" )
 908                                         ) .
 909                                 '</div>'
 910                          );
 911                 }
 912
 913                 # Trackbacks
 914                 if ($wgUseTrackbacks)
 915                         $this->addTrackbacks();
 916
 917                 $this->viewUpdates();
 918                 wfProfileOut( __METHOD__ );
 919         }
 920
 921         /*
 922         * Should the parser cache be used?
 923         */
 924         protected function useParserCache( $oldid ) {
 925                 global $wgUser, $wgEnableParserCache;
 926
 927                 return $wgEnableParserCache
 928                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
 929                         && $this->exists()
 930                         && empty( $oldid )
 931                         && !$this->mTitle->isCssOrJsPage()
 932                         && !$this->mTitle->isCssJsSubpage();
 933         }
 934
 935         protected function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
 936                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
 937
 938                 # Display redirect
 939                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 940                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 941
 942                 if( $appendSubtitle ) {
 943                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 944                 }
 945                 $sk = $wgUser->getSkin();
 946                 if ( $forceKnown )
 947                         $link = $sk->makeKnownLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 948                 else
 949                         $link = $sk->makeLinkObj( $target, htmlspecialchars( $target->getFullText() ) );
 950
 951                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 952                         '<span class="redirectText">'.$link.'</span>' );
 953
 954         }
 955
 956         function addTrackbacks() {
 957                 global $wgOut, $wgUser;
 958
 959                 $dbr = wfGetDB(DB_SLAVE);
 960                 $tbs = $dbr->select(
 961                                 /* FROM   */ 'trackbacks',
 962                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 963                                 /* WHERE  */ array('tb_page' => $this->getID())
 964                 );
 965
 966                 if (!$dbr->numrows($tbs))
 967                         return;
 968
 969                 $tbtext = "";
 970                 while ($o = $dbr->fetchObject($tbs)) {
 971                         $rmvtxt = "";
 972                         if ($wgUser->isAllowed( 'trackback' )) {
 973                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 974                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 975                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 976                         }
 977                         $tbtext .= "\n";
 978                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 979                                         $o->tb_title,
 980                                         $o->tb_url,
 981                                         $o->tb_ex,
 982                                         $o->tb_name,
 983                                         $rmvtxt);
 984                 }
 985                 $wgOut->addWikiMsg( 'trackbackbox', $tbtext );
 986         }
 987
 988         function deletetrackback() {
 989                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 990
 991                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 992                         $wgOut->addWikiMsg( 'sessionfailure' );
 993                         return;
 994                 }
 995
 996                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
 997
 998                 if (count($permission_errors)>0)
 999                 {
1000                         $wgOut->showPermissionsErrorPage( $permission_errors );
1001                         return;
1002                 }
1003
1004                 $db = wfGetDB(DB_MASTER);
1005                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
1006                 $wgTitle->invalidateCache();
1007                 $wgOut->addWikiMsg('trackbackdeleteok');
1008         }
1009
1010         function render() {
1011                 global $wgOut;
1012
1013                 $wgOut->setArticleBodyOnly(true);
1014                 $this->view();
1015         }
1016
1017         /**
1018          * Handle action=purge
1019          */
1020         function purge() {
1021                 global $wgUser, $wgRequest, $wgOut;
1022
1023                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1024                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1025                                 $this->doPurge();
1026                         }
1027                 } else {
1028                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
1029                         $action = htmlspecialchars( $_SERVER['REQUEST_URI'] );
1030                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
1031                         $msg = str_replace( '$1',
1032                                 "<form method=\"post\" action=\"$action\">\n" .
1033                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1034                                 "</form>\n", $msg );
1035
1036                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1037                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1038                         $wgOut->addHTML( $msg );
1039                 }
1040         }
1041
1042         /**
1043          * Perform the actions of a page purging
1044          */
1045         function doPurge() {
1046                 global $wgUseSquid;
1047                 // Invalidate the cache
1048                 $this->mTitle->invalidateCache();
1049
1050                 if ( $wgUseSquid ) {
1051                         // Commit the transaction before the purge is sent
1052                         $dbw = wfGetDB( DB_MASTER );
1053                         $dbw->immediateCommit();
1054
1055                         // Send purge
1056                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1057                         $update->doUpdate();
1058                 }
1059                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1060                         global $wgMessageCache;
1061                         if ( $this->getID() == 0 ) {
1062                                 $text = false;
1063                         } else {
1064                                 $text = $this->getContent();
1065                         }
1066                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1067                 }
1068                 $this->view();
1069         }
1070
1071         /**
1072          * Insert a new empty page record for this article.
1073          * This *must* be followed up by creating a revision
1074          * and running $this->updateToLatest( $rev_id );
1075          * or else the record will be left in a funky state.
1076          * Best if all done inside a transaction.
1077          *
1078          * @param Database $dbw
1079          * @return int     The newly created page_id key
1080          * @private
1081          */
1082         function insertOn( $dbw ) {
1083                 wfProfileIn( __METHOD__ );
1084
1085                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1086                 $dbw->insert( 'page', array(
1087                         'page_id'           => $page_id,
1088                         'page_namespace'    => $this->mTitle->getNamespace(),
1089                         'page_title'        => $this->mTitle->getDBkey(),
1090                         'page_counter'      => 0,
1091                         'page_restrictions' => '',
1092                         'page_is_redirect'  => 0, # Will set this shortly...
1093                         'page_is_new'       => 1,
1094                         'page_random'       => wfRandom(),
1095                         'page_touched'      => $dbw->timestamp(),
1096                         'page_latest'       => 0, # Fill this in shortly...
1097                         'page_len'          => 0, # Fill this in shortly...
1098                 ), __METHOD__ );
1099                 $newid = $dbw->insertId();
1100
1101                 $this->mTitle->resetArticleId( $newid );
1102
1103                 wfProfileOut( __METHOD__ );
1104                 return $newid;
1105         }
1106
1107         /**
1108          * Update the page record to point to a newly saved revision.
1109          *
1110          * @param Database $dbw
1111          * @param Revision $revision For ID number, and text used to set
1112                                      length and redirect status fields
1113          * @param int $lastRevision If given, will not overwrite the page field
1114          *                          when different from the currently set value.
1115          *                          Giving 0 indicates the new page flag should
1116          *                          be set on.
1117          * @param bool $lastRevIsRedirect If given, will optimize adding and
1118          *                                                      removing rows in redirect table.
1119          * @return bool true on success, false on failure
1120          * @private
1121          */
1122         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1123                 wfProfileIn( __METHOD__ );
1124
1125                 $text = $revision->getText();
1126                 $rt = Title::newFromRedirect( $text );
1127
1128                 $conditions = array( 'page_id' => $this->getId() );
1129                 if( !is_null( $lastRevision ) ) {
1130                         # An extra check against threads stepping on each other
1131                         $conditions['page_latest'] = $lastRevision;
1132                 }
1133
1134                 $dbw->update( 'page',
1135                         array( /* SET */
1136                                 'page_latest'      => $revision->getId(),
1137                                 'page_touched'     => $dbw->timestamp(),
1138                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1139                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1140                                 'page_len'         => strlen( $text ),
1141                         ),
1142                         $conditions,
1143                         __METHOD__ );
1144
1145                 $result = $dbw->affectedRows() != 0;
1146
1147                 if ($result) {
1148                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1149                 }
1150
1151                 wfProfileOut( __METHOD__ );
1152                 return $result;
1153         }
1154
1155         /**
1156          * Add row to the redirect table if this is a redirect, remove otherwise.
1157          *
1158          * @param Database $dbw
1159          * @param $redirectTitle a title object pointing to the redirect target,
1160          *                                                      or NULL if this is not a redirect
1161          * @param bool $lastRevIsRedirect If given, will optimize adding and
1162          *                                                      removing rows in redirect table.
1163          * @return bool true on success, false on failure
1164          * @private
1165          */
1166         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1167
1168                 // Always update redirects (target link might have changed)
1169                 // Update/Insert if we don't know if the last revision was a redirect or not
1170                 // Delete if changing from redirect to non-redirect
1171                 $isRedirect = !is_null($redirectTitle);
1172                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1173
1174                         wfProfileIn( __METHOD__ );
1175
1176                         if ($isRedirect) {
1177
1178                                 // This title is a redirect, Add/Update row in the redirect table
1179                                 $set = array( /* SET */
1180                                         'rd_namespace' => $redirectTitle->getNamespace(),
1181                                         'rd_title'     => $redirectTitle->getDBkey(),
1182                                         'rd_from'      => $this->getId(),
1183                                 );
1184
1185                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1186                         } else {
1187                                 // This is not a redirect, remove row from redirect table
1188                                 $where = array( 'rd_from' => $this->getId() );
1189                                 $dbw->delete( 'redirect', $where, __METHOD__);
1190                         }
1191
1192                         if( $this->getTitle()->getNamespace() == NS_IMAGE )
1193                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1194                         wfProfileOut( __METHOD__ );
1195                         return ( $dbw->affectedRows() != 0 );
1196                 }
1197
1198                 return true;
1199         }
1200
1201         /**
1202          * If the given revision is newer than the currently set page_latest,
1203          * update the page record. Otherwise, do nothing.
1204          *
1205          * @param Database $dbw
1206          * @param Revision $revision
1207          */
1208         function updateIfNewerOn( &$dbw, $revision ) {
1209                 wfProfileIn( __METHOD__ );
1210
1211                 $row = $dbw->selectRow(
1212                         array( 'revision', 'page' ),
1213                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1214                         array(
1215                                 'page_id' => $this->getId(),
1216                                 'page_latest=rev_id' ),
1217                         __METHOD__ );
1218                 if( $row ) {
1219                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1220                                 wfProfileOut( __METHOD__ );
1221                                 return false;
1222                         }
1223                         $prev = $row->rev_id;
1224                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1225                 } else {
1226                         # No or missing previous revision; mark the page as new
1227                         $prev = 0;
1228                         $lastRevIsRedirect = null;
1229                 }
1230
1231                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1232                 wfProfileOut( __METHOD__ );
1233                 return $ret;
1234         }
1235
1236         /**
1237          * @return string Complete article text, or null if error
1238          */
1239         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1240                 wfProfileIn( __METHOD__ );
1241
1242                 if( $section == '' ) {
1243                         // Whole-page edit; let the text through unmolested.
1244                 } else {
1245                         if( is_null( $edittime ) ) {
1246                                 $rev = Revision::newFromTitle( $this->mTitle );
1247                         } else {
1248                                 $dbw = wfGetDB( DB_MASTER );
1249                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1250                         }
1251                         if( is_null( $rev ) ) {
1252                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1253                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1254                                 return null;
1255                         }
1256                         $oldtext = $rev->getText();
1257
1258                         if( $section == 'new' ) {
1259                                 # Inserting a new section
1260                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1261                                 $text = strlen( trim( $oldtext ) ) > 0
1262                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1263                                                 : "{$subject}{$text}";
1264                         } else {
1265                                 # Replacing an existing section; roll out the big guns
1266                                 global $wgParser;
1267                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1268                         }
1269
1270                 }
1271
1272                 wfProfileOut( __METHOD__ );
1273                 return $text;
1274         }
1275
1276         /**
1277          * @deprecated use Article::doEdit()
1278          */
1279         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1280                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1281                         ( $isminor ? EDIT_MINOR : 0 ) |
1282                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1283                         ( $bot ? EDIT_FORCE_BOT : 0 );
1284
1285                 # If this is a comment, add the summary as headline
1286                 if ( $comment && $summary != "" ) {
1287                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1288                 }
1289
1290                 $this->doEdit( $text, $summary, $flags );
1291
1292                 $dbw = wfGetDB( DB_MASTER );
1293                 if ($watchthis) {
1294                         if (!$this->mTitle->userIsWatching()) {
1295                                 $dbw->begin();
1296                                 $this->doWatch();
1297                                 $dbw->commit();
1298                         }
1299                 } else {
1300                         if ( $this->mTitle->userIsWatching() ) {
1301                                 $dbw->begin();
1302                                 $this->doUnwatch();
1303                                 $dbw->commit();
1304                         }
1305                 }
1306                 $this->doRedirect( $this->isRedirect( $text ) );
1307         }
1308
1309         /**
1310          * @deprecated use Article::doEdit()
1311          */
1312         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1313                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1314                         ( $minor ? EDIT_MINOR : 0 ) |
1315                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1316
1317                 $good = $this->doEdit( $text, $summary, $flags );
1318                 if ( $good ) {
1319                         $dbw = wfGetDB( DB_MASTER );
1320                         if ($watchthis) {
1321                                 if (!$this->mTitle->userIsWatching()) {
1322                                         $dbw->begin();
1323                                         $this->doWatch();
1324                                         $dbw->commit();
1325                                 }
1326                         } else {
1327                                 if ( $this->mTitle->userIsWatching() ) {
1328                                         $dbw->begin();
1329                                         $this->doUnwatch();
1330                                         $dbw->commit();
1331                                 }
1332                         }
1333
1334                         $extraQuery = ''; // Give extensions a chance to modify URL query on update
1335                         wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1336
1337                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1338                 }
1339                 return $good;
1340         }
1341
1342         /**
1343          * Article::doEdit()
1344          *
1345          * Change an existing article or create a new article. Updates RC and all necessary caches,
1346          * optionally via the deferred update array.
1347          *
1348          * $wgUser must be set before calling this function.
1349          *
1350          * @param string $text New text
1351          * @param string $summary Edit summary
1352          * @param integer $flags bitfield:
1353          *      EDIT_NEW
1354          *          Article is known or assumed to be non-existent, create a new one
1355          *      EDIT_UPDATE
1356          *          Article is known or assumed to be pre-existing, update it
1357          *      EDIT_MINOR
1358          *          Mark this edit minor, if the user is allowed to do so
1359          *      EDIT_SUPPRESS_RC
1360          *          Do not log the change in recentchanges
1361          *      EDIT_FORCE_BOT
1362          *          Mark the edit a "bot" edit regardless of user rights
1363          *      EDIT_DEFER_UPDATES
1364          *          Defer some of the updates until the end of index.php
1365          *      EDIT_AUTOSUMMARY
1366          *          Fill in blank summaries with generated text where possible
1367          *
1368          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1369          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1370          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1371          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1372          * to MediaWiki's performance-optimised locking strategy.
1373          * @param $baseRevId, the revision ID this edit was based off, if any
1374          *
1375          * @return bool success
1376          */
1377         function doEdit( $text, $summary, $flags = 0, $baseRevId = false ) {
1378                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1379
1380                 wfProfileIn( __METHOD__ );
1381                 $good = true;
1382
1383                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1384                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1385                         if ( $aid ) {
1386                                 $flags |= EDIT_UPDATE;
1387                         } else {
1388                                 $flags |= EDIT_NEW;
1389                         }
1390                 }
1391
1392                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1393                         &$summary, $flags & EDIT_MINOR,
1394                         null, null, &$flags ) ) )
1395                 {
1396                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1397                         wfProfileOut( __METHOD__ );
1398                         return false;
1399                 }
1400
1401                 # Silently ignore EDIT_MINOR if not allowed
1402                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1403                 $bot = $flags & EDIT_FORCE_BOT;
1404
1405                 $oldtext = $this->getContent();
1406                 $oldsize = strlen( $oldtext );
1407
1408                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1409                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1410                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1411                 }
1412
1413                 $editInfo = $this->prepareTextForEdit( $text );
1414                 $text = $editInfo->pst;
1415                 $newsize = strlen( $text );
1416
1417                 $dbw = wfGetDB( DB_MASTER );
1418                 $now = wfTimestampNow();
1419
1420                 if ( $flags & EDIT_UPDATE ) {
1421                         # Update article, but only if changed.
1422
1423                         # Make sure the revision is either completely inserted or not inserted at all
1424                         if( !$wgDBtransactions ) {
1425                                 $userAbort = ignore_user_abort( true );
1426                         }
1427
1428                         $lastRevision = 0;
1429                         $revisionId = 0;
1430
1431                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1432
1433                         if ( $changed ) {
1434                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1435                                   - (int)$this->isCountable( $oldtext );
1436                                 $this->mTotalAdjustment = 0;
1437
1438                                 $lastRevision = $dbw->selectField(
1439                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1440
1441                                 if ( !$lastRevision ) {
1442                                         # Article gone missing
1443                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1444                                         wfProfileOut( __METHOD__ );
1445                                         return false;
1446                                 }
1447
1448                                 $revision = new Revision( array(
1449                                         'page'       => $this->getId(),
1450                                         'comment'    => $summary,
1451                                         'minor_edit' => $isminor,
1452                                         'text'       => $text,
1453                                         'parent_id'  => $lastRevision
1454                                         ) );
1455
1456                                 $dbw->begin();
1457                                 $revisionId = $revision->insertOn( $dbw );
1458
1459                                 # Update page
1460                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1461
1462                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId) );
1463
1464                                 if( !$ok ) {
1465                                         /* Belated edit conflict! Run away!! */
1466                                         $good = false;
1467                                         $dbw->rollback();
1468                                 } else {
1469                                         # Update recentchanges
1470                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1471                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1472                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1473                                                         $revisionId );
1474
1475                                                 # Mark as patrolled if the user can do so
1476                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1477                                                         RecentChange::markPatrolled( $rcid );
1478                                                         PatrolLog::record( $rcid, true );
1479                                                 }
1480                                         }
1481                                         $wgUser->incEditCount();
1482                                         $dbw->commit();
1483                                 }
1484                         } else {
1485                                 $revision = null;
1486                                 // Keep the same revision ID, but do some updates on it
1487                                 $revisionId = $this->getRevIdFetched();
1488                                 // Update page_touched, this is usually implicit in the page update
1489                                 // Other cache updates are done in onArticleEdit()
1490                                 $this->mTitle->invalidateCache();
1491                         }
1492
1493                         if( !$wgDBtransactions ) {
1494                                 ignore_user_abort( $userAbort );
1495                         }
1496
1497                         if ( $good ) {
1498                                 # Invalidate cache of this article and all pages using this article
1499                                 # as a template. Partly deferred.
1500                                 Article::onArticleEdit( $this->mTitle );
1501
1502                                 # Update links tables, site stats, etc.
1503                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1504                         }
1505                 } else {
1506                         # Create new article
1507
1508                         # Set statistics members
1509                         # We work out if it's countable after PST to avoid counter drift
1510                         # when articles are created with {{subst:}}
1511                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1512                         $this->mTotalAdjustment = 1;
1513
1514                         $dbw->begin();
1515
1516                         # Add the page record; stake our claim on this title!
1517                         # This will fail with a database query exception if the article already exists
1518                         $newid = $this->insertOn( $dbw );
1519
1520                         # Save the revision text...
1521                         $revision = new Revision( array(
1522                                 'page'       => $newid,
1523                                 'comment'    => $summary,
1524                                 'minor_edit' => $isminor,
1525                                 'text'       => $text
1526                                 ) );
1527                         $revisionId = $revision->insertOn( $dbw );
1528
1529                         $this->mTitle->resetArticleID( $newid );
1530
1531                         # Update the page record with revision data
1532                         $this->updateRevisionOn( $dbw, $revision, 0 );
1533
1534                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
1535
1536                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1537                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1538                                   '', strlen( $text ), $revisionId );
1539                                 # Mark as patrolled if the user can
1540                                 if( ($GLOBALS['wgUseRCPatrol'] || $GLOBALS['wgUseNPPatrol']) && $wgUser->isAllowed( 'autopatrol' ) ) {
1541                                         RecentChange::markPatrolled( $rcid );
1542                                         PatrolLog::record( $rcid, true );
1543                                 }
1544                         }
1545                         $wgUser->incEditCount();
1546                         $dbw->commit();
1547
1548                         # Update links, etc.
1549                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1550
1551                         # Clear caches
1552                         Article::onArticleCreate( $this->mTitle );
1553
1554                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text, $summary,
1555                          $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1556                 }
1557
1558                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1559                         wfDoUpdates();
1560                 }
1561
1562                 if ( $good ) {
1563                         wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary,
1564                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1565                 }
1566
1567                 wfProfileOut( __METHOD__ );
1568                 return $good;
1569         }
1570
1571         /**
1572          * @deprecated wrapper for doRedirect
1573          */
1574         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1575                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1576         }
1577
1578         /**
1579          * Output a redirect back to the article.
1580          * This is typically used after an edit.
1581          *
1582          * @param boolean $noRedir Add redirect=no
1583          * @param string $sectionAnchor section to redirect to, including "#"
1584          * @param string $extraQuery, extra query params
1585          */
1586         function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1587                 global $wgOut;
1588                 if ( $noRedir ) {
1589                         $query = 'redirect=no';
1590                         if( $extraQuery )
1591                                 $query .= "&$query";
1592                 } else {
1593                         $query = $extraQuery;
1594                 }
1595                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1596         }
1597
1598         /**
1599          * Mark this particular edit/page as patrolled
1600          */
1601         function markpatrolled() {
1602                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1603                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1604
1605                 # Check patrol config options
1606
1607                 if ( !($wgUseNPPatrol || $wgUseRCPatrol)) {
1608                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1609                         return;
1610                 }
1611
1612                 # If we haven't been given an rc_id value, we can't do anything
1613                 $rcid = (int) $wgRequest->getVal('rcid');
1614                 $rc = $rcid ? RecentChange::newFromId($rcid) : null;
1615                 if ( is_null ( $rc ) )
1616                 {
1617                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1618                         return;
1619                 }
1620
1621                 if ( !$wgUseRCPatrol && $rc->getAttribute( 'rc_type' ) != RC_NEW) {
1622                         // Only new pages can be patrolled if the general patrolling is off....???
1623                         // @fixme -- is this necessary? Shouldn't we only bother controlling the
1624                         // front end here?
1625                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1626                         return;
1627                 }
1628
1629                 # Check permissions
1630                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'patrol', $wgUser );
1631
1632                 if (count($permission_errors)>0)
1633                 {
1634                         $wgOut->showPermissionsErrorPage( $permission_errors );
1635                         return;
1636                 }
1637
1638                 # Handle the 'MarkPatrolled' hook
1639                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1640                         return;
1641                 }
1642
1643                 #It would be nice to see where the user had actually come from, but for now just guess
1644                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1645                 $return = Title::makeTitle( NS_SPECIAL, $returnto );
1646
1647                 # If it's left up to us, check that the user is allowed to patrol this edit
1648                 # If the user has the "autopatrol" right, then we'll assume there are no
1649                 # other conditions stopping them doing so
1650                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1651                         $rc = RecentChange::newFromId( $rcid );
1652                         # Graceful error handling, as we've done before here...
1653                         # (If the recent change doesn't exist, then it doesn't matter whether
1654                         # the user is allowed to patrol it or not; nothing is going to happen
1655                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1656                                 # The user made this edit, and can't patrol it
1657                                 # Tell them so, and then back off
1658                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1659                                 $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1660                                 $wgOut->returnToMain( false, $return );
1661                                 return;
1662                         }
1663                 }
1664
1665                 # Check that the revision isn't patrolled already
1666                 # Prevents duplicate log entries
1667                 if( !$rc->getAttribute( 'rc_patrolled' ) ) {
1668                         # Mark the edit as patrolled
1669                         RecentChange::markPatrolled( $rcid );
1670                         PatrolLog::record( $rcid );
1671                         wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1672                 }
1673
1674                 # Inform the user
1675                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1676                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1677                 $wgOut->returnToMain( false, $return );
1678         }
1679
1680         /**
1681          * User-interface handler for the "watch" action
1682          */
1683
1684         function watch() {
1685
1686                 global $wgUser, $wgOut;
1687
1688                 if ( $wgUser->isAnon() ) {
1689                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1690                         return;
1691                 }
1692                 if ( wfReadOnly() ) {
1693                         $wgOut->readOnlyPage();
1694                         return;
1695                 }
1696
1697                 if( $this->doWatch() ) {
1698                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1699                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1700
1701                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1702                 }
1703
1704                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1705         }
1706
1707         /**
1708          * Add this page to $wgUser's watchlist
1709          * @return bool true on successful watch operation
1710          */
1711         function doWatch() {
1712                 global $wgUser;
1713                 if( $wgUser->isAnon() ) {
1714                         return false;
1715                 }
1716
1717                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1718                         $wgUser->addWatch( $this->mTitle );
1719
1720                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1721                 }
1722
1723                 return false;
1724         }
1725
1726         /**
1727          * User interface handler for the "unwatch" action.
1728          */
1729         function unwatch() {
1730
1731                 global $wgUser, $wgOut;
1732
1733                 if ( $wgUser->isAnon() ) {
1734                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1735                         return;
1736                 }
1737                 if ( wfReadOnly() ) {
1738                         $wgOut->readOnlyPage();
1739                         return;
1740                 }
1741
1742                 if( $this->doUnwatch() ) {
1743                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1744                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1745
1746                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1747                 }
1748
1749                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1750         }
1751
1752         /**
1753          * Stop watching a page
1754          * @return bool true on successful unwatch
1755          */
1756         function doUnwatch() {
1757                 global $wgUser;
1758                 if( $wgUser->isAnon() ) {
1759                         return false;
1760                 }
1761
1762                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1763                         $wgUser->removeWatch( $this->mTitle );
1764
1765                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1766                 }
1767
1768                 return false;
1769         }
1770
1771         /**
1772          * action=protect handler
1773          */
1774         function protect() {
1775                 $form = new ProtectionForm( $this );
1776                 $form->execute();
1777         }
1778
1779         /**
1780          * action=unprotect handler (alias)
1781          */
1782         function unprotect() {
1783                 $this->protect();
1784         }
1785
1786         /**
1787          * Update the article's restriction field, and leave a log entry.
1788          *
1789          * @param array $limit set of restriction keys
1790          * @param string $reason
1791          * @return bool true on success
1792          */
1793         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1794                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1795
1796                 $id = $this->mTitle->getArticleID();
1797                 if( array() != $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser ) || wfReadOnly() || $id == 0 ) {
1798                         return false;
1799                 }
1800
1801                 if (!$cascade) {
1802                         $cascade = false;
1803                 }
1804
1805                 // Take this opportunity to purge out expired restrictions
1806                 Title::purgeExpiredRestrictions();
1807
1808                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1809                 # we expect a single selection, but the schema allows otherwise.
1810                 $current = array();
1811                 foreach( $wgRestrictionTypes as $action )
1812                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1813
1814                 $current = Article::flattenRestrictions( $current );
1815                 $updated = Article::flattenRestrictions( $limit );
1816
1817                 $changed = ( $current != $updated );
1818                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1819                 $changed = $changed || ($updated && $this->mTitle->mRestrictionsExpiry != $expiry);
1820                 $protect = ( $updated != '' );
1821
1822                 # If nothing's changed, do nothing
1823                 if( $changed ) {
1824                         global $wgGroupPermissions;
1825                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1826
1827                                 $dbw = wfGetDB( DB_MASTER );
1828
1829                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1830
1831                                 $expiry_description = '';
1832                                 if ( $encodedExpiry != 'infinity' ) {
1833                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry, false, false ) ).')';
1834                                 }
1835
1836                                 # Prepare a null revision to be added to the history
1837                                 $modified = $current != '' && $protect;
1838                                 if ( $protect ) {
1839                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1840                                 } else {
1841                                         $comment_type = 'unprotectedarticle';
1842                                 }
1843                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1844
1845                                 # Only restrictions with the 'protect' right can cascade...
1846                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1847                                 foreach( $limit as $action => $restriction ) {
1848                                         # FIXME: can $restriction be an array or what? (same as fixme above)
1849                                         if( $restriction != 'protect' && $restriction != 'sysop' ) {
1850                                                 $cascade = false;
1851                                                 break;
1852                                         }
1853                                 }
1854
1855                                 $cascade_description = '';
1856                                 if ($cascade) {
1857                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1858                                 }
1859
1860                                 if( $reason )
1861                                         $comment .= ": $reason";
1862                                 if( $protect )
1863                                         $comment .= " [$updated]";
1864                                 if ( $expiry_description && $protect )
1865                                         $comment .= "$expiry_description";
1866                                 if ( $cascade )
1867                                         $comment .= "$cascade_description";
1868
1869                                 # Update restrictions table
1870                                 foreach( $limit as $action => $restrictions ) {
1871                                         if ($restrictions != '' ) {
1872                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1873                                                         array( 'pr_page' => $id, 'pr_type' => $action
1874                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1875                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1876                                         } else {
1877                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1878                                                         'pr_type' => $action ), __METHOD__ );
1879                                         }
1880                                 }
1881
1882                                 # Insert a null revision
1883                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1884                                 $nullRevId = $nullRevision->insertOn( $dbw );
1885
1886                                 # Update page record
1887                                 $dbw->update( 'page',
1888                                         array( /* SET */
1889                                                 'page_touched' => $dbw->timestamp(),
1890                                                 'page_restrictions' => '',
1891                                                 'page_latest' => $nullRevId
1892                                         ), array( /* WHERE */
1893                                                 'page_id' => $id
1894                                         ), 'Article::protect'
1895                                 );
1896
1897                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, false) );
1898                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1899
1900                                 # Update the protection log
1901                                 $log = new LogPage( 'protect' );
1902                                 if( $protect ) {
1903                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle,
1904                                                 trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1905                                 } else {
1906                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1907                                 }
1908
1909                         } # End hook
1910                 } # End "changed" check
1911
1912                 return true;
1913         }
1914
1915         /**
1916          * Take an array of page restrictions and flatten it to a string
1917          * suitable for insertion into the page_restrictions field.
1918          * @param array $limit
1919          * @return string
1920          * @private
1921          */
1922         function flattenRestrictions( $limit ) {
1923                 if( !is_array( $limit ) ) {
1924                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1925                 }
1926                 $bits = array();
1927                 ksort( $limit );
1928                 foreach( $limit as $action => $restrictions ) {
1929                         if( $restrictions != '' ) {
1930                                 $bits[] = "$action=$restrictions";
1931                         }
1932                 }
1933                 return implode( ':', $bits );
1934         }
1935
1936         /**
1937          * Auto-generates a deletion reason
1938          * @param bool &$hasHistory Whether the page has a history
1939          */
1940         public function generateReason(&$hasHistory)
1941         {
1942                 global $wgContLang;
1943                 $dbw = wfGetDB(DB_MASTER);
1944                 // Get the last revision
1945                 $rev = Revision::newFromTitle($this->mTitle);
1946                 if(is_null($rev))
1947                         return false;
1948                 // Get the article's contents
1949                 $contents = $rev->getText();
1950                 $blank = false;
1951                 // If the page is blank, use the text from the previous revision,
1952                 // which can only be blank if there's a move/import/protect dummy revision involved
1953                 if($contents == '')
1954                 {
1955                         $prev = $rev->getPrevious();
1956                         if($prev)
1957                         {
1958                                 $contents = $prev->getText();
1959                                 $blank = true;
1960                         }
1961                 }
1962
1963                 // Find out if there was only one contributor
1964                 // Only scan the last 20 revisions
1965                 $limit = 20;
1966                 $res = $dbw->select('revision', 'rev_user_text', array('rev_page' => $this->getID()), __METHOD__,
1967                                 array('LIMIT' => $limit));
1968                 if($res === false)
1969                         // This page has no revisions, which is very weird
1970                         return false;
1971                 if($res->numRows() > 1)
1972                                 $hasHistory = true;
1973                 else
1974                                 $hasHistory = false;
1975                 $row = $dbw->fetchObject($res);
1976                 $onlyAuthor = $row->rev_user_text;
1977                 // Try to find a second contributor
1978                 while( $row = $dbw->fetchObject($res) ) {
1979                         if($row->rev_user_text != $onlyAuthor) {
1980                                 $onlyAuthor = false;
1981                                 break;
1982                         }
1983                 }
1984                 $dbw->freeResult($res);
1985
1986                 // Generate the summary with a '$1' placeholder
1987                 if($blank) {
1988                         // The current revision is blank and the one before is also
1989                         // blank. It's just not our lucky day
1990                         $reason = wfMsgForContent('exbeforeblank', '$1');
1991                 } else {
1992                         if($onlyAuthor)
1993                                 $reason = wfMsgForContent('excontentauthor', '$1', $onlyAuthor);
1994                         else
1995                                 $reason = wfMsgForContent('excontent', '$1');
1996                 }
1997
1998                 // Replace newlines with spaces to prevent uglyness
1999                 $contents = preg_replace("/[\n\r]/", ' ', $contents);
2000                 // Calculate the maximum amount of chars to get
2001                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2002                 $maxLength = 255 - (strlen($reason) - 2) - 3;
2003                 $contents = $wgContLang->truncate($contents, $maxLength, '...');
2004                 // Remove possible unfinished links
2005                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2006                 // Now replace the '$1' placeholder
2007                 $reason = str_replace( '$1', $contents, $reason );
2008                 return $reason;
2009         }
2010
2011
2012         /*
2013          * UI entry point for page deletion
2014          */
2015         function delete() {
2016                 global $wgUser, $wgOut, $wgRequest;
2017
2018                 $confirm = $wgRequest->wasPosted() &&
2019                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2020
2021                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2022                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2023
2024                 $reason = $this->DeleteReasonList;
2025
2026                 if ( $reason != 'other' && $this->DeleteReason != '') {
2027                         // Entry from drop down menu + additional comment
2028                         $reason .= ': ' . $this->DeleteReason;
2029                 } elseif ( $reason == 'other' ) {
2030                         $reason = $this->DeleteReason;
2031                 }
2032                 # Flag to hide all contents of the archived revisions
2033                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed('suppressrevision');
2034
2035                 # This code desperately needs to be totally rewritten
2036
2037                 # Read-only check...
2038                 if ( wfReadOnly() ) {
2039                         $wgOut->readOnlyPage();
2040                         return;
2041                 }
2042
2043                 # Check permissions
2044                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2045
2046                 if (count($permission_errors)>0) {
2047                         $wgOut->showPermissionsErrorPage( $permission_errors );
2048                         return;
2049                 }
2050
2051                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2052
2053                 # Better double-check that it hasn't been deleted yet!
2054                 $dbw = wfGetDB( DB_MASTER );
2055                 $conds = $this->mTitle->pageCond();
2056                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2057                 if ( $latest === false ) {
2058                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2059                         return;
2060                 }
2061
2062                 # Hack for big sites
2063                 $bigHistory = $this->isBigDeletion();
2064                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2065                         global $wgLang, $wgDeleteRevisionsLimit;
2066                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2067                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2068                         return;
2069                 }
2070
2071                 if( $confirm ) {
2072                         $this->doDelete( $reason, $suppress );
2073                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2074                                 $this->doWatch();
2075                         } elseif( $this->mTitle->userIsWatching() ) {
2076                                 $this->doUnwatch();
2077                         }
2078                         return;
2079                 }
2080
2081                 // Generate deletion reason
2082                 $hasHistory = false;
2083                 if ( !$reason ) $reason = $this->generateReason($hasHistory);
2084
2085                 // If the page has a history, insert a warning
2086                 if( $hasHistory && !$confirm ) {
2087                         $skin=$wgUser->getSkin();
2088                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
2089                         if( $bigHistory ) {
2090                                 global $wgLang, $wgDeleteRevisionsLimit;
2091                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2092                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2093                         }
2094                 }
2095
2096                 return $this->confirmDelete( '', $reason );
2097         }
2098
2099         /**
2100          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2101          */
2102         function isBigDeletion() {
2103                 global $wgDeleteRevisionsLimit;
2104                 if( $wgDeleteRevisionsLimit ) {
2105                         $revCount = $this->estimateRevisionCount();
2106                         return $revCount > $wgDeleteRevisionsLimit;
2107                 }
2108                 return false;
2109         }
2110
2111         /**
2112          * @return int approximate revision count
2113          */
2114         function estimateRevisionCount() {
2115                 $dbr = wfGetDB();
2116                 // For an exact count...
2117                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2118                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2119                 return $dbr->estimateRowCount( 'revision', '*',
2120                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2121         }
2122
2123         /**
2124          * Get the last N authors
2125          * @param int $num Number of revisions to get
2126          * @param string $revLatest The latest rev_id, selected from the master (optional)
2127          * @return array Array of authors, duplicates not removed
2128          */
2129         function getLastNAuthors( $num, $revLatest = 0 ) {
2130                 wfProfileIn( __METHOD__ );
2131
2132                 // First try the slave
2133                 // If that doesn't have the latest revision, try the master
2134                 $continue = 2;
2135                 $db = wfGetDB( DB_SLAVE );
2136                 do {
2137                         $res = $db->select( array( 'page', 'revision' ),
2138                                 array( 'rev_id', 'rev_user_text' ),
2139                                 array(
2140                                         'page_namespace' => $this->mTitle->getNamespace(),
2141                                         'page_title' => $this->mTitle->getDBkey(),
2142                                         'rev_page = page_id'
2143                                 ), __METHOD__, $this->getSelectOptions( array(
2144                                         'ORDER BY' => 'rev_timestamp DESC',
2145                                         'LIMIT' => $num
2146                                 ) )
2147                         );
2148                         if ( !$res ) {
2149                                 wfProfileOut( __METHOD__ );
2150                                 return array();
2151                         }
2152                         $row = $db->fetchObject( $res );
2153                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2154                                 $db = wfGetDB( DB_MASTER );
2155                                 $continue--;
2156                         } else {
2157                                 $continue = 0;
2158                         }
2159                 } while ( $continue );
2160
2161                 $authors = array( $row->rev_user_text );
2162                 while ( $row = $db->fetchObject( $res ) ) {
2163                         $authors[] = $row->rev_user_text;
2164                 }
2165                 wfProfileOut( __METHOD__ );
2166                 return $authors;
2167         }
2168
2169         /**
2170          * Output deletion confirmation dialog
2171          * @param $par string FIXME: do we need this parameter? One Call from Article::delete with '' only.
2172          * @param $reason string Prefilled reason
2173          */
2174         function confirmDelete( $par, $reason ) {
2175                 global $wgOut, $wgUser, $wgContLang;
2176                 $align = $wgContLang->isRtl() ? 'left' : 'right';
2177
2178                 wfDebug( "Article::confirmDelete\n" );
2179
2180                 $wgOut->setSubtitle( wfMsg( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2181                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2182                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2183
2184                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2185                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\"><td></td><td>";
2186                         $suppress .= Xml::checkLabel( wfMsg( 'revdelete-suppress' ), 'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '2' ) );
2187                         $suppress .= "</td></tr>";
2188                 } else {
2189                         $suppress = '';
2190                 }
2191
2192                 $form = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->mTitle->getLocalURL( 'action=delete' . $par ), 'id' => 'deleteconfirm' ) ) .
2193                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2194                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2195                         Xml::openElement( 'table' ) .
2196                         "<tr id=\"wpDeleteReasonListRow\">
2197                                 <td align='$align'>" .
2198                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2199                                 "</td>
2200                                 <td>" .
2201                                         Xml::listDropDown( 'wpDeleteReasonList',
2202                                                 wfMsgForContent( 'deletereason-dropdown' ),
2203                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2204                                 "</td>
2205                         </tr>
2206                         <tr id=\"wpDeleteReasonRow\">
2207                                 <td align='$align'>" .
2208                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2209                                 "</td>
2210                                 <td>" .
2211                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255', 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2212                                 "</td>
2213                         </tr>
2214                         <tr>
2215                                 <td></td>
2216                                 <td>" .
2217                                         Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '3' ) ) .
2218                                 "</td>
2219                         </tr>
2220                         $suppress
2221                         <tr>
2222                                 <td></td>
2223                                 <td>" .
2224                                         Xml::submitButton( wfMsg( 'deletepage' ), array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '4' ) ) .
2225                                 "</td>
2226                         </tr>" .
2227                         Xml::closeElement( 'table' ) .
2228                         Xml::closeElement( 'fieldset' ) .
2229                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2230                         Xml::closeElement( 'form' );
2231
2232                         if ( $wgUser->isAllowed( 'editinterface' ) ) {
2233                                 $skin = $wgUser->getSkin();
2234                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2235                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2236                         }
2237
2238                 $wgOut->addHTML( $form );
2239                 $this->showLogExtract( $wgOut );
2240         }
2241
2242
2243         /**
2244          * Show relevant lines from the deletion log
2245          */
2246         function showLogExtract( $out ) {
2247                 $out->addHtml( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2248                 LogEventsList::showLogExtract( $out, 'delete', $this->mTitle->getPrefixedText() );
2249         }
2250
2251
2252         /**
2253          * Perform a deletion and output success or failure messages
2254          */
2255         function doDelete( $reason, $suppress = false ) {
2256                 global $wgOut, $wgUser;
2257                 wfDebug( __METHOD__."\n" );
2258
2259                 $id = $this->getId();
2260
2261                 $error = '';
2262
2263                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error))) {
2264                         if ( $this->doDeleteArticle( $reason, $suppress ) ) {
2265                                 $deleted = $this->mTitle->getPrefixedText();
2266
2267                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2268                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2269
2270                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2271
2272                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2273                                 $wgOut->returnToMain( false );
2274                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2275                         } else {
2276                                 if ($error = '')
2277                                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2278                                 else
2279                                         $wgOut->showFatalError( $error );
2280                         }
2281                 }
2282         }
2283
2284         /**
2285          * Back-end article deletion
2286          * Deletes the article with database consistency, writes logs, purges caches
2287          * Returns success
2288          */
2289         function doDeleteArticle( $reason, $suppress = false ) {
2290                 global $wgUseSquid, $wgDeferredUpdateList;
2291                 global $wgUseTrackbacks;
2292
2293                 wfDebug( __METHOD__."\n" );
2294
2295                 $dbw = wfGetDB( DB_MASTER );
2296                 $ns = $this->mTitle->getNamespace();
2297                 $t = $this->mTitle->getDBkey();
2298                 $id = $this->mTitle->getArticleID();
2299
2300                 if ( $t == '' || $id == 0 ) {
2301                         return false;
2302                 }
2303
2304                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2305                 array_push( $wgDeferredUpdateList, $u );
2306
2307                 // Bitfields to further suppress the content
2308                 if ( $suppress ) {
2309                         $bitfield = 0;
2310                         // This should be 15...
2311                         $bitfield |= Revision::DELETED_TEXT;
2312                         $bitfield |= Revision::DELETED_COMMENT;
2313                         $bitfield |= Revision::DELETED_USER;
2314                         $bitfield |= Revision::DELETED_RESTRICTED;
2315                 } else {
2316                         $bitfield = 'rev_deleted';
2317                 }
2318
2319                 $dbw->begin();
2320                 // For now, shunt the revision data into the archive table.
2321                 // Text is *not* removed from the text table; bulk storage
2322                 // is left intact to avoid breaking block-compression or
2323                 // immutable storage schemes.
2324                 //
2325                 // For backwards compatibility, note that some older archive
2326                 // table entries will have ar_text and ar_flags fields still.
2327                 //
2328                 // In the future, we may keep revisions and mark them with
2329                 // the rev_deleted field, which is reserved for this purpose.
2330                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2331                         array(
2332                                 'ar_namespace'  => 'page_namespace',
2333                                 'ar_title'      => 'page_title',
2334                                 'ar_comment'    => 'rev_comment',
2335                                 'ar_user'       => 'rev_user',
2336                                 'ar_user_text'  => 'rev_user_text',
2337                                 'ar_timestamp'  => 'rev_timestamp',
2338                                 'ar_minor_edit' => 'rev_minor_edit',
2339                                 'ar_rev_id'     => 'rev_id',
2340                                 'ar_text_id'    => 'rev_text_id',
2341                                 'ar_text'       => '\'\'', // Be explicit to appease
2342                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2343                                 'ar_len'        => 'rev_len',
2344                                 'ar_page_id'    => 'page_id',
2345                                 'ar_deleted'    => $bitfield
2346                         ), array(
2347                                 'page_id' => $id,
2348                                 'page_id = rev_page'
2349                         ), __METHOD__
2350                 );
2351
2352                 # Delete restrictions for it
2353                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2354
2355                 # Fix category table counts
2356                 $cats = array();
2357                 $res = $dbw->select( 'categorylinks', 'cl_to',
2358                         array( 'cl_from' => $id ), __METHOD__ );
2359                 foreach( $res as $row ) {
2360                         $cats []= $row->cl_to;
2361                 }
2362                 $this->updateCategoryCounts( array(), $cats );
2363
2364                 # Now that it's safely backed up, delete it
2365                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2366                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2367                 if( !$ok ) {
2368                         $dbw->rollback();
2369                         return false;
2370                 }
2371
2372                 # If using cascading deletes, we can skip some explicit deletes
2373                 if ( !$dbw->cascadingDeletes() ) {
2374                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2375
2376                         if ($wgUseTrackbacks)
2377                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2378
2379                         # Delete outgoing links
2380                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2381                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2382                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2383                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2384                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2385                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2386                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2387                 }
2388
2389                 # If using cleanup triggers, we can skip some manual deletes
2390                 if ( !$dbw->cleanupTriggers() ) {
2391
2392                         # Clean up recentchanges entries...
2393                         $dbw->delete( 'recentchanges',
2394                                 array( 'rc_namespace' => $ns, 'rc_title' => $t, 'rc_type != '.RC_LOG ),
2395                                 __METHOD__ );
2396                 }
2397                 $dbw->commit();
2398
2399                 # Clear caches
2400                 Article::onArticleDelete( $this->mTitle );
2401
2402                 # Clear the cached article id so the interface doesn't act like we exist
2403                 $this->mTitle->resetArticleID( 0 );
2404                 $this->mTitle->mArticleID = 0;
2405
2406                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2407                 $logtype = $suppress ? 'suppress' : 'delete';
2408                 $log = new LogPage( $logtype );
2409
2410                 # Make sure logging got through
2411                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2412
2413                 return true;
2414         }
2415
2416         /**
2417          * Roll back the most recent consecutive set of edits to a page
2418          * from the same user; fails if there are no eligible edits to
2419          * roll back to, e.g. user is the sole contributor. This function
2420          * performs permissions checks on $wgUser, then calls commitRollback()
2421          * to do the dirty work
2422          *
2423          * @param string $fromP - Name of the user whose edits to rollback.
2424          * @param string $summary - Custom summary. Set to default summary if empty.
2425          * @param string $token - Rollback token.
2426          * @param bool   $bot - If true, mark all reverted edits as bot.
2427          *
2428          * @param array $resultDetails contains result-specific array of additional values
2429          *    'alreadyrolled' : 'current' (rev)
2430          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2431          *
2432          * @return array of errors, each error formatted as
2433          *   array(messagekey, param1, param2, ...).
2434          * On success, the array is empty.  This array can also be passed to
2435          * OutputPage::showPermissionsErrorPage().
2436          */
2437         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2438                 global $wgUser;
2439                 $resultDetails = null;
2440
2441                 # Check permissions
2442                 $errors = array_merge( $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser ),
2443                                                 $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser ) );
2444                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2445                         $errors[] = array( 'sessionfailure' );
2446
2447                 if ( $wgUser->pingLimiter('rollback') || $wgUser->pingLimiter() ) {
2448                         $errors[] = array( 'actionthrottledtext' );
2449                 }
2450                 # If there were errors, bail out now
2451                 if(!empty($errors))
2452                         return $errors;
2453
2454                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2455         }
2456
2457         /**
2458          * Backend implementation of doRollback(), please refer there for parameter
2459          * and return value documentation
2460          *
2461          * NOTE: This function does NOT check ANY permissions, it just commits the
2462          * rollback to the DB Therefore, you should only call this function direct-
2463          * ly if you want to use custom permissions checks. If you don't, use
2464          * doRollback() instead.
2465          */
2466         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2467                 global $wgUseRCPatrol, $wgUser, $wgLang;
2468                 $dbw = wfGetDB( DB_MASTER );
2469
2470                 if( wfReadOnly() ) {
2471                         return array( array( 'readonlytext' ) );
2472                 }
2473
2474                 # Get the last editor
2475                 $current = Revision::newFromTitle( $this->mTitle );
2476                 if( is_null( $current ) ) {
2477                         # Something wrong... no page?
2478                         return array(array('notanarticle'));
2479                 }
2480
2481                 $from = str_replace( '_', ' ', $fromP );
2482                 if( $from != $current->getUserText() ) {
2483                         $resultDetails = array( 'current' => $current );
2484                         return array(array('alreadyrolled',
2485                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2486                                 htmlspecialchars($fromP),
2487                                 htmlspecialchars($current->getUserText())
2488                         ));
2489                 }
2490
2491                 # Get the last edit not by this guy
2492                 $user = intval( $current->getUser() );
2493                 $user_text = $dbw->addQuotes( $current->getUserText() );
2494                 $s = $dbw->selectRow( 'revision',
2495                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2496                         array(  'rev_page' => $current->getPage(),
2497                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2498                         ), __METHOD__,
2499                         array(  'USE INDEX' => 'page_timestamp',
2500                                 'ORDER BY'  => 'rev_timestamp DESC' )
2501                         );
2502                 if( $s === false ) {
2503                         # No one else ever edited this page
2504                         return array(array('cantrollback'));
2505                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2506                         # Only admins can see this text
2507                         return array(array('notvisiblerev'));
2508                 }
2509
2510                 $set = array();
2511                 if ( $bot && $wgUser->isAllowed('markbotedits') ) {
2512                         # Mark all reverted edits as bot
2513                         $set['rc_bot'] = 1;
2514                 }
2515                 if ( $wgUseRCPatrol ) {
2516                         # Mark all reverted edits as patrolled
2517                         $set['rc_patrolled'] = 1;
2518                 }
2519
2520                 if ( $set ) {
2521                         $dbw->update( 'recentchanges', $set,
2522                                         array( /* WHERE */
2523                                                 'rc_cur_id' => $current->getPage(),
2524                                                 'rc_user_text' => $current->getUserText(),
2525                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2526                                         ), __METHOD__
2527                                 );
2528                 }
2529
2530                 # Generate the edit summary if necessary
2531                 $target = Revision::newFromId( $s->rev_id );
2532                 if( empty( $summary ) ){
2533                         $summary = wfMsgForContent( 'revertpage' );
2534                 }
2535
2536                 # Allow the custom summary to use the same args as the default message
2537                 $args = array(
2538                         $target->getUserText(), $from, $s->rev_id,
2539                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2540                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2541                 );
2542                 $summary = wfMsgReplaceArgs( $summary, $args );
2543
2544                 # Save
2545                 $flags = EDIT_UPDATE;
2546
2547                 if ($wgUser->isAllowed('minoredit'))
2548                         $flags |= EDIT_MINOR;
2549
2550                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2551                         $flags |= EDIT_FORCE_BOT;
2552                 $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2553
2554                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target ) );
2555
2556                 $resultDetails = array(
2557                         'summary' => $summary,
2558                         'current' => $current,
2559                         'target' => $target,
2560                 );
2561                 return array();
2562         }
2563
2564         /**
2565          * User interface for rollback operations
2566          */
2567         function rollback() {
2568                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2569                 $details = null;
2570
2571                 $result = $this->doRollback(
2572                         $wgRequest->getVal( 'from' ),
2573                         $wgRequest->getText( 'summary' ),
2574                         $wgRequest->getVal( 'token' ),
2575                         $wgRequest->getBool( 'bot' ),
2576                         $details
2577                 );
2578
2579                 if( in_array( array( 'blocked' ), $result ) ) {
2580                         $wgOut->blockedPage();
2581                         return;
2582                 }
2583                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2584                         $wgOut->rateLimited();
2585                         return;
2586                 }
2587                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ){
2588                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2589                         $errArray = $result[0];
2590                         $errMsg = array_shift( $errArray );
2591                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2592                         if( isset( $details['current'] ) ){
2593                                 $current = $details['current'];
2594                                 if( $current->getComment() != '' ) {
2595                                         $wgOut->addWikiMsgArray( 'editcomment', array( $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2596                                 }
2597                         }
2598                         return;
2599                 }
2600                 # Display permissions errors before read-only message -- there's no
2601                 # point in misleading the user into thinking the inability to rollback
2602                 # is only temporary.
2603                 if( !empty($result) && $result !== array( array('readonlytext') ) ) {
2604                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2605                         # move any 'readonlytext' error manually.
2606                         $out = array();
2607                         foreach( $result as $error ) {
2608                                 if( $error != array( 'readonlytext' ) ) {
2609                                         $out []= $error;
2610                                 }
2611                         }
2612                         $wgOut->showPermissionsErrorPage( $out );
2613                         return;
2614                 }
2615                 if( $result == array( array('readonlytext') ) ) {
2616                         $wgOut->readOnlyPage();
2617                         return;
2618                 }
2619
2620                 $current = $details['current'];
2621                 $target = $details['target'];
2622                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2623                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2624                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2625                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2626                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2627                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2628                 $wgOut->addHtml( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2629                 $wgOut->returnToMain( false, $this->mTitle );
2630
2631                 if( !$wgRequest->getBool( 'hidediff', false ) ) {
2632                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), 'next', false, true );
2633                         $de->showDiff( '', '' );
2634                 }
2635         }
2636
2637
2638         /**
2639          * Do standard deferred updates after page view
2640          * @private
2641          */
2642         function viewUpdates() {
2643                 global $wgDeferredUpdateList, $wgUser;
2644
2645                 if ( 0 != $this->getID() ) {
2646                         # Don't update page view counters on views from bot users (bug 14044)
2647                         global $wgDisableCounters;
2648                         if( !$wgDisableCounters && !$wgUser->isAllowed( 'bot' ) ) {
2649                                 Article::incViewCount( $this->getID() );
2650                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2651                                 array_push( $wgDeferredUpdateList, $u );
2652                         }
2653                 }
2654
2655                 # Update newtalk / watchlist notification status
2656                 $wgUser->clearNotification( $this->mTitle );
2657         }
2658
2659         /**
2660          * Prepare text which is about to be saved.
2661          * Returns a stdclass with source, pst and output members
2662          */
2663         function prepareTextForEdit( $text, $revid=null ) {
2664                 if ( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2665                         // Already prepared
2666                         return $this->mPreparedEdit;
2667                 }
2668                 global $wgParser;
2669                 $edit = (object)array();
2670                 $edit->revid = $revid;
2671                 $edit->newText = $text;
2672                 $edit->pst = $this->preSaveTransform( $text );
2673                 $options = new ParserOptions;
2674                 $options->setTidy( true );
2675                 $options->enableLimitReport();
2676                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2677                 $edit->oldText = $this->getContent();
2678                 $this->mPreparedEdit = $edit;
2679                 return $edit;
2680         }
2681
2682         /**
2683          * Do standard deferred updates after page edit.
2684          * Update links tables, site stats, search index and message cache.
2685          * Every 100th edit, prune the recent changes table.
2686          *
2687          * @private
2688          * @param $text New text of the article
2689          * @param $summary Edit summary
2690          * @param $minoredit Minor edit
2691          * @param $timestamp_of_pagechange Timestamp associated with the page change
2692          * @param $newid rev_id value of the new revision
2693          * @param $changed Whether or not the content actually changed
2694          */
2695         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2696                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2697
2698                 wfProfileIn( __METHOD__ );
2699
2700                 # Parse the text
2701                 # Be careful not to double-PST: $text is usually already PST-ed once
2702                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2703                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2704                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2705                 } else {
2706                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2707                         $editInfo = $this->mPreparedEdit;
2708                 }
2709
2710                 # Save it to the parser cache
2711                 if ( $wgEnableParserCache ) {
2712                         $parserCache = ParserCache::singleton();
2713                         $parserCache->save( $editInfo->output, $this, $wgUser );
2714                 }
2715
2716                 # Update the links tables
2717                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2718                 $u->doUpdate();
2719
2720                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2721                         if ( 0 == mt_rand( 0, 99 ) ) {
2722                                 // Flush old entries from the `recentchanges` table; we do this on
2723                                 // random requests so as to avoid an increase in writes for no good reason
2724                                 global $wgRCMaxAge;
2725                                 $dbw = wfGetDB( DB_MASTER );
2726                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2727                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2728                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2729                                 $dbw->query( $sql );
2730                         }
2731                 }
2732
2733                 $id = $this->getID();
2734                 $title = $this->mTitle->getPrefixedDBkey();
2735                 $shortTitle = $this->mTitle->getDBkey();
2736
2737                 if ( 0 == $id ) {
2738                         wfProfileOut( __METHOD__ );
2739                         return;
2740                 }
2741
2742                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2743                 array_push( $wgDeferredUpdateList, $u );
2744                 $u = new SearchUpdate( $id, $title, $text );
2745                 array_push( $wgDeferredUpdateList, $u );
2746
2747                 # If this is another user's talk page, update newtalk
2748                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2749                 # load of user talk pages and piss people off, nor if it's a minor edit
2750                 # by a properly-flagged bot.
2751                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2752                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2753                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2754                                 $other = User::newFromName( $shortTitle );
2755                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2756                                         // An anonymous user
2757                                         $other = new User();
2758                                         $other->setName( $shortTitle );
2759                                 }
2760                                 if( $other ) {
2761                                         $other->setNewtalk( true );
2762                                 }
2763                         }
2764                 }
2765
2766                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2767                         $wgMessageCache->replace( $shortTitle, $text );
2768                 }
2769
2770                 wfProfileOut( __METHOD__ );
2771         }
2772
2773         /**
2774          * Perform article updates on a special page creation.
2775          *
2776          * @param Revision $rev
2777          *
2778          * @todo This is a shitty interface function. Kill it and replace the
2779          * other shitty functions like editUpdates and such so it's not needed
2780          * anymore.
2781          */
2782         function createUpdates( $rev ) {
2783                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2784                 $this->mTotalAdjustment = 1;
2785                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2786                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2787         }
2788
2789         /**
2790          * Generate the navigation links when browsing through an article revisions
2791          * It shows the information as:
2792          *   Revision as of \<date\>; view current revision
2793          *   \<- Previous version | Next Version -\>
2794          *
2795          * @private
2796          * @param string $oldid         Revision ID of this article revision
2797          */
2798         function setOldSubtitle( $oldid=0 ) {
2799                 global $wgLang, $wgOut, $wgUser;
2800
2801                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2802                                 return;
2803                 }
2804
2805                 $revision = Revision::newFromId( $oldid );
2806
2807                 $current = ( $oldid == $this->mLatest );
2808                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2809                 $sk = $wgUser->getSkin();
2810                 $lnk = $current
2811                         ? wfMsg( 'currentrevisionlink' )
2812                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2813                 $curdiff = $current
2814                         ? wfMsg( 'diff' )
2815                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2816                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2817                 $prevlink = $prev
2818                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2819                         : wfMsg( 'previousrevision' );
2820                 $prevdiff = $prev
2821                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2822                         : wfMsg( 'diff' );
2823                 $nextlink = $current
2824                         ? wfMsg( 'nextrevision' )
2825                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2826                 $nextdiff = $current
2827                         ? wfMsg( 'diff' )
2828                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2829
2830                 $cdel='';
2831                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
2832                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
2833                         if( $revision->isCurrent() ) {
2834                         // We don't handle top deleted edits too well
2835                                 $cdel = wfMsgHtml('rev-delundel');
2836                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
2837                         // If revision was hidden from sysops
2838                                 $cdel = wfMsgHtml('rev-delundel');
2839                         } else {
2840                                 $cdel = $sk->makeKnownLinkObj( $revdel,
2841                                         wfMsgHtml('rev-delundel'),
2842                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
2843                                         '&oldid=' . urlencode( $oldid ) );
2844                                 // Bolden oversighted content
2845                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
2846                                         $cdel = "<strong>$cdel</strong>";
2847                         }
2848                         $cdel = "(<small>$cdel</small>) ";
2849                 }
2850                 # Show user links if allowed to see them. Normally they
2851                 # are hidden regardless, but since we can already see the text here...
2852                 $userlinks = $sk->revUserTools( $revision, false );
2853
2854                 $m = wfMsg( 'revision-info-current' );
2855                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2856                         ? 'revision-info-current'
2857                         : 'revision-info';
2858
2859                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2860
2861                      "\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";
2862                 $wgOut->setSubtitle( $r );
2863         }
2864
2865         /**
2866          * This function is called right before saving the wikitext,
2867          * so we can do things like signatures and links-in-context.
2868          *
2869          * @param string $text
2870          */
2871         function preSaveTransform( $text ) {
2872                 global $wgParser, $wgUser;
2873                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2874         }
2875
2876         /* Caching functions */
2877
2878         /**
2879          * checkLastModified returns true if it has taken care of all
2880          * output to the client that is necessary for this request.
2881          * (that is, it has sent a cached version of the page)
2882          */
2883         function tryFileCache() {
2884                 static $called = false;
2885                 if( $called ) {
2886                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2887                         return;
2888                 }
2889                 $called = true;
2890                 if($this->isFileCacheable()) {
2891                         $touched = $this->mTouched;
2892                         $cache = new HTMLFileCache( $this->mTitle );
2893                         if($cache->isFileCacheGood( $touched )) {
2894                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2895                                 $cache->loadFromFileCache();
2896                                 return true;
2897                         } else {
2898                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2899                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2900                         }
2901                 } else {
2902                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2903                 }
2904         }
2905
2906         /**
2907          * Check if the page can be cached
2908          * @return bool
2909          */
2910         function isFileCacheable() {
2911                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2912                 $action    = $wgRequest->getVal( 'action'    );
2913                 $oldid     = $wgRequest->getVal( 'oldid'     );
2914                 $diff      = $wgRequest->getVal( 'diff'      );
2915                 $redirect  = $wgRequest->getVal( 'redirect'  );
2916                 $printable = $wgRequest->getVal( 'printable' );
2917                 $page      = $wgRequest->getVal( 'page' );
2918
2919                 //check for non-standard user language; this covers uselang,
2920                 //and extensions for auto-detecting user language.
2921                 $ulang     = $wgLang->getCode();
2922                 $clang     = $wgContLang->getCode();
2923
2924                 $cacheable = $wgUseFileCache
2925                         && (!$wgShowIPinHeader)
2926                         && ($this->getID() != 0)
2927                         && ($wgUser->isAnon())
2928                         && (!$wgUser->getNewtalk())
2929                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2930                         && (empty( $action ) || $action == 'view')
2931                         && (!isset($oldid))
2932                         && (!isset($diff))
2933                         && (!isset($redirect))
2934                         && (!isset($printable))
2935                         && !isset($page)
2936                         && (!$this->mRedirectedFrom)
2937                         && ($ulang === $clang);
2938
2939                 if ( $cacheable ) {
2940                         //extension may have reason to disable file caching on some pages.
2941                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2942                 }
2943
2944                 return $cacheable;
2945         }
2946
2947         /**
2948          * Loads page_touched and returns a value indicating if it should be used
2949          *
2950          */
2951         function checkTouched() {
2952                 if( !$this->mDataLoaded ) {
2953                         $this->loadPageData();
2954                 }
2955                 return !$this->mIsRedirect;
2956         }
2957
2958         /**
2959          * Get the page_touched field
2960          */
2961         function getTouched() {
2962                 # Ensure that page data has been loaded
2963                 if( !$this->mDataLoaded ) {
2964                         $this->loadPageData();
2965                 }
2966                 return $this->mTouched;
2967         }
2968
2969         /**
2970          * Get the page_latest field
2971          */
2972         function getLatest() {
2973                 if ( !$this->mDataLoaded ) {
2974                         $this->loadPageData();
2975                 }
2976                 return $this->mLatest;
2977         }
2978
2979         /**
2980          * Edit an article without doing all that other stuff
2981          * The article must already exist; link tables etc
2982          * are not updated, caches are not flushed.
2983          *
2984          * @param string $text text submitted
2985          * @param string $comment comment submitted
2986          * @param bool $minor whereas it's a minor modification
2987          */
2988         function quickEdit( $text, $comment = '', $minor = 0 ) {
2989                 wfProfileIn( __METHOD__ );
2990
2991                 $dbw = wfGetDB( DB_MASTER );
2992                 $dbw->begin();
2993                 $revision = new Revision( array(
2994                         'page'       => $this->getId(),
2995                         'text'       => $text,
2996                         'comment'    => $comment,
2997                         'minor_edit' => $minor ? 1 : 0,
2998                         ) );
2999                 $revision->insertOn( $dbw );
3000                 $this->updateRevisionOn( $dbw, $revision );
3001                 $dbw->commit();
3002
3003                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false) );
3004
3005                 wfProfileOut( __METHOD__ );
3006         }
3007
3008         /**
3009          * Used to increment the view counter
3010          *
3011          * @static
3012          * @param integer $id article id
3013          */
3014         function incViewCount( $id ) {
3015                 $id = intval( $id );
3016                 global $wgHitcounterUpdateFreq, $wgDBtype;
3017
3018                 $dbw = wfGetDB( DB_MASTER );
3019                 $pageTable = $dbw->tableName( 'page' );
3020                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3021                 $acchitsTable = $dbw->tableName( 'acchits' );
3022
3023                 if( $wgHitcounterUpdateFreq <= 1 ) {
3024                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3025                         return;
3026                 }
3027
3028                 # Not important enough to warrant an error page in case of failure
3029                 $oldignore = $dbw->ignoreErrors( true );
3030
3031                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3032
3033                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3034                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3035                         # Most of the time (or on SQL errors), skip row count check
3036                         $dbw->ignoreErrors( $oldignore );
3037                         return;
3038                 }
3039
3040                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3041                 $row = $dbw->fetchObject( $res );
3042                 $rown = intval( $row->n );
3043                 if( $rown >= $wgHitcounterUpdateFreq ){
3044                         wfProfileIn( 'Article::incViewCount-collect' );
3045                         $old_user_abort = ignore_user_abort( true );
3046
3047                         if ($wgDBtype == 'mysql')
3048                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3049                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3050                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3051                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3052                                 'GROUP BY hc_id');
3053                         $dbw->query("DELETE FROM $hitcounterTable");
3054                         if ($wgDBtype == 'mysql') {
3055                                 $dbw->query('UNLOCK TABLES');
3056                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3057                                         'WHERE page_id = hc_id');
3058                         }
3059                         else {
3060                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3061                                         "FROM $acchitsTable WHERE page_id = hc_id");
3062                         }
3063                         $dbw->query("DROP TABLE $acchitsTable");
3064
3065                         ignore_user_abort( $old_user_abort );
3066                         wfProfileOut( 'Article::incViewCount-collect' );
3067                 }
3068                 $dbw->ignoreErrors( $oldignore );
3069         }
3070
3071         /**#@+
3072          * The onArticle*() functions are supposed to be a kind of hooks
3073          * which should be called whenever any of the specified actions
3074          * are done.
3075          *
3076          * This is a good place to put code to clear caches, for instance.
3077          *
3078          * This is called on page move and undelete, as well as edit
3079          * @static
3080          * @param $title_obj a title object
3081          */
3082
3083         static function onArticleCreate($title) {
3084                 # The talk page isn't in the regular link tables, so we need to update manually:
3085                 if ( $title->isTalkPage() ) {
3086                         $other = $title->getSubjectPage();
3087                 } else {
3088                         $other = $title->getTalkPage();
3089                 }
3090                 $other->invalidateCache();
3091                 $other->purgeSquid();
3092
3093                 $title->touchLinks();
3094                 $title->purgeSquid();
3095                 $title->deleteTitleProtection();
3096         }
3097
3098         static function onArticleDelete( $title ) {
3099                 global $wgUseFileCache, $wgMessageCache;
3100
3101                 // Update existence markers on article/talk tabs...
3102                 if( $title->isTalkPage() ) {
3103                         $other = $title->getSubjectPage();
3104                 } else {
3105                         $other = $title->getTalkPage();
3106                 }
3107                 $other->invalidateCache();
3108                 $other->purgeSquid();
3109
3110                 $title->touchLinks();
3111                 $title->purgeSquid();
3112
3113                 # File cache
3114                 if ( $wgUseFileCache ) {
3115                         $cm = new HTMLFileCache( $title );
3116                         @unlink( $cm->fileCacheName() );
3117                 }
3118
3119                 # Messages
3120                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3121                         $wgMessageCache->replace( $title->getDBkey(), false );
3122                 }
3123                 # Images
3124                 if( $title->getNamespace() == NS_IMAGE ) {
3125                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3126                         $update->doUpdate();
3127                 }
3128                 # User talk pages
3129                 if( $title->getNamespace() == NS_USER_TALK ) {
3130                         $user = User::newFromName( $title->getText(), false );
3131                         $user->setNewtalk( false );
3132                 }
3133         }
3134
3135         /**
3136          * Purge caches on page update etc
3137          */
3138         static function onArticleEdit( $title ) {
3139                 global $wgDeferredUpdateList, $wgUseFileCache;
3140
3141                 // Invalidate caches of articles which include this page
3142                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3143
3144                 // Invalidate the caches of all pages which redirect here
3145                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3146
3147                 # Purge squid for this page only
3148                 $title->purgeSquid();
3149
3150                 # Clear file cache
3151                 if ( $wgUseFileCache ) {
3152                         $cm = new HTMLFileCache( $title );
3153                         @unlink( $cm->fileCacheName() );
3154                 }
3155         }
3156
3157         /**#@-*/
3158
3159         /**
3160          * Overriden by ImagePage class, only present here to avoid a fatal error
3161          * Called for ?action=revert
3162          */
3163         public function revert(){
3164                 global $wgOut;
3165                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3166         }
3167
3168         /**
3169          * Info about this page
3170          * Called for ?action=info when $wgAllowPageInfo is on.
3171          *
3172          * @public
3173          */
3174         function info() {
3175                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3176
3177                 if ( !$wgAllowPageInfo ) {
3178                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3179                         return;
3180                 }
3181
3182                 $page = $this->mTitle->getSubjectPage();
3183
3184                 $wgOut->setPagetitle( $page->getPrefixedText() );
3185                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3186                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ) );
3187
3188                 if( !$this->mTitle->exists() ) {
3189                         $wgOut->addHtml( '<div class="noarticletext">' );
3190                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3191                                 // This doesn't quite make sense; the user is asking for
3192                                 // information about the _page_, not the message... -- RC
3193                                 $wgOut->addHtml( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3194                         } else {
3195                                 $msg = $wgUser->isLoggedIn()
3196                                         ? 'noarticletext'
3197                                         : 'noarticletextanon';
3198                                 $wgOut->addHtml( wfMsgExt( $msg, 'parse' ) );
3199                         }
3200                         $wgOut->addHtml( '</div>' );
3201                 } else {
3202                         $dbr = wfGetDB( DB_SLAVE );
3203                         $wl_clause = array(
3204                                 'wl_title'     => $page->getDBkey(),
3205                                 'wl_namespace' => $page->getNamespace() );
3206                         $numwatchers = $dbr->selectField(
3207                                 'watchlist',
3208                                 'COUNT(*)',
3209                                 $wl_clause,
3210                                 __METHOD__,
3211                                 $this->getSelectOptions() );
3212
3213                         $pageInfo = $this->pageCountInfo( $page );
3214                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3215
3216                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3217                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3218                         if( $talkInfo ) {
3219                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3220                         }
3221                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3222                         if( $talkInfo ) {
3223                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3224                         }
3225                         $wgOut->addHTML( '</ul>' );
3226
3227                 }
3228         }
3229
3230         /**
3231          * Return the total number of edits and number of unique editors
3232          * on a given page. If page does not exist, returns false.
3233          *
3234          * @param Title $title
3235          * @return array
3236          * @private
3237          */
3238         function pageCountInfo( $title ) {
3239                 $id = $title->getArticleId();
3240                 if( $id == 0 ) {
3241                         return false;
3242                 }
3243
3244                 $dbr = wfGetDB( DB_SLAVE );
3245
3246                 $rev_clause = array( 'rev_page' => $id );
3247
3248                 $edits = $dbr->selectField(
3249                         'revision',
3250                         'COUNT(rev_page)',
3251                         $rev_clause,
3252                         __METHOD__,
3253                         $this->getSelectOptions() );
3254
3255                 $authors = $dbr->selectField(
3256                         'revision',
3257                         'COUNT(DISTINCT rev_user_text)',
3258                         $rev_clause,
3259                         __METHOD__,
3260                         $this->getSelectOptions() );
3261
3262                 return array( 'edits' => $edits, 'authors' => $authors );
3263         }
3264
3265         /**
3266          * Return a list of templates used by this article.
3267          * Uses the templatelinks table
3268          *
3269          * @return array Array of Title objects
3270          */
3271         function getUsedTemplates() {
3272                 $result = array();
3273                 $id = $this->mTitle->getArticleID();
3274                 if( $id == 0 ) {
3275                         return array();
3276                 }
3277
3278                 $dbr = wfGetDB( DB_SLAVE );
3279                 $res = $dbr->select( array( 'templatelinks' ),
3280                         array( 'tl_namespace', 'tl_title' ),
3281                         array( 'tl_from' => $id ),
3282                         'Article:getUsedTemplates' );
3283                 if ( false !== $res ) {
3284                         if ( $dbr->numRows( $res ) ) {
3285                                 while ( $row = $dbr->fetchObject( $res ) ) {
3286                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3287                                 }
3288                         }
3289                 }
3290                 $dbr->freeResult( $res );
3291                 return $result;
3292         }
3293
3294         /**
3295          * Returns a list of hidden categories this page is a member of.
3296          * Uses the page_props and categorylinks tables.
3297          *
3298          * @return array Array of Title objects
3299          */
3300         function getHiddenCategories() {
3301                 $result = array();
3302                 $id = $this->mTitle->getArticleID();
3303                 if( $id == 0 ) {
3304                         return array();
3305                 }
3306
3307                 $dbr = wfGetDB( DB_SLAVE );
3308                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3309                         array( 'cl_to' ),
3310                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3311                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3312                         'Article:getHiddenCategories' );
3313                 if ( false !== $res ) {
3314                         if ( $dbr->numRows( $res ) ) {
3315                                 while ( $row = $dbr->fetchObject( $res ) ) {
3316                                         $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3317                                 }
3318                         }
3319                 }
3320                 $dbr->freeResult( $res );
3321                 return $result;
3322         }
3323
3324         /**
3325         * Return an applicable autosummary if one exists for the given edit.
3326         * @param string $oldtext The previous text of the page.
3327         * @param string $newtext The submitted text of the page.
3328         * @param bitmask $flags A bitmask of flags submitted for the edit.
3329         * @return string An appropriate autosummary, or an empty string.
3330         */
3331         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3332                 # Decide what kind of autosummary is needed.
3333
3334                 # Redirect autosummaries
3335                 $rt = Title::newFromRedirect( $newtext );
3336                 if( is_object( $rt ) ) {
3337                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3338                 }
3339
3340                 # New page autosummaries
3341                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3342                         # If they're making a new article, give its text, truncated, in the summary.
3343                         global $wgContLang;
3344                         $truncatedtext = $wgContLang->truncate(
3345                                 str_replace("\n", ' ', $newtext),
3346                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
3347                                 '...' );
3348                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3349                 }
3350
3351                 # Blanking autosummaries
3352                 if( $oldtext != '' && $newtext == '' ) {
3353                         return wfMsgForContent('autosumm-blank');
3354                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3355                         # Removing more than 90% of the article
3356                         global $wgContLang;
3357                         $truncatedtext = $wgContLang->truncate(
3358                                 $newtext,
3359                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ),
3360                                 '...'
3361                         );
3362                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3363                 }
3364
3365                 # If we reach this point, there's no applicable autosummary for our case, so our
3366                 # autosummary is empty.
3367                 return '';
3368         }
3369
3370         /**
3371          * Add the primary page-view wikitext to the output buffer
3372          * Saves the text into the parser cache if possible.
3373          * Updates templatelinks if it is out of date.
3374          *
3375          * @param string  $text
3376          * @param bool    $cache
3377          */
3378         public function outputWikiText( $text, $cache = true ) {
3379                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache;
3380
3381                 $popts = $wgOut->parserOptions();
3382                 $popts->setTidy(true);
3383                 $popts->enableLimitReport();
3384                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3385                         $popts, true, true, $this->getRevIdFetched() );
3386                 $popts->setTidy(false);
3387                 $popts->enableLimitReport( false );
3388                 if ( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3389                         $parserCache = ParserCache::singleton();
3390                         $parserCache->save( $parserOutput, $this, $wgUser );
3391                 }
3392
3393                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3394                         // templatelinks table may have become out of sync,
3395                         // especially if using variable-based transclusions.
3396                         // For paranoia, check if things have changed and if
3397                         // so apply updates to the database. This will ensure
3398                         // that cascaded protections apply as soon as the changes
3399                         // are visible.
3400
3401                         # Get templates from templatelinks
3402                         $id = $this->mTitle->getArticleID();
3403
3404                         $tlTemplates = array();
3405
3406                         $dbr = wfGetDB( DB_SLAVE );
3407                         $res = $dbr->select( array( 'templatelinks' ),
3408                                 array( 'tl_namespace', 'tl_title' ),
3409                                 array( 'tl_from' => $id ),
3410                                 'Article:getUsedTemplates' );
3411
3412                         global $wgContLang;
3413
3414                         if ( false !== $res ) {
3415                                 if ( $dbr->numRows( $res ) ) {
3416                                         while ( $row = $dbr->fetchObject( $res ) ) {
3417                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
3418                                         }
3419                                 }
3420                         }
3421
3422                         # Get templates from parser output.
3423                         $poTemplates_allns = $parserOutput->getTemplates();
3424
3425                         $poTemplates = array ();
3426                         foreach ( $poTemplates_allns as $ns_templates ) {
3427                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
3428                         }
3429
3430                         # Get the diff
3431                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
3432
3433                         if ( count( $templates_diff ) > 0 ) {
3434                                 # Whee, link updates time.
3435                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
3436
3437                                 $dbw = wfGetDb( DB_MASTER );
3438                                 $dbw->begin();
3439
3440                                 $u->doUpdate();
3441
3442                                 $dbw->commit();
3443                         }
3444                 }
3445
3446                 $wgOut->addParserOutput( $parserOutput );
3447         }
3448
3449         /**
3450          * Update all the appropriate counts in the category table, given that
3451          * we've added the categories $added and deleted the categories $deleted.
3452          *
3453          * @param $added array   The names of categories that were added
3454          * @param $deleted array The names of categories that were deleted
3455          * @return null
3456          */
3457         public function updateCategoryCounts( $added, $deleted ) {
3458                 $ns = $this->mTitle->getNamespace();
3459                 $dbw = wfGetDB( DB_MASTER );
3460
3461                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3462                 # exist, we might legitimately not create it, but it's simpler to just
3463                 # create it and then give it a negative value, since the value is bogus
3464                 # anyway.
3465                 #
3466                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3467                 $insertCats = array_merge( $added, $deleted );
3468                 if( !$insertCats ) {
3469                         # Okay, nothing to do
3470                         return;
3471                 }
3472                 $insertRows = array();
3473                 foreach( $insertCats as $cat ) {
3474                         $insertRows[] = array( 'cat_title' => $cat );
3475                 }
3476                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3477
3478                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3479                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3480                 if( $ns == NS_CATEGORY ) {
3481                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3482                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3483                 } elseif( $ns == NS_IMAGE ) {
3484                         $addFields[]    = 'cat_files = cat_files + 1';
3485                         $removeFields[] = 'cat_files = cat_files - 1';
3486                 }
3487
3488                 if ( $added ) {
3489                         $dbw->update(
3490                                 'category',
3491                                 $addFields,
3492                                 array( 'cat_title' => $added ),
3493                                 __METHOD__
3494                         );
3495                 }
3496                 if ( $deleted ) {
3497                         $dbw->update(
3498                                 'category',
3499                                 $removeFields,
3500                                 array( 'cat_title' => $deleted ),
3501                                 __METHOD__
3502                         );
3503                 }
3504         }
3505 }